[PySide] can a QStandardItem emit a signal?

[Ch'Gans]

Only QObjects can emit signals.
If you want to get notification when the selected item(s) changes, then you
need to connect to the view's selection model:
http://doc.qt.io/qt-5/qabstractitemview.html#selectionModel

I don't see any reason why C++ should be different from python on this
topic.

Chris


On 4 August 2016 at 16:31, Frank Rueter | OHUfx <frank at ohufx.com> wrote:

> Hi,
>
> I am writing a custom view for a simple data model and need to have a
> custom widget change it's background colour when it's associated
> QStandardItem has a certain attribute.
> I thought I'd simply subclass QStandardItem, give it the custom attribute,
> e.g. isSelected, then a method called setSelected() which sets the
> attribute's value and emits a selectionChanged signal, to which I can
> connect the associated widget's slot that changes the background colour.
> So this is what I have for the item:
>
> class ElemItem(QtGui.QStandardItem):
>     selectionChanged = QtCore.Signal(bool)
>
>     def __init__(self, elementData):
>         super(ElemItem, self).__init__(elementData)
>         self.isSelected = False
>         self.filePath = elementData
>
>     def setSelected(self, selected):
>         self.isSelected = selected
>         selectionChanged.emit(selected)
>
>
> However, since QStandardItem doesn't inherit QObject it doesn't seem to be
> able to emit a signal. When I try something like this in the widget:
>     self.item.selectionChanged.connect(self.markAsSelected)
>
> I get this error:
>     AttributeError: 'PySide.QtCore.Signal' object has no attribute
> 'connect'
>
>
> Is this the entirely wrong way of achieving what I'm after?
> I can achieve what I'm after in other ways but would like to understand
> this hiccup before moving on, so any input would be welcome.
>
> Cheers,
> frank
>
>
>
> --
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