WPF 弹出窗口：如何在弹出窗口周围放置边框？
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WPF Popup: How to put a border around the popup?
提问by Shafique
I've got a Popupin my XAML to show some information. When the box pops up, it has no Borderand appears to blend into the Backgroundof the page. It just needs a Border, and ideally a drop-shadow behind it to show some sort of layering and focus.
Popup我的 XAML 中有一个用于显示一些信息。当该框弹出时，它没有Border并且似乎融入Background了页面的 。它只需要一个Border，最好在它后面有一个阴影来显示某种层次和焦点。
Any ideas how to style a Popup to have a border and possibly the shadow-effect?
任何想法如何设置弹出窗口的样式以具有边框和可能的阴影效果？
采纳答案by Shafique
Thanks, I ended up giving it a 3D-like (hardly) appearance by setting the border like:
谢谢，我最终通过将边框设置为类似 3D（几乎）的外观：
<Border BorderBrush="White" BorderThickness="3,3,0,0">
<Border BorderBrush="Black" BorderThickness="1,1,3,3">
</Border>
</Border>
Looks pretty decent!
看起来相当不错！
回答by bochja
Much easier in my opinion is putting a margin around the Popup Border large enough for the DropShadowEffect, i.e.
在我看来，在 Popup Border 周围放置足够大的边距对于 DropShadowEffect 来说要容易得多，即
<Border ... Margin="0 0 8 8">
<Border.Effect>
<DropShadowEffect ... />
</Border.Effect>
<!-- Popup Content Here -->
</Border>
The Popup should allow transparency, that is AllowsTransparency = True.
Popup 应该允许透明，即 AllowsTransparency = True。
回答by Randolpho
<Popup PopupAttributes="SetByYou">
<Border BorderAttribute="SetByYou">
<!-- Content here -->
</Border>
</Popup>
回答by HAdes
Apparently popups don't currently support drop shadows, see link.
显然，弹出窗口目前不支持阴影，请参阅链接。
However, I have come up with a workaround this which works rather well IMO. Basically the idea is to have a Canvas nested within another transparent Canvas and just apply the drop shadow to the nested Canvas. Simple. Heres an example:
但是，我提出了一种解决方法，该方法在 IMO 中效果很好。基本上这个想法是将一个 Canvas 嵌套在另一个透明的 Canvas 中，然后将阴影应用于嵌套的 Canvas。简单的。这是一个例子：
<Grid>
<TextBox x:Name="MyTxtBx" Width="50"
Height="20" Text="Hello"/>
<Popup IsOpen="True" Width="200" Height="100"
PlacementTarget="{Binding ElementName=MyTxtBx}"
AllowsTransparency="True" >
<Canvas Background="Transparent">
<Canvas Background="Green" Width="150" Height="50">
<Canvas.BitmapEffect>
<DropShadowBitmapEffect Softness=".5"
ShadowDepth="5"
Color="Black"/>
</Canvas.BitmapEffect>
<Label Content="THIS IS A POPUP TEST"/>
</Canvas>
</Canvas>
</Popup>
</Grid>
The points to note are that the nested canvas needs to be smaller than the size of it's container. Also AllowsTransparency must be set too.
需要注意的一点是嵌套画布需要小于其容器的大小。还必须设置 AllowsTransparency。
