是否可以在WPF ItemsControl中模拟边框折叠(ala CSS)? [英] Is it possible to emulate border-collapse (ala CSS) in a WPF ItemsControl?
问题描述
我正在WPF ListBox
中对项目进行样式设置,并希望在每个项目周围添加边框.例如,在BorderThickness
设置为1的情况下,相邻项目之间的上下边框都被绘制,因此比侧边框显得更厚",如图所示:
I'm styling the items in a WPF ListBox
, and want to put a border around each item. With BorderThickness
set to 1, for example, the top-bottom borders between adjacent items are both drawn and therefore appear "thicker" than the side borders, as shown:
产生这些ListBoxItems
的项目模板是:
The item template that produces these ListBoxItems
is:
<DataTemplate>
<Border BorderThickness="1" BorderBrush="DarkSlateGray" Background="DimGray" Padding="8 4 8 4">
<TextBlock Text="{Binding Name}" FontSize="16"/>
</Border>
</DataTemplate>
我想折叠"这些相邻的边界,例如,通过CSS .我知道BorderThickness
可以为左/右/上/下边框分别定义,但是这也会影响第一个或最后一个项目的边框,这是不希望的.
I'd like to "collapse" these adjacent borders, as one could, for example, through CSS. I'm aware that BorderThickness
can be defined separately for the left/right/top/bottom borders, but this affects the border of the first or last item, as well, which is not desired.
有没有一种方法可以使用WPF做到这一点?我缺少的Border
属性,还是需要使用其他方法来创建边框?
Is there a way to accomplish this with WPF? A property of Border
I'm missing, or does it require a different approach to creating borders?
推荐答案
使用BorderThickness="1,0,1,1"
和DataTrigger
来检查RelativeSource={RelativeSource Mode=PreviousData}
是否为null
来设置BorderThickness="1,1,1,1"
:
Use BorderThickness="1,0,1,1"
and a DataTrigger
which checks for RelativeSource={RelativeSource Mode=PreviousData}
being null
to set BorderThickness="1,1,1,1"
:
<Window x:Class="CollapseBordersDemo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
Title="MainWindow" Height="239" Width="525">
<Window.Resources>
<x:Array x:Key="ListBoxItems" Type="{x:Type sys:String}">
<sys:String>Alice</sys:String>
<sys:String>Bob</sys:String>
<sys:String>Colleen</sys:String>
</x:Array>
<DataTemplate x:Key="ListBoxTemplate">
<Border x:Name="Border" BorderThickness="1,0,1,1" BorderBrush="DarkSlateGray" Background="LightGray" Padding="8 4 8 4">
<TextBlock Text="{Binding}" FontSize="16"/>
</Border>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=PreviousData}}" Value="{x:Null}">
<Setter TargetName="Border" Property="BorderThickness" Value="1,1,1,1"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</Window.Resources>
<Grid>
<ListBox ItemsSource="{StaticResource ListBoxItems}" ItemTemplate="{StaticResource ListBoxTemplate}" HorizontalContentAlignment="Stretch" />
</Grid>
</Window>
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