From 9cef7705d8cb55524279ac2f68cd1c1a3dde4586 Mon Sep 17 00:00:00 2001
From: Uwe Rathmann <Uwe.Rathmann@tigertal.de>
Date: Thu, 30 Dec 2021 11:13:48 +0100
Subject: [PATCH] QskMenu::exec added

---
 examples/qvgviewer/MainWindow.cpp | 20 +++++----
 src/controls/QskMenu.cpp          | 69 +++++++++++++++++++++++++++++++
 src/controls/QskMenu.h            |  2 +
 3 files changed, 82 insertions(+), 9 deletions(-)

diff --git a/examples/qvgviewer/MainWindow.cpp b/examples/qvgviewer/MainWindow.cpp
index 14ce76ab..2c220ffc 100644
--- a/examples/qvgviewer/MainWindow.cpp
+++ b/examples/qvgviewer/MainWindow.cpp
@@ -85,18 +85,20 @@ class GraphicLabel : public QskGraphicLabel
   protected:
     void mousePressEvent( QMouseEvent* event ) override
     {
-        auto menu = new QskMenu( this );
+        QskMenu menu( this );
+        menu.setPopupFlag( QskPopup::DeleteOnClose, false );
 
-        menu->addItem( "image://shapes/Rectangle/White", "Print" );
-        menu->addItem( "image://shapes/Diamond/Yellow", "Save As" );
-        menu->addItem( "image://shapes/Ellipse/Red", "Setup" );
-        menu->addItem( "image://shapes/Hexagon/PapayaWhip", "Help" );
+        menu.addItem( "image://shapes/Rectangle/White", "Print" );
+        menu.addItem( "image://shapes/Diamond/Yellow", "Save As" );
+        menu.addItem( "image://shapes/Ellipse/Red", "Setup" );
+        menu.addItem( "image://shapes/Hexagon/PapayaWhip", "Help" );
 
-        menu->setOrigin( qskMousePosition( event ) );
-        menu->open();
+        menu.setOrigin( qskMousePosition( event ) );
 
-        connect( menu, &QskMenu::triggered,
-                 this, []( int index ) { qDebug() << index; } );
+        if ( int result = menu.exec() )
+        {
+            qDebug() << result;
+        }
     }
 #endif
 };
diff --git a/src/controls/QskMenu.cpp b/src/controls/QskMenu.cpp
index 31357ba3..746b656d 100644
--- a/src/controls/QskMenu.cpp
+++ b/src/controls/QskMenu.cpp
@@ -9,6 +9,7 @@
 
 #include <qvector.h>
 #include <qvariant.h>
+#include <qeventloop.h>
 
 QSK_SUBCONTROL( QskMenu, Panel )
 QSK_SUBCONTROL( QskMenu, Cell )
@@ -37,6 +38,8 @@ class QskMenu::PrivateData
     QPointF origin;
 
     int currentIndex = -1;
+    int triggeredIndex = -1;
+
     bool isPressed = false;
 };
 
@@ -328,7 +331,9 @@ void QskMenu::setSelectedIndex( int index )
     if ( index >= 0 )
         setCurrentIndex( index );
 
+    m_data->triggeredIndex = index;
     Q_EMIT triggered( index );
+
     close();
 }
 
@@ -344,4 +349,68 @@ int QskMenu::indexAtPosition( const QPointF& pos ) const
         this, contentsRect(), QskMenu::Cell, pos );
 }
 
+namespace
+{
+    class EventLoop : public QEventLoop
+    {
+      public:
+        EventLoop( QskMenu* menu )
+            : QEventLoop( menu )
+        {
+            /*
+                We want menu being the parent, so that the loop can be found
+                by menu->findChild< QEventLoop* >(). 
+             */
+            
+            connect( menu, &QObject::destroyed, this, &EventLoop::reject );
+            connect( menu, &QskMenu::fadingChanged, this, &EventLoop::maybeQuit );
+        }
+
+      private:
+        void reject()
+        {
+            setParent( nullptr );
+            quit();
+        }
+
+        void maybeQuit()
+        {
+            auto menu = static_cast< const QskMenu* >( parent() );
+            if ( !menu->isOpen() && !menu->isFading() )
+                quit();
+        }
+    };
+}
+
+int QskMenu::exec()
+{
+    if ( isOpen() || isFading() )
+    {
+        qWarning() << "QskMenu::exec: menu is already opened";
+        return -1;
+    }
+
+    const bool deleteOnClose = popupFlags() & QskPopup::DeleteOnClose;
+    if ( deleteOnClose )
+        setPopupFlag( QskPopup::DeleteOnClose, false );
+
+    QPointer< QskMenu > menu = this;
+    menu->open();
+
+    EventLoop loop( this );
+    (void )loop.exec( QEventLoop::DialogExec );
+
+    int result = -1;
+
+    if ( menu )
+    {
+        result = menu->m_data->triggeredIndex;
+
+        if ( deleteOnClose )
+            delete menu;
+    }
+
+    return result;
+}
+
 #include "moc_QskMenu.cpp"
diff --git a/src/controls/QskMenu.h b/src/controls/QskMenu.h
index f56198b9..fcacc858 100644
--- a/src/controls/QskMenu.h
+++ b/src/controls/QskMenu.h
@@ -66,6 +66,8 @@ class QSK_EXPORT QskMenu : public QskPopup
     QRectF cellRect( int index ) const;
     int indexAtPosition( const QPointF& ) const;
 
+    Q_INVOKABLE int exec();
+
   Q_SIGNALS:
     void cascadingChanged( bool );
     void originChanged( const QPointF& );