pyqt delegate text wrapping sizeHint and paint

lukeQt · 8 Jan 2015, 22:13

Hi Everyone,

I have a sqlrelationaltablemodel and a subclassed delegate how do you get text wrapping to work? Can you please explain the sizeHint and the paint method?

This is what I have so far, but no matter how much text is in the cell I only see two lines. Why is that? What am I missing?

def sizeHint(self, option, index):
    """
    size hint is being used to control text wrap of the definition.
    All columns are allowed to text wrap, but only definition is
    believed to need text wrapping.
    """
    # set the sizeHint for all columns.
    if  index.isValid():
        fm = option.fontMetrics
        text = index.model().data(index)
        document = QtGui.QTextDocument()
        document.setDefaultFont(option.font)
        document.setPlainText(text.toString())

        # change cell Width, height (One can add or subtract to change
        # the relative dimension).
        #return QtCore.QSize(QtSql.QSqlRelationalDelegate.sizeHint(self, option, index).width() + 200,
        # QtSql.QSqlRelationalDelegate.sizeHint(self, option, index).height() +200)

        return QtCore.QSize(document.idealWidth(), QtSql.QSqlRelationalDelegate.sizeHint(self, option, index).height())

    # Else the index is not valid and then return the base method.
    else:
        return super(ObjDelegate, self).sizeHint(option, index)


def paint(self, painter, option, index):
    """
    This will allow for text wrapping. The paint method will paint the text.
    """
    if index.isValid():
        # This will highlight the selected cell.
        if option.state & QtGui.QStyle.State_Selected:
            painter.fillRect(option.rect, option.palette.highlight())

        # Get the text from the model.
        text = index.model().data(index)

        # Initialize the Qtextdocument.
        document = QtGui.QTextDocument()
        document.setPlainText(text.toString())
        document.setDefaultFont(option.font)

        # settextwidth.
        document.setTextWidth(option.rect.width())

        ctx = QtGui.QAbstractTextDocumentLayout.PaintContext()

        # Save the painter. Saves the current painter state.
        # This is so that we can redraw it later.
        painter.save()
        painter.translate(option.rect.topLeft())
        document.documentLayout().draw(painter, ctx)
        painter.restore()

    else:
        return super(ObjDelegate, self).paint(painter, option, index)