feat: flutter ui integration

ui/flutter/lib/pages/task/task_controller.dart

@@ -0,0 +1,70 @@
+import 'dart:async';
+
+import 'package:get/get.dart';
+import 'package:gopeed/api/model/task.dart';
+import 'package:gopeed/core/libgopeed_boot.dart';
+
+import '../../api/api.dart';
+
+class TaskController extends GetxController {
+  final tabIndex = 0.obs;
+  final unDoneTasks = <Task>[].obs;
+  final doneTasks = <Task>[].obs;
+
+  var _lastUnDoneSize = 0;
+  var _lastDoneSize = 0;
+
+  late final Timer _timer;
+
+  _loadUnDone() async {
+    unDoneTasks.value = await getTasks(
+        [Status.ready, Status.running, Status.pause, Status.error]);
+    final lastLastSize = _lastUnDoneSize;
+    if (lastLastSize != unDoneTasks.length) {
+      _lastUnDoneSize = unDoneTasks.length;
+    }
+    // when unDoneTasks.length reduce, it means some task is done, refresh doneTasks
+    return lastLastSize > _lastUnDoneSize;
+  }
+
+  _loadDone() async {
+    doneTasks.value = await getTasks([Status.done]);
+    final lastLastSize = _lastDoneSize;
+    if (lastLastSize != doneTasks.length) {
+      _lastDoneSize = doneTasks.length;
+    }
+    // when doneTasks.length increase, it means some task is done, refresh unDoneTasks
+    return lastLastSize < _lastDoneSize;
+  }
+
+  loadTab() async {
+    if (tabIndex.value == 0) {
+      if (await _loadUnDone()) {
+        await _loadDone();
+      }
+    } else {
+      if (await _loadDone()) {
+        await _loadUnDone();
+      }
+    }
+  }
+
+  @override
+  void onInit() {
+    super.onInit();
+
+    loadTab();
+    _timer = Timer.periodic(
+        Duration(milliseconds: LibgopeedBoot.instance.refreshInterval),
+        (timer) async {
+      loadTab();
+    });
+  }
+
+  @override
+  void onClose() {
+    super.onClose();
+
+    _timer.cancel();
+  }
+}