在DataGrid中修剪文本时的自动工具提示 [英] Automatic tooltip when text is trimmed in DataGrid

问题描述

我的应用程序使用C＃和WPF（.net framework 4.0）运行。我的目标是要有一个DataGrid，其中的单元格中的文本用省略号修饰，并且只有在单元格中的文本实际被修剪时，才自动显示工具提示并显示全文。

My application runs with C# and WPF (.net framework 4.0). My goal is to have a DataGrid in which the text in the cells is trimmed with an ellipsis, and automatically has a tooltip with the full text displayed only if the text in the cell is actually trimmed.

解决方案1 ​​：我目前正在使用它来了解文本是否被修剪： http://tranxcoder.wordpress.com/2008/10/12/customizing-lookful-wpf-controls-take-2/
问题是它仅在调整列大小时有效。解决方案2在第一次加载DataGrid，对列进行排序或更新DataGrid的ItemSource时，不会显示工具提示。

Solution 1: I'm currently using this to know if the text is trimmed or not: http://tranxcoder.wordpress.com/2008/10/12/customizing-lookful-wpf-controls-take-2/ The problem is that it only works when I resize the columns. The tooltips don't show up when the DataGrid is first loaded, when the columns are sorted, or when the ItemSource of the DataGrid is updated.

解决方案2 ：我也尝试过此操作： http://www.scottlogic.com/blog/2011/01/31/automatically-showing-tooltips-on-a-trimmed-textblock-silverlight-wpf.html
但是工具提示永远不会出现在我的DataGrid单元中，尽管它可以与孤立的文本块一起正常工作。

Solution 2: I've also tried this:http://www.scottlogic.com/blog/2011/01/31/automatically-showing-tooltips-on-a-trimmed-textblock-silverlight-wpf.html But the tooltips never appear on my DataGrid cells, while it works fine with isolated textblocks.

我正在寻找改善解决方案1的简单方法并使其在所有情况下都可以在我的DataGrid中工作，或者使用其他方法。

I'm looking for simple ways to improve Solution 1 and make it work in my DataGrid in all cases, or maybe a different approach.

解决方案1的样式：

<UserControl.Resources>
    <Style x:Key="TextColumnElementStyle" TargetType="TextBlock" BasedOn="{StaticResource TextBlockService}">
        <Style.Setters>
            <Setter Property="TextWrapping" Value="NoWrap" />
            <Setter Property="TextTrimming" Value="WordEllipsis" />
        </Style.Setters>
    </Style>
</UserControl.Resources>

TextBlockService的源代码

解决方案1的数据网格：

The DataGrid for Solution 1:

<DataGrid ItemsSource="{Binding IssueList}" tbs:TextBlockService.AutomaticToolTipEnabled="True">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Description" Binding="{Binding Description}" 
            ElementStyle="{StaticResource TextColumnElementStyle}">
    </DataGrid.Columns>
</DataGrid>

谢谢

推荐答案

我已经找到了基于 xr280xr的答案。
在任何情况下都可以直接使用，而无需使用其他代码。

I've found the perfect solution, based on an answer by xr280xr. It works out of the box, in any condition, and without using additional code.

我放入的样式; DataGrid.Resources> ：

<Style TargetType="{x:Type DataGridCell}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DataGridCell}">
                <TextBlock Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Content.Text}" TextTrimming="CharacterEllipsis">
                    <TextBlock.ToolTip>
                        <ToolTip Visibility="{Binding RelativeSource={RelativeSource Self}, Path=PlacementTarget, Converter={StaticResource TrimToVisConverter}}">
                            <ToolTip.Content>
                                <TextBlock Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Content.Text}"/>
                            </ToolTip.Content>
                        </ToolTip>
                    </TextBlock.ToolTip>
                 </TextBlock>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Converter = {StaticResource TrimToVisConverter} ：

public class TrimmedTextBlockVisibilityConverter : IValueConverter
{

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value == null) return Visibility.Collapsed;

        FrameworkElement textBlock = (FrameworkElement)value;

        textBlock.Measure(new System.Windows.Size(Double.PositiveInfinity, Double.PositiveInfinity));

        if (((FrameworkElement)value).ActualWidth < ((FrameworkElement)value).DesiredSize.Width)
            return Visibility.Visible;
        else
            return Visibility.Collapsed;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

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