Improve drag&drop handling

include/vlc_playlist.h

@@ -368,7 +368,8 @@ VLC_EXPORT( playlist_item_t*, playlist_ItemToNode, (playlist_t *,playlist_item_t
 VLC_EXPORT( playlist_item_t*, playlist_LockItemToNode, (playlist_t *,playlist_item_t *) );
 
 playlist_item_t *playlist_ItemFindFromInputAndRoot( playlist_t *p_playlist,
-                                   int i_input_id, playlist_item_t *p_root );
+                                   int i_input_id, playlist_item_t *p_root,
+                                   vlc_bool_t );
 
 /********************************** Item search *************************/
 VLC_EXPORT( playlist_item_t *, playlist_ItemGetById, (playlist_t *, int) );

modules/gui/qt4/components/interface_widgets.cpp

@@ -300,7 +300,12 @@ PlaylistWidget::PlaylistWidget( intf_thread_t *_p_intf ) :
 
     CONNECT( selector, activated( int ), rightPanel, setRoot( int ) );
 
-    CONNECT( qobject_cast<StandardPLPanel *>(rightPanel)->model, artSet( QString ) , this, setArt( QString ) );
+    CONNECT( qobject_cast<StandardPLPanel *>(rightPanel)->model,
+             artSet( QString ) , this, setArt( QString ) );
+    /* Forward removal requests from the selector to the main panel */
+    CONNECT( qobject_cast<PLSelector *>(selector)->model,
+             shouldRemove( int ),
+             qobject_cast<StandardPLPanel *>(rightPanel), removeItem(int) );
 
     connect( selector, SIGNAL(activated( int )),
              this, SIGNAL( rootChanged( int ) ) );

modules/gui/qt4/components/playlist/panels.hpp

@@ -75,6 +75,7 @@ private:
     ClickLineEdit *searchLine;
     int currentRootId;
 public slots:
+    void removeItem( int );
     virtual void setRoot( int );
 private slots:
     void deleteSelection();

modules/gui/qt4/components/playlist/selector.hpp

@@ -48,6 +48,7 @@ private slots:
     void setSource( const QModelIndex& );
 signals:
     void activated( int );
+    void shouldRemove( int );
 };
 
 #endif

modules/gui/qt4/components/playlist/standardpanel.cpp

@@ -217,6 +217,11 @@ void StandardPLPanel::setRoot( int i_root_id )
     model->rebuild( p_item );
 }
 
+void StandardPLPanel::removeItem( int i_id )
+{
+    model->removeItem( i_id );
+}
+
 void StandardPLPanel::keyPressEvent( QKeyEvent *e )
 {
     switch( e->key() )

modules/gui/qt4/playlist_model.cpp

@@ -251,7 +251,6 @@ bool PLModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
                 PL_UNLOCK;
                 return false;
             }
-
             if( p_target->i_children == -1 ) /* A leaf */
             {
                 PLItem *parentItem = targetItem->parent();
@@ -276,8 +275,16 @@ bool PLModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
                 newParentItem = targetItem;
             }
             /* Remove from source */
-            PLItem *srcItem = FindByInput( rootItem, p_src->p_input->i_id );
-            srcItem->remove( srcItem );
+            PLItem *srcItem = FindById( rootItem, p_src->i_id );
+            // We dropped on the source selector. Ask the dialog to forward
+            // to the main view
+            if( !srcItem )
+            {
+                emit shouldRemove( p_src->i_id );
+            }
+            else
+                srcItem->remove( srcItem );
+
             /* Display at new destination */
             PLItem *newItem = new PLItem( p_src, newParentItem, this );
             newParentItem->insertChild( newItem, i, true );
@@ -288,8 +295,13 @@ bool PLModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
         }
     }
     return true;
- }
+}
 
+void PLModel::removeItem( int i_id )
+{
+    PLItem *item = FindById( rootItem,i_id );
+    if( item ) item->remove( item );
+}
 
 void PLModel::addCallbacks()
 {

modules/gui/qt4/playlist_model.hpp

@@ -123,6 +123,7 @@ public:
     void doDelete( QModelIndexList selected );
     void search( QString search );
     void sort( int column, Qt::SortOrder order );
+    void removeItem( int );
 
     /* DnD handling */
     Qt::DropActions supportedDropActions() const;
@@ -172,6 +173,7 @@ private:
     int i_cached_input_id;
 signals:
     void artSet( QString );
+    void shouldRemove( int );
 public slots:
     void activateItem( const QModelIndex &index );
     void activateItem( playlist_item_t *p_item );

src/playlist/item.c

@@ -386,13 +386,15 @@ playlist_item_t *playlist_ItemToNode( playlist_t *p_playlist,
     /** \todo First look if we don't already have it */
     p_item_in_category = playlist_ItemFindFromInputAndRoot(
                                             p_playlist, p_item->p_input->i_id,
-                                            p_playlist->p_root_category );
+                                            p_playlist->p_root_category,
+                                            VLC_TRUE );
 
