I would like to have the signal when the color of a vector layer is changed by the user. In the doc, there is a signal that seems to fit (http://qgis.org/api/classQgsVectorLayer.html#a403f235d3743aa59bb3aad69a72a5705) but nothing happens when it is called.

I have a method called rendererChanged: QObject.connect(self.iface.activeLayer(), SIGNAL("rendererChanged()"), self.DoSomething)

When executed, my function DoSomething is not executed.

I have also tried : self.iface.activeLayer().rendererChanged.connect(self.toto)

But I get this error : AttributeError: 'QgsVectorLayer' object has no attribute 'rendererChanged'

1 Answer 1


You have to use a Canvas-Object as first agrument in QObject.connect(). This snippset works for me:

def _onRenderComplete():
    print("do something")

_canvas = qgis.utils.iface.mapCanvas()
QObject.connect(_canvas, SIGNAL("renderComplete(QPainter *)"), _onRenderComplete)
  • Or the more recent method of connecting signals and slots: iface.mapCanvas().renderComplete.connect(_onRenderComplete)
    – Joseph
    Commented Aug 21, 2017 at 11:45

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