add structure

lib/widget/multi_img_controller.dart

@@ -0,0 +1,70 @@
+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();
+  }
+}