+ if (event->type() == QEvent::TouchBegin) {
+ setDragMode(QGraphicsView::ScrollHandDrag);
+ setInteractive(false);
+ if (verticalScrollBar()->isVisible()) return true; //if scrollbar is not visible we need to request backlog below
+ }
+
+#if QT_VERSION >= 0x050000
+ if (event->type() == QEvent::TouchEnd || event->type() == QEvent::TouchCancel) {
+#else
+ if (event->type() == QEvent::TouchEnd) {
+#endif
+ setDragMode(QGraphicsView::NoDrag);
+ setInteractive(true);
+ _firstTouchUpdateHappened = false;
+ return true;
+ }
+
+ if (event->type() == QEvent::TouchUpdate) {
+ if (!_firstTouchUpdateHappened) {
+ QTouchEvent::TouchPoint p = ((QTouchEvent*)event)->touchPoints().at(0);
+ double dx = abs (p.lastPos().x() - p.pos().x());
+ double dy = abs (p.lastPos().y() - p.pos().y());
+ if (dx > dy) {
+ setDragMode(QGraphicsView::NoDrag);
+ setInteractive(true);
+ }
+ _firstTouchUpdateHappened = true;
+ }
+ }
+
+ if (event->type() == QEvent::Wheel || event->type() == QEvent::TouchBegin || event->type() == QEvent::TouchUpdate) {