[PyQt] Adding properties to a custom widget

Phil Thompson phil at riverbankcomputing.co.uk
Sun Sep 9 19:10:12 BST 2007

On Friday 07 September 2007, skawaii wrote:
> I've looked around and tried things for a couple of days now, but haven't
> been able to figure this out quite yet.
> I've created a custom widget in Qt Designer. It's working great and I'd
> like to be able to use this widget in future GUI's that I make (obviously).
> When in the "Edit Custom Widgets" dialog (Tools > Custom), I tried to add
> some properties that I'd like visible in Designer for future use. For
> example, a property called "precision" that is an int. Fantastic.
> I added my widget to a new dialog as a test. Compiled the ui file to
> python, which has the following line -
> self.fValuator2.setProperty("precision",QVariant(3)).
> However, when I run this test dialog (i.e. python test_dialog.py), I get
> the following error -
> QWidget::setProperty( "display_precision", value ) failed: property
> invalid, read-only or does not exist.
> So, it seems the adding the property in Designer does not equate to the
> property being created in my widget class. And this is where I hit a dead
> end. How do i create this property in my widget class? I looked at the
> http://doc.trolltech.com/3.3/properties.html Qt docs  on properties;
> however, I can't seem to figure out where the Q_PROPERTY macro is in PyQt
> 3.3.6 (upgrading to version 4.3 isn't an option for me, unfortunately).
> I've also found some material
> http://www.diotavelli.net/PyQtWiki/Using_Python_Custom_Widgets_in_Qt_Design
>er here , but it's again for PyQt 4.3 and doesn't seem that it'll work for
> me.
> Any suggestions out there? Thanks in advance.

Sorry, you're out of luck - you need PyQt4 for this.


More information about the PyQt mailing list