RichTextBox用鼠标点击后得到完整的单词

Question

如何在点击时获得整个单词？我知道类似的问题已经出现并且我看过了，但出于某种原因，40 行代码有奇怪且非常古老的解决方案。也许有更现代的东西？

Answer 1

使用事件PreviewMouseDown来select整个词。当然，根据你想要的功能，可以使用类似的事件

private void richTextBox_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
    TextSelection ts = richTextBox.Selection;
    string text = ts.Text;
    if (!string.IsNullOrEmpty(text))
        MessageBox.Show(text);
}

Answer 2

下面的代码演示了如何获取 RichTextBox 控件中当前插入符位置的单词。

XAML:

<Window ... >
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <RichTextBox Grid.Row="0" x:Name="rtb" AllowDrop="True" VerticalScrollBarVisibility="Auto" Padding="2"
                    PreviewMouseUp="rtb_PreviewMouseUp" >
            <FlowDocument>
                <Paragraph FontSize="18" TextAlignment="Left" >

                   <!-- The RichTextBox control content should defined be here
                        or use the PASTE command to add some content... -->

                </Paragraph>
            </FlowDocument>
        </RichTextBox> 
        <Button Grid.Row="2" Click="Button_Click">Mark Current Word</Button>                   
    </Grid>
</Window>

下面的函数获取一个指针，指向从指定方向解析文本的位置，以检测单词边界。 pattern 变量定义了一组可能的单词分隔符。

public static class TextPointerExt
{
    public static TextPointer GetEdgeTextPointer(this TextPointer position, LogicalDirection direction)
    {
        string pattern = @" ,;.!""?"; // Delimiters 
        int step = direction == LogicalDirection.Forward ? 1 : -1;    
        for (; position != null;)
        {
            var text = position.GetTextInRun(direction);    
            int offset = 0;
            int i = direction == LogicalDirection.Forward ? 0 : text.Length - 1;

            for (; i >= 0 && i < text.Length; offset++, i += step)
            {
                if (pattern.Contains(text[i]))
                {
                    return position.GetPositionAtOffset(offset * step, LogicalDirection.Forward);
                }
            }

            position = position.GetPositionAtOffset(offset * step, LogicalDirection.Forward);
            for (TextPointer latest = position; ;)
            {
                if ((position = position.GetNextContextPosition(direction)) == null)
                    return latest;

                var context = position.GetPointerContext(direction);
                var adjacent = position.GetAdjacentElement(direction);    
                if (context == TextPointerContext.Text)
                {
                    if (position.GetTextInRun(direction).Length > 0)
                        break;
                }
                else if (context == TextPointerContext.ElementStart && adjacent is Paragraph)
                {
                    return latest;
                }
            }
        }
        return position;
    }
}

使用GetEdgeTextPointer()方法判断当前指向的词的例子：

public void GetCurrentWord()
{          
    TextPointer current = rtb.CaretPosition;
    var start = current.GetEdgeTextPointer(LogicalDirection.Backward); // Word position before caret
    var end = current.GetEdgeTextPointer(LogicalDirection.Forward); // Word position after caret

    if (start is TextPointer && end is TextPointer && start.CompareTo(end) != 0)
    {
        TextRange textrange = new TextRange(start, end);
        // Print the found word to the debug window.
        System.Diagnostics.Debug.WriteLine(textrange.Text);

        // Select the found word
        rtb.Selection.Select(start, end);
    }
    rtb.Focus();
}

private void rtb_PreviewMouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    GetCurrentWord();
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    GetCurrentWord();
}

RichTextBox用鼠标点击后得到完整的单词

RichTextBox get full word after clicking on it with the mouse

c#

wpf

richtextbox