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});
@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});
@override
final code = 'center(\n'
' child: container(width: 100, height: 100, color: red))';
@override
final string explanation =
'the screen forces the center to be exactly the same size as the screen, '
'so the center fills the screen.'
'\n\n'
'the center tells the container that it can be any size it wants, but not bigger than the screen.'
'now the container can indeed be 100x100.';
@override
widget build(BuildContext context) {
return center(
child: container(width: 100, height: 100, color: red),
);
}
}
//////////////////////////////////////////////////
class example4 extends example {
const example4({super.key});
@override
final code = 'align(\n'
' alignment: Alignment.bottomRight,\n'
' child: container(width: 100, height: 100, color: red))';
@override
final string explanation =
'this is different from the previous example in that it uses align instead of center.'
'\n\n'
'align also tells the container that it can be any size it wants, but if there is empty space it won\'t center the container. '
'instead, it aligns the container to the bottom-right of the available space.';
@override
widget build(BuildContext context) {
return align(
alignment: Alignment.bottomRight,
child: container(width: 100, height: 100, color: red),
);
}
}
//////////////////////////////////////////////////
class example5 extends example {
const example5({super.key});
@override
final code = 'center(\n'
' child: container(\n'
' color: red,\n'