private static void OnFixedDragChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
TreeViewDragDropTarget tree = (TreeViewDragDropTarget)obj;
//监听开始拖动事件，如果鼠标按下，才真正拖动
tree.ItemDragStarting += (o, e) =>
{
if (!GetIsButtonDown(tree))
{
e.Cancel = true;
e.Handled = true;
}
};
//在鼠标按下及松开时，管理鼠标是否按下状态
tree.AddHandler(TreeView.MouseLeftButtonDownEvent,
new MouseButtonEventHandler((o, e) =>
{
SetIsButtonDown(tree, true);
}), true);
tree.AddHandler(TreeView.MouseLeftButtonUpEvent,
new MouseButtonEventHandler((o, e) =>
{
SetIsButtonDown(tree, false);
}), true);
}
public static void SetFixedDrag(TreeViewDragDropTarget ui, bool value)
{
ui.SetValue(FixedDragProperty, value);
}
public static void SetFixedDrag(TreeViewDragDropTarget ui, bool value)
{
ui.SetValue(FixedDragProperty, value);
}
public static bool GetFixedDrag(TreeViewDragDropTarget ui)
{
return((bool)ui.GetValue(FixedDragProperty));
}
public static bool GetFixedDrag(TreeViewDragDropTarget ui)
{
return (bool)ui.GetValue(FixedDragProperty);
}
