/// <summary>
/// Prepares a control to be tilted by setting up a plane projection and
/// some event handlers.
/// </summary>
/// <param name="element">The control that is to be tilted.</param>
/// <param name="centerDelta">Delta between the element's center and the
/// tilt container's.</param>
/// <returns>true if successful; false otherwise.</returns>
/// <remarks>
/// This method is conservative; it will fail any attempt to tilt a
/// control that already has a projection on it.
/// </remarks>
private static bool PrepareControlForTilt(FrameworkElement element, Point centerDelta, Pointer p)
{
// Prevents interference with any existing transforms
if (element.Projection != null || (element.RenderTransform != null && element.RenderTransform.GetType() != typeof(MatrixTransform)))
{
return false;
}
_originalCacheMode[element] = element.CacheMode;
element.CacheMode = new BitmapCache();
TranslateTransform transform = new TranslateTransform();
transform.X = centerDelta.X;
transform.Y = centerDelta.Y;
element.RenderTransform = transform;
PlaneProjection projection = new PlaneProjection();
projection.GlobalOffsetX = -1 * centerDelta.X;
projection.GlobalOffsetY = -1 * centerDelta.Y;
element.Projection = projection;
element.PointerMoved += TiltEffect_PointerMoved;
element.PointerReleased += TiltEffect_PointerReleased;
element.CapturePointer(p);
return true;
}
private void OnPointerPressed(object sender, Windows.UI.Xaml.Input.PointerRoutedEventArgs args)
{
if (args.Pointer.PointerDeviceType == Windows.Devices.Input.PointerDeviceType.Pen)
{
return;
}
_target.Opacity = this.SelectionOpacity;
var indexes = new List <int>();
Panel panel = _target.FindVisualParent <Panel>();
if (panel != null)
{
foreach (UIElement element in panel.Children)
{
if (element != _target as UIElement)
{
indexes.Add(Canvas.GetZIndex(element));
}
}
Int16 currentIndex = 0;
if (indexes.Count > 0 && indexes.Max() < Int16.MaxValue)
{
currentIndex = (Int16)indexes.Max();
ContentPresenter presenter = _target as ContentPresenter;
if (presenter != null)
{
presenter.SetValue(Canvas.ZIndexProperty, indexes.Max() + 1);
}
}
else if (indexes.Count > 0 && indexes.Max() >= Int16.MaxValue)
{
// Need to rearrange all ZIndexs!
var result = panel.Children.OrderBy(x => Canvas.GetZIndex(x));
Int16 count = 0;
foreach (UIElement element in result)
{
if (element != _target as UIElement)
{
element.SetValue(Canvas.ZIndexProperty, count);
}
count++;
}
//at the end we set the ZIndex of our element as the highest
ContentPresenter presenter = _target as ContentPresenter;
if (presenter != null)
{
presenter.SetValue(Canvas.ZIndexProperty, count);
}
}
}
// Obtain current point in the coordinate system of the reference element
Windows.UI.Input.PointerPoint currentPoint = args.GetCurrentPoint(_reference);
// Route the event to the gesture recognizer
_gestureRecognizer.ProcessDownEvent(currentPoint);
// Capture the pointer associated to this event
_target.CapturePointer(args.Pointer);
// Mark event handled, to prevent execution of default event handlers
args.Handled = true;
}