forward scroll events from track control headers to the canvas, to get consistent scroll behaviour (whatever that behaviour is)

gtk2_ardour/editor.cc

@@ -495,11 +495,9 @@ Editor::Editor ()
 	controls_layout.add (*h);
 
 	controls_layout.set_name ("EditControlsBase");
-	controls_layout.add_events (Gdk::SCROLL_MASK);
+	controls_layout.add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK|Gdk::SCROLL_MASK);
-	controls_layout.signal_scroll_event().connect (sigc::mem_fun(*this, &Editor::control_layout_scroll), false);
-
-	controls_layout.add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);
 	controls_layout.signal_button_release_event().connect (sigc::mem_fun(*this, &Editor::edit_controls_button_release));
+	controls_layout.signal_scroll_event().connect (sigc::mem_fun(*this, &Editor::control_layout_scroll), false);
 
 	_cursors = new MouseCursors;
 
@@ -3878,26 +3876,14 @@ Editor::transport_punch_location()
 bool
 Editor::control_layout_scroll (GdkEventScroll* ev)
 {
-	if (Keyboard::some_magic_widget_has_focus()) {
+	/* Just forward to the normal canvas scroll method. The coordinate
-		return false;
+	   systems are different but since the canvas is always larger than the
-	}
+	   track headers, and aligned with the trackview area, this will work.
 
-	switch (ev->direction) {
+	   In the not too distant future this layout is going away anyway and
-	case GDK_SCROLL_UP:
+	   headers will be on the canvas.
-		scroll_tracks_up_line ();
+	*/
-		return true;
+	return canvas_scroll_event (ev);
-		break;
-
-	case GDK_SCROLL_DOWN:
-		scroll_tracks_down_line ();
-		return true;
-
-	default:
-		/* no left/right handling yet */
-		break;
-	}
-
-	return false;
 }
 
 void

gtk2_ardour/editor.h

@@ -1402,6 +1402,7 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 
 	/* Canvas event handlers */
 
+	bool canvas_scroll_event (GdkEventScroll* event);
 	bool canvas_control_point_event (GdkEvent* event,ArdourCanvas::Item*, ControlPoint*);
 	bool canvas_line_event (GdkEvent* event,ArdourCanvas::Item*, AutomationLine*);
 	bool canvas_selection_rect_event (GdkEvent* event,ArdourCanvas::Item*, SelectionRect*);
@@ -1458,7 +1459,6 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 	bool canvas_playhead_cursor_event (GdkEvent* event, ArdourCanvas::Item*);
 	bool track_canvas_scroll (GdkEventScroll* event);
 
-	bool track_canvas_scroll_event (GdkEventScroll* event);
 	bool track_canvas_button_press_event (GdkEventButton* event);
 	bool track_canvas_button_release_event (GdkEventButton* event);
 	bool track_canvas_motion_notify_event (GdkEventMotion* event);

gtk2_ardour/editor_canvas.cc

@@ -236,7 +236,7 @@ Editor::initialize_canvas ()
 	   handlers.
 	*/
 
-	_track_canvas->signal_scroll_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_scroll_event));
+	_track_canvas->signal_scroll_event().connect (sigc::mem_fun (*this, &Editor::canvas_scroll_event));
 	_track_canvas->signal_motion_notify_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_motion_notify_event));
 	_track_canvas->signal_button_press_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_button_press_event));
 	_track_canvas->signal_button_release_event().connect (sigc::mem_fun (*this, &Editor::track_canvas_button_release_event));

gtk2_ardour/editor_canvas_events.cc

@@ -60,6 +60,10 @@ using Gtkmm2ext::Keyboard;
 bool
 Editor::track_canvas_scroll (GdkEventScroll* ev)
 {
+	if (Keyboard::some_magic_widget_has_focus()) {
+		return false;
+	}
+	
 	framepos_t xdelta;
 	int direction = ev->direction;
 
@@ -156,7 +160,7 @@ Editor::track_canvas_scroll (GdkEventScroll* ev)
 }
 
 bool
-Editor::track_canvas_scroll_event (GdkEventScroll *event)
+Editor::canvas_scroll_event (GdkEventScroll *event)
 {
 	_track_canvas->grab_focus();
 	return track_canvas_scroll (event);
@@ -1010,7 +1014,7 @@ Editor::canvas_note_event (GdkEvent *event, ArdourCanvas::Item* item)
 }
 
 bool
-Editor::canvas_drop_zone_event (GdkEvent* event)
+Editor::canvas_drop_zone_event (GdkEvent* /*event*/)
 {
 	return true;
 }

gtk2_ardour/public_editor.h

@@ -318,6 +318,7 @@ class PublicEditor : public Gtk::Window, public PBD::StatefulDestructible, publi
 
 	virtual void reset_focus () = 0;
 
+	virtual bool canvas_scroll_event (GdkEventScroll* event) = 0;
 	virtual bool canvas_control_point_event (GdkEvent* event, ArdourCanvas::Item*, ControlPoint*) = 0;
 	virtual bool canvas_line_event (GdkEvent* event, ArdourCanvas::Item*, AutomationLine*) = 0;
 	virtual bool canvas_selection_rect_event (GdkEvent* event, ArdourCanvas::Item*, SelectionRect*) = 0;

gtk2_ardour/time_axis_view.cc

@@ -287,43 +287,14 @@ TimeAxisView::show_at (double y, int& nth, VBox *parent)
 bool
 TimeAxisView::controls_ebox_scroll (GdkEventScroll* ev)
 {
-	switch (ev->direction) {
+	/* Just forward to the normal canvas scroll method. The coordinate
-	case GDK_SCROLL_UP:
+	   systems are different but since the canvas is always larger than the
-		if (Keyboard::modifier_state_equals (ev->state, Keyboard::ScrollZoomVerticalModifier)) {
+	   track headers, and aligned with the trackview area, this will work.
-			/* See Editor::_stepping_axis_view for notes on this hack */
-			Editor& e = dynamic_cast<Editor&> (_editor);
-			if (!e.stepping_axis_view ()) {
-				e.set_stepping_axis_view (this);
-			}
-			e.stepping_axis_view()->step_height (false);
-			return true;
-		} else if (Keyboard::no_modifiers_active (ev->state)) {
-			_editor.scroll_up_one_track();
-			return true;
-		}
-		break;
 
-	case GDK_SCROLL_DOWN:
+	   In the not too distant future this layout is going away anyway and
-		if (Keyboard::modifier_state_equals (ev->state, Keyboard::ScrollZoomVerticalModifier)) {
+	   headers will be on the canvas.
-			/* See Editor::_stepping_axis_view for notes on this hack */
+	*/
-			Editor& e = dynamic_cast<Editor&> (_editor);
+	return _editor.canvas_scroll_event (ev);
-			if (!e.stepping_axis_view ()) {
-				e.set_stepping_axis_view (this);
-			}
-			e.stepping_axis_view()->step_height (true);
-			return true;
-		} else if (Keyboard::no_modifiers_active (ev->state)) {
-			_editor.scroll_down_one_track();
-			return true;
-		}
-		break;
-
-	default:
-		/* no handling for left/right, yet */
-		break;
-	}
-
-	return false;
 }
 
 bool