refactor : 问题页悬浮按钮

lib/modules/problem/views/problem_page.dart

@@ -1,4 +1,3 @@
-// problem_page.dart
 import 'package:flutter/material.dart';
 import 'package:flutter_screenutil/flutter_screenutil.dart';
 import 'package:get/get.dart';
@@ -8,12 +7,11 @@ import 'package:problem_check_system/modules/problem/views/widgets/date_picker_b
 import 'package:problem_check_system/modules/problem/views/widgets/problem_card.dart';
 import 'package:problem_check_system/modules/problem/views/problem_form_page.dart';
 
-class ProblemPage extends StatelessWidget {
+class ProblemPage extends GetView<ProblemController> {
   const ProblemPage({super.key});
 
   @override
   Widget build(BuildContext context) {
-    final ProblemController problemController = Get.find<ProblemController>();
     return DefaultTabController(
       initialIndex: 0,
       length: 2,
@@ -74,58 +72,44 @@ class ProblemPage extends StatelessWidget {
                           ),
                         ),
                         Expanded(
-                          child: Stack(
-                            children: [
-                              Obx(() {
-                                if (problemController.isLoading.value) {
-                                  return Center(
-                                    child: CircularProgressIndicator(),
-                                  );
+                          child: Obx(() {
+                            if (controller.isLoading.value) {
+                              return Center(child: CircularProgressIndicator());
+                            }
+
+                            return ListView.builder(
+                              // +1 是为了在列表末尾添加一个额外的“空”项
+                              itemCount: controller.problems.length + 1,
+                              itemBuilder: (context, index) {
+                                // 如果是最后一个“空”项，返回一个 SizedBox
+                                if (index == controller.problems.length) {
+                                  return SizedBox(height: 79.5.h);
                                 }
 
-                                return ListView.builder(
-                                  itemCount: problemController.problems.length,
-                                  itemBuilder: (context, index) {
-                                    final problem =
-                                        problemController.problems[index];
-                                    return _buildSwipeableProblemCard(
-                                      problem,
-                                      problemController,
-                                    );
-                                  },
+                                // 否则，返回正常的列表项
+                                final problem = controller.problems[index];
+                                return _buildSwipeableProblemCard(
+                                  problem,
+                                  controller,
                                 );
-                              }),
-                              Positioned(
-                                bottom: 5.h,
-                                right: 160.5.w,
-                                child: FloatingActionButton(
-                                  heroTag: "123",
-                                  onPressed: () {
-                                    Get.to(() => ProblemFormPage());
-                                  },
-                                  shape: CircleBorder(),
-                                  backgroundColor: Colors.blue[300],
-                                  foregroundColor: Colors.white,
-                                  child: const Icon(Icons.add),
-                                ),
-                              ),
-                            ],
-                          ),
+                              },
+                            );
+                          }),
                         ),
                       ],
                     ),
                     Obx(() {
-                      if (problemController.isLoading.value) {
+                      if (controller.isLoading.value) {
                         return Center(child: CircularProgressIndicator());
                       }
 
                       return ListView.builder(
-                        itemCount: problemController.problems.length,
+                        itemCount: controller.problems.length,
                         itemBuilder: (context, index) {
-                          final problem = problemController.problems[index];
+                          final problem = controller.problems[index];
                           return _buildSwipeableProblemCard(
                             problem,
-                            problemController,
+                            controller,
                             viewType: ProblemCardViewType.checkbox,
                           );
                         },
@@ -137,20 +121,46 @@ class ProblemPage extends StatelessWidget {
             ],
           ),
         ),
-        floatingActionButton: Obx(() {
-          final bool isOnline = problemController.isOnline.value;
-          return FloatingActionButton(
-            heroTag: "abc",
-            onPressed: isOnline
-                ? () => problemController.uploadAllUnuploaded()
-                : null,
-            foregroundColor: Colors.white,
-            backgroundColor: isOnline ? Colors.red[300] : Colors.grey[400],
-            child: Icon(
-              isOnline ? Icons.file_upload_outlined : Icons.cloud_off_outlined,
+        floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
+        floatingActionButton: Stack(
+          children: [
+            Align(
+              alignment: Alignment.bottomCenter,
+              child: FloatingActionButton(
+                heroTag: "btn_add",
+                onPressed: () {
+                  Get.to(() => ProblemFormPage());
+                },
+                shape: CircleBorder(),
+                backgroundColor: Colors.blue[300],
+                foregroundColor: Colors.white,
+                child: const Icon(Icons.add),
+              ),
             ),
-          );
-        }),
+            Positioned(
+              bottom: 56.h, // 设置距离底部100像素
+              right: 27.w, // 设置距离右侧16像素（通常的浮动按钮默认位置）
+              child: Obx(() {
+                final bool isOnline = controller.isOnline.value;
+                return FloatingActionButton(
+                  heroTag: "btn_upload",
+                  onPressed: isOnline
+                      ? () => controller.uploadAllUnuploaded()
+                      : null,
+                  foregroundColor: Colors.white,
+                  backgroundColor: isOnline
+                      ? Colors.red[300]
+                      : Colors.grey[400],
+                  child: Icon(
+                    isOnline
+                        ? Icons.file_upload_outlined
+                        : Icons.cloud_off_outlined,
+                  ),
+                );
+              }),
+            ),
+          ],
+        ),
       ),
     );
   }