src/control/media_list.c: Handle meta changed event from its items.

src/control/media_list.c

@@ -30,10 +30,12 @@
  * Private functions
  */
 
+
+
 /**************************************************************************
  *       notify_item_addition (private)
  *
- * Call parent playlist and send the appropriate event.
+ * Do the appropriate action when an item is deleted.
  **************************************************************************/
 static void
 notify_item_addition( libvlc_media_list_t * p_mlist,
@@ -42,17 +44,19 @@ notify_item_addition( libvlc_media_list_t * p_mlist,
 {
     libvlc_event_t event;
 
+    /* Construct the event */
     event.type = libvlc_MediaListItemAdded;
     event.u.media_list_item_added.item = p_md;
     event.u.media_list_item_added.index = index;
 
+    /* Send the event */
     libvlc_event_send( p_mlist->p_event_manager, &event );
 }
 
 /**************************************************************************
  *       notify_item_deletion (private)
  *
- * Call parent playlist and send the appropriate event.
+ * Do the appropriate action when an item is added.
  **************************************************************************/
 static void
 notify_item_deletion( libvlc_media_list_t * p_mlist,
@@ -61,13 +65,69 @@ notify_item_deletion( libvlc_media_list_t * p_mlist,
 {
     libvlc_event_t event;
 
+    /* Construct the event */
     event.type = libvlc_MediaListItemDeleted;
     event.u.media_list_item_deleted.item = p_md;
     event.u.media_list_item_deleted.index = index;
 
+    /* Send the event */
     libvlc_event_send( p_mlist->p_event_manager, &event );
 }
 
+/**************************************************************************
+ *       media_descriptor_changed (private) (libvlc Event Callback )
+ *
+ * An item has changed.
+ **************************************************************************/
+static void
+media_descriptor_changed( const libvlc_event_t * p_event, void * user_data )
+{
+    libvlc_media_list_t * p_mlist = user_data;
+    libvlc_media_descriptor_t * p_md = p_event->p_obj;
+    libvlc_event_t event;
+    
+    /* Construct the new media list event */
+    event.type = libvlc_MediaListItemChanged;
+    event.u.media_list_item_changed.item = p_md;
+
+    /* XXX: this is not good, but there is a solution in the pipeline */
+    event.u.media_list_item_changed.index =
+        libvlc_media_list_index_of_item( p_mlist, p_md, NULL );
+
+    /* Send the event */
+    libvlc_event_send( p_mlist->p_event_manager, &event );
+}
+
+/**************************************************************************
+ *       install_media_descriptor_observer (private)
+ *
+ * Do the appropriate action when an item is deleted.
+ **************************************************************************/
+static void
+install_media_descriptor_observer( libvlc_media_list_t * p_mlist,
+                                   libvlc_media_descriptor_t * p_md )
+{
+    libvlc_event_attach( p_md->p_event_manager,
+                         libvlc_MediaDescriptorMetaChanged,
+                         media_descriptor_changed,
+                         p_mlist, NULL );
+}
+
+/**************************************************************************
+ *       uninstall_media_descriptor_observer (private)
+ *
+ * Do the appropriate action when an item is deleted.
+ **************************************************************************/
+static void
+uninstall_media_descriptor_observer( libvlc_media_list_t * p_mlist,
+                                     libvlc_media_descriptor_t * p_md )
+{
+    libvlc_event_detach( p_md->p_event_manager,
+                         libvlc_MediaDescriptorMetaChanged,
+                         media_descriptor_changed,
+                         p_mlist, NULL );
+}
+
 /**************************************************************************
  *       dynamic_list_propose_item (private) (Event Callback)
  *
@@ -223,6 +283,7 @@ void libvlc_media_list_release( libvlc_media_list_t * p_mlist )
     libvlc_event_manager_release( p_mlist->p_event_manager );
 
     FOREACH_ARRAY( p_md, p_mlist->items )
+        uninstall_media_descriptor_observer( p_mlist, p_md );
         libvlc_media_descriptor_release( p_md );
     FOREACH_END()
  
@@ -264,9 +325,9 @@ void libvlc_media_list_add_media_descriptor(
 {
     (void)p_e;
     libvlc_media_descriptor_retain( p_md );
-    
     ARRAY_APPEND( p_mlist->items, p_md );
     notify_item_addition( p_mlist, p_md, p_mlist->items.i_size-1 );
+    install_media_descriptor_observer( p_mlist, p_md );
 }
 
 /**************************************************************************
@@ -285,6 +346,7 @@ void libvlc_media_list_insert_media_descriptor(
 
     ARRAY_INSERT( p_mlist->items, p_md, index);
     notify_item_addition( p_mlist, p_md, index );
+    install_media_descriptor_observer( p_mlist, p_md );
 }
 
 /**************************************************************************
@@ -300,6 +362,8 @@ void libvlc_media_list_remove_index( libvlc_media_list_t * p_mlist,
 
     p_md = ARRAY_VAL( p_mlist->items, index );
 
+    uninstall_media_descriptor_observer( p_mlist, p_md );
+
     ARRAY_REMOVE( p_mlist->items, index )
     notify_item_deletion( p_mlist, p_md, index );