<![CDATA[Failed to change background color of table widget by QItemDelegate derived class]]>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.

]]>https://forum.qt.io/topic/80157/failed-to-change-background-color-of-table-widget-by-qitemdelegate-derived-classRSS for NodeThu, 24 Sep 2026 23:15:03 GMTSat, 10 Jun 2017 03:35:05 GMT60<![CDATA[Reply to Failed to change background color of table widget by QItemDelegate derived class on Mon, 12 Jun 2017 04:55:23 GMT]]>@Eddy Just don't know why QItemDelegate::drawBackground not work

]]>https://forum.qt.io/post/398864https://forum.qt.io/post/398864Mon, 12 Jun 2017 04:55:23 GMT<![CDATA[Reply to Failed to change background color of table widget by QItemDelegate derived class on Sun, 11 Jun 2017 15:42:46 GMT]]>@jronald
QStyledItemDelegate uses Qt::BackgroundRole

link to docs

]]>https://forum.qt.io/post/398798https://forum.qt.io/post/398798Sun, 11 Jun 2017 15:42:46 GMT<![CDATA[Reply to Failed to change background color of table widget by QItemDelegate derived class on Mon, 12 Jun 2017 04:40:23 GMT]]>@Eddy QStyledItemDelegate doesn't have a method of drawBackground

]]>https://forum.qt.io/post/398793https://forum.qt.io/post/398793Mon, 12 Jun 2017 04:40:23 GMT<![CDATA[Reply to Failed to change background color of table widget by QItemDelegate derived class on Sat, 10 Jun 2017 07:39:37 GMT]]>I see in your code you use
QItemDelegate
and
QStyleOptionViewItem

AFAIR they don't mix well.

Why are you not using QStyledItemDelegate?

]]>https://forum.qt.io/post/398624https://forum.qt.io/post/398624Sat, 10 Jun 2017 07:39:37 GMT<![CDATA[Reply to Failed to change background color of table widget by QItemDelegate derived class on Sat, 10 Jun 2017 07:07:01 GMT]]>@Eddy Already tried, no error is reported, just not work.

]]>https://forum.qt.io/post/398620https://forum.qt.io/post/398620Sat, 10 Jun 2017 07:07:01 GMT<![CDATA[Reply to Failed to change background color of table widget by QItemDelegate derived class on Sat, 10 Jun 2017 06:10:15 GMT]]>@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?

]]>https://forum.qt.io/post/398614https://forum.qt.io/post/398614Sat, 10 Jun 2017 06:10:15 GMT<![CDATA[Reply to Failed to change background color of table widget by QItemDelegate derived class on Sat, 10 Jun 2017 04:12:52 GMT]]>QPainter ::fillRect get it done, still confused why QItemDelegate ::drawBackground not work as expected.

]]>https://forum.qt.io/post/398611https://forum.qt.io/post/398611Sat, 10 Jun 2017 04:12:52 GMT