How can i stop rendering Qgis

Question

In my python plugin ,i select features from a vector layer dynamically using a loop and executing : VectorLayer.select(feature.id())

when i start the loop, the selection become very slow because the rendering . can i suspend and reactivate rendering in qgis programatically in python.

Answer 1

Without seeing your code this is generally the wrong way to do this. You should use QgsVectorLayer::setSelectedFeatures to select features in one go.

ids = [feature.id() for feature in forselection]
layer.setSelectedFeatures(ids)

or with some long loop:

   ifs = []
   for feature in process:
       ..... #do some other stuff
       ids.append(feature.id())

   layer.setSelectedFeatures(ids)