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lottie_integration.dart
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lottie_integration.dart
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import 'package:pub_semver/pub_semver.dart';
import '../../settings/asset_type.dart';
import 'integration.dart';
import 'dart:convert';
import 'dart:io';
import 'package:path/path.dart' as p;
class LottieIntegration extends Integration {
LottieIntegration(String packageParameterLiteral)
: super(packageParameterLiteral);
// These are required keys for this integration.
static const lottieKeys = [
'w', // width
'h', // height
'ip', // The frame at which the Lottie animation starts at
'op', // The frame at which the Lottie animation ends at
'fr', // frame rate
'v', // // Must include version
'layers', // Must include layers
];
String get packageExpression => packageParameterLiteral.isNotEmpty
? ' = \'$packageParameterLiteral\''
: '';
@override
List<String> get requiredImports => [
'package:lottie/lottie.dart',
];
@override
String get classOutput => _classDefinition;
String get _classDefinition => '''class LottieGenImage {
const LottieGenImage(this._assetName);
final String _assetName;
LottieBuilder lottie({
Animation<double>? controller,
bool? animate,
FrameRate? frameRate,
bool? repeat,
bool? reverse,
LottieDelegates? delegates,
LottieOptions? options,
void Function(LottieComposition)? onLoaded,
LottieImageProviderFactory? imageProviderFactory,
Key? key,
AssetBundle? bundle,
Widget Function(BuildContext, Widget, LottieComposition?)? frameBuilder,
ImageErrorWidgetBuilder? errorBuilder,
double? width,
double? height,
BoxFit? fit,
AlignmentGeometry? alignment,
String? package$packageExpression,
bool? addRepaintBoundary,
FilterQuality? filterQuality,
void Function(String)? onWarning,
}) {
return Lottie.asset(
_assetName,
controller: controller,
animate: animate,
frameRate: frameRate,
repeat: repeat,
reverse: reverse,
delegates: delegates,
options: options,
onLoaded: onLoaded,
imageProviderFactory: imageProviderFactory,
key: key,
bundle: bundle,
frameBuilder: frameBuilder,
errorBuilder: errorBuilder,
width: width,
height: height,
fit: fit,
alignment: alignment,
package: package,
addRepaintBoundary: addRepaintBoundary,
filterQuality: filterQuality,
onWarning: onWarning,
);
}
String get path => ${packageParameterLiteral.isEmpty ? '_assetName' : '\'packages/$packageParameterLiteral/\$_assetName\''};
}''';
@override
String get className => 'LottieGenImage';
@override
String classInstantiate(String path) => 'LottieGenImage(\'$path\')';
@override
bool isSupport(AssetType type) => isLottieFile(type);
@override
bool get isConstConstructor => true;
bool isLottieFile(AssetType type) {
if (type.mime != 'application/json') {
return false;
}
try {
final absolutePath = p.join(type.rootPath, type.path);
String input = File(absolutePath).readAsStringSync();
final fileKeys = jsonDecode(input) as Map<String, dynamic>;
if (lottieKeys.every((key) => fileKeys.containsKey(key)) &&
fileKeys['v'] != null) {
var version = Version.parse(fileKeys['v']);
// Lottie version 4.4.0 is the first version that supports BodyMovin.
// https://github.com/xvrh/lottie-flutter/blob/0e7499d82ea1370b6acf023af570395bbb59b42f/lib/src/parser/lottie_composition_parser.dart#L60
return version >= Version(4, 4, 0);
}
} on FormatException catch (e) {
// Catches bad/corrupted json and reports it to user.
stderr.writeln(e.message);
}
return false;
}
}