Question

当ContentPresenter的content属性为String类型时，它会自动使用TextBlock作为其子元素。但我需要在我的应用程序中使用所有ContentPresenters来使用名为DynamicTextBlock（Silverlight中用于CharacterTrimming的用户控件）而不是默认的TextBlock控件。

我如何实现这样的目标？

Answer 1

您好我是WPF程序员。请检查此解决方案是否适用于Silverlight，请试一试并告诉我。在下面的代码中代替TextBlock（在DataTemplate中）使用你的silverlight文本块名称，让我知道结果。

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

        <DataTemplate DataType="{x:Type sys:String}" >
            <TextBlock Text="{Binding}" TextTrimming="CharacterEllipsis" Background="AliceBlue" Foreground="Red" />
            <!--In the above line, Remove the TextBlock and use your silvelight dynamic textblock name-->
        </DataTemplate>

    </Window.Resources>
    <Grid>
        <Button Content="Button" HorizontalAlignment="Left" Margin="204,146,0,0" VerticalAlignment="Top" Width="75"/>
    </Grid>
</Window>

Answer 2

让我们面对现实吧。微软已经证实Silverlight是致命的。如果可能的话，你应该跳到WPF。但是，让我试着回答你的问题。在wpf中有一些非常酷的东西，它被称为属性值继承。让我告诉你如何：

public class MyWpfExtension
{
    public static bool GetCharacterEllipsis(DependencyObject obj)
    {
        return (bool)obj.GetValue(CharacterEllipsisProperty);
    }

    public static void SetCharacterEllipsis(DependencyObject obj, bool value)
    {
        obj.SetValue(CharacterEllipsisProperty, value);
    }

    // Using a DependencyProperty as the backing store for CharacterEllipsis.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty CharacterEllipsisProperty =
        DependencyProperty.RegisterAttached("CharacterEllipsis", typeof(bool), typeof(MyWpfExtension),
        new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.Inherits, OnCharacterEllipsisChanged));

    private static void OnCharacterEllipsisChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is TextBlock && (bool)e.NewValue)
        {
            TextBlock tb = (TextBlock)d;
            tb.TextTrimming = TextTrimming.CharacterEllipsis;
        }
    }
}

顺便说一句，这是你可以看到的WPF。我不知道这对你有多大帮助，但你去了。我假设Silverlight也具有此属性值继承。

现在使用：

<StackPanel Background="Blue" local:MyWpfExtension.CharacterEllipsis ="True">
    <TextBlock>asdfsadfsadfsadfasdfsadfsadfsadfasdfsadfsadfsadf</TextBlock>
    <TextBlock>asdfsadfsadfsadfasdfsadfsadfsadfasdfsadfsadfsadf</TextBlock>
    <TextBlock>asdfsadfsadfsadfasdfsadfsadfsadfasdfsadfsadfsadf</TextBlock>
    <TextBlock>asdfsadfsadfsadfasdfsadfsadfsadfasdfsadfsadfsadf</TextBlock>
    <TextBlock>asdfsadfsadfsadfasdfsadfsadfsadfasdfsadfsadfsadf</TextBlock>
    <TextBlock>asdfsadfsadfsadfasdfsadfsadfsadfasdfsadfsadfsadf</TextBlock>
    <TextBlock>asdfsadfsadfsadfasdfsadfsadfsadf</TextBlock>
    <TextBlock>asdfsadfsadfsadfasdfsadfsadfsadf</TextBlock>
</StackPanel>

或者像这样：

<StackPanel Background="Blue" >
    <ContentPresenter local:MyWpfExtension.CharacterEllipsis="True" Content="fasdfasdfsdffasdfasdfsdffasdfasdfsdffasdfasdfsdf"></ContentPresenter>
</StackPanel>

基本上，您可以设置附加属性，并且该属性将继承到所有元素。如果元素是TextBlock，则将设置CharacterElipsis。

更改ContentPresenter中的默认文本块

2 个答案: