proper modelica text model editing

Mouse wheel zooms in and out around the cursor.
Left-click dragging pans the graph.
Matplotlib toolbar modes still work and take precedence when activated.
The existing Home button can reset the view.

BEdit/.vscode/tasks.json

@@ -6,7 +6,6 @@
             "type": "shell",
             "command": "pyside6-designer",
             "args": [
-                "${workspaceFolder}/ui/*.ui"
             ],
             "options": {
                 "cwd": "${workspaceFolder}",
@@ -116,6 +115,14 @@
             "options": {"cwd": "${workspaceFolder}"},
             "problemMatcher": []
         },
+        {
+            "label": "Qt: Compile Simulation Window UI to Python",
+            "type": "shell",
+            "command": "pyside6-uic",
+            "args": ["--from-imports", "${workspaceFolder}/ui/simulation_window.ui", "-o", "${workspaceFolder}/src/bedit/gui/generated/ui_simulation_window.py"],
+            "options": {"cwd": "${workspaceFolder}"},
+            "problemMatcher": []
+        },
         {
             "label": "Qt: Build Designer Files",
             "dependsOrder": "sequence",
@@ -126,7 +133,8 @@
                 "Qt: Compile Component Options UI to Python",
                 "Qt: Compile Port Options UI to Python",
                 "Qt: Compile Shape Options UI to Python",
-                "Qt: Compile Icon Editor UI to Python"
+                "Qt: Compile Icon Editor UI to Python",
+                "Qt: Compile Simulation Window UI to Python"
             ],
             "problemMatcher": [],
             "group": {

BEdit/AGENTS.md

@@ -25,7 +25,7 @@ src/bedit/
 │   ├── port_types.py       # Port type definitions and compatibility
 │   ├── serializer.py       # JSON persistence
 │   ├── libraries.py        # Library file discovery and parsing
-│   └── simulation/         # Qt-free simulation service and compiler/runtime code
+│   └── simulation/         # Qt-free composition and OpenModelica interface code
 └── gui/                    # All Qt-dependent code
     ├── app.py              # QApplication startup and palette
     ├── main_window.py      # Top-level UI orchestration
@@ -94,27 +94,76 @@ Keep the root of `src/bedit` minimal. New UI modules should go into the relevant
 - Avoid the QSettings group name `general`; Qt treats `General` specially in INI
   files. Autosave keys live under `autosave/`.
 - User-visible document edits should participate in undo/redo.
+- Component clipboard data is shared by the graph, document tree, and library
+  tree. Pasting into the document node creates roots; pasting into a graph node
+  creates children at an origin-normalized position. Always clone pasted trees
+  with fresh IDs, preserve connections between jointly copied graph blocks, and
+  assign unique sibling names.
 - The text-definition editor uses OpenModelica highlighting and completion from
   `src/bedit/data/syntax/openmodelica.json`. Keep keywords, types, built-ins, and
   named BEdit `$name$` macro completions editable there; arbitrary `$name$`
   expressions are highlighted as BEvalues. Highlight colors and bold/italic
   styles are persisted under `syntax/<category>/` in application settings.
+- Text component sources may contain private Modelica declarations in
+  `source.declarations`. The text-definition editor exposes declarations above
+  `source.initialEquations` and `source.equations`, with the same highlighting
+  and completion in all three fields. The composer emits each in its matching
+  Modelica section.
 - Application-wide messages use `core.application_log.get_logger()`. The main
   window installs the Qt log-panel handler; core code must only use standard
   Python logging and must not import the GUI handler.
 - File → Reload Simulation Code (`Ctrl+F5`) reloads modules under
   `bedit.core.simulation`, replaces the shared application/controller service,
   and preserves the previous instance attributes where possible.
-- Simulation compilation lives in `core/simulation/compiler.py`; the simulation
-  service only owns application state and delegates compilation. Ports with
+- Modelica composition lives in `core/simulation/composer.py`; the simulation
+  service only owns application state and delegates composition. Ports with
   `multipleConnections` are emitted as Modelica arrays. Their size is inferred
   per component instance from graph connections and exposed while compiling as
   `$portname_N$`; array connection endpoints receive stable one-based indices in
   graph connection order.
-- Blocking simulator integration belongs in `core/simulation/runner.py` and runs
-  on its daemon worker thread. Never perform OMPython startup or simulation work
-  directly on the Qt GUI thread; background failures must go to the application
-  log.
+- Simulation → Export Model composes through `Simulation.compose_source()` without
+  building the model, then writes the generated source as a `.mo` file.
+- OpenModelica integration belongs in `core/simulation/openmodelica.py`. Its
+  persistent worker and OMC session start lazily on the first queued request.
+  Never perform OMPython work directly on the Qt GUI thread. Result and error
+  callbacks run on background threads and must use a Qt signal before touching UI.
+  One lazy temporary working directory is shared by all requests in the session.
+  Explicit application shutdown closes OMC and removes that directory plus the
+  current session's OMPython log and port files; `__del__` is only a fallback.
+- Simulation runs start an ephemeral localhost TCP listener before launching the
+  generated model through OMC's `system()` function. OpenModelica's newline-delimited
+  `xmltcp` status and message records are parsed in the core and forwarded through
+  callbacks; the simulation service retains the latest progress for polling.
+- The application owns one reusable `SimulationWindow`. Starting a run clears its
+  progress, log, and future result views. Extend graph presentation through its
+  Designer-owned `resultsLayout` and the
+  `clear_result_views()`/`load_result_views()` hooks.
+- Simulation-window geometry, dock/toolbar state, and central-results visibility
+  persist under `simulationWindow/` through `application_settings()`.
+- Standalone simulation results are modeled in `core/simulation/results.py`.
+  Its versioned schema retains model status, messages, metadata, and plottable
+  traces so the simulation window can open results without an active document.
+  Human-readable `.json` uses JSON, while the default `.ber` format uses the same
+  compressed MessagePack approach as `.beb` documents.
+- After a successful OpenModelica run, `<model>_res.csv` is parsed on the worker
+  before temporary-directory cleanup. `SimulationResults.data` stores every CSV
+  column as a numeric array, including `time`, for later plotting and persistence.
+- The simulation window's dockable Signals tree derives hierarchy from dot-separated
+  result-column names and bracketed array indices (`a[1]` becomes `a → 1`). Leaf
+  items retain the exact full column name in `UserRole`; plotting code should
+  consume `SimulationWindow.selected_signal_names()`.
+- Simulation graph tabs persist as `SimulationResults.graphs`; every graph has a
+  stable ID, editable title, and its own `traces` list. Runtime graph widgets belong
+  in `GraphWorkspacePage.plot_layout`, not in the serialized core model. The
+  Signals tree checkboxes edit the active graph's traces, and each page embeds a
+  Matplotlib QtAgg canvas. Each graph persists its own `x_axis` signal (default
+  `time`), selectable from the Signals tree context menu.
+- Embedded Matplotlib canvases provide cursor-centered wheel zoom and direct
+  left-button drag panning without activating navigation-toolbar modes. Their
+  custom navigation toolbar restores an explicit data-derived home view.
+- Rerunning the same composed model retains graph tabs, ordering, titles, X axes,
+  and surviving trace settings while replacing numeric data. Missing signals are
+  pruned from traces/X-axis selection and newly returned columns appear in the tree.
 - The optional OpenModelica executable is persisted as
   `simulation/openModelicaPath`. The GUI passes it into `Simulation`; core must
   not read `QSettings`. An empty path uses OMPython/PATH discovery, while an
@@ -159,6 +208,9 @@ pyside6-uic --from-imports ui/text_definition_editor.ui \
 pyside6-uic --from-imports ui/simulation_settings_dialog.ui \
   -o src/bedit/gui/generated/ui_simulation_settings_dialog.py
 
+pyside6-uic --from-imports ui/simulation_window.ui \
+  -o src/bedit/gui/generated/ui_simulation_window.py
+
 pyside6-uic --from-imports ui/graph_parameters_dialog.ui \
   -o src/bedit/gui/generated/ui_graph_parameters_dialog.py
 

BEdit/pyproject.toml

@@ -9,6 +9,7 @@ description = "A starter Qt desktop application"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
+    "matplotlib>=3.8,<4",
     "msgpack>=1.0,<2",
     "PySide6>=6.7,<7",
     "OMPython>4.0",

BEdit/resources/resources.qrc

@@ -1,5 +1,9 @@
 <RCC>
   <qresource prefix="icons">
+    <file>icons/list-remove.png</file>
+    <file>icons/list-add.png</file>
+    <file>icons/view-form-table.png</file>
+    <file>icons/office-chart-line.png</file>
     <file>icons/run-build.png</file>
     <file>icons/preferences-system.png</file>
     <file>icons/draw-triangle.png</file>

BEdit/resources/resources_rc.py

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+\x00\x00\x02B\x00\x00\x00\x00\x00\x01\x00\x00Vu\
 \x00\x00\x01\x9f{C\xf1=\
 \x00\x00\x006\x00\x00\x00\x00\x00\x01\x00\x00\x05\x86\
 \x00\x00\x01\x9f\x7f&\x83\x99\
-\x00\x00\x03\xf4\x00\x00\x00\x00\x00\x01\x00\x00\x94\x80\
+\x00\x00\x04\x92\x00\x00\x00\x00\x00\x01\x00\x00\xa3\xa2\
 \x00\x00\x01\x9f{{\xa5\xe3\
 \x00\x00\x00^\x00\x00\x00\x00\x00\x01\x00\x00\x0c\xc1\
 \x00\x00\x01\x9f\x7f\xac\xf2\xc6\
 \x00\x00\x01D\x00\x00\x00\x00\x00\x01\x00\x00/{\
 \x00\x00\x01\x9f\x7fV\xd5\xe5\
-\x00\x00\x03|\x00\x00\x00\x00\x00\x01\x00\x00\x88\xb7\
+\x00\x00\x03\xa0\x00\x00\x00\x00\x00\x01\x00\x00\x8c\xe4\
 \x00\x00\x01\x9f{0\xc9R\
 "
 

BEdit/src/bedit/core/model.py

@@ -344,11 +344,19 @@ class Component:
         if kind == "text":
             raw_source = implementation.get("source", {})
             equations = raw_source.get("equations", "")
+            declarations = raw_source.get("declarations", "")
+            initial_equations = raw_source.get("initialEquations", "")
             parameters = data.get("parameters", raw_source.get("parameters", []))
             if not isinstance(equations, str):
                 raise ValueError("Text component equations must be a string")
+            if not isinstance(declarations, str):
+                raise ValueError("Text component declarations must be a string")
+            if not isinstance(initial_equations, str):
+                raise ValueError("Text component initial equations must be a string")
             source = {
                 "equations": equations,
+                "declarations": declarations,
+                "initialEquations": initial_equations,
             }
         if not isinstance(parameters, list):
             raise ValueError("Component parameters must be a list")

BEdit/src/bedit/core/simulation/__init__.py

@@ -1,3 +1,23 @@
 from bedit.core.simulation.service import Simulation
+from bedit.core.simulation.openmodelica import OpenModelicaInterface
+from bedit.core.simulation.results import (
+    BerSimulationResultsSerializer,
+    JsonSimulationResultsSerializer,
+    SimulationExecutionResult,
+    SimulationGraph,
+    SimulationResults,
+    SimulationResultsSerializer,
+    SimulationTrace,
+)
 
-__all__ = ["Simulation"]
+__all__ = [
+    "OpenModelicaInterface",
+    "Simulation",
+    "SimulationResults",
+    "SimulationExecutionResult",
+    "SimulationGraph",
+    "SimulationResultsSerializer",
+    "SimulationTrace",
+    "BerSimulationResultsSerializer",
+    "JsonSimulationResultsSerializer",
+]

BEdit/src/bedit/core/simulation/composer.py

@@ -14,8 +14,8 @@ _BEVALUE_PATTERN = re.compile(r"\$([A-Za-z_][A-Za-z0-9_]*)\$")
 
 
 @dataclass(frozen=True)
-class CompilationResult:
-    """The intermediate data and generated source produced by compilation."""
+class CompositionResult:
+    """The intermediate data and generated source produced by composition."""
 
     graph: dict[str, Any]
     objects_by_id: dict[str, Any]
@@ -23,16 +23,16 @@ class CompilationResult:
     model_name: str
 
 
-def compile_graph(graph: dict[str, Any]) -> CompilationResult:
-    """Clean, index, and emit a serialized component tree."""
+def compose_graph(graph: dict[str, Any]) -> CompositionResult:
+    """Clean, index, and compose a serialized component tree."""
 
     cleaned_graph = cleanup_graph(deepcopy(graph))
     objects_by_id = build_id_list(cleaned_graph)
-    return CompilationResult(
+    return CompositionResult(
         graph=cleaned_graph,
         objects_by_id=objects_by_id,
         modelica=emit_model(cleaned_graph, objects_by_id),
-        model_name=model_name_for(cleaned_graph)
+        model_name=model_name_for(cleaned_graph),
     )
 
 
@@ -85,7 +85,7 @@ def emit_model(
 ) -> str:
     """Emit a component and its nested definitions as Modelica source."""
 
-    del id_list  # Kept in the public API for compiler extensions and inspection.
+    del id_list  # Kept in the public API for composer extensions and inspection.
     indentation = "\t" * indent
     body_indent = "\t" * (indent + 1)
     model_name = model_name_for(graph)
@@ -123,6 +123,14 @@ def emit_model(
             f"{body_indent}parameter {parameter_type} {parameter_name} = {value};"
         )
 
+    if implementation_kind == "text":
+        declarations = str(implementation.get("source", {}).get("declarations", ""))
+        declarations = expand_bevalues(declarations, macros)
+        lines.extend(
+            f"{body_indent}{line}" if line.strip() else ""
+            for line in declarations.splitlines()
+        )
+
     if implementation_kind == "graph":
         for block in nested_graph.get("blocks", []):
             block_type = model_name_for(block)
@@ -134,8 +142,9 @@ def emit_model(
                 f"{body_indent}{junction_type} {_junction_name(junction['id'])};"
             )
 
-    lines.append(f"{indentation}equation")
     if implementation_kind == "graph":
+        lines.append(f"{indentation}equation")
+
         blocks = {block["id"]: block for block in nested_graph.get("blocks", [])}
         junctions = {
             junction["id"]: junction for junction in nested_graph.get("junctions", [])
@@ -151,8 +160,21 @@ def emit_model(
             # Connector types may require different equations in future.
             lines.append(f"{body_indent}{target} = {source};")
     else:
+        initial_equations = str(
+            implementation.get("source", {}).get("initialEquations", "")
+        )
+        initial_equations = expand_bevalues(initial_equations, macros)
         equations = str(implementation.get("source", {}).get("equations", ""))
         equations = expand_bevalues(equations, macros)
+
+        if initial_equations.strip():
+            lines.append(f"{indentation}initial equation")
+            lines.extend(
+                f"{body_indent}{line}" if line.strip() else ""
+                for line in initial_equations.splitlines()
+            )
+
+        lines.append(f"{indentation}equation")
         lines.extend(
             f"{body_indent}{line}" if line.strip() else ""
             for line in equations.splitlines()
@@ -161,7 +183,6 @@ def emit_model(
     lines.append(f"{indentation}end {model_name};")
     return "\n".join(lines) + "\n"
 
-
 def cleanup_graph(graph: dict[str, Any]) -> dict[str, Any]:
     """Remove annotations and UI-only data from a serialized component tree."""
 
@@ -283,7 +304,7 @@ def _port_count_macros(
 
 
 def expand_bevalues(text: str, values: dict[str, str]) -> str:
-    """Replace BEdit ``$name$`` macros and reject unresolved compiler values."""
+    """Replace BEdit ``$name$`` macros and reject unresolved composer values."""
 
     def replace(match: re.Match[str]) -> str:
         name = match.group(1)

