private void StopPanning()
{
if (mScrollOrigin != null && ImagePopup != null && ImagePopup.Child != null)
{
//Stop the panning scroller
mScroller.Stop();
mScroller.Tick -= OnScrollerTick;
mScroller = null;
//Remove the pan origin
AdornerLayer.GetAdornerLayer(ImagePopup.Child).Remove(mScrollOrigin);
mScrollOrigin = null;
//Stop showing the panning cursor
Mouse.OverrideCursor = null;
}
}
private void StartPanning()
{
if (mScrollOrigin == null && ImagePopup != null && ImagePopup.Child != null && ImageDisplay != null && ImagePopupZoom != null)
{
//Show the pan origin
Point location = ImageDisplay.TranslatePoint(mMouseDownLocation, ImagePopup.Child);
mScrollOrigin = new ScrollOrigin(ImagePopup.Child, location);
AdornerLayer.GetAdornerLayer(ImagePopup.Child).Add(mScrollOrigin);
//Show the panning cursor
SetPanning(PanDirection.None, 0D);
//Start the panning scroller
System.Diagnostics.Debug.Assert(mScroller == null, "Only one scroller timer should exist at any time");
mScroller = new DispatcherTimer(sPanScrollRate, DispatcherPriority.Input, OnScrollerTick, Dispatcher);
}
}
