feat: later page: multi select

feat: fav detail page: multi select

opt: reply item

opt: load more

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/common/multi_select_controller.dart

@@ -0,0 +1,31 @@
+import 'package:PiliPalaX/http/loading_state.dart';
+import 'package:PiliPalaX/pages/common/common_controller.dart';
+import 'package:get/get.dart';
+import 'package:PiliPalaX/utils/extension.dart';
+
+abstract class MultiSelectController extends CommonController {
+  RxBool enableMultiSelect = false.obs;
+  RxInt checkedCount = 0.obs;
+
+  onSelect(int index) {
+    List list = (loadingState.value as Success).response;
+    list[index].checked = !list[index].checked;
+    checkedCount.value = list.where((item) => item.checked).length;
+    loadingState.value = LoadingState.success(list);
+    if (checkedCount.value == 0) {
+      enableMultiSelect.value = false;
+    }
+  }
+
+  void handleSelect([bool checked = false]) {
+    List? list = (loadingState.value as Success?)?.response;
+    if (list.isNullOrEmpty.not) {
+      loadingState.value = LoadingState.success(
+          list!.map((item) => item..checked = checked).toList());
+      checkedCount.value = checked ? list.length : 0;
+    }
+    if (checked.not) {
+      enableMultiSelect.value = false;
+    }
+  }
+}