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fullscreen: sliding overlay on tap

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This commit is contained in:
Thibault Deckers 2019-07-27 18:36:39 +09:00
parent d8c28509b8
commit beb31f1f98
1 changed files with 29 additions and 6 deletions
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29
lib/image_fullscreen_page.dart
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@ -20,9 +20,12 @@ class ImageFullscreenPage extends StatefulWidget {
ImageFullscreenPageState createState() => ImageFullscreenPageState();
}
class ImageFullscreenPageState extends State<ImageFullscreenPage> {
class ImageFullscreenPageState extends State<ImageFullscreenPage> with SingleTickerProviderStateMixin {
int _currentPage;
PageController _pageController;
ValueNotifier<bool> _overlayVisible = ValueNotifier(false);
AnimationController _overlayAnimationController;
Animation<Offset> _overlayOffset;
List<Map> get entries => widget.entries;
@ -32,10 +35,17 @@ class ImageFullscreenPageState extends State<ImageFullscreenPage> {
final index = entries.indexWhere((entry) => entry['uri'] == widget.initialUri);
_currentPage = max(0, index);
_pageController = PageController(initialPage: _currentPage);
_overlayAnimationController = AnimationController(
duration: Duration(milliseconds: 250),
vsync: this,
);
_overlayOffset = Tween(begin: Offset(0, 0), end: Offset(0, 1)).animate(CurvedAnimation(parent: _overlayAnimationController, curve: Curves.easeOutQuart, reverseCurve: Curves.easeInQuart));
_overlayVisible.addListener(onOverlayVisibleChange);
}
@override
void dispose() {
_overlayVisible.removeListener(onOverlayVisibleChange);
super.dispose();
}
@ -44,7 +54,6 @@ class ImageFullscreenPageState extends State<ImageFullscreenPage> {
return Scaffold(
backgroundColor: Colors.black,
body: Stack(
alignment: Alignment.bottomCenter,
children: [
PhotoViewGallery.builder(
itemCount: entries.length,
@ -55,6 +64,7 @@ class ImageFullscreenPageState extends State<ImageFullscreenPage> {
heroTag: entry['uri'],
minScale: PhotoViewComputedScale.contained,
initialScale: PhotoViewComputedScale.contained,
onTapUp: (tapContext, details, value) => _overlayVisible.value = !_overlayVisible.value,
);
},
loadingChild: Center(
@ -69,10 +79,16 @@ class ImageFullscreenPageState extends State<ImageFullscreenPage> {
scrollPhysics: BouncingScrollPhysics(),
),
if (_currentPage != null)
FullscreenOverlay(
Positioned(
bottom: 0,
child: SlideTransition(
position: _overlayOffset,
child: FullscreenOverlay(
entries: entries,
index: _currentPage,
),
),
)
],
),
resizeToAvoidBottomInset: false,
@ -106,4 +122,11 @@ class ImageFullscreenPageState extends State<ImageFullscreenPage> {
// ),
);
}
onOverlayVisibleChange() {
if (_overlayVisible.value)
_overlayAnimationController.forward();
else
_overlayAnimationController.reverse();
}
}