/// <summary>
/// 拖拽结束
/// </summary>
protected void DragFinished()
{
if (_adorner != null)
{
AdornerLayer.GetAdornerLayer(_source).Remove(_adorner);
}
_adorner = null;
}
/// <summary>
/// 执行拖拽操作，在进行了有效的拖拽操作时执行
/// </summary>
/// <param name="dragItem"></param>
/// <param name="adornerSource"></param>
private void DoDragDrop(object dragItem, UIElement adornerSource)
{
if (adornerSource != null) //如果选中按钮不为空
{
var rect = VisualTreeHelper.GetDescendantBounds(adornerSource); //获取拖拽节点的外边框
var size = new Size((double)Math.Ceiling(rect.Width), (double)Math.Ceiling(rect.Height)); //获取比节点大的整数值边框
var brush = new VisualBrush(adornerSource); //初始化包含节点的VisualBrush
_adorner = new DragDropAdorner(_dragScope, size, brush); //新建拖拽装饰器
_adorner.Opacity = 0.7;
_adorner.Visibility = Visibility.Hidden;
}
DragDrop.AddPreviewDragEnterHandler(_dragScope, _dragEnter);
DragDrop.AddPreviewDragOverHandler(_dragScope, _dragOver);
DragDrop.AddPreviewDragLeaveHandler(_dragScope, _dragLeave);
DragDrop.DoDragDrop(_source, dragItem, DragDropEffects.All); //执行拖拽方法，该方法会在拖拽结束后结束并返回
DragFinished(); //执行拖拽结束方法
DragDrop.RemovePreviewDragEnterHandler(_dragScope, _dragEnter);
DragDrop.RemovePreviewDragOverHandler(_dragScope, _dragOver);
DragDrop.RemovePreviewDragLeaveHandler(_dragScope, _dragLeave);
}