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Thread: Custom Delegate and Text Wrap

  1. #1
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    Default Custom Delegate and Text Wrap

    Hi,

    I have a custom delegate that draws text and an image right beneath the text for each item in a QStandardItemModel like the attached screenshot. Screenshot.png

    As you can see, the text is covered by the image once it wraps because image location is fixed for each item. I could not figure out a way to query for the Y position of the text that will be painted after calling drawText() and set my image location accordingly. Google search and browse through this forum does not reveal any hint, please suggest how I could accomplish it.

    I have attached a simplified version of code to reproduce the behavior and thanks in advance for any reply!!
    textwrap.tar.bz2
    The current paint code looks like:
    Qt Code:
    1. void paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
    2. {
    3. QApplication::style()->drawPrimitive( QStyle::PE_PanelItemViewItem, &option, painter );
    4. painter->save();
    5. painter->translate(option.rect.topLeft());
    6.  
    7. const QRect line(0, 0, option.rect.width(), option.rect.height());
    8. painter->setClipRect(line);
    9.  
    10. if(option.state & QStyle::State_Selected) {
    11. painter->fillRect(option.rect, option.palette.color(QPalette::Highlight));
    12. }
    13.  
    14. QString txt = index.data(Qt::DisplayRole).toString();
    15. QRect r = QRect(PADDING, 0, option.rect.width() - PADDING, option.rect.height() - PADDING);
    16. r = painter->boundingRect(r, Qt::AlignLeft | Qt::AlignTop | Qt::TextWordWrap, txt);
    17. painter->drawText(r, Qt::AlignVCenter|Qt::AlignLeft|Qt::TextWordWrap, txt);
    18.  
    19. QImage ic = QImage(qvariant_cast<QImage>(index.data(Qt::DecorationRole)));
    20. r = QRect(0, PADDING*2, PIC_WIDTH, PIC_HEIGHT);
    21. painter->drawImage(r, ic);
    22. painter->restore();
    23. }
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  2. #2
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    Default Re: Custom Delegate and Text Wrap

    The QPainter::boundingRect() return value should tell you the actual size of the rectangle that the text will occupy. So the r.height() value should give you an idea where to put the top edge of the image.

  3. #3
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    Default Re: Custom Delegate and Text Wrap

    ...or you can use QFontMetrics::boundingRect(). Get it via option.fontMetrics.

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