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Use latest enableRenderCache from Lottie #2

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Use latest enableRenderCache from Lottie #2

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118 changes: 17 additions & 101 deletions lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -86,118 +86,34 @@ class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
children: <Widget>[
SwitchListTile(
title: Text('Enable Render Cache'),
value: _enableRenderCache,
onChanged: (v) {
setState(() {
_enableRenderCache = v;
});
},
),
Expanded(
child: GridView.builder(
itemCount: 250,
gridDelegate:
const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3),
const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3),
itemBuilder: (BuildContext context, int index) {
var cachedAnimation = CachedLottie(
Size(150, 150),
widget.lottieAnimation);

final testStillImages = false;

if (testStillImages) {
return material.Image.network(
'https://loremflickr.com/100/100/music?lock=$index',
);
} else {
return CachedLottiePlayer(
lottie: cachedAnimation,
);
}
}
),
return Lottie(
composition: widget.lottieAnimation,
enableRenderCache: _enableRenderCache,
);
}),
),
],
),
),

),
),
);
}
}



// A class to cache the images inside the lottie animations
class CachedLottie {
final Size size;
final LottieComposition composition;
final List<Image?> images;
late final _drawable = LottieDrawable(composition);

CachedLottie(this.size, this.composition)
: images = List.filled(composition.durationFrames.ceil(), null);

Duration get duration => composition.duration;

Image imageAt(BuildContext context, double progress) {
var index = (images.length * progress).round() % images.length;
return images[index] ??= _takeImage(context, progress);
}

Image _takeImage(BuildContext context, double progress) {
var recorder = PictureRecorder();
var canvas = Canvas(recorder);

var devicePixelRatio = View.of(context).devicePixelRatio;

_drawable
..setProgress(progress)
..draw(canvas, Offset.zero & (size * devicePixelRatio));
var picture = recorder.endRecording();
return picture.toImageSync((size.width * devicePixelRatio).round(),
(size.height * devicePixelRatio).round());
}
}

// A Player for the cached the images of the lottie animations
class CachedLottiePlayer extends StatefulWidget {
final CachedLottie lottie;
final AnimationController? controller;

const CachedLottiePlayer({
super.key,
required this.lottie,
this.controller,
});

@override
State<CachedLottiePlayer> createState() => _CachedLottiePlayerState();
}

class _CachedLottiePlayerState extends State<CachedLottiePlayer>
with TickerProviderStateMixin {
late final AnimationController _autoController =
AnimationController(vsync: this, duration: widget.lottie.duration)
..repeat();

@override
Widget build(BuildContext context) {
var controller = widget.controller ?? _autoController;
return AnimatedBuilder(
animation: controller,
builder: (context, _) {
var image = widget.lottie.imageAt(context, controller.value);
return material.RawImage(
image: image,
width: widget.lottie.size.width,
height: widget.lottie.size.height,
);
},
);
}

@override
void dispose() {
_autoController.dispose();
super.dispose();
}

}


2 changes: 1 addition & 1 deletion pubspec.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ environment:
dependencies:
flutter:
sdk: flutter
lottie: ^2.7.0
lottie: ^3.0.0-alpha.1


# The following adds the Cupertino Icons font to your application.
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