如何在段落上应用不同的样式?

时间:2016-07-27 16:34:12

标签: c# wpf user-interface fonts styles

我可以为按钮的内容应用不同的样式吗?例如,我有一个搜索框,如果用户在搜索框中输入“是”并单击搜索,我可以在按钮内容下面的两个“是”斜体字体吗?与此同时,我希望保留其余部分,不要斜体。

<Button
    Content="This is an example of button content. This is a very long content.">
   <Button.Style>
    ???
   </Button.Style>
</Button>

应用我希望按钮内容的样式后: 此按钮内容的示例。这个 是一个非常长的内容。

这可能吗?

3 个答案:

答案 0 :(得分:1)

Content可以是任何内容,例如TextBlock每个单词或文本片段包含Run,然后您可以单独设置样式。我不认为纯XAML方法在这里非常有用。如果您想在某个地方的资源中定义突出显示样式,那么在用户输入时在代码中有条件地应用该样式。

答案 1 :(得分:1)

如果你的内容是静态的,你可以简单地定义你的按钮:

<Button>
    <TextBlock>
         <Run Text="This"></Run>
         <Run Text="is" FontStyle="Italic"></Run>
         <Run Text="an example of button content. This"></Run>
         <Run Text="is" FontStyle="Italic"></Run>
         <Run Text="a very long content."></Run>
    </TextBlock>
</Button>

或:

<Button>
    <RichTextBox IsReadOnly="True" BorderThickness="0"> <!-- Other styles as needed -->
        <FlowDocument>
            <Paragraph>
                This
                <Italic>is</Italic> an example of button content. This
                <Italic>is</Italic> a very long content.
            </Paragraph>
        </FlowDocument>
    </RichTextBox>
</Button>

但是,对于风格动态的情况,我使用以下服务:

// Note: Not my code, but I can't find the original source
public static class RichTextBoxService
{
    public static string GetContent(DependencyObject obj)
    {
        return (string)obj.GetValue(ContentProperty);
    }

    public static void SetContent(DependencyObject obj, string value)
    {
        obj.SetValue(ContentProperty, value);
    }

    public static readonly DependencyProperty ContentProperty =
        DependencyProperty.RegisterAttached("Content",
        typeof(string), 
        typeof(RichTextBoxHelper),
        new FrameworkPropertyMetadata 
        {
            BindsTwoWayByDefault = true,
            PropertyChangedCallback = OnDocumentChanged,
        });

    private static void OnDocumentChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        var richTextBox = (RichTextBox)obj;

        // Parse the XAML content to a document (or use XamlReader.Parse())
        var xaml = GetContent(richTextBox);
        var doc = new FlowDocument();
        var range = new TextRange(doc.ContentStart, doc.ContentEnd);

        range.Load(new MemoryStream(Encoding.UTF8.GetBytes(xaml)), DataFormats.Xaml);

        richTextBox.Document = doc;

        // When the document changes update the source
        range.Changed += (s, args) =>
        {
            if (richTextBox.Document == doc)
            {
                MemoryStream buffer = new MemoryStream();
                range.Save(buffer, DataFormats.Xaml);

                SetContent(richTextBox, Encoding.UTF8.GetString(buffer.ToArray()));
            }
        };
    }
}

然后,您可以像按钮一样使用它:

查看:

<Window xmlns:services="clr-namespace:MyProject.Services;assembly=MyProject">

    <Button>
        <RichTextBox IsReadOnly="True" BorderThickness="0" services:RichTextBoxService.Content="{Binding ButtonContent}" />
    </Button>

<强>视图模型:

// Note: I can't remember is Section is required or not
private const string Header = @"<Section xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""><Paragraph>";

private const string DefaultContent = "This is an example of button content. This is a very long content";

private const string Footer = "</Paragraph></Section>";

private string _search;
public string Search
{ 
    get { return _search; }
    set {
         if (Set(ref _search, value))  // using MVVMLight
         {
             // search value was updated
             this.ButtonContent = Header + DefaultContent.Replace(value, "<Italic>" + value + "</Italic>") + Footer;
         }
    }
}

答案 2 :(得分:0)

我只需定义您的按钮,如下所示:

ProprietaryName

然后我会使用ValueConverter来检查用户是否按下了另一个按钮来改变样式。

这样的事情:

mediawiki

您必须添加逻辑才能将其转换回正常