mobile-app/lib/presentation/custom_widgets/widget_media_helper.dart

import 'dart:io';
import 'dart:async';

import 'package:farm_tpf/presentation/custom_widgets/hoz_list_view.dart';
import 'package:farm_tpf/presentation/custom_widgets/shimmer_image.dart';
import 'package:farm_tpf/utils/const_color.dart';
import 'package:farm_tpf/utils/const_string.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:video_player/video_player.dart';

class WidgetMediaHelper extends StatefulWidget {
  @override
  _WidgetMediaHelperState createState() => _WidgetMediaHelperState();
}

class _WidgetMediaHelperState extends State<WidgetMediaHelper> {
  PickedFile _imageFile;
  dynamic _pickImageError;
  bool isVideo = false;
  VideoPlayerController _controller;
  VideoPlayerController _toBeDisposed;
  String _retrieveDataError;

  final ImagePicker _picker = ImagePicker();
  List<ItemMediaVM> items = [];

  @override
  Widget build(BuildContext context) {
    return Container(
        padding: EdgeInsets.all(8),
        child: Column(
          children: <Widget>[
            _actionButton(),
            SizedBox(
              height: 4.0,
            ),
            _buildListPoster(),
            defaultTargetPlatform == TargetPlatform.android
                ? FutureBuilder<void>(
                    future: retrieveLostData(),
                    builder:
                        (BuildContext context, AsyncSnapshot<void> snapshot) {
                      switch (snapshot.connectionState) {
                        case ConnectionState.none:
                        case ConnectionState.waiting:
                          return const Text(
                            'You have not yet picked an image.',
                            textAlign: TextAlign.center,
                          );
                        case ConnectionState.done:
                          return isVideo ? _previewVideo() : _previewImage();
                        default:
                          if (snapshot.hasError) {
                            return Text(
                              'Pick image/video error: ${snapshot.error}}',
                              textAlign: TextAlign.center,
                            );
                          } else {
                            return const Text(
                              'You have not yet picked an image.',
                              textAlign: TextAlign.center,
                            );
                          }
                      }
                    },
                  )
                : (isVideo ? _previewVideo() : _previewImage()),
          ],
        ));
  }

  _buildListPoster() {
    return WrapContentHozListView(
      itemBuilder: (context, index) {
        var item = items[index];
        return _WidgetItemMedia(item);
      },
      separatorBuilder: (context, index) {
        return SizedBox(width: 14);
      },
      list: items,
    );
  }

  Widget viewResult() {
    FutureBuilder<void>(
      future: retrieveLostData(),
      builder: (BuildContext context, AsyncSnapshot<void> snapshot) {
        switch (snapshot.connectionState) {
          case ConnectionState.none:
          case ConnectionState.waiting:
            return const Text(
              'You have not yet picked an image.',
              textAlign: TextAlign.center,
            );
          case ConnectionState.done:
            return isVideo ? _previewVideo() : _previewImage();
          default:
            if (snapshot.hasError) {
              return Text(
                'Pick image/video error: ${snapshot.error}}',
                textAlign: TextAlign.center,
              );
            } else {
              return const Text(
                'You have not yet picked an image.',
                textAlign: TextAlign.center,
              );
            }
        }
      },
    );
  }

  Widget multipleChoice() {
    return CupertinoAlertDialog(
      title: Text(label_title_select_media),
      actions: <Widget>[
        CupertinoDialogAction(
            child: const Text(label_select_image_from_library),
            onPressed: () {
              Navigator.pop(context, 'Discard');
              isVideo = false;
              _onImageButtonPressed(ImageSource.gallery, context: context);
            }),
        CupertinoDialogAction(
            child: const Text(label_take_photo),
            onPressed: () {
              Navigator.pop(context, 'Discard');
              isVideo = false;
              _onImageButtonPressed(ImageSource.camera, context: context);
            }),
        CupertinoDialogAction(
            child: const Text(label_select_video_from_library),
            onPressed: () {
              Navigator.pop(context, 'Discard');
              isVideo = true;
              _onImageButtonPressed(ImageSource.gallery);
            }),
        CupertinoDialogAction(
            child: const Text(label_record_video),
            onPressed: () {
              Navigator.pop(context, 'Discard');
              isVideo = true;
              _onImageButtonPressed(ImageSource.camera);
            }),
        CupertinoDialogAction(
            child: const Text(label_cancel),
            textStyle: TextStyle(fontWeight: FontWeight.bold),
            isDefaultAction: true,
            onPressed: () {
              Navigator.pop(context, 'Cancel');
            }),
      ],
    );
  }

  Widget _actionButton() {
    return SizedBox(
      width: double.infinity,
      height: 44,
      child: FlatButton(
          onPressed: () {
            showDialog(
                context: context,
                barrierDismissible: true,
                builder: (context) => Opacity(
                      child: multipleChoice(),
                      opacity: 1,
                    ));
          },
          color: COLOR_CONST.DEFAULT,
          shape: RoundedRectangleBorder(
            borderRadius: new BorderRadius.circular(7.0),
          ),
          child: Center(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Icon(Icons.image, color: Colors.white),
                SizedBox(
                  width: 8.0,
                ),
                Text(
                  button_add_media,
                  style: TextStyle(
                      fontWeight: FontWeight.bold, color: COLOR_CONST.WHITE),
                )
              ],
            ),
          )),
    );
  }

