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https://issues.apache.org/jira/browse/PIVOT-534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916215#action_12916215
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Chris Bartlett commented on PIVOT-534:
--------------------------------------
Going back to the discussion on transition rates & durations in the KitchenSink
demo...
For the KitchenSink demo it might be worth tweaking the transition settings to
take into account the content contained in the different RollUps. It is
probably one of the most viewed demos and as such should be trying to show the
best of Pivot. I'm not suggesting setting the frame rates artificially high,
merely to adjust the settings in order to demonstrate how slick various
transitions *can* look.
The RollUps whose transitions look the least smooth to my eyes are 'Splitters'
and 'Menus' as they are tall and also have dark content compared to the
background. The 'Buttons' and 'Trees' RollUps are also quite tall but look a
little less jerky to me possibly due to their lighter content.
I have been struggling to produce some good screen captures to demonstrate
this, but just looking at the figures involved might suffice for now.
A RollUp has a default transition duration of 250 milliseconds and transition
rate of 30 frames per second.
(30 fps * 0.25 seconds) = 7.5 'paints' over the duration of the transition
(assuming a perfect world with sufficient processing power and perfect, high
resolution clocks)
If a RollUp contains relatively tall components (for this example I will use
750 pixels to keep the maths simple), then on average it would have to expand
the RollUp by 100 pixels per paint.
However, if the contained components were only 375 pixels high, an average
paint would cover an expansion of 50 pixels.
RollUps use Quadratic easing rather than simple Linear, so the expanded height
changes between paints varies, but that is not especially relevant here, rather
the total 'distance' covered by the expansion.
> Expose transtion durations & rates in Terra theme skins as styles to allow
> them to be configured
> ------------------------------------------------------------------------------------------------
>
> Key: PIVOT-534
> URL: https://issues.apache.org/jira/browse/PIVOT-534
> Project: Pivot
> Issue Type: Improvement
> Components: wtk, wtk-terra
> Affects Versions: 1.5
> Environment: n/a
> Reporter: Chris Bartlett
> Assignee: Chris Bartlett
> Priority: Minor
> Fix For: 2.0
>
> Attachments: PIVOT-534_ExposeTransitionsAsStyles.patch
>
>
> org.apache.pivot.wtk.skin.CardPaneSkin
> add selectionChangeRate
> org.apache.pivot.wtk.skin.terra.TerraAccordionSkin
> add selectionChangeDuration
> add selectionChangeRate
> org.apache.pivot.wtk.skin.terra.TerraExpanderSkin
> add expandDuration
> add expandRate
> org.apache.pivot.wtk.skin.terra.TerraRollupSkin
> add expandDuration
> add expandRate
> org.apache.pivot.wtk.skin.terra.TerraSheetSkin
> add transitionDuration
> add transitionRate
> org.apache.pivot.wtk.skin.terra.TerraTabPaneSkin
> add selectionChangeDuration
> add selectionChangeRate
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