diff --git a/scanslicer/controller_canvas_actions.py b/scanslicer/controller_canvas_actions.py
index b3790e3..219d737 100644
--- a/scanslicer/controller_canvas_actions.py
+++ b/scanslicer/controller_canvas_actions.py
@@ -2,3 +2,116 @@ from .slices import PhotoSlice
 
 
 # ScanSlicerCanvasActionsMixin: class definition for ScanSlicer behavior.
+class ScanSlicerCanvasActionsMixin:
+    # on_active_slice_changed: function definition for ScanSlicer behavior.
+    def on_active_slice_changed(self, index):
+        self.refresh_active_box_toolbar(index)
+
+    # refresh_active_box_toolbar: function definition for ScanSlicer behavior.
+    def refresh_active_box_toolbar(self, index=None):
+        if index == -1:
+            index = None
+        if index is None:
+            index = self.slicing_canvas.active_slice_index
+
+        has_slices = len(self.slicing_canvas.slices) > 0
+        self.all_boxes_lock_button.setEnabled(has_slices)
+        self.all_boxes_lock_button.blockSignals(True)
+        self.all_boxes_lock_button.setChecked(self.slicing_canvas.are_all_slices_locked())
+        self.all_boxes_lock_button.blockSignals(False)
+
+        active_slice = self.slicing_canvas.get_active_slice()
+        if active_slice is None:
+            self.active_box_label.setText("Active Box: none")
+            self.active_box_lock_button.setEnabled(False)
+            self.active_box_squarize_button.setEnabled(False)
+            self.active_box_reset_rotation_button.setEnabled(False)
+            self.active_box_remove_button.setEnabled(False)
+            self.active_box_lock_button.blockSignals(True)
+            self.active_box_lock_button.setChecked(False)
+            self.active_box_lock_button.blockSignals(False)
+            return
+
+        if index is None:
+            index = self.slicing_canvas.active_slice_index
+        self.active_box_label.setText(f"Active Box: {index}")
+        self.active_box_lock_button.setEnabled(True)
+        self.active_box_squarize_button.setEnabled(True)
+        self.active_box_reset_rotation_button.setEnabled(True)
+        self.active_box_remove_button.setEnabled(True)
+        self.active_box_lock_button.blockSignals(True)
+        self.active_box_lock_button.setChecked(active_slice.locked)
+        self.active_box_lock_button.blockSignals(False)
+
+    # toggle_active_box_lock: function definition for ScanSlicer behavior.
+    def toggle_active_box_lock(self, checked):
+        if not self.slicing_canvas.set_active_slice_locked(checked):
+            self.refresh_active_box_toolbar()
+            return
+        self.refresh_active_box_toolbar()
+
+    # toggle_all_boxes_lock: function definition for ScanSlicer behavior.
+    def toggle_all_boxes_lock(self, checked):
+        count = self.slicing_canvas.set_all_slices_locked(checked)
+        self.refresh_active_box_toolbar()
+        if count == 0:
+            self.update_statusbar("No boxes available.")
+            return
+        if checked:
+            self.update_statusbar(f"Locked {count} box(es).")
+        else:
+            self.update_statusbar(f"Unlocked {count} box(es).")
+
+    # squarize_active_box: function definition for ScanSlicer behavior.
+    def squarize_active_box(self):
+        if not self.slicing_canvas.squarize_active_slice():
+            self.update_statusbar("No active box selected.")
+            return
+        self.update_statusbar("Active box squarized.")
+
+    # reset_active_box_rotation: function definition for ScanSlicer behavior.
+    def reset_active_box_rotation(self):
+        if not self.slicing_canvas.reset_active_slice_rotation():
+            self.update_statusbar("No active box selected.")
+            return
+        self.update_statusbar("Active box rotation reset.")
+
+    # remove_active_box: function definition for ScanSlicer behavior.
+    def remove_active_box(self):
+        if not self.slicing_canvas.remove_active_slice():
+            self.update_statusbar("No active box selected.")
+            return
+        self.refresh_active_box_toolbar()
+        self.update_statusbar("Active box removed.")
+
+    # set_preview_filter_enabled: function definition for ScanSlicer behavior.
+    def set_preview_filter_enabled(self, checked):
+        self.preview_filter_enabled = bool(checked)
+        if self.preview_filter_enabled:
+            self.update_statusbar("Filter preview enabled.")
+        else:
+            self.update_statusbar("Filter preview disabled.")
+
+        if self.autoslicer.image_loaded():
+            self.update_preview(new_image=False, run_detection=False)
+
+    # set_rotate_handles_mode: function definition for ScanSlicer behavior.
+    def set_rotate_handles_mode(self, checked):
+        self.slicing_canvas.set_rotate_handles_mode(checked)
+        if checked:
+            self.update_statusbar("Rotate mode enabled.")
+        else:
+            self.update_statusbar("Rotate mode disabled.")
+
+    # reset_canvas_view: function definition for ScanSlicer behavior.
+    def reset_canvas_view(self):
+        if not self.slicing_canvas.reset_view():
+            self.update_statusbar("No image loaded.")
+            return
+        self.update_statusbar("View reset.")
+
+    # add_box: function definition for ScanSlicer behavior.
+    def add_box(self):
+        new_slice = PhotoSlice(None)
+        new_slice.toggle_locked()
+        self.slicing_canvas.add_bbox(new_slice)