     if( p_item_in_category )
     {
         playlist_item_t *p_item_in_one = playlist_ItemFindFromInputAndRoot(
                                             p_playlist, p_item->p_input->i_id,
-                                            p_playlist->p_root_onelevel );
+                                            p_playlist->p_root_onelevel,
+                                            VLC_TRUE );
         ChangeToNode( p_playlist, p_item_in_category );
         if( p_item_in_one->p_parent == p_playlist->p_root_onelevel )
             ChangeToNode( p_playlist, p_item_in_one );
@@ -432,12 +434,13 @@ playlist_item_t * playlist_LockItemToNode( playlist_t *p_playlist,
  */
 playlist_item_t *playlist_ItemFindFromInputAndRoot( playlist_t *p_playlist,
                                                     int i_input_id,
-                                                    playlist_item_t *p_root )
+                                                    playlist_item_t *p_root,
+                                                    vlc_bool_t b_items_only )
 {
     int i;
     for( i = 0 ; i< p_root->i_children ; i++ )
     {
-        if( p_root->pp_children[i]->i_children == -1 &&
+        if( ( b_items_only ? p_root->pp_children[i]->i_children == -1 : 1 ) &&
             p_root->pp_children[i]->p_input->i_id == i_input_id )
         {
             return p_root->pp_children[i];
@@ -446,7 +449,8 @@ playlist_item_t *playlist_ItemFindFromInputAndRoot( playlist_t *p_playlist,
         {
             playlist_item_t *p_search =
                  playlist_ItemFindFromInputAndRoot( p_playlist, i_input_id,
-                                                    p_root->pp_children[i] );
+                                                    p_root->pp_children[i],
+                                                    b_items_only );
             if( p_search ) return p_search;
         }
     }
@@ -454,6 +458,26 @@ playlist_item_t *playlist_ItemFindFromInputAndRoot( playlist_t *p_playlist,
 }
 
 
+static int TreeMove( playlist_t *p_playlist, playlist_item_t *p_item,
+                     playlist_item_t *p_node, int i_newpos )
+{
+    int j;
+    playlist_item_t *p_detach = p_item->p_parent;
+    if( p_node->i_children == -1 ) return VLC_EGENERIC;
+
+    for( j = 0; j < p_detach->i_children; j++ )
+    {
+         if( p_detach->pp_children[j] == p_item ) break;
+    }
+    REMOVE_ELEM( p_detach->pp_children, p_detach->i_children, j );
+
+    /* Attach to new parent */
+    INSERT_ELEM( p_node->pp_children, p_node->i_children, i_newpos, p_item );
+    p_item->p_parent = p_node;
+
+    return VLC_SUCCESS;
+}
+
 /**
  * Moves an item
  *
@@ -468,23 +492,41 @@ playlist_item_t *playlist_ItemFindFromInputAndRoot( playlist_t *p_playlist,
 int playlist_TreeMove( playlist_t * p_playlist, playlist_item_t *p_item,
                        playlist_item_t *p_node, int i_newpos )
 {
-    int j;
-    playlist_item_t *p_detach = NULL;
-
-    if( p_node->i_children == -1 ) return VLC_EGENERIC;
-
-    p_detach = p_item->p_parent;
-    for( j = 0; j < p_detach->i_children; j++ )
+    /* Drop on a top level node. Move in the two trees */
+    if( p_node->p_parent == p_playlist->p_root_category ||
+        p_node->p_parent == p_playlist->p_root_onelevel )
     {
-         if( p_detach->pp_children[j] == p_item ) break;
+        /* Fixme: avoid useless lookups but we need some clean helpers */
+        {
+            playlist_item_t *p_node_onelevel;
+            playlist_item_t *p_item_onelevel;
+            p_node_onelevel = playlist_ItemFindFromInputAndRoot( p_playlist,
+                                                p_node->p_input->i_id,
+                                                p_playlist->p_root_onelevel,
+                                                VLC_FALSE );
+            p_item_onelevel = playlist_ItemFindFromInputAndRoot( p_playlist,
+                                                p_item->p_input->i_id,
+                                                p_playlist->p_root_onelevel,
+                                                VLC_FALSE );
+            TreeMove( p_playlist, p_item_onelevel, p_node_onelevel, 0 );
+        }
+        {
+            playlist_item_t *p_node_category;
+            playlist_item_t *p_item_category;
+            p_node_category = playlist_ItemFindFromInputAndRoot( p_playlist,
+                                                p_node->p_input->i_id,
+                                                p_playlist->p_root_category,
+                                                VLC_FALSE );
+            p_item_category = playlist_ItemFindFromInputAndRoot( p_playlist,
+                                                p_item->p_input->i_id,
+                                                p_playlist->p_root_category,
+                                                VLC_FALSE );
+            TreeMove( p_playlist, p_item_category, p_node_category, 0 );
+        }
+        return VLC_SUCCESS;
     }
-    REMOVE_ELEM( p_detach->pp_children, p_detach->i_children, j );
-
-    /* Attach to new parent */
-    INSERT_ELEM( p_node->pp_children, p_node->i_children, i_newpos, p_item );
-    p_item->p_parent = p_node;
-
-    return VLC_SUCCESS;
+    else
+        return TreeMove( p_playlist, p_item, p_node, i_newpos );
 }
 
 /** Send a notification that an item has been added to a node */