Widget Tata Letak Dasar
Kuasai widget tata letak penting seperti Row, Column, Container, dan Stack untuk membuat antarmuka pengguna yang terstruktur dan responsif.
Widget Tata Letak Dasar adalah pelajaran Flutter Mobile Development gratis di CoddyKit. Ini adalah pelajaran 2 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar Flutter Mobile Development, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus Flutter Mobile Development mencakup 4 pelajaran total.
Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.
Why Layouts Matter
In Flutter, everything is a widget! To build complex and beautiful user interfaces, you need to arrange these widgets on the screen.
Layout widgets are special widgets designed to help you organize other widgets, defining their size, position, and how they interact with each other.
Meet the Container
The Container widget is one of the most versatile layout widgets. Think of it as a customizable box that can hold a single child widget.
You can use it to:
- Add padding or margins
- Set background colors or decorations
- Define specific width and height
- Transform its position or rotation
Simple Colored Box
Let's create a basic Container with a child Text widget. Notice how we set its color and padding.
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Container Demo')),
body: Center(
child: Container(
padding: const EdgeInsets.all(20.0),
color: Colors.blueAccent,
child: const Text(
'Hello from Container!',
style: TextStyle(color: Colors.white, fontSize: 18),
),
),
),
),
);
}
}Horizontal with Row
When you need to arrange multiple widgets side-by-side horizontally, the Row widget is your go-to. It takes a list of widgets as its children.
Row automatically tries to fit its children along the horizontal axis, and you can control their alignment within the row.
Row of Buttons
Here's how you can place three buttons next to each other using a Row. We'll add some spacing between them.
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Row Demo')),
body: Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
ElevatedButton(onPressed: () {}, child: const Text('Button 1')),
ElevatedButton(onPressed: () {}, child: const Text('Button 2')),
ElevatedButton(onPressed: () {}, child: const Text('Button 3')),
],
),
),
),
);
}
}Vertical with Column
Just as Row arranges widgets horizontally, the Column widget arranges them vertically, one below the other.
It also takes a list of children and lets you control their vertical alignment.
Stacked Text Fields
Let's create a simple login-like form using a Column to stack two TextFields and a button vertically.
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Column Demo')),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Padding(
padding: EdgeInsets.all(8.0),
child: TextField(
decoration: InputDecoration(labelText: 'Username'),
),
),
const Padding(
padding: EdgeInsets.all(8.0),
child: TextField(
obscureText: true,
decoration: InputDecoration(labelText: 'Password'),
),
),
ElevatedButton(onPressed: () {}, child: const Text('Login')),
],
),
),
),
);
}
}Aligning Children
Both Row and Column use two important properties for alignment:
mainAxisAlignment: How children are positioned along the primary axis (horizontal forRow, vertical forColumn). Examples:start,center,end,spaceAround.crossAxisAlignment: How children are positioned along the perpendicular axis (vertical forRow, horizontal forColumn). Examples:start,center,end,stretch.
These give you fine control over your layouts!
Overlapping with Stack
Sometimes you need to place widgets on top of each other, like text over an image. That's where the Stack widget comes in.
Stack allows you to layer multiple children widgets. You can control their exact position within the stack using the Positioned widget.
Image with Text Overlay
Let's put some text directly on top of an image using a Stack. We'll use Positioned to place the text precisely.
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Stack Demo')),
body: Center(
child: SizedBox(
width: 300,
height: 200,
child: Stack(
children: <Widget>[
Image.network(
'https://picsum.photos/300/200',
fit: BoxFit.cover,
),
const Positioned(
bottom: 10,
left: 10,
child: Text(
'Beautiful Scenery',
style: TextStyle(
color: Colors.white,
fontSize: 20,
fontWeight: FontWeight.bold,
shadows: [
Shadow(blurRadius: 5, color: Colors.black)
],
),
),
),
],
),
),
),
),
);
}
}Layout Challenge
Which of the following widgets are primarily used for arranging multiple children widgets in a single direction (either horizontally or vertically)?
Layouts Mastered!
Great job! You've now mastered the fundamental layout widgets in Flutter:
Container: A versatile box for single children, offering padding, margin, color, and size control.Row: Arranges multiple children horizontally.Column: Arranges multiple children vertically.Stack: Layers children on top of each other, often used withPositioned.
Understanding these is key to building any Flutter UI!
Pertanyaan yang Sering Diajukan
Apakah pelajaran “Widget Tata Letak Dasar” gratis?
Ya — teks lengkap “Widget Tata Letak Dasar” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus Flutter Mobile Development, upgrade ke CoddyKit PRO. Kursus Flutter Mobile Development mencakup 4 pelajaran total.
Apa yang akan aku pelajari di “Widget Tata Letak Dasar”?
Kuasai widget tata letak penting seperti Row, Column, Container, dan Stack untuk membuat antarmuka pengguna yang terstruktur dan responsif. Kamu berlatih Flutter Mobile Development dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.
Apakah aku perlu pengalaman untuk memulai Flutter Mobile Development?
Tidak diperlukan pengalaman sebelumnya. Flutter Mobile Development di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 2 dari 4.
Berapa lama pelajaran “Widget Tata Letak Dasar” memakan waktu?
Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.
Bisakah aku menulis dan menjalankan kode dalam pelajaran Flutter Mobile Development ini?
Ya. Setiap pelajaran Flutter Mobile Development menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.
Semua pelajaran dalam kursus ini
- Widget Stateless vs. Stateful
- Widget Tata Letak Dasar
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