.net 如何为 WPF 元素提供矩形平面 3D 边框？
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How can I give a WPF element a rectangular flat 3D border?
提问by Drew Noakes
I would like to create a rectangular 'flat 3D' look for one of my control templates. In it's most simple version this means having a line at the bottom that is darker than that at the top, and maybe some variation between the left and right lines too.
我想为我的一个控件模板创建一个矩形的“平面 3D”外观。在最简单的版本中，这意味着底部的线条比顶部的线条更暗，并且左右线条之间可能也有一些变化。
A more complex version would allow me to provide on or more brushes so that gradients could be applied.
更复杂的版本将允许我提供一个或多个画笔，以便可以应用渐变。
The default <Border>element in WPF lets you specify a different thickness per edge, but I can't find a way to specify multiple brushes.
<Border>WPF 中的默认元素允许您为每条边指定不同的厚度，但我找不到指定多个画笔的方法。
So, how can I produce the effect I want as simply as possible?
那么，我怎样才能尽可能简单地产生我想要的效果呢？
EDITit's been suggested that I post an example of how I want to use this. Personally I'd be happy to have a style or a user control. The user control might be used thus:
编辑有人建议我发布一个我想如何使用它的例子。就我个人而言，我很乐意拥有一种样式或用户控件。用户控件可以这样使用：
<FourSidedBorder LeftSideBrush="#00f" RightSideBrush="#0f0" ... />
Or perhaps even simpler:
或者甚至更简单：
<FourSidedBorder BorderBrush="#00f,#0f0,#f00,#fff"
BorderThickness="1,2,3,4" ... />
These are just ideas. Any sensible, concise solution is welcome.
这些只是想法。欢迎任何明智、简洁的解决方案。
回答by Drew Noakes
Here is a solution I devised that achieves most of what I want. It doesn't give complete control over all four sides independently, but it does give the rectangular flat 3D view that I want.
这是我设计的一个解决方案，可以实现我想要的大部分内容。它不能独立地完全控制所有四个边，但它确实提供了我想要的矩形平面 3D 视图。
Here's how it looks:
这是它的外观：
Paste this into Kaxamlto see it for yourself:
将其粘贴到Kaxaml 中以亲自查看：
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Background="#CCC">
<Page.Resources>
<!-- A brush for flat 3D panel borders -->
<LinearGradientBrush x:Key="Flat3DBorderBrush"
StartPoint="0.499,0" EndPoint="0.501,1">
<GradientStop Color="#FFF" Offset="0" />
<GradientStop Color="#DDD" Offset="0.01" />
<GradientStop Color="#AAA" Offset="0.99" />
<GradientStop Color="#888" Offset="1" />
</LinearGradientBrush>
</Page.Resources>
<Grid>
<!-- A flat 3D panel -->
<Border
HorizontalAlignment="Center" VerticalAlignment="Center"
BorderBrush="{StaticResource Flat3DBorderBrush}"
BorderThickness="1" Background="#BBB">
<!-- some content here -->
<Control Width="100" Height="100"/>
</Border>
</Grid>
</Page>
Hope that helps someone else out. I'm still on the lookout for innovative solutions to this problem, so keep posting and I'll accept a better answer than this one.
希望能帮助别人。我仍在寻找解决此问题的创新解决方案，因此请继续发帖，我会接受比这个更好的答案。
回答by Greg D
I've done something like this just by placing multiple borders directly on top of one another. E.g.:
我只是通过将多个边框直接放在另一个边框上来完成类似的操作。例如：
<Border
x:Name="TopAndLeft"
BorderThickness="3,3,0,0"
BorderBrush="{x:Static SystemColors.ControlLightBrush}">
<Border
x:Name="BottomAndRight"
BorderThickness="0,0,3,3"
BorderBrush="{x:Static SystemColors.ControlDarkBrush}">
<ContentPresenter ... />
</Border>
</Border>
This provides the added advantage of all the other features that border provides-- corner radius and such.
