add homepage

lib/base/base_state_widget.dart

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+import 'package:flutter/cupertino.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'base_viewmodel.dart';
+
+class BaseStateWidget<T extends BaseViewModel> extends ConsumerStatefulWidget {
+  final Widget Function(BuildContext context, T value, Widget? child) builder;
+  final ProviderBase<T> model;
+  final Widget? child;
+  final Function(T)? onReady;
+
+  const BaseStateWidget({
+    Key? key,
+    required this.builder,
+    required this.model,
+    this.child,
+    this.onReady,
+  }) : super(key: key);
+
+  @override
+  _BaseStateWidgetState<T> createState() => _BaseStateWidgetState<T>();
+}
+
+class _BaseStateWidgetState<T extends BaseViewModel> extends ConsumerState<BaseStateWidget<T>> {
+  @override
+  void initState() {
+    super.initState();
+    if (widget.onReady != null) {
+      widget.onReady!(ref.read<T>(widget.model));
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    var viewModel = ref.watch<T>(widget.model);
+    if (viewModel.currentState == PageState.CONTENT) {
+      return widget.builder(context, viewModel, widget.child);
+    }
+
+    if (viewModel.currentState == PageState.LOADING) {
+      return Container(
+        alignment: Alignment.center,
+        child: const CupertinoActivityIndicator(),
+      );
+    }
+
+    if (viewModel.currentState == PageState.FAILED) {
+      return Container(
+        alignment: Alignment.center,
+        child: Text("请求失败"),
+      );
+    }
+
+    if (viewModel.currentState == PageState.EMPTY) {
+      return Container(
+        alignment: Alignment.center,
+        child: Text("暂无数据"),
+      );
+    }
+
+    return Container();
+  }
+}
+
+abstract class BaseState<T extends StatefulWidget> extends State {
+  late T parent;
+
+  @override
+  void initState() {
+    parent = widget as T;
+    super.initState();
+    WidgetsBinding.instance?.endOfFrame.then((_) {
+      firstFrameCalled();
+    });
+  }
+
+  void firstFrameCalled() {}
+
+  @override
+  Widget build(BuildContext context) {
+    return buildWidgets(context);
+  }
+
+  Widget buildWidgets(BuildContext context);
+}

lib/base/base_viewmodel.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/cupertino.dart';
+
+class BaseViewModel extends ChangeNotifier {
+  PageState currentState = PageState.START;
+
+  void loading({bool notify = false}) {
+    currentState = PageState.LOADING;
+    if (notify) {
+      notifyListeners();
+    }
+  }
+
+  void success({bool notify = true}) {
+    currentState = PageState.CONTENT;
+    if (notify) {
+      notifyListeners();
+    }
+  }
+
+  void failed({bool notify = false}) {
+    currentState = PageState.FAILED;
+    if (notify) {
+      notifyListeners();
+    }
+  }
+
+  void empty({bool notify = false}) {
+    currentState = PageState.EMPTY;
+    if (notify) {
+      notifyListeners();
+    }
+  }
+}
+
+enum PageState {
+  START,
+  LOADING,
+  EMPTY,
+  CONTENT,
+  FAILED,
+}

lib/base/ql_app_bar.dart

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+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+class QlAppBar extends StatelessWidget with PreferredSizeWidget {
+  final String title;
+  final List<Widget>? actions;
+  final VoidCallback? backCall;
+  final bool canBack;
+  final Widget? backWidget;
+
+  QlAppBar({
+    Key? key,
+    required this.title,
+    this.actions,
+    this.backCall,
+    this.canBack = true,
+    this.backWidget,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    Widget back = backWidget ??
+        GestureDetector(
+          onTap: () {
+            if (backCall != null) {
+              backCall!();
+            }
+          },
+          child: const Center(
+            child: Icon(
+              CupertinoIcons.left_chevron,
+              size: 20,
+            ),
+          ),
+        );
+
+    return AppBar(
+      leading: canBack ? back : null,
+      automaticallyImplyLeading: canBack,
+      title: Text(title),
+      centerTitle: true,
+      actions: [...?actions],
+    );
+  }
+
+  @override
+  Size get preferredSize => const Size.fromHeight(kToolbarHeight);
+}

lib/base/theme.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+var themeProvider = ChangeNotifierProvider((ref) => ThemeViewModel());
+
+class ThemeViewModel extends ChangeNotifier {
+  ThemeData currentTheme = lightTheme;
+
+  void changeTheme() {
+    if (currentTheme == darkTheme) {
+      currentTheme = lightTheme;
+    } else {
+      currentTheme = darkTheme;
+    }
+    notifyListeners();
+  }
+}
+
+ThemeData darkTheme = ThemeData.dark().copyWith();
+ThemeData lightTheme = ThemeData.light().copyWith();