[Qgis-developer] currentLayerChanged signal

[motta.luiz at gmail.com]

Michele,

The legend in QGIS will  change for make the QgsLegendInterface.
In the moment, we can't catch signal easily.
See this thread, where i needed work with legend:
http://n2.nabble.com/List-layer-from-Legend-td4416161.html


Michele Mammini escreveu:
> My problem is to catch the signal when the user change the selection 
> of a layer in the legend.
> The signal you suggest are only for adding/removing layer.
>
> At moment i'm using the Kore version (1.0.2) of QGis.
>
> Michele.
>
> At 13:25 19/02/2010, motta.luiz at gmail.com wrote:
>> 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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>