Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

wrapping Scaffold with Container for gradient background, How to set gradient to container background in flutter?

I'd like to wrap a Scaffold with a Container in order to get a gradient background that's also underneath the AppBar. Basically a full screen gradient background. However, my attempt doesn't do anything. Is there another way of doing it, where I can keep the AppBar functionality but have it on top of a gradient that spans the whole screen?

import 'package:flutter/material.dart';  void main() => runApp(MyApp());  class MyApp extends StatelessWidget {   @override   Widget build(BuildContext context) {     return MaterialApp(       title: 'Test',       theme: ThemeData(         primarySwatch: Colors.yellow,       ),       home: MyHomePage(title: 'Test'),     );   } }  class MyHomePage extends StatelessWidget {   MyHomePage({Key key, this.title}) : super(key: key);    final String title;    @override   Widget build(BuildContext context) {     return Container(       decoration: BoxDecoration(         gradient: LinearGradient(           begin: Alignment.topRight,           end: Alignment.bottomLeft,           stops: [0.1, 0.5, 0.7, 0.9],           colors: [             Colors.yellow[800],             Colors.yellow[700],             Colors.yellow[600],             Colors.yellow[400],           ],         ),       ),       child: Scaffold(         appBar: AppBar(           title: Icon(Icons.menu),           backgroundColor: Color(0x00000000),           elevation: 0.0,         ),         body: Center(           child: Column(             mainAxisAlignment: MainAxisAlignment.center,             children: <Widget>[               Text(                 'dummy text',               ),               Text(                 '5',                 style: Theme.of(context).textTheme.display1,               ),               FloatingActionButton(                 backgroundColor: Colors.white,                 foregroundColor: Colors.black45,                 elevation: 0.0,                 onPressed: () {},                 tooltip: 'Play',                 child: Icon(Icons.play_arrow),               ),             ],           ),         ),       ),     );   } } 
like image 908
dan Avatar asked Nov 21 '18 09:11

dan


2 Answers

You can also add a gradient to the AppBar like this,

awesome app bar preview

new Scaffold(       appBar: AppBar(         title: Center(child: Text('Awesome AppBar')),         flexibleSpace: Container(           decoration: BoxDecoration(             gradient: LinearGradient(                 colors: [                   const Color(0xFF3366FF),                   const Color(0xFF00CCFF),                 ],                 begin: const FractionalOffset(0.0, 0.0),                 end: const FractionalOffset(1.0, 0.0),                 stops: [0.0, 1.0],                 tileMode: TileMode.clamp),           ),         ),         child: ...,       ),       body: ...,     ); 

LinearGradient parameters:

  • colors: an array of the colors to be used in the gradient, in this case, two shades of blue.

  • begin, end: position of the first color and the last color, in this case,

  • FractionalOffset allows us to treat the coordinates as a range from 0 to 1 both for x and y. As we want an horizontal gradient, we use same Y for both measures, and the x changes from 0.0 (left) to 1.0 (right).

  • stops: this array should have the same size than colors. It defines how the colors will distribute. [0.0, 1.0] will fill it from left to right. [0.0, 0.5] will fill the colors from left to half bar, etc.

  • tileMode: what to do if the stops do not fill the whole area. In this case, we added clamp (it will reuse the last color used), but as our gradient goes from 0.0 to 1.0, it’s not really necessary.

  • You can also add a child to the Container. e.g: some logo image

        child: Align(           alignment: Alignment.center,           child: Image.asset(             "images/logo.png",             width: 128,             height: 128,           )),     ), 

Hope this helps.

like image 174
tharindu_DG Avatar answered Sep 22 '22 14:09

tharindu_DG


In Your Code - Under Scaffold add - backgroundColor: Colors.transparent,

child: Scaffold(         backgroundColor: Colors.transparent,         appBar: AppBar(         .. 
like image 30
anmol.majhail Avatar answered Sep 23 '22 14:09

anmol.majhail