_gsBack _gsFront _lastCenter _lastScale _mgview _view _zoomEnabled _zooming _zoomTimes checkZoomTimes cmdView copyGs deviceView draw dyndraw frontGraph GcBaseView graph isZoomEnabled isZooming onGesture onSize setZoomEnabled submitBackXform twoFingersMove xform ~GcBaseView

onGesture() bool GcBaseView::onGesture ( const MgMotion &  motion ) virtual 传递单指触摸手势消息 这是这个函数的调用关系图: