more object lifetime management fixes, plus a couple of tiny cleanups

git-svn-id: svn://localhost/ardour2/trunk@992 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/ardour.menus

@@ -291,8 +291,6 @@
                <menuitem action='SendMTC'/>
                <menuitem action='SendMMC'/>
                <menuitem action='UseMMC'/>
-               <menuitem action='SendMIDIfeedback'/>
-               <menuitem action='UseMIDIcontrol'/>
                <separator/>
                <menuitem action='StopPluginsWithTransport'/>
                <menuitem action='DoNotRunPluginsWhileRecording'/>

gtk2_ardour/editor_ops.cc

@@ -951,8 +951,8 @@ Editor::scroll_forward (float pages)
 		}
 	}
 
-	if (ULONG_MAX - cnt < leftmost_frame) {
-		frame = ULONG_MAX - cnt;
+	if (max_frames - cnt < leftmost_frame) {
+		frame = max_frames - cnt;
 	} else {
 		frame = leftmost_frame + cnt;
 	}

gtk2_ardour/route_ui.cc

@@ -26,6 +26,8 @@
 
 #include <ardour/route_group.h>
 #include <pbd/memento_command.h>
+#include <pbd/stacktrace.h>
+#include <pbd/shiva.h>
 
 #include "route_ui.h"
 #include "keyboard.h"
@@ -44,7 +46,6 @@ using namespace Gtkmm2ext;
 using namespace ARDOUR;
 using namespace PBD;
 
-
 RouteUI::RouteUI (boost::shared_ptr<ARDOUR::Route> rt, ARDOUR::Session& sess, const char* m_name,
 		  const char* s_name, const char* r_name)
 	: AxisView(sess),
@@ -65,7 +66,8 @@ RouteUI::RouteUI (boost::shared_ptr<ARDOUR::Route> rt, ARDOUR::Session& sess, co
 		set_color (unique_random_color());
 	}
 
-	_route->GoingAway.connect (mem_fun (*this, &RouteUI::route_removed));
+	new Shiva<Route,RouteUI> (*_route, *this);
+
 	_route->active_changed.connect (mem_fun (*this, &RouteUI::route_active_changed));
 
         mute_button = manage (new BindableToggleButton (_route->mute_control(), m_name ));
@@ -95,6 +97,7 @@ RouteUI::RouteUI (boost::shared_ptr<ARDOUR::Route> rt, ARDOUR::Session& sess, co
 
 RouteUI::~RouteUI()
 {
+	GoingAway (); /* EMIT SIGNAL */
 	delete mute_menu;
 }
 
@@ -729,13 +732,6 @@ RouteUI::idle_remove_this_route (RouteUI *rui)
 	return FALSE;
 }
 
-void
-RouteUI::route_removed ()
-{
-	ENSURE_GUI_THREAD(mem_fun (*this, &RouteUI::route_removed));
-	delete this;
-}
-
 void
 RouteUI::route_rename ()
 {

gtk2_ardour/route_ui.h

@@ -153,6 +153,8 @@ class RouteUI : public virtual AxisView
 
 	void reversibly_apply_route_boolean (string name, void (ARDOUR::Route::*func)(bool, void*), bool, void *);
 	void reversibly_apply_audio_track_boolean (string name, void (ARDOUR::AudioTrack::*func)(bool, void*), bool, void *);
+
+	sigc::signal<void> GoingAway;
 };
 
 #endif /* __ardour_route_ui__ */

gtk2_ardour/send_ui.cc

@@ -97,14 +97,6 @@ SendUI::outs_changed (IOChange change, void* ignored)
 	}
 }
 
-void
-SendUI::send_going_away ()
-{
-	ENSURE_GUI_THREAD (mem_fun (*this, &SendUI::send_going_away))
-
-	delete this;
-}
-
 void
 SendUI::update ()
 {
@@ -146,7 +138,6 @@ void
 SendUIWindow::send_going_away ()
 {
 	ENSURE_GUI_THREAD (mem_fun (*this, &SendUIWindow::send_going_away));
-	
-	delete this;
+	delete_when_idle (this);
 }
 

gtk2_ardour/send_ui.h

@@ -54,7 +54,6 @@ class SendUI : public Gtk::HBox
 	sigc::connection screen_update_connection;
 	sigc::connection fast_screen_update_connection;
 		
-	void send_going_away ();
 	void ins_changed (ARDOUR::IOChange, void*);
 	void outs_changed (ARDOUR::IOChange, void*);
 };

libs/ardour/ardour/playlist.h

@@ -168,7 +168,7 @@ class Playlist : public StateManager, public PBD::StatefulDestructible {
 
 	friend class RegionLock;
 
-	RegionList       regions;
+	RegionList       regions;  /* the current list of regions in the playlist */
 	string          _name;
 	Session&        _session;
 	mutable gint    block_notifications;
@@ -221,7 +221,7 @@ class Playlist : public StateManager, public PBD::StatefulDestructible {
 
 	void mark_session_dirty();
 
