Flutter-Music-Player/lib/widgets/mp_album_ui.dart

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flute_music_player/flute_music_player.dart';

class AlbumUI extends StatefulWidget {
  final Song song;
  final Duration position;
  final Duration duration;
  AlbumUI(this.song, this.duration, this.position);
  @override
  AlbumUIState createState() {
    return new AlbumUIState();
  }
}

class AlbumUIState extends State<AlbumUI> with SingleTickerProviderStateMixin {
  Animation<double> animation;
  AnimationController animationController;

  @override
  initState() {
    super.initState();
    animationController = new AnimationController(
        vsync: this, duration: new Duration(seconds: 1));
    animation = new CurvedAnimation(
        parent: animationController, curve: Curves.elasticOut);
    animation.addListener(() => this.setState(() {}));
    animationController.forward();
  }

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

  @override
  Widget build(BuildContext context) {
    // Song song = MPInheritedWidget.of(context).songData.nextSong;
    var f = widget.song.albumArt == null
        ? null
        : new File.fromUri(Uri.parse(widget.song.albumArt));

    var myHero = new Hero(
      tag: widget.song.title,
      child: new Material(
          borderRadius: new BorderRadius.circular(5.0),
          elevation: 5.0,
          child: f != null
              ? new Image.file(
                  f,
                  fit: BoxFit.cover,
                  height: 250.0,
                  gaplessPlayback: true,
                )
              : new Image.asset(
                  "assets/music_record.jpeg",
                  fit: BoxFit.cover,
                  height: 250.0,
                  gaplessPlayback: false,
                )),
    );

    return new SizedBox.fromSize(
      size: new Size(animation.value * 250.0, animation.value * 250.0),
      child: new Stack(
        children: <Widget>[
          myHero,
          new Container(
            alignment: Alignment.bottomCenter,
            padding: const EdgeInsets.symmetric(horizontal: 0.8),
            child: new Material(
              borderRadius: new BorderRadius.circular(5.0),
              child: new Stack(children: [
                new LinearProgressIndicator(
                    value: 1.0,
                    valueColor: new AlwaysStoppedAnimation(
                        Theme.of(context).buttonColor)),
                new LinearProgressIndicator(
                  value: widget.position != null &&
                          widget.position.inMilliseconds > 0
                      ? (widget.position?.inMilliseconds?.toDouble() ?? 0.0) /
                          (widget.duration?.inMilliseconds?.toDouble() ?? 0.0)
                      : 0.0,
                  valueColor:
                      new AlwaysStoppedAnimation(Theme.of(context).cardColor),
                  backgroundColor: Theme.of(context).buttonColor,
                ),
              ]),
            ),
          ),
        ],
      ),
    );
  }
}