BEdit/src/bedit/core/simulation/openmodelica.py

@@ -0,0 +1,427 @@
+import json
+import os
+import shlex
+import shutil
+import socket
+import tempfile
+import time
+import xml.etree.ElementTree as ET
+from collections.abc import Callable
+from dataclasses import dataclass
+from pathlib import Path
+from queue import Queue
+from threading import Event, Lock, Thread, current_thread
+from typing import Any
+
+from bedit.core.application_log import get_logger
+from bedit.core.simulation.results import (
+    SimulationExecutionResult,
+    load_openmodelica_csv,
+)
+
+
+log = get_logger(__name__)
+ResultCallback = Callable[[Any], None]
+ErrorCallback = Callable[[Exception], None]
+
+
+@dataclass(frozen=True)
+class _Request:
+    description: str
+    operation: Callable[[Any, Path], Any]
+    callback: ResultCallback | None
+    error_callback: ErrorCallback | None
+
+
+@dataclass(frozen=True)
+class SimulationProgress:
+    phase: str
+    current_step_size: float
+    time: float
+    progress: int
+
+
+@dataclass(frozen=True)
+class SimulationMessage:
+    stream: str
+    type: str
+    text: str
+
+
+class OpenModelicaInterface:
+    """Asynchronous, persistent interface to one OpenModelica session.
+
+    The worker and OMC session are created lazily for the first request. Callbacks
+    execute on background threads and must not manipulate Qt widgets directly.
+    """
+
+    def __init__(self, executable_path: str = "") -> None:
+        self._executable_path = executable_path
+        self._lifecycle_lock = Lock()
+        self._queue: Queue[_Request | None] | None = None
+        self._worker: Thread | None = None
+        self._temp_dir: Path | None = None
+
+    @property
+    def executable_path(self) -> str:
+        return self._executable_path
+
+    def configure(self, executable_path: str) -> None:
+        """Use a new executable path for subsequent requests."""
+
+        if executable_path == self._executable_path:
+            return
+        self.shutdown(wait=True)
+        self._executable_path = executable_path
+
+    def get_version(
+        self,
+        callback: ResultCallback | None = None,
+        error_callback: ErrorCallback | None = None,
+    ) -> None:
+        """Request the OpenModelica version without blocking the caller."""
+        self.send_expression("getVersion()", callback, error_callback)
+
+    def build_model(
+        self,
+        model: str,
+        model_name: str,
+        callback: ResultCallback | None = None,
+        error_callback: ErrorCallback | None = None,
+    ) -> None:
+        """Load and build one composed model as an ordered worker operation."""
+
+        def operation(omc, _temp_dir: Path):
+            loaded = omc.sendExpression(f"loadString({json.dumps(model)})")
+            if loaded is not True:
+                raise RuntimeError("OpenModelica could not load the composed model")
+            return omc.sendExpression(f"buildModel({model_name})")
+
+        self._submit("build model", operation, callback, error_callback)
+
+    def run_model(
+        self,
+        executable: str,
+        arguments: list[str],
+        progress_callback: Callable[[SimulationProgress], None] | None = None,
+        message_callback: Callable[[SimulationMessage], None] | None = None,
+        callback: ResultCallback | None = None,
+        error_callback: ErrorCallback | None = None,
+    ) -> None:
+        """Run a built model and consume its XML/TCP status stream."""
+
+        def operation(omc, temp_dir: Path):
+            return _run_model_with_tcp(
+                omc,
+                executable,
+                arguments,
+                temp_dir,
+                progress_callback,
+                message_callback,
+            )
+
+        self._submit("run simulation", operation, callback, error_callback)
+
+    def send_expression(
+        self,
+        expression: str,
+        callback: ResultCallback | None = None,
+        error_callback: ErrorCallback | None = None,
+        *,
+        parsed: bool = True,
+    ) -> None:
+        """Queue an OMC expression for ordered execution on the worker thread."""
+
+        def operation(omc, _temp_dir: Path):
+            return omc.sendExpression(expression, parsed=parsed)
+
+        self._submit(expression, operation, callback, error_callback)
+
+    def _submit(
+        self,
+        description: str,
+        operation: Callable[[Any, Path], Any],
+        callback: ResultCallback | None,
+        error_callback: ErrorCallback | None,
+    ) -> None:
+        request = _Request(description, operation, callback, error_callback)
+        self._ensure_worker().put(request)
+
+    def shutdown(self, *, wait: bool = True) -> None:
+        """Ask the worker to close its OMC session after queued requests."""
+
+        with self._lifecycle_lock:
+            worker = self._worker
+            queue = self._queue
+            self._worker = None
+            self._queue = None
+        if queue is not None:
+            queue.put(None)
+        if wait and worker is not None and worker is not current_thread():
+            worker.join()
+        if worker is None:
+            self._cleanup_temp_dir()
+
+    def __del__(self) -> None:
+        """Best-effort fallback; normal application shutdown is explicit."""
+
+        try:
+            self.shutdown(wait=False)
+        except Exception:
+            pass
+
+    def _ensure_worker(self) -> Queue[_Request | None]:
+        with self._lifecycle_lock:
+            if self._worker is not None and self._worker.is_alive():
+                return self._queue
+            temp_dir = self._ensure_temp_dir_locked()
+            queue: Queue[_Request | None] = Queue()
+            worker = Thread(
+                target=self._worker_main,
+                args=(queue, self._executable_path, temp_dir),
+                name="bedit-openmodelica",
+                daemon=True,
+            )
+            self._queue = queue
+            self._worker = worker
+            worker.start()
+            return queue
+
+    def _worker_main(
+        self,
+        queue: Queue[_Request | None],
+        executable_path: str,
+        temp_dir: Path,
+    ) -> None:
+        omc = None
+        try:
+            while (request := queue.get()) is not None:
+                try:
+                    if omc is None:
+                        omc = _create_session(executable_path)
+                        changed_directory = omc.sendExpression(
+                            f"cd({json.dumps(str(temp_dir))})"
+                        )
+                        if not changed_directory:
+                            raise RuntimeError(
+                                f"OpenModelica could not use {str(temp_dir)!r}"
+                            )
+                    result = request.operation(omc, temp_dir)
+                except Exception as error:
+                    if request.error_callback is None:
+                        log.exception(
+                            "OpenModelica request failed: %s", request.description
+                        )
+                    else:
+                        _deliver_callback(request.error_callback, error)
+                else:
+                    if request.callback is not None:
+                        _deliver_callback(request.callback, result)
+        finally:
+            transport_files = _ompython_transport_files(omc)
+            if omc is not None:
+                try:
+                    omc.sendExpression("quit()")
+                except Exception:
+                    log.debug("Could not close OpenModelica session", exc_info=True)
+            for path in transport_files:
+                try:
+                    path.unlink(missing_ok=True)
+                except OSError:
+                    log.debug("Could not remove OMPython file %s", path, exc_info=True)
+            self._cleanup_temp_dir(temp_dir)
+
+    def _ensure_temp_dir_locked(self) -> Path:
+        if self._temp_dir is None:
+            self._temp_dir = Path(tempfile.mkdtemp(prefix="bedit-openmodelica-"))
+        return self._temp_dir
+
+    def _cleanup_temp_dir(self, expected: Path | None = None) -> None:
+        with self._lifecycle_lock:
+            if expected is not None and self._temp_dir != expected:
+                temp_dir = expected
+            else:
+                temp_dir = self._temp_dir
+                self._temp_dir = None
+        if temp_dir is not None:
+            shutil.rmtree(temp_dir, ignore_errors=True)
+
+
+def _deliver_callback(callback: Callable[[Any], None], value: Any) -> None:
+    try:
+        callback(value)
+    except Exception:
+        log.exception("OpenModelica callback failed")
+
+
+def _create_session(executable_path: str):
+    from OMPython import OMCSessionZMQ
+
+    return OMCSessionZMQ(omhome=_openmodelica_home(executable_path))
+
+
+def _run_model_with_tcp(
+    omc,
+    executable: str,
+    arguments: list[str],
+    temp_dir: Path,
+    progress_callback: Callable[[SimulationProgress], None] | None,
+    message_callback: Callable[[SimulationMessage], None] | None,
+) -> SimulationExecutionResult:
+    executable_path = Path(executable)
+    executable_command = executable
+    if not executable_path.is_absolute() and executable_path.parent == Path("."):
+        executable_command = f"./{executable}"
+
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as server:
+        server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        server.bind(("127.0.0.1", 0))
+        server.listen(1)
+        server.settimeout(0.25)
+        port = server.getsockname()[1]
+        command = shlex.join([
+            executable_command,
+            *arguments,
+            f"-port={port}",
+            "-logFormat=xmltcp",
+        ])
+        output_path = temp_dir / "simulation-output.txt"
+        command_finished = Event()
+        reader_finished = Event()
+        reader_errors: list[Exception] = []
+
+        def read_progress() -> None:
+            try:
+                connection = _accept_simulation_connection(server, command_finished)
+                with connection, connection.makefile(
+                    "r", encoding="utf-8"
+                ) as stream:
+                    for line in stream:
+                        _handle_simulation_xml(
+                            line, progress_callback, message_callback
+                        )
+            except Exception as error:
+                reader_errors.append(error)
+            finally:
+                reader_finished.set()
+
+        reader = Thread(
+            target=read_progress,
+            name="bedit-simulation-progress",
+            daemon=True,
+        )
+        reader.start()
+        log.info("Starting simulation through OpenModelica: %s", command)
+        try:
+            return_code = omc.sendExpression(
+                f"system({json.dumps(command)}, {json.dumps(str(output_path))})"
+            )
+        finally:
+            command_finished.set()
+        if not reader_finished.wait(20.0):
+            raise TimeoutError("Simulation progress connection did not close")
+        if reader_errors:
+            raise reader_errors[0]
+        if return_code != 0:
+            output = output_path.read_text(errors="replace") if output_path.exists() else ""
+            detail = f": {output.strip()}" if output.strip() else ""
+            raise RuntimeError(
+                f"Simulation process exited with status {return_code}{detail}"
+            )
+        result_path = temp_dir / f"{Path(executable).stem}_res.csv"
+        if not result_path.is_file():
+            raise RuntimeError(
+                f"OpenModelica did not create the expected result file {result_path.name!r}"
+            )
+        data = load_openmodelica_csv(result_path)
+        log.info(
+            "Loaded %d result columns from %s", len(data), result_path.name
+        )
+        return SimulationExecutionResult(
+            return_code=int(return_code),
+            result_file=str(result_path),
+            data=data,
+        )
+
+
+def _accept_simulation_connection(
+    server: socket.socket, command_finished: Event
+) -> socket.socket:
+    deadline = time.monotonic() + 15.0
+    while time.monotonic() < deadline:
+        try:
+            connection, _address = server.accept()
+            return connection
+        except socket.timeout:
+            if command_finished.is_set():
+                raise RuntimeError(
+                    "Simulation command finished before opening its progress connection"
+                )
+    raise TimeoutError("Simulation did not connect to the progress server")
+
+
+def _handle_simulation_xml(
+    line: str,
+    progress_callback: Callable[[SimulationProgress], None] | None,
+    message_callback: Callable[[SimulationMessage], None] | None,
+) -> None:
+    text = line.strip()
+    if not text:
+        return
+    try:
+        element = ET.fromstring(text)
+    except ET.ParseError:
+        log.warning("Invalid simulation status XML: %s", text)
+        return
+    if element.tag == "status" and progress_callback is not None:
+        _deliver_callback(
+            progress_callback,
+            SimulationProgress(
+                phase=element.get("phase", ""),
+                current_step_size=float(element.get("currentStepSize", 0)),
+                time=float(element.get("time", 0)),
+                progress=int(float(element.get("progress", 0))),
+            ),
+        )
+    elif element.tag == "message":
+        message = SimulationMessage(
+            stream=element.get("stream", ""),
+            type=element.get("type", ""),
+            text=element.get("text", ""),
+        )
+        log.info("OpenModelica %s: %s", message.stream, message.text)
+        if message_callback is not None:
+            _deliver_callback(message_callback, message)
+
+
+def _ompython_transport_files(omc) -> set[Path]:
+    """Return only the log and port files owned by this OMPython session."""
+
+    if omc is None:
+        return set()
+    process = getattr(omc, "omc_process", None)
+    if process is None:
+        return set()
+    files: set[Path] = set()
+    temp_dir = getattr(process, "_temp_dir", None)
+    file_base = getattr(process, "_omc_filebase", None)
+    if temp_dir is not None and file_base:
+        files.add(Path(temp_dir) / f"{file_base}.log")
+    try:
+        port_file = process._get_portfile_path()
+    except Exception:
+        port_file = None
+    if port_file is not None:
+        files.add(Path(port_file))
+    return files
+
+
+def _openmodelica_home(executable_path: str) -> str | None:
+    """Convert an optional omc executable path to the home expected by OMPython."""
+
+    if not executable_path.strip():
+        return None
+    path = Path(os.path.expandvars(executable_path)).expanduser()
+    if path.name.lower() in {"omc", "omc.exe"}:
+        return str(path.parent.parent)
+    return str(path)

BEdit/src/bedit/core/simulation/results.py

@@ -0,0 +1,222 @@
+import csv
+import json
+import zlib
+from dataclasses import asdict, dataclass, field
+from pathlib import Path
+from typing import Any
+from uuid import uuid4
+
+import msgpack
+
+
+RESULTS_FORMAT = "bedit-simulation-results"
+RESULTS_VERSION = 1
+
+
+@dataclass
+class SimulationTrace:
+    """One plottable series; samples can be filled by a future result importer."""
+
+    name: str
+    x_values: list[float] = field(default_factory=list)
+    y_values: list[float] = field(default_factory=list)
+    x_label: str = "time"
+    y_label: str = ""
+    unit: str = ""
+    properties: dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class SimulationGraph:
+    """One graph workspace tab and its configured traces."""
+
+    id: str = field(default_factory=lambda: str(uuid4()))
+    title: str = "Graph 1"
+    x_axis: str = "time"
+    traces: list[SimulationTrace] = field(default_factory=list)
+
+
+@dataclass
+class SimulationResults:
+    """Serializable state displayed by the standalone simulation window."""
+
+    model_name: str = ""
+    status: dict[str, Any] = field(default_factory=dict)
+    messages: list[dict[str, str]] = field(default_factory=list)
+    data: dict[str, list[float]] = field(default_factory=dict)
+    graphs: list[SimulationGraph] = field(
+        default_factory=lambda: [SimulationGraph()]
+    )
+    metadata: dict[str, Any] = field(default_factory=dict)
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "format": RESULTS_FORMAT,
+            "version": RESULTS_VERSION,
+            "modelName": self.model_name,
+            "status": dict(self.status),
+            "messages": [dict(message) for message in self.messages],
+            "data": {name: list(values) for name, values in self.data.items()},
+            "graphs": [asdict(graph) for graph in self.graphs],
+            "metadata": dict(self.metadata),
+        }
+
+    @classmethod
+    def from_dict(cls, data: dict[str, Any]) -> "SimulationResults":
+        if data.get("format") != RESULTS_FORMAT:
+            raise ValueError("Not a BEdit simulation-results file")
+        if data.get("version") != RESULTS_VERSION:
+            raise ValueError(f"Unsupported simulation-results version: {data.get('version')!r}")
+        try:
+            graphs = [
+                SimulationGraph(
+                    id=str(graph["id"]),
+                    title=str(graph["title"]),
+                    x_axis=str(graph.get("x_axis", "time")),
+                    traces=[
+                        SimulationTrace(**trace) for trace in graph.get("traces", [])
+                    ],
+                )
+                for graph in data.get("graphs", [])
+            ]
+            return cls(
+                model_name=str(data.get("modelName", "")),
+                status=dict(data.get("status", {})),
+                messages=[dict(message) for message in data.get("messages", [])],
+                data={
+                    str(name): [float(value) for value in values]
+                    for name, values in dict(data.get("data", {})).items()
+                },
+                graphs=graphs,
+                metadata=dict(data.get("metadata", {})),
+            )
+        except (KeyError, TypeError, ValueError) as error:
+            raise ValueError("Malformed simulation-results data") from error
+
+
+@dataclass(frozen=True)
+class SimulationExecutionResult:
+    """Completed process information delivered before its temp files disappear."""
+
+    return_code: int
+    result_file: str
+    data: dict[str, list[float]]
+
+
+def load_openmodelica_csv(path: str | Path) -> dict[str, list[float]]:
+    """Read an OpenModelica CSV result as one numeric array per column."""
+
+    source = Path(path)
+    try:
+        with source.open(newline="", encoding="utf-8") as file:
+            reader = csv.reader(file)
+            headers = next(reader)
+            if not headers or any(not header for header in headers):
+                raise ValueError("The result CSV has an invalid header")
+            if len(set(headers)) != len(headers):
+                raise ValueError("The result CSV contains duplicate column names")
+            columns = {header: [] for header in headers}
+            for row_number, row in enumerate(reader, start=2):
+                if len(row) != len(headers):
+                    raise ValueError(
+                        f"Result CSV row {row_number} has {len(row)} values; "
+                        f"expected {len(headers)}"
+                    )
+                for header, value in zip(headers, row, strict=True):
+                    columns[header].append(float(value))
+    except OSError as error:
+        raise ValueError(f"Could not read OpenModelica results: {error}") from error
+    except StopIteration as error:
+        raise ValueError("The OpenModelica result CSV is empty") from error
+    except ValueError as error:
+        if str(error).startswith(("The result CSV", "Result CSV")):
+            raise
+        raise ValueError(f"The OpenModelica result CSV is not numeric: {error}") from error
+    return columns
+
+
+class JsonSimulationResultsSerializer:
+    @staticmethod
+    def load(path: Path) -> SimulationResults:
+        try:
+            data = json.loads(path.read_text(encoding="utf-8"))
+        except (OSError, json.JSONDecodeError) as error:
+            raise ValueError(f"Could not read simulation results: {error}") from error
+        if not isinstance(data, dict):
+            raise ValueError("Simulation-results root must be an object")
+        return SimulationResults.from_dict(data)
+
+    @staticmethod
+    def save(results: SimulationResults, path: Path) -> None:
+        temporary_path = path.with_suffix(path.suffix + ".tmp")
+        temporary_path.write_text(
+            json.dumps(results.to_dict(), indent=2, ensure_ascii=False) + "\n",
+            encoding="utf-8",
+        )
+        temporary_path.replace(path)
+
+
+class BerSimulationResultsSerializer:
+    """Compressed MessagePack serializer for binary simulation results."""
+
+    MAGIC = b"BER\x00"
+    VERSION = 1
+
+    @classmethod
+    def load(cls, path: Path) -> SimulationResults:
+        try:
+            payload = path.read_bytes()
+        except OSError as error:
+            raise ValueError(f"Could not read simulation results: {error}") from error
+        header = cls.MAGIC + bytes([cls.VERSION])
+        if not payload.startswith(header):
+            raise ValueError("This is not a supported BEdit binary results file")
+        try:
+            data = msgpack.unpackb(
+                zlib.decompress(payload[len(header) :]), raw=False
+            )
+        except (ValueError, zlib.error, msgpack.exceptions.MsgpackException) as error:
+            raise ValueError("The BEdit binary results file is damaged") from error
+        if not isinstance(data, dict):
+            raise ValueError("The BEdit binary results file has an invalid root value")
+        return SimulationResults.from_dict(data)
+
+    @classmethod
+    def save(cls, results: SimulationResults, path: Path) -> None:
+        packed = msgpack.packb(results.to_dict(), use_bin_type=True)
+        payload = cls.MAGIC + bytes([cls.VERSION]) + zlib.compress(packed, level=9)
+        temporary_path = path.with_suffix(path.suffix + ".tmp")
+        temporary_path.write_bytes(payload)
+        temporary_path.replace(path)
+
+
+class SimulationResultsSerializer:
+    """Select JSON or compressed MessagePack based on the file extension."""
+
+    @staticmethod
+    def load(path: str | Path) -> SimulationResults:
+        target = Path(path)
+        serializer = (
+            BerSimulationResultsSerializer
+            if target.suffix.lower() == ".ber"
+            else JsonSimulationResultsSerializer
+        )
+        return serializer.load(target)
+
+    @staticmethod
+    def save(results: SimulationResults, path: str | Path) -> None:
+        target = Path(path)
+        serializer = (
+            BerSimulationResultsSerializer
+            if target.suffix.lower() == ".ber"
+            else JsonSimulationResultsSerializer
+        )
+        serializer.save(results, target)
+
+
+def save_simulation_results(path: str | Path, results: SimulationResults) -> None:
+    SimulationResultsSerializer.save(results, path)
+
+
+def load_simulation_results(path: str | Path) -> SimulationResults:
+    return SimulationResultsSerializer.load(path)

BEdit/src/bedit/core/simulation/runner.py

@@ -1,162 +0,0 @@
-import json
-import os
-from collections.abc import Callable
-from pathlib import Path
-from threading import Lock, Thread
-
-from bedit.core.application_log import get_logger
-
-
-log = get_logger(__name__)
-_worker_lock = Lock()
-_worker: Thread | None = None
-
-
-def run_validation_async(
-    openmodelica_path: str = "",
-    model: str = "",
-    model_name: str = "",
-    task: Callable[[], None] | None = None,
-) -> None:
-    """Start one validation task in a background thread and return immediately."""
-
-    global _worker
-    with _worker_lock:
-        if _worker is not None and _worker.is_alive():
-            raise RuntimeError("An OpenModelica task is already running")
-        _worker = Thread(
-            target=_run_safely,
-            args=(
-                task
-                or (lambda: _run_validation(openmodelica_path, model, model_name)),
-            ),
-            name="bedit-simulation",
-            daemon=True,
-        )
-        _worker.start()
-
-
-def run_simulation_async(
-    openmodelica_path: str = "",
-    model: str = "",
-    model_name: str = "",
-    task: Callable[[], None] | None = None,
-) -> None:
-    """Start one validation-and-simulation task and return immediately."""
-
-    global _worker
-    with _worker_lock:
-        if _worker is not None and _worker.is_alive():
-            raise RuntimeError("An OpenModelica task is already running")
-        _worker = Thread(
-            target=_run_safely,
-            args=(
-                task
-                or (lambda: _run_openmodelica(openmodelica_path, model, model_name)),
-            ),
-            name="bedit-simulation",
-            daemon=True,
-        )
-        _worker.start()
-
-
-def simulation_is_running() -> bool:
-    """Return whether the background simulation worker is active."""
-
-    with _worker_lock:
-        return _worker is not None and _worker.is_alive()
-
-
-def _run_safely(task: Callable[[], None]) -> None:
-    global _worker
-    try:
-        task()
-    except Exception:
-        log.exception("Simulation run failed")
-    finally:
-        with _worker_lock:
-            _worker = None
-
-
-def _run_validation(
-    openmodelica_path: str = "", model: str = "", model_name: str = ""
-) -> None:
-    """Create the OpenModelica session and perform a validation"""
-
-    from OMPython import OMCSessionZMQ
-
-    omhome = _openmodelica_home(openmodelica_path)
-    omc = OMCSessionZMQ(omhome=omhome)
-    _validate_model(omc, model, model_name)
-
-
-def _run_openmodelica(
-    openmodelica_path: str = "", model: str = "", model_name: str = ""
-) -> None:
-    """Validate and run the current simulation stub in one OMC session."""
-
-    from OMPython import OMCSessionZMQ
-
-    omhome = _openmodelica_home(openmodelica_path)
-    omc = OMCSessionZMQ(omhome=omhome)
-    _validate_model(omc, model, model_name)
-    
-    log.info("OpenModelica Version: %s", omc.sendExpression("getVersion()"))
-
-    loaded = omc.sendExpression(f"loadString({json.dumps(model)})")
-    if loaded is not True:
-        details = _get_error_string(omc)
-        raise RuntimeError(f"OpenModelica could not load the model: {details}")
-    
-    result = omc.sendExpression(f"checkModel({model_name})")
-    details = _get_error_string(omc)
-    if not isinstance(result, str) or "completed successfully" not in result:
-        message = details or result or "Unknown OpenModelica validation error"
-        raise RuntimeError(f"OpenModelica model validation failed: {message}")
-
-def _validate_model(omc, model: str, model_name: str) -> None:
-    if not model:
-        raise ValueError("There is no compiled Modelica source to validate")
-    if not model_name:
-        raise ValueError("The compiled model has no Modelica name")
-
-    loaded = omc.sendExpression(f"loadString({json.dumps(model)})")
-    if loaded is not True:
-        details = _get_error_string(omc)
-        raise RuntimeError(f"OpenModelica could not load the model: {details}")
-
-    result = omc.sendExpression(f"checkModel({model_name})")
-    details = _get_error_string(omc)
-    if not isinstance(result, str) or "completed successfully" not in result:
-        message = details or result or "Unknown OpenModelica validation error"
-        raise RuntimeError(f"OpenModelica model validation failed: {message}")
-    log.info("%s", result)
-    if details:
-        log.warning("OpenModelica validation messages: %s", details)
-
-
-def _get_error_string(omc) -> str:
-    """Read OMC's deliberately unparsed error response as plain text."""
-
-    raw = omc.sendExpression("getErrorString()", parsed=False)
-    if not isinstance(raw, str):
-        return str(raw or "")
-    raw = raw.strip()
-    if not raw:
-        return ""
-    try:
-        decoded = json.loads(raw)
-    except (TypeError, json.JSONDecodeError):
-        return raw
-    return decoded if isinstance(decoded, str) else str(decoded)
-
-
-def _openmodelica_home(openmodelica_path: str) -> str | None:
-    """Convert an optional omc executable path to the home expected by OMPython."""
-
-    if not openmodelica_path.strip():
-        return None
-    path = Path(os.path.expandvars(openmodelica_path)).expanduser()
-    if path.name.lower() in {"omc", "omc.exe"}:
-        return str(path.parent.parent)
-    return str(path)

