仅当某些条件为真时，才通过绑定将TextBlock设为粗体 [英] Make TextBlock Bold only if certain condition is true, via Binding

问题描述

我如何通过Binding到bool将TextBlock定义为粗体?

How can I define a TextBlock as FontStyle is Bold, via a Binding to a bool?

<TextBlock 
   Text="{Binding Name}"
   FontStyle="???">

我真的很想将其绑定到

public bool NewEpisodesAvailable
{
    get { return _newEpisodesAvailable; }
    set
    {
        _newEpisodesAvailable = value;
        OnPropertyChanged();
    }
}

是否有办法实现这一目标，还是应该由我的Model属性为我完成翻译，而不是直接显示FontStyle而不显示bool?

Is there a way to achieve this, or should my Model property do the translation for me, instead of presenting a bool present the FontStyle directly?

推荐答案

您可以通过DataTrigger这样实现:

    <TextBlock>
        <TextBlock.Style>
            <Style TargetType="TextBlock">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding NewEpisodesAvailable}"
                                 Value="True">
                        <Setter Property="FontWeight" Value="Bold"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </TextBlock.Style>
    </TextBlock>

或者您可以使用

Or you can use IValueConverter which will convert bool to FontWeight.

public class BoolToFontWeightConverter : DependencyObject, IValueConverter
{
    public object Convert(object value, Type targetType,
                          object parameter, CultureInfo culture)
    {
        return ((bool)value) ? FontWeights.Bold : FontWeights.Normal;
    }

    public object ConvertBack(object value, Type targetType,
                              object parameter, CultureInfo culture)
    {
        return Binding.DoNothing;
    }
}

XAML:

<TextBlock FontWeight="{Binding IsEnable,
                        Converter={StaticResource BoolToFontWeightConverter}}"/>

确保在XAML中将转换器声明为资源.

Make sure you declare converter as resource in XAML.

这篇关于仅当某些条件为真时，才通过绑定将TextBlock设为粗体的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！