Added the project

lib/src/widgets/nav_bar.dart

@@ -0,0 +1,100 @@
+import 'package:cake_wallet/theme_changer.dart';
+import 'package:cake_wallet/themes.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class NavBar extends StatelessWidget implements ObstructingPreferredSizeWidget {
+  static const _originalHeight = 44.0; // iOS nav bar height
+  static const _height = 60.0;
+
+  factory NavBar.withShadow(
+      {BuildContext context,
+      Widget leading,
+      Widget middle,
+      Widget trailing,
+      Color backgroundColor}) {
+    final _themeChanger = Provider.of<ThemeChanger>(context);
+    final _isDarkTheme = _themeChanger.getTheme() == Themes.darkTheme;
+
+    return NavBar._internal(
+      leading: leading,
+      middle: middle,
+      trailing: trailing,
+      height: 80,
+      backgroundColor:
+          _isDarkTheme ? Theme.of(context).backgroundColor : backgroundColor,
+      decoration: BoxDecoration(
+          color: _isDarkTheme
+              ? Theme.of(context).backgroundColor
+              : backgroundColor,
+          boxShadow: [
+            BoxShadow(
+                color: Color.fromRGBO(132, 141, 198, 0.11),
+                blurRadius: 8,
+                offset: Offset(0, 2))
+          ]),
+    );
+  }
+
+  factory NavBar(
+      {BuildContext context,
+      Widget leading,
+      Widget middle,
+      Widget trailing,
+      Color backgroundColor}) {
+    final _themeChanger = Provider.of<ThemeChanger>(context);
+    final _isDarkTheme = _themeChanger.getTheme() == Themes.darkTheme;
+
+    return NavBar._internal(
+        leading: leading,
+        middle: middle,
+        trailing: trailing,
+        height: _height,
+        backgroundColor:
+            _isDarkTheme ? Theme.of(context).backgroundColor : backgroundColor);
+  }
+
+  final Widget leading;
+  final Widget middle;
+  final Widget trailing;
+  final Color backgroundColor;
+  final BoxDecoration decoration;
+  final double height;
+
+  NavBar._internal(
+      {this.leading,
+      this.middle,
+      this.trailing,
+      this.backgroundColor,
+      this.decoration,
+      this.height = _height});
+
+  @override
+  Widget build(BuildContext context) {
+    final pad = height - _originalHeight;
+    final paddingTop = pad / 2;
+    final _paddingBottom = (pad / 2);
+
+    return Container(
+      decoration: decoration ?? BoxDecoration(color: backgroundColor),
+      padding:
+          EdgeInsetsDirectional.only(bottom: _paddingBottom, top: paddingTop),
+      child: CupertinoNavigationBar(
+        leading: leading,
+        middle: middle,
+        trailing: trailing,
+        backgroundColor: backgroundColor,
+        border: null,
+      ),
+    );
+  }
+
+  @override
+  Size get preferredSize => Size.fromHeight(height);
+
+  @override
+  bool shouldFullyObstruct(BuildContext context) {
+    return false;
+  }
+}