5

我有一个带有包含 ContentPresenter 的模板的按钮样式,我在其中尝试将路径的填充绑定到按钮的前景:

<!-- This is inside the template of a button style -->
<ContentPresenter>
 <ContentPresenter.Resources>
  <Style TargetType="{x:Type Path}">
   <Setter Property="Fill" Value="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType=Button}}"/>
   </Style>
  </ContentPresenter.Resources>
</ContentPresenter>

我还有一个没有设置填充的路径,我可以在按钮中引用它作为内容,如下所示:

<Button Style="{DynamicResource MyButtonStyle}" Content="{DynamicResource PathIcon}" Foreground="Blue"/>

我希望按钮内的路径是蓝色的,但它不是......它不会从按钮中抓取前景。

如何让路径绑定到按钮的颜色?

谢谢!

PS:

如果我在值中放置硬编码颜色(即 Value="Red"),则按钮内的路径为红色......所以我知道这可行......

<ContentPresenter>
 <ContentPresenter.Resources>
  <Style TargetType="{x:Type Path}">
   <Setter Property="Fill" Value="Red"/>
   </Style>
  </ContentPresenter.Resources>
</ContentPresenter>

编辑:

这是完整的样式和控制模板:

<Style x:Key="Button_Style" TargetType="{x:Type Button}">
        <Setter Property="Foreground" Value="{StaticResource White_Brush}"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Grid x:Name="grid" Background="Transparent">
                        <ContentPresenter>
                            <ContentPresenter.Resources>
                                <Style TargetType="{x:Type Path}">
                                    <Setter Property="Fill" Value="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType=Button}}"/>
                                </Style>
                            </ContentPresenter.Resources>
                        </ContentPresenter>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                               <!-- Should affect Text as well as Paths in the Content property of the button! -->                              
                               <Setter Property="Foreground" Value="{StaticResource Black_Brush}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
4

2 回答 2

7

好,我们下单:

它不会从按钮中获取前景。

在样式中,这种结构:

RelativeSource={RelativeSource AncestorType=Button}

不会工作,因为Style只是setter的集合,他不知道控制,有没有,特别是关于可视化树的内容。因为应该在可视化树中RelativeSource参考上面的项目。为此,通常使用DataTemplateor ControlTemplate

如果我在值中放置硬编码颜色(即 Value="Red")

是的,在这种情况下,它将起作用,并且总是更好地创建表单的设计:

<SolidColorBrush x:Key="MyButtonColor" Color="Blue" />

并将其用于控制​​,例如Button

<Button Background="{StaticResource MyButtonColor}" ... />

Style或其他地方:

<Setter Property="Fill" Value="{StaticResource MyButtonColor}" />   

也就是说,最好不要依赖位于可视化树中的元素参数(背景颜色等),因为它可以:

  • 可以移动到另一个面板 ( Grid, StackPanel) 或UserControl
  • 可能会离开项目

而作为资源中的刷子,总是会在一个地方,在这个地方改变它们,把它们的所有元素都拾取。颜色也可以存储在不依赖于特定技术实现(资源、变量)的特殊数据模型中,其中数据可以来自外部源,例如项目/配置设置。

如果可能,最好避免由于不必要地使用系统性能(以及在某些情况下内存泄漏)而使用动态资源,在您的情况下它们是不需要的。

动态资源通常是为SolidColorBrush其他物种的画笔明确定义的,因为默认情况下它们是冻结的,并且由于上述原因(内存泄漏),不建议更改它们。更多信息可以在这里找到:

MSDN 上的可冻结对象概述

Edit

据我了解,你要使StyleforButton的内容通用化PathText(在同时使用的情况下会更容易)。正如我在上面已经提到的,RelativeSource应该在 附近ControlTemplate,因此,PathGridContentPresenter.

To style known,为文本或路径提供,到Tag(可选属性)表示两个属性:OnlyTextOnlyPath

为了设置 的数据Path,我创建了一个附加的依赖属性,并在ControlTemplate.

下面是一个完整的例子:

XAML

<Window x:Class="ButtonPathHelp.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:ButtonPathHelp"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    WindowStartupLocation="CenterScreen"
    Title="MainWindow" Height="350" Width="525">

    <Window.Resources>
        <SolidColorBrush x:Key="Green_Brush" Color="Green" />
        <SolidColorBrush x:Key="Black_Brush" Color="Black" />

        <Style x:Key="Button_Style" TargetType="{x:Type Button}">
            <Setter Property="Foreground" Value="{StaticResource Green_Brush}" />
            <Setter Property="HorizontalAlignment" Value="Center" />
            <Setter Property="VerticalAlignment" Value="Center" />

            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Grid x:Name="grid">
                            <ContentPresenter x:Name="MyContent"
                                              Content="{TemplateBinding Content}"
                                              HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                                              VerticalAlignment="{TemplateBinding VerticalAlignment}" />

                            <Path x:Name="MyPath" 
                                  SnapsToDevicePixels="True" 
                                  Width="20" 
                                  Height="18" 
                                  Stretch="Fill" 
                                  Fill="{Binding Path=Foreground, RelativeSource={RelativeSource AncestorType={x:Type Button}}}" 
                                  Data="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=(local:MyDependencyClass.DataForPath)}" />
                        </Grid>

                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Foreground" Value="{StaticResource Black_Brush}"/>
                            </Trigger>

