def setItem(self, item):
assert item.backend == 'gdalbackend'
self.graphicsview.setUpdatesEnabled(False)
try:
self.reset()
try:
level = gdalsupport.ovrLevelForSize(item, self.OVRMAXSIZE)
# @NOTE: use GREATER for overview level to ensure an overview
# size smaller than OVRMAXSIZE
ovrindex = gdalsupport.ovrBestIndex(item, level, 'GREATER')
except gdalsupport.MissingOvrError:
logging.info('no overview available or available overviews '
'are too large')
return
scene = item.scene
self.graphicsview.setScene(scene)
self.graphicsview.setSceneRect(scene.sceneRect())
if not self.graphicsview.autoscale:
ovrlevel = gdalsupport.ovrLevels(item)[ovrindex]
matrix = QtCore.QMatirx(ovrlevel, 0, 0, ovrlevel, 0, 0)
self.graphicsview.setMatrix(matrix)
else:
self.graphicsview.fitInView()
self.updateMainViewBox()
finally:
self.graphicsview.setUpdatesEnabled(True)
self.graphicsview.update()
