void dragElement_Moved()
{
if (mIsDrag)
{
if (mContainer != null && mDragObject != null)
{
IDragElement dragElement = mDragObject as IDragElement;
FrameworkElement frameworkElement = mDragObject as FrameworkElement;
if (dragElement != null && frameworkElement != null)
{
Point point = Mouse.GetPosition(mContainer);
MatrixTransform mt = frameworkElement.RenderTransform as MatrixTransform;
if (mt != null)
{
Matrix mx = mt.Matrix;
mx.OffsetX += point.X - mOriPosition.X;
mx.OffsetY += point.Y - mOriPosition.Y;
frameworkElement.RenderTransform = new MatrixTransform {
Matrix = mx
};
mOriPosition = point;
}
}
}
}
}
void dragElement_MoveStarted()
{
if (mContainer != null && mDragObject != null)
{
IDragElement dragElement = mDragObject as IDragElement;
FrameworkElement frameworkElement = mDragObject as FrameworkElement;
if (dragElement != null && frameworkElement != null)
{
mOriPosition = Mouse.GetPosition(mContainer);
mIsDrag = true;
}
}
}
/// <summary>
/// 初始化容器和被拖动的元素
/// </summary>
/// <typeparam name="T">被拖动元素的类型，此类必须实现IDragElement接口</typeparam>
/// <param name="container">容器</param>
/// <param name="dragObject">拖动对象</param>
public void Init <T>(IInputElement container, T dragObject) where T : FrameworkElement, IDragElement
{
mContainer = container;
mDragObject = dragObject;
IDragElement dragElement = mDragObject as IDragElement;
if (dragElement != null)
{
dragElement.MoveStarted += dragElement_MoveStarted;
dragElement.MoveStopped += dragElement_MoveStopped;
dragElement.Moved += dragElement_Moved;
}
mOrgPoint = new Point(0, 0);
mIsDrag = false;
}
public DragElement(IDragElement element, IDragElement container) : this(new [] { element }, container)
{
}
public DragElement(IEnumerable <IDragElement> elements, IDragElement container)
{
_elements = elements.ToArray();
_container = container as IContainer;
}