By default show controls on output on if it is hovered by mouse

src/gui/OutputGLCanvas.cpp

@@ -27,7 +27,8 @@ namespace mmp {
 OutputGLCanvas::OutputGLCanvas(MainWindow* mainWindow, QWidget* parent, const QGLWidget* shareWidget, QGraphicsScene* scene)
 : MapperGLCanvas(mainWindow, true, parent, shareWidget, scene),
   _displayCrosshair(false),
-  _displayTestSignal(false)
+  _displayTestSignal(false),
+  _windowIsHovered(false)
 {
   // Disable scrollbars.
   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
@@ -68,7 +69,7 @@ void OutputGLCanvas::drawForeground(QPainter *painter , const QRectF &rect)
     painter->restore();
     glPopMatrix();
   }
-  else
+  else if (MainWindow::window()->displayControls() && _windowIsHovered)
   {
     MapperGLCanvas::drawForeground(painter, rect);
 
@@ -107,6 +108,18 @@ void OutputGLCanvas::drawForeground(QPainter *painter , const QRectF &rect)
 
 }
 
+void OutputGLCanvas::enterEvent(QEvent *event)
+{
+  _windowIsHovered = true;
+  QGraphicsView::enterEvent(event);
+}
+
+void OutputGLCanvas::leaveEvent(QEvent *event)
+{
+  _windowIsHovered = false;
+  QGraphicsView::leaveEvent(event);
+}
+
 void OutputGLCanvas::_drawClassicTestSignal(QPainter* painter)
 {
   const QRect& geo = geometry();

src/gui/OutputGLCanvas.h

@@ -62,6 +62,7 @@ private:
   QBrush _brush_test_signal;
   QImage _palTestCard;
   QImage _ntscTestCard;
+  bool _windowIsHovered;
 
 protected:
   // overriden from QGlWidget:
@@ -69,6 +70,8 @@ protected:
 
   void wheelEvent(QWheelEvent *event);
   void mouseMoveEvent(QMouseEvent *event);
+  void enterEvent(QEvent * event);
+  void leaveEvent(QEvent *event);
 };
 
 }