如何在 WPF RichTextBox 中将插入符号移动一定数量的位置? [英] How do I move the caret a certain number of positions in a WPF RichTextBox?

问题描述

我想将插入符号移动到当前插入符号所在位置的右侧.我注册了 PreviewKeyDown，并在捕获 Tab 键时调用 InsertTextInRun()，如下所示:

I want to move the caret 4 positions to the right of where my caret currently is. I'm registered for PreviewKeyDown, and calling InsertTextInRun() when the tab key is captured, like so:

private void rtb_PreviewKeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Tab)
    {
        rtb.CaretPosition.InsertTextInRun("    ");
        e.Handled = true;
    }
}

问题是在调用 InsertTextInRun() 后插入符号保持原位.它不会移动到新文本的末尾，这是我想要的行为.我该怎么做?

The problem is that the caret stays in place after the call to InsertTextInRun(). It does not move to the end of the new text, which is the behavior I want. How would I do this?

顺便说一句 - 是的，我知道 RichTextBox 上的 AcceptsTab 属性.我选择忽略 is 并滚动我自己的选项卡功能，因为使用 AcceptsTab 进行选项卡会产生令人讨厌的副作用，即在后续行中缩进文本，这不是我想要的.

As an aside - yes, I know about the AcceptsTab property on RichTextBox. I'm choosing to ignore is and roll my own tab functionality because tabbing with AcceptsTab has a nasty side effect of indenting text on subsequent lines, which is not what I want.

推荐答案

我刚刚遇到了同样的问题.似乎最终插入符号的位置取决于它在插入之前的移动方式.

I've just bumped into the same problem. It seems final caret position depends on which way it was moving right before the insert.

以下代码确保(3.5sp1)插入后，光标将位于插入文本的右侧:

Following code makes sure (3.5sp1) that after insert, the cursor will be to the right of the inserted text:

 rtb.CaretPosition = rtb.CaretPosition.GetPositionAtOffset(0, LogicalDirection.Forward);
rtb.CaretPosition.InsertTextInRun(text);

请注意，插入符号的 LogicalDirection 属性可能(并且必须)由此更改；仅仅创建正确的 TextPointer 是不够的.

Note that caret's LogicalDirection property may (and has to) be changed by this; it is not enough to simply create correct TextPointer.

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