make it possible for canvas patch changes to receive kbd events, and along the way clean up a couple of related issues, providing noevent-pixbuf (which we should probably use for regionview names too)

git-svn-id: svn://localhost/ardour2/branches/3.0@12745 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/canvas-flag.cc

@@ -5,6 +5,7 @@
 
 #include "ardour_ui.h"
 #include "canvas-flag.h"
+#include "canvas-noevent-pixbuf.h"
 #include "time_axis_view_item.h"
 #include "utils.h"
 
@@ -28,7 +29,6 @@ CanvasFlag::CanvasFlag (MidiRegionView& region,
 	, _line(0)
 	, _rect(0)
 {
-	signal_event().connect (sigc::mem_fun (*this, &CanvasFlag::on_event));
 }
 
 void
@@ -49,7 +49,7 @@ CanvasFlag::set_text (const string& text)
 {
 	delete_allocated_objects();
 
-	_name_pixbuf = new ArdourCanvas::Pixbuf (*this);
+	_name_pixbuf = new ArdourCanvas::NoEventPixbuf (*this);
 	name_pixbuf_width = Gtkmm2ext::pixel_width (text, TimeAxisViewItem::NAME_FONT) + 2;
 	Gdk::Color c;
 	set_color (c, _outline_color_rgba);
@@ -75,15 +75,6 @@ CanvasFlag::~CanvasFlag()
 	delete_allocated_objects();
 }
 
-bool
-CanvasFlag::on_event(GdkEvent* /*ev*/)
-{
-	/* XXX if you change this function to actually do anything, be sure
-	   to fix the connections commented out elsewhere in this file.
-	*/
-	return false;
-}
-
 void
 CanvasFlag::set_height (double h)
 {

gtk2_ardour/canvas-flag.h

@@ -28,8 +28,6 @@ public:
 
 	virtual ~CanvasFlag();
 
-	virtual bool on_event(GdkEvent* ev);
-
 	virtual void set_text(const std::string& a_text);
 	virtual void set_height (double);
 

gtk2_ardour/canvas-noevent-pixbuf.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2009 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ */
+
+#ifndef __gtk2_ardour_canvas_noevent_pixbuf_h__
+#define __gtk2_ardour_canvas_noevent_pixbuf_h__
+
+#include <libgnomecanvasmm/pixbuf.h>
+
+namespace Gnome { namespace Canvas {
+
+class NoEventPixbuf : public Pixbuf
+{
+  public:
+    NoEventPixbuf(Group& parent) : Pixbuf (parent) {}
+
+    double point_vfunc(double, double, int, int, GnomeCanvasItem**) {
+	    /* return a huge value to tell the canvas that we're never the item for an event */
+	    return 9999999999999.0;
+    }
+};
+
+} } /* namespaces */
+
+#endif /* __gtk2_ardour_canvas_noevent_pixbuf_h__ */

gtk2_ardour/canvas_patch_change.cc

@@ -21,6 +21,8 @@
 
 #include <boost/algorithm/string.hpp>
 
+#include "pbd/stacktrace.h"
+
 #include "gtkmm2ext/keyboard.h"
 #include "ardour/instrument_info.h"
 
@@ -144,11 +146,12 @@ CanvasPatchChange::on_patch_menu_selected(const PatchPrimaryKey& key)
 bool
 CanvasPatchChange::on_event (GdkEvent* ev)
 {
+	Editor* e;
+
 	switch (ev->type) {
 	case GDK_BUTTON_PRESS:
-	{
 		/* XXX: icky dcast */
-		Editor* e = dynamic_cast<Editor*> (&_region.get_time_axis_view().editor());
+		e = dynamic_cast<Editor*> (&_region.get_time_axis_view().editor());
 		if (e->current_mouse_mode() == Editing::MouseObject && e->internal_editing()) {
 
 			if (Gtkmm2ext::Keyboard::is_delete_event (&ev->button)) {
@@ -178,7 +181,6 @@ CanvasPatchChange::on_event (GdkEvent* ev)
 			return true;
 		}
 		break;
-	}
 
 	case GDK_KEY_PRESS:
 		switch (ev->key.keyval) {
@@ -200,15 +202,18 @@ CanvasPatchChange::on_event (GdkEvent* ev)
 				_region.next_patch (*this);
 			}
 			break;
+		case GDK_Delete:
+		case GDK_BackSpace:
+			_region.delete_patch_change (this);
+			break;
 		default:
 			break;
 		}
 		break;
 
