Allow to show or hide menu items

examples/MenuBar1.cc

@@ -46,6 +46,7 @@ YDialog	    * dialog		= 0;
 YMenuBar    * menuBar		= 0;
 YLabel	    * lastEventLabel	= 0;
 YCheckBox   * readOnlyCheckBox	= 0;
+YCheckBox   * visibleCheckBox	= 0;
 YPushButton * closeButton	= 0;
 
 
@@ -115,7 +116,6 @@ int main( int argc, char **argv )
     YUILog::enableDebugLogging();
 
     createWidgets();
-    updateActions();
     handleEvents();
 
     dialog->destroy();
@@ -151,7 +151,12 @@ void createWidgets()
     fac->createVSpacing( vbox2, 2 );
     readOnlyCheckBox = fac->createCheckBox( vbox2, "Read &Only", true );
     readOnlyCheckBox->setNotify( true );
+
     fac->createVSpacing( vbox2, 0.2 );
+    visibleCheckBox = fac->createCheckBox( vbox2, "&Visible", true );
+    visibleCheckBox->setNotify( true );
+
+    fac->createVSpacing( vbox2, 1 );
     closeButton = fac->createPushButton( vbox2, "&Close" );
 }
 
@@ -203,6 +208,9 @@ void handleEvents()
 {
     yuiMilestone() << endl;
 
+    dialog->open();
+    updateActions();
+
     while ( true )
     {
 	YEvent * event = dialog->waitForEvent();
@@ -230,6 +238,9 @@ void handleEvents()
 	    if ( event->widget() == readOnlyCheckBox )
 		updateActions();
 
+	    if ( event->widget() == visibleCheckBox )
+		updateActions();
+
 	    if ( event->widget() == closeButton )
 		break;
 	}
@@ -252,8 +263,9 @@ void showEvent( YMenuEvent * event )
 
 
 /**
- * Update the available menu actions: Enable or disable some of them according
- * to the current status of the "Read Only" check box.
+ * Update the available menu actions:
+ *   * Enable or disable some of them according to the current status of the "Read Only" check box.
+ *   * Show or hide some of them according to the current status of the "Visible" check box.
  **/
 void updateActions()
 {
@@ -262,4 +274,9 @@ void updateActions()
     menuBar->setItemEnabled( actionSave,  ! readOnly );
     menuBar->setItemEnabled( actionCut,	  ! readOnly );
     menuBar->setItemEnabled( actionPaste, ! readOnly );
+
+    bool visible = visibleCheckBox->isChecked();
+
+    menuBar->setItemVisible( contentsMenu, visible );
+    menuBar->setItemVisible( actionOpen, visible );
 }

src/YMenuItem.h

@@ -50,6 +50,7 @@ class YMenuItem: public YTreeItem
 	       const std::string & 	iconName = "" )
 	: YTreeItem( label, iconName )
         , _enabled( true )
+	, _visible( true )
         , _uiItem( 0 )
 	{}
 
@@ -67,6 +68,7 @@ class YMenuItem: public YTreeItem
 	       const std::string & 	iconName = "" )
 	: YTreeItem( parent, label, iconName )
         , _enabled( true )
+	, _visible( true )
         , _uiItem( 0 )
 	{}
 
@@ -131,6 +133,20 @@ class YMenuItem: public YTreeItem
      **/
     void setEnabled( bool enabled = true ) { _enabled = enabled; }
 
+    /**
+     * Return 'true' if this item is visible (which is the default).
+     **/
+    bool isVisible() const { return _visible; }
+
+    /**
+     * Show or hide this item.
+     *
+     * Applications should use YMenuWidget::setItemVisible() instead because
+     * that will also notify the widget so it can update the item's visual
+     * representation.
+     **/
+    void setVisible( bool visible = true ) { _visible = visible; }
+
     /**
      * Return the UI counterpart of this item (if the UI set any).
      **/
@@ -154,7 +170,8 @@ class YMenuItem: public YTreeItem
 
     // Data members
 
-    bool   _enabled;
+    bool _enabled;
+    bool _visible;
     void * _uiItem;
 };
 

src/YMenuWidget.cc

@@ -113,6 +113,14 @@ YMenuWidget::setItemEnabled( YMenuItem * item, bool enabled )
 }
 
 
+void
+YMenuWidget::setItemVisible( YMenuItem * item, bool visible )
+{
+    if ( item )
+        item->setVisible( visible );
+}
+
+
 YMenuItem *
 YMenuWidget::findMenuItem( int index )
 {

src/YMenuWidget.h

@@ -124,6 +124,16 @@ class YMenuWidget: public YSelectionWidget
      **/
     virtual void setItemEnabled( YMenuItem * item, bool enabled );
 
+    /**
+     * Show or hide an item. This default implementation only updates the
+     * item's 'visible' field.
+     *
+     * Derived classes should overwrite this method and either update the
+     * item's 'visible' field in their implementation or call this default
+     * implementation.
+     **/
+    virtual void setItemVisible( YMenuItem * item, bool visible );
+
     /**
      * Support for the Rest API for UI testing:
      *