[PyQt] observing attributes in dip

[Phil Thompson]

On Wed, 13 Jul 2011 11:32:11 -0400, Lic. José M. Rodriguez Bacallao
<jmrbcu at gmail.com> wrote:
> why this doesn't work?
> 
> --------- i_widget.py ---------
> 
> # dip imports
> from dip.model import Str, Instance
> 
> # PyQt4 imports
> from PyQt4 import QtGui
> 
> # imagis imports
> from i_action_container import IActionContainer
> 
> class IWidget(IActionContainer):
> 
>     # the identifier of the widget
>     id = Str()
> 
>     # the name of the widget
>     name = Str()
> 
>     # The PyQt4.QtGui.QWidget instance that implements the widget.
>     widget = Instance(QtGui.QWidget)
> 
>     # The parent of the internal widget.
>     parent = Instance(QtGui.QWidget)
> 
> ----- widget.py --------
> 
> # dip imports
> from dip.model import Model, implements, observe
> 
> # imagis imports
> from i_widget import IWidget
> import PyQt4
> 
> @implements(IWidget)
> class Widget(Model):
>     """ Base class for all ui widgets that can manage an internal
>     PyQt4.QtCore.QWidget.
>     """
> 
>     @observe('IWidget.name')
>     def name(self, c):
>         print 'changing: ', c.new
> 
> 
>     @IWidget.widget.default
>     def widget(self):
>         return QtGui.QWidget()
> 
> if __name__ == '__main__':
>     from dip.model import Instance, Str
>     from PyQt4 import QtGui
> 
>     class W(Widget):
> 
>         id = 'example.id'
>         name = Str('text')
> 
>     app = QtGui.QApplication([])
>     w = W()
>     w.name = 'xxx'
>     w.widget.show()
>     app.exec_()
> 
> the observer is never called

Either use...

    @observe('IWidget.name')
    def some_other_name(self, c):

...or (my preference)...

    @IWidget.name.observer
    def name(self, c):

Phil