[Qgis-developer] addMapLayer and position in the stack

[motta.luiz at gmail.com]

Michele,

You need define QgsMapCanvasLayer, after use QgsMapCanvas::setLayerSet  
with list of layers.

I make this for in my plugin "Image show or hide" (user-contributed  in 
"http://www.pyqgis.org/" )

Obs: when change the order layer set (QgsMapCanvas::setLayerSet) the 
legend continue with old oder.

The code below add layer (Raster Layer, use for setNoDataValue) in 
bottom stack (copied by plugin)

  def __getListCanvasLayer(self):
    # Return : List of QgsMapCanvasLayer with change visible toggle layer
    # dicLyrs -> Key = LayerId , Value = Layer
    dicLyrs = core.QgsMapLayerRegistry.instance().mapLayers()
    # List of layers in legend
    lstLyrIdLegend = self.__mapCanvas.mapRenderer().layerSet()
    lstReturn = []
    for lyrId, lyr in dicLyrs.iteritems():
      isVisible = True
      if lstLyrIdLegend.indexOf(lyrId) == -1:
        isVisible = False
      lstReturn.append(gui.QgsMapCanvasLayer(lyr, isVisible))
    return lstReturn

  def __addImgLastPosition(self, lyr):
    lyr.setNoDataValue(0)
    lstMapCanLyr = self.__getListCanvasLayer()
    core.QgsMapLayerRegistry.instance().addMapLayer(lyr);
    lstMapCanLyr.append(gui.QgsMapCanvasLayer(lyr, True))
    self.__mapCanvas.setLayerSet(lstMapCanLyr)

Best Regards,
Luiz Motta

Michele Mammini escreveu:
> Dear All,
>
> when you add a layer with the command addMapLayer, this layer is 
> loaded at the top of the stack.
> is it possible to set the position of the layer we want to load?
> is it possible to load it at the bottom of the stack?
>
> Do someone know how to solve it?
>
> Thank you Michele.
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