WPF:画布鼠标事件不会在空白区域触发 [英] WPF: Canvas mouse events not firing on empty space

问题描述

我在 Canvas 上设置了鼠标事件，如下所示:

I have set mouse events on a Canvas as follows:

<Canvas MouseUp="CanvasUp" MouseDown="CanvasDown" MouseMove="CanvasMove">
...
</Canvas>

但这些仅在 Image 和 Rectangle 等子元素上有效，而不在空白处有效.我该如何解决这个问题?

But these are active only on the child elements like Image and Rectangle, not on the empty space. How can I solve this?

推荐答案

没有设置背景颜色(显式或通过样式等)的控件将默认具有 null 背景颜色 - 使其不可命中测试.

A control with no background color set (explicitly or through styles etc) will default to having a background color of null - making it not hit-testable.

如果您将背景设置为透明"(或除 null ({x:Null}) 以外的任何内容)，那么它将能够拾取鼠标事件

If you set the background to "Transparent" (or anything other than null ({x:Null})) then it will be able to pick up the mouse events

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