main.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';

void main() => runApp(MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MainScreen(),
    ));

class MainScreen extends StatefulWidget {
  @override
  _MainScreenState createState() => _MainScreenState();
}

class _MainScreenState extends State<MainScreen>
    with SingleTickerProviderStateMixin {
  bool isLeftCollapsed = true;
  bool isRightCollapsed = true;
  bool isTopCollapsed = true;
  bool isBottomCollapsed = true;
  double screenWidth, screenHeight;
  final Duration duration = const Duration(milliseconds: 300);
  AnimationController _controller;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(vsync: this, duration: duration);
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    screenHeight = size.height;
    screenWidth = size.width;

    return Scaffold(
      body: Stack(
        children: <Widget>[
          upperBar(),
          sideBar(),
          bottomBar(),
          AnimatedPositioned(
              left: isLeftCollapsed ? 0 : 0.5 * screenWidth,
              right: isRightCollapsed ? 0 : -0.2 * screenWidth,
              top: isTopCollapsed ? 0 : 0.1 * screenHeight,
              bottom: isBottomCollapsed ? 0 : 0.1 * screenHeight,
              duration: duration,
              child: dashboard(context)),
        ],
      ),
    );
  }

  Widget bottomBar() {
    return Positioned(
        bottom: 10,
        left: 30,
        child: Row(
          children: [
            Text(
              "Reset Password",
              style: TextStyle(color: Colors.grey, fontSize: 25),
            ),
            SizedBox(
              width: 60,
            ),
            Container(
              width: 100,
              height: 40,
              child: Center(
                  child: Text(
                "Log Out",
                style:
                    TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
              )),
              decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(10), color: Colors.blue),
            )
          ],
        ));
  }

  Widget sideBar() {
    return Positioned(
        left: 30,
        top: 250,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              "Home",
              style: TextStyle(
                  fontWeight: FontWeight.bold,
                  color: Colors.blue,
                  fontSize: 25),
            ),
            SizedBox(
              height: 10,
            ),
            Text(
              "My Account",
              style: TextStyle(
                  fontWeight: FontWeight.bold,
                  color: Colors.blue,
                  fontSize: 25),
            ),
            SizedBox(
              height: 10,
            ),
            Text(
              "My Orders",
              style: TextStyle(
                  fontWeight: FontWeight.bold,
                  color: Colors.blue,
                  fontSize: 25),
            ),
            SizedBox(
              height: 10,
            ),
            Text(
              "Settings",
              style: TextStyle(
                  fontWeight: FontWeight.bold,
                  color: Colors.blue,
                  fontSize: 25),
            ),
          ],
        ));
  }

  Widget upperBar() {
    return Positioned(
        top: 40,
        left: 30,
        child: Row(
          children: [
            CircleAvatar(
              child: Icon(Icons.person_outline),
            ),
            SizedBox(
              width: 10,
            ),
            Text(
              "User name",
              style: TextStyle(fontSize: 25, fontWeight: FontWeight.bold),
            ),
            SizedBox(
              width: 80,
            ),
            Container(
              width: 100,
              height: 40,
              child: Center(
                  child: Text(
                "View Profile",
                style:
                    TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
              )),
              decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(10), color: Colors.blue),
            )
          ],
        ));
  }

  Widget dashboard(context) {
    return SafeArea(
      child: Material(
        type: MaterialType.card,
        animationDuration: duration,
        elevation: 8,
        child: Scaffold(
          appBar: AppBar(
            elevation: 0,
            title: Text('MarketWatch'),
            actions: [
              IconButton(
                icon: isTopCollapsed
                    ? Icon(
                        Icons.keyboard_arrow_down_outlined,
                        size: 40,
                        color: Colors.white,
                      )
                    : Icon(
                        Icons.keyboard_arrow_up_outlined,
                        size: 40,
                        color: Colors.white,
                      ),
                onPressed: () {
                  setState(() {
                    isTopCollapsed
                        ? _controller.forward()
                        : _controller.reverse();
                    isTopCollapsed = !isTopCollapsed;
                  });
                },
              )
            ],
            leading: IconButton(
                icon: isLeftCollapsed ? Icon(Icons.menu) : Icon(Icons.clear),
                onPressed: () {
                  setState(() {
                    if (isLeftCollapsed) {
                      _controller.forward();
                    } else {
                      _controller.reverse();
                    }
                    isTopCollapsed = !isTopCollapsed;
                    isLeftCollapsed = !isLeftCollapsed;
                    isBottomCollapsed = !isBottomCollapsed;
                  });
                }),
          ),
          floatingActionButton: FloatingActionButton(
            onPressed: () {
              setState(() {
                isBottomCollapsed
                    ? _controller.forward()
                    : _controller.reverse();
                isBottomCollapsed = !isBottomCollapsed;
              });
            },
            child: isBottomCollapsed
                ? Icon(
                    Icons.keyboard_arrow_up_outlined,
                    size: 40,
                  )
                : Icon(
                    Icons.keyboard_arrow_down_outlined,
                    size: 40,
                  ),
          ),
        ),
      ),
    );
  }
}