BEdit/src/bedit/core/simulation/service.py

@@ -1,50 +1,156 @@
+from collections.abc import Callable
 from typing import Any
 
 from bedit.core.application_log import get_logger
-from bedit.core.simulation.compiler import compile_graph
-from bedit.core.simulation.runner import run_simulation_async, run_validation_async
+from bedit.core.simulation.composer import compose_graph
+from bedit.core.simulation.openmodelica import (
+    ErrorCallback,
+    OpenModelicaInterface,
+    ResultCallback,
+    SimulationMessage,
+    SimulationProgress,
+)
 
 
 log = get_logger(__name__)
 
 
 class Simulation:
-    """Application-owned simulation state and compiler facade."""
+    """Application-owned composition state and OpenModelica interface."""
 
     def __init__(self, *, openmodelica_path: str = "") -> None:
         self.state: dict[str, Any] = {}
-        self.last_compilation_input: dict[str, Any] | None = None
-        self.last_compilation_output: str | None = None
+        self.last_composition_input: dict[str, Any] | None = None
+        self.last_composition_output: str | None = None
         self.id_list: dict[str, Any] = {}
-        self.openmodelica_path = openmodelica_path
+        self.model_name: str | None = None
+        self._openmodelica_path = openmodelica_path
+        self.openmodelica = OpenModelicaInterface(openmodelica_path)
+        self.model_path: str | None = None
+        self.simulation_progress: SimulationProgress | None = None
 
-    def compile(self, graph: dict[str, Any]) -> None:
-        """Compile a serialized component tree and retain the result."""
+    @property
+    def openmodelica_path(self) -> str:
+        return self._openmodelica_path
 
-        self._prepare_compilation(graph)
-        run_validation_async(
-            self.openmodelica_path,
-            self.last_compilation_output,
+    @openmodelica_path.setter
+    def openmodelica_path(self, value: str) -> None:
+        self._openmodelica_path = value
+        self.openmodelica.configure(value)
+
+    def compose(
+        self,
+        graph: dict[str, Any],
+        callback: Callable[[str], None] | None = None,
+        error_callback: ErrorCallback | None = None,
+    ) -> None:
+        """Compose and retain the active graph's Modelica representation."""
+
+        self.model_path = None
+        self.compose_source(graph)
+
+        def _model_compiled(result):
+            log.info("Compiling OK: %s", result)
+            try:
+                self.model_path = str(result[0])
+            except (IndexError, TypeError) as error:
+                failure = RuntimeError(
+                    f"OpenModelica returned an invalid build result: {result!r}"
+                )
+                failure.__cause__ = error
+                if error_callback is not None:
+                    error_callback(failure)
+                else:
+                    log.error("%s", failure)
+                return
+            if callback is not None:
+                callback(self.model_path)
+
+        self.openmodelica.build_model(
+            self.last_composition_output,
             self.model_name,
+            _model_compiled,
+            error_callback,
         )
 
-    def _prepare_compilation(self, graph: dict[str, Any]) -> None:
-        """Generate and retain Modelica without starting a background operation."""
+    def compose_source(self, graph: dict[str, Any]) -> tuple[str, str]:
+        """Compose Modelica source without asking OpenModelica to build it."""
 
-        result = compile_graph(graph)
-        self.last_compilation_input = result.graph
+        result = compose_graph(graph)
+        self.last_composition_input = result.graph
         self.id_list = result.objects_by_id
-        self.last_compilation_output = result.modelica
+        self.last_composition_output = result.modelica
         self.model_name = result.model_name
+        # log.info("Composed OpenModelica model:\n%s", result.modelica)
+        return result.model_name, result.modelica
 
-    def run_simulation(self, graph: dict[str, Any]) -> None:
-        """Start the simulation without blocking the calling UI thread."""
+    def run_simulation(
+        self,
+        graph: dict[str, Any],
+        progress_callback: Callable[[SimulationProgress], None] | None = None,
+        message_callback: Callable[[SimulationMessage], None] | None = None,
+        callback: ResultCallback | None = None,
+        error_callback: ErrorCallback | None = None,
+    ) -> None:
+        """Compose, build, and asynchronously run the current graph."""
 
-        # Always regenerate before running, then validate and simulate as one
-        # background operation so the two phases cannot compete for the worker.
-        self._prepare_compilation(graph)
-        run_simulation_async(
-            self.openmodelica_path,
-            self.last_compilation_output,
-            self.model_name,
+        self.simulation_progress = None
+
+        def report_progress(progress: SimulationProgress) -> None:
+            self.simulation_progress = progress
+            if progress_callback is not None:
+                progress_callback(progress)
+
+        def run_model(model_path: str) -> None:
+            try:
+                arguments = self.build_simulation_arguments()
+            except Exception as error:
+                if error_callback is not None:
+                    error_callback(error)
+                else:
+                    log.exception("Could not prepare simulation arguments")
+                return
+            self.openmodelica.run_model(
+                model_path,
+                arguments,
+                report_progress,
+                message_callback,
+                callback,
+                error_callback,
             )
+
+        self.compose(graph, run_model, error_callback)
+
+    def get_progress(self) -> SimulationProgress | None:
+        """Return the most recently received simulation status."""
+
+        return self.simulation_progress
+
+    def shutdown(self, *, wait: bool = True) -> None:
+        """Close OpenModelica and clean its generated working directory."""
+        self.openmodelica.shutdown(wait=wait)
+        self.model_path = None
+
+    def build_simulation_arguments(self) -> list[str]:
+        opts = self.last_composition_input["implementation"]["graph"].get(
+            "simulation", {}
+        )
+        start_time = float(opts.get("startTime", 0.0))
+        stop_time = float(opts.get("stopTime", 1.0))
+        interval_mode = opts.get("intervalMode", "numberOfIntervals")
+        interval_time = float(opts.get("intervalTime", 0.002))
+        if interval_mode == "numberOfIntervals":
+            intervals = int(opts.get("numberOfIntervals", 500))
+            if intervals <= 0:
+                raise ValueError("Number of simulation intervals must be positive")
+            interval_time = (stop_time - start_time) / intervals
+        if interval_time <= 0:
+            raise ValueError("Simulation interval must be positive")
+        arguments = [
+            "-outputFormat=csv",
+            f"-startTime={start_time}",
+            f"-stopTime={stop_time}",
+            f"-stepSize={interval_time}",
+        ]
+        log.info("Running model with: %s", arguments)
+        return arguments

BEdit/src/bedit/gui/controllers/commands.py

@@ -345,7 +345,7 @@ class PasteSelectionCommand(QUndoCommand):
     def __init__(
         self,
         controller,
-        owner_id: str,
+        owner_id: str | None,
         blocks: dict[str, Component],
         connections: dict[str, Connection],
     ) -> None:

BEdit/src/bedit/gui/controllers/document.py

@@ -168,7 +168,13 @@ class DocumentController(QObject):
             name=self._available_component_name(base_name, self.document.roots.values(), number),
             implementation_kind=kind,
             icon=Icon(text="Graph" if kind == "graph" else "Text"),
-            source={"equations": ""} if kind == "text" else {},
+            source={
+                "declarations": "",
+                "initialEquations": "",
+                "equations": "",
+            }
+            if kind == "text"
+            else {},
         )
         self.undo_stack.push(AddComponentCommand(self, None, component))
         self.activate_component(component.id)
@@ -187,7 +193,13 @@ class DocumentController(QObject):
             name=self._available_component_name(base_name, owner.graph.blocks.values(), number),
             implementation_kind=kind,
             icon=Icon(text="Graph" if kind == "graph" else "Text"),
-            source={"equations": ""} if kind == "text" else {},
+            source={
+                "declarations": "",
+                "initialEquations": "",
+                "equations": "",
+            }
+            if kind == "text"
+            else {},
         )
         self.undo_stack.push(AddComponentCommand(self, owner_id, component))
         return component.id
@@ -421,17 +433,35 @@ class DocumentController(QObject):
         if old != new:
             self.undo_stack.push(EditGraphParametersCommand(self, old, new))
 
-    def compile_active_graph(self) -> None:
+    def compose_active_graph(self) -> None:
         component = self.active_component
         if component is None or component.implementation_kind != "graph":
-            raise ValueError("Open a graph component before compiling")
-        self.simulation.compile(component.to_dict())
+            raise ValueError("Open a graph component before composing")
+        self.simulation.compose(component.to_dict())
 
-    def run_simulation(self) -> None:
+    def compose_active_graph_source(self) -> tuple[str, str]:
+        component = self.active_component
+        if component is None or component.implementation_kind != "graph":
+            raise ValueError("Open a graph component before exporting a model")
+        return self.simulation.compose_source(component.to_dict())
+
+    def run_simulation(
+        self,
+        progress_callback=None,
+        message_callback=None,
+        callback=None,
+        error_callback=None,
+    ) -> None:
         component = self.active_component
         if component is None or component.implementation_kind != "graph":
             raise ValueError("Open a graph component before running a simulation")
-        self.simulation.run_simulation(component.to_dict())
+        self.simulation.run_simulation(
+            component.to_dict(),
+            progress_callback,
+            message_callback,
+            callback,
+            error_callback,
+        )
 
     def set_route_waypoints(self, item_kind: str, item_id: str, waypoints: list[QPointF]) -> None:
         item = (
@@ -624,6 +654,8 @@ class DocumentController(QObject):
         self,
         inputs: list[Port],
         outputs: list[Port],
+        declarations: str,
+        initial_equations: str,
         equations: str,
         parameters: list[Parameter],
     ) -> None:
@@ -670,6 +702,8 @@ class DocumentController(QObject):
             "outputs": [port.to_dict() for port in outputs],
             "source": {
                 "equations": equations,
+                "declarations": declarations,
+                "initialEquations": initial_equations,
             },
             "parameters": [parameter.to_dict() for parameter in parameters],
         }
@@ -951,6 +985,68 @@ class DocumentController(QObject):
             self.undo_stack.push(PasteSelectionCommand(self, owner.id, blocks, connections))
         return list(blocks)
 
+    def paste_components_to(
+        self,
+        owner_id: str | None,
+        source_components: list[Component],
+        source_connections: list[Connection] | None = None,
+    ) -> list[str]:
+        """Clone components into the document root or a graph at origin."""
+
+        if self.document is None:
+            raise ValueError("Open or create a document before pasting components")
+        if owner_id is None:
+            siblings = self.document.roots.values()
+        else:
+            owner = self.document.find_component(owner_id)
+            if owner is None or owner.implementation_kind != "graph":
+                raise ValueError("Components can only be pasted into a graph")
+            siblings = owner.graph.blocks.values()
+
+        pairs = [(source, clone_component(source)) for source in source_components]
+        if not pairs:
+            return []
+        id_map = {source.id: clone.id for source, clone in pairs}
+        used = list(siblings)
+        minimum_x = min(source.x for source, _clone in pairs)
+        minimum_y = min(source.y for source, _clone in pairs)
+        blocks: dict[str, Component] = {}
+        for source, clone in pairs:
+            clone.name = self._available_component_name(source.name, used, 0)
+            if owner_id is not None:
+                clone.x = source.x - minimum_x
+                clone.y = source.y - minimum_y
+            blocks[clone.id] = clone
+            used.append(clone)
+
+        connections: dict[str, Connection] = {}
+        if owner_id is not None:
+            for source in source_connections or []:
+                if source.source.block not in id_map or source.target.block not in id_map:
+                    continue
+                properties = deepcopy(source.properties)
+                for point in properties.get("waypoints", []):
+                    if isinstance(point, dict):
+                        point["x"] = float(point.get("x", 0)) - minimum_x
+                        point["y"] = float(point.get("y", 0)) - minimum_y
+                connection = Connection(
+                    id=str(uuid4()),
+                    source=Endpoint(
+                        block=id_map[source.source.block], port=source.source.port
+                    ),
+                    target=Endpoint(
+                        block=id_map[source.target.block], port=source.target.port
+                    ),
+                    name=source.name,
+                    properties=properties,
+                )
+                connections[connection.id] = connection
+
+        self.undo_stack.push(
+            PasteSelectionCommand(self, owner_id, blocks, connections)
+        )
+        return list(blocks)
+
     def _graph_for(self, owner_id: str):
         if self.document is None:
             raise ValueError("There is no open document")

BEdit/src/bedit/gui/editors/text_definition.py

@@ -14,7 +14,7 @@ PROPERTIES_ROLE = Qt.ItemDataRole.UserRole + 1
 
 
 class TextDefinitionEditor(QWidget):
-    """Editor for a text component's equations, ports, and parameters."""
+    """Editor for a text component's Modelica source, ports, and parameters."""
 
     modifiedChanged = Signal(bool)
     definitionEdited = Signal()
@@ -32,7 +32,10 @@ class TextDefinitionEditor(QWidget):
             QHeaderView.ResizeMode.Stretch
         )
         self.ui.columnSplitter.setSizes([560, 340])
+        self.ui.sourceSplitter.setSizes([180, 180, 240])
         self.ui.definitionSplitter.setSizes([300, 300])
+        self.ui.declarationsEdit.textChanged.connect(self._mark_modified)
+        self.ui.initialEquationsEdit.textChanged.connect(self._mark_modified)
         self.ui.equationsEdit.textChanged.connect(self._mark_modified)
         self.ui.portsTable.cellChanged.connect(self._symbols_modified)
         self.ui.parametersTable.cellChanged.connect(self._symbols_modified)
@@ -52,6 +55,14 @@ class TextDefinitionEditor(QWidget):
     def equations(self) -> str:
         return self.ui.equationsEdit.toPlainText()
 
+    @property
+    def declarations(self) -> str:
+        return self.ui.declarationsEdit.toPlainText()
+
+    @property
+    def initial_equations(self) -> str:
+        return self.ui.initialEquationsEdit.toPlainText()
+
     @property
     def ports(self) -> tuple[list[Port], list[Port]]:
         inputs: list[Port] = []
@@ -87,12 +98,16 @@ class TextDefinitionEditor(QWidget):
 
     def set_definition(
         self,
+        declarations: str,
+        initial_equations: str,
         equations: str,
         inputs: list[Port],
         outputs: list[Port],
         parameters: list[Parameter],
     ) -> None:
         self._loading = True
+        self.ui.declarationsEdit.setPlainText(declarations)
+        self.ui.initialEquationsEdit.setPlainText(initial_equations)
         self.ui.equationsEdit.setPlainText(equations)
         self.ui.portsTable.setRowCount(0)
         for port in inputs:
@@ -102,11 +117,7 @@ class TextDefinitionEditor(QWidget):
         self.ui.parametersTable.setRowCount(0)
         for parameter in parameters:
             self._append_parameter(parameter)
-        self.ui.equationsEdit.set_symbols(
-            [port.name for port in inputs],
-            [port.name for port in outputs],
-            [parameter.name for parameter in parameters],
-        )
+        self._set_editor_symbols(inputs, outputs, parameters)
         self._loading = False
         self.set_modified(False)
         self._update_buttons()
@@ -128,11 +139,22 @@ class TextDefinitionEditor(QWidget):
 
     def _refresh_editor_symbols(self) -> None:
         inputs, outputs = self.ports
-        self.ui.equationsEdit.set_symbols(
+        self._set_editor_symbols(inputs, outputs, self.parameters)
+
+    def _set_editor_symbols(
+        self,
+        inputs: list[Port],
+        outputs: list[Port],
+        parameters: list[Parameter],
+    ) -> None:
+        symbols = (
             [port.name for port in inputs],
             [port.name for port in outputs],
-            [parameter.name for parameter in self.parameters],
+            [parameter.name for parameter in parameters],
         )
+        self.ui.declarationsEdit.set_symbols(*symbols)
+        self.ui.initialEquationsEdit.set_symbols(*symbols)
+        self.ui.equationsEdit.set_symbols(*symbols)
 
     def _new_combo(self, values: list[tuple[str, str]], current: str) -> QComboBox:
         combo = QComboBox(self)

BEdit/src/bedit/gui/generated/resources_rc.py

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@@ -2563,6 +2813,10 @@ qt_resource_name = b"\
 \x0f\xba\x1e'\
 \x00d\
 \x00r\x00a\x00w\x00-\x00p\x00a\x00t\x00h\x00.\x00p\x00n\x00g\
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 \x00\x0d\
 \x0b\xe6\x1f\xa7\
 \x00d\
@@ -2632,10 +2886,24 @@ qt_resource_name = b"\
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 \
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+\x00n\x00g\
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@@ -2653,63 +2921,71 @@ qt_resource_struct = b"\
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 "
 

