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[rename fixit] ItemsSnapAlignment -> PageableListFlingBehavior

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Fixes #2448
This commit is contained in:
Adam Barth 2016-03-12 17:07:54 -08:00
parent 9b9ad3db17
commit 6a2edbbff5
1 changed files with 13 additions and 11 deletions
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24
packages/flutter/lib/src/widgets/pageable_list.dart
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@ -12,10 +12,10 @@ import 'scroll_behavior.dart';
import 'scrollable.dart';
import 'virtual_viewport.dart';
/// Controls what alignment items use when settling.
enum ItemsSnapAlignment {
item,
adjacentItem
/// Controls how a pageable list should behave during a fling.
enum PageableListFlingBehavior {
canFlingAcrossMultiplePages,
stopAtNextPage
}
/// Scrollable widget that scrolls one "page" at a time.
@ -33,7 +33,7 @@ class PageableList extends Scrollable {
ScrollListener onScrollEnd,
SnapOffsetCallback snapOffsetCallback,
this.itemsWrap: false,
this.itemsSnapAlignment: ItemsSnapAlignment.adjacentItem,
this.itemsSnapAlignment: PageableListFlingBehavior.stopAtNextPage,
this.onPageChanged,
this.scrollableListPainter,
this.duration: const Duration(milliseconds: 200),
@ -48,13 +48,15 @@ class PageableList extends Scrollable {
onScroll: onScroll,
onScrollEnd: onScrollEnd,
snapOffsetCallback: snapOffsetCallback
);
) {
assert(itemsSnapAlignment != null);
}
/// Whether the first item should be revealed after scrolling past the last item.
final bool itemsWrap;
/// Controls whether a fling always reveals the adjacent item or whether flings can traverse many items.
final ItemsSnapAlignment itemsSnapAlignment;
final PageableListFlingBehavior itemsSnapAlignment;
/// Called when the currently visible page changes.
final ValueChanged<int> onPageChanged;
@ -187,7 +189,7 @@ class PageableListState<T extends PageableList> extends ScrollableState<T> {
ScrollBehavior<double, double> createScrollBehavior() => scrollBehavior;
bool get shouldSnapScrollOffset => config.itemsSnapAlignment == ItemsSnapAlignment.item;
bool get shouldSnapScrollOffset => config.itemsSnapAlignment == PageableListFlingBehavior.canFlingAcrossMultiplePages;
double snapScrollOffset(double newScrollOffset) {
final double previousItemOffset = newScrollOffset.floorToDouble();
@ -205,10 +207,10 @@ class PageableListState<T extends PageableList> extends ScrollableState<T> {
Future<Null> fling(double scrollVelocity) {
switch(config.itemsSnapAlignment) {
case ItemsSnapAlignment.adjacentItem:
return _flingToAdjacentItem(scrollVelocity);
default:
case PageableListFlingBehavior.canFlingAcrossMultiplePages:
return super.fling(scrollVelocity).then(_notifyPageChanged);
case PageableListFlingBehavior.stopAtNextPage:
return _flingToAdjacentItem(scrollVelocity);
}
}