QTextDocument color

[StSav012]

A QTextDocument is never alone. You ought to draw it in a paint function. There, you pass a context parameter. The latter might be just a QAbstractTextDocumentLayout.PaintContext(). It has a palette attribute. There, you set the brush.

That's how it might look like:

class StyledItemDelegate(QStyledItemDelegate):
    def paint(
            self,
            painter: QPainter,
            option: QStyleOptionViewItem,
            index: QModelIndex | QPersistentModelIndex,
    ) -> None:
        self.initStyleOption(option, index)
        style: QStyle
        if option.widget:
            style = option.widget.style()
        else:
            style = QApplication.style()
        doc: QTextDocument = QTextDocument()
        doc.setHtml(option.text)
        option.text = ""
        style.drawControl(QStyle.ControlElement.CE_ItemViewItem, option, painter)
        ctx: QAbstractTextDocumentLayout.PaintContext = QAbstractTextDocumentLayout.PaintContext()
        text_rect: QRect = style.subElementRect(QStyle.SubElement.SE_ItemViewItemText, option)
        painter.save()
 
        if option.state & QStyle.StateFlag.State_Selected:
            ctx.palette.setBrush(QPalette.ColorRole.Text, option.palette.highlightedText())
 
        painter.translate(text_rect.topLeft())
        painter.setClipRect(option.rect.translated(-text_rect.topLeft()))
        painter.translate(0, 0.5 * (option.rect.height() - doc.size().height()))
        doc.documentLayout().draw(painter, ctx)
        painter.restore()

class StyledItemDelegate(QStyledItemDelegate):
    def paint(
            self,
            painter: QPainter,
            option: QStyleOptionViewItem,
            index: QModelIndex | QPersistentModelIndex,
    ) -> None:
        self.initStyleOption(option, index)
        style: QStyle
        if option.widget:
            style = option.widget.style()
        else:
            style = QApplication.style()
        doc: QTextDocument = QTextDocument()
        doc.setHtml(option.text)
        option.text = ""
        style.drawControl(QStyle.ControlElement.CE_ItemViewItem, option, painter)
        ctx: QAbstractTextDocumentLayout.PaintContext = QAbstractTextDocumentLayout.PaintContext()
        text_rect: QRect = style.subElementRect(QStyle.SubElement.SE_ItemViewItemText, option)
        painter.save()

        if option.state & QStyle.StateFlag.State_Selected:
            ctx.palette.setBrush(QPalette.ColorRole.Text, option.palette.highlightedText())

        painter.translate(text_rect.topLeft())
        painter.setClipRect(option.rect.translated(-text_rect.topLeft()))
        painter.translate(0, 0.5 * (option.rect.height() - doc.size().height()))
        doc.documentLayout().draw(painter, ctx)
        painter.restore()

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Punctual as always, me.