added signal mouseReleased. it is emitted when the nibble is released.

source/RobotAPI/gui_plugins/PlatformUnitPlugin/JoystickControlWidget.cpp

@@ -61,6 +61,7 @@ namespace armarx
     void JoystickControlWidgetQGraphicsView::mouseReleaseEvent(QMouseEvent*)
     {
         emit positionChanged({0,0});
+        emit released();
     }
 
     JoystickControlWidget::JoystickControlWidget(bool useQuadrant3and4, QWidget *parent) :
@@ -95,6 +96,7 @@ namespace armarx
 
         //connect
         connect(viewPtr.get(), SIGNAL(positionChanged(QPointF)), this, SLOT(setNibble(QPointF)));
+        connect(viewPtr.get(), SIGNAL(released()), this, SLOT(mouseReleased()));
 
         //set gui
         std::unique_ptr<QVBoxLayout> layout{new QVBoxLayout{}};
@@ -135,6 +137,12 @@ namespace armarx
         }
     }
 
+    void JoystickControlWidget::mouseReleased()
+    {
+        setNibble({0,0});
+        emit released();
+    }
+
     void JoystickControlWidget::setNibble(QPointF pos)
     {
         if(onlyQuadrant2and1 && (pos.y()>0))

source/RobotAPI/gui_plugins/PlatformUnitPlugin/JoystickControlWidget.h

@@ -75,6 +75,11 @@ namespace armarx
              * On mouse release (0;0) is send.
              */
             void positionChanged(QPointF);
+
+            /**
+             * @brief Emitted when the mouse was released.
+             */
+            void released();
     };//JoystickControlWidgetQGraphicsView
 
     /**
@@ -158,6 +163,11 @@ namespace armarx
              */
             void rotationChanged(double);
 
+            /**
+             * @brief Emitted when the nibble was released.
+             */
+            void released();
+
         protected:
             virtual void resizeEvent(QResizeEvent * event);
 
@@ -168,6 +178,12 @@ namespace armarx
              */
             void setNibble(QPointF pos);
 
+            /**
+             * @brief Called when the nibble is released.
+             * Emits released() and sets the Position to 0.
+             */
+            void mouseReleased();
+
         private:
             /**
              * @brief The view containing the scene.