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Force Content Update QPlainTextEdit

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  • B Offline
    B Offline
    brlebtag
    wrote on last edited by
    #1

    I am trying to implement a Code editor. And I trying to implement Line Numbers but with the ability to turn on/off line numbers. I took http://qt-project.org/doc/qt-4.8/widgets-codeeditor.html as initial base...

    I added a bool lineNumber and wrapped updateLineNumberArea() and lineNumberAreaPaintEvent() with a if(lineNumber) and altered lineNumberAreaWidth() to return 0 if(lineNumber)

    So I tried to repaint(), update(), resize()... but i did't update the QPlainTextEdit, it did updated only when i typed enter...

    Any idea? I am newbie

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    • raven-worxR Offline
      raven-worxR Offline
      raven-worx
      Moderators
      wrote on last edited by
      #2

      [quote author="brlebtag" date="1390397731"]
      I added a bool lineNumber and wrapped updateLineNumberArea() and lineNumberAreaPaintEvent() with a if(lineNumber) and altered lineNumberAreaWidth() to return 0 if(lineNumber)[/quote]
      sorry, but this is not understandable.
      Please just post some code of this method.

      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
      If you have a question please use the forum so others can benefit from the solution in the future

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      • B Offline
        B Offline
        brlebtag
        wrote on last edited by
        #3

        sorry...

        @
        int CodeEditor::lineNumberAreaWidth()
        {
        int digits = 1;
        int max = qMax(1, blockCount());
        while (max >= 10) {
        max /= 10;
        ++digits;
        }
        int space = 10 + fontMetrics().width(QLatin1Char('9')) * digits;

        if(!CodeEditor::line_number)
            space = 0;
        
        return space;
        

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

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

        }

        void CodeEditor::resizeEvent(QResizeEvent *e)
        {
        if(CodeEditor::line_number)
        {
        QPlainTextEdit::resizeEvent(e);

            QRect cr = contentsRect();
            lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
        }
        

        }

        void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
        {
        if(CodeEditor::line_number)
        {
        QPainter painter(lineNumberArea);
        painter.fillRect(event->rect(), Qt::lightGray);

            QTextBlock block = firstVisibleBlock();
            int blockNumber = block.blockNumber();
            int top = (int) blockBoundingGeometry(block).translated(contentOffset()).top();
            int bottom = top + (int) blockBoundingRect(block).height();
        
            while (block.isValid() && top <= event->rect().bottom())
            {
                if (block.isVisible() && bottom >= event->rect().top())
                {
                    QString number = QString::number(blockNumber + 1);
                    painter.setPen(Qt::black);
                    painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(),
                                     Qt::AlignRight, number);
                }
        
                block = block.next();
                top = bottom;
                bottom = top + (int) blockBoundingRect(block).height();
                ++blockNumber;
            }
        }@
        

        I just added a if(CodeEditor::line_number)

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