BEdit/src/bedit/gui/generated/ui_main_window.py

@@ -39,91 +39,99 @@ class Ui_MainWindow(object):
         self.actionGraphParameters = QAction(MainWindow)
         self.actionGraphParameters.setObjectName(u"actionGraphParameters")
         icon1 = QIcon()
-        icon1.addFile(u":/icons/icons/configure.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        icon1.addFile(u":/icons/icons/view-form-table.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
         self.actionGraphParameters.setIcon(icon1)
-        self.actionCompile = QAction(MainWindow)
-        self.actionCompile.setObjectName(u"actionCompile")
+        self.actionCompose = QAction(MainWindow)
+        self.actionCompose.setObjectName(u"actionCompose")
         icon2 = QIcon()
         icon2.addFile(u":/icons/icons/run-build.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionCompile.setIcon(icon2)
+        self.actionCompose.setIcon(icon2)
         self.actionRunSimulation = QAction(MainWindow)
         self.actionRunSimulation.setObjectName(u"actionRunSimulation")
         icon3 = QIcon()
         icon3.addFile(u":/icons/icons/media-playback-start.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
         self.actionRunSimulation.setIcon(icon3)
+        self.actionSimulationWindow = QAction(MainWindow)
+        self.actionSimulationWindow.setObjectName(u"actionSimulationWindow")
+        icon4 = QIcon()
+        icon4.addFile(u":/icons/icons/office-chart-line.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionSimulationWindow.setIcon(icon4)
+        self.actionExportModel = QAction(MainWindow)
+        self.actionExportModel.setObjectName(u"actionExportModel")
+        icon5 = QIcon()
+        icon5.addFile(u":/icons/icons/document-save-as.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionExportModel.setIcon(icon5)
         self.actionNew = QAction(MainWindow)
         self.actionNew.setObjectName(u"actionNew")
-        icon4 = QIcon()
-        icon4.addFile(u":/icons/icons/document-new.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionNew.setIcon(icon4)
+        icon6 = QIcon()
+        icon6.addFile(u":/icons/icons/document-new.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionNew.setIcon(icon6)
         self.actionRotateClockwise = QAction(MainWindow)
         self.actionRotateClockwise.setObjectName(u"actionRotateClockwise")
-        icon5 = QIcon()
-        icon5.addFile(u":/icons/icons/transform-rotate.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionRotateClockwise.setIcon(icon5)
+        icon7 = QIcon()
+        icon7.addFile(u":/icons/icons/transform-rotate.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionRotateClockwise.setIcon(icon7)
         self.actionZoomIn = QAction(MainWindow)
         self.actionZoomIn.setObjectName(u"actionZoomIn")
-        icon6 = QIcon()
-        icon6.addFile(u":/icons/icons/zoom-in.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionZoomIn.setIcon(icon6)
+        icon8 = QIcon()
+        icon8.addFile(u":/icons/icons/zoom-in.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionZoomIn.setIcon(icon8)
         self.actionZoomOut = QAction(MainWindow)
         self.actionZoomOut.setObjectName(u"actionZoomOut")
-        icon7 = QIcon()
-        icon7.addFile(u":/icons/icons/zoom-out.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionZoomOut.setIcon(icon7)
+        icon9 = QIcon()
+        icon9.addFile(u":/icons/icons/zoom-out.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionZoomOut.setIcon(icon9)
         self.actionCenterView = QAction(MainWindow)
         self.actionCenterView.setObjectName(u"actionCenterView")
-        icon8 = QIcon()
-        icon8.addFile(u":/icons/icons/zoom-original.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionCenterView.setIcon(icon8)
+        icon10 = QIcon()
+        icon10.addFile(u":/icons/icons/zoom-original.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionCenterView.setIcon(icon10)
         self.actionOpen = QAction(MainWindow)
         self.actionOpen.setObjectName(u"actionOpen")
-        icon9 = QIcon()
-        icon9.addFile(u":/icons/icons/document-open.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionOpen.setIcon(icon9)
+        icon11 = QIcon()
+        icon11.addFile(u":/icons/icons/document-open.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionOpen.setIcon(icon11)
         self.actionReloadLibraries = QAction(MainWindow)
         self.actionReloadLibraries.setObjectName(u"actionReloadLibraries")
         self.actionReloadSimulation = QAction(MainWindow)
         self.actionReloadSimulation.setObjectName(u"actionReloadSimulation")
         self.actionSave = QAction(MainWindow)
         self.actionSave.setObjectName(u"actionSave")
-        icon10 = QIcon()
-        icon10.addFile(u":/icons/icons/document-save.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionSave.setIcon(icon10)
+        icon12 = QIcon()
+        icon12.addFile(u":/icons/icons/document-save.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionSave.setIcon(icon12)
         self.actionSaveAs = QAction(MainWindow)
         self.actionSaveAs.setObjectName(u"actionSaveAs")
-        icon11 = QIcon()
-        icon11.addFile(u":/icons/icons/document-save-as.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionSaveAs.setIcon(icon11)
+        self.actionSaveAs.setIcon(icon5)
         self.actionExit = QAction(MainWindow)
         self.actionExit.setObjectName(u"actionExit")
         self.actionClose = QAction(MainWindow)
         self.actionClose.setObjectName(u"actionClose")
         self.actionUndo = QAction(MainWindow)
         self.actionUndo.setObjectName(u"actionUndo")
-        icon12 = QIcon()
-        icon12.addFile(u":/icons/icons/edit-undo.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionUndo.setIcon(icon12)
+        icon13 = QIcon()
+        icon13.addFile(u":/icons/icons/edit-undo.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionUndo.setIcon(icon13)
         self.actionRedo = QAction(MainWindow)
         self.actionRedo.setObjectName(u"actionRedo")
-        icon13 = QIcon()
-        icon13.addFile(u":/icons/icons/edit-redo.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionRedo.setIcon(icon13)
+        icon14 = QIcon()
+        icon14.addFile(u":/icons/icons/edit-redo.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionRedo.setIcon(icon14)
         self.actionCut = QAction(MainWindow)
         self.actionCut.setObjectName(u"actionCut")
-        icon14 = QIcon()
-        icon14.addFile(u":/icons/icons/edit-cut.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionCut.setIcon(icon14)
+        icon15 = QIcon()
+        icon15.addFile(u":/icons/icons/edit-cut.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionCut.setIcon(icon15)
         self.actionCopy = QAction(MainWindow)
         self.actionCopy.setObjectName(u"actionCopy")
-        icon15 = QIcon()
-        icon15.addFile(u":/icons/icons/edit-copy.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionCopy.setIcon(icon15)
+        icon16 = QIcon()
+        icon16.addFile(u":/icons/icons/edit-copy.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionCopy.setIcon(icon16)
         self.actionPaste = QAction(MainWindow)
         self.actionPaste.setObjectName(u"actionPaste")
-        icon16 = QIcon()
-        icon16.addFile(u":/icons/icons/edit-paste.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.actionPaste.setIcon(icon16)
+        icon17 = QIcon()
+        icon17.addFile(u":/icons/icons/edit-paste.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionPaste.setIcon(icon17)
         self.actionSelectAll = QAction(MainWindow)
         self.actionSelectAll.setObjectName(u"actionSelectAll")
         self.actionDelete = QAction(MainWindow)
@@ -213,18 +221,18 @@ class Ui_MainWindow(object):
         self.workspaceHeaderLayout.setContentsMargins(6, 2, 6, 2)
         self.navigateUpButton = QToolButton(self.workspaceHeader)
         self.navigateUpButton.setObjectName(u"navigateUpButton")
-        icon17 = QIcon()
-        icon17.addFile(u":/icons/icons/arrow-up.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.navigateUpButton.setIcon(icon17)
+        icon18 = QIcon()
+        icon18.addFile(u":/icons/icons/arrow-up.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.navigateUpButton.setIcon(icon18)
 
         self.workspaceHeaderLayout.addWidget(self.navigateUpButton)
 
         self.navigateDownButton = QToolButton(self.workspaceHeader)
         self.navigateDownButton.setObjectName(u"navigateDownButton")
         self.navigateDownButton.setEnabled(False)
-        icon18 = QIcon()
-        icon18.addFile(u":/icons/icons/arrow-down.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.navigateDownButton.setIcon(icon18)
+        icon19 = QIcon()
+        icon19.addFile(u":/icons/icons/arrow-down.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.navigateDownButton.setIcon(icon19)
 
         self.workspaceHeaderLayout.addWidget(self.navigateDownButton)
 
@@ -244,9 +252,9 @@ class Ui_MainWindow(object):
 
         self.pointerToolButton = QToolButton(self.workspaceHeader)
         self.pointerToolButton.setObjectName(u"pointerToolButton")
-        icon19 = QIcon()
-        icon19.addFile(u":/icons/icons/edit-select.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.pointerToolButton.setIcon(icon19)
+        icon20 = QIcon()
+        icon20.addFile(u":/icons/icons/edit-select.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.pointerToolButton.setIcon(icon20)
         self.pointerToolButton.setCheckable(True)
         self.pointerToolButton.setChecked(True)
 
@@ -254,43 +262,43 @@ class Ui_MainWindow(object):
 
         self.connectToolButton = QToolButton(self.workspaceHeader)
         self.connectToolButton.setObjectName(u"connectToolButton")
-        icon20 = QIcon()
-        icon20.addFile(u":/icons/icons/network-connect.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.connectToolButton.setIcon(icon20)
+        icon21 = QIcon()
+        icon21.addFile(u":/icons/icons/network-connect.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.connectToolButton.setIcon(icon21)
         self.connectToolButton.setCheckable(True)
 
         self.workspaceHeaderLayout.addWidget(self.connectToolButton)
 
         self.boxToolButton = QToolButton(self.workspaceHeader)
         self.boxToolButton.setObjectName(u"boxToolButton")
-        icon21 = QIcon()
-        icon21.addFile(u":/icons/icons/draw-rectangle.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.boxToolButton.setIcon(icon21)
+        icon22 = QIcon()
+        icon22.addFile(u":/icons/icons/draw-rectangle.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.boxToolButton.setIcon(icon22)
         self.boxToolButton.setCheckable(True)
 
         self.workspaceHeaderLayout.addWidget(self.boxToolButton)
 
         self.lineToolButton = QToolButton(self.workspaceHeader)
         self.lineToolButton.setObjectName(u"lineToolButton")
-        icon22 = QIcon()
-        icon22.addFile(u":/icons/icons/draw-bezier-curves.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.lineToolButton.setIcon(icon22)
+        icon23 = QIcon()
+        icon23.addFile(u":/icons/icons/draw-bezier-curves.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.lineToolButton.setIcon(icon23)
         self.lineToolButton.setCheckable(True)
 
         self.workspaceHeaderLayout.addWidget(self.lineToolButton)
 
         self.textToolButton = QToolButton(self.workspaceHeader)
         self.textToolButton.setObjectName(u"textToolButton")
-        icon23 = QIcon()
-        icon23.addFile(u":/icons/icons/draw-text.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
-        self.textToolButton.setIcon(icon23)
+        icon24 = QIcon()
+        icon24.addFile(u":/icons/icons/draw-text.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.textToolButton.setIcon(icon24)
         self.textToolButton.setCheckable(True)
 
         self.workspaceHeaderLayout.addWidget(self.textToolButton)
 
         self.rotateToolButton = QToolButton(self.workspaceHeader)
         self.rotateToolButton.setObjectName(u"rotateToolButton")
-        self.rotateToolButton.setIcon(icon5)
+        self.rotateToolButton.setIcon(icon7)
 
         self.workspaceHeaderLayout.addWidget(self.rotateToolButton)
 
@@ -435,7 +443,9 @@ class Ui_MainWindow(object):
         self.menuHelp.addAction(self.actionAboutQt)
         self.menuSimulation.addAction(self.actionSimulationSettings)
         self.menuSimulation.addAction(self.actionGraphParameters)
-        self.menuSimulation.addAction(self.actionCompile)
+        self.menuSimulation.addAction(self.actionCompose)
+        self.menuSimulation.addAction(self.actionExportModel)
+        self.menuSimulation.addAction(self.actionSimulationWindow)
         self.menuSimulation.addAction(self.actionRunSimulation)
         self.fileToolbar.addAction(self.actionNew)
         self.fileToolbar.addAction(self.actionOpen)
@@ -451,7 +461,8 @@ class Ui_MainWindow(object):
         self.cameraToolbar.addAction(self.actionCenterView)
         self.simulationToolbar.addAction(self.actionSimulationSettings)
         self.simulationToolbar.addAction(self.actionGraphParameters)
-        self.simulationToolbar.addAction(self.actionCompile)
+        self.simulationToolbar.addAction(self.actionCompose)
+        self.simulationToolbar.addAction(self.actionSimulationWindow)
         self.simulationToolbar.addAction(self.actionRunSimulation)
 
         self.retranslateUi(MainWindow)
@@ -472,12 +483,12 @@ class Ui_MainWindow(object):
 #if QT_CONFIG(statustip)
         self.actionGraphParameters.setStatusTip(QCoreApplication.translate("MainWindow", u"Edit parameters throughout the active graph", None))
 #endif // QT_CONFIG(statustip)
-        self.actionCompile.setText(QCoreApplication.translate("MainWindow", u"Compile", None))
+        self.actionCompose.setText(QCoreApplication.translate("MainWindow", u"Compose", None))
 #if QT_CONFIG(statustip)
-        self.actionCompile.setStatusTip(QCoreApplication.translate("MainWindow", u"Compile the active graph for simulation", None))
+        self.actionCompose.setStatusTip(QCoreApplication.translate("MainWindow", u"Compose the active graph as an OpenModelica model", None))
 #endif // QT_CONFIG(statustip)
 #if QT_CONFIG(shortcut)
-        self.actionCompile.setShortcut(QCoreApplication.translate("MainWindow", u"F5", None))
+        self.actionCompose.setShortcut(QCoreApplication.translate("MainWindow", u"F5", None))
 #endif // QT_CONFIG(shortcut)
         self.actionRunSimulation.setText(QCoreApplication.translate("MainWindow", u"Run", None))
 #if QT_CONFIG(statustip)
@@ -486,6 +497,14 @@ class Ui_MainWindow(object):
 #if QT_CONFIG(shortcut)
         self.actionRunSimulation.setShortcut(QCoreApplication.translate("MainWindow", u"F6", None))
 #endif // QT_CONFIG(shortcut)
+        self.actionSimulationWindow.setText(QCoreApplication.translate("MainWindow", u"Simulation Window", None))
+#if QT_CONFIG(statustip)
+        self.actionSimulationWindow.setStatusTip(QCoreApplication.translate("MainWindow", u"Show the simulation results window", None))
+#endif // QT_CONFIG(statustip)
+        self.actionExportModel.setText(QCoreApplication.translate("MainWindow", u"Export Model\u2026", None))
+#if QT_CONFIG(statustip)
+        self.actionExportModel.setStatusTip(QCoreApplication.translate("MainWindow", u"Save the composed OpenModelica model to a file", None))
+#endif // QT_CONFIG(statustip)
         self.actionNew.setText(QCoreApplication.translate("MainWindow", u"&New", None))
 #if QT_CONFIG(statustip)
         self.actionNew.setStatusTip(QCoreApplication.translate("MainWindow", u"Create a new document", None))

