在 RichTextBox 中设置插入符号/光标位置 - WPF [英] Set Caret/Cursor Position in RichTextBox - WPF

问题描述

如何在 WPF 中的 RichTextBox 中设置插入符号/光标位置?

How to set caret/cursor position in RichTextBox in WPF?

我使用 MSDN CaretPosition 但是好像不能设置光标?

I use the code in MSDN CaretPosition but it seems the cursor can't be set?

// Create a new FlowDocument, and add 3 paragraphs.
FlowDocument flowDoc = new FlowDocument();
flowDoc.Blocks.Add(new Paragraph(new Run("Paragraph 1"))); 
flowDoc.Blocks.Add(new Paragraph(new Run("Paragraph 2"))); 
flowDoc.Blocks.Add(new Paragraph(new Run("Paragraph 3")));
// Set the FlowDocument to be the content for a new RichTextBox.
RichTextBox rtb = new RichTextBox(flowDoc);

// Get the current caret position.
TextPointer caretPos = rtb.CaretPosition;

// Set the TextPointer to the end of the current document.
caretPos = caretPos.DocumentEnd;

// Specify the new caret position at the end of the current document.
rtb.CaretPosition = caretPos;

推荐答案

如何在 WPF 中的 RichTextBox 中设置插入符号/光标位置?

How to set caret/cursor position in RichTextBox in WPF?

假设 rtb 是您的 RichTextBox 的名称，具有不同的 Blocks and Inlines，可以通过以下方式设置文档开头的Caret:

Assuming thatrtb is the name of your RichTextBox, with different Blocks and Inlines, you can set the Caret at the beginning of the document by:

rtb.CaretPosition = rtb.CaretPosition.DocumentStart;

或在其末尾:

rtb.CaretPosition = rtb.CaretPosition.DocumentEnd;

另一方面，假设您有一个特定的段落或块，例如:

On the other hand, assuming that you have a specific Paragraph or Block, such as:

Block blk = rtb.Document.Blocks.ElementAt(1);

您可以将插入符号设置为其开头

You can set caret to its start

rtb.CaretPosition = blk.ContentStart;

或者它的结束

rtb.CaretPosition = blk.ContentEnd;

或者如果你有一个特定的内联，比如

or if you have a specific Inline such as

Run r = ((Paragraph)rtb.Document.Blocks.ElementAt(0)).Inlines.ElementAt(1) as Run;

你也可以使用

rtb.CaretPosition = r.ContentStart;
rtb.CaretPosition = r.ContentEnd;

当然，如果您正在处理具有从右到左和从左到右文本的复杂段落，您可能需要考虑

Of course, if you are working with Complex paragraph with both right-to-left and left-to-right text, you might need to consider

rtb.CaretPosition = blk.ElementStart;
rtb.CaretPosition = blk.ElementEnd;

还要注意在 TextPointer，您可以使用它来访问文档/块/内联的不同部分:

Also note different methods implemented in a TextPointer, which you can use to reach different parts of the document/Blocks/Inlines:

rtb.CaretPosition = rtb.CaretPosition.GetLineStartPosition(0);
rtb.CaretPosition = rtb.CaretPosition.GetPositionAtOffset(2);

有关更多方法和更多信息，请参阅链接.

See the link for more methods and more information.

最后，您可能希望使用在块或内联中实现的 BringIntoView 方法:

At the end, you might want to use BringIntoView method implemented in a Block or Inline:

blk.BringIntoView();
r.BringIntoView();

并设置键盘焦点，以查看插入符号的闪烁:

and also setting the keyboard focus, to see the blinking of the Caret:

Keyboard.Focus(rtb);

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