从contentpresenter中的内容获取附加属性值-Java 学习之路

我创建了一个自定义窗口，其中包含在资源字典中定义的模板 . 窗口没有 Headers 栏 .

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                xmlns:dsControls="clr-namespace:Something">
<Style x:Key="WindowRegionStyle"
       TargetType="Window">
    /** Other setters **/
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ContentControl">
                <Grid>
                    <Border Background="{StaticResource WindowBackground}"
                            BorderBrush="{StaticResource BorderBrushColor}"
                            BorderThickness="1"
                            CornerRadius="8"
                            HorizontalAlignment="Center"
                            VerticalAlignment="Center">
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" />
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>

                            <Border CornerRadius="8,8,0,0"
                                    BorderBrush="{StaticResource BorderBrushColor}"
                                    Background="{StaticResource HeaderColor}"
                                    Grid.ColumnSpan="2"
                                    Grid.Row="0">
                                <Label Content="{Binding Path=(dsControls:WindowDetails.Title), RelativeSource={RelativeSource TemplatedParent}}"
                                       FontSize="20" />
                            </Border>

                            <ContentPresenter Grid.Row="1" Grid.ColumnSpan="2" Content="{TemplateBinding Content}" />

                        </Grid>
                    </Border>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

添加到此模板的内容是 UserControl . 这一切都有效 .

但现在我想在 UserControl 中定义一个 Headers . 为了设置 Headers ，我做了一个 attached property 'WindowDetails.Title' .

public static class WindowDetails
{
    public static string GetTitle(DependencyObject obj)
    {
        return (string)obj.GetValue(TitleProperty);
    }

    public static void SetTitle(DependencyObject obj, string value)
    {
        obj.SetValue(TitleProperty, value);
    }

    // Using a DependencyProperty as the backing store for Title.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty TitleProperty =
        DependencyProperty.RegisterAttached("Title", typeof(string), typeof(WindowDetails), new PropertyMetadata(""));

}

我在_352642中设置 Headers 如下：

<UserControl x:Class="Something.View"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:dsControls="clr-namespace:Something"
             Width="400"
             dsControls:WindowDetails.Title="Test">

      /** Some content **/
</UserControl>

The problem

我无法将属性值绑定到 template 中的标签 .

What I already tried (and went wrong)

<Label Content="{Binding Path=(dsControls:WindowDetails.Title), RelativeSource={RelativeSource TemplatedParent}}"
                                       FontSize="20" />

和

<Label Content="{Binding Path=(dsControls:WindowDetails.Title), RelativeSource={RelativeSource Self}}"
                                       FontSize="20" />

另外，更改 Attached property 的 OwnerType ：

到WindowDetails

public static readonly DependencyProperty TitleProperty = DependencyProperty.RegisterAttached（“Title”，typeof（string），typeof（WindowDetails），new PropertyMetadata（“”））;

当我这样做时，属性没有设置 . 但 label 的内容具有默认 property value .

To UserControl

public static readonly DependencyProperty TitleProperty = DependencyProperty.RegisterAttached（“Title”，typeof（string），typeof（UserControl），new PropertyMetadata（“”））;

当我这样做时，属性已设置，但 label 的内容没有值 .

Question

如何在 UserControl 中设置 attached property 并将其绑定到模板中 label 的内容？

提前致谢！

问候Loetn

2 回答

这是你如何做到这一点：给你的 ContentPresenter x:Name 并在绑定标签时引用它 .

<Border CornerRadius="8,8,0,0"
   BorderBrush="{StaticResource BorderBrushColor}"
   Background="{StaticResource HeaderColor}"
   Grid.ColumnSpan="2"
   Grid.Row="0">
   <Label Content="{Binding Path=Content.(dsControls:WindowDetails.Title), ElementName="myPresenter"}" FontSize="20" />
</Border>
<ContentPresenter x:Name="myPresenter" Grid.Row="1" Grid.ColumnSpan="2" Content="{TemplateBinding Content}" />

回复于 2024-05-05T21:56:55+08:00

尝试使用转换器

public class AttchedTitleToTitleConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (value as FrameworkElement).GetValue(WindowDetails.TitleProperty);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

将其添加到 ResourceDictionary ：

<local:AttchedTitleToTitleConverter x:Key="titleConverter"/>

在绑定中：

<Label Content="{Binding RelativeSource={RelativeSource Self}, Converter={DynamicResource titleConverter}}"/>

希望这可以帮助

回复于 2024-05-05T21:56:55+08:00

从contentpresenter中的内容获取附加属性值

2 回答

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