We received an interesting feature request in our support department: The ability to open the tab dialog when a user clicks a tab position in the TXTextControl.RulerBar class.

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In order to trap the double-click event in the RulerBar, the position needs to be calculated. In the MouseDoubleClick event, the position related to the document is calculated based on the scroll location and zoom factor.

Then the click location is compared to all tab positions at the current input position. If a tab position matches the click position within a range of 100 twips, the dialog is opened.

private void rulerBar1_MouseDoubleClick(object sender, MouseEventArgs e)
{
    // calculate zoom factor
    float fZoomFactor = (float)textControl1.ZoomFactor / 100;

    // get the click location in the ruler bar
    int iClickLocation = (int)((e.X * iDpiX) + (textControl1.ScrollLocation.X * fZoomFactor));

    // loop through all tab positions
    foreach (int tabPosition in textControl1.Paragraphs.GetItem(
        textControl1.Selection.Start).Format.TabPositions)
    {
        // retrieve the exact location including zoom factor
        int iTabLocation = (int)((tabPosition + 
            textControl1.Sections.GetItem().Format.PageMargins.Left) * fZoomFactor);

        // if click location matches tab position
        // open the tab dialog
        if (iClickLocation >= iTabLocation - 50 && iClickLocation <= iTabLocation + 50)
        {
            textControl1.TabDialog(); // open dialog
            break;
        }
    }
}

You can download the full sample from our GitHub repository.