C# 在RichTextBox-WPF中设置插入符号/光标位置
如何在WPF的RichTextBox中设置插入符号/光标位置 我在中使用了代码,但似乎无法设置光标C# 在RichTextBox-WPF中设置插入符号/光标位置,c#,wpf,richtextbox,C#,Wpf,Richtextbox,如何在WPF的RichTextBox中设置插入符号/光标位置 我在中使用了代码,但似乎无法设置光标 // 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("Par
// 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;
记得设置焦点,这样光标就会出现在RichTextBox中:
// 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);
//****SET FOCUS****
rtb.Focus();
// 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;
除了设置为“文档结束”,还可以使用设置caretPos向后/向前
和要移动的位移量:
int displacement = 8;
// Set the TextPointer 8 displacement backward.
caretPos = caretPos.GetPositionAtOffset(displacement, LogicalDirection.Backward);
例如,您可以将其粘贴到空窗口的构造函数中进行测试:
public RichTbxFlowDocumentTest()
{
InitializeComponent();
// 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);
//Add RichTextBox and Button with setting cursor method to a new StackPanel
StackPanel s = new StackPanel();
Button button = new Button() { Content = "Set Cursor Pos" };
button.Click += (sender, e) =>
{
//SET FOCUS
rtb.Focus();
// Get the current caret position.
TextPointer caretPos = rtb.CaretPosition;
//Set amount of displacement
int displacement = 6;
// Set the TextPointer 6 displacement backward
caretPos = caretPos.GetPositionAtOffset(displacement, LogicalDirection.Backward);
// Specify the new caret position to RichTextBox
rtb.CaretPosition = caretPos;
};
s.Children.Add(button);
s.Children.Add(rtb);
this.Content = s;
}
}
结果:
(我在中间移动窗口以防止后像)
其他补充资料: 如果要将RichTextBox插入符号上移或下移一行,可以看到 如何在WPF的RichTextBox中设置插入符号/光标位置 假设rtb
是RichTextBox的名称,使用不同的名称,可以通过以下方式设置文档开头的插入符号:
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:
Block blk = rtb.Document.Blocks.ElementAt(1);
可以将插入符号设置为其开始
rtb.CaretPosition = blk.ContentStart;
还是它的结束
rtb.CaretPosition = blk.ContentEnd;
或者如果您有一个特定的内联,例如
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,如果您正在处理从右到左和从左到右文本的复杂段落,您可能需要考虑
rtb.CaretPosition = blk.ElementStart;
rtb.CaretPosition = blk.ElementEnd;
还要注意在中实现的不同方法,您可以使用这些方法访问文档/块/内联线的不同部分:
rtb.CaretPosition = rtb.CaretPosition.GetLineStartPosition(0);
rtb.CaretPosition = rtb.CaretPosition.GetPositionAtOffset(2);
有关更多方法和更多信息,请参见链接
最后,您可能希望使用在块或内联中实现的BringIntoView
方法:
blk.BringIntoView();
r.BringIntoView();
以及设置键盘焦点,以查看插入符号的闪烁:
Keyboard.Focus(rtb);
Keyboard.Focus(rtb);