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

import 'dart:io';

import 'package:cached_network_image/cached_network_image.dart';
import 'package:farm_tpf/custom_model/Media.dart';
import 'package:farm_tpf/presentation/custom_widgets/camera_helper.dart';
import 'package:farm_tpf/presentation/custom_widgets/widget_show_video.dart';
import 'package:farm_tpf/presentation/custom_widgets/widget_utils.dart';
import 'package:farm_tpf/presentation/screens/actions/util_action.dart';
import 'package:farm_tpf/utils/const_color.dart';
import 'package:farm_tpf/utils/const_common.dart';
import 'package:farm_tpf/utils/const_string.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:get/get.dart';

import 'bloc/media_helper_bloc.dart';
import 'hoz_list_view.dart';

class WidgetMediaPicker extends StatefulWidget {
  final List<Media> currentItems;
  final Function(List<String> addNewFilePaths, List<String> deleteFilePaths)
      onChangeFiles;
  WidgetMediaPicker({this.currentItems, @required this.onChangeFiles});
  @override
  _WidgetMediaPickerState createState() => _WidgetMediaPickerState();
}

class _WidgetMediaPickerState extends State<WidgetMediaPicker> {
  List<Media> currentItems = [];
  List<String> addNewFilePaths = new List<String>();
  List<String> deleteFilePaths = new List<String>();

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

  @override
  Widget build(BuildContext context) {
    return BlocProvider<MediaHelperBloc>(
        create: (BuildContext contextA) =>
            MediaHelperBloc()..add(ChangeListMedia(items: currentItems)),
        child: BlocBuilder<MediaHelperBloc, MediaHelperState>(
            builder: (contextB, state) {
          if (state is MediaHelperFailure) {
            return Container();
          } else if (state is MediaHelperSuccess) {
            currentItems = widget.currentItems ?? [];
            return Container(
                padding: EdgeInsets.only(top: 8, bottom: 8),
                child: Column(
                  children: <Widget>[
                    SizedBox(
                      width: double.infinity,
                      height: 44,
                      child: FlatButton(
                          onPressed: () {
                            showDialog(
                                context: context,
                                barrierDismissible: true,
                                builder: (context) => Opacity(
                                      child: multipleChoice(contextB),
                                      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),
                                )
                              ],
                            ),
                          )),
                    ),
                    SizedBox(
                      height: 8.0,
                    ),
                    Container(
                      child: _buildListPoster(),
                    ),
                  ],
                ));
          }
          return Container();
        }));
  }

  Widget multipleChoice(BuildContext context) {
    return CupertinoAlertDialog(
      title: Text(label_title_select_media),
      actions: <Widget>[
        CupertinoDialogAction(
            child: const Text(label_take_photo_or_video),
            onPressed: () {
              Navigator.pop(context, 'Discard');
              Navigator.of(context)
                  .push(MaterialPageRoute(builder: (context) => CameraHelper()))
                  .then((value) {
                if (value != null) {
                  print("ok");
                  print(value);
                  String filePath = value[0];
                  File f = File(filePath);
                  f.length().then((lengthFileInBytes) {
                    if (lengthFileInBytes > ConstCommon.kFileSize) {
                      Utils.showSnackBarWarning(message: label_file_to_large);
                    } else {
                      bool isVideo = value[1];
                      Media newMedia = Media()
                        ..isVideo = isVideo
                        ..isServerFile = false
                        ..pathFile = filePath;
                      currentItems.add(newMedia);
                      addNewFilePaths.add(filePath);
                      BlocProvider.of<MediaHelperBloc>(context)
                        ..add(ChangeListMedia(items: currentItems));
                      widget.onChangeFiles(addNewFilePaths, deleteFilePaths);
                    }
                  });
                }
              });
            }),
        CupertinoDialogAction(
            child: const Text(label_select_image_from_library),
            onPressed: () async {
              Navigator.pop(context, 'Discard');
              FilePickerResult result = await FilePicker.platform
                  .pickFiles(type: FileType.image, allowMultiple: true);
              if (result != null) {
                var listFuture = List<Future<File>>();
                result.files.forEach((element) {
                  listFuture.add(UtilAction.compressImage(File(element.path)));
                });
                Future.wait(listFuture).then((values) {
                  bool isExistedFileTooLarge = false;
                  values.forEach((compressFile) {
                    if (compressFile.lengthSync() > ConstCommon.kFileSize) {
                      isExistedFileTooLarge = true;
                    } else {
                      Media newMedia = Media()
                        ..isVideo = false
                        ..isServerFile = false
                        ..pathFile = compressFile.path;
                      currentItems.add(newMedia);
                      addNewFilePaths.add(compressFile.path);
                    }
                  });
                  if (isExistedFileTooLarge) {
                    Utils.showSnackBarWarning(
                        message: "Tập tin có kích thước lớn đã được loại bỏ.");
                  }
                  BlocProvider.of<MediaHelperBloc>(context)
                    ..add(ChangeListMedia(items: currentItems));
                  widget.onChangeFiles(addNewFilePaths, deleteFilePaths);
                });
              }
            }),
        CupertinoDialogAction(
            child: const Text(label_select_video_from_library),
            onPressed: () async {
              Navigator.pop(context, 'Discard');
              FilePickerResult result = await FilePicker.platform
                  .pickFiles(type: FileType.video, allowMultiple: true);

