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TabBarView is-a PageableList, doesn't need itemExtent

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This commit is contained in:
Hans Muller 2015-12-10 11:28:28 -08:00
parent 4fa9e57185
commit 9651db22df
1 changed files with 11 additions and 17 deletions
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28
packages/flutter/lib/src/material/tabs.dart
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@ -28,7 +28,7 @@ const double _kMinTabWidth = 72.0;
const double _kMaxTabWidth = 264.0;
const EdgeDims _kTabLabelPadding = const EdgeDims.symmetric(horizontal: 12.0);
const double _kTabBarScrollDrag = 0.025;
const Duration _kTabBarScroll = const Duration(milliseconds: 200);
const Duration _kTabBarScroll = const Duration(milliseconds: 800);
class _TabBarParentData extends ContainerBoxParentDataMixin<RenderBox> { }
@ -612,19 +612,17 @@ class _TabBarState extends ScrollableState<TabBar> {
}
}
class TabBarView<T> extends ScrollableList<T> {
class TabBarView<T> extends PageableList<T> {
TabBarView({
Key key,
this.selection,
List<T> items,
ItemBuilder<T> itemBuilder,
double itemExtent
ItemBuilder<T> itemBuilder
}) : super(
key: key,
scrollDirection: ScrollDirection.horizontal,
items: items,
itemBuilder: itemBuilder,
itemExtent: itemExtent,
itemsWrap: false
) {
assert(selection != null);
@ -640,9 +638,11 @@ class _NotScrollable extends BoundedBehavior {
bool get isScrollable => false;
}
class _TabBarViewState<T> extends ScrollableListState<T, TabBarView<T>> {
class _TabBarViewState<T> extends PageableListState<T, TabBarView<T>> {
ScrollBehavior createScrollBehavior() => new _NotScrollable();
final _NotScrollable _notScrollable = new _NotScrollable();
ScrollBehavior createScrollBehavior() => _notScrollable;
ExtentScrollBehavior get scrollBehavior => _notScrollable;
List<int> _itemIndices = [0, 1];
AnimationDirection _scrollDirection = AnimationDirection.forward;
@ -655,10 +655,10 @@ class _TabBarViewState<T> extends ScrollableListState<T, TabBarView<T>> {
scrollTo(0.0);
} else if (selectedIndex == config.items.length - 1) {
_itemIndices = <int>[selectedIndex - 1, selectedIndex];
scrollTo(config.itemExtent);
scrollTo(1.0);
} else {
_itemIndices = <int>[selectedIndex - 1, selectedIndex, selectedIndex + 1];
scrollTo(config.itemExtent);
scrollTo(1.0);
}
}
@ -680,12 +680,6 @@ class _TabBarViewState<T> extends ScrollableListState<T, TabBarView<T>> {
super.dispose();
}
void didUpdateConfig(TabBarView oldConfig) {
super.didUpdateConfig(oldConfig);
if (oldConfig.itemExtent != config.itemExtent && !_performance.isAnimating)
_initItemIndicesAndScrollPosition();
}
void _handleStatusChange(PerformanceStatus status) {
final int selectedIndex = config.selection.index;
final int previousSelectedIndex = config.selection.previousIndex;
@ -705,9 +699,9 @@ class _TabBarViewState<T> extends ScrollableListState<T, TabBarView<T>> {
void _handleProgressChange() {
if (_scrollDirection == AnimationDirection.forward)
scrollTo(config.itemExtent * _performance.progress);
scrollTo(_performance.progress);
else
scrollTo(config.itemExtent * (1.0 - _performance.progress));
scrollTo(1.0 - _performance.progress);
}
int get itemCount => _itemIndices.length;