如何使覆盖控件高于所有其他控件? [英] How to make overlay control above all other controls?

问题描述

我需要让一个控件出现在所有其他控件之上，这样它就会部分覆盖它们.

I need to make a control appear above all other controls, so it will partially overlay them.

推荐答案

如果您在布局中使用 Canvas 或 Grid，请提供要放置的控件顶一个更高的ZIndex.

If you are using a Canvas or Grid in your layout, give the control to be put on top a higher ZIndex.

来自 MSDN:

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" WindowTitle="ZIndex Sample">
  <Canvas>
    <Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="100" Canvas.Left="100" Fill="blue"/>
    <Rectangle Canvas.ZIndex="1" Width="100" Height="100" Canvas.Top="150" Canvas.Left="150" Fill="yellow"/>
    <Rectangle Canvas.ZIndex="2" Width="100" Height="100" Canvas.Top="200" Canvas.Left="200" Fill="green"/>

    <!-- Reverse the order to illustrate z-index property -->

    <Rectangle Canvas.ZIndex="1" Width="100" Height="100" Canvas.Top="300" Canvas.Left="200" Fill="green"/>
    <Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="350" Canvas.Left="150" Fill="yellow"/>
    <Rectangle Canvas.ZIndex="2" Width="100" Height="100" Canvas.Top="400" Canvas.Left="100" Fill="blue"/>
  </Canvas>
</Page>

如果您不指定 ZIndex，面板的子项将按照指定的顺序呈现(即最后一个在顶部).

If you don't specify ZIndex, the children of a panel are rendered in the order they are specified (i.e. last one on top).

如果您想要做一些更复杂的事情，您可以查看 ChildWindow 在 Silverlight 中是如何实现的.它覆盖了整个 RootVisual 的半透明背景和弹出窗口.

If you are looking to do something more complicated, you can look at how ChildWindow is implemented in Silverlight. It overlays a semitransparent background and popup over your entire RootVisual.

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