BEdit/src/bedit/gui/generated/ui_simulation_window.py

@@ -0,0 +1,244 @@
+# -*- coding: utf-8 -*-
+
+################################################################################
+## Form generated from reading UI file 'simulation_window.ui'
+##
+## Created by: Qt User Interface Compiler version 6.11.1
+##
+## WARNING! All changes made in this file will be lost when recompiling UI file!
+################################################################################
+
+from PySide6.QtCore import (QCoreApplication, QDate, QDateTime, QLocale,
+    QMetaObject, QObject, QPoint, QRect,
+    QSize, QTime, QUrl, Qt)
+from PySide6.QtGui import (QAction, QBrush, QColor, QConicalGradient,
+    QCursor, QFont, QFontDatabase, QGradient,
+    QIcon, QImage, QKeySequence, QLinearGradient,
+    QPainter, QPalette, QPixmap, QRadialGradient,
+    QTransform)
+from PySide6.QtWidgets import (QAbstractItemView, QApplication, QDockWidget, QHBoxLayout,
+    QHeaderView, QLabel, QListWidget, QListWidgetItem,
+    QMainWindow, QMenu, QMenuBar, QProgressBar,
+    QSizePolicy, QTabWidget, QToolBar, QTreeWidget,
+    QTreeWidgetItem, QVBoxLayout, QWidget)
+from . import resources_rc
+
+class Ui_SimulationWindow(object):
+    def setupUi(self, SimulationWindow):
+        if not SimulationWindow.objectName():
+            SimulationWindow.setObjectName(u"SimulationWindow")
+        SimulationWindow.resize(900, 650)
+        icon = QIcon()
+        icon.addFile(u":/icons/icons/office-chart-line.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        SimulationWindow.setWindowIcon(icon)
+        self.actionOpen = QAction(SimulationWindow)
+        self.actionOpen.setObjectName(u"actionOpen")
+        icon1 = QIcon()
+        icon1.addFile(u":/icons/icons/document-open.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionOpen.setIcon(icon1)
+        self.actionSave = QAction(SimulationWindow)
+        self.actionSave.setObjectName(u"actionSave")
+        icon2 = QIcon()
+        icon2.addFile(u":/icons/icons/document-save.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionSave.setIcon(icon2)
+        self.actionClear = QAction(SimulationWindow)
+        self.actionClear.setObjectName(u"actionClear")
+        icon3 = QIcon()
+        icon3.addFile(u":/icons/icons/document-new.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionClear.setIcon(icon3)
+        self.actionSaveAs = QAction(SimulationWindow)
+        self.actionSaveAs.setObjectName(u"actionSaveAs")
+        icon4 = QIcon()
+        icon4.addFile(u":/icons/icons/document-save-as.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionSaveAs.setIcon(icon4)
+        self.actionExit = QAction(SimulationWindow)
+        self.actionExit.setObjectName(u"actionExit")
+        self.actionAbout = QAction(SimulationWindow)
+        self.actionAbout.setObjectName(u"actionAbout")
+        self.actionAboutQt = QAction(SimulationWindow)
+        self.actionAboutQt.setObjectName(u"actionAboutQt")
+        self.actionToggleResults = QAction(SimulationWindow)
+        self.actionToggleResults.setObjectName(u"actionToggleResults")
+        self.actionToggleResults.setCheckable(True)
+        self.actionToggleResults.setChecked(True)
+        self.actionAddGraph = QAction(SimulationWindow)
+        self.actionAddGraph.setObjectName(u"actionAddGraph")
+        icon5 = QIcon()
+        icon5.addFile(u":/icons/icons/list-add.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionAddGraph.setIcon(icon5)
+        self.actionRemoveGraph = QAction(SimulationWindow)
+        self.actionRemoveGraph.setObjectName(u"actionRemoveGraph")
+        icon6 = QIcon()
+        icon6.addFile(u":/icons/icons/list-remove.png", QSize(), QIcon.Mode.Normal, QIcon.State.Off)
+        self.actionRemoveGraph.setIcon(icon6)
+        self.centralWidget = QWidget(SimulationWindow)
+        self.centralWidget.setObjectName(u"centralWidget")
+        self.resultsLayout = QVBoxLayout(self.centralWidget)
+        self.resultsLayout.setObjectName(u"resultsLayout")
+        self.graphTabs = QTabWidget(self.centralWidget)
+        self.graphTabs.setObjectName(u"graphTabs")
+        self.graphTabs.setTabsClosable(False)
+        self.graphTabs.setMovable(True)
+
+        self.resultsLayout.addWidget(self.graphTabs)
+
+        SimulationWindow.setCentralWidget(self.centralWidget)
+        self.menuBar = QMenuBar(SimulationWindow)
+        self.menuBar.setObjectName(u"menuBar")
+        self.menuBar.setGeometry(QRect(0, 0, 900, 24))
+        self.menuFile = QMenu(self.menuBar)
+        self.menuFile.setObjectName(u"menuFile")
+        self.menuView = QMenu(self.menuBar)
+        self.menuView.setObjectName(u"menuView")
+        self.menuPanels = QMenu(self.menuView)
+        self.menuPanels.setObjectName(u"menuPanels")
+        self.menuToolbars = QMenu(self.menuView)
+        self.menuToolbars.setObjectName(u"menuToolbars")
+        self.menuHelp = QMenu(self.menuBar)
+        self.menuHelp.setObjectName(u"menuHelp")
+        self.menuGraph = QMenu(self.menuBar)
+        self.menuGraph.setObjectName(u"menuGraph")
+        SimulationWindow.setMenuBar(self.menuBar)
+        self.workspaceToolbar = QToolBar(SimulationWindow)
+        self.workspaceToolbar.setObjectName(u"workspaceToolbar")
+        self.workspaceToolbar.setToolButtonStyle(Qt.ToolButtonStyle.ToolButtonIconOnly)
+        SimulationWindow.addToolBar(Qt.ToolBarArea.TopToolBarArea, self.workspaceToolbar)
+        self.fileToolbar = QToolBar(SimulationWindow)
+        self.fileToolbar.setObjectName(u"fileToolbar")
+        self.fileToolbar.setToolButtonStyle(Qt.ToolButtonStyle.ToolButtonIconOnly)
+        SimulationWindow.addToolBar(Qt.ToolBarArea.TopToolBarArea, self.fileToolbar)
+        self.statusDock = QDockWidget(SimulationWindow)
+        self.statusDock.setObjectName(u"statusDock")
+        self.statusDockContents = QWidget()
+        self.statusDockContents.setObjectName(u"statusDockContents")
+        self.horizontalLayout = QHBoxLayout(self.statusDockContents)
+        self.horizontalLayout.setObjectName(u"horizontalLayout")
+        self.timeLabel = QLabel(self.statusDockContents)
+        self.timeLabel.setObjectName(u"timeLabel")
+
+        self.horizontalLayout.addWidget(self.timeLabel)
+
+        self.progressBar = QProgressBar(self.statusDockContents)
+        self.progressBar.setObjectName(u"progressBar")
+        self.progressBar.setMaximum(10000)
+        self.progressBar.setValue(0)
+
+        self.horizontalLayout.addWidget(self.progressBar)
+
+        self.statusLabel = QLabel(self.statusDockContents)
+        self.statusLabel.setObjectName(u"statusLabel")
+
+        self.horizontalLayout.addWidget(self.statusLabel)
+
+        self.statusDock.setWidget(self.statusDockContents)
+        SimulationWindow.addDockWidget(Qt.DockWidgetArea.BottomDockWidgetArea, self.statusDock)
+        self.logDock = QDockWidget(SimulationWindow)
+        self.logDock.setObjectName(u"logDock")
+        self.logDock.setFloating(False)
+        self.logDock.setFeatures(QDockWidget.DockWidgetFeature.DockWidgetFloatable|QDockWidget.DockWidgetFeature.DockWidgetMovable)
+        self.logDockContents = QWidget()
+        self.logDockContents.setObjectName(u"logDockContents")
+        self.logLayout = QVBoxLayout(self.logDockContents)
+        self.logLayout.setObjectName(u"logLayout")
+        self.messageList = QListWidget(self.logDockContents)
+        self.messageList.setObjectName(u"messageList")
+        self.messageList.setAlternatingRowColors(True)
+
+        self.logLayout.addWidget(self.messageList)
+
+        self.logDock.setWidget(self.logDockContents)
+        SimulationWindow.addDockWidget(Qt.DockWidgetArea.BottomDockWidgetArea, self.logDock)
+        self.signalsDock = QDockWidget(SimulationWindow)
+        self.signalsDock.setObjectName(u"signalsDock")
+        self.signalsDockContents = QWidget()
+        self.signalsDockContents.setObjectName(u"signalsDockContents")
+        self.signalsLayout = QVBoxLayout(self.signalsDockContents)
+        self.signalsLayout.setObjectName(u"signalsLayout")
+        self.signalsTree = QTreeWidget(self.signalsDockContents)
+        self.signalsTree.setObjectName(u"signalsTree")
+        self.signalsTree.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
+        self.signalsTree.setSelectionMode(QAbstractItemView.SelectionMode.ExtendedSelection)
+        self.signalsTree.setHeaderHidden(True)
+
+        self.signalsLayout.addWidget(self.signalsTree)
+
+        self.signalsDock.setWidget(self.signalsDockContents)
+        SimulationWindow.addDockWidget(Qt.DockWidgetArea.RightDockWidgetArea, self.signalsDock)
+
+        self.menuBar.addAction(self.menuFile.menuAction())
+        self.menuBar.addAction(self.menuView.menuAction())
+        self.menuBar.addAction(self.menuGraph.menuAction())
+        self.menuBar.addAction(self.menuHelp.menuAction())
+        self.menuFile.addAction(self.actionOpen)
+        self.menuFile.addAction(self.actionSave)
+        self.menuFile.addAction(self.actionSaveAs)
+        self.menuFile.addSeparator()
+        self.menuFile.addAction(self.actionClear)
+        self.menuFile.addSeparator()
+        self.menuFile.addAction(self.actionExit)
+        self.menuView.addAction(self.menuPanels.menuAction())
+        self.menuView.addAction(self.menuToolbars.menuAction())
+        self.menuHelp.addAction(self.actionAbout)
+        self.menuHelp.addAction(self.actionAboutQt)
+        self.menuGraph.addAction(self.actionAddGraph)
+        self.menuGraph.addAction(self.actionRemoveGraph)
+        self.workspaceToolbar.addAction(self.actionAddGraph)
+        self.workspaceToolbar.addAction(self.actionRemoveGraph)
+        self.fileToolbar.addAction(self.actionClear)
+        self.fileToolbar.addAction(self.actionOpen)
+        self.fileToolbar.addAction(self.actionSave)
+        self.fileToolbar.addAction(self.actionSaveAs)
+
+        self.retranslateUi(SimulationWindow)
+
+        QMetaObject.connectSlotsByName(SimulationWindow)
+    # setupUi
+
+    def retranslateUi(self, SimulationWindow):
+        SimulationWindow.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Simulation", None))
+        self.actionOpen.setText(QCoreApplication.translate("SimulationWindow", u"&Open\u2026", None))
+#if QT_CONFIG(shortcut)
+        self.actionOpen.setShortcut(QCoreApplication.translate("SimulationWindow", u"Ctrl+O", None))
+#endif // QT_CONFIG(shortcut)
+        self.actionSave.setText(QCoreApplication.translate("SimulationWindow", u"&Save\u2026", None))
+#if QT_CONFIG(shortcut)
+        self.actionSave.setShortcut(QCoreApplication.translate("SimulationWindow", u"Ctrl+S", None))
+#endif // QT_CONFIG(shortcut)
+        self.actionClear.setText(QCoreApplication.translate("SimulationWindow", u"&Clear", None))
+        self.actionSaveAs.setText(QCoreApplication.translate("SimulationWindow", u"Save &As\u2026", None))
+#if QT_CONFIG(shortcut)
+        self.actionSaveAs.setShortcut(QCoreApplication.translate("SimulationWindow", u"Ctrl+Shift+S", None))
+#endif // QT_CONFIG(shortcut)
+        self.actionExit.setText(QCoreApplication.translate("SimulationWindow", u"E&xit", None))
+#if QT_CONFIG(shortcut)
+        self.actionExit.setShortcut(QCoreApplication.translate("SimulationWindow", u"Ctrl+W", None))
+#endif // QT_CONFIG(shortcut)
+        self.actionAbout.setText(QCoreApplication.translate("SimulationWindow", u"&About Simulation Window", None))
+        self.actionAboutQt.setText(QCoreApplication.translate("SimulationWindow", u"About &Qt", None))
+        self.actionToggleResults.setText(QCoreApplication.translate("SimulationWindow", u"Results", None))
+        self.actionAddGraph.setText(QCoreApplication.translate("SimulationWindow", u"Add Graph", None))
+#if QT_CONFIG(statustip)
+        self.actionAddGraph.setStatusTip(QCoreApplication.translate("SimulationWindow", u"Add a graph workspace tab", None))
+#endif // QT_CONFIG(statustip)
+        self.actionRemoveGraph.setText(QCoreApplication.translate("SimulationWindow", u"Remove Current Graph", None))
+#if QT_CONFIG(statustip)
+        self.actionRemoveGraph.setStatusTip(QCoreApplication.translate("SimulationWindow", u"Remove the current graph workspace tab", None))
+#endif // QT_CONFIG(statustip)
+        self.menuFile.setTitle(QCoreApplication.translate("SimulationWindow", u"&File", None))
+        self.menuView.setTitle(QCoreApplication.translate("SimulationWindow", u"&View", None))
+        self.menuPanels.setTitle(QCoreApplication.translate("SimulationWindow", u"&Panels", None))
+        self.menuToolbars.setTitle(QCoreApplication.translate("SimulationWindow", u"&Toolbars", None))
+        self.menuHelp.setTitle(QCoreApplication.translate("SimulationWindow", u"&Help", None))
+        self.menuGraph.setTitle(QCoreApplication.translate("SimulationWindow", u"&Graph", None))
+        self.workspaceToolbar.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Workspace", None))
+        self.fileToolbar.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"File", None))
+        self.statusDock.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Status", None))
+        self.timeLabel.setText(QCoreApplication.translate("SimulationWindow", u"Time: 0 s", None))
+        self.progressBar.setFormat(QCoreApplication.translate("SimulationWindow", u"%p%", None))
+        self.statusLabel.setText(QCoreApplication.translate("SimulationWindow", u"No simulation has been run yet.", None))
+        self.logDock.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Log", None))
+        self.signalsDock.setWindowTitle(QCoreApplication.translate("SimulationWindow", u"Signals", None))
+        ___qtreewidgetitem = self.signalsTree.headerItem()
+        ___qtreewidgetitem.setText(0, QCoreApplication.translate("SimulationWindow", u"Signal", None))
+    # retranslateUi
+

BEdit/src/bedit/gui/generated/ui_text_definition_editor.py

@@ -34,7 +34,31 @@ class Ui_TextDefinitionEditor(object):
         self.columnSplitter.setObjectName(u"columnSplitter")
         self.columnSplitter.setOrientation(Qt.Orientation.Horizontal)
         self.columnSplitter.setChildrenCollapsible(False)
-        self.equationsGroup = QGroupBox(self.columnSplitter)
+        self.sourceSplitter = QSplitter(self.columnSplitter)
+        self.sourceSplitter.setObjectName(u"sourceSplitter")
+        self.sourceSplitter.setOrientation(Qt.Orientation.Vertical)
+        self.sourceSplitter.setChildrenCollapsible(False)
+        self.declarationsGroup = QGroupBox(self.sourceSplitter)
+        self.declarationsGroup.setObjectName(u"declarationsGroup")
+        self.declarationsLayout = QVBoxLayout(self.declarationsGroup)
+        self.declarationsLayout.setObjectName(u"declarationsLayout")
+        self.declarationsEdit = OpenModelicaEditor(self.declarationsGroup)
+        self.declarationsEdit.setObjectName(u"declarationsEdit")
+
+        self.declarationsLayout.addWidget(self.declarationsEdit)
+
+        self.sourceSplitter.addWidget(self.declarationsGroup)
+        self.initialEquationsGroup = QGroupBox(self.sourceSplitter)
+        self.initialEquationsGroup.setObjectName(u"initialEquationsGroup")
+        self.initialEquationsLayout = QVBoxLayout(self.initialEquationsGroup)
+        self.initialEquationsLayout.setObjectName(u"initialEquationsLayout")
+        self.initialEquationsEdit = OpenModelicaEditor(self.initialEquationsGroup)
+        self.initialEquationsEdit.setObjectName(u"initialEquationsEdit")
+
+        self.initialEquationsLayout.addWidget(self.initialEquationsEdit)
+
+        self.sourceSplitter.addWidget(self.initialEquationsGroup)
+        self.equationsGroup = QGroupBox(self.sourceSplitter)
         self.equationsGroup.setObjectName(u"equationsGroup")
         self.equationsLayout = QVBoxLayout(self.equationsGroup)
         self.equationsLayout.setObjectName(u"equationsLayout")
@@ -43,7 +67,8 @@ class Ui_TextDefinitionEditor(object):
 
         self.equationsLayout.addWidget(self.equationsEdit)
 
-        self.columnSplitter.addWidget(self.equationsGroup)
+        self.sourceSplitter.addWidget(self.equationsGroup)
+        self.columnSplitter.addWidget(self.sourceSplitter)
         self.definitionSplitter = QSplitter(self.columnSplitter)
         self.definitionSplitter.setObjectName(u"definitionSplitter")
         self.definitionSplitter.setOrientation(Qt.Orientation.Vertical)
@@ -141,6 +166,8 @@ class Ui_TextDefinitionEditor(object):
     # setupUi
 
     def retranslateUi(self, TextDefinitionEditor):
+        self.declarationsGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Declarations", None))
+        self.initialEquationsGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Initial Equations", None))
         self.equationsGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Equations", None))
         self.portsGroup.setTitle(QCoreApplication.translate("TextDefinitionEditor", u"Ports", None))
         ___qtablewidgetitem = self.portsTable.horizontalHeaderItem(0)

BEdit/src/bedit/gui/graphics/workspace.py

@@ -1892,6 +1892,22 @@ class GraphWorkspaceView(QGraphicsView):
         if self.controller is None:
             return
         mime_data = QApplication.clipboard().mimeData()
+        if mime_data.hasFormat(COMPONENT_MIME_TYPE):
+            try:
+                payload = json.loads(
+                    bytes(mime_data.data(COMPONENT_MIME_TYPE)).decode("utf-8")
+                )
+                source = Component.from_dict(payload)
+            except (KeyError, TypeError, ValueError, json.JSONDecodeError):
+                return
+            component_id = self.controller.add_component_copy(source, QPointF(0, 0))
+            scene = self.scene()
+            if isinstance(scene, GraphScene):
+                scene.clearSelection()
+                item = scene.component_items.get(component_id)
+                if item is not None:
+                    item.setSelected(True)
+            return
         if not mime_data.hasFormat(SELECTION_MIME_TYPE):
             return
         try:

BEdit/src/bedit/gui/main_window.py

@@ -1,10 +1,12 @@
+import json
 from copy import deepcopy
 from pathlib import Path
 
-from PySide6.QtCore import Qt, Slot
+from PySide6.QtCore import QByteArray, QMimeData, Qt, Slot
 from PySide6.QtGui import QCloseEvent
 from PySide6.QtWidgets import (
     QButtonGroup,
+    QApplication,
     QFileDialog,
     QMainWindow,
     QMenu,
@@ -12,7 +14,7 @@ from PySide6.QtWidgets import (
     QTabWidget,
 )
 
-from bedit.core.model import Component
+from bedit.core.model import Component, Connection
 from bedit.core.application_log import get_logger
 from bedit.core.serializer import DocumentSerializer
 from bedit.core.simulation import Simulation
@@ -22,16 +24,20 @@ from bedit.gui.dialogs.graph_parameters import GraphParametersDialog
 from bedit.gui.dialogs.item_options import ItemOptionsDialog
 from bedit.gui.models.library_repository import LibraryRepository
 from bedit.gui.models.library_tree import (
+    COMPONENT_MIME_TYPE,
+    COMPONENT_ROLE,
     COMPONENT_ID_ROLE,
     COMPONENT_INSTANCE_ROLE,
     ITEM_KIND_ROLE,
     DocumentTreeModel,
     LibraryTreeModel,
 )
+from bedit.gui.graphics.workspace import SELECTION_MIME_TYPE
 from bedit.gui.dialogs.settings import SettingsDialog
 from bedit.gui.dialogs.port_options import PortOptionsDialog
 from bedit.gui.dialogs.parameter_options import ParameterOptionsDialog
 from bedit.gui.dialogs.simulation_settings import SimulationSettingsDialog
+from bedit.gui.simulation_window import SimulationWindow
 from bedit.gui.preferences import application_settings
 from bedit.gui.simulation_reload import reload_simulation
 from bedit.gui.generated.ui_main_window import Ui_MainWindow
@@ -54,6 +60,9 @@ class MainWindow(QMainWindow):
         self.log.info("BEdit started")
         self.settings = application_settings()
         self._applying_text_definition = False
+        # Keep a Python-owned top-level window. Giving it MainWindow as its Qt
+        # parent makes some Linux window managers inherit the BEdit window icon.
+        self._simulation_window = SimulationWindow()
 
         self.libraries = LibraryRepository(self)
         self.simulation = Simulation(
@@ -67,6 +76,7 @@ class MainWindow(QMainWindow):
         )
         self.document_tree_model = DocumentTreeModel(self.document_controller, self)
         self._configure_models()
+        QApplication.clipboard().dataChanged.connect(self._update_edit_actions)
         self._connect_actions()
         self._populate_view_menu()
         self._restore_window_geometry()
@@ -100,6 +110,10 @@ class MainWindow(QMainWindow):
         self.ui.documentTreeView.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
         self.ui.documentTreeView.customContextMenuRequested.connect(self.show_library_context_menu)
         self.ui.documentTreeView.doubleClicked.connect(self.activate_tree_component)
+        self.ui.documentTreeView.clicked.connect(
+            lambda _index: self._update_edit_actions()
+        )
+        self.ui.treeView.clicked.connect(lambda _index: self._update_edit_actions())
         self.document_tree_model.rebuilt.connect(self.ui.documentTreeView.expandAll)
         self.ui.graphView.set_model(self.document_controller)
         self.ui.graphView.componentOptionsRequested.connect(self.show_component_options)
@@ -153,9 +167,9 @@ class MainWindow(QMainWindow):
         self.ui.actionUndo.triggered.connect(self.document_controller.undo_stack.undo)
         self.ui.actionRedo.triggered.connect(self.document_controller.undo_stack.redo)
         self.ui.actionDelete.triggered.connect(self.ui.graphView.delete_selected)
-        self.ui.actionCopy.triggered.connect(self.ui.graphView.copy_selection)
-        self.ui.actionCut.triggered.connect(self.ui.graphView.cut_selection)
-        self.ui.actionPaste.triggered.connect(self.ui.graphView.paste_selection)
+        self.ui.actionCopy.triggered.connect(self.copy_selection)
+        self.ui.actionCut.triggered.connect(self.cut_selection)
+        self.ui.actionPaste.triggered.connect(self.paste_selection)
         self.ui.actionSelectAll.triggered.connect(self.ui.graphView.select_all)
         self.ui.actionRotateClockwise.triggered.connect(self.ui.graphView.rotate_selected)
         self.addAction(self.ui.actionRotateClockwise)
@@ -166,7 +180,9 @@ class MainWindow(QMainWindow):
             self.show_simulation_settings
         )
         self.ui.actionGraphParameters.triggered.connect(self.show_graph_parameters)
-        self.ui.actionCompile.triggered.connect(self.compile_active_graph)
+        self.ui.actionCompose.triggered.connect(self.compose_active_graph)
+        self.ui.actionExportModel.triggered.connect(self.export_model)
+        self.ui.actionSimulationWindow.triggered.connect(self.show_simulation_window)
         self.ui.actionRunSimulation.triggered.connect(self.run_simulation)
         self.document_controller.undo_stack.canUndoChanged.connect(self.ui.actionUndo.setEnabled)
         self.document_controller.undo_stack.canRedoChanged.connect(self.ui.actionRedo.setEnabled)
@@ -239,20 +255,59 @@ class MainWindow(QMainWindow):
                 QMessageBox.warning(self, "Cannot change graph parameters", str(error))
 
     @Slot()
-    def compile_active_graph(self) -> None:
+    def compose_active_graph(self) -> None:
         try:
-            self.document_controller.compile_active_graph()
+            self.document_controller.compose_active_graph()
         except ValueError as error:
-            self.log.error("Compile failed: %s", error)
-            QMessageBox.warning(self, "Cannot compile", str(error))
+            self.log.error("Composition failed: %s", error)
+            QMessageBox.warning(self, "Cannot compose", str(error))
+
+    @Slot()
+    def export_model(self) -> None:
+        try:
+            model_name, source = self.document_controller.compose_active_graph_source()
+        except ValueError as error:
+            self.log.error("Model export composition failed: %s", error)
+            QMessageBox.warning(self, "Cannot Export Model", str(error))
+            return
+        file_name, _selected_filter = QFileDialog.getSaveFileName(
+            self,
+            "Export OpenModelica Model",
+            f"{model_name}.mo",
+            "Modelica Models (*.mo);;All Files (*)",
+        )
+        if not file_name:
+            return
+        path = Path(file_name)
+        if not path.suffix:
+            path = path.with_suffix(".mo")
+        temporary_path = path.with_suffix(path.suffix + ".tmp")
+        try:
+            temporary_path.write_text(source, encoding="utf-8")
+            temporary_path.replace(path)
+        except OSError as error:
+            self.log.error("Could not export model %s: %s", path, error)
+            QMessageBox.critical(self, "Cannot Export Model", str(error))
+            return
+        self.log.info("Exported OpenModelica model to %s", path)
+
+    @Slot()
+    def show_simulation_window(self) -> None:
+        self._simulation_window.show()
+        self._simulation_window.raise_()
+        self._simulation_window.activateWindow()
 
