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Ease tab swipe transitions (#5111)

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Hans Muller 2016-07-28 10:59:36 -07:00 committed by GitHub
parent 8c8409d6e4
commit dc85f0bbff
1 changed files with 11 additions and 10 deletions
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21
packages/flutter/lib/src/material/tabs.dart
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@ -609,14 +609,15 @@ class TabBarSelectionState<T> extends State<TabBarSelection<T>> {
// If the selected value change was triggered by a drag gesture, the current
// value of _controller.value will reflect where the gesture ended. While
// the drag was underway progress indicates where the indicator and TabBarView
// scrollPosition are vis the indices of the two tabs adjacent to the selected
// one. So 0.5 means the drag didn't move at all, 0.0 means the drag extended
// to the beginning of the tab on the left and 1.0 likewise for the tab on the
// right. That is unless the index of the selected value was 0 or values.length - 1.
// In those cases progress just moves between the selected tab and the adjacent
// one. Convert progress to reflect the fact that we're now moving between (just)
// the previous and current selection index.
// the drag was underway the controller's value indicates where the indicator
// and TabBarView scrollPositions are vis the indices of the two tabs adjacent
// to the selected one. So 0.5 means the drag didn't move at all, 0.0 means the
// drag extended to the beginning of the tab on the left and 1.0 likewise for
// the tab on the right. That is unless the index of the selected value was 0
// or values.length - 1. In those cases the controller's value just moves between
// the selected tab and the adjacent one. So: convert the controller's value
// here to reflect the fact that we're now moving between (just) the previous
// and current selection index.
double value;
if (_controller.status == AnimationStatus.completed)
@ -1187,10 +1188,10 @@ class _TabBarViewState<T> extends PageableListState<TabBarView<T>> implements Ta
if (selectedIndex < previousSelectedIndex) {
_updateItemsFromChildren(selectedIndex, previousSelectedIndex);
scrollTo(1.0 - animation.value);
scrollTo(new CurveTween(curve: Curves.ease.flipped).evaluate(new ReverseAnimation(animation)));
} else {
_updateItemsFromChildren(previousSelectedIndex, selectedIndex);
scrollTo(animation.value);
scrollTo(new CurveTween(curve: Curves.ease).evaluate(animation));
}
}