Tables

Lingfa Yang
Our TableWidget is a subclass of QTableWidget. Beyond the standard table display facilities for applications, our TableWidget accepts html-format table or tabbed plain text as two convenient inputs.

  1. Standard html table format:

    <table>...</table> - define a table
<th> - headers
<tr> - row
<td> - column
    Here is an example. Our TableWidget rendered as this:
    Mozilla browser rendered as this:

  2. Tabbed plain text format

    If you are lazy to write these tags, you can choose plain text format, where use tab-key for next column and line-break for next row. Our TableWidget will give the same rendering result. 
    bool TableWidget::setTabText(const QString &text)
{
    QStringList li(text.split("\n"));
    int rows = li.size();
    int cols = li[0].split("\t", QString::SkipEmptyParts).size();
    this->setColumnCount(cols);
    this->setRowCount(rows);

    QTableWidgetItem *item;
    for(int row=0; row<rows; row ++)
    {
       QStringList lineTxt = li[row].split("\t",QString::SkipEmptyParts);
       for(int col=0; col<cols; col++)
       {
          item = new QTableWidgetItem;
          item->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);
          this->setItem(row, col, item);

          if(col < lineTxt.size()) // have text provided
              this->item(row, col)->setText(lineTxt[col]);
       }
    }
    return true;
}

  3. How to access Left-top Corner widget?

    This is a challenge question if you want to put a text string to the left-top corner. Qt has no simple solution. Use even filter it can be done this ugly way: 
    bool TableWidget::eventFilter(QObject* o, QEvent* e)
{
    if (e->type() == QEvent::Paint)
    {
        QAbstractButton* btn = qobject_cast<QAbstractButton*>(o);
        if (btn)
        {
           // self paint
           QStyleOptionHeader opt;
           opt.init(btn);
           QStyle::State state = QStyle::State_None;
           if (btn->isEnabled())
                   state |= QStyle::State_Enabled;
           if (btn->isActiveWindow())
                   state |= QStyle::State_Active;
           if (btn->isDown())
                   state |= QStyle::State_Sunken;
           opt.state = state;
           opt.rect = btn->rect();
           opt.text = btn->text(); // !!!
           opt.position = QStyleOptionHeader::OnlyOneSection;
           QStylePainter painter(btn);
           painter.drawControl(QStyle::CE_Header, opt);
           return true; // eat event
        }
    }
    return false;
}

  4. ActiveX table embedding

    Want embedding table widget into Office documents or IE-browsed web pages? We can use QAxFactory, turn the table widget into an activeX control.

    A demo shows an active table in PowerPoint 2007 which has persist data


    A demo shows an active table in IE.
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