add homepage

lib/base/ql_app_bar.dart

@@ -0,0 +1,48 @@
+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);
+}