Adding feature to remove annotations

src/gui/widgets/annotation_tools_widget.py

@@ -58,6 +58,8 @@ class AnnotationToolsWidget(QWidget):
     class_selected = Signal(dict)
     class_color_changed = Signal()
     clear_annotations_requested = Signal()
+    # Request deletion of the currently selected annotation on the canvas
+    delete_selected_annotation_requested = Signal()
 
     def __init__(self, db_manager: DatabaseManager, parent=None):
         """
@@ -182,6 +184,12 @@ class AnnotationToolsWidget(QWidget):
         self.clear_btn.clicked.connect(self._on_clear_annotations)
         actions_layout.addWidget(self.clear_btn)
 
+        # Delete currently selected annotation (enabled when a selection exists)
+        self.delete_selected_btn = QPushButton("Delete Selected Annotation")
+        self.delete_selected_btn.clicked.connect(self._on_delete_selected_annotation)
+        self.delete_selected_btn.setEnabled(False)
+        actions_layout.addWidget(self.delete_selected_btn)
+
         actions_group.setLayout(actions_layout)
         layout.addWidget(actions_group)
 
@@ -439,6 +447,20 @@ class AnnotationToolsWidget(QWidget):
             self.clear_annotations_requested.emit()
             logger.debug("Clear annotations requested")
 
+    def _on_delete_selected_annotation(self):
+        """Handle delete selected annotation button."""
+        self.delete_selected_annotation_requested.emit()
+        logger.debug("Delete selected annotation requested")
+
+    def set_has_selected_annotation(self, has_selection: bool):
+        """
+        Enable/disable actions that require a selected annotation.
+
+        Args:
+            has_selection: True if an annotation is currently selected on the canvas.
+        """
+        self.delete_selected_btn.setEnabled(bool(has_selection))
+
     def get_current_class(self) -> Optional[Dict]:
         """Get currently selected object class."""
         return self.current_class