I am (whimsically) trying to draw a background image in a QTreeWidget. I have
this simple code working in a QTreeWidget subclass:
SeatTree::SeatTree(const QString& prefix, QWidget *parent)
: QTreeWidget(parent)
{
server_image = QPixmap(QString(":/images/%1_Server.png").arg(prefix));
image_dimensions.setX(server_image.width());
image_dimensions.setY(server_image.height());
QPalette pal = viewport()->palette();
pal.setColor(QPalette::Base, Qt::transparent);
viewport()->setPalette(pal);
}
void SeatTree::paintEvent(QPaintEvent *event)
{
QPainter painter(viewport());
painter.fillRect(event->rect(), palette().base());
// added this predicate to prevent the image from being drawn
// in the confines of row
if(event->rect().width() >= image_dimensions.x() &&
event->rect().height() >= image_dimensions.y())
{
int left = event->rect().width() - server_image.width();
int top = event->rect().height() - server_image.height();
painter.drawPixmap(left, top, server_image);
}
painter.end();
QTreeWidget::paintEvent(event);
event->accept();
}
And this draws the image exactly as I expect it to. However, the rows of the
Tree damage the background image in various scenarios, and it does not get
corrected unless the entire Tree gets re-drawn.
Do I need to move this action into another painting function, e.g. the
drawTree() method of a QTreeView, to get it to show without being damaged? Or
can I do this with some additional acrobatics in the QTreeWidget paintEvent()?
Thanks for any insights.
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