public void finalizeDragPreview()
{
_dragContainer.Children.Remove(_dragPreview);
_dragContainer.PreviewMouseMove -= Instance.dragSourceMouseMove;
_dragContainer.PreviewMouseUp -= Instance.dragSourceMouseUp;
_dragPreview = null;
}
public static void SetDragPreview(DependencyObject element,DragPreviewControl value)
{
element.SetValue(DragPreviewProperty,value);
}
public void dragSourceLeftButtonDown(object element,MouseButtonEventArgs e)
{
FrameworkElement dragsource = element as FrameworkElement;
_dragPreview = GetDragPreview(dragsource);
_dragContainer = (Canvas)FindAncestor(typeof(Canvas),dragsource);
_dragContainer.Children.Add(_dragPreview);
dragsource.PreviewMouseMove += Instance.dragSourceMouseMove;
_dragContainer.PreviewMouseMove += Instance.dragSourceMouseMove;
_dragContainer.PreviewMouseUp += Instance.dragSourceMouseUp;
// 按下的时候根据
}