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}
Widget button(int exampleNumber) {
return Button(
key: ValueKey('button$exampleNumber'),
isSelected: count == exampleNumber,
exampleNumber: exampleNumber,
onPressed: () {
showExample(
exampleNumber,
widget.examples[exampleNumber - 1].code,
widget.examples[exampleNumber - 1].explanation,
);
},
);
}
void showExample(int exampleNumber, String code, String explanation) {
setState(() {
count = exampleNumber;
this.code = code;
this.explanation = explanation;
});
}
}
//////////////////////////////////////////////////
class Button extends StatelessWidget {
final bool isSelected;
final int exampleNumber;
final VoidCallback onPressed;
const Button({
super.key,
required this.isSelected,
required this.exampleNumber,
required this.onPressed,
});
@override
Widget build(BuildContext context) {
return TextButton(
style: TextButton.styleFrom(
foregroundColor: Colors.white,
backgroundColor: isSelected ? Colors.grey : Colors.grey[800],
),
child: Text(exampleNumber.toString()),
onPressed: () {
Scrollable.ensureVisible(
context,
duration: const Duration(milliseconds: 350),
curve: Curves.easeOut,
alignment: 0.5,
);
onPressed();
},
);
}
}
//////////////////////////////////////////////////
class Example1 extends Example {
const Example1({super.key});
@override
final code = 'Container(color: red)';
@override
final explanation = 'The screen is the parent of the Container, '
'and it forces the Container to be exactly the same size as the screen.'
'\n\n'
'So the Container fills the screen and paints it red.';
@override
Widget build(BuildContext context) {
return Container(color: red);
}
}
//////////////////////////////////////////////////
class Example2 extends Example {
const Example2({super.key});
@override
final code = 'Container(width: 100, height: 100, color: red)';
@override
final String explanation =
'The red Container wants to be 100x100, but it can\'t, '
'because the screen forces it to be exactly the same size as the screen.'
'\n\n'
'So the Container fills the screen.';
@override
Widget build(BuildContext context) {
return Container(width: 100, height: 100, color: red);
}
}
//////////////////////////////////////////////////
class Example3 extends Example {
const Example3({super.key});