def scene_selection_changed(self):
"""scene.selectionChanged slot
"""
# TODO LH Fix dreadful performance when selection changing as a result
# of mouse drag
if not self.handling_selection_update:
debug_print('GraphicsItemView.scene_selection_changed')
# TODO Context for this
self.handling_selection_update = True
try:
new_selection = set(self.rows_of_items(self.scene.selectedItems()))
update_selection_model(self.model(), self.selectionModel(),
new_selection)
finally:
self.handling_selection_update = False
def _slider_changed(self, value):
"""QSlider.valueChanged slot
"""
debug_print('SelectorView._slider_changed', value)
if False and 0 == value:
# Do not alter selection if value is 0
pass
else:
# Order items by increasing / decreasing area and select the first n
model = self.model()
rows = range(model.rowCount())
def box_area(row):
rect = model.index(row, 0).data(RectRole)
return rect.width() * rect.height()
rows = sorted(rows, key=box_area, reverse=value < 0)
self._updating_selection = True
try:
update_selection_model(model, self.selectionModel(), rows[:abs(value)])
finally:
self._updating_selection = False
def _slider_changed(self, value):
"""QSlider.valueChanged slot
"""
debug_print('SelectorView._slider_changed', value)
if False and 0 == value:
# Do not alter selection if value is 0
pass
else:
# Order items by increasing / decreasing area and select the first n
model = self.model()
rows = range(model.rowCount())
def box_area(row):
rect = model.index(row, 0).data(RectRole)
return rect.width() * rect.height()
rows = sorted(rows, key=box_area, reverse=value < 0)
self._updating_selection = True
try:
update_selection_model(model, self.selectionModel(),
rows[:abs(value)])
finally:
self._updating_selection = False
