仅显示列中长文本的两行

时间:2018-02-17 13:11:29

标签: wpf xaml textblock

我在DataGrid中有一列显示短信。不幸的是它太长了。因此,我在textblock使用TextWrapping = "Wrap"

中自定义了单元格列模板

显示多行。我不想要它。我只想显示前两行,最后添加省略号(...)

有办法吗?

1 个答案:

答案 0 :(得分:1)

要实现这一点,您需要定义自定义Behavior,首先确保添加 System.Windows.Interactivity 命名空间(它是 Expression.Blend.Sdk的一部分) ,使用NuGet安装它: Install-Package Expression.Blend.Sdk ),这里是一个基本实现(功劳归@Itzalive):

public class NumLinesBehaviour : Behavior<TextBlock>
    {
        public static readonly DependencyProperty MaxLinesProperty =
            DependencyProperty.RegisterAttached(
                "MaxLines",
                typeof(int),
                typeof(NumLinesBehaviour),
                new PropertyMetadata(default(int), OnMaxLinesPropertyChangedCallback));

        public static void SetMaxLines(DependencyObject element, int value)
        {
            element.SetValue(MaxLinesProperty, value);
        }

        public static int GetMaxLines(DependencyObject element)
        {
            return (int)element.GetValue(MaxLinesProperty);
        }

        private static void OnMaxLinesPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is TextBlock element) element.MaxHeight = GetLineHeight(element) * GetMaxLines(element);
        }

        public static readonly DependencyProperty MinLinesProperty =
            DependencyProperty.RegisterAttached(
                "MinLines",
                typeof(int),
                typeof(NumLinesBehaviour),
                new PropertyMetadata(default(int), OnMinLinesPropertyChangedCallback));

        public static void SetMinLines(DependencyObject element, int value)
        {
            element.SetValue(MinLinesProperty, value);
        }

        public static int GetMinLines(DependencyObject element)
        {
            return (int)element.GetValue(MinLinesProperty);
        }

        private static void OnMinLinesPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is TextBlock element) element.MinHeight = GetLineHeight(element) * GetMinLines(element);
        }

        private static double GetLineHeight(TextBlock textBlock)
        {
            double lineHeight = textBlock.LineHeight;
            if (double.IsNaN(lineHeight))
                lineHeight = Math.Ceiling(textBlock.FontSize * textBlock.FontFamily.LineSpacing);
            return lineHeight;
        }
    }

现在让我们说DataGrid ObservableCollection TestClass Name NumLinesBehaviour与&#34; Behavior&#34;属性,<Window ... xmlns:local="clr-namespace:YourNameSpace" Title="MainWindow" Height="350" Width="525" DataContext="{Binding RelativeSource={RelativeSource Self}}"> <Window.Resources> <DataTemplate x:Key="CellTemplate"> <StackPanel Orientation="Horizontal"> <TextBlock Width="200" TextWrapping="Wrap" local:NumLinesBehaviour.MaxLines="2" TextTrimming="WordEllipsis" LineStackingStrategy="BlockLineHeight" Text="{Binding Name}"/> </StackPanel> </DataTemplate> </Window.Resources> <Grid> <DataGrid ItemsSource="{Binding DgCollection}" AutoGenerateColumns="False"> <DataGrid.Columns> <DataGridTemplateColumn Header="Name" CellTemplate="{StaticResource CellTemplate}" /> </DataGrid.Columns> </DataGrid> </Grid> TextTrimming的基本用法如下:

TextBlock

务必将WordEllipsis的{​​{1}}设置为&#34; i&#34;。

<强>更新

输出看起来像这样:

output

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