                            <Trigger Property="Tag" Value="OnlyText">
                                <Setter TargetName="MyPath" Property="Visibility" Value="Collapsed" />
                                <Setter TargetName="MyContent" Property="Visibility" Value="Visible" />
                            </Trigger>

                            <Trigger Property="Tag" Value="OnlyPath">
                                <Setter TargetName="MyPath" Property="Visibility" Value="Visible" />
                                <Setter TargetName="MyContent" Property="Visibility" Value="Collapsed" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>

    <WrapPanel>
        <WrapPanel.Resources>
            <sys:String x:Key="Save">
                F1 M 20.5833,20.5833L 55.4167,20.5833L 55.4167,55.4167L 45.9167,55.4167L 45.9167,44.3333L 30.0833,44.3333L 30.0833,
                55.4167L 20.5833,55.4167L 20.5833,20.5833 Z M 33.25,55.4167L 33.25,50.6667L 39.5833,50.6667L 39.5833,55.4167L 33.25,
                55.4167 Z M 26.9167,23.75L 26.9167,33.25L 49.0833,33.25L 49.0833,23.75L 26.9167,23.75 Z
            </sys:String>

            <sys:String x:Key="Search">
                F1 M 23.4454,49.2637L 31.7739,41.1598C 30.6986,39.2983 30.4792,37.1377 30.4792,34.8333C 30.4792,27.8377 35.7544,
                22.1667 42.75,22.1667C 49.7456,22.1667 55.4167,27.8377 55.4167,34.8333C 55.4167,41.8289 49.7456,47.1042 42.75,
                47.1042C 40.5639,47.1042 38.5072,46.9462 36.7125,45.9713L 28.3196,54.1379C 27.0829,55.3746 24.6821,55.3746 23.4454,
                54.1379C 22.2088,52.9013 22.2088,50.5004 23.4454,49.2637 Z M 42.75,26.9167C 38.3777,26.9167 34.8333,30.4611 34.8333,
                34.8333C 34.8333,39.2056 38.3777,42.75 42.75,42.75C 47.1222,42.75 50.6667,39.2056 50.6667,34.8333C 50.6667,
                30.4611 47.1222,26.9167 42.75,26.9167 Z
            </sys:String>
        </WrapPanel.Resources>

        <Button Name="SaveButton"
                Style="{StaticResource Button_Style}" 
                Tag="OnlyPath"
                local:MyDependencyClass.DataForPath="{StaticResource Save}"
                Margin="10" />

        <Button Name="JustText"
                Style="{StaticResource Button_Style}" 
                Tag="OnlyText"
                Content="Just Text"
                Margin="10" />

        <Button Name="SearchButton"
                Style="{StaticResource Button_Style}" 
                Tag="OnlyPath"
                local:MyDependencyClass.DataForPath="{StaticResource Search}"
                Margin="10" />
    </WrapPanel>
</Window>

Code behind

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
}

public class MyDependencyClass : DependencyObject
{
    #region IsCheckedOnDataProperty

    public static readonly DependencyProperty DataForPathProperty;

    public static void SetDataForPath(DependencyObject DepObject, string value)
    {
        DepObject.SetValue(DataForPathProperty, value);
    }

    public static string GetDataForPath(DependencyObject DepObject)
    {
        return (string)DepObject.GetValue(DataForPathProperty);
    }

    #endregion

    static MyDependencyClass()
    {
        PropertyMetadata MyPropertyMetadata = new PropertyMetadata(String.Empty);

        DataForPathProperty = DependencyProperty.RegisterAttached("DataForPath",
                                                            typeof(string),
                                                            typeof(MyDependencyClass),
                                                            MyPropertyMetadata);
    }
}

Note:Style我没有将 TemplateBinding 用于附加属性中,因为 TemplateBinding 在模板之外或其 VisualTree 属性之外不起作用,因此您甚至不能在模板的触发器中使用 TemplateBinding。因此,我们必须使用构造{RelativeSource TemplatedParent}和 Path 等于要检索其值的依赖属性。

Output

在此处输入图像描述

要下载整个示例,请点击此链接

于 2013-11-01T07:57:16.093 回答
0

我偶然发现了类似的问题,但想知道如何在 DISABLED 状态下获得按钮的“前景颜色”(以使我的绘图具有正确的颜色)。这是一个最终简单的解决方案。没有模板,没有样式,没有代码,什么都没有。恰到好处的相对绑定:-):

     <StackPanel Orientation="Horizontal">
        <Button Height="22" IsEnabled="False">
            <Polygon Points="4,0 4,5 5,5 2.5,10 0,5 1,5 1,0 " 
                     Fill="{Binding (TextElement.Foreground), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}}}">
                <Polygon.LayoutTransform>
                    <RotateTransform Angle="90"></RotateTransform>
                </Polygon.LayoutTransform>
            </Polygon>
        </Button>
        <Button Height="22" IsEnabled="True">
            <Polygon Points="4,0 4,5 5,5 2.5,10 0,5 1,5 1,0 " 
                     Fill="{Binding (TextElement.Foreground), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContentPresenter}}}">
                <Polygon.LayoutTransform>
                    <RotateTransform Angle="180"></RotateTransform>
                </Polygon.LayoutTransform>
            </Polygon>
        </Button>
    </StackPanel>
于 2016-10-30T16:51:01.033 回答