private static void BeginTiltEffect(FrameworkElement element, Point touchPoint, Point centerPoint, Point centerDelta)
{
if (TiltEffect.tiltReturnStoryboard != null)
{
TiltEffect.StopTiltReturnStoryboardAndCleanup();
}
if (!TiltEffect.PrepareControlForTilt(element, centerDelta))
{
return;
}
TiltEffect.currentTiltElement = element;
TiltEffect.currentTiltElementCenter = centerPoint;
TiltEffect.PrepareTiltReturnStoryboard(element);
TiltEffect.ApplyTiltEffect(TiltEffect.currentTiltElement, touchPoint, TiltEffect.currentTiltElementCenter);
}
private static void ContinueTiltEffect(FrameworkElement element, ManipulationDeltaEventArgs e)
{
FrameworkElement frameworkElement = e.ManipulationContainer as FrameworkElement;
if (frameworkElement == null || element == null)
{
return;
}
Point point = frameworkElement.TransformToVisual((UIElement)element).Transform(e.ManipulationOrigin);
if (!new Rect(0.0, 0.0, TiltEffect.currentTiltElement.ActualWidth, TiltEffect.currentTiltElement.ActualHeight).Contains(point))
{
TiltEffect.PauseTiltEffect();
}
else
{
TiltEffect.ApplyTiltEffect(TiltEffect.currentTiltElement, point, TiltEffect.currentTiltElementCenter);
}
}
private static void ContinueTiltEffect(FrameworkElement element, ManipulationDeltaEventArgs e)
{
FrameworkElement manipulationContainer = e.ManipulationContainer as FrameworkElement;
if (manipulationContainer == null || element == null)
{
return;
}
Point touchPoint = ((UIElement)manipulationContainer).TransformToVisual((UIElement)element).Transform(e.ManipulationOrigin);
Rect rect = new Rect(0.0, 0.0, TiltEffect.currentTiltElement.ActualWidth, TiltEffect.currentTiltElement.ActualHeight);
// ISSUE: explicit reference operation
if (!rect.Contains(touchPoint))
{
TiltEffect.PauseTiltEffect();
}
else
{
TiltEffect.ApplyTiltEffect(TiltEffect.currentTiltElement, touchPoint, TiltEffect.currentTiltElementCenter);
}
}