如何将覆盖控制置于所有其他控件之上?

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

我需要使控件出现在所有其他控件之上，所以它将部分覆盖它们。

6 个解决方案

#1

123

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

如果您在布局中使用画布或网格，请将控件置于更高的ZIndex之上。

From MSDN:

从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>

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).

如果您不指定ZIndex，则面板的子节点按指定的顺序呈现(即最后一个)。

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.

如果你想做一些更复杂的事情，你可以看看Silverlight是如何实现儿童窗口的。它覆盖了半透明的背景，并在整个RootVisual上弹出。

#2

Robert Rossney has a good solution. Here's an alternative solution I've used in the past that separates out the "Overlay" from the rest of the content. This solution takes advantage of the attached property Panel.ZIndex to place the "Overlay" on top of everything else. You can either set the Visibility of the "Overlay" in code or use a DataTrigger.

Robert Rossney有一个很好的解决方案。下面是我过去使用的另一种解决方案，它将“覆盖”与内容的其余部分区分开来。这个解决方案利用了附加的属性面板。ZIndex将“覆盖”放在其他所有东西的上面。您可以在代码中设置“覆盖”的可见性，或者使用DataTrigger。

<Grid x:Name="LayoutRoot">

 <Grid x:Name="Overlay" Panel.ZIndex="1000" Visibility="Collapsed">
    <Grid.Background>
      <SolidColorBrush Color="Black" Opacity=".5"/>
    </Grid.Background>

    <!-- Add controls as needed -->
  </Grid>

  <!-- Use whatever layout you need -->
  <ContentControl x:Name="MainContent" />

</Grid>

#3

Controls in the same cell of a Grid are rendered back-to-front. So a simple way to put one control on top of another is to put it in the same cell.

网格中的同一单元格的控件被呈现为前后颠倒。一个简单的方法是将一个控件放在另一个控件上，放在同一个单元格中。

Here's a useful example, which pops up a panel that disables everything in the view (i.e. the user control) with a busy message while a long-running task is executed (i.e. while the BusyMessage bound property isn't null):

这里有一个很有用的例子，它会弹出一个面板，在执行一个长时间运行的任务时(也就是说，当BusyMessage绑定属性不是空的时候)，在视图(即用户控件)中禁用所有的内容(也就是说，当一个长时间运行的任务被执行时):

<Grid>

    <local:MyUserControl DataContext="{Binding}"/>

    <Grid>
        <Grid.Style>
            <Style TargetType="Grid">
                <Setter Property="Visibility"
                        Value="Visible" />
                <Style.Triggers>
                    <DataTrigger Binding="{Binding BusyMessage}"
                                 Value="{x:Null}">
                        <Setter Property="Visibility"
                                Value="Collapsed" />
                    </DataTrigger>

                </Style.Triggers>
            </Style>
        </Grid.Style>
        <Border HorizontalAlignment="Stretch"
                VerticalAlignment="Stretch"
                Background="DarkGray"
                Opacity=".7" />
        <Border HorizontalAlignment="Center"
                VerticalAlignment="Center"
                Background="White"
                Padding="20"
                BorderBrush="Orange"
                BorderThickness="4">
            <TextBlock Text="{Binding BusyMessage}" />
        </Border>
    </Grid>
</Grid>

#4

Put the control you want to bring to front at the end of your xaml code. I.e.

将您想要在xaml代码末尾的控件放在前面。即。

<Grid>
  <TabControl ...>
  </TabControl>
  <Button Content="ALways on top of TabControl Button"/>
</Grid>

#5

This is a common function of Adorners in WPF. Adorners typically appear above all other controls, but the other answers that mention z-order may fit your case better.

这是在WPF中装饰的常用功能。Adorners通常会出现在所有其他控件之上，但是其他的答案会更适合你的情况。

#6

<Canvas Panel.ZIndex="1" HorizontalAlignment="Left" VerticalAlignment="Top" Width="570">
  <!-- YOUR XAML CODE -->
</Canvas>

#1

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