标签:c cursor wpf richtextbox selection
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Selection属性.但是,这只给了我在RichTextBox中突出显示的文本.相反,即使整个单词没有突出显示,我也想知道光标所在的单词.
任何提示都表示赞赏.
非常感谢你.
解决方法:
将此函数附加到任意RichTextBox(现在称为testRTB),并查看结果的“输出”窗口:
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 + "]");
}
根据您是否也希望保留数字,将Char.IsLetter(…)更改为Char.IsLetterOrDigit(…)或其他任何其他内容.
提示:将其提取到单独程序集中的扩展方法中,以便在需要时访问它.
标签:c,cursor,wpf,richtextbox,selection 来源: https://codeday.me/bug/20190530/1182256.html
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