/// <summary>
/// Drag in canvas
/// </summary>
/// <param name="dragTarget">drag target</param>
/// <param name="dragElement">drag element</param>
/// <param name="bound">bound</param>
/// <returns></returns>
public static bool BindDrag(this FrameworkElement dragTarget, FrameworkElement dragElement, DragBound bound, Action <Point, bool> positonChangeCallback = null)
{
bool result = false;
if (dragTarget.Parent != null && (dragTarget.Parent as Canvas) != null)
{
Canvas moveCvs = dragTarget.Parent as Canvas;
Point positionOnElement = new Point();
bool isDrag = false;
int deviceId = 0;
DragBoundCheck check = new DragBoundCheck(dragTarget, bound);
dragElement.PreviewTouchDown += delegate(object sender, TouchEventArgs e)
{
IDrag dragObj = dragTarget as IDrag;
if (dragObj != null && dragObj.IsDrag == false)
{
return;
}
if (isDrag == false)
{
deviceId = e.TouchDevice.Id;
positionOnElement = e.GetTouchPoint(dragTarget).Position;
isDrag = true;
dragElement.CaptureTouch(e.TouchDevice);
}
};
dragElement.PreviewTouchMove += delegate(object sender, TouchEventArgs e)
{
if (isDrag && e.TouchDevice.Id == deviceId)
{
SetNewMovPosition(dragTarget, positonChangeCallback, moveCvs, positionOnElement, false, e);
}
};
dragElement.PreviewTouchUp += delegate(object sender, TouchEventArgs e)
{
if (isDrag && deviceId == e.TouchDevice.Id)
{
isDrag = false;
SetNewMovPosition(dragTarget, positonChangeCallback, moveCvs, positionOnElement, true, e);
dragElement.ReleaseTouchCapture(e.TouchDevice);
}
};
result = true;
}
return(result);
}
public DragBoundCheck(FrameworkElement element, DragBound bound)
{
this.element = element;
this.bound = bound;
}
public static bool BindDrag(this FrameworkElement dragTarget, Action <Point, bool> positonChangeCallback = null)
{
DragBound bound = new DragBound();
return(BindDrag(dragTarget, bound, positonChangeCallback));
}
