为 WPF 复选框的不确定状态设置样式

问题描述

我想为 WPF 复选框的不确定状态设置样式.我们有一个带有复选框的树视图控件，我们希望不确定状态表示某些后代已选中，有些未选中.

I want to style the indeterminate state of a WPF checkbox. We have a treeview control with checkboxes, and we want the indeterminate state to represent that some descendants are checked and some are unchecked.

我到处都看到的解决方案是覆盖复选框的默认控件模板并执行我需要执行的操作.

The solution I'm seeing everywhere is to override the default control template for a checkbox and do what I need to do.

我有两个问题:

1. 我找不到控件模板对于普通的 Aero 复选框.这个一:http://msdn.microsoft.com/en-us/library/ms752319.aspx看起来很傻.

我从 Expression Blend 获得的控件模板中包含 BulletChrome 元素，我不知道如何处理它.

The control template I get from Expression Blend has that BulletChrome element in it, and I can't figure out what to do with that.

那么有谁知道从哪里获得看起来正常"的复选框控件模板，或者有没有更简单的方法来单独设置不确定状态的样式?

So does anyone know where to get a checkbox control template that looks "normal" or is there an easier way to just style the indeterminate state by itself?

我确定有一个简单的方法我只是俯瞰......对吗?

I'm sure there's an easy way I'm just overlooking... Right?

推荐答案

试试这个(从publicgk链接的文章修改)

Try this (modified from the article that publicgk linked to)

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:theme="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero" Title="MainWindow" Height="350" Width="525">
  <Window.Resources>
    <Style x:Key="CheckRadioFocusVisual">
      <Setter Property="Control.Template">
        <Setter.Value>
          <ControlTemplate>
            <Rectangle Margin="14,0,0,0"
                       StrokeThickness="1"
                       Stroke="Black"
                       StrokeDashArray="1 2"
                       SnapsToDevicePixels="true"/>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>

    <Style x:Key="EmptyCheckBoxFocusVisual">
      <Setter Property="Control.Template">
        <Setter.Value>
          <ControlTemplate>
            <Rectangle Margin="1"
                       StrokeThickness="1"
                       Stroke="Black"
                       StrokeDashArray="1 2"
                       SnapsToDevicePixels="true"/>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>

    <SolidColorBrush x:Key="CheckBoxFillNormal"
                     Color="#F4F4F4"/>
    <SolidColorBrush x:Key="CheckBoxStroke"
                     Color="#8E8F8F"/>
    <Style x:Key="{x:Type CheckBox}"
         TargetType="{x:Type CheckBox}">
      <Setter Property="Foreground"
            Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
      <Setter Property="Background"
            Value="{StaticResource CheckBoxFillNormal}"/>
      <Setter Property="BorderBrush"
            Value="{StaticResource CheckBoxStroke}"/>
      <Setter Property="BorderThickness"
            Value="1"/>
      <Setter Property="FocusVisualStyle"
            Value="{StaticResource EmptyCheckBoxFocusVisual}"/>
      <Setter Property="Template">
        <Setter.Value>
          <ControlTemplate TargetType="{x:Type CheckBox}">
            <BulletDecorator Background="Transparent"
                             SnapsToDevicePixels="true">
              <BulletDecorator.Bullet>
                <theme:BulletChrome Background="{TemplateBinding Background}"
                                    BorderBrush="{TemplateBinding BorderBrush}"
                                    RenderMouseOver="{TemplateBinding IsMouseOver}"
                                    RenderPressed="{TemplateBinding IsPressed}"
                                    IsChecked="{TemplateBinding IsChecked}"/>
              </BulletDecorator.Bullet>
              <ContentPresenter Margin="{TemplateBinding Padding}"
                                VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                RecognizesAccessKey="True"
                                SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
            </BulletDecorator>
            <ControlTemplate.Triggers>
              <Trigger Property="IsChecked"
                       Value="{x:Null}">
                <!-- TODO: Do Stuff Here -->
              </Trigger>
              <Trigger Property="HasContent"
                       Value="true">
                <Setter Property="FocusVisualStyle"
                        Value="{StaticResource CheckRadioFocusVisual}"/>
                <Setter Property="Padding"
                        Value="4,0,0,0"/>
              </Trigger>
              <Trigger Property="IsEnabled"
                       Value="false">
                <Setter Property="Foreground"
                        Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
              </Trigger>
            </ControlTemplate.Triggers>
          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>
  </Window.Resources>
  <StackPanel>
    <CheckBox IsChecked="True" Content="Checked"/>
    <CheckBox IsChecked="{x:Null}" Content="Unknown"/>
    <CheckBox IsChecked="False" Content="Not Checked"/>
  </StackPanel>
</Window>

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