Hibok/lib/chat/download_item.dart

import 'package:chat/chat/video_view.dart';
import 'package:chat/models/ChatMsg.dart';
import 'package:chat/proto/all.pbserver.dart';
import 'package:chat/utils/screen.dart';
import 'package:chat/utils/upload_util.dart';
import 'package:flutter/material.dart';
import 'package:percent_indicator/circular_percent_indicator.dart';

class DownloadItem extends StatefulWidget {
  final MsgModel msg;
  final Widget child;
  final bool isShowProgress;
  final bool isAutoDown;
  final Function onComplete;
  DownloadItem(
      {this.msg,
      this.child,
      this.isShowProgress = true,
      this.isAutoDown = true,
      this.onComplete});
  @override
  _DownloadItemState createState() => _DownloadItemState();
}

class _DownloadItemState extends State<DownloadItem> {
  int downloadState = 0; //0,默认，1进行中，2成功，3失败

  @override
  void initState() {
    super.initState();

    if (widget.msg.localFile == null) {
      if (widget.isAutoDown &&
          (widget.msg.state != MsgState.Downloading &&
              widget.msg.state != MsgState.DownloadSuccess)) {
        downloadRes();
      }
    }
  }

  downloadRes() async {
    print('开始下载文件${widget.msg.extraFile}');
    widget.msg.state = MsgState.Downloading;

    if (mounted) {
      setState(() {});
    }
    var filePath = await UploadUtil().downloadFile(widget.msg);

    if (filePath != null) {
      print('下载完成');
      if (widget.onComplete != null) {
        widget.onComplete();
      }
      if (mounted) {
        setState(() {});
      }
    } else {
      print('下载文件失败');

      if (mounted) {
        setState(() {});
      }
    }
  }

  showVideoPage(BuildContext context, String filePath) {
    Navigator.push(context,
        MaterialPageRoute<void>(builder: (BuildContext context) {
      return VideoPage(videoPath: filePath);
    }));
  }

  _downloadWidget() {
    if (widget.msg.localFile != null) {
      if (widget.msg.msgType == ChatType.ShortVideoChatType.value) {
        return Icon(Icons.play_circle_outline, color: Colors.white);
      }
    } else {
      if (widget.msg.state == MsgState.DownloadFailed) {
        return Container(
          padding: EdgeInsets.all(5),
          decoration: BoxDecoration(
              color: Colors.grey.withAlpha(150),
              borderRadius: BorderRadius.circular(8)),
          child: Icon(Icons.refresh, color: Colors.white70),
        );
      } else if (widget.msg.state == MsgState.Downloading &&
          widget.isShowProgress) {
        return StreamBuilder(
          stream: UploadUtil().getStream(widget.msg.extraFile).stream,
          initialData: UploadUtil().streamLastPercentMap[widget.msg.extraFile],
          builder: (BuildContext context, AsyncSnapshot snapshot) {
            if (snapshot.data != null) {
              if (snapshot.data >= 1) {
                return SizedBox(width: 0, height: 0);
              }

              return CircularPercentIndicator(
                radius: 30.0,
                lineWidth: 2.0,
                percent: snapshot.data,
                center: Padding(
                    padding: EdgeInsets.all(2),
                    child: fixedText(
                        "${(snapshot.data * 100).toStringAsFixed(0)}%",
                        fontSize: 9,
                        color: Colors.green)),
                progressColor: Colors.green,
              );
            } else {
              return SizedBox(width: 0, height: 0);
            }
          },
        );
      } else if (widget.msg.state < MsgState.Downloading) {
        if (widget.msg.msgType == ChatType.ShortVideoChatType.value) {
          return Icon(Icons.play_circle_outline, color: Colors.white);
        }
      }
    }

    return Container(width: 0, height: 0);
  }

  @override
  Widget build(BuildContext context) {
    bool isNeedDown = widget.msg.localFile == null &&
        (widget.msg.state != MsgState.Downloading &&
            widget.msg.state != MsgState.DownloadSuccess);
    return InkWell(
        onTap: isNeedDown ? downloadRes : null,
        child: Stack(
          alignment: Alignment.center,
          children: <Widget>[widget.child, _downloadWidget()],
        ));
  }
}