Document handling

New/Open/Save/Save as and Undo/Redo

src/bedit_gui/views/dialogs/document_dialogs.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+from enum import Enum, auto
+from pathlib import Path
+
+from PySide6.QtWidgets import QFileDialog, QMessageBox, QWidget
+
+
+class SaveChangesChoice(Enum):
+    SAVE = auto()
+    DISCARD = auto()
+    CANCEL = auto()
+
+
+class DocumentDialogs:
+    """All modal dialogs used by the document workflow."""
+
+    FILE_FILTER = "BEdit documents (*.beb *.json);;BEdit binary (*.beb);;JSON (*.json)"
+
+    def __init__(self, parent: QWidget) -> None:
+        self._parent = parent
+
+    def choose_open_path(self, current_path: Path | None) -> Path | None:
+        directory = str(current_path.parent) if current_path else ""
+        file_name, _ = QFileDialog.getOpenFileName(
+            self._parent,
+            "Open BEdit Document",
+            directory,
+            self.FILE_FILTER,
+        )
+        return Path(file_name) if file_name else None
+
+    def choose_save_path(self, current_path: Path | None) -> Path | None:
+        suggested = str(current_path) if current_path else "Untitled.beb"
+        file_name, selected_filter = QFileDialog.getSaveFileName(
+            self._parent,
+            "Save BEdit Document",
+            suggested,
+            self.FILE_FILTER,
+        )
+        if not file_name:
+            return None
+
+        path = Path(file_name)
+        if not path.suffix:
+            suffix = ".json" if "JSON" in selected_filter else ".beb"
+            path = path.with_suffix(suffix)
+        return path
+
+    def ask_save_changes(self) -> SaveChangesChoice:
+        answer = QMessageBox.warning(
+            self._parent,
+            "Unsaved Changes",
+            "The current document has unsaved changes.",
+            QMessageBox.StandardButton.Save
+            | QMessageBox.StandardButton.Discard
+            | QMessageBox.StandardButton.Cancel,
+            QMessageBox.StandardButton.Save,
+        )
+        if answer == QMessageBox.StandardButton.Save:
+            return SaveChangesChoice.SAVE
+        if answer == QMessageBox.StandardButton.Discard:
+            return SaveChangesChoice.DISCARD
+        return SaveChangesChoice.CANCEL
+
+    def show_file_error(self, title: str, error: Exception) -> None:
+        QMessageBox.critical(self._parent, title, str(error))