方法获取word游标是，在WPF RichTextBox控件中 [英] Way to obtain the word cursor is on, in WPF RichTextBox Control

问题描述

我想知道如何在WPF RichTextBox中获得当前光标所在的单词。我知道RichTextBox有选择属性。但是，这只会给我在RichTextBox中突出显示的文本。相反，我想知道光标所在的单词，即使整个单词没有突出显示。



任何提示都会被感谢。

I would like to know how I can get the word that current cursor is on, in WPF RichTextBox. I am aware that RichTextBox has Selection Property. However, this only gives me the text that is highlighted in the RichTextBox. Instead I would like to know the word the cursor is on even if the whole word is not highlighted.

Any tips are appreciated.

Thank you very much.

推荐答案

将此函数附加到任意RichTextBox，现在称为testRTB， for result：

Attach this function to an arbitrary RichTextBox, now called testRTB, and see Output window for results:

private void testRTB_MouseUp(object sender, MouseButtonEventArgs e)
{
        TextPointer start = testRTB.CaretPosition;  // this is the variable we will advance to the left until a non-letter character is found
        TextPointer end = testRTB.CaretPosition;    // this is the variable we will advance to the right until a non-letter character is found

        String stringBeforeCaret = start.GetTextInRun(LogicalDirection.Backward);   // extract the text in the current run from the caret to the left
        String stringAfterCaret = start.GetTextInRun(LogicalDirection.Forward);     // extract the text in the current run from the caret to the left

        Int32 countToMoveLeft = 0;  // we record how many positions we move to the left until a non-letter character is found
        Int32 countToMoveRight = 0; // we record how many positions we move to the right until a non-letter character is found

        for (Int32 i = stringBeforeCaret.Length - 1; i >= 0; --i)
        {
            // if the character at the location CaretPosition-LeftOffset is a letter, we move more to the left
            if (Char.IsLetter(stringBeforeCaret[i]))
                ++countToMoveLeft;
            else break; // otherwise we have found the beginning of the word
        }


        for (Int32 i = 0; i < stringAfterCaret.Length; ++i)
        {
            // if the character at the location CaretPosition+RightOffset is a letter, we move more to the right
            if (Char.IsLetter(stringAfterCaret[i]))
                ++countToMoveRight;
            else break; // otherwise we have found the end of the word
        }



        start = start.GetPositionAtOffset(-countToMoveLeft);    // modify the start pointer by the offset we have calculated
        end = end.GetPositionAtOffset(countToMoveRight);        // modify the end pointer by the offset we have calculated


        // extract the text between those two pointers
        TextRange r = new TextRange(start, end);
        String text = r.Text;


        // check the result
        System.Diagnostics.Debug.WriteLine("[" + text + "]");
}

将Char.IsLetter（...）更改为Char.IsLetterOrDigit 。）或任何其他适当的，取决于您是否希望保持数字。

Change Char.IsLetter(...) to Char.IsLetterOrDigit(...) or whatever else appropriately depending on whether you wish to keep digits as well.

提示：将此解压到一个单独的程序集中的扩展方法，以便在需要时访问它。

Tip: extract this into an extension method in a separate assembly to access it whenever needed.

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