-	void region_changed_proxy (Change, boost::shared_ptr<Region>);
+	void region_changed_proxy (Change, boost::weak_ptr<Region>);
 	virtual bool region_changed (Change, boost::shared_ptr<Region>);
 
 	void region_bounds_changed (Change, boost::shared_ptr<Region>);

libs/ardour/audio_playlist.cc

@@ -126,7 +126,6 @@ AudioPlaylist::AudioPlaylist (const AudioPlaylist& other, nframes_t start, nfram
 AudioPlaylist::~AudioPlaylist ()
 {
 	set<Crossfade*> all_xfades;
-	set<Region*> all_regions;
 
   	GoingAway (); /* EMIT SIGNAL */
 

libs/ardour/playlist.cc

@@ -532,7 +532,8 @@ Playlist::add_region_internal (boost::shared_ptr<Region> region, nframes_t posit
 		}
 	}
 
-	region->StateChanged.connect (sigc::bind (mem_fun (this, &Playlist::region_changed_proxy), region));
+	region->StateChanged.connect (sigc::bind (mem_fun (this, &Playlist::region_changed_proxy), 
+						  boost::weak_ptr<Region> (region)));
 }
 
 void
@@ -1148,8 +1149,14 @@ Playlist::region_bounds_changed (Change what_changed, boost::shared_ptr<Region>
 }
 
 void
-Playlist::region_changed_proxy (Change what_changed, boost::shared_ptr<Region> region)
+Playlist::region_changed_proxy (Change what_changed, boost::weak_ptr<Region> weak_region)
 {
+	boost::shared_ptr<Region> region (weak_region.lock());
+
+	if (!region) {
+		return;
+	}
+
 	/* this makes a virtual call to the right kind of playlist ... */
 
 	region_changed (what_changed, region);
@@ -1373,21 +1380,15 @@ Playlist::set_state (const XMLNode& node)
 		
 		if (child->name() == "Region") {
 
-#if 0
 			if ((prop = child->property ("id")) == 0) {
 				error << _("region state node has no ID, ignored") << endmsg;
 				continue;
 			}
 			
-			ID id = prop->value ();
-
-			if ((region = region_by_id (id)) == 0) {
-#endif
-				if ((region = RegionFactory::create (_session, *child, true)) == 0) {
-					error << _("Playlist: cannot create region from state file") << endmsg;
-					continue;
-				}
-//			}
+			if ((region = RegionFactory::create (_session, *child, true)) == 0) {
+				error << _("Playlist: cannot create region from state file") << endmsg;
+				continue;
+			}
 
 			add_region (region, region->position(), 1.0, false);
 

libs/ardour/session_state.cc

@@ -1296,8 +1296,6 @@ Session::XMLRegionFactory (const XMLNode& node, bool full)
 		cerr << "no name for this region\n";
 		abort ();
 	}
-	cerr << "name of this region = " << prop->value() << endl;
-
 	
 	if ((prop = node.property (X_("source-0"))) == 0) {
 		if ((prop = node.property ("source")) == 0) {

libs/pbd/pbd/restartable_rw.h

@@ -1,7 +0,0 @@
-#ifndef __libmisc_restartable_rw__h__
-#define __libmisc_restartable_rw__h__
-
-extern int restartable_write (int fd, unsigned char *buf, size_t cnt);
-extern int restartable_read (int fd, unsigned char *buf, size_t cnt);
-
-#endif // __libmisc_restartable_rw__h__

libs/pbd/pbd/shiva.h

@@ -0,0 +1,51 @@
+#ifndef __pbd_shiva_h__
+#define __pbd_shiva_h__
+
+#include <sigc++/sigc++.h>
+
+namespace PBD {
+
+template<typename ObjectWithGoingAway, typename ObjectToBeDestroyed>
+
+/* named after the Hindu god Shiva, The Destroyer */
+
+class Shiva {
+  public:
+	Shiva (ObjectWithGoingAway& emitter, ObjectToBeDestroyed& receiver) {
+
+		/* if the emitter goes away, destroy the receiver */
+
+		_connection1 = emitter.GoingAway.connect 
+			(sigc::bind (sigc::mem_fun 
+				     (*this, &Shiva<ObjectWithGoingAway,ObjectToBeDestroyed>::destroy),
+				     &receiver));
+
+		/* if the receiver goes away, forget all this nonsense */
+
+		_connection2 = receiver.GoingAway.connect 
+			(sigc::mem_fun (*this, &Shiva<ObjectWithGoingAway,ObjectToBeDestroyed>::forget));
+	}
+
+	~Shiva() { 
+		forget ();
+	}
+
+  private:
+	sigc::connection _connection1;
+	sigc::connection _connection2;
+
+	void destroy (ObjectToBeDestroyed* obj) {
+		delete obj;
+		forget ();
+	}
+
+	void forget () {
+		_connection1.disconnect ();
+		_connection2.disconnect ();
+	}
+			
+};
+
+}
+
+#endif /* __pbd_shiva_h__ */