     @Slot()
     def run_simulation(self) -> None:
+        window = self._simulation_window
+        callbacks = window.begin_run()
+        self.show_simulation_window()
         try:
-            self.document_controller.run_simulation()
+            self.document_controller.run_simulation(*callbacks)
+            window.prepare_run_model(self.simulation.model_name)
         except Exception as error:
             self.log.exception("Simulation run failed")
-            QMessageBox.warning(self, "Cannot run simulation", str(error))
+            window.report_start_error(error)
 
     def _restore_window_geometry(self) -> None:
         geometry = self.settings.value("window/geometry")
@@ -281,7 +336,8 @@ class MainWindow(QMainWindow):
             self._set_graph_controls_visible(False)
             self.ui.actionSimulationSettings.setEnabled(False)
             self.ui.actionGraphParameters.setEnabled(False)
-            self.ui.actionCompile.setEnabled(False)
+            self.ui.actionCompose.setEnabled(False)
+            self.ui.actionExportModel.setEnabled(False)
             self.ui.actionRunSimulation.setEnabled(False)
             self._update_edit_actions()
             return
@@ -292,7 +348,8 @@ class MainWindow(QMainWindow):
         is_graph = component.implementation_kind == "graph"
         self.ui.actionSimulationSettings.setEnabled(is_graph)
         self.ui.actionGraphParameters.setEnabled(is_graph)
-        self.ui.actionCompile.setEnabled(is_graph)
+        self.ui.actionCompose.setEnabled(is_graph)
+        self.ui.actionExportModel.setEnabled(is_graph)
         self.ui.actionRunSimulation.setEnabled(is_graph)
         self.ui.workspaceModeLabel.setText("Graph" if is_graph else "Text")
         self.ui.workspaceStack.setCurrentWidget(
@@ -311,8 +368,24 @@ class MainWindow(QMainWindow):
         has_selection = bool(
             self.ui.graphView.scene() and self.ui.graphView.scene().selectedItems()
         )
-        for action in (self.ui.actionCut, self.ui.actionCopy, self.ui.actionDelete):
-            action.setEnabled(is_graph and has_selection)
+        document_component_selected = bool(
+            self.ui.documentTreeView.currentIndex().data(COMPONENT_ID_ROLE)
+        )
+        library_component_selected = isinstance(
+            self.ui.treeView.currentIndex().data(COMPONENT_ROLE), dict
+        )
+        document_has_focus = self._view_has_focus(self.ui.documentTreeView)
+        library_has_focus = self._view_has_focus(self.ui.treeView)
+        self.ui.actionCopy.setEnabled(
+            (is_graph and has_selection)
+            or (document_has_focus and document_component_selected)
+            or (library_has_focus and library_component_selected)
+        )
+        self.ui.actionCut.setEnabled(
+            (is_graph and has_selection)
+            or (document_has_focus and document_component_selected)
+        )
+        self.ui.actionDelete.setEnabled(is_graph and has_selection)
         self.ui.actionRotateClockwise.setEnabled(
             is_graph and self.ui.graphView.has_selected_components()
         )
@@ -320,11 +393,114 @@ class MainWindow(QMainWindow):
             is_graph and self.ui.graphView.has_selected_components()
         )
         self.ui.actionSelectAll.setEnabled(is_graph)
-        self.ui.actionPaste.setEnabled(is_graph)
+        can_paste_component = QApplication.clipboard().mimeData().hasFormat(
+            COMPONENT_MIME_TYPE
+        ) or QApplication.clipboard().mimeData().hasFormat(SELECTION_MIME_TYPE)
+        self.ui.actionPaste.setEnabled(
+            (is_graph and not document_has_focus and not library_has_focus)
+            or (
+                document_has_focus
+                and self.document_controller.document is not None
+                and can_paste_component
+            )
+        )
         self.ui.navigateDownButton.setEnabled(
             is_graph and self.ui.graphView.has_single_selected_component()
         )
 
+    def copy_selection(self) -> bool:
+        if self._view_has_focus(self.ui.documentTreeView):
+            return self._copy_tree_component(self.ui.documentTreeView)
+        if self._view_has_focus(self.ui.treeView):
+            return self._copy_tree_component(self.ui.treeView)
+        return self.ui.graphView.copy_selection()
+
+    def cut_selection(self) -> None:
+        if self._view_has_focus(self.ui.documentTreeView):
+            index = self.ui.documentTreeView.currentIndex()
+            component_id = index.data(COMPONENT_ID_ROLE)
+            if component_id and self._copy_tree_component(self.ui.documentTreeView):
+                self.document_controller.delete_component(component_id)
+            return
+        if self._view_has_focus(self.ui.treeView):
+            self._copy_tree_component(self.ui.treeView)
+            return
+        self.ui.graphView.cut_selection()
+
+    def paste_selection(self) -> None:
+        if self._view_has_focus(self.ui.documentTreeView):
+            self._paste_into_document_tree()
+            return
+        self.ui.graphView.paste_selection()
+
+    def _copy_tree_component(self, tree) -> bool:
+        component = tree.currentIndex().data(COMPONENT_ROLE)
+        if not isinstance(component, dict):
+            return False
+        mime_data = QMimeData()
+        mime_data.setData(
+            COMPONENT_MIME_TYPE,
+            QByteArray(json.dumps(component).encode("utf-8")),
+        )
+        QApplication.clipboard().setMimeData(mime_data)
+        return True
+
+    def _paste_into_document_tree(self) -> None:
+        index = self.ui.documentTreeView.currentIndex()
+        kind = index.data(ITEM_KIND_ROLE)
+        owner_id = None
+        if kind == "current-component":
+            component_id = index.data(COMPONENT_ID_ROLE)
+            component = (
+                self.document_controller.document.find_component(component_id)
+                if self.document_controller.document
+                else None
+            )
+            if component is None or component.implementation_kind != "graph":
+                QMessageBox.warning(
+                    self, "Cannot Paste", "Select a graph component or the document root."
+                )
+                return
+            owner_id = component.id
+        elif kind != "current-document":
+            QMessageBox.warning(
+                self, "Cannot Paste", "Select a graph component or the document root."
+            )
+            return
+        try:
+            components, connections = self._clipboard_components()
+            self.document_controller.paste_components_to(
+                owner_id, components, connections
+            )
+        except ValueError as error:
+            QMessageBox.warning(self, "Cannot Paste", str(error))
+
+    @staticmethod
+    def _clipboard_components() -> tuple[list[Component], list]:
+        mime_data = QApplication.clipboard().mimeData()
+        try:
+            if mime_data.hasFormat(SELECTION_MIME_TYPE):
+                payload = json.loads(
+                    bytes(mime_data.data(SELECTION_MIME_TYPE)).decode("utf-8")
+                )
+                return (
+                    [Component.from_dict(item) for item in payload.get("components", [])],
+                    [Connection.from_dict(item) for item in payload.get("connections", [])],
+                )
+            if mime_data.hasFormat(COMPONENT_MIME_TYPE):
+                payload = json.loads(
+                    bytes(mime_data.data(COMPONENT_MIME_TYPE)).decode("utf-8")
+                )
+                return [Component.from_dict(payload)], []
+        except (KeyError, TypeError, ValueError, json.JSONDecodeError) as error:
+            raise ValueError("The clipboard does not contain a valid component") from error
+        raise ValueError("The clipboard does not contain a BEdit component")
+
+    @staticmethod
+    def _view_has_focus(view) -> bool:
+        focus = QApplication.focusWidget()
+        return focus is view or (focus is not None and view.isAncestorOf(focus))
+
     @Slot()
     def navigate_up(self) -> None:
         if self._resolve_source_edits():
@@ -361,6 +537,8 @@ class MainWindow(QMainWindow):
         if component is None:
             return
         self.ui.textDefinitionEditor.set_definition(
+            component.source.get("declarations", ""),
+            component.source.get("initialEquations", ""),
             component.source.get("equations", ""),
             component.inputs,
             component.outputs,
@@ -378,7 +556,8 @@ class MainWindow(QMainWindow):
         answer = QMessageBox.question(
             self,
             "Apply text component changes?",
-            "The text component has unapplied equation, port, or parameter changes.",
+            "The text component has unapplied declaration, initial-equation, "
+            "equation, port, or parameter changes.",
             QMessageBox.StandardButton.Apply
             | QMessageBox.StandardButton.Discard
             | QMessageBox.StandardButton.Cancel,
@@ -396,6 +575,8 @@ class MainWindow(QMainWindow):
                 self.document_controller.replace_active_text_definition(
                     inputs,
                     outputs,
+                    self.ui.textDefinitionEditor.declarations,
+                    self.ui.textDefinitionEditor.initial_equations,
                     self.ui.textDefinitionEditor.equations,
                     self.ui.textDefinitionEditor.parameters,
                 )
@@ -528,6 +709,8 @@ class MainWindow(QMainWindow):
         if scene is not None:
             scene.update()
         self.ui.graphView.viewport().update()
+        self.ui.textDefinitionEditor.ui.declarationsEdit.reload_highlighting()
+        self.ui.textDefinitionEditor.ui.initialEquationsEdit.reload_highlighting()
         self.ui.textDefinitionEditor.ui.equationsEdit.reload_highlighting()
 
     def _document_opened_changed(self, opened: bool) -> None:
@@ -547,6 +730,8 @@ class MainWindow(QMainWindow):
     def show_library_context_menu(self, position) -> None:
         tree_view = self.ui.documentTreeView
         index = tree_view.indexAt(position)
+        if index.isValid():
+            tree_view.setCurrentIndex(index)
         kind = index.data(ITEM_KIND_ROLE)
         if kind == "current-component":
             component_id = index.data(COMPONENT_ID_ROLE)
@@ -564,6 +749,11 @@ class MainWindow(QMainWindow):
             options_action = menu.addAction("Component Options…")
             ports_action = menu.addAction("Port Options…")
             parameters_action = menu.addAction("Parameter Options…")
+            menu.addSeparator()
+            copy_action = menu.addAction("Copy")
+            cut_action = menu.addAction("Cut")
+            paste_action = menu.addAction("Paste")
+            paste_action.setEnabled(component.implementation_kind == "graph")
             delete_action = menu.addAction("Delete")
             selected = menu.exec(tree_view.viewport().mapToGlobal(position))
             if graph_action is not None and selected is graph_action:
@@ -576,6 +766,13 @@ class MainWindow(QMainWindow):
                 self.show_component_port_options(component_id)
             elif selected is parameters_action:
                 self.show_component_parameter_options(component_id)
+            elif selected is copy_action:
+                self._copy_tree_component(tree_view)
+            elif selected is cut_action:
+                if self._copy_tree_component(tree_view):
+                    self.document_controller.delete_component(component_id)
+            elif selected is paste_action:
+                self._paste_into_document_tree()
             elif selected is delete_action:
                 answer = QMessageBox.question(
                     self,
@@ -591,24 +788,34 @@ class MainWindow(QMainWindow):
         menu = QMenu(self)
         graph_action = menu.addAction("New Graph Block")
         text_action = menu.addAction("New Text Block")
+        menu.addSeparator()
+        paste_action = menu.addAction("Paste")
         selected = menu.exec(tree_view.viewport().mapToGlobal(position))
         if selected is graph_action:
             self.document_controller.add_root("graph")
         elif selected is text_action:
             self.document_controller.add_root("text")
+        elif selected is paste_action:
+            self._paste_into_document_tree()
 
     @Slot(object)
     def show_external_library_context_menu(self, position) -> None:
         tree = self.ui.treeView
         index = tree.indexAt(position)
+        if index.isValid():
+            tree.setCurrentIndex(index)
         component = index.data(COMPONENT_INSTANCE_ROLE)
         if not isinstance(component, Component):
             return
         menu = QMenu(self)
+        copy_action = menu.addAction("Copy")
+        menu.addSeparator()
         ports_action = menu.addAction("Port Options…")
         parameters_action = menu.addAction("Parameter Options…")
         selected = menu.exec(tree.viewport().mapToGlobal(position))
-        if selected is ports_action:
+        if selected is copy_action:
+            self._copy_tree_component(tree)
+        elif selected is ports_action:
             dialog = PortOptionsDialog(component, self)
             if dialog.exec() == dialog.DialogCode.Accepted:
                 old_inputs, old_outputs = deepcopy(component.inputs), deepcopy(component.outputs)
@@ -760,6 +967,8 @@ class MainWindow(QMainWindow):
             event.ignore()
             return
         self.settings.setValue("window/geometry", self.saveGeometry())
+        self._simulation_window.close()
+        self.simulation.shutdown()
         self.log.info("BEdit closed")
         self.application_logger.removeHandler(self.log_handler)
         event.accept()

BEdit/src/bedit/gui/simulation_reload.py

@@ -20,6 +20,8 @@ def _saved_instance_state(instance) -> dict:
 def reload_simulation(current):
     """Reload the simulation package and return a fresh state-preserving instance."""
     saved_state = _saved_instance_state(current)
+    saved_state.pop("openmodelica", None)
+    current.shutdown(wait=True)
     importlib.invalidate_caches()
     package = importlib.import_module(SIMULATION_PACKAGE)
     discovered: list[ModuleType] = []
@@ -30,4 +32,5 @@ def reload_simulation(current):
     package = importlib.reload(package)
     replacement = package.Simulation()
     vars(replacement).update(saved_state)
+    replacement.openmodelica.configure(replacement.openmodelica_path)
     return replacement

