From 25655e1a6dae74a10707ebc8faa7b2bd0ab16210 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 9 May 2012 23:04:18 +0000
Subject: [PATCH] skeleton for crossfade edge dragging

git-svn-id: svn://localhost/ardour2/branches/3.0@12235 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 gtk2_ardour/editor_canvas_events.cc |  8 ++-----
 gtk2_ardour/editor_drag.cc          | 37 +++++++++++++++++++++++++++++
 gtk2_ardour/editor_drag.h           | 22 +++++++++++++++++
 gtk2_ardour/editor_mouse.cc         |  8 +++++++
 4 files changed, 69 insertions(+), 6 deletions(-)

diff --git a/gtk2_ardour/editor_canvas_events.cc b/gtk2_ardour/editor_canvas_events.cc
index a123ea1e9c..77bc5ec27b 100644
--- a/gtk2_ardour/editor_canvas_events.cc
+++ b/gtk2_ardour/editor_canvas_events.cc
@@ -377,9 +377,7 @@ Editor::canvas_start_xfade_event (GdkEvent *event, ArdourCanvas::Item* item, Aud
 
 	}
 
-	/* proxy for the regionview */
-
-	return canvas_region_view_event (event, rv->get_canvas_group(), rv);
+	return typed_event (item, event, StartCrossFadeItem);
 }
 
 bool
@@ -411,9 +409,7 @@ Editor::canvas_end_xfade_event (GdkEvent *event, ArdourCanvas::Item* item, Audio
 
 	}
 
-	/* proxy for the regionview */
-
-	return canvas_region_view_event (event, rv->get_canvas_group(), rv);
+	return typed_event (item, event, EndCrossFadeItem);
 }
 
 bool
diff --git a/gtk2_ardour/editor_drag.cc b/gtk2_ardour/editor_drag.cc
index 66bb09980f..2489114982 100644
--- a/gtk2_ardour/editor_drag.cc
+++ b/gtk2_ardour/editor_drag.cc
@@ -4551,3 +4551,40 @@ NoteCreateDrag::aborted (bool)
 {
 	
 }
+
+/*------------*/
+
+CrossfadeEdgeDrag::CrossfadeEdgeDrag (Editor* e, AudioRegionView* rv, ArdourCanvas::Item* i, bool start_yn)
+	: Drag (e, i)
+	, arv (rv)
+	, start (start_yn)
+{
+	cerr << "new xfade drag\n";
+}
+
+CrossfadeEdgeDrag::~CrossfadeEdgeDrag ()
+{
+	cerr << "destory xfade drag\n";
+}
+
+void
+CrossfadeEdgeDrag::start_grab (GdkEvent* event, Gdk::Cursor *cursor)
+{
+	Drag::start_grab (event, cursor);
+}
+
+void
+CrossfadeEdgeDrag::motion (GdkEvent*, bool)
+{
+}
+
+void
+CrossfadeEdgeDrag::finished (GdkEvent*, bool)
+{
+}
+
+void
+CrossfadeEdgeDrag::aborted (bool)
+{
+}
+
diff --git a/gtk2_ardour/editor_drag.h b/gtk2_ardour/editor_drag.h
index 0d457a39d9..3c33e4de48 100644
--- a/gtk2_ardour/editor_drag.h
+++ b/gtk2_ardour/editor_drag.h
@@ -972,5 +972,27 @@ private:
 	bool _nothing_to_drag;
 };
 
+/** Drag of one edge of an xfade
+ */
+class CrossfadeEdgeDrag : public Drag
+{
+  public:
+	CrossfadeEdgeDrag (Editor*, AudioRegionView*, ArdourCanvas::Item*, bool start);
+	~CrossfadeEdgeDrag ();
+
+	void start_grab (GdkEvent*, Gdk::Cursor* c = 0);
+	void motion (GdkEvent*, bool);
+	void finished (GdkEvent*, bool);
+	void aborted (bool);
+	
+	bool x_movement_matters () const {
+		return false;
+	}
+
+  private:
+	AudioRegionView* arv;
+	bool start;
+};
+
 #endif /* __gtk2_ardour_editor_drag_h_ */
 
diff --git a/gtk2_ardour/editor_mouse.cc b/gtk2_ardour/editor_mouse.cc
index 351ed82e64..a36e4a5df6 100644
--- a/gtk2_ardour/editor_mouse.cc
+++ b/gtk2_ardour/editor_mouse.cc
@@ -935,6 +935,14 @@ Editor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 				return true;
 			}
 
+			case StartCrossFadeItem:
+				_drags->set (new CrossfadeEdgeDrag (this, reinterpret_cast<AudioRegionView*>(item->get_data("regionview")), item, true), event, 0);
+				break;
+
+			case EndCrossFadeItem:
+				_drags->set (new CrossfadeEdgeDrag (this, reinterpret_cast<AudioRegionView*>(item->get_data("regionview")), item, true), event, 0);
+				break;
+
 			case FeatureLineItem:
 			{
 				if (Keyboard::modifier_state_contains (event->button.state, Keyboard::TertiaryModifier)) {