[Qgis-developer] currentLayerChanged signal

[motta.luiz at gmail.com]

Michele,

a) See the signals in Mapcanvas API
http://doc.qgis.org/head/classQgsMapCanvas.html
layersChanged ()


b) May be you need the theses SIGNALS:
layerWillBeRemoved(QString)
layerWasAdded(QgsMapLayer *)
See in http://doc.qgis.org/head/classQgsMapLayerRegistry.html


Example in tools (plugin downloads):
a) C:\Documents and 
Settings\lmotta\.qgis\python\plugins\GdalTools\tools\doTranslate.py
self.connect(self.canvas, SIGNAL("layersChanged()"), 
self.fillInputLayerCombo)


b) C:\Documents and 
Settings\lmotta\.qgis\python\plugins\imgshowhide\imgshowhidewidget.py
QtCore.QObject.connect(core.QgsMapLayerRegistry.instance(), 
QtCore.SIGNAL("layerWillBeRemoved(QString)"), self.__removeLayer)
QtCore.QObject.connect(core.QgsMapLayerRegistry.instance(), 
QtCore.SIGNAL("layerWasAdded(QgsMapLayer *)"), self.__addLayer)


Michele Mammini escreveu:
> Dear all,
>
> in my python plugin i have to catch the currentLayerChanged to 
> enabled/disable a button in the toolbar, but i don't know where and 
> how write the signal connect to it.
> I suppose that the signal must be write in the main plugin file...
>
> May someone can suggest me the correct procedure?
>
> Thanks, Michele.
>
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