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Question about the tutorial on Code Editor from QtProject

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  • K Offline
    K Offline
    kevina67
    wrote on 7 Aug 2013, 17:34 last edited by
    #1

    Hi folks,

    I read this tutorial on how to make a code editor based on a QPlainTextEdit : https://qt-project.org/doc/qt-4.8/widgets-codeeditor.html

    But I didn't get the roleplay of a variable :

    @void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
    {
    if (dy)
    lineNumberArea->scroll(0, dy);
    else
    lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());

     if (rect.contains(viewport()->rect()))
         updateLineNumberAreaWidth(0);
    

    }@

    What's the role of the "dy" variable ?
    I dont get it.

    Thanks in advance. ;)

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    • S Offline
      S Offline
      SGaist
      Lifetime Qt Champion
      wrote on 7 Aug 2013, 20:16 last edited by
      #2

      Hi,

      dy carries the amount of pixels the viewport was scrolled, see "QPlainTextEdit::updateRequest":https://qt-project.org/doc/qt-4.8/qplaintextedit.html#updateRequest

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      7 Aug 2013, 17:34

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