将自定义依赖属性绑定到自定义WPF样式

Question

设计继承的扩展器时遇到问题。我的意图是在切换按钮后面有一个进度条，并在默认的扩展器头文件中有文本。

我有这个XAML代码，它给了我头部的进度条。这是一种自定义风格。

<Style x:Key="CurrentScanExpanderStyle" TargetType="{x:Type local:ProgressExpander}"> 
     <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/> 
     <Setter Property="Background" Value="Transparent"/> 
     <Setter Property="HorizontalContentAlignment" Value="Stretch"/> 
     <Setter Property="VerticalContentAlignment" Value="Stretch"/> 
     <Setter Property="BorderBrush" Value="Transparent"/> 
     <Setter Property="BorderThickness" Value="1"/> 
     <Setter Property="Template"> 
      <Setter.Value> 
       <ControlTemplate TargetType="{x:Type local:ProgressExpander}"> 
        <Border SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="3"> 
         <DockPanel> 
          <Grid DockPanel.Dock="Top"> 
           <Grid.ColumnDefinitions> 
            <ColumnDefinition Width="*"/> 
           </Grid.ColumnDefinitions> 
           <ProgressBar Name="ProgressBar"/> 
           <ToggleButton FontFamily="{TemplateBinding FontFamily}" FontSize="{TemplateBinding FontSize}" FontStretch="{TemplateBinding FontStretch}" FontStyle="{TemplateBinding FontStyle}" FontWeight="{TemplateBinding FontWeight}" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" FocusVisualStyle="{StaticResource ExpanderHeaderFocusVisual}" Margin="1" MinHeight="0" MinWidth="0" x:Name="HeaderSite" Style="{StaticResource ExpanderDownHeaderStyle}" IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Content="{TemplateBinding Header}" ContentTemplate="{TemplateBinding HeaderTemplate}" ContentTemplateSelector="{TemplateBinding HeaderTemplateSelector}"/> 
          </Grid> 
          <ContentPresenter Focusable="false" Visibility="Collapsed" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" x:Name="ExpandSite" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" DockPanel.Dock="Bottom"/> 
         </DockPanel> 
        </Border> 
        <ControlTemplate.Triggers> 
         <!-- Triggers haven't changed from the default --> 
        </ControlTemplate.Triggers> 
       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 
    </Style> 

这工作正常，但我有麻烦约束我的自定义依赖项属性，它控制进度百分比。

public class ProgressExpander : Expander 
{ 
    static ProgressExpander() 
    { 
     DefaultStyleKeyProperty.OverrideMetadata(typeof(ProgressExpander), new FrameworkPropertyMetadata(typeof(ProgressExpander))); 
    }  



    public int Progress 
    { 
     get { return (int)GetValue(ProgressProperty); } 
     set { SetValue(ProgressProperty, value); } 
    } 

    // Using a DependencyProperty as the backing store for Progress. This enables animation, styling, binding, etc... 
    public static readonly DependencyProperty ProgressProperty = 
     DependencyProperty.Register("Progress", typeof(int), typeof(ProgressExpander), new UIPropertyMetadata(0)); 


} 

这是窗口中的代码：

  <local:ProgressExpander Grid.Row="1" Header="Current Scan" ExpandDirection="Down" x:Name="currentScanExpander" Style="{DynamicResource CurrentScanExpanderStyle}"> 
       <Canvas Background="SkyBlue" 
         Name="currentScanCanvas" 
         Height="{Binding ElementName=currentScanExpander, Path=ActualWidth}" 
         /> 
      </local:ProgressExpander> 

我不知道如何绑定这个依赖属性进度的样式内的进度的进度值。

任何帮助，将不胜感激。

Answer 1

在样式中，我们可以使用带有RelativeSource的标准绑定来设置属性。

<ProgressBar Name="ProgressBar" 
      Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Progress}" 
      Minimum="0" 
      Maximum="100" /> 

然后，在窗口中，我们只需添加进展=“50”或结合到别的地方。

您还需要将Button的背景设置为透明，或者更改布局的某种方式才能看到它。