  Future<void> _playVideo(PickedFile file) async {
    if (file != null && mounted) {
      await _disposeVideoController();
      _controller = VideoPlayerController.file(File(file.path));
      await _controller.setVolume(1.0);
      await _controller.initialize();
      await _controller.setLooping(true);
      await _controller.play();
      setState(() {});
    }
  }

  void _onImageButtonPressed(ImageSource source, {BuildContext context}) async {
    if (_controller != null) {
      await _controller.setVolume(0.0);
    }
    if (isVideo) {
      final PickedFile file = await _picker.getVideo(
          source: source, maxDuration: const Duration(seconds: 10));
      await _playVideo(file);
    } else {
      await _displayPickImageDialog(context,
          (double maxWidth, double maxHeight, int quality) async {
        try {
          final pickedFile = await _picker.getImage(
            source: source,
            maxWidth: maxWidth,
            maxHeight: maxHeight,
            imageQuality: quality,
          );
          setState(() {
            _imageFile = pickedFile;
          });
        } catch (e) {
          setState(() {
            _pickImageError = e;
          });
        }
      });
    }
  }

  @override
  void deactivate() {
    if (_controller != null) {
      _controller.setVolume(0.0);
      _controller.pause();
    }
    super.deactivate();
  }

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

  Future<void> _disposeVideoController() async {
    if (_toBeDisposed != null) {
      await _toBeDisposed.dispose();
    }
    _toBeDisposed = _controller;
    _controller = null;
  }

  Widget _previewVideo() {
    final Text retrieveError = _getRetrieveErrorWidget();
    if (retrieveError != null) {
      return retrieveError;
    }
    if (_controller == null) {
      return const Text(
        'You have not yet picked a video',
        textAlign: TextAlign.center,
      );
    }
    return Padding(
      padding: const EdgeInsets.all(10.0),
      child: AspectRatioVideo(_controller),
    );
  }

  Widget _previewImage() {
    final Text retrieveError = _getRetrieveErrorWidget();
    if (retrieveError != null) {
      return retrieveError;
    }
    if (_imageFile != null) {
      var imageResult =
          Image.file(File(_imageFile.path), width: 100, height: 100);
      setState(() {
        items.insert(0, ItemMediaVM(_imageFile.path, false, imageResult));
      });
      return Container(
        child: Text("ok"),
      );
    } else if (_pickImageError != null) {
      return Text(
        'Pick image error: $_pickImageError',
        textAlign: TextAlign.center,
      );
    } else {
      return const Text(
        'You have not yet picked an image.',
        textAlign: TextAlign.center,
      );
    }
  }

  Future<void> retrieveLostData() async {
    final LostData response = await _picker.getLostData();
    if (response.isEmpty) {
      return;
    }
    if (response.file != null) {
      if (response.type == RetrieveType.video) {
        isVideo = true;
        await _playVideo(response.file);
      } else {
        isVideo = false;
        setState(() {
          _imageFile = response.file;
        });
      }
    } else {
      _retrieveDataError = response.exception.code;
    }
  }

  Text _getRetrieveErrorWidget() {
    if (_retrieveDataError != null) {
      final Text result = Text(_retrieveDataError);
      _retrieveDataError = null;
      return result;
    }
    return null;
  }

  Future<void> _displayPickImageDialog(
      BuildContext context, OnPickImageCallback onPick) async {
    onPick(null, null, null);
  }
}

typedef void OnPickImageCallback(
    double maxWidth, double maxHeight, int quality);

class AspectRatioVideo extends StatefulWidget {
  AspectRatioVideo(this.controller);

  final VideoPlayerController controller;

  @override
  AspectRatioVideoState createState() => AspectRatioVideoState();
}

class AspectRatioVideoState extends State<AspectRatioVideo> {
  VideoPlayerController get controller => widget.controller;
  bool initialized = false;

  void _onVideoControllerUpdate() {
    if (!mounted) {
      return;
    }
    if (initialized != controller.value.initialized) {
      initialized = controller.value.initialized;
      setState(() {});
    }
  }

  @override
  void initState() {
    super.initState();
    controller.addListener(_onVideoControllerUpdate);
  }

  @override
  void dispose() {
    controller.removeListener(_onVideoControllerUpdate);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (initialized) {
      return Container(
        width: 100,
        height: 100,
        child: AspectRatio(
          aspectRatio: controller.value?.aspectRatio,
          child: VideoPlayer(controller),
        ),
      );
    } else {
      return Container();
    }
  }
}

class _WidgetItemMedia extends StatelessWidget {
  final ItemMediaVM item;

  _WidgetItemMedia(this.item);

  BuildContext _context;

  @override
  Widget build(BuildContext context) {
    _context = context;
    return GestureDetector(
        onTap: () {
          print("Show preview image or video");
        },
        child: Stack(
          alignment: Alignment.bottomCenter,
          overflow: Overflow.visible,
          children: <Widget>[
            Positioned(
                child: ClipRRect(
              borderRadius: BorderRadius.circular(8),
              child: item.image == null
                  ? ShimmerImage(
                      item.photo,
                      width: 93,
                      height: 124,
                      fit: BoxFit.cover,
                    )
                  : Image.file(File(item.photo), width: 100, height: 100),
            )),
            Positioned(
              top: -5,
              right: -5,
              child: IconButton(
                  icon: Icon(
                    Icons.cancel,
                    color: Colors.redAccent,
                  ),
                  onPressed: () {
                    print("On tap delete media");
                  }),
            )
          ],
        ));
  }
}

class ItemMediaVM {
  String photo;
  bool isVideo;
  Image image;

  ItemMediaVM(this.photo, this.isVideo, this.image);
}