recycleview.py 文件源码

def get_views(self, i_start, i_end):
        '''Gets a 2-tuple of the new and old views for the current viewport.
        The new views are synced to the data except for the size/pos
        properties.
        The old views need to be removed from the layout, and the new views
        added.
        '''
        current_views = self.views
        visible_views = {}
        new_views = []
        dirty_views = self.dirty_views
        get_view = self.get_view
        make_view_dirty = self.make_view_dirty

        # iterate though the visible view
        # add them into the container if not already done
        for index in range(i_start, i_end + 1):
            view = get_view(index)
            if not view:
                continue

            visible_views[index] = view
            current_views.pop(index, None)
            new_views.append((view, index))

        # put all the hidden view as dirty views
        for index, view in current_views.items():
            make_view_dirty(view, index)
        # save the current visible views
        self.views = visible_views
        return new_views, current_views.values()