[PyQt] HeightForWidth label

[Mads Ipsen]

Dear Pete,

Thanks a lot for your input. To some extend its too bad that this 
feature cannot be implemented in a proper fashion - especially when the 
documentation of Qt tells you that it can.

Best regards,

Mads

On 09/01/2013 22:00, Hans-Peter Jansen wrote:
> Dear Mads,
>
> Am Mittwoch, 9. Januar 2013, 15:56:29 schrieb Mads Ipsen:
>> Hi,
>>
>> 4-5 years I needed a widget with the following properties:
>>
>>    * Display text incl. HTML
>>    * Text should be wrapped on several lines
>>    * When the widget is put into a layout, the height of the widget
>>      should be adjusted in such a way that the text exactly fits the
>>      widget geometry
>>
>> This subwidget should be used in a layout to provide some detail on how
>> the other GUI elements in the layout work but only consume a minimum
>> space to display its content.
>>
>> I thought this was an easy one - but each time I return to the challenge
>> I always end by giving up.
>>
>> The main problem is that the layout breaks down when heightForWidth() is
>> implemented and a QSizePolicy with setHeightForWidth(True) is used. It
>> can shrink to infinitely small. Apparently this is Qt bug.
> Yes, been there, done that, and failed in similar ways.
>
> The best thing I could come up on this was:
>
> use a QTextBrowser for the text:
>
>          self.aboutText.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
>          self.aboutText.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
>          self.aboutText.setLineWrapMode(QtGui.QTextEdit.NoWrap)
>          self.aboutText.setSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
>          self.aboutText.setHtml("...")
>
>          w = self.aboutText.document().idealWidth()
>          self.aboutText.document().setTextWidth(w)
>          ds = self.aboutText.document().size()
>          self.aboutText.setMinimumSize(int(ds.width() + 3), int(ds.height() + 3))
>          self.aboutText.updateGeometry()
>          self.layout().setSizeConstraint(QtGui.QLayout.SetFixedSize)
>
> with this, you can even provide clickable links (but disable openLinks prop):
>
>      @QtCore.pyqtSignature("const QUrl &")
>      def on_aboutText_anchorClicked(self, url):
>          QtGui.QDesktopServices.openUrl(url)
>
> Maybe it gets you going..
>
> Cheers,
> Pete
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