multiple fonts in one line of a QListWidget

问题

I need to include text and greek symbols (for simple mathematical equations) in the different options proposed by a QListWidget in a '.ui' file (I use to work with Qt Designer and I like python if it matters). I want the options to appear like this:

theta = phi^2 (toto et al.)
theta = phi^2.5 (tata et al.)
theta = 1-log(phi/2) (mister brown et al.)
...

with 'theta' and 'phi' replaced by their symbol. Strangely, this turns out to be not so simple...

How to define several fonts in one line of a QListWidget ? Same question with Qt Designer.

回答1:

A possible solution is to use HTML to generate the symbols of the equation, for example the following lines:

&theta;  = &phi;<sup>2</sup> (toto et al.)
&theta;  = &phi;<sup>2.5</sup> (tata et al.)
&theta;  = 1-log(&phi;/2) (mister brown et al.)

generate the following output:

θ = φ² (toto et al.)
θ = φ^2.5 (tata et al.)
θ = 1-log(φ/2) (mister brown et al.)

but QListWidget does not recognize this format, a solution for this is to create a delegate to recognize that format:

class HTMLDelegate(QtWidgets.QStyledItemDelegate):
    def paint(self, painter, option, index):
        self.initStyleOption(option,index)
        painter.save()
        doc = QtGui.QTextDocument()
        doc.setHtml(option.text)
        option.text = ""
        option.widget.style().drawControl(QtWidgets.QStyle.CE_ItemViewItem, option, painter)

        painter.translate(option.rect.left(), option.rect.top())
        clip = QtCore.QRectF(0, 0, option.rect.width(), option.rect.height())
        doc.drawContents(painter, clip)
        painter.restore()

    def sizeHint(self, option, index):
        self.initStyleOption(option,index)
        doc = QtGui.QTextDocument()
        doc.setHtml(option.text)
        doc.setTextWidth(option.rect.width())
        return QtCore.QSize(doc.idealWidth(), doc.size().height())

then we add him as a delegate with the following lines:

qlistwidget.setItemDelegate(HTMLDelegate())

Output:

The complete example can be found in the following link

来源：https://stackoverflow.com/questions/47890913/multiple-fonts-in-one-line-of-a-qlistwidget

标签

python

pyqt

pyqt5

qlistwidget