Fix drag-drop for buttonGroups

Previously a boolean model would be dragged when Ctrl-Dragging on a
button belonging to a button group.  This fix causes the integer-model
of the group to be dragged instead.

The original behavior would allow the user to toggle multiple values
simultaneously by using several automation tracks.  Plus, I would think
this new behavior is more convenient.

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1968 0778d3d1-df1d-0410-868b-ea421aaaa00d

Conflicts:
	ChangeLog.old
	src/gui/widgets/automatable_button.cpp

ChangeLog.old

@@ -158,6 +158,11 @@
 	* plugins/flp_import/unrtf/convert.c:
 	Avoid compile warnings
 
+2009-01-03	Paul Giblock <drfaygo/at/gmail/dot/com>
+
+	* src/gui/widgets/automatable_button.cpp:
+	fix drag support for button groups
+
 2008-12-22	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
 
 	* CMakeLists.txt:

src/gui/widgets/automatable_button.cpp

@@ -32,7 +32,7 @@
 #include "engine.h"
 #include "embed.h"
 #include "MainWindow.h"
-
+#include "string_pair_drag.h"
 
 
 
@@ -115,6 +115,7 @@ void automatableButton::mousePressEvent( QMouseEvent * _me )
 	if( _me->button() == Qt::LeftButton &&
 			! ( _me->modifiers() & Qt::ControlModifier ) )
 	{
+        // User simply clicked, toggle if needed
 		if( isCheckable() )
 		{
 			toggle();
@@ -123,8 +124,23 @@ void automatableButton::mousePressEvent( QMouseEvent * _me )
 	}
 	else
 	{
-		AutomatableModelView::mousePressEvent( _me );
-		QPushButton::mousePressEvent( _me );
+		// Ctrl-clicked, need to prepare drag-drop
+		if( m_group )
+		{
+			// A group, we must get process it instead
+			AutomatableModelView* groupView = (AutomatableModelView*)m_group;
+			new stringPairDrag( "automatable_model",
+					QString::number( groupView->modelUntyped()->id() ),
+					QPixmap(), widget() );
+			// TODO: ^^ Maybe use a predefined icon instead of the button they happened to select
+			_me->accept();
+		}
+		else
+		{
+			// Otherwise, drag the standalone button
+			AutomatableModelView::mousePressEvent( _me );
+			QPushButton::mousePressEvent( _me );
+		}
 	}
 }