QmlDesigner: allow aborting drag and drop with Escape

Also allows aborting the move tool.

Reviewed-by: Marco Bubke
Task-number: QTCREATORBUG-4322

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

@@ -169,7 +169,6 @@ FormEditorItem* AbstractFormEditorTool::topFormEditorItemWithRootItem(const QLis
 
 void AbstractFormEditorTool::dropEvent(QGraphicsSceneDragDropEvent * /* event */)
 {
-    Q_ASSERT(false);
 }
 
 void AbstractFormEditorTool::dragEnterEvent(QGraphicsSceneDragDropEvent * event)

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

@@ -34,6 +34,7 @@
 
 #include "formeditorscene.h"
 #include "formeditorview.h"
+#include "formeditorwidget.h"
 #include "itemutilfunctions.h"
 #include <customdraganddrop.h>
 #include <metainfo.h>
@@ -62,7 +63,8 @@ DragTool::DragTool(FormEditorView *editorView)
     m_moveManipulator(editorView->scene()->manipulatorLayerItem(), editorView),
     m_selectionIndicator(editorView->scene()->manipulatorLayerItem()),
     m_timerHandler(new Internal::TimerHandler(this)),
-    m_blockMove(false)
+    m_blockMove(false),
+    m_Aborted(false)
 {
 //    view()->setCursor(Qt::SizeAllCursor);
 }
@@ -98,9 +100,13 @@ void DragTool::hoverMoveEvent(const QList<QGraphicsItem*> &,
 
 }
 
-void DragTool::keyPressEvent(QKeyEvent *)
+void DragTool::keyPressEvent(QKeyEvent *event)
 {
-
+    if (event->key() == Qt::Key_Escape) {
+        abort();
+        event->accept();
+        view()->changeToSelectionTool();
+    }
 }
 
 void DragTool::keyReleaseEvent(QKeyEvent *)
@@ -221,6 +227,23 @@ void DragTool::clearMoveDelay()
         beginWithPoint(m_startPoint);
 }
 
+void DragTool::abort()
+{
+    if (m_Aborted)
+        return;
+
+    m_Aborted = true;
+
+    if (m_dragNode.isValid())
+        m_dragNode.destroy();
+
+    QmlDesignerItemLibraryDragAndDrop::CustomDragAndDrop::hide();
+
+    if (m_rewriterTransaction.isValid())
+        m_rewriterTransaction.commit();
+
+}
+
 void DragTool::dropEvent(QGraphicsSceneDragDropEvent * event)
 {
     if (event->mimeData()->hasFormat("application/vnd.bauhaus.itemlibraryinfo") ||
@@ -260,6 +283,8 @@ void DragTool::dragEnterEvent(QGraphicsSceneDragDropEvent * event)
         QList<Import> importToBeAddedList;
         m_blockMove = false;
         if (event->mimeData()->hasFormat("application/vnd.bauhaus.itemlibraryinfo")) {
+            view()->widget()->setFocus();
+            m_Aborted = false;
             Q_ASSERT(!event->mimeData()->data("application/vnd.bauhaus.itemlibraryinfo").isEmpty());
             ItemLibraryEntry itemLibraryEntry = itemLibraryEntryFromData(event->mimeData()->data("application/vnd.bauhaus.itemlibraryinfo"));
             if (!itemLibraryEntry.requiredImport().isEmpty()) {
@@ -309,6 +334,11 @@ void DragTool::dragMoveEvent(QGraphicsSceneDragDropEvent * event)
 {
     if (m_blockMove)
         return;
+
+    if (m_Aborted) {
+        event->ignore();
+        return;
+    }
     if (QmlDesignerItemLibraryDragAndDrop::CustomDragAndDrop::isAnimated())
         return;
     if (event->mimeData()->hasFormat("application/vnd.bauhaus.itemlibraryinfo") ||

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

@@ -108,6 +108,7 @@ public:
     void clearMoveDelay();
 
 protected:
+    void abort();
 
 
 private:
@@ -128,6 +129,7 @@ private:
     QScopedPointer<Internal::TimerHandler> m_timerHandler;
     bool m_blockMove;
     QPointF m_startPoint;
+    bool m_Aborted;
 };
 
 

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

@@ -231,7 +231,6 @@ FormEditorItem *FormEditorScene::addFormEditorItem(const QmlItemNode &qmlItemNod
     return formEditorItem;
 }
 
-
 void FormEditorScene::dropEvent(QGraphicsSceneDragDropEvent * event)
 {
     currentTool()->dropEvent(event);
@@ -345,6 +344,11 @@ bool FormEditorScene::event(QEvent * event)
         case QEvent::GraphicsSceneHoverLeave :
             hoverLeaveEvent(static_cast<QGraphicsSceneHoverEvent *>(event));
             return true;
+        case QEvent::ShortcutOverride :
+            if (static_cast<QKeyEvent*>(event)->key() == Qt::Key_Escape) {
+                currentTool()->keyPressEvent(static_cast<QKeyEvent*>(event));
+                return true;
+            }
         default: return QGraphicsScene::event(event);
     }
 

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

@@ -89,7 +89,6 @@ public:
     void synchronizeState(const QmlItemNode &qmlItemNode);
 
     FormEditorItem* calulateNewParent(FormEditorItem *widget);
-    bool event(QEvent *event);
     LayerItem* manipulatorLayerItem() const;
     LayerItem* formLayerItem() const;
     FormEditorView *editorView() const;
@@ -110,6 +109,7 @@ public slots:
     bool showBoundingRects() const;
 
 protected:
+    bool event(QEvent *event);
     void dropEvent(QGraphicsSceneDragDropEvent * event);
     void dragEnterEvent(QGraphicsSceneDragDropEvent * event);
     void dragLeaveEvent(QGraphicsSceneDragDropEvent * event);

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

@@ -259,6 +259,11 @@ void FormEditorWidget::centerScene()
     m_graphicsView->centerOn(rootItemRect().center());
 }
 
+void FormEditorWidget::setFocus()
+{
+    m_graphicsView->setFocus(Qt::OtherFocusReason);
+}
+
 ZoomAction *FormEditorWidget::zoomAction() const
 {
     return m_zoomAction.data();

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

@@ -82,6 +82,8 @@ public:
     void resetView();
     void centerScene();
 
+    void setFocus();
+
 
 protected:
     void wheelEvent(QWheelEvent *event);

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

@@ -170,7 +170,10 @@ void MoveTool::keyPressEvent(QKeyEvent *event)
         case Qt::Key_Down: m_moveManipulator.moveBy(0.0, moveStep); break;
     }
 
-
+    if (event->key() == Qt::Key_Escape && !m_movingItems.isEmpty()) {
+       event->accept();
+       view()->changeToSelectionTool();
+    }
 }
 
 void MoveTool::keyReleaseEvent(QKeyEvent *keyEvent)