Going on with experimenting with history/undo system. I've implemented a history stack, but I'm having a bit of trouble with visibility/audio buttons in clip widgets: they generate two different events, one correctly for button toggling, and another for clip dragging, that is unwanted and makes difficult to track the correct changes for undo/history system. any hint?
lp:~francesco-hermanitosverdes/openshot/francesco_undo_redo_test francesco Il giorno gio, 21/01/2010 alle 12.53 +0100, francesco fantoni ha scritto: > I've made a proof-of-concept implementation in a branch: > > lp:~francesco-hermanitosverdes/openshot/francesco_undo_redo_test > > apparently it can be done, and it seems fast enough, but it must be > further investigated. > > hope someone with better knowledge than me can review the code and see > if it is worth going on in this direction. > > ciao, francesco > > > > > Il giorno gio, 21/01/2010 alle 10.33 +0000, Andy Finch ha scritto: > > The link below uses a stack/list, but keeps it in memory (using a > > python list object) rather than writing to disk, so it is essentially > > the same thing in principle. > > > > What I do like the idea of is to write to disk a separate 'backup' of > > the project file, perhaps using an autosave, so in the event of a > > crash or some other event that corrupts the project file, there is the > > option to restore back to one of the previous backup copies. But > > that's a different discussion I guess. > > > > But I must admit I'm no expert in things like this, I was just having > > a browse around to see how other pygtk apps handle undo :-) > > > > Cheers, > > Andy. > > > > 2010/1/21 francesco fantoni <[email protected]> > > 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 > > > > > > -- 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
