Slider don't have smooth animation when start.

[naveenyadav15]

When we start the slider it takes a leap and after that it works perfectly fine.

[rvamsikrishna]

@naveenyadav15 Sorry! I could not understand you clearly. The thumb is intended to jump. Is that what you are saying?

[naveenyadav15]

No, i am saying that when it is moved in right direction at. Start it doesn't move smoothly it jumps 5 values after that it works fine.

[maddyb99]

I think what @naveenyadav15 means is that there is a bit of delay between drag start and pop up and it doesn't feel smooth enough!

I think the solution is in reducing the animation time and changing the animation (this is because the distance the animation is travelling is small for bounce to look good)

I have a potential solution in mind, if you are interested?

[rvamsikrishna]

@maddyb99 Thank you Maddy. I would really appreciate some help. You can push it forward and just submit the pull request. Or suggest the solution. I will look into it 😊

[maddyb99]

Well, I have 2 options, I will record and upload GIF for both in some time and also open a PR for the same!

[maddyb99]

I have opened PR #13 to update example and gitignore and #14 for animation

[rvamsikrishna]

@maddyb99 Thank you for the PR. Changing the animation duration and curve gives a new feel to the slider but does not solve the issue @naveenyadav15 mentions. Now I found the issue to be that of the slider thumb jumping from value 0 to like 10 or 11 instantly. I tried it removing the thumb animation completely and this issue still persists. This is what that's. needs to be fixed.

[maddyb99]

@rvamsikrishna are you running the example app in debug mode?

When we start the slider it takes a leap and after that it works perfectly fine.

This problem does not happen in release mode. It might be because of the overhead due to the flutter VM. All animations appear to be slow at first.

Debug mode builds use a virtual machine (VM) to run Dart code (hence the “debug” banner they show to remind people that they’re slightly slower) in order to enable Stateful Hot Reload.

Source: FAQ - Flutter

I also noticed this and then tried this in release mode and it works fine.

[rvamsikrishna]

@maddyb99 I removed the animations. The value jump is happening the value of slider.

[maddyb99]

Just to get on the same page, you are talking about this jump(in the middle bar), right?