Hi All
I'm trying to find some good signals for identifying changes to data in a
memory layer.
I've got a functional memory provider plugin, at the moment saving each memory
layer to a GML file. However I'm not sure I've got the best approach to
identifying when data changes are made to memory layers so that I can identify
when the layers need to be updated.
The best I've got so far is
QObject.connect(layer, SIGNAL("committedAttributesDeleted(const
QString &, const QgsAttributeIds )"),self.setProjectDirty2)
QObject.connect(layer, SIGNAL("committedAttributesAdded(const
QString &, const QList<QgsField> &)"),self.setProjectDirty2)
QObject.connect(layer, SIGNAL("committedFeaturesDeleted(const
QString &, const QgsFeatureIds & )"),self.setProjectDirty2)
QObject.connect(layer, SIGNAL("committedFeaturesAdded(const QString
&, const QgsFeatureIds &)"),self.setProjectDirty2)
QObject.connect(layer,
SIGNAL("committedAttributeValuesChanges(const QString &, const
QgsChangedAttributesMap &)"),self.setProjectDirty2)
This works (at least for user changes - it won't identify changes made by other
plugins, for example). But it does seem a bit cumbersome.
I'd hoped find something directly from the provider, since this would also
identify programmatic data changes. I thought I was onto something when I saw
QgsDataProvider.dataChanged()
>From its name this seemed perfect, but the documentation states it is for a
>different purpose - asynchronous tasks registering completion of data changes
>:-( And looking through the memory provider code, I can't see any signals
>being emitted.
I'd also thought that using QgsVectorLayer.layerModified(bool) might have been
a bit more succinct. But that gets triggered more often than I want.
Is there any obvious signal I'm missing?
Thanks
Chris
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