Yes it’s possible. Although I don’t know what type of performance this would have for non-trivial stuff.
- Create your animation
- Kick off your animation with a “Play Animation Node”
- Set Playback Speed of the Play Animation node to 0.0
- In your slider widget graph, create a new event “On Value Changed” for the slider
- User the “Set Animation Current Time” for your animation. You can use your slider value to drive the Time of the animation
Example blueprint demonstrating this setup: Control UMG animation with slider posted by anonymous | blueprintUE | PasteBin For Unreal Engine 4