检查鼠标按下后到鼠标按下前的时间 [英] Check time after a mousebuttondown before the mousebuttonup

问题描述

我认为那应该只是一个小问题，但是我对此没有明确的想法.有人有主意吗?

I think that must be only a little problem, but I can't get a clear thought on that. Someone an idea?

我在画布上有一些边框(充满图像)，我想单击边框(我使用OnMouseLeftButtonDown进行此操作)，边框变为红色(因此用户可以确定他单击了哪个对象)，然后，在1或2秒钟后，当仍然按下鼠标按钮时，应该开始拖放操作.

I have some borders on a canvas (filled with images) and i want to click the border (i do this with the OnMouseLeftButtonDown) where the border gets red (so the user knows for sure which object he had clicked) and then, after 1 or 2 seconds, when the mousebutton is still pushed down, a drag'n'drop should start.

起初，我在按钮内部有边框，但是clickevent似乎与dragevent冲突.因此，我摆脱了按钮，直接在边框内进行了所有操作，效果也很好.但是，如何在鼠标按钮按下后开始拖动，并在时间用完之前发生鼠标按钮按下时停止拖动.

At first I had the borders inside buttons, but the clickevent seems to conflict with the dragevent. So I got rid of the buttons and did everything inside the borders directly, which works well also. But how can I start the drag after the mousebuttondown and stop it when the mousebuttonup happens before the time runs out.

有人提出清洁解决方案的想法吗?

Someone an idea for a clean solution?

推荐答案

private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    _source = sender as Border;
    Mouse.Capture(_source);
}

private void OnMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
    _source = null;
    Mouse.Capture(null);
}

并且在OnMouseMove事件中，您可以根据鼠标位置修改边框边距，但是在检查_source是否为Border类型之后.

and in event OnMouseMove you can modify border margins depends on mouse position but after checking if _source is type of Border.

var position = e.GetPosition(Canvas);

这段时间，您可以添加属性Stopwatch _watch，并且可以在OnMouseLeftButtonDown事件处理程序内部执行此操作:

For that time you can add property Stopwatch _watch, and inside OnMouseLeftButtonDown event handler you can do it:

_watch = Stopwatch.StartNew();

在OnMouseLeftButtonUp中:

in OnMouseLeftButtonUp:

_watch.Stop();

，并在代码之前的OnM​​ouseMove中:

and in OnMouseMove before your code:

while (_watch.ElapsedMilliseconds < 2000 && _watch.IsRunning)
{
    Thread.Sleep(100);
}

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