WPF中RichTextBox中的光标位置

本文关键字：位置 光标 RichTextBox WPF | 更新日期: 2023-09-27 18:10:15

我正在开发一个小型WPF应用程序，其中有多个选项卡。我在底部有一个状态栏;要求显示游标的行数和列。因此，当用户更改光标位置时，linenumber和column必须自动更新。这里是我添加RichTextBox的代码;计算linenumber和列的代码在KeyDown事件处理程序中，但是这个事件永远不会被调用。我应该处理哪个事件来获得游标行数和列?

private void AddTabitem(string filePath, mode fileMode)
{
    if (fileMode == mode.openFile)
    {
        if (File.Exists(filePath))
        {
            RichTextBox mcRTB = new RichTextBox();
            mcRTB.KeyDown += new KeyEventHandler(LineNumber);
//rest of the code goes here
        }
    }
}
mcRTB.KeyDown += new KeyEventHandler(LineNumber);
private void LineNumber(object sender, KeyEventArgs e)
{          
    TextPointer tp1 = rtbList[EditorTabcontrol.SelectedIndex].Selection.Start.GetLineStartPosition(0);
    TextPointer tp2 = rtbList[EditorTabcontrol.SelectedIndex].Selection.Start;
    int column = tp1.GetOffsetToPosition(tp2);
    int someBigNumber = int.MaxValue;
    int lineMoved, currentLineNumber;
    rtbList[EditorTabcontrol.SelectedIndex].Selection.Start.GetLineStartPosition(-someBigNumber, out lineMoved);
    currentLineNumber = -lineMoved;
    string LineColumnLabel;
    //LineColumnLabel.Content = "Line: " + currentLineNumber.ToString() + " Column: " + column.ToString();
    LineColumnLabel = "Line: " + currentLineNumber.ToString() + " Column: " + column.ToString();        
}

WPF中RichTextBox中的光标位置

在MSDN (http://msdn.microsoft.com/en-us/library/system.windows.controls.richtextbox.caretposition%28v=vs.110%29.aspx)上有一个标准示例。请注意，在这种情况下，"游标"被称为"插入符号"。来自MSDN的示例如下:

// 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;

使用此代码查找行和位置

WPF 

  "<Label x:Name="LabellineNr" Content="line#" BorderThickness="1" BorderBrush="DarkGray" />
  "<Label x:Name="LabelColumnNr" Content="Column#" BorderThickness="1" BorderBrush="DarkGray"/>

c#代码
    private int privLineID = 1; 
    public int LineID
    {
        get { return privLineID; }
        set 
        { 
            privLineID = value;
            LabellineNr.Content = "Line: " + value;
        }
    }
    private int privColumnID = 1; 
    public int ColumnID
    {
        get { return privColumnID; }
        set 
        { 
            privColumnID = value;
            LabelColumnNr.Content = "Column: " + value;
        }
    }
    private int LineNumber()
    {
        TextPointer caretLineStart = RichTextControl.CaretPosition.GetLineStartPosition(0);
        TextPointer p = RichTextControl.Document.ContentStart.GetLineStartPosition(0);
        int currentLineNumber = 1;
        while (true)
        {
            if (caretLineStart.CompareTo(p) < 0)
            {
                break;
            }
            int result;
            p = p.GetLineStartPosition(1, out result);
            if (result == 0)
            {
                break;
            }
            currentLineNumber++;
        }
        return currentLineNumber;
    }
    private int ColumnNumber()
    {
        TextPointer caretPos = RichTextControl.CaretPosition;
        TextPointer p = RichTextControl.CaretPosition.GetLineStartPosition(0);
        int currentColumnNumber = Math.Max(p.GetOffsetToPosition(caretPos) - 1, 0);
        return currentColumnNumber;
    }
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