BEdit/src/bedit/gui/simulation_window.py

@@ -0,0 +1,726 @@
+import re
+from pathlib import Path
+
+from matplotlib.backend_bases import MouseButton
+from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg, NavigationToolbar2QT
+from matplotlib.figure import Figure
+from PySide6.QtCore import Qt, Signal
+from PySide6.QtGui import QCloseEvent
+from PySide6.QtWidgets import (
+    QFileDialog,
+    QInputDialog,
+    QMainWindow,
+    QMenu,
+    QMessageBox,
+    QTreeWidgetItem,
+    QVBoxLayout,
+    QWidget,
+)
+
+from bedit.core.simulation.openmodelica import SimulationMessage, SimulationProgress
+from bedit.core.simulation.results import (
+    SimulationExecutionResult,
+    SimulationGraph,
+    SimulationResults,
+    SimulationTrace,
+    load_simulation_results,
+    save_simulation_results,
+)
+from bedit.gui.generated.ui_simulation_window import Ui_SimulationWindow
+from bedit.gui.preferences import application_settings
+
+
+class SimulationWindow(QMainWindow):
+    """Persistent viewer for live and previously saved simulation results."""
+
+    progressReceived = Signal(object)
+    messageReceived = Signal(object)
+    simulationFinished = Signal(object)
+    simulationFailed = Signal(str)
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(parent)
+        self.ui = Ui_SimulationWindow()
+        self.ui.setupUi(self)
+        self.settings = application_settings()
+        self._running = False
+        self._run_generation = 0
+        self._file_path: Path | None = None
+        self._rebuilding_graph_tabs = False
+        self._updating_signal_checks = False
+        self.results = SimulationResults()
+        self._connect_actions()
+        self._populate_view_menu()
+        self.splitDockWidget(
+            self.ui.statusDock, self.ui.logDock, Qt.Orientation.Vertical
+        )
+        self.ui.statusDock.setFixedHeight(self.ui.statusDock.sizeHint().height())
+        self._restore_window_layout()
+        self.progressReceived.connect(self._show_progress)
+        self.messageReceived.connect(self._show_message)
+        self.simulationFinished.connect(self._show_finished)
+        self.simulationFailed.connect(self._show_error)
+
+    def _connect_actions(self) -> None:
+        self.ui.actionOpen.triggered.connect(self.open_results)
+        self.ui.actionSave.triggered.connect(self.save_results)
+        self.ui.actionSaveAs.triggered.connect(self.save_results_as)
+        self.ui.actionClear.triggered.connect(self.clear)
+        self.ui.actionExit.triggered.connect(self.close)
+        self.ui.actionAbout.triggered.connect(self.show_about)
+        self.ui.actionAboutQt.triggered.connect(
+            lambda: QMessageBox.aboutQt(self, "About Qt Framework")
+        )
+        self.ui.actionToggleResults.toggled.connect(self.ui.centralWidget.setVisible)
+        self.ui.actionAddGraph.triggered.connect(self.add_graph_tab)
+        self.ui.actionRemoveGraph.triggered.connect(self.remove_current_graph_tab)
+        self.ui.graphTabs.tabBarDoubleClicked.connect(self.rename_graph_tab)
+        self.ui.graphTabs.tabBar().tabMoved.connect(self._move_graph_tab)
+        self.ui.graphTabs.currentChanged.connect(self._current_graph_changed)
+        self.ui.signalsTree.itemChanged.connect(self._signal_check_changed)
+        self.ui.signalsTree.customContextMenuRequested.connect(
+            self.show_signal_context_menu
+        )
+
+    def _populate_view_menu(self) -> None:
+        self.ui.menuPanels.addAction(self.ui.actionToggleResults)
+        for panel in (self.ui.statusDock, self.ui.logDock, self.ui.signalsDock):
+            self.ui.menuPanels.addAction(panel.toggleViewAction())
+        self.ui.menuToolbars.addAction(self.ui.fileToolbar.toggleViewAction())
+        self.ui.menuToolbars.addAction(self.ui.workspaceToolbar.toggleViewAction())
+
+    def _restore_window_layout(self) -> None:
+        geometry = self.settings.value("simulationWindow/geometry")
+        if geometry is not None:
+            self.restoreGeometry(geometry)
+        state = self.settings.value("simulationWindow/state")
+        if state is not None:
+            self.restoreState(state)
+        results_visible = self.settings.value(
+            "simulationWindow/resultsVisible", True, type=bool
+        )
+        self.ui.actionToggleResults.setChecked(results_visible)
+
+    def _save_window_layout(self) -> None:
+        self.settings.setValue("simulationWindow/geometry", self.saveGeometry())
+        self.settings.setValue("simulationWindow/state", self.saveState())
+        self.settings.setValue(
+            "simulationWindow/resultsVisible",
+            self.ui.actionToggleResults.isChecked(),
+        )
+        self.settings.sync()
+
+    def begin_run(self) -> tuple:
+        """Reset transient run state while retaining the current workspace."""
+
+        self._run_generation += 1
+        generation = self._run_generation
+        self._running = True
+        self._file_path = None
+        self.results.status = {}
+        self.results.messages.clear()
+        self.results.metadata.clear()
+        self.ui.progressBar.setValue(0)
+        self.ui.timeLabel.setText("Time: 0 s")
+        self.ui.messageList.clear()
+        self.ui.statusLabel.setText("Preparing simulation…")
+        return (
+            lambda progress: self._report_progress(generation, progress),
+            lambda message: self._report_message(generation, message),
+            lambda result: self._report_finished(generation, result),
+            lambda error: self._report_error(generation, error),
+        )
+
+    def prepare_run_model(self, model_name: str | None) -> None:
+        """Retain graph configuration only when rerunning the same model."""
+
+        if not model_name:
+            return
+        if self.results.model_name != model_name:
+            self.results = SimulationResults(model_name=model_name)
+            self.clear_result_views()
+            self.load_result_views()
+        else:
+            self.results.model_name = model_name
+        self.ui.statusLabel.setText("Preparing simulation…")
+        self._update_title()
+
+    def clear(self, checked: bool = False, *, model_name: str = "") -> None:
+        """Discard the displayed run and prepare an empty results document."""
+
+        del checked
+        self._run_generation += 1
+        self._running = False
+        self._file_path = None
+        self.results = SimulationResults(model_name=model_name)
+        self.ui.statusLabel.setText("No simulation has been run yet.")
+        self.ui.progressBar.setValue(0)
+        self.ui.timeLabel.setText("Time: 0 s")
+        self.ui.messageList.clear()
+        self.clear_result_views()
+        self.load_result_views()
+        self._update_title()
+
+    def clear_result_views(self) -> None:
+        """Clear custom plots before a run or loaded document is displayed.
+
+        Future graph widgets should be placed in the Designer-owned
+        ``resultsLayout`` and reset here.
+        """
+
+        self._rebuilding_graph_tabs = True
+        self._clear_graph_tab_widgets()
+        self._rebuilding_graph_tabs = False
+        self.ui.signalsTree.clear()
+
+    def load_result_views(self) -> None:
+        """Populate custom plots from ``self.results.data`` and traces.
+
+        This is the intended integration point for a future plotting widget.
+        """
+
+        self._rebuild_graph_tabs()
+        self._rebuild_signal_tree()
+
+    def _rebuild_graph_tabs(self) -> None:
+        current_page = self.ui.graphTabs.currentWidget()
+        current_graph_id = (
+            current_page.graph_id
+            if isinstance(current_page, GraphWorkspacePage)
+            else None
+        )
+        self._rebuilding_graph_tabs = True
+        self._clear_graph_tab_widgets()
+        for graph in self.results.graphs:
+            self.ui.graphTabs.addTab(
+                GraphWorkspacePage(graph, self.results), graph.title
+            )
+        if current_graph_id is not None:
+            for index, graph in enumerate(self.results.graphs):
+                if graph.id == current_graph_id:
+                    self.ui.graphTabs.setCurrentIndex(index)
+                    break
+        self._rebuilding_graph_tabs = False
+        self._update_graph_actions()
+        self._sync_signal_checks()
+
+    def _clear_graph_tab_widgets(self) -> None:
+        while self.ui.graphTabs.count():
+            page = self.ui.graphTabs.widget(0)
+            self.ui.graphTabs.removeTab(0)
+            page.deleteLater()
+
+    def add_graph_tab(self) -> None:
+        used_titles = {graph.title for graph in self.results.graphs}
+        number = 1
+        while f"Graph {number}" in used_titles:
+            number += 1
+        graph = SimulationGraph(title=f"Graph {number}")
+        self.results.graphs.append(graph)
+        index = self.ui.graphTabs.addTab(
+            GraphWorkspacePage(graph, self.results), graph.title
+        )
+        self.ui.graphTabs.setCurrentIndex(index)
+        self._update_graph_actions()
+
+    def remove_current_graph_tab(self) -> None:
+        index = self.ui.graphTabs.currentIndex()
+        if index < 0 or index >= len(self.results.graphs):
+            return
+        self.results.graphs.pop(index)
+        page = self.ui.graphTabs.widget(index)
+        self.ui.graphTabs.removeTab(index)
+        page.deleteLater()
+        self._update_graph_actions()
+        self._sync_signal_checks()
+
+    def rename_graph_tab(self, index: int) -> None:
+        if index < 0 or index >= len(self.results.graphs):
+            return
+        graph = self.results.graphs[index]
+        title, accepted = QInputDialog.getText(
+            self, "Rename Graph", "Title:", text=graph.title
+        )
+        title = title.strip()
+        if accepted and title:
+            graph.title = title
+            self.ui.graphTabs.setTabText(index, title)
+            page = self.ui.graphTabs.widget(index)
+            if isinstance(page, GraphWorkspacePage):
+                page.refresh_chart()
+
+    def _move_graph_tab(self, old_index: int, new_index: int) -> None:
+        if self._rebuilding_graph_tabs or old_index == new_index:
+            return
+        graph = self.results.graphs.pop(old_index)
+        self.results.graphs.insert(new_index, graph)
+        self._sync_signal_checks()
+
+    def _update_graph_actions(self) -> None:
+        self.ui.actionRemoveGraph.setEnabled(bool(self.results.graphs))
+
+    def _rebuild_signal_tree(self) -> None:
+        """Build a hierarchy while retaining each leaf's complete signal name."""
+
+        tree = self.ui.signalsTree
+        self._updating_signal_checks = True
+        try:
+            tree.clear()
+            items: dict[tuple[str, ...], QTreeWidgetItem] = {}
+            for signal_name in sorted(self.results.data, key=str.casefold):
+                parts = _signal_tree_parts(signal_name)
+                if not parts:
+                    continue
+                parent = tree.invisibleRootItem()
+                for depth, part in enumerate(parts, start=1):
+                    path = parts[:depth]
+                    item = items.get(path)
+                    if item is None:
+                        item = QTreeWidgetItem(parent, [part])
+                        items[path] = item
+                    parent = item
+                parent.setData(0, Qt.ItemDataRole.UserRole, signal_name)
+                parent.setToolTip(0, signal_name)
+                parent.setFlags(parent.flags() | Qt.ItemFlag.ItemIsUserCheckable)
+                parent.setCheckState(0, Qt.CheckState.Unchecked)
+            tree.expandToDepth(0)
+        finally:
+            self._updating_signal_checks = False
+        self._sync_signal_checks()
+
+    def _current_graph_changed(self, _index: int) -> None:
+        if not self._rebuilding_graph_tabs:
+            self._sync_signal_checks()
+
+    def _current_graph(self) -> SimulationGraph | None:
+        index = self.ui.graphTabs.currentIndex()
+        if 0 <= index < len(self.results.graphs):
+            return self.results.graphs[index]
+        return None
+
+    def _sync_signal_checks(self) -> None:
+        graph = self._current_graph()
+        enabled = {trace.name for trace in graph.traces} if graph else set()
+        self._updating_signal_checks = True
+        try:
+            root = self.ui.signalsTree.invisibleRootItem()
+            pending = [root.child(index) for index in range(root.childCount())]
+            while pending:
+                item = pending.pop()
+                pending.extend(
+                    item.child(index) for index in range(item.childCount())
+                )
+                signal_name = item.data(0, Qt.ItemDataRole.UserRole)
+                if isinstance(signal_name, str):
+                    item.setCheckState(
+                        0,
+                        Qt.CheckState.Checked
+                        if signal_name in enabled
+                        else Qt.CheckState.Unchecked,
+                    )
+        finally:
+            self._updating_signal_checks = False
+        self.ui.signalsTree.setEnabled(graph is not None)
+
+    def _signal_check_changed(self, item: QTreeWidgetItem, _column: int) -> None:
+        if self._updating_signal_checks:
+            return
+        signal_name = item.data(0, Qt.ItemDataRole.UserRole)
+        graph = self._current_graph()
+        if not isinstance(signal_name, str) or graph is None:
+            return
+        enabled = item.checkState(0) == Qt.CheckState.Checked
+        existing = next(
+            (trace for trace in graph.traces if trace.name == signal_name), None
+        )
+        if enabled and existing is None:
+            graph.traces.append(SimulationTrace(name=signal_name))
+        elif not enabled and existing is not None:
+            graph.traces.remove(existing)
+        page = self.ui.graphTabs.currentWidget()
+        if isinstance(page, GraphWorkspacePage):
+            page.refresh_chart()
+
+    def selected_signal_names(self) -> list[str]:
+        """Return full column names selected for future plotting actions."""
+
+        names = []
+        for item in self.ui.signalsTree.selectedItems():
+            name = item.data(0, Qt.ItemDataRole.UserRole)
+            if isinstance(name, str):
+                names.append(name)
+        return names
+
+    def show_signal_context_menu(self, position) -> None:
+        item = self.ui.signalsTree.itemAt(position)
+        signal_name = (
+            item.data(0, Qt.ItemDataRole.UserRole) if item is not None else None
+        )
+        graph = self._current_graph()
+        if not isinstance(signal_name, str) or graph is None:
+            return
+        menu = QMenu(self)
+        use_as_x_action = menu.addAction("Use as X Axis")
+        use_as_x_action.setCheckable(True)
+        use_as_x_action.setChecked(graph.x_axis == signal_name)
+        selected = menu.exec(
+            self.ui.signalsTree.viewport().mapToGlobal(position)
+        )
+        if selected is use_as_x_action:
+            self.set_x_axis_signal(signal_name)
+
+    def set_x_axis_signal(self, signal_name: str) -> None:
+        """Set the current graph's persisted horizontal data column."""
+
+        graph = self._current_graph()
+        if graph is None or signal_name not in self.results.data:
+            return
+        graph.x_axis = signal_name
+        page = self.ui.graphTabs.currentWidget()
+        if isinstance(page, GraphWorkspacePage):
+            page.refresh_chart()
+
+    def open_results(self) -> None:
+        file_name, _selected_filter = QFileDialog.getOpenFileName(
+            self,
+            "Open Simulation Results",
+            "",
+            "BEdit Binary Simulation Results (*.ber);;JSON Simulation Results (*.json)",
+        )
+        if not file_name:
+            return
+        try:
+            results = load_simulation_results(file_name)
+        except ValueError as error:
+            QMessageBox.warning(self, "Cannot Open Simulation Results", str(error))
+            return
+        self._run_generation += 1
+        self._running = False
+        self._file_path = Path(file_name)
+        self.results = results
+        self._display_results()
+
+    def save_results(self) -> None:
+        file_path = self._file_path
+        if file_path is None:
+            self.save_results_as()
+            return
+        self._save_results_to(file_path)
+
+    def save_results_as(self) -> None:
+        default_name = f"{_safe_file_stem(self.results.model_name)}-results.ber"
+        file_name, selected_filter = QFileDialog.getSaveFileName(
+            self,
+            "Save Simulation Results As",
+            default_name,
+            "BEdit Binary Simulation Results (*.ber);;JSON Simulation Results (*.json)",
+        )
+        if not file_name:
+            return
+        file_path = Path(file_name)
+        if file_path.suffix.lower() not in {".ber", ".json"}:
+            suffix = ".json" if selected_filter.startswith("JSON") else ".ber"
+            file_path = file_path.with_suffix(suffix)
+        self._save_results_to(file_path)
+
+    def _save_results_to(self, file_path: Path) -> None:
+        try:
+            save_simulation_results(file_path, self.results)
+        except OSError as error:
+            QMessageBox.warning(self, "Cannot Save Simulation Results", str(error))
+            return
+        self._file_path = file_path
+        self._update_title()
+
+    def _display_results(self) -> None:
+        status = self.results.status
+        self.ui.statusLabel.setText(str(status.get("phase", "Loaded results")))
+        self.ui.progressBar.setValue(int(status.get("progress", 0)))
+        self.ui.timeLabel.setText(f"Time: {float(status.get('time', 0)):g} s")
+        self.ui.messageList.clear()
+        for message in self.results.messages:
+            prefix = message.get("stream") or message.get("type") or "OpenModelica"
+            self.ui.messageList.addItem(f"{prefix}: {message.get('text', '')}")
+        self.clear_result_views()
+        self.load_result_views()
+        self._update_title()
+
+    def _update_title(self) -> None:
+        name = self.results.model_name or "Simulation"
+        self.setWindowTitle(f"{name} — Simulation")
+
+    def _report_progress(self, generation: int, progress: SimulationProgress) -> None:
+        if generation == self._run_generation:
+            self.progressReceived.emit(progress)
+
+    def _report_message(self, generation: int, message: SimulationMessage) -> None:
+        if generation == self._run_generation:
+            self.messageReceived.emit(message)
+
+    def _report_finished(self, generation: int, result) -> None:
+        if generation == self._run_generation:
+            self.simulationFinished.emit(result)
+
+    def _report_error(self, generation: int, error: Exception) -> None:
+        if generation == self._run_generation:
+            self.simulationFailed.emit(str(error))
+
+    def report_start_error(self, error: Exception) -> None:
+        self.simulationFailed.emit(str(error))
+
+    def _show_progress(self, progress: SimulationProgress) -> None:
+        self.results.status = {
+            "phase": progress.phase,
+            "currentStepSize": progress.current_step_size,
+            "time": progress.time,
+            "progress": progress.progress,
+        }
+        self.ui.statusLabel.setText(progress.phase or "Running")
+        self.ui.timeLabel.setText(f"Time: {progress.time:g} s")
+        self.ui.progressBar.setValue(max(0, min(10000, progress.progress)))
+
+    def _show_message(self, message: SimulationMessage) -> None:
+        self.results.messages.append(
+            {"stream": message.stream, "type": message.type, "text": message.text}
+        )
+        prefix = message.stream or message.type or "OpenModelica"
+        self.ui.messageList.addItem(f"{prefix}: {message.text}")
+        self.ui.messageList.scrollToBottom()
+
+    def _show_finished(self, result) -> None:
+        self._running = False
+        self.results.status.update(phase="Simulation finished", progress=10000)
+        if isinstance(result, SimulationExecutionResult):
+            self.results.data = result.data
+            available_signals = set(result.data)
+            for graph in self.results.graphs:
+                graph.traces = [
+                    trace
+                    for trace in graph.traces
+                    if trace.name in available_signals
+                ]
+                if graph.x_axis not in available_signals:
+                    graph.x_axis = (
+                        "time"
+                        if "time" in available_signals
+                        else next(iter(result.data), "")
+                    )
+            self.results.metadata["processReturnCode"] = result.return_code
+            self.results.metadata["sourceResultFile"] = Path(result.result_file).name
+        else:
+            self.results.metadata["processResult"] = result
+        self.ui.progressBar.setValue(10000)
+        self.ui.statusLabel.setText("Simulation finished")
+        self.load_result_views()
+
+    def _show_error(self, message: str) -> None:
+        self._running = False
+        self.results.status["phase"] = "Simulation failed"
+        self.results.messages.append(
+            {"stream": "BEdit", "type": "error", "text": message}
+        )
+        self.ui.statusLabel.setText("Simulation failed")
+        self.ui.messageList.addItem(f"Error: {message}")
+
+    def show_about(self) -> None:
+        QMessageBox.about(
+            self,
+            "About BEdit Simulation",
+            "<h3>BEdit Simulation</h3>"
+            "<p>View live progress and open or save simulation results.</p>",
+        )
+
+    def closeEvent(self, event: QCloseEvent) -> None:  # noqa: N802 (Qt API name)
+        self._save_window_layout()
+        super().closeEvent(event)
+
+    @property
+    def is_running(self) -> bool:
+        return self._running
+
+
+class GraphWorkspacePage(QWidget):
+    """Matplotlib view of one persisted simulation graph definition."""
+
+    def __init__(
+        self, graph: SimulationGraph, results: SimulationResults, parent=None
+    ) -> None:
+        super().__init__(parent)
+        self.graph_id = graph.id
+        self.graph = graph
+        self.results = results
+        self.plot_layout = QVBoxLayout(self)
+        self.figure = Figure(layout="constrained")
+        self.canvas = InteractiveFigureCanvas(self.figure)
+        self.axes = self.figure.add_subplot(111)
+        self.canvas.axes = self.axes
+        self.navigation_toolbar = GraphNavigationToolbar(self.canvas, self)
+        self.canvas.navigation_toolbar = self.navigation_toolbar
+        self.plot_layout.addWidget(self.navigation_toolbar)
+        self.plot_layout.addWidget(self.canvas)
+        self.refresh_chart()
+
+    def refresh_chart(self) -> None:
+        self.axes.clear()
+        x_values = self.results.data.get(self.graph.x_axis)
+        for trace in self.graph.traces:
+            y_values = self.results.data.get(trace.name)
+            if y_values is None:
+                continue
+            horizontal = x_values if x_values is not None else range(len(y_values))
+            sample_count = min(len(horizontal), len(y_values))
+            color = trace.properties.get("color")
+            self.axes.plot(
+                list(horizontal)[:sample_count],
+                y_values[:sample_count],
+                label=trace.name,
+                color=color if isinstance(color, str) and color else None,
+            )
+        self.axes.set_title(self.graph.title)
+        self.axes.set_xlabel(self.graph.x_axis if x_values is not None else "sample")
+        self.axes.grid(True, alpha=0.25)
+        if self.axes.lines:
+            self.axes.legend()
+        self.axes.relim()
+        self.axes.autoscale_view()
+        self.canvas.set_home_view()
+        self.canvas.draw_idle()
+
+
+class GraphNavigationToolbar(NavigationToolbar2QT):
+    """Navigation toolbar whose Home action includes direct canvas navigation."""
+
+    def home(self, *args) -> None:
+        del args
+        self.canvas.reset_home_view()
+
+
+class InteractiveFigureCanvas(FigureCanvasQTAgg):
+    """Matplotlib canvas with always-available wheel zoom and drag pan."""
+
+    def __init__(self, figure: Figure) -> None:
+        super().__init__(figure)
+        self.axes = None
+        self.navigation_toolbar = None
+        self._pan_start = None
+        self._home_view = None
+        self.mpl_connect("scroll_event", self._zoom_at_cursor)
+        self.mpl_connect("button_press_event", self._start_pan)
+        self.mpl_connect("motion_notify_event", self._pan)
+        self.mpl_connect("button_release_event", self._finish_pan)
+
+    def _toolbar_is_active(self) -> bool:
+        return bool(
+            self.navigation_toolbar is not None
+            and self.navigation_toolbar.mode
+        )
+
+    def set_home_view(self) -> None:
+        if self.axes is not None:
+            self._home_view = (self.axes.get_xlim(), self.axes.get_ylim())
+
+    def reset_home_view(self) -> None:
+        if self.axes is None or self._home_view is None:
+            return
+        x_limits, y_limits = self._home_view
+        self.axes.set_xlim(x_limits)
+        self.axes.set_ylim(y_limits)
+        self.draw_idle()
+
+    def _zoom_at_cursor(self, event) -> None:
+        if (
+            self.axes is None
+            or event.inaxes is not self.axes
+            or event.xdata is None
+            or event.ydata is None
+            or self._toolbar_is_active()
+        ):
+            return
+        scale = 0.8 if event.button == "up" else 1.25
+        left, right = self.axes.get_xlim()
+        bottom, top = self.axes.get_ylim()
+        self.axes.set_xlim(
+            event.xdata - (event.xdata - left) * scale,
+            event.xdata + (right - event.xdata) * scale,
+        )
+        self.axes.set_ylim(
+            event.ydata - (event.ydata - bottom) * scale,
+            event.ydata + (top - event.ydata) * scale,
+        )
+        self.draw_idle()
+
+    def _start_pan(self, event) -> None:
+        if (
+            self.axes is None
+            or event.inaxes is not self.axes
+            or event.button != MouseButton.LEFT
+            or self._toolbar_is_active()
+        ):
+            return
+        self._pan_start = (
+            event.x,
+            event.y,
+            self.axes.get_xlim(),
+            self.axes.get_ylim(),
+        )
+
+    def _pan(self, event) -> None:
+        if (
+            self.axes is None
+            or self._pan_start is None
+            or event.x is None
+            or event.y is None
+        ):
+            return
+        start_x, start_y, x_limits, y_limits = self._pan_start
+        width = max(self.axes.bbox.width, 1.0)
+        height = max(self.axes.bbox.height, 1.0)
+        delta_x = (event.x - start_x) * (x_limits[1] - x_limits[0]) / width
+        delta_y = (event.y - start_y) * (y_limits[1] - y_limits[0]) / height
+        self.axes.set_xlim(x_limits[0] - delta_x, x_limits[1] - delta_x)
+        self.axes.set_ylim(y_limits[0] - delta_y, y_limits[1] - delta_y)
+        self.draw_idle()
+
+    def _finish_pan(self, _event) -> None:
+        self._pan_start = None
+
+
+def _safe_file_stem(model_name: str) -> str:
+    stem = re.sub(r"[^A-Za-z0-9_.-]+", "_", model_name).strip("._")
+    return stem or "simulation"
+
+
+def _signal_tree_parts(signal_name: str) -> tuple[str, ...]:
+    """Split a result name into readable component, variable, and index levels.
+
+    OpenModelica emits state derivatives as names such as ``der(block.x)``.
+    Keep those traces available, but display them below a ``Derivatives`` group
+    on their owning component instead of creating a misleading top-level
+    ``der(block`` branch.
+    """
+
+    derivative = re.fullmatch(r"der\((.+)\)", signal_name)
+    if derivative is not None:
+        inner_name = derivative.group(1)
+        inner_parts = _signal_tree_parts(inner_name)
+        if inner_parts:
+            index_count = len(re.findall(r"\[[^\]]+\]", inner_name.rsplit(".", 1)[-1]))
+            variable_index = max(0, len(inner_parts) - index_count - 1)
+            return (
+                *inner_parts[:variable_index],
+                "Derivatives",
+                *inner_parts[variable_index:],
+            )
+        return ("Derivatives", signal_name)
+
+    parts: list[str] = []
+    for segment in signal_name.split("."):
+        if not segment:
+            continue
+        match = re.fullmatch(r"([^\[]+)((?:\[[^\]]+\])+)", segment)
+        if match is None:
+            parts.append(segment)
+            continue
+        parts.append(match.group(1))
+        parts.extend(re.findall(r"\[([^\]]+)\]", match.group(2)))
+    return tuple(parts)

