Failed to change background color of table widget by QItemDelegate derived class

[jronald]

void MyTableItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QStyleOptionViewItem myOption = option;
    // not work
    myOption.palette.setColor(QPalette::All, QPalette::Background, Qt::red);
    drawBackground(painter, myOption, index);
    // works
    myOption.palette.setColor(QPalette::All, QPalette::Text, Qt::red);
    drawDisplay(painter, myOption, myOption.rect, "Hello");
}

The text color can be changed, but the background color can't be changed.
How to change the background color? (Better in the paint function.)
Thanks.

[jronald]

QPainter ::fillRect get it done, still confused why QItemDelegate ::drawBackground not work as expected.

[Eddy]

@jronald

instead of QPalette::All which doesn't exist in enum QPalette::ColorGroup
you can choose between :

QPalette::Disabled		 
QPalette::Active		 
QPalette::Inactive		 
QPalette::Normal

what errors did you get?

[jronald]

@Eddy Already tried, no error is reported, just not work.

[Eddy]

I see in your code you use
QItemDelegate
and
QStyleOptionViewItem

AFAIR they don't mix well.

Why are you not using QStyledItemDelegate?

[jronald]

@Eddy QStyledItemDelegate doesn't have a method of drawBackground

[Eddy]

@jronald
QStyledItemDelegate uses Qt::BackgroundRole

link to docs

[jronald]

@Eddy Just don't know why QItemDelegate::drawBackground not work