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d2f7685826
Adds PageableList, other scrolling related changes and fixes Adds PageableList, other scrolling related changes and fixes - PageableList extends ScrollableList One fixed width or height item is visible and centered at a time. Fling and drag gestures scroll to the next/previous item. - Scrollable.scrollTo(), Scrollable.scrollBy(), ensureWidgetIsVisible() API changed The named animation parameter for these methods was replaced by duration and curve. All of the methods now return a Future. The Future completes when the scroll does. This change eliminates the need for Scrollable to temporarily take ownership of a ValueAnimation object (see #645). - Using Future.then() instead of an AnimationPerformance status listener In ensure_visible.dart _handleTap() uses ensureWidgetIsVisible() to center the card roughly as before and then. When the implicit scroll animation is complete, it changes the centered card's label font. The change is made when the Future returned by ensureWidgetIsVisible() completes. - FixedHeightScrollable's itemHeight parameter is now itemExtent If scrollDirection is ScrollDirection.vertical (the default) then itemExtent should be the height of each item; otherwise it should be the width of each item. Replaced _velocityForFlingGesture() in scrollable.dart with Scrollable._eventVelocity() The original version clamped pixels/ms against pixels/sec constants. The new version also deals with scrollDirection. Plumbed scrollDirection though FixedHeightScrollable and ScrollableList Both classes should now support horizontal scrolling.
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