[PyQt] vertical alignment of richtext in a table view

[Mark Summerfield]

Hi Wolfgang,

On Sun, 5 Sep 2010 10:55:04 +0200
Wolfgang Rohdewald <wolfgang at rohdewald.de> wrote:
> Hi,
> 
> in Mark Summerfields book "Rapid GUI programming with Python
> and QT", there is an example on page 485 with a table column
> having a delegate that displays richtext. In the book,
> the text in this column has a vertical alignment in the middle
> of the cells, just like the other columns.
> 
> but if I execute that example (from the downloadable source:
> chap16/carhirelog.pyw), the rich text is vertically not 
> in the middle but above. How can I make it align vertically
> just like a normal column?
> 
> His book has another such table chap14, page 436 /
> ships_delegate.pyw.
> Here, both the image in the book and the executable show
> the same wrong vertical alignment.
> 
> BTW interesting things happen if the column with richtext
> is resized to a minimum: the delegate draws outside of its
> available horizontal space, showing text to the right of
> the rightmost column.

I'm tending to use a differnt approach for rich text delegates nowadays.
Instead of using a QTextDocument, I store a class-level QLabel,
something like this:

    # UNTESTED!
    def paint(self, painter, option, index):
	text = index.model().data(index, Qt.DisplayRole).toString()
	self.label.setText(text) # self.label is a QLabel with alignment
				 # etc. set up as one likes in the
				 # delegate's constructor
	# might want to change the label's palette here, depending on
	# the selection state
	self.label.setFixedSize(option.rect)
	self.label.render(painter)
	
Hope this helps:-)
 
> (using pyqt 4.7.3 with qt4-4.7.0-rc1)
> 
> this is the paint of the delegate:
> 
>     def paint(self, painter, option, index):
>         text = index.model().data(index, Qt.DisplayRole).toString()
>         palette = QApplication.palette()
>         document = QTextDocument()
>         document.setDefaultFont(option.font)
>         if option.state & QStyle.State_Selected:
>             document.setHtml(QString("<font color=%1>%2</font>") \
>                     .arg(palette.highlightedText().color().name()) \
>                     .arg(text))
>         else:
>             document.setHtml(text)
>         painter.save()
>         color = palette.highlight().color() \
>             if option.state & QStyle.State_Selected \
>             else QColor(index.model().data(index,
>                     Qt.BackgroundColorRole))
>         painter.fillRect(option.rect, color)
>         painter.translate(option.rect.x(), option.rect.y())
>         document.drawContents(painter)
>         painter.restore()
> 
> 



-- 
Mark Summerfield, Qtrac Ltd, www.qtrac.eu
    C++, Python, Qt, PyQt - training and consultancy
        "Rapid GUI Programming with Python and Qt" - ISBN 0132354187
            http://www.qtrac.eu/pyqtbook.html