QmlDesigner: Introduce WeakResizeController

WeakResizeController is a wrapper class for a weak pointer to the
ResizeControllerData.

Change-Id: I9052a26e6a5c29d2e794ceecc33075d3ae9970db
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/components/formeditor/resizecontroller.cpp

@@ -158,6 +158,11 @@ ResizeController::ResizeController(const ResizeController &other)
 
 }
 
+ResizeController::ResizeController(const WeakResizeController &resizeController)
+    : m_data(resizeController.m_data.toStrongRef())
+{
+}
+
 ResizeController::~ResizeController()
 {
 }
@@ -264,11 +269,6 @@ FormEditorItem* ResizeController::formEditorItem() const
     return m_data->formEditorItem.data();
 }
 
-QWeakPointer<ResizeControllerData> ResizeController::weakPointer() const
-{
-    return m_data;
-}
-
 bool ResizeController::isTopLeftHandle(const ResizeHandleItem *handle) const
 {
     return handle == m_data->topLeftItem;
@@ -309,4 +309,41 @@ bool ResizeController::isBottomHandle(const ResizeHandleItem *handle) const
     return handle == m_data->bottomItem;
 }
 
+WeakResizeController ResizeController::toWeakResizeController() const
+{
+    return WeakResizeController(*this);
+}
+
+WeakResizeController::WeakResizeController()
+{
+
+}
+
+WeakResizeController::WeakResizeController(const WeakResizeController &resizeController)
+    : m_data(resizeController.m_data)
+{
+}
+
+WeakResizeController::WeakResizeController(const ResizeController &resizeController)
+    : m_data(resizeController.m_data.toWeakRef())
+{
+}
+
+WeakResizeController::~WeakResizeController()
+{
+}
+
+WeakResizeController &WeakResizeController::operator =(const WeakResizeController &other)
+{
+    if (m_data != other.m_data)
+        m_data = other.m_data;
+
+    return *this;
+}
+
+ResizeController WeakResizeController::toResizeController() const
+{
+    return ResizeController(*this);
+}
+
 }

src/plugins/qmldesigner/components/formeditor/resizecontroller.h

@@ -41,15 +41,17 @@ class LayerItem;
 class ResizeHandleItem;
 
 class ResizeControllerData;
+class WeakResizeController;
+
 
 class ResizeController
 {
+    friend class WeakResizeController;
 public:
-    friend class ResizeHandleItem;
-
     ResizeController();
     ResizeController(LayerItem *layerItem, FormEditorItem *formEditorItem);
     ResizeController(const ResizeController &resizeController);
+    ResizeController(const WeakResizeController &resizeController);
     ~ResizeController();
 
     ResizeController& operator=(const ResizeController &other);
@@ -73,13 +75,32 @@ public:
     bool isRightHandle(const ResizeHandleItem *handle) const;
     bool isBottomHandle(const ResizeHandleItem *handle) const;
 
+    WeakResizeController toWeakResizeController() const;
+
+
 private: // functions
     ResizeController(const QSharedPointer<ResizeControllerData> &data);
-    QWeakPointer<ResizeControllerData> weakPointer() const;
 private: // variables
     QSharedPointer<ResizeControllerData> m_data;
 };
 
+class WeakResizeController
+{
+    friend class ResizeController;
+public:
+    WeakResizeController();
+    WeakResizeController(const WeakResizeController &resizeController);
+    WeakResizeController(const ResizeController &resizeController);
+    ~WeakResizeController();
+
+    WeakResizeController& operator=(const WeakResizeController &other);
+
+    ResizeController toResizeController() const;
+
+private: // variables
+    QWeakPointer<ResizeControllerData> m_data;
+};
+
 }
 
 #endif // RESIZECONTROLLER_H

src/plugins/qmldesigner/components/formeditor/resizehandleitem.cpp

@@ -36,7 +36,7 @@ namespace QmlDesigner {
 
 ResizeHandleItem::ResizeHandleItem(QGraphicsItem *parent, const ResizeController &resizeController)
     : QGraphicsPixmapItem(QPixmap(":/icon/handle/resize_handle.png"), parent),
-    m_resizeControllerData(resizeController.weakPointer())
+    m_weakResizeController(resizeController.toWeakResizeController())
 {
     setShapeMode(QGraphicsPixmapItem::BoundingRectShape);
     setOffset(-pixmap().rect().center());
@@ -44,6 +44,10 @@ ResizeHandleItem::ResizeHandleItem(QGraphicsItem *parent, const ResizeController
     setFlag(QGraphicsItem::ItemIgnoresTransformations, true);
 }
 
+ResizeHandleItem::~ResizeHandleItem()
+{
+}
+
 void ResizeHandleItem::setHandlePosition(const QPointF & globalPosition, const QPointF & itemSpacePosition)
 {
     m_itemSpacePosition = itemSpacePosition;
@@ -62,8 +66,7 @@ QPainterPath ResizeHandleItem::shape() const
 
 ResizeController ResizeHandleItem::resizeController() const
 {
-    Q_ASSERT(!m_resizeControllerData.isNull());
-    return ResizeController(m_resizeControllerData.toStrongRef());
+    return ResizeController(m_weakResizeController.toResizeController());
 }
 
 ResizeHandleItem* ResizeHandleItem::fromGraphicsItem(QGraphicsItem *item)

src/plugins/qmldesigner/components/formeditor/resizehandleitem.h

@@ -48,7 +48,7 @@ public:
 
 
     ResizeHandleItem(QGraphicsItem *parent, const ResizeController &resizeController);
-
+    ~ResizeHandleItem();
     void setHandlePosition(const QPointF & globalPosition, const QPointF & itemSpacePosition);
 
     int type() const;
@@ -72,7 +72,7 @@ public:
     QPointF itemSpacePosition() const;
 
 private:
-    QWeakPointer<ResizeControllerData> m_resizeControllerData;
+    WeakResizeController m_weakResizeController;
     QPointF m_itemSpacePosition;
 };