the renderering of mapcanvas is still active

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i am working with qgis c++ api 2.8.2 and qt4.8.5 i want to disable the rendering during zoom in or zoom out fonction in order to have a fast zoom i try to use :

MyMapCanvas->stopRendering(); and

MyMapCanvas->setRenderFlag(false); before the call of zoomIn ou zoomOut method but the renderer seems to be already active

how can i disable it before a zoomIn or zoomOut operation ?



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