I was considering an approach similar to what is used in saving project file: using cPickle to create a "state" of project object (written to a StringIO object), and inserted in a "history" stack/list. This way we could have a undo/redo system, but a history system as well, with the possibility to go back to any previous state of the working session, and besides it would use a rather simple trick, with parts of code already implemented. History stack size can be limited to a certain number of stages with user preferences system, or set to a reasonable hardcoded value. With some work on set_project_modified() function that can trigger project's state storing action... The doubts I have are about memory usage (not a great issue I suppose using binary protocol of cpickle and with a stack limited to e.g. 10 passes) and speed (but cPickle and cStringIO are supposed to be rather fast) what do you think?
francesco Il giorno gio, 21/01/2010 alle 09.56 +0000, Andy Finch ha scritto: > I haven't, I've been looking at other stuff. Although I have been > looking around recently at how undo is done in python and came across > this, which may help: > > http://www.nongnu.org/skencil/doc.html > > then follow the link to the undo documentation: > > http://www.nongnu.org/skencil/Doc/devguide-19.html#N1 > > Cheers, > Andy. > > 2010/1/21 francesco fantoni <[email protected]> > just to know, has someone already started working on the > undo/history > thing? > > best to all, > francesco > -- > architetto Francesco Fantoni > <HVA - Hermanitos Verdes Architetti> > l.go san giacomo, 38 > I-41100 modena (italia) > tel.& fax. +39.059.217554 > skype: hva_studio > e.mail: [email protected] > web: http://www.hv-a.com > > > _______________________________________________ > Mailing list: https://launchpad.net/~openshot.developers > Post to : [email protected] > Unsubscribe : https://launchpad.net/~openshot.developers > More help : https://help.launchpad.net/ListHelp > -- architetto Francesco Fantoni <HVA - Hermanitos Verdes Architetti> l.go san giacomo, 38 I-41100 modena (italia) tel.& fax. +39.059.217554 skype: hva_studio e.mail: [email protected] web: http://www.hv-a.com _______________________________________________ Mailing list: https://launchpad.net/~openshot.developers Post to : [email protected] Unsubscribe : https://launchpad.net/~openshot.developers More help : https://help.launchpad.net/ListHelp