这提供了边框提供的所有其他功能的附加优势 - 角半径等。
回答by Micah
Honestly probably the easiest way would be to use layering techniques. For instance create a grid like this:
老实说，最简单的方法可能是使用分层技术。例如创建一个像这样的网格：
<Grid Width="50" Height="50">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<!-- Top Border -->
<Border Height="3" Background="LightGray" Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" />
<!-- Right Border -->
<Border Width="3" Background="DarkGray" Grid.Column="2" Grid.Row="0" Grid.RowSpan="3" />
<!-- Content -->
<Border Background="Gray" Grid.Row="1" Grid.Column="1" />
<!-- Left Border -->
<Border Width="3" Background="LightGray" Grid.Row="1" Grid.Column="0" Grid.RowSpan="2" />
<!-- Bottom Border -->
<Border Height="3" Background="DarkGray" Grid.Row="2" Grid.Column="1" />
</Grid>
I think you get the idea. This is probably the easiest way of doing it. You could set this up as a template and use it like this:
我想你应该已经明白了。这可能是最简单的方法。您可以将其设置为模板并像这样使用它：
<Template x:Key="My3DBorder" TargetType="ContentControl">
<!-- Put the Grid definition in here from above -->
</Template>
<ContentControl Template="{StaticResource My3dBorder}">
<!-- My Content Goes Here -->
</ContentControl>
回答by Glen
you can reference the PresentationFramework.Classicassembly and then use
您可以参考PresentationFramework.Classic程序集，然后使用
<Window xmlns:mwt="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Classic">
...
<Grid Width="50" Height="50">
<mwt:ClassicBorderDecorator BorderThickness="3,3,3,3"/>
</Grid>
I was using this technique for looking at control templatesto see how default buttons were styled
我正在使用这种技术来查看控件模板以查看默认按钮的样式
回答by LuckyLuke82
My two cents for cool approach that I prefer - using shadows too (as a style, so you can use It anywhere):
我更喜欢的酷方法的两美分 - 也使用阴影（作为一种样式，因此您可以在任何地方使用它）：
<Style x:Key="border_style" TargetType="{x:Type Border}">
<Style.Resources>
<DropShadowEffect x:Key="dropShadowEffect" BlurRadius="8" ShadowDepth="1" Color="#FF2686AA" RenderingBias="Quality"/>
</Style.Resources>
<Setter Property="CornerRadius" Value="2" />
<Setter Property="Effect" Value="{StaticResource dropShadowEffect}"/>
<Setter Property="BorderBrush" Value="Gray"/>
<Setter Property="BorderThickness" Value="1.2,1.2,0.3,0.3"/>
</Style>
Usage (when you register your styles):
用法（当您注册样式时）：
<Border Style="{StaticResource border_style}">
</Border>
Position of 3D border effect Is done with BorderThickness. And you can play with colors, ShadowDepth,BlurRadius, CornerRadius etc.
3D 边框效果的位置由 BorderThickness 完成。您可以使用颜色、ShadowDepth、BlurRadius、CornerRadius 等。
回答by Astrogator
Needed a classic 3D 'inset' border. Based on @GregD's answer (thank you!):
需要一个经典的 3D '插图' 边框。基于@GregD 的回答（谢谢！）：
<Border BorderThickness="0,0,1,1" BorderBrush="{x:Static SystemColors.ControlLightLightBrush}">
<Border BorderThickness="1,1,0,0" BorderBrush="{x:Static SystemColors.ControlDarkBrush}">
<Border BorderThickness="0,0,1,1" BorderBrush="{x:Static SystemColors.ControlLightBrush}">
<Border BorderThickness="1,1,0,0" BorderBrush="{x:Static SystemColors.ControlDarkDarkBrush}">
..
</Border>
</Border>
</Border>
</Border>
To make it an 'outset', revert the order of 1st and 2nd element pairs.
要使其成为“开始”，请反转第 1 和第 2 元素对的顺序。
