Qt: limit the number of entries in the right click to 25

Close #6103
(cherry picked from commit 6241fbf7201744c8eafd32b660ba1156f14a758d)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/menus.cpp

@@ -1083,7 +1083,7 @@ void VLCMenuBar::PopupMenu( intf_thread_t *p_intf, bool show )
     }
 
     /* */
-    QMenuView *plMenu = new QMenuView( menu );
+    QMenuView *plMenu = new QMenuView( menu, 25 );
     plMenu->setTitle( qtr("Playlist") );
     PLModel *model = PLModel::getPLModel( p_intf );
     plMenu->setModel( model );

modules/gui/qt4/util/qmenuview.cpp

@@ -37,15 +37,14 @@
  *
  * This is now linked to VLC's models. It should be splittable in the future.
  *
- * TODO: - limit the number of the menu, as a Q_PROPERTY
- *       - limit the width of the entries
+ * TODO: - limit the width of the entries
  *       - deal with a root item
  ***/
 
 Q_DECLARE_METATYPE(QModelIndex); // So we can store it in a QVariant
 
-QMenuView::QMenuView( QWidget * parent )
-          : QMenu( parent )
+QMenuView::QMenuView( QWidget * parent, int _iMaxVisibleCount )
+          : QMenu( parent ), iMaxVisibleCount( _iMaxVisibleCount )
 {
     m_model = NULL;
 
@@ -75,7 +74,9 @@ void QMenuView::rebuild()
 /* */
 void QMenuView::build( const QModelIndex &parent )
 {
-    for( int i = 0; i < m_model->rowCount( parent ); i++ )
+    int i_count = iMaxVisibleCount == 0 ? m_model->rowCount( parent )
+                                         : __MIN( iMaxVisibleCount, m_model->rowCount( parent ) );
+    for( int i = 0; i < i_count; i++ )
     {
         QModelIndex idx = m_model->index(i, 0, parent);
         if( m_model->hasChildren( idx ) )

modules/gui/qt4/util/qmenuview.hpp

@@ -32,13 +32,16 @@ class QMenuView : public QMenu
     Q_OBJECT;
 
 public:
-    QMenuView( QWidget * parent = 0 );
+    QMenuView( QWidget * parent = 0, int iMaxVisibleCount = 0 );
     virtual ~QMenuView(){}
 
     /* Model */
     void setModel( QAbstractItemModel * model ) { m_model = model; }
     QAbstractItemModel * model() const { return m_model; }
 
+    /* Size limit */
+    void setMaximumItemCount( int count ) { iMaxVisibleCount = count; }
+
 private:
     QAbstractItemModel *m_model;
 
@@ -46,6 +49,8 @@ private:
 
     void build( const QModelIndex &parent );
 
+    int iMaxVisibleCount;
+
 private slots:
     void rebuild();
     void activate(QAction*);