富文本框将行号转换为滚动条位置

本文关键字：转换 滚动条 位置 文本 | 更新日期: 2024-09-27 09:56:28

我现在可以使用以下代码同步我的两个RichTextBox：

private const int SB_HORZ = 0x0;
private const int SB_VERT = 0x1;
private const int WM_HSCROLL = 0x114;
private const int WM_VSCROLL = 0x115;
private const int SB_THUMBPOSITION = 4;
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int GetScrollPos(int hWnd, int nBar);
[DllImport("user32.dll")]
private static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);
[DllImport("user32.dll")]
private static extern bool PostMessageA(IntPtr hWnd, int nBar, int wParam, int lParam);
internal int HScrollPos
{
    private get { return GetScrollPos((int)this.Handle, SB_HORZ); }
    set
    {
        SetScrollPos((IntPtr)this.Handle, SB_HORZ, value, true);
        PostMessageA((IntPtr)this.Handle, WM_HSCROLL, SB_THUMBPOSITION + 0x10000 * value, 0);
    }
}
internal int VScrollPos
{
    get { return GetScrollPos((int)this.Handle, SB_VERT); }
    set
    {
        SetScrollPos((IntPtr)this.Handle, SB_VERT, value, true);
        PostMessageA((IntPtr)this.Handle, WM_VSCROLL, SB_THUMBPOSITION + 0x10000 * value, 0);
    }
}

我可以同步RichTextBoxes，同时键关闭，打开和Vscroll事件。确实这不是我的目标，我想根据内容同步我的RichTextBoxes，我需要什么：

  • 获取当前行窗体未选中RichTextBox。
  • 使用其他RichTextBox中的行号设置滚动条位置(不会丢失当前焦点(。
  • 使用滚动条位置获取行号。

注意：欢迎您询问是否需要更多详细信息。
提前谢谢。

富文本框将行号转换为滚动条位置

据

我了解，您需要根据行号在 2 个RichTextBox上同步滚动。如果我误解了，请给我留言。

RichTextBox扩展 ：

public class RichTextBoxEx : RichTextBox
{
    // combination of multiple events that may cause focus(caret) to change
    public event EventHandler FocusChanged;
    public RichTextBoxEx()
    {
        this.KeyPress += (s, e) => RaiseFocusChanged();
        this.KeyDown += (s, e) => RaiseFocusChanged();
        this.KeyUp += (s, e) => RaiseFocusChanged();
        this.MouseClick += (s, e) => RaiseFocusChanged();
    }
    private void RaiseFocusChanged()
    {
        var focusChanged = FocusChanged;
        if (focusChanged != null)
        {
            focusChanged(this, null);
        }
    }
    public int GetFirstSelectedLine()
    {
        var index = GetFirstCharIndexOfCurrentLine();
        return GetLineFromCharIndex(index);
    }
    public int GetFirstVisibleLine()
    {
        var index = GetCharIndexFromPosition(new Point(1, 1));
        return GetLineFromCharIndex(index);
    }
    public void ScrollToLine(int line)
    {
        if (line < 0)
            throw new ArgumentOutOfRangeException("line cannot be less than 0");
        // save the current selection to be restored later
        var selection = new { SelectionStart, SelectionLength };
        // select that line and scroll it to
        Select(GetFirstCharIndexFromLine(line) + 1, 0);
        ScrollToCaret();
        // restore selection
        Select(selection.SelectionStart, selection.SelectionLength);
    }
}

用法：

void Main()
{
    var mainScreenArea = Screen.PrimaryScreen.WorkingArea;
    var rich1 = new RichTextBoxEx() { Width = mainScreenArea.Width / 2 - 10, Dock = DockStyle.Left };
    var rich2 = new RichTextBoxEx() { Width = mainScreenArea.Width / 2 - 10, Dock = DockStyle.Right };
    rich1.LoadFile(__RTF_FILE_0__);
    rich2.LoadFile(__RTF_FILE_1__);
    // pick one :
    // synchronize by focus
    rich1.FocusChanged += (s, e) => rich2.ScrollToLine(rich1.GetFirstSelectedLine());
    // synchronize by viewbox
    // rich1.VScroll += (s, e) => rich2.ScrollToLine(rich1.GetFirstVisibleLine());
    var form = new Form();
    form.Controls.Add(rich1);
    form.Controls.Add(rich2);
    form.WindowState = FormWindowState.Maximized;
    form.ShowDialog()
}
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