dlna_util.dart

import 'package:dlna/dlna.dart';
import 'package:eso/eso_theme.dart';
import 'package:eso/utils.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

/// 视频投屏
class DLNAUtil {
  DLNAUtil._();

  static DLNAUtil _instance;

  /// 视频投屏
  static DLNAUtil get instance => _getInstance();

  static _getInstance() {
    if (_instance == null) {
      _instance = DLNAUtil._();
      _instance.manager = DLNAManager();
      try {
        _instance.manager.enableCache();
      } catch (e) {}
      _instance.manager.setRefresher(DeviceRefresher(onDeviceAdd: (dev) {
        if (!_instance._devices.contains(dev)) {
          _instance._devices.add(dev);
          print('add ' + dev.toString());
          _instance._update();
        }
      }, onDeviceRemove: (dev) {
        _instance._devices.remove(dev);
        print("remove $dev");
        _instance._update();
      }, onDeviceUpdate: (dev) {
        print('update $dev');
      }, onSearchError: (err) {
        print('error $err');
        _instance.isSearching = false;
        _instance._update();
      }, onPlayProgress: (position) {
        if (_instance.onPlayProgress != null) {
          _instance.onPlayProgress(position);
          return;
        }
        print('播放进度: ' +
            _time2Str(DateTime.now().millisecondsSinceEpoch) +
            ' / ' +
            position.relTime);
      }));
    }
    return _instance;
  }

  var _devices = <DLNADevice>[];
  DLNAManager manager;

  var isSearching = false;

  _update() {
    if (_state != null) _state(() => null);
  }

  StateSetter _state;

  DLNADevice curDevice;

  Function(PositionInfo positionInfo) onPlayProgress;

  /// 释放
  static release() {
    if (_instance == null) return;
    _instance.manager.release();
    _instance.manager = null;
    _instance.onPlayProgress = null;
    _instance = null;
  }

  /// 开始投屏
  start(BuildContext context,
      {String title,
      @required String url,
      String videoType = VideoObject.VIDEO_MP4,
      VoidCallback onPlay}) async {
    if (url == null || url.isEmpty) return null;

    showDialog(
        context: context,
        builder: (context) {
          String errMsg;

          return Dialog(
            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16.0)),
            child: Container(
              color: Colors.white,
              margin: const EdgeInsets.fromLTRB(16, 12, 16, 8),
              padding: const EdgeInsets.fromLTRB(12, 12, 12, 4),
              child: StatefulBuilder(builder: (context, StateSetter state) {
                _state = state;
                var children = <Widget>[];
                if (_devices.isEmpty)
                  children.add(Padding(
                    padding: const EdgeInsets.only(left: 16),
                    child: Text(isSearching ? "正在搜索设备..." : "没有可投屏的设备",
                        style: TextStyle(color: Colors.grey)),
                  ));
                else {
                  if (!Utils.empty(errMsg))
                    children.add(Padding(
                      padding: const EdgeInsets.fromLTRB(16, 8, 8, 8),
                      child: Text(errMsg, style: TextStyle(color: Colors.redAccent)),
                    ));

                  _devices.forEach((e) {
                    children.add(Material(
                      color: Colors.transparent,
                      child: ListTile(
                        title: Text(e.deviceName, style: TextStyle(fontSize: 15)),
                        dense: true,
                        selected: curDevice == e,
                        // subtitle: Text(e.description.toString()),
                        onTap: () async {
                          try {
                            if (curDevice != null) await manager.actStop();
                          } catch (e) {}
                          try {
                            PlayMode playMode = PlayMode.NORMAL;
                            await manager.actSetPlayMode(playMode);
                            manager.setDevice(e);
                            await Utils.sleep(200);

                            var _type = videoType;
                            if (Utils.empty(_type)) {
                              if (url.indexOf('.mp4') > 1)
                                _type = VideoObject.VIDEO_MP4;
                              else if (url.indexOf('.m3u8') > 1)
                                _type = VideoObject.VIDEO_H264;
                              else if (url.indexOf('.avi') > 1)
                                _type = VideoObject.VIDEO_AVI;
                              if (Utils.empty(_type)) _type = VideoObject.VIDEO_MP4;
                            }

                            var video = VideoObject("ESO", url, _type);
                            video.refreshPosition = true;

                            var result = await manager.actSetVideoUrl(video);
                            if (result.success) {
                              curDevice = e;
                              _update();
                            } else {
                              errMsg = '投屏失败：' + result.errorMessage;
                              _update();
                            }
                          } catch (e) {
                            print(e);
                            return;
                          }
                          if (onPlay != null) onPlay();
                        },
                      ),
                    ));
                  });
                }

//            var _makeDevice = (String name) {
//              var item = DLNADevice();
//              item.description = DLNADescription();
//              item.description.friendlyName = name;
//              return item;
//            };

                final _btnColor =
                    curDevice == null ? Colors.grey : Theme.of(context).accentColor;

                return Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text("DLNA 投屏",
                        style: TextStyle(
                            fontSize: 18,
                            fontFamily: ESOTheme.staticFontFamily,
                            fontWeight: FontWeight.bold)),
                    SizedBox(height: 16),
                    ConstrainedBox(
                      constraints: BoxConstraints(
                          maxHeight: MediaQuery.of(context).size.height - 260),
                      child: SingleChildScrollView(
                        child: Column(
                          mainAxisSize: MainAxisSize.min,
                          children: children,
                        ),
                      ),
                    ),
                    SizedBox(height: 16),
                    ButtonTheme(
                      textTheme: ButtonTextTheme.accent,
                      minWidth: 50,
                      child: Material(
                        color: Colors.transparent,
                        child: Row(
                          mainAxisSize: MainAxisSize.max,
                          crossAxisAlignment: CrossAxisAlignment.end,
                          children: [
                            TextButton(
                                child: Text(isSearching ? "停止搜索" : "搜索设备"),
                                onPressed: () async {
                                  if (!isSearching) {
                                    if (_devices.isEmpty) {
                                      manager.startSearch();
                                      Future.delayed(Duration(seconds: 30), () {
                                        manager.stopSearch();
                                        isSearching = false;
                                        _update();
                                      });
                                    } else {
                                      _devices.clear();
                                      manager.forceSearch();
                                    }
                                    isSearching = true;
                                    _update();
                                  } else {
                                    manager.stopSearch();
                                    isSearching = false;
                                    _update();
                                  }
                                }),
                            Expanded(child: Container()),
                            IconButton(
                                icon: Icon(Icons.play_arrow, color: _btnColor),
                                onPressed: curDevice == null
                                    ? null
                                    : () {
                                        manager.actPlay();
                                      }),
                            IconButton(
                                icon: Icon(Icons.pause, color: _btnColor),
                                onPressed: curDevice == null
                                    ? null
                                    : () {
                                        manager.actPause();
                                      }),
                            IconButton(
                                icon: Icon(Icons.stop, color: _btnColor),
                                onPressed: curDevice == null
                                    ? null
                                    : () {
                                        manager.actStop();
                                      })
                          ],
                        ),
                      ),
                    )
                  ],
                );
              }),
            ),
          );
        });
  }

  static String _time2Str(int intTime) {
    var time = DateTime.fromMillisecondsSinceEpoch(intTime);
    return "${_formatInt(time.hour)}:${_formatInt(time.minute)}:${_formatInt(time.second)}";
  }

  static String _formatInt(int value) {
    return value.toString().padLeft(2, '0');
  }
}