              if (result != null) {
                bool isExistedFileTooLarge = false;
                result.files?.forEach((videoFile) {
                  if (videoFile.size * 1000 > ConstCommon.kFileSize) {
                    isExistedFileTooLarge = true;
                  } else {
                    Media newMedia = Media()
                      ..isVideo = true
                      ..isServerFile = false
                      ..pathFile = videoFile.path;
                    currentItems.add(newMedia);
                    addNewFilePaths.add(videoFile.path);
                  }
                });
                if (isExistedFileTooLarge) {
                  Utils.showSnackBarWarning(
                      message: "Tập tin có kích thước lớn đã được loại bỏ.");
                }
                BlocProvider.of<MediaHelperBloc>(context)
                  ..add(ChangeListMedia(items: currentItems));
                widget.onChangeFiles(addNewFilePaths, deleteFilePaths);
              }
            }),
        CupertinoDialogAction(
            child: const Text(label_cancel),
            textStyle: TextStyle(fontWeight: FontWeight.bold),
            isDefaultAction: true,
            onPressed: () {
              Navigator.pop(context, 'Cancel');
            }),
      ],
    );
  }

  _buildListPoster() {
    return BlocBuilder<MediaHelperBloc, MediaHelperState>(
        builder: (context, state) {
      if (state is MediaHelperSuccess) {
        return GridView.count(
            physics: NeverScrollableScrollPhysics(),
            shrinkWrap: true,
            crossAxisCount: 4,
            children: currentItems.map(
              (item) {
                return _WidgetItemMedia(
                    item: item,
                    deleteImage: (item) {
                      if (item.isServerFile) {
                        var url = item.pathFile
                            .replaceAll(ConstCommon.baseImageUrl, '');
                        deleteFilePaths.add(url);
                      }
                      currentItems.remove(item);
                      widget.onChangeFiles(addNewFilePaths, deleteFilePaths);
                      BlocProvider.of<MediaHelperBloc>(context)
                          .add(ChangeListMedia(items: currentItems));
                    });
              },
            ).toList());
      }
      return Container();
    });
  }
}

class _WidgetItemMedia extends StatelessWidget {
  ItemMediaCallback deleteImage;
  final Media item;

  _WidgetItemMedia({@required this.item, @required this.deleteImage});

  BuildContext _context;
  // screenSize/rowGridview - iconSize - (rowGridview-1)*marginContainer
  // Get.width/4 - 24 - 3*4
  double positionIconDelete = -(Get.width / 4 - 36);

  @override
  Widget build(BuildContext context) {
    _context = context;
    return GestureDetector(
        onTap: () {
          print("Show preview image or video");
        },
        child: Stack(
          alignment: Alignment.topRight,
          overflow: Overflow.visible,
          children: <Widget>[
            Positioned.fill(
                child: item.isVideo
                    ? VideoWidget(
                        pathFile: item.pathFile,
                        isServerFile: item.isServerFile,
                        play: false,
                      )
                    : Container(
                        margin: EdgeInsets.all(4.0),
                        decoration: BoxDecoration(
                            color: Colors.white,
                            border: Border.all(color: Colors.grey),
                            borderRadius:
                                BorderRadius.all(Radius.circular(8.0))),
                        child: item.isServerFile
                            ? CachedNetworkImage(
                                placeholder: (context, url) =>
                                    Icon(Icons.crop_original),
                                imageUrl: item.pathFile)
                            : Image.file(File(item.pathFile)),
                      )),
            Positioned.fill(
              top: positionIconDelete,
              right: positionIconDelete,
              child: IconButton(
                  icon: Icon(
                    Icons.cancel,
                    color: Colors.redAccent,
                    size: 24,
                  ),
                  onPressed: () {
                    print("On tap delete media");
                    deleteImage(item);
                  }),
            )
          ],
        ));
  }
}

typedef ItemMediaCallback = void Function(Media item);