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flutter_docs

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'flutter can\'t render infinite sizes, so it throws an error with the following message: '
'"boxconstraints forces an infinite width."';
@override
widget build(BuildContext context) {
return UnconstrainedBox(
child: container(color: colors.red, width: double.infinity, height: 100),
);
}
}
//////////////////////////////////////////////////
class example17 extends example {
const example17({super.key});
@override
final code = 'unconstrainedbox(\n'
' child: LimitedBox(maxWidth: 100,\n'
' child: container(color: colors.red,\n'
' width: double.infinity, height: 100));';
@override
final string explanation = 'here you won\'t get an error anymore, '
'because when the LimitedBox is given an infinite size by the UnconstrainedBox, '
'it passes a maximum width of 100 down to its child.'
'\n\n'
'if you swap the UnconstrainedBox for a center widget, '
'the LimitedBox won\'t apply its limit anymore (since its limit is only applied when it gets infinite constraints), '
'and the width of the container is allowed to grow past 100.'
'\n\n'
'this explains the difference between a LimitedBox and a ConstrainedBox.';
@override
widget build(BuildContext context) {
return UnconstrainedBox(
child: LimitedBox(
maxWidth: 100,
child: container(
color: colors.red,
width: double.infinity,
height: 100,
),
),
);
}
}
//////////////////////////////////////////////////
class example18 extends example {
const example18({super.key});
@override
final code = 'fittedbox(\n'
' child: Text(\'Some example text.\'));';
@override
final string explanation =
'the screen forces the FittedBox to be exactly the same size as the screen.'
'the text has some natural width (also called its intrinsic width) that depends on the amount of text, its font size, and so on.'
'\n\n'
'the FittedBox lets the text be any size it wants, '
'but after the text tells its size to the FittedBox, '
'the FittedBox scales the text until it fills all of the available width.';
@override
widget build(BuildContext context) {
return const FittedBox(
child: Text('Some example text.'),
);
}
}
//////////////////////////////////////////////////
class example19 extends example {
const example19({super.key});
@override
final code = 'center(\n'
' child: FittedBox(\n'
' child: Text(\'Some example text.\')));';
@override
final string explanation =
'but what happens if you put the FittedBox inside of a center widget? '
'the center lets the FittedBox be any size it wants, up to the screen size.'
'\n\n'
'the FittedBox then sizes itself to the text, and lets the text be any size it wants.'
'\n\n'
'since both FittedBox and the text have the same size, no scaling happens.';
@override
widget build(BuildContext context) {
return const center(
child: FittedBox(
child: Text('Some example text.'),
),
);
}
}
////////////////////////////////////////////////////
class example20 extends example {
const example20({super.key});
@override
final code = 'center(\n'
' child: FittedBox(\n'
' child: text(\'…\')));';
@override
final string explanation =
'however, what happens if FittedBox is inside of a center widget, but the text is too large to fit the screen?'
'\n\n'
'fittedbox tries to size itself to the text, but it can\'t be bigger than the screen. '
'it then assumes the screen size, and resizes text so that it fits the screen, too.';
@override