Example for keyframe animation open source app?

[gmgiadinh176]

Hello all
im searching for example ( open source ) for implemating key frame animation gui
for example like this in the Qt studio :

But much much simpler then this ...
Thanks

[mrjj]

Hi
https://github.com/rivenblades/Timeline
https://github.com/iwxyi/Qt-Timeline-Widget

could be used as base.