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/// <summary>
/// 记录开始拖动时的坐标
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void treeview_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_lastMouseDown = e.GetPosition(treeview);
}
private void treeview_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
Point currentPosition = e.GetPosition(treeview); //实时坐标
if ((Math.Abs(currentPosition.X - _lastMouseDown.X) > 2.0) || (Math.Abs(currentPosition.Y - _lastMouseDown.Y) > 2.0)) //当节点拖动时的坐标(x/y)大于原坐标(x/y)2.0的距离
{
if ((treeview.SelectedItem as TreeViewItem) != null)
{
//执行拖拽效果
DragDrop.DoDragDrop((treeview.SelectedItem as TreeViewItem), sender, DragDropEffects.Move);
}
}
}
}
/// <summary>
/// 检查目标节点合法性
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void treeview_CheckDropTarget(object sender, DragEventArgs e)
{
if(自己处理条件)
{
e.Effects = DragDropEffects.Move; //满足条件
}
else
{
e.Effects = DragDropEffects.None; //不满足条件
}
}
e.Handled = true;
}
/// <summary>
/// 把源节点保存到目标下
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void treeview_Drop(object sender, DragEventArgs e)
{
if (e.Source as Canvas!= null)
{
//具体代码自己改, 这里是保存拖动的数据
Canvas.Children.Add(treeview.SelectItem);
}
}