/// <summary>
/// Captures the specified device to this element.
/// </summary>
/// <param name="touchDevice">The touch device to capture.</param>
/// <returns>True if capture was taken.</returns>
public bool CaptureTouch(TouchDevice touchDevice)
{
if (touchDevice == null)
{
throw new ArgumentNullException("touchDevice");
}
return(touchDevice.Capture(this));
}
public static void CaptureTouchDeviceToManipulationEnabledParent(DependencyObject element, TouchDevice touchDevice)
{
if (element == null)
{
return;
}
UIElement parent = VisualTreeHelper.GetParent(element) as UIElement;
if (parent == null)
{
touchDevice.Capture(null);
return;
}
if (parent.IsManipulationEnabled)
{
touchDevice.Capture(parent as IInputElement);
return;
}
CaptureTouchDeviceToManipulationEnabledParent(parent, touchDevice);
}
protected virtual bool BeginDragOperation(InputDevice deviceToCapture, Point initialDragPosition)
{
// This is a helper method that provides for easy dragging of the
// LoopPanel's Offset using the Mouse. It can be overridden to provide
// support for other input devices like a Surface Contact.
bool result = false;
if (CapturedDevice == null)
{
_lastDragPosition = initialDragPosition;
if (deviceToCapture is MouseDevice)
{
MouseDevice md = deviceToCapture as MouseDevice;
if (md.Captured != null)
{
md.Captured.ReleaseMouseCapture();
}
// By default, we support dragging via the left mouse button.
// If another button is required for dragging, this method should be overridden.
if (md.Captured == null && md.LeftButton == MouseButtonState.Pressed)
{
CapturedDevice = md;
md.Capture(this);
result = true;
}
}
else if (deviceToCapture is TouchDevice)
{
TouchDevice td = deviceToCapture as TouchDevice;
if (td.Captured != null)
{
this.ReleaseTouchCapture(td);
}
// By default, we support dragging via the left touch button.
// If another button is required for dragging, this method should be overridden.
if (td.Captured == null)
{
CapturedDevice = td;
td.Capture(this);
result = true;
}
}
}
return(result);
}
/// <summary>
/// Releases capture from the specified touch device.
/// </summary>
/// <param name="touchDevice">The device that is captured to this element.</param>
/// <returns>true if capture was released, false otherwise.</returns>
public bool ReleaseTouchCapture(TouchDevice touchDevice)
{
if (touchDevice == null)
{
throw new ArgumentNullException("touchDevice");
}
if (touchDevice.Captured == this)
{
touchDevice.Capture(null);
return(true);
}
else
{
return(false);
}
}
