QTextDocument color

[bunjee]

Hey there.

I'm using a QTextDocument to display paragraphes.
Is there a way to set the "default" text color.

Thanks.

[bunjee]

QString style = "color: rgb(%1,%2,%3);";
mTextDocument->setDefaultStyleSheet(style.arg(mColor.red()).
						                  arg(mColor.green()).
						                  arg(mColor.blue()));

QString style = "color: rgb(%1,%2,%3);";
mTextDocument->setDefaultStyleSheet(style.arg(mColor.red()).
						                  arg(mColor.green()).
						                  arg(mColor.blue()));

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Tried this with no success.

[wysota]

Shouldn't it be QString("color: %1;").arg(mColor.name()) ?

[bunjee]

Should be working with rgb :/.

[wysota]

What do you do with the document afterwards? Maybe it's enough to set the color in the object (widget?) used as a container for the document?

[bunjee]

Actually it's not set in a widget,
I use the TextDocument for HTML strings that are displayed by my view's paint event.

[wysota]

Why don't you add the style definition to the html manually?

[bunjee]

I was thinking doing so. I was just checking that nobody had a better solution.

And beside I'm not a big fan of Html parsing .

[wysota]

You can also set a QTextFormat for each document block. Setting a pen with a colour of your choice on the painter in the paint event before painting might also help.

[bunjee]

Unfortunately, that didn't help,

I'm still trying to figure out how I can set a default color for a QTextDocument without erasing html tags and stuff like that.

Changing the pen in the paint event has no effect.
There's got to be some convenient way to do so.

[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.