As stated at http://www.gimp.org/bugs/ I'm supposed to mention issues here before throwing them into the tracker so here goes. Working on a plugin that does some layer manipulation and kept encountering the error: AttributeError: 'gimp.Layer' object has no attribute 'layers' when trying to access the layer structure in a tree-like fashion to find "sibling" layers in the same grouplayer/layergroup. After being puzzled, I found the issue, which seems to essentially be that the "parent" attribute of a layer automatically "upcasts" to gimp.Layer, rather than yielding a gimp.GroupLayer, as I think should be expected. The behavior can be reproduced as follows from Python console in GIMP 2.8.8: >>> image = gimp.image_list()[0] >>> image.layers[0].layers[0].parent.layers # again with the result: AttributeError: 'gimp.Layer' object has no attribute 'layers' Assuming an image's layer-structure is similar to: [root image] +--------GROUPLAYER ZERO +--------+--------LAYER ZERO OF ZERO +--------GROUPLAYER ONE +--------+--------LAYER ZERO OF ONE +--------+--------LAYER ONE OF ONE +--------LAYER BACKGROUND >From the console we have a hint as to why this is. >>> image.layers[0] <gimp.GroupLayer "GROUPLAYER ZERO"> >>> image.layers[0].layers[0].parent # should return the same layer as above but gives <gimp.Layer "GROUPLAYER ZERO"> I haven't seen this on the bugtracker nor was I able to find discussion about it on the listserv archive. I assume it is a platform-independent bug. Can anyone confirm that? I develop on Windows XP at present. Workarounds for this bug exist I'm not in love with them (inelegant). Regardless, a sketch of what might work without using globals: def get_all_layers(parent): """-> list. recursively get all layers from either an image, or a GroupLayer Proceeds depth-first. """ container=[] for layer in parent.layers: container.append(layer) if hasattr(layer,"layers"): container.extend( get_all_layers(layer) ) return container def get_parent(child): if hasattr(child,"parent"): for layer in get_all_layers(child.image): if layer.name==child.parent.name: return layer #^ layer will have the proper data-type of gimp.GroupLayer, so return it. #^.. We do this because child.parent yields a gimp.Layer, which is undesired. else: return child.image # if we're already top-level, parent must just be the image. Cheers - Seldom _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
