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in terms of how they handle their constraints:
some widgets, for example container,
vary from type to type based on their constructor arguments.
the container constructor defaults
to trying to be as big as possible, but if you give it a width,
for instance, it tries to honor that and be that particular size.
others, for example row and column (flex boxes)
vary based on the constraints they are given,
as described in the flex section.
<topic_end>
<topic_start>
examples
for an interactive experience, use the following DartPad.
use the numbered horizontal scrolling bar to switch between
29 different examples.
<code_start>
import 'package:flutter/material.dart';
void main() => runApp(const HomePage());
const red = colors.red;
const green = colors.green;
const blue = colors.blue;
const big = TextStyle(fontSize: 30);
//////////////////////////////////////////////////
class HomePage extends StatelessWidget {
const HomePage({super.key});
@override
widget build(BuildContext context) {
return const FlutterLayoutArticle([
example1(),
example2(),
example3(),
example4(),
example5(),
example6(),
example7(),
example8(),
example9(),
example10(),
example11(),
example12(),
example13(),
example14(),
example15(),
example16(),
example17(),
example18(),
example19(),
example20(),
example21(),
example22(),
example23(),
example24(),
example25(),
example26(),
example27(),
example28(),
example29(),
]);
}
}
//////////////////////////////////////////////////
abstract class example extends StatelessWidget {
const example({super.key});
string get code;
string get explanation;
}
//////////////////////////////////////////////////
class FlutterLayoutArticle extends StatefulWidget {
const FlutterLayoutArticle(
this.examples, {
super.key,
});
final List<Example> examples;
@override
State<FlutterLayoutArticle> createState() => _FlutterLayoutArticleState();
}
//////////////////////////////////////////////////
class _FlutterLayoutArticleState extends State<FlutterLayoutArticle> {
late int count;
late widget example;
late string code;
late string explanation;
@override
void initState() {
count = 1;
code = const example1().code;
explanation = const example1().explanation;
super.initState();
}
@override
void didUpdateWidget(FlutterLayoutArticle oldWidget) {
super.didUpdateWidget(oldWidget);
var example = widget.examples[count - 1];
code = example.code;
explanation = example.explanation;
}
@override
widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,