fcs/lib/widget/multi_img_file.dart

import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:image_picker/image_picker.dart';
import 'package:fcs/widget/multi_img_controller.dart';
import 'package:fcs/widget/show_img.dart';

typedef OnFile = void Function(File);

class MultiImageFile extends StatefulWidget {
  final String title;
  final bool enabled;
  final ImageSource imageSource;
  final MultiImgController controller;

  const MultiImageFile(
      {Key key,
      this.title,
      this.enabled = true,
      this.controller,
      this.imageSource = ImageSource.gallery})
      : super(key: key);
  @override
  _MultiImageFileState createState() => _MultiImageFileState();
}

class _MultiImageFileState extends State<MultiImageFile> {
  List<FileContainer> fileContainers = [];
  @override
  void initState() {
    super.initState();
    fileContainers = widget.controller.fileContainers;
    widget.controller.onChange(() {
      setState(() {
        this.fileContainers = widget.controller.fileContainers;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return new Column(
      children: new List.generate(
          widget.enabled ? fileContainers.length : fileContainers.length - 1,
          (i) => getFile(fileContainers[i], i)).toList(),
    );

    // return Container(
    //   height: 30,
    //   width: 100,
    //   child: ListView.builder(
    //     itemCount: fileContainers.length,
    //     itemBuilder: (context, i) {
    //       return getFile(fileContainers[i]);
    //     },
    //   ),
    // );
  }

  _fileAdded(FileContainer fileContainer, File selectedFile) {
    fileContainer.file = selectedFile;
    setState(() {
      widget.controller.addFile = fileContainer;
    });
  }

  _fileRemove(FileContainer fileContainer) {
    setState(() {
      widget.controller.removeFile = fileContainer;
    });
  }

  Widget getFile(FileContainer fileContainer, int index) {
    return Container(
      height: 40,
      padding: EdgeInsets.only(top: 5, bottom: 5),
      child: fileContainer.file == null && fileContainer.url == null
          ? IconButton(
              padding: const EdgeInsets.all(3.0),
              icon: Icon(Icons.attach_file),
              onPressed: () async {
                if (!widget.enabled) return;
                bool camera = false, gallery = false;
                await _dialog(
                    context, () => camera = true, () => gallery = true);
                if (camera || gallery) {
                  var selectedFile = await ImagePicker.pickImage(
                      source: camera ? ImageSource.camera : ImageSource.gallery,
                      imageQuality: 80,
                      maxWidth: 1000);
                  if (selectedFile != null) {
                    _fileAdded(fileContainer, selectedFile);
                  }
                }
              },
            )
          : Padding(
              padding: const EdgeInsets.only(left: 3.0),
              child: InkWell(
                onTap: () => {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                        builder: (context) => ShowImage(
                            imageFile: fileContainer.file,
                            url: fileContainer.file == null
                                ? fileContainer.url
                                : null,
                            fileName: widget.title)),
                  )
                },
                child: Chip(
                  avatar: Icon(Icons.image),
                  onDeleted: !widget.enabled
                      ? null
                      : () {
                          _fileRemove(fileContainer);
                        },
                  deleteIcon: Icon(
                    Icons.close,
                  ),
                  label: Text(widget.title + " - ${index + 1}"),
                ),
              ),
            ),
    );
  }

  Future<void> _dialog(BuildContext context, cameraPress(), photoPress()) {
    return showDialog<void>(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          content: Container(
            child: Padding(
              padding: const EdgeInsets.all(8.0),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: <Widget>[
                  Column(
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      IconButton(
                          icon: Icon(
                            FontAwesomeIcons.camera,
                            size: 30,
                          ),
                          onPressed: () {
                            Navigator.pop(context);
                            cameraPress();
                          }),
                      Text("Camera")
                    ],
                  ),
                  Column(
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      IconButton(
                          icon: Icon(Icons.photo_library, size: 30),
                          onPressed: () {
                            Navigator.pop(context);
                            photoPress();
                          }),
                      Text("Gallery")
                    ],
                  ),
                ],
              ),
            ),
          ),
        );
      },
    );
  }
}

class FileContainer {
  String url;
  File file;
  FileContainer({this.url, this.file});

  @override
  bool operator ==(other) {
    if (identical(this, other)) {
      return true;
    }
    return (other.file == this.file &&
            (other.file != null || this.file != null)) ||
        (other.url == this.url && (other.url != null || this.url != null));
  }

  @override
  int get hashCode {
    int result = 17;
    result = 37 * result + file.hashCode;
    return result;
  }
}