def addLayer(self, layer):
item = LayersItem(layer)
list_item = QListWidgetItem()
list_item.setSizeHint(item.sizeHint())
list_item.pos = layer.pos
new_pos = len(self.layers) - layer.pos
self.list.insertItem(new_pos, list_item)
self.list.setItemWidget(list_item, item)
self.layers.insert(new_pos, item)
self.list.setCurrentRow(new_pos)
self.image.current_layer = layer
