WPF拖动距离阈值 [英] WPF drag distance threshold

问题描述

我有一个带有两个WPF树视图的程序，允许在两个WPF树视图之间进行拖放。问题是，打开/关闭树视图上的项目可能很烦人，因为在按住鼠标左键的同时仅移动鼠标一个像素会触发拖放功能。有什么方法可以指定鼠标在被拖放之前应该移动多远？

I have a program with two WPF treeviews that allow dragging and dropping between the two. The problem is, it can be annoying to open / close items on the treeviews because moving the mouse just one pixel while holding the left mouse button triggers the drag / drop functionality. Is there some way to specify how far the mouse should move before it's considered a drag / drop?

推荐答案

有一个系统参数这个。如果您有

There's a system parameter for this. If you have

Point down = {where mouse down event happened}
Point current = {position in the MouseMove eventargs}

然后，如果

Math.Abs(current.X - down.X) >= SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(current.Y - down.Y) >= SystemParameters.MinimumVerticalDragDistance)

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