设置整个窗口的前景色 [英] Setting Foreground Color of Entire Window

问题描述

我想前景（文本）颜色设置为我所有的元素$ B $的b。您会认为这将是容易的，但它不是...

I'd like to set the foreground (text) color to all of my elements You'd think this would be easy, but it's not...

<Window Foreground="Red">
   <Label Content="Test"/>
   <Label Content="Test"/>
   <CheckBox Content="Checkbox"/>
</Window>

这没有任何效果...我能得到这个工作的唯一方法是，如果我设置关于具体的要素中的每一个前景属性。如果你有上百个元素，等这很烦人的。

This has no effect... The only way I can get this to work is if I set the Foreground property on each one of the elements specifically. And this gets annoying if you have hundreds of elements, etc.

也许你认识的一种方式？

Maybe you know of a way?

推荐答案

这是因为随着标签这样的控件和复选框覆盖<$ C在他们的风格$ C>前景属性。

This is because such controls as Label and CheckBox override the Foreground property in their styles.

下面是一个例子元素，显示了典型的逻辑树怎么就窗口级别指定的值向下传播树：

Below is an example a typical logical tree of elements that shows how the value specified on the Window level travels down the tree:

Window (Red [Local]) 
  -> Grid (Red [Inherited]) 
     -> ListBox (Red [Inherited]) 
        -> ListBoxItem (Red [Inherited]) 
           -> StackPanel (Red [Inherited]) 
              -> Label (Black [Style])
                 -> TextBlock (Black [Inherited])
              -> TextBlock (Red [Inherited])

的在方括号内的值的来源所示。 的

正如你所看到的标签继承休息本身，因为它具有前景属性在其默认样式设置：

As you can see the inheritance breaks on the Label itself because it has the Foreground property set in its default style:

<Style x:Key="{x:Type Label}"
       TargetType="{x:Type Label}">
    <Setter Property="Foreground"
            Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
    ...
</Style>

作为一种解决方法，我们可以使用下面的技巧。定义这样的控件的默认样式（如标签）的应用程序（在App.xaml中或在窗口 inself ）。而在默认样式覆盖前景属性来设置相对源绑定到仍然有期望值的控制的最近的祖先：

As a workaround for this we can use the following trick. Define the default style for such controls (as Label) in the application (in App.xaml or in the Window inself). And in that default style override the Foreground property to set a relative source binding to the nearest ancestor of the control that still has the desired value:

<Style TargetType="{x:Type Label}">
    <Setter Property="Foreground"
            Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type FrameworkElement}}, Path=(TextElement.Foreground)}"/>
</Style>

<Style TargetType="{x:Type CheckBox}">
    <Setter Property="Foreground"
            Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type FrameworkElement}}, Path=(TextElement.Foreground)}"/>
</Style>

在我们的树将是这样的：

After that our tree will look like this:

Window (Red [Local]) 
  -> Grid (Red [Inherited]) 
     -> ListBox (Red [Inherited]) 
        -> ListBoxItem (Red [Inherited]) 
           -> StackPanel (Red [Inherited]) 
              -> Label (Red [Binding to StackPanel.(TextElement.Foreground)])
                 -> TextBlock (Red [Inherited])
              -> TextBlock (Red [Inherited])

正如你可以看到，我们的结合恢复继承。

As you can see, our binding restores the inheritance.

这样的风格需要为覆盖其风格的前景属性的每个元素进行定义。作为@Duane建议，不要重复在每个风格的支持算法FMP 功能可以用于绑定：

Such styles need to be defined for each element that overrides the Foreground property in its style. As @Duane suggested, to not duplicate the binding in each style the BasedOn capability can be used:

<Style x:Key="ForegroundInheritanceFixStyle"
       TargetType="Control">
    <Setter Property="Foreground"
            Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type FrameworkElement}}, Path=(TextElement.Foreground)}"/>
</Style>

<Style TargetType="{x:Type Label}"
       BasedOn="{StaticResource ForegroundInheritanceFixStyle}">
</Style>

<Style TargetType="{x:Type CheckBox}"
       BasedOn="{StaticResource ForegroundInheritanceFixStyle}">
</Style>

希望这有助于。

Hope this helps.

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