绑定到WPF ToggleButton的IsChecked状态

Question

我想使用WPF ToggleButton来扩展和折叠我的应用程序中的一些控件.我如何使用XAML来实现这一目标？

我想,我可以在某种程度上绑定Visibility一些控件的属性到ToggleButton的IsChecked状态,但我不知道如何做到这一点.

也许我需要给我ToggleButton一个Name,然后使用绑定ElementName？然后我需要一个ValueConverter布尔值和可见性之间的转换,对吗？我怎么能ValueConverter为此目的制作通用的？

Answer 1

你需要Visibility通过转换器绑定:

<Window
  x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <Window.Resources>
    <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
  </Window.Resources>
  <StackPanel>
    <ToggleButton x:Name="toggleButton" Content="Toggle"/>
    <TextBlock
      Text="Some text"
      Visibility="{Binding IsChecked, ElementName=toggleButton, Converter={StaticResource BooleanToVisibilityConverter}}"/>
  </StackPanel>
</Window>

在Silverlight中没有,BooleanToVisibilityConverter但很容易编写自己的一些附加功能:

using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;

namespace WpfApplication1 {

  public class BooleanToVisibilityConverter : IValueConverter {

    public Object Convert(Object value, Type targetType, Object parameter, CultureInfo culture) {
      if (targetType == typeof(Visibility)) {
        var visible = System.Convert.ToBoolean(value, culture);
        if (InvertVisibility)
          visible = !visible;
        return visible ? Visibility.Visible : Visibility.Collapsed;
      }
      throw new InvalidOperationException("Converter can only convert to value of type Visibility.");
    }

    public Object ConvertBack(Object value, Type targetType, Object parameter, CultureInfo culture) {
      throw new InvalidOperationException("Converter cannot convert back.");
    }

    public Boolean InvertVisibility { get; set; }

  }

}

现在,您可以指定映射转换器true来Collapsed和false到Visible:

<BooleanToVisibilityConverter
  x:Key="InverseBooleanToVisibilityConverter" InvertVisibility="True"/>

Answer 2

使用BooleanToVisibilityConverter:

<BooleanToVisibilityConverter x:Key="bvc" />
<TextBlock Visibility="{Binding IsChecked, ElementName=toggle, Converter={StaticResource bvc}}" />