yes - this is a bug - and it can be open in the bugtracker. On 18 June 2014 22:41, Seldom Needy <needthistool@xxxxxxxxx> wrote: > 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 _______________________________________________ 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
