Initial commit: Flutter 无书应用项目

2026-03-30 02:35:31 +08:00
commit 9175ff9905
566 changed files with 103261 additions and 0 deletions
--- a/lib/widgets/tabbed_nav_app_bar.dart
+++ b/lib/widgets/tabbed_nav_app_bar.dart
@@ -0,0 +1,67 @@
+import 'package:flutter/material.dart';
+import '../constants/app_constants.dart';
+
+/// 时间: 2026-03-22
+/// 功能: 主导航内「标题 + Tab」共用 AppBar 构造
+/// 介绍: 压缩工具栏与 Tab 行高度，关闭 M3 卷动 surface tint，统一收藏页与发现页顶部观感
+/// 最新变化: 初始提取，减少两页相同结构的顶部留白
+
+/// 主导航子页（IndexedStack 内）带 [TabBar] 的页面共用 [AppBar] 配置
+class TabbedNavAppBar {
+  TabbedNavAppBar._();
+
+  static AppBar build({
+    required String title,
+    required TabController tabController,
+    required List<String> tabLabels,
+    List<Widget>? actions,
+    Widget? leading,
+    bool tabBarScrollable = false,
+    EdgeInsetsGeometry? tabPadding,
+    EdgeInsetsGeometry? tabLabelPadding,
+  }) {
+    return AppBar(
+      toolbarHeight: AppConstants.tabbedPageToolbarHeight,
+      title: Text(title, style: const TextStyle(fontWeight: FontWeight.bold)),
+      backgroundColor: Colors.white,
+      foregroundColor: Colors.black87,
+      iconTheme: const IconThemeData(color: Colors.black87),
+      elevation: 0,
+      scrolledUnderElevation: 0,
+      surfaceTintColor: Colors.transparent,
+      shadowColor: Colors.transparent,
+      centerTitle: true,
+      leading: leading,
+      actions: actions,
+      // 用 PreferredSize + 固定高度略小于默认 Tab 行，减少两页相同的「标题+Tab」总高度（当前 SDK 无 tabHeight 参数）
+      bottom: PreferredSize(
+        preferredSize: Size.fromHeight(AppConstants.tabbedPageTabBarHeight),
+        child: SizedBox(
+          height: AppConstants.tabbedPageTabBarHeight,
+          child: TabBar(
+            controller: tabController,
+            isScrollable: tabBarScrollable,
+            padding:
+                tabPadding ??
+                (tabBarScrollable
+                    ? const EdgeInsets.only(
+                        left: AppConstants.pageHorizontalPadding,
+                        right: 8,
+                      )
+                    : null),
+            labelPadding: tabLabelPadding,
+            tabAlignment: tabBarScrollable ? TabAlignment.start : null,
+            dividerHeight: 0,
+            dividerColor: Colors.transparent,
+            tabs: tabLabels.map((String e) => Tab(text: e)).toList(),
+            labelColor: AppConstants.primaryColor,
+            unselectedLabelColor: Colors.grey[600],
+            indicatorColor: AppConstants.primaryColor,
+            indicatorWeight: 3,
+            labelStyle: const TextStyle(fontWeight: FontWeight.bold),
+          ),
+        ),
+      ),
+    );
+  }
+}