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fullscreen: improved vertical scroll performance

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This commit is contained in:
Thibault Deckers 2019-12-24 12:10:32 +09:00
parent 1b6759384e
commit 43ef91cc7b
1 changed files with 53 additions and 37 deletions
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34
lib/widgets/fullscreen/fullscreen_page.dart
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@ -58,7 +58,8 @@ class FullscreenBody extends StatefulWidget {
}
class FullscreenBodyState extends State<FullscreenBody> with SingleTickerProviderStateMixin {
int _currentHorizontalPage, _currentVerticalPage = imagePage;
int _currentHorizontalPage;
final ValueNotifier<int> _currentVerticalPage = ValueNotifier(imagePage);
PageController _horizontalPager, _verticalPager;
final ValueNotifier<bool> _overlayVisible = ValueNotifier(true);
AnimationController _overlayAnimationController;
@ -82,7 +83,7 @@ class FullscreenBodyState extends State<FullscreenBody> with SingleTickerProvide
final index = entries.indexWhere((entry) => entry.uri == widget.initialUri);
_currentHorizontalPage = max(0, index);
_horizontalPager = PageController(initialPage: _currentHorizontalPage);
_verticalPager = PageController(initialPage: _currentVerticalPage);
_verticalPager = PageController(initialPage: _currentVerticalPage.value);
_overlayAnimationController = AnimationController(
duration: const Duration(milliseconds: 400),
vsync: this,
@ -121,11 +122,9 @@ class FullscreenBodyState extends State<FullscreenBody> with SingleTickerProvide
@override
Widget build(BuildContext context) {
final entry = _currentHorizontalPage != null && _currentHorizontalPage < entries.length ? entries[_currentHorizontalPage] : null;
final showOverlay = entry != null && _currentVerticalPage == imagePage;
final videoController = showOverlay && entry.isVideo ? _videoControllers.firstWhere((kv) => kv.item1 == entry.path, orElse: () => null)?.item2 : null;
return WillPopScope(
onWillPop: () {
if (_currentVerticalPage == infoPage) {
if (_currentVerticalPage.value == infoPage) {
_goToVerticalPage(imagePage);
return Future.value(false);
}
@ -145,15 +144,29 @@ class FullscreenBodyState extends State<FullscreenBody> with SingleTickerProvide
onImageTap: () => _overlayVisible.value = !_overlayVisible.value,
onImagePageRequested: () => _goToVerticalPage(imagePage),
),
if (showOverlay) FullscreenTopOverlay(
ValueListenableBuilder<int>(
valueListenable: _currentVerticalPage,
builder: (context, page, child) {
final showOverlay = entry != null && page == imagePage;
return showOverlay
? FullscreenTopOverlay(
entries: entries,
index: _currentHorizontalPage,
scale: _topOverlayScale,
viewInsets: _frozenViewInsets,
viewPadding: _frozenViewPadding,
onActionSelected: (action) => _actionDelegate.onActionSelected(context, entry, action),
)
: const SizedBox.shrink();
},
),
if (showOverlay) Positioned(
ValueListenableBuilder<int>(
valueListenable: _currentVerticalPage,
builder: (context, page, child) {
final showOverlay = entry != null && page == imagePage;
final videoController = showOverlay && entry.isVideo ? _videoControllers.firstWhere((kv) => kv.item1 == entry.path, orElse: () => null)?.item2 : null;
return showOverlay
? Positioned(
bottom: 0,
child: Column(
children: [
@ -176,6 +189,9 @@ class FullscreenBodyState extends State<FullscreenBody> with SingleTickerProvide
),
],
),
)
: const SizedBox.shrink();
},
),
],
),
@ -191,8 +207,8 @@ class FullscreenBodyState extends State<FullscreenBody> with SingleTickerProvide
}
void _onVerticalPageChanged(int page) {
setState(() => _currentVerticalPage = page);
if (_currentVerticalPage == transitionPage) {
_currentVerticalPage.value = page;
if (page == transitionPage) {
_onLeave();
Navigator.pop(context);
}