fcs/lib/widget/multi_img_controller.dart

import 'dart:io';

import 'package:fcs/widget/multi_img_file.dart';

typedef CallBack = void Function();

class MultiImgController {
  List<String> imageUrls;
  List<FileContainer> addedFiles = [];
  List<FileContainer> removedFiles = [];

  List<FileContainer> fileContainers = [];
  CallBack callback;
  MultiImgController() {
    fileContainers = [FileContainer()];
  }

  set setImageUrls(List<String> imageUrls) {
    if (imageUrls == null) {
      fileContainers.add(FileContainer());
      return;
    }
    fileContainers.clear();

    this.imageUrls = imageUrls;
    imageUrls.forEach((e) {
      fileContainers.add(FileContainer(url: e));
    });
    fileContainers.add(FileContainer());
    if (callback != null) {
      callback();
    }
  }

  void onChange(CallBack callBack) {
    this.callback = callBack;
  }

  set addFile(FileContainer fileContainer) {
    // if (fileContainers.contains(fileContainer)) return;
    addedFiles.add(fileContainer);
    fileContainers.add(FileContainer());
    if (callback != null) {
      callback();
    }
  }

  set removeFile(FileContainer fileContainer) {
    if (!fileContainers.contains(fileContainer)) return;
    fileContainers.remove(fileContainer);

    if (addedFiles.contains(fileContainer)) {
      addedFiles.remove(fileContainer);
    }
    if (imageUrls.contains(fileContainer.url)) {
      removedFiles.add(fileContainer);
    }
    if (callback != null) {
      callback();
    }
  }

  List<File> get getAddedFile {
    return addedFiles.map((e) => e.file).toList();
  }

  List<String> get getDeletedUrl {
    return removedFiles.map((e) => e.url).toList();
  }
}