BEdit/ui/main_window.ui

@@ -551,7 +551,9 @@
     </property>
     <addaction name="actionSimulationSettings"/>
     <addaction name="actionGraphParameters"/>
-    <addaction name="actionCompile"/>
+    <addaction name="actionCompose"/>
+    <addaction name="actionExportModel"/>
+    <addaction name="actionSimulationWindow"/>
     <addaction name="actionRunSimulation"/>
    </widget>
    <addaction name="menuFile"/>
@@ -644,7 +646,8 @@
    </attribute>
    <addaction name="actionSimulationSettings"/>
    <addaction name="actionGraphParameters"/>
-   <addaction name="actionCompile"/>
+   <addaction name="actionCompose"/>
+   <addaction name="actionSimulationWindow"/>
    <addaction name="actionRunSimulation"/>
   </widget>
   <action name="actionSimulationSettings">
@@ -662,7 +665,7 @@
   <action name="actionGraphParameters">
    <property name="icon">
     <iconset resource="../resources/resources.qrc">
-     <normaloff>:/icons/icons/configure.png</normaloff>:/icons/icons/configure.png</iconset>
+     <normaloff>:/icons/icons/view-form-table.png</normaloff>:/icons/icons/view-form-table.png</iconset>
    </property>
    <property name="text">
     <string>Graph Parameters</string>
@@ -671,16 +674,16 @@
     <string>Edit parameters throughout the active graph</string>
    </property>
   </action>
-  <action name="actionCompile">
+  <action name="actionCompose">
    <property name="icon">
     <iconset resource="../resources/resources.qrc">
      <normaloff>:/icons/icons/run-build.png</normaloff>:/icons/icons/run-build.png</iconset>
    </property>
    <property name="text">
-    <string>Compile</string>
+    <string>Compose</string>
    </property>
    <property name="statusTip">
-    <string>Compile the active graph for simulation</string>
+    <string>Compose the active graph as an OpenModelica model</string>
    </property>
    <property name="shortcut">
     <string>F5</string>
@@ -701,6 +704,30 @@
     <string>F6</string>
    </property>
   </action>
+  <action name="actionSimulationWindow">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/office-chart-line.png</normaloff>:/icons/icons/office-chart-line.png</iconset>
+   </property>
+   <property name="text">
+    <string>Simulation Window</string>
+   </property>
+   <property name="statusTip">
+    <string>Show the simulation results window</string>
+   </property>
+  </action>
+  <action name="actionExportModel">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/document-save-as.png</normaloff>:/icons/icons/document-save-as.png</iconset>
+   </property>
+   <property name="text">
+    <string>Export Model…</string>
+   </property>
+   <property name="statusTip">
+    <string>Save the composed OpenModelica model to a file</string>
+   </property>
+  </action>
   <action name="actionNew">
    <property name="icon">
     <iconset resource="../resources/resources.qrc">

BEdit/ui/simulation_window.ui

@@ -0,0 +1,322 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SimulationWindow</class>
+ <widget class="QMainWindow" name="SimulationWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>900</width>
+    <height>650</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Simulation</string>
+  </property>
+  <property name="windowIcon">
+   <iconset resource="../resources/resources.qrc">
+    <normaloff>:/icons/icons/office-chart-line.png</normaloff>:/icons/icons/office-chart-line.png</iconset>
+  </property>
+  <widget class="QWidget" name="centralWidget">
+   <layout class="QVBoxLayout" name="resultsLayout">
+    <item>
+     <widget class="QTabWidget" name="graphTabs">
+      <property name="tabsClosable">
+       <bool>false</bool>
+      </property>
+      <property name="movable">
+       <bool>true</bool>
+      </property>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menuBar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>900</width>
+     <height>24</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuFile">
+    <property name="title">
+     <string>&amp;File</string>
+    </property>
+    <addaction name="actionOpen"/>
+    <addaction name="actionSave"/>
+    <addaction name="actionSaveAs"/>
+    <addaction name="separator"/>
+    <addaction name="actionClear"/>
+    <addaction name="separator"/>
+    <addaction name="actionExit"/>
+   </widget>
+   <widget class="QMenu" name="menuView">
+    <property name="title">
+     <string>&amp;View</string>
+    </property>
+    <widget class="QMenu" name="menuPanels">
+     <property name="title">
+      <string>&amp;Panels</string>
+     </property>
+    </widget>
+    <widget class="QMenu" name="menuToolbars">
+     <property name="title">
+      <string>&amp;Toolbars</string>
+     </property>
+    </widget>
+    <addaction name="menuPanels"/>
+    <addaction name="menuToolbars"/>
+   </widget>
+   <widget class="QMenu" name="menuHelp">
+    <property name="title">
+     <string>&amp;Help</string>
+    </property>
+    <addaction name="actionAbout"/>
+    <addaction name="actionAboutQt"/>
+   </widget>
+   <widget class="QMenu" name="menuGraph">
+    <property name="title">
+     <string>&amp;Graph</string>
+    </property>
+    <addaction name="actionAddGraph"/>
+    <addaction name="actionRemoveGraph"/>
+   </widget>
+   <addaction name="menuFile"/>
+   <addaction name="menuView"/>
+   <addaction name="menuGraph"/>
+   <addaction name="menuHelp"/>
+  </widget>
+  <widget class="QToolBar" name="workspaceToolbar">
+   <property name="windowTitle">
+    <string>Workspace</string>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonStyle::ToolButtonIconOnly</enum>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionAddGraph"/>
+   <addaction name="actionRemoveGraph"/>
+  </widget>
+  <widget class="QToolBar" name="fileToolbar">
+   <property name="windowTitle">
+    <string>File</string>
+   </property>
+   <property name="toolButtonStyle">
+    <enum>Qt::ToolButtonStyle::ToolButtonIconOnly</enum>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+   <addaction name="actionClear"/>
+   <addaction name="actionOpen"/>
+   <addaction name="actionSave"/>
+   <addaction name="actionSaveAs"/>
+  </widget>
+  <widget class="QDockWidget" name="statusDock">
+   <property name="windowTitle">
+    <string>Status</string>
+   </property>
+   <attribute name="dockWidgetArea">
+    <number>8</number>
+   </attribute>
+   <widget class="QWidget" name="statusDockContents">
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLabel" name="timeLabel">
+       <property name="text">
+        <string>Time: 0 s</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QProgressBar" name="progressBar">
+       <property name="maximum">
+        <number>10000</number>
+       </property>
+       <property name="value">
+        <number>0</number>
+       </property>
+       <property name="format">
+        <string>%p%</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="statusLabel">
+       <property name="text">
+        <string>No simulation has been run yet.</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </widget>
+  </widget>
+  <widget class="QDockWidget" name="logDock">
+   <property name="floating">
+    <bool>false</bool>
+   </property>
+   <property name="features">
+    <set>QDockWidget::DockWidgetFeature::DockWidgetFloatable|QDockWidget::DockWidgetFeature::DockWidgetMovable</set>
+   </property>
+   <property name="windowTitle">
+    <string>Log</string>
+   </property>
+   <attribute name="dockWidgetArea">
+    <number>8</number>
+   </attribute>
+   <widget class="QWidget" name="logDockContents">
+    <layout class="QVBoxLayout" name="logLayout">
+     <item>
+      <widget class="QListWidget" name="messageList">
+       <property name="alternatingRowColors">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </widget>
+  </widget>
+  <widget class="QDockWidget" name="signalsDock">
+   <property name="windowTitle">
+    <string>Signals</string>
+   </property>
+   <attribute name="dockWidgetArea">
+    <number>2</number>
+   </attribute>
+   <widget class="QWidget" name="signalsDockContents">
+    <layout class="QVBoxLayout" name="signalsLayout">
+     <item>
+      <widget class="QTreeWidget" name="signalsTree">
+       <property name="contextMenuPolicy">
+        <enum>Qt::ContextMenuPolicy::CustomContextMenu</enum>
+       </property>
+       <property name="selectionMode">
+        <enum>QAbstractItemView::SelectionMode::ExtendedSelection</enum>
+       </property>
+       <property name="headerHidden">
+        <bool>true</bool>
+       </property>
+       <column>
+        <property name="text">
+         <string>Signal</string>
+        </property>
+       </column>
+      </widget>
+     </item>
+    </layout>
+   </widget>
+  </widget>
+  <action name="actionOpen">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/document-open.png</normaloff>:/icons/icons/document-open.png</iconset>
+   </property>
+   <property name="text">
+    <string>&amp;Open…</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+O</string>
+   </property>
+  </action>
+  <action name="actionSave">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/document-save.png</normaloff>:/icons/icons/document-save.png</iconset>
+   </property>
+   <property name="text">
+    <string>&amp;Save…</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+S</string>
+   </property>
+  </action>
+  <action name="actionClear">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/document-new.png</normaloff>:/icons/icons/document-new.png</iconset>
+   </property>
+   <property name="text">
+    <string>&amp;Clear</string>
+   </property>
+  </action>
+  <action name="actionSaveAs">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/document-save-as.png</normaloff>:/icons/icons/document-save-as.png</iconset>
+   </property>
+   <property name="text">
+    <string>Save &amp;As…</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+Shift+S</string>
+   </property>
+  </action>
+  <action name="actionExit">
+   <property name="text">
+    <string>E&amp;xit</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+W</string>
+   </property>
+  </action>
+  <action name="actionAbout">
+   <property name="text">
+    <string>&amp;About Simulation Window</string>
+   </property>
+  </action>
+  <action name="actionAboutQt">
+   <property name="text">
+    <string>About &amp;Qt</string>
+   </property>
+  </action>
+  <action name="actionToggleResults">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="checked">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Results</string>
+   </property>
+  </action>
+  <action name="actionAddGraph">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/list-add.png</normaloff>:/icons/icons/list-add.png</iconset>
+   </property>
+   <property name="text">
+    <string>Add Graph</string>
+   </property>
+   <property name="statusTip">
+    <string>Add a graph workspace tab</string>
+   </property>
+  </action>
+  <action name="actionRemoveGraph">
+   <property name="icon">
+    <iconset resource="../resources/resources.qrc">
+     <normaloff>:/icons/icons/list-remove.png</normaloff>:/icons/icons/list-remove.png</iconset>
+   </property>
+   <property name="text">
+    <string>Remove Current Graph</string>
+   </property>
+   <property name="statusTip">
+    <string>Remove the current graph workspace tab</string>
+   </property>
+  </action>
+ </widget>
+ <resources>
+  <include location="../resources/resources.qrc"/>
+ </resources>
+ <connections/>
+</ui>

BEdit/ui/text_definition_editor.ui

@@ -12,12 +12,28 @@
     <widget class="QSplitter" name="columnSplitter">
      <property name="orientation"><enum>Qt::Orientation::Horizontal</enum></property>
      <property name="childrenCollapsible"><bool>false</bool></property>
+     <widget class="QSplitter" name="sourceSplitter">
+      <property name="orientation"><enum>Qt::Orientation::Vertical</enum></property>
+      <property name="childrenCollapsible"><bool>false</bool></property>
+      <widget class="QGroupBox" name="declarationsGroup">
+       <property name="title"><string>Declarations</string></property>
+       <layout class="QVBoxLayout" name="declarationsLayout">
+        <item><widget class="OpenModelicaEditor" name="declarationsEdit"/></item>
+       </layout>
+      </widget>
+      <widget class="QGroupBox" name="initialEquationsGroup">
+       <property name="title"><string>Initial Equations</string></property>
+       <layout class="QVBoxLayout" name="initialEquationsLayout">
+        <item><widget class="OpenModelicaEditor" name="initialEquationsEdit"/></item>
+       </layout>
+      </widget>
       <widget class="QGroupBox" name="equationsGroup">
        <property name="title"><string>Equations</string></property>
        <layout class="QVBoxLayout" name="equationsLayout">
         <item><widget class="OpenModelicaEditor" name="equationsEdit"/></item>
        </layout>
       </widget>
+     </widget>
      <widget class="QSplitter" name="definitionSplitter">
       <property name="orientation"><enum>Qt::Orientation::Vertical</enum></property>
       <property name="childrenCollapsible"><bool>false</bool></property>

BEdit/untitled.bedit.json

@@ -56,7 +56,7 @@
         "showName": false
       },
       "library": {
-        "showSubtree": false
+        "showSubtree": true
       },
       "implementation": {
         "kind": "graph",
@@ -165,7 +165,9 @@
               "implementation": {
                 "kind": "text",
                 "source": {
-                  "equations": "y = v;"
+                  "equations": "y = v;",
+                  "declarations": "",
+                  "initialEquations": ""
                 }
               }
             },
@@ -270,7 +272,9 @@
               "implementation": {
                 "kind": "text",
                 "source": {
-                  "equations": "y = k*u;"
+                  "equations": "y = k*u;",
+                  "declarations": "",
+                  "initialEquations": ""
                 }
               }
             },
@@ -377,7 +381,9 @@
               "implementation": {
                 "kind": "text",
                 "source": {
-                  "equations": "y = v+time;"
+                  "equations": "y = v+sin(10*time);",
+                  "declarations": "",
+                  "initialEquations": ""
                 }
               }
             },
@@ -482,7 +488,9 @@
               "implementation": {
                 "kind": "text",
                 "source": {
-                  "equations": "y = k*u;"
+                  "equations": "y = k*u;",
+                  "declarations": "",
+                  "initialEquations": ""
                 }
               }
             },
@@ -579,7 +587,255 @@
               "implementation": {
                 "kind": "text",
                 "source": {
-                  "equations": "y = sum(u[i] for i in 1:$u_N$ );"
+                  "equations": "y = sum(u[i] for i in 1:$u_N$ );",
+                  "declarations": "",
+                  "initialEquations": ""
+                }
+              }
+            },
+            {
+              "id": "78c8fcb6-bd46-4b85-aa91-3276a8d1e8cb",
+              "name": "Integrate0",
+              "position": {
+                "x": 224.0,
+                "y": -96.0
+              },
+              "rotation": 0.0,
+              "interface": {
+                "inputs": [
+                  {
+                    "id": "port-df34ce84",
+                    "name": "u",
+                    "position": {
+                      "x": 0.0,
+                      "y": 0.0
+                    },
+                    "properties": {
+                      "iconPosition": {
+                        "x": 64.0,
+                        "y": 64.0
+                      }
+                    },
+                    "type": "signal",
+                    "multipleConnections": false
+                  }
+                ],
+                "outputs": [
+                  {
+                    "id": "port-fe9e6486",
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+              "parameters": [
+                {
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+                  "name": "y_start",
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+              ],
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+                    "lineStyle": "solid",
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+              },
+              "library": {
+                "showSubtree": true
+              },
+              "implementation": {
+                "kind": "text",
+                "source": {
+                  "equations": "der(y) = u;",
+                  "declarations": "",
+                  "initialEquations": "y = y_start;"
+                }
+              }
+            },
+            {
+              "id": "f2caf59f-5688-46b4-b17d-bdc911580d7b",
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+                    "name": "y",
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+                  "name": "x_start",
+                  "type": "real",
+                  "value": "0"
+                },
+                {
+                  "id": "parameter-d110667b",
+                  "name": "y_start",
+                  "type": "real",
+                  "value": "0"
+                },
+                {
+                  "id": "parameter-873b503d",
+                  "name": "k",
+                  "type": "real",
+                  "value": "1"
+                },
+                {
+                  "id": "parameter-a55752c7",
+                  "name": "T",
+                  "type": "real",
+                  "value": "0.01"
+                }
+              ],
+              "icon": {
+                "shape": "rectangle",
+                "fill": "#f4f4f4",
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+                "text": "Text",
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+                  "height": 128.0
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+                    "lineStyle": "solid",
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+              "properties": {
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+              },
+              "library": {
+                "showSubtree": true
+              },
+              "implementation": {
+                "kind": "text",
+                "source": {
+                  "equations": "assert(T > 0, \"Differentiate time constant T must be positive\");\n\nder(x) = (u - x)/T;\ny = (k/T)*(u - x);",
+                  "declarations": "Real x(start=x_start);",
+                  "initialEquations": "y = y_start;"
                 }
               }
             }
@@ -644,6 +900,41 @@
               "properties": {
                 "waypoints": []
               }
+            },
+            {
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+              "source": {
+                "block": "59bb51be-8185-4b0b-a894-e38db61aff18",
+                "port": "port-a2f0dea6"
+              },
+              "target": {
+                "block": "78c8fcb6-bd46-4b85-aa91-3276a8d1e8cb",
+                "port": "port-df34ce84"
+              },
+              "name": "",
+              "properties": {
+                "waypoints": []
+              }
+            },
+            {
+              "id": "26e10b34-f168-4492-b4f2-fb46d8a4aafa",
+              "source": {
+                "block": "59bb51be-8185-4b0b-a894-e38db61aff18",
+                "port": "port-a2f0dea6"
+              },
+              "target": {
+                "block": "f2caf59f-5688-46b4-b17d-bdc911580d7b",
+                "port": "port-df34ce84"
+              },
+              "name": "",
+              "properties": {
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+                  {
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           ],
           "annotations": [],
@@ -652,8 +943,8 @@
             "enabled": false,
             "startTime": 0.0,
             "stopTime": 10.0,
-            "intervalMode": "numberOfIntervals",
-            "numberOfIntervals": 5000,
+            "intervalMode": "intervalTime",
+            "numberOfIntervals": 50000,
             "intervalTime": 0.002
           }
         }

m_Test.mo

@@ -0,0 +1,44 @@
+model m_Test
+	model m_Constant0
+		output Real y;
+		parameter Real v = 2;
+	equation
+		y = v;
+	end m_Constant0;
+	model m_gain0
+		input Real u;
+		output Real y;
+		parameter Real k = 2.5;
+	equation
+		y = k*u;
+	end m_gain0;
+	model m_const_and_time
+		output Real y;
+		parameter Real v = 4.8;
+	equation
+		y = v+sin(time);
+	end m_const_and_time;
+	model m_gain1
+		input Real u;
+		output Real y;
+		parameter Real k = -5;
+	equation
+		y = k*u;
+	end m_gain1;
+	model m_add0
+		input Real u[2];
+		output Real y;
+	equation
+		y = sum(u[i] for i in 1:2 );
+	end m_add0;
+	m_Constant0 Constant0;
+	m_gain0 gain0;
+	m_const_and_time const_and_time;
+	m_gain1 gain1;
+	m_add0 add0;
+equation
+	gain0.u = Constant0.y;
+	gain1.u = const_and_time.y;
+	add0.u[1] = gain0.y;
+	add0.u[2] = gain1.y;
+end m_Test;