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Message #94040
[Bug 1469750] Re: [sdk] Programmatic slider movement is jerky
** Description changed:
+ [Updated description]
+
Ubuntu 15.04 r51
1. In System Settings, navigate to Brightness.
2. Turn on "Adjust automatically" if it is not on already.
3. Go into a much lighter or darker environment, for example by turning lights on/off.
What you see: The slider pops suddenly from one point to another.
What you should see: The slider slides smoothly, accelerating as it
leaves its previous value, and decelerating as it reaches its new value.
The brightness slider is just the first ever example of this: it should
be a general property of sliders whenever their value is changed non-
interactively.
It may save time to fix bug 1388094 at the same time as this bug.
+
+ –––
+
+ Desired resolution:
+
+ We need an easing curve for this animation. We use this animation curve:
+ http://easings.net/#easeOutCubic for most animations of this type.
+
+ Please use this easing curve for the animation between the two points on
+ the programmatic slider.
** Changed in: ubuntu-ux
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1469750
Title:
[sdk] Programmatic slider movement is jerky
Status in Ubuntu UX:
In Progress
Status in ubuntu-ui-toolkit package in Ubuntu:
Confirmed
Bug description:
[Updated description]
Ubuntu 15.04 r51
1. In System Settings, navigate to Brightness.
2. Turn on "Adjust automatically" if it is not on already.
3. Go into a much lighter or darker environment, for example by turning lights on/off.
What you see: The slider pops suddenly from one point to another.
What you should see: The slider slides smoothly, accelerating as it
leaves its previous value, and decelerating as it reaches its new
value.
The brightness slider is just the first ever example of this: it
should be a general property of sliders whenever their value is
changed non-interactively.
It may save time to fix bug 1388094 at the same time as this bug.
–––
Desired resolution:
We need an easing curve for this animation. We use this animation
curve: http://easings.net/#easeOutCubic for most animations of this
type.
Please use this easing curve for the animation between the two points
on the programmatic slider.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-ux/+bug/1469750/+subscriptions
References