Remove some calls to process_updates() which I think prevent GTK coalescing redraw requests. Remove some debugging code. Suspend update of MIDI regions during scroomer drag to speed things up (#3954).

git-svn-id: svn://localhost/ardour2/branches/3.0@9357 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/midi_streamview.cc

@@ -65,6 +65,7 @@ MidiStreamView::MidiStreamView (MidiTimeAxisView& tv)
 	, _data_note_min(60)
 	, _data_note_max(71)
         , _note_lines (0)
+	, _updates_suspended (false)
 {
 	/* use a group dedicated to MIDI underlays. Audio underlays are not in this group. */
 	midi_underlay_group = new ArdourCanvas::Group (*_canvas_group);
@@ -310,7 +311,7 @@ MidiStreamView::update_contents_height ()
 void
 MidiStreamView::draw_note_lines()
 {
-        if (!_note_lines) {
+        if (!_note_lines || _updates_suspended) {
                 return;
         }
 
@@ -371,7 +372,7 @@ MidiStreamView::apply_note_range(uint8_t lowest, uint8_t highest, bool to_region
 {
 	_highest_note = highest;
 	_lowest_note = lowest;
-	
+
 	int const range = _highest_note - _lowest_note;  
 	int const pixels_per_note = floor (child_height () / range);
 	
@@ -405,12 +406,20 @@ MidiStreamView::apply_note_range(uint8_t lowest, uint8_t highest, bool to_region
 	draw_note_lines();
 
 	if (to_region_views) {
+		apply_note_range_to_regions ();
+	}
+	
+	NoteRangeChanged();
+}
+
+void
+MidiStreamView::apply_note_range_to_regions ()
+{
+	if (!_updates_suspended) {
 		for (list<RegionView*>::iterator i = region_views.begin(); i != region_views.end(); ++i) {
 			((MidiRegionView*)(*i))->apply_note_range(_lowest_note, _highest_note);
 		}
 	}
-
-	NoteRangeChanged();
 }
 
 void
@@ -649,3 +658,24 @@ MidiStreamView::y_to_note (double y) const
 	
 	return n;
 }
+
+/** Suspend updates to the regions' note ranges and our
+ *  note lines until resume_updates() is called.
+ */
+void
+MidiStreamView::suspend_updates ()
+{
+	_updates_suspended = true;
+}
+
+/** Resume updates to region note ranges and note lines,
+ *  and update them now.
+ */
+void
+MidiStreamView::resume_updates ()
+{
+	_updates_suspended = false;
+
+	draw_note_lines ();
+	apply_note_range_to_regions ();
+}

gtk2_ardour/midi_streamview.h

@@ -97,6 +97,9 @@ class MidiStreamView : public StreamView
 
 	void apply_note_range(uint8_t lowest, uint8_t highest, bool to_region_views);
 
+	void suspend_updates ();
+	void resume_updates ();
+
   private:
 	void setup_rec_box ();
 	void update_rec_box ();
@@ -118,6 +121,7 @@ class MidiStreamView : public StreamView
 	void color_handler ();
 
 	void note_range_adjustment_changed();
+	void apply_note_range_to_regions ();
 
 	bool                      _range_dirty;
 	double                    _range_sum_cache;
@@ -126,6 +130,8 @@ class MidiStreamView : public StreamView
 	uint8_t                   _data_note_min; ///< in data
 	uint8_t                   _data_note_max; ///< in data
 	ArdourCanvas::LineSet*    _note_lines;
+	/** true if updates to the note lines and regions are currently suspended */
+	bool                      _updates_suspended;
 };
 
 #endif /* __ardour_midi_streamview_h__ */

gtk2_ardour/midi_time_axis.cc

@@ -154,6 +154,10 @@ MidiTimeAxisView::MidiTimeAxisView (PublicEditor& ed, Session* sess,
 
 		_range_scroomer = new MidiScroomer(midi_view()->note_range_adjustment);
 
+		/* Suspend updates of the StreamView during scroomer drags to speed things up */
+		_range_scroomer->DragStarting.connect (sigc::mem_fun (*midi_view(), &MidiStreamView::suspend_updates));
+		_range_scroomer->DragFinishing.connect (sigc::mem_fun (*midi_view(), &MidiStreamView::resume_updates));
+
 		controls_hbox.pack_start(*_range_scroomer);
 		controls_hbox.pack_start(*_piano_roll_header);
 

gtk2_ardour/piano_roll_header.cc

@@ -587,14 +587,7 @@ void
 PianoRollHeader::note_range_changed()
 {
 	_note_height = floor(_view.note_height()) + 0.5f;
-
 	queue_draw();
-
-	Glib::RefPtr<Gdk::Window> win = get_window();
-
-	if (win) {
-		win->process_updates(false);
-	}
 }
 
 void

libs/gtkmm2ext/gtkmm2ext/scroomer.h

@@ -57,8 +57,8 @@ public:
 	
 	inline int position_of(Component comp) { return position[comp]; }
 
-	// debug
-	std::string get_comp_name(Component);
+	sigc::signal0<void> DragStarting;
+	sigc::signal0<void> DragFinishing;
 
 protected:
 	Gtk::Adjustment& adj;

libs/gtkmm2ext/scroomer.cc

@@ -241,6 +241,8 @@ Scroomer::on_button_press_event (GdkEventButton* ev)
 		} else {
                         pinch = false;
                 }
+
+		DragStarting (); /* EMIT SIGNAL */
 	}
 	
 	return false;
@@ -281,6 +283,7 @@ Scroomer::on_button_release_event (GdkEventButton* ev)
 	grab_comp = None;
 
 	remove_modal_grab();
+	DragFinishing (); /* EMIT SIGNAL */
 	return true;
 }
 
@@ -391,29 +394,5 @@ Scroomer::adjustment_changed()
 		rect.set_height(position[BottomBase] - old_pos[Handle2]);
 		win->invalidate_rect(rect, false);
 	}
-
-	win->process_updates(false);
 }
 
-std::string
-Scroomer::get_comp_name(Component c)
-{
-	switch (c) {
-	case TopBase:
-		return "TopBase";
-	case Handle1:
-		return "Handle1";
-	case Slider:
-		return "Slider";
-	case Handle2:
-		return "Handle2";
-	case BottomBase:
-		return "BottomBase";
-	case Total:
-		return "Total";
-	case None:
-		return "None";
-	default:
-		return "ERROR";
-	}
-}