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example 18
<code_start>
const FittedBox(
child: Text('Some example text.'),
)
<code_end>
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.
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.
<topic_end>
<topic_start>
example 19
<code_start>
const center(
child: FittedBox(
child: Text('Some example text.'),
),
)
<code_end>
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.
the FittedBox then sizes itself to the text,
and lets the text be any size it wants.
since both FittedBox and the text have the same size,
no scaling happens.
<topic_end>
<topic_start>
example 20
<code_start>
const center(
child: FittedBox(
child: text(
'this is some very very very large text that is too big to fit a regular screen in a single line.'),
),
)
<code_end>
however, what happens if FittedBox is inside of a center
widget, but the text is too large to fit the screen?
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.
<topic_end>
<topic_start>
example 21
<code_start>
const center(
child: text(
'this is some very very very large text that is too big to fit a regular screen in a single line.'),
)
<code_end>
if, however, you remove the FittedBox, the text
gets its maximum width from the screen,
and breaks the line so that it fits the screen.
<topic_end>
<topic_start>
example 22
<code_start>
FittedBox(
child: container(
height: 20,
width: double.infinity,
color: colors.red,
),
)
<code_end>
FittedBox can only scale a widget that is bounded
(has non-infinite width and height). otherwise,
it won’t render anything,
and you’ll see an error in the console.
<topic_end>
<topic_start>
example 23
<code_start>
row(
children: [
container(color: red, child: const Text('Hello!', style: big)),
container(color: green, child: const Text('Goodbye!', style: big)),
],
)
<code_end>
the screen forces the row to be exactly the same size
as the screen.
just like an UnconstrainedBox, the row won’t
impose any constraints onto its children,
and instead lets them be any size they want.
the row then puts them side-by-side,
and any extra space remains empty.
<topic_end>
<topic_start>
example 24
<code_start>
row(
children: [