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#include?“graphicsview.h“

#include?
#include?

GraphicsView::GraphicsView（QGraphicsScene?*scene?QWidget?*parent）
????:?QGraphicsView（scene?parent）?totalScaleFactor（1）
{
????viewport（）->setAttribute（Qt::WA_AcceptTouchEvents）;
????setDragMode（ScrollHandDrag）;
}

bool?GraphicsView::viewportEvent（QEvent?*event）
{
????switch?（event->type（））?{
????case?QEvent::TouchBegin:
????case?QEvent::TouchUpdate:
????case?QEvent::TouchEnd:
????{
????????QTouchEvent?*touchEvent?=?static_cast（event）;
????????QList