Question

我有一个简单的自定义控件，我有一个ControlTemplate。我似乎无法从控件上的Button获取命令来路由到TemplatedParent的命令。

<Style x:Key="SaveButtonStyle" TargetType="{x:Type Controls:SaveButton}">
    <Style.Resources>
        <converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter"/>
    </Style.Resources>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Controls:SaveButton}">
                <DockPanel Width="65" Height="21" LastChildFill="True">
                    <Canvas DockPanel.Dock="Left" HorizontalAlignment="Right" Margin="0 0 -49 0" ZIndex="1" IsHitTestVisible="False" >
                        <Image Source="Images/green-check.png" Width="16" Height="16" Visibility="{Binding IsDirty, Converter={StaticResource BoolToVisibilityConverter}}" Canvas.Top="-3" RenderOptions.BitmapScalingMode="Fant" />
                    </Canvas>
                    <Button DockPanel.Dock="Left" HorizontalAlignment="Left" Width="40" Height="21" FontSize="10"
                            Content="{Binding SaveButton.Content, RelativeSource={RelativeSource TemplatedParent}, FallbackValue={x:Static Localization:Strings.Save}}" 
                            Command="{Binding SaveButton.Command, RelativeSource={RelativeSource TemplatedParent}}"
                            CommandParameter="{Binding SaveButton.CommandParameter, RelativeSource={RelativeSource TemplatedParent}}" />
                </DockPanel>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

和此：

public class SaveButton : Button {
    public static readonly DependencyProperty IsDirtyProperty = DependencyProperty.Register("IsDirty", typeof(bool), typeof(SaveButton));

    static SaveButton() {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(SaveButton), new FrameworkPropertyMetadata(typeof(SaveButton)));
    }

    [Bindable(true), Category("Action")]
    [Localizability(LocalizationCategory.NeverLocalize)]
    public bool IsDirty {
        get { return (bool)GetValue(IsDirtyProperty); }
        set { SetValue(IsDirtyProperty, value); }
    }
}

和（最后）：

<Controls:SaveButton Command="{Binding Save}" IsDirty="{Binding IsDirty}" Style="{DynamicResource SaveButtonStyle}"/>

有趣的是，IsDirty和Content绑定似乎正常工作。这只是命令路由似乎无法正常工作。

Answer 1

您绑定到属性路径SaveButton.Button，并以TemplatedParent为源。因此，您的绑定源是您正在模板化的Button，但Button不包含SaveButton属性。

尝试在属性路径中配置不带SaveButton的绑定，如下所示：

  <Button DockPanel.Dock="Left" HorizontalAlignment="Left" Width="40" Height="21" FontSize="10"
          Content="{Binding Content, RelativeSource={RelativeSource TemplatedParent}, FallbackValue={x:Static Localization:Strings.Save}}" 
          Command="{Binding Command, RelativeSource={RelativeSource TemplatedParent}}"
          CommandParameter="{Binding CommandParameter, RelativeSource={RelativeSource TemplatedParent}}" />

此外，您可以使用{TemplateBinding..}扩展名来缩短语法。

另一件事，为什么你在Button的模板中有SaveButton控件。我认为你应该只重新尝试按钮的视觉外观，但行为已经存在，你不需要Button内的Button。您可以简单地使用您正在模板化的Button的Command属性，不需要此命令路由。

修改

试试这个模板

<Style x:Key="SaveButtonStyle" TargetType="{x:Type Controls:SaveButton}"> <Style.Resources> <converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter"/> </Style.Resources> <Setter Property="Content" Value="Save"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Controls:SaveButton}"> <DockPanel Width="65" Height="21" LastChildFill="True"> <Canvas DockPanel.Dock="Left" HorizontalAlignment="Right" Margin="0 0 -49 0" ZIndex="1" IsHitTestVisible="False" > <Image Source="Images/green-check.png" Width="16" Height="16" Visibility="{Binding IsDirty, Converter={StaticResource BoolToVisibilityConverter}}" Canvas.Top="-3" RenderOptions.BitmapScalingMode="Fant" /> </Canvas> <ContentPresenter DockPanel.Dock="Left"/> </DockPanel> </ControlTemplate> </Setter.Value> </Setter>

按钮的内容（“保存”）在样式设定器中设定。如果您想要其他内容，可以使用以下按钮：

<Controls:SaveButton Content="Something" Command="{Binding Save}" IsDirty="{Binding IsDirty}" Style="{DynamicResource SaveButtonStyle}"/>

将命令路由到模板化父级

1 个答案: