Selection color for progressbar in treeview

[Jennie Bystrom]

I have a treeview where some items contain a progressbar. This I fixed by subclassing QStyledItemDelegate and re-implementing the paint method. This works well and looks good.

I do have a problem and that is that when I select a row in the tree, the cell containing the progress-bar doesn't change its background color to the selection color. The background color stays the same as the non-selected rows which makes it look very weird.

This is my paint-method in the delegate:

void ResourceTreeDelegate::paint(QPainter *painter,
				 const QStyleOptionViewItem& option,
				 const QModelIndex& index) const
{
  int column = index.column();
  if (column == ResourceTreeModel::Progress) {
 
    painter->save();      
 
    if (index.data().isNull()) {
      QStyledItemDelegate::paint(painter, option, index);
    }
    else {
      QColor backgroundColor = qvariant_cast<QColor>(index.data(Qt::BackgroundColorRole));
      QColor highlightColor = option.palette.color(QPalette::Highlight);
 
      int value = index.data().toInt();
      if (value < 0) value = 0;
      int x = option.rect.x();
      int y = option.rect.y();
      int width = option.rect.width();
      int height = option.rect.height();
 
      // make with margins
      int margin = ResourceTreeDelegateConstants::PROGRESS_BAR_MARGIN;
      int progressBarHeight = ResourceTreeDelegateConstants::PROGRESS_BAR_HEIGHT;
      QRect newRect(x + margin,
		    y + (int)(height / 2.0) - 7,
		    width - (2 * margin),
		    progressBarHeight);
 
      QStyleOptionProgressBar progressBarOption;
      progressBarOption.palette.setColor(QPalette::Window, backgroundColor);
      progressBarOption.palette.setColor(QPalette::Highlight, highlightColor);
      progressBarOption.rect = newRect;
      progressBarOption.minimum = 0;
      progressBarOption.maximum = 100;
      progressBarOption.progress = value;
      progressBarOption.text = QString("  %1%").arg(QString::number(value)).leftJustified(7, ' ');
      progressBarOption.textVisible = true;
 
      painter->fillRect(option.rect, progressBarOption.palette.background());    
      QApplication::style()->drawControl(QStyle::CE_ProgressBar,
					 &progressBarOption, painter);
    }
 
    if (index.isValid()) {
      painter->setPen(Qt::lightGray);
      painter->drawRect(option.rect);
    }
 
    painter->restore();
  }
 
  QStyledItemDelegate::paint(painter, option, index);
}

void ResourceTreeDelegate::paint(QPainter *painter,
				 const QStyleOptionViewItem& option,
				 const QModelIndex& index) const
{
  int column = index.column();
  if (column == ResourceTreeModel::Progress) {

    painter->save();      

    if (index.data().isNull()) {
      QStyledItemDelegate::paint(painter, option, index);
    }
    else {
      QColor backgroundColor = qvariant_cast<QColor>(index.data(Qt::BackgroundColorRole));
      QColor highlightColor = option.palette.color(QPalette::Highlight);

      int value = index.data().toInt();
      if (value < 0) value = 0;
      int x = option.rect.x();
      int y = option.rect.y();
      int width = option.rect.width();
      int height = option.rect.height();
      
      // make with margins
      int margin = ResourceTreeDelegateConstants::PROGRESS_BAR_MARGIN;
      int progressBarHeight = ResourceTreeDelegateConstants::PROGRESS_BAR_HEIGHT;
      QRect newRect(x + margin,
		    y + (int)(height / 2.0) - 7,
		    width - (2 * margin),
		    progressBarHeight);
      
      QStyleOptionProgressBar progressBarOption;
      progressBarOption.palette.setColor(QPalette::Window, backgroundColor);
      progressBarOption.palette.setColor(QPalette::Highlight, highlightColor);
      progressBarOption.rect = newRect;
      progressBarOption.minimum = 0;
      progressBarOption.maximum = 100;
      progressBarOption.progress = value;
      progressBarOption.text = QString("  %1%").arg(QString::number(value)).leftJustified(7, ' ');
      progressBarOption.textVisible = true;
      
      painter->fillRect(option.rect, progressBarOption.palette.background());    
      QApplication::style()->drawControl(QStyle::CE_ProgressBar,
					 &progressBarOption, painter);
    }

    if (index.isValid()) {
      painter->setPen(Qt::lightGray);
      painter->drawRect(option.rect);
    }
    
    painter->restore();
  }

  QStyledItemDelegate::paint(painter, option, index);
}

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How can I tell the progressbar to change its background when rows are selected in the tree?

[norobro]

You need to check for the selected state. Something like this should work:

if(option.state & QStyle::State_Selected){
// set selected colors - QPalette::Highlight & QPalette::HighlightedText
}
else {
// set unselected colors if necessary - QPalette::Window & QPalette::Text
}

if(option.state & QStyle::State_Selected){
// set selected colors - QPalette::Highlight & QPalette::HighlightedText
}
else {
// set unselected colors if necessary - QPalette::Window & QPalette::Text
}

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