skins2: use enum type for better clarity

modules/gui/skins2/controls/ctrl_tree.cpp

@@ -140,21 +140,24 @@ int CtrlTree::maxItems()
 void CtrlTree::onUpdate( Subject<VarTree, tree_update> &rTree,
                          tree_update *arg )
 {
-    if( arg->i_type == 0 ) // Item update
+    if( arg->type == arg->UpdateItem ) // Item update
     {
         if( arg->b_active_item )
             autoScroll();
-        makeImage();
-        notifyLayout();
+        if( isItemVisible( arg->i_id ) )
+        {
+            makeImage();
+            notifyLayout();
+        }
     }
-    else if ( arg->i_type == 1 ) // Global change or deletion
+    else if ( arg->type == arg->ResetAll ) // Global change or deletion
     {
         m_firstPos = m_flat ? m_rTree.firstLeaf() : m_rTree.begin();
 
         makeImage();
         notifyLayout();
     }
-    else if ( arg->i_type == 2 ) // Item-append
+    else if ( arg->type == arg->AppendItem ) // Item-append
     {
         if( m_flat && m_firstPos->size() )
         {
@@ -169,7 +172,7 @@ void CtrlTree::onUpdate( Subject<VarTree, tree_update> &rTree,
             notifyLayout();
         }
     }
-    else if( arg->i_type == 3 ) // item-del
+    else if( arg->type == arg->DeleteItem ) // item-del
     {
         /* Make sure firstPos is valid */
         VarTree::Iterator it_old = m_firstPos;

modules/gui/skins2/utils/var_tree.hpp

@@ -35,9 +35,18 @@
 /// Description of an update to the tree
 typedef struct tree_update
 {
-     int i_type;
-     int i_id;
-     bool b_active_item;
+    enum type_t
+    {
+        UpdateItem,
+        AppendItem,
+        DeleteItem,
+        ResetAll,
+    };
+
+    enum type_t type;
+    int i_id;
+    bool b_active_item;
+
 } tree_update;
 
 /// Tree variable

modules/gui/skins2/vars/playtree.cpp

@@ -57,7 +57,7 @@ void Playtree::delSelected()
     }
     /// \todo Do this better (handle item-deleted)
     tree_update descr;
-    descr.i_type = 3;
+    descr.type = tree_update::DeleteItem;
     notify( &descr );
     it = begin();
     while( it != end() )
@@ -114,7 +114,7 @@ void Playtree::onChange()
 {
     buildTree();
     tree_update descr;
-    descr.i_type = 1;
+    descr.type = tree_update::ResetAll;
     notify( &descr );
 }
 
@@ -129,7 +129,7 @@ void Playtree::onUpdateItem( int id )
         it->setString( UStringPtr( pName ) );
 
         tree_update descr;
-        descr.i_type = 0;
+        descr.type = tree_update::UpdateItem;
         descr.i_id = id;
         descr.b_active_item = false;
         notify( &descr );
@@ -149,7 +149,7 @@ void Playtree::onUpdateCurrent( bool b_active )
            it->setPlaying( false );
 
            tree_update descr;
-           descr.i_type = 0;
+           descr.type = tree_update::UpdateItem;
            descr.i_id = it->getId();
            descr.b_active_item = false;
            notify( &descr );
@@ -175,7 +175,7 @@ void Playtree::onUpdateCurrent( bool b_active )
         playlist_Unlock( m_pPlaylist );
 
         tree_update descr;
-        descr.i_type = 0;
+        descr.type = tree_update::UpdateItem;
         descr.i_id = current->i_id;
         descr.b_active_item = true;
         notify( &descr );
@@ -192,7 +192,7 @@ void Playtree::onDelete( int i_id )
         item->setDeleted( true );
 
         tree_update descr;
-        descr.i_type = 3;
+        descr.type = tree_update::DeleteItem;
         descr.i_id = i_id;
         notify( &descr );
 
@@ -223,7 +223,7 @@ void Playtree::onAppend( playlist_add_t *p_add )
         playlist_Unlock( m_pPlaylist );
 
         tree_update descr;
-        descr.i_type = 2;
+        descr.type = tree_update::AppendItem;
         descr.i_id = p_add->i_item;
         notify( &descr );
     }