 	case GDK_SCROLL:
-	{
 		/* XXX: icky dcast */
-		Editor* e = dynamic_cast<Editor*> (&_region.get_time_axis_view().editor());
+		e = dynamic_cast<Editor*> (&_region.get_time_axis_view().editor());
 		if (e->current_mouse_mode() == Editing::MouseObject && e->internal_editing()) {
 			if (ev->scroll.direction == GDK_SCROLL_UP) {
 				if (Keyboard::modifier_state_contains (ev->scroll.state, Keyboard::PrimaryModifier)) {
@@ -216,25 +221,26 @@ CanvasPatchChange::on_event (GdkEvent* ev)
 				} else {
 					_region.previous_patch (*this);
 				}
-				return true;
 			} else if (ev->scroll.direction == GDK_SCROLL_DOWN) {
 				if (Keyboard::modifier_state_contains (ev->scroll.state, Keyboard::PrimaryModifier)) {
 					_region.next_bank (*this);
 				} else {
 					_region.next_patch (*this);
 				}
-				return true;
 			}
+			return true;
 			break;
 		}
-        }
+		break;
 
 	case GDK_ENTER_NOTIFY:
 		_region.patch_entered (this);
+                return true;
 		break;
 
 	case GDK_LEAVE_NOTIFY:
 		_region.patch_left (this);
+                return true;
 		break;
 
 	default:

gtk2_ardour/midi_region_view.cc

@@ -277,8 +277,7 @@ MidiRegionView::init (Gdk::Color const & basic_color, bool wfd)
 	reset_width_dependent_items (_pixel_width);
 
 	group->raise_to_top();
-	group->signal_event().connect(
+	group->signal_event().connect (sigc::mem_fun (this, &MidiRegionView::canvas_event), false);
-		sigc::mem_fun(this, &MidiRegionView::canvas_event), false);
 
 	midi_view()->signal_channel_mode_changed().connect(
 		sigc::mem_fun(this, &MidiRegionView::midi_channel_mode_changed));
@@ -714,7 +713,11 @@ MidiRegionView::key_press (GdkEventKey* ev)
 
 		return true;
 
-	} else if (ev->keyval == GDK_Delete && unmodified) {
+	} else if ((ev->keyval == GDK_BackSpace || ev->keyval == GDK_Delete) && unmodified) {
+
+		if (_selection.empty()) {
+			return false;
+		}
 
 		delete_selection();
 		return true;
@@ -1798,7 +1801,7 @@ MidiRegionView::add_canvas_patch_change (MidiModel::PatchChangePtr patch, const
 	double const height = midi_stream_view()->contents_height();
 
 	boost::shared_ptr<CanvasPatchChange> patch_change = boost::shared_ptr<CanvasPatchChange>(
-		new CanvasPatchChange(*this, *_note_group,
+		new CanvasPatchChange(*this, *group,
 		                      displaytext,
 		                      height,
 		                      x, 1.0,
@@ -3139,18 +3142,24 @@ MidiRegionView::note_left (ArdourCanvas::CanvasNoteEvent*)
 }
 
 void
-MidiRegionView::patch_entered (ArdourCanvas::CanvasPatchChange* ev)
+MidiRegionView::patch_entered (ArdourCanvas::CanvasPatchChange* p)
 {
 	ostringstream s;
 	/* XXX should get patch name if we can */
-	s << _("Bank:") << (ev->patch()->bank() + MIDI_BP_ZERO) << '\n' << _("Program:") << ((int) ev->patch()->program()) + MIDI_BP_ZERO << '\n' << _("Channel:") << ((int) ev->patch()->channel() + 1);
+	s << _("Bank:") << (p->patch()->bank() + MIDI_BP_ZERO) << '\n' 
+	  << _("Program:") << ((int) p->patch()->program()) + MIDI_BP_ZERO << '\n' 
+	  << _("Channel:") << ((int) p->patch()->channel() + 1);
 	show_verbose_cursor (s.str(), 10, 20);
+	p->grab_focus();
 }
 
 void
 MidiRegionView::patch_left (ArdourCanvas::CanvasPatchChange *)
 {
 	trackview.editor().verbose_cursor()->hide ();
+	/* focus will transfer back via the enter-notify event sent to this
+	 * midi region view.
+	 */
 }
 
 void