Document tree panel

src/bedit_gui/controllers/document_tree_controller.py

@@ -0,0 +1,34 @@
+from PySide6.QtCore import QObject
+
+from bedit_core.models import Document as CoreDocument
+from bedit_gui.documents import Document
+from bedit_gui.views.main_window import MainWindow
+from bedit_gui.views.models.document_tree_model import DocumentTreeModel
+
+
+class DocumentTreeController(QObject):
+    def __init__(
+        self,
+        document: Document,
+        window: MainWindow,
+    ) -> None:
+        super().__init__(window)
+
+        self.document = document
+        self.window = window
+        self.model = DocumentTreeModel()
+
+        window.ui.documentTree.setModel(self.model)
+        document.model_changed.connect(self._on_document_changed)
+
+        window.ui.documentTree.setHeaderHidden(True)
+
+        self._on_document_changed(document.model)
+
+    def _on_document_changed(self, model: CoreDocument) -> None:
+        """Rebuild the tree whenever New/Open replaces the core document."""
+        self.model.set_document(model)
+
+        # Optional presentation behavior. Later, you could instead remember
+        # expanded component IDs and restore only those nodes.
+        self.window.ui.documentTree.expandAll()