为什么此 WPF 代码不生成上下文菜单？
也许我正在经历一个后鲍尔默巅峰时刻。 我希望有人能帮助我指出显而易见的事情。
为什么此代码在右键单击时生成上下文菜单：
<Canvas Background="Transparent">
<Canvas.ContextMenu>
<ContextMenu>
<TextBlock>WTF?</TextBlock>
</ContextMenu>
</Canvas.ContextMenu>
</Canvas>
并且此代码不生成上下文菜单：
<Canvas>
<Canvas.ContextMenu>
<ContextMenu>
<TextBlock>WTF?</TextBlock>
</ContextMenu>
</Canvas.ContextMenu>
</Canvas>
Perhaps I'm having a Post-Ballmer-Peak Moment.
I'm hoping that someone can help point out the obvious to me.
Why does this code generate a context menu on right click:
<Canvas Background="Transparent">
<Canvas.ContextMenu>
<ContextMenu>
<TextBlock>WTF?</TextBlock>
</ContextMenu>
</Canvas.ContextMenu>
</Canvas>
And this code doesn't generate a context menu:
<Canvas>
<Canvas.ContextMenu>
<ContextMenu>
<TextBlock>WTF?</TextBlock>
</ContextMenu>
</Canvas.ContextMenu>
</Canvas>
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这是因为
Transparent画笔允许某个区域可点击，从而接收并响应鼠标点击，而默认的null画笔则不允许。 换句话说，如果没有定义任何画笔，该区域会变成“空心”并且点击会通过； 如果定义了画笔（即使是透明的），它们是“实心”的并且可以接收点击声。请参阅有关 WPF 画笔的有用文章更多信息。
It's because the
Transparentbrush allows an area to be hittable and thus receive and respond to mouse clicks, whereas the defaultnullbrush doesn't. In other words, without any brush defined, the region becomes "hollow" and clicks pass through; with a brush defined (even a transparent one), they are "solid" and clicks can be received.See this helpful article on WPF brushes for more info.