wpf - TemplateBinding 在某些情况下不起作用(使用 TranslateTransform 时)

Question

这就是我在 WPF 中重现这个问题的方式:

创建自定义控件:

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

public string Text
{
    get { return (string)GetValue(TextProperty); }
    set { SetValue(TextProperty, value); }
}

// Using a DependencyProperty as the backing store for Text.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty TextProperty =
    DependencyProperty.Register("Text", typeof(string), typeof(TestCustomControl), new PropertyMetadata("Hello"));

public double OffSet
{
    get { return (double)GetValue(OffSetProperty); }
    set { SetValue(OffSetProperty, value); }
}

// Using a DependencyProperty as the backing store for OffSet.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty OffSetProperty =
    DependencyProperty.Register("OffSet", typeof(double), typeof(TestCustomControl), new PropertyMetadata(5.0));
}

在 Generic.xaml 文件中为其添加样式:

<Style TargetType="local:TestCustomControl">
<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="local:TestCustomControl">
            <Grid>
                <TextBlock Text="{TemplateBinding Text}"></TextBlock>
                <TextBlock Text="{TemplateBinding Text}">
                    <TextBlock.RenderTransform>
                        <TranslateTransform X="{TemplateBinding OffSet}" Y="{TemplateBinding OffSet}"/>
                        <!--<TranslateTransform X="10" Y="10"/>-->
                    </TextBlock.RenderTransform>
                </TextBlock>
            </Grid>
        </ControlTemplate>
    </Setter.Value>
</Setter>

然后将其添加到主窗口:

<local:TestCustomControl OffSet="32" Text="the off set is not working" FontSize="36">

    </local:TestCustomControl>

然后运行应用程序，结果“文本”工作正常，但“偏移”不起作用。
而我在Windows Phone 7开发环境中尝试了类似的东西，得到了同样的结果。

我应该如何修改代码以使 OffSet 工作？

谢谢

Answer 1

尝试:

{Binding Offset, RelativeSource={RelativeSource TemplatedParent}}