(backport) minimal changes to make group bar more discoverable

* highlight on mouseover
* set cursor to indicate drag motion

gtk2_ardour/audio_region_view.cc

@@ -1706,9 +1706,7 @@ AudioRegionView::set_some_waveform_colors (vector<ArdourWaveView::WaveView*>& wa
 
 	/* use track/region color to fill wform */
 	fill = fill_color;
-#ifndef LIVETRAX
 	fill = UINT_INTERPOLATE (fill, UIConfiguration::instance().color ("waveform fill"), 0.5);
-#endif
 
 	/* set outline */
 	outline = UIConfiguration::instance().color ("waveform outline");

gtk2_ardour/group_tabs.cc

@@ -52,8 +52,9 @@ GroupTabs::GroupTabs ()
 	: _menu (0)
 	, _dragging (0)
 	, _dragging_new_tab (0)
+	, _hovering (false)
 {
-	add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK);
+	add_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK|Gdk::ENTER_NOTIFY_MASK|Gdk::LEAVE_NOTIFY_MASK);
 	UIConfiguration::instance().ColorsChanged.connect (sigc::mem_fun (*this, &GroupTabs::queue_draw));
 }
 
@@ -82,6 +83,33 @@ GroupTabs::set_session (Session* s)
 	}
 }
 
+bool
+GroupTabs::on_enter_notify_event (GdkEventCrossing* ev)
+{
+	_hovering = true;
+
+	if (UIConfiguration::instance ().get_widget_prelight ()) {
+		queue_draw ();
+	}
+
+	get_window()->set_cursor (Gdk::Cursor( primary_coordinate(1,0) ? Gdk::SB_H_DOUBLE_ARROW : Gdk::SB_V_DOUBLE_ARROW));
+
+	return CairoWidget::on_enter_notify_event (ev);
+}
+
+bool
+GroupTabs::on_leave_notify_event (GdkEventCrossing* ev)
+{
+	_hovering = false;
+
+	if (UIConfiguration::instance ().get_widget_prelight ()) {
+		queue_draw ();
+	}
+
+	get_window()->set_cursor ();
+
+	return CairoWidget::on_leave_notify_event (ev);
+}
 
 /** Handle a size request.
  *  @param req GTK requisition
@@ -283,6 +311,13 @@ GroupTabs::render (Cairo::RefPtr<Cairo::Context> const& ctx, cairo_rectangle_t*)
 	for (list<Tab>::const_iterator i = _tabs.begin(); i != _tabs.end(); ++i) {
 		draw_tab (cr, *i);
 	}
+
+	if (_hovering) {
+		cairo_set_source_rgba (cr, 1, 1, 1, 0.15);
+		cairo_rectangle (cr, 0, 0, get_width(), get_height());
+		cairo_fill (cr);
+	}
+
 }
 
 /** Convert a click position to a tab.

gtk2_ardour/group_tabs.h

@@ -133,6 +133,9 @@ private:
 	bool on_motion_notify_event (GdkEventMotion *);
 	bool on_button_release_event (GdkEventButton *);
 
+	bool on_enter_notify_event (GdkEventCrossing*);
+	bool on_leave_notify_event (GdkEventCrossing*);
+
 	Tab * click_to_tab (double, std::list<Tab>::iterator *, std::list<Tab>::iterator *);
 
 	void route_group_property_changed (ARDOUR::RouteGroup *);
@@ -163,6 +166,8 @@ private:
 	double _drag_max; ///< maximum position for drag
 	double _drag_first; ///< first mouse pointer position during drag
 
+	bool  _hovering;
+
 	/** colors that have been used for new route group tabs */
 	static std::list<Gdk::Color> _used_colors;
 };

gtk2_ardour/themes/dark-livetrax.colors

@@ -177,8 +177,8 @@
     <ColorAlias name="image track" alias="neutral:foreground2"/>
     <ColorAlias name="inactive crossfade" alias="theme:contrast"/>
     <ColorAlias name="inactive fade handle" alias="neutral:foreground2"/>
-    <ColorAlias name="group tab base" alias="neutral:background2"/>
-    <ColorAlias name="inactive group tab" alias="widget:bg"/>
+    <ColorAlias name="group tab base" alias="theme:bg"/>
+    <ColorAlias name="inactive group tab" alias="neutral:midground"/>
     <ColorAlias name="invert button: fill" alias="widget:bg"/>
     <ColorAlias name="invert button: fill active" alias="alert:blue"/>
     <ColorAlias name="invert button: led active" alias="alert:green"/>