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),
child: container(color: red, width: 100, height: 100),
),
)
<code_end>
center allows ConstrainedBox to be any size up to the
screen size. the ConstrainedBox imposes additional
constraints from its constraints parameter onto its child.
the container must be between 70 and 150 pixels.
it wants to have 100 pixels, and that’s the size it has,
since that’s between 70 and 150.
<topic_end>
<topic_start>
example 13
<code_start>
UnconstrainedBox(
child: container(color: red, width: 20, height: 50),
)
<code_end>
the screen forces the UnconstrainedBox to be exactly
the same size as the screen. however, the UnconstrainedBox
lets its child container be any size it wants.
<topic_end>
<topic_start>
example 14
<code_start>
UnconstrainedBox(
child: container(color: red, width: 4000, height: 50),
)
<code_end>
the screen forces the UnconstrainedBox to be exactly
the same size as the screen, and UnconstrainedBox
lets its child container be any size it wants.
unfortunately, in this case the container is
4000 pixels wide and is too big to fit in
the UnconstrainedBox, so the UnconstrainedBox displays
the much dreaded “overflow warning”.
<topic_end>
<topic_start>
example 15
<code_start>
OverflowBox(
minWidth: 0,
minHeight: 0,
maxWidth: double.infinity,
maxHeight: double.infinity,
child: container(color: red, width: 4000, height: 50),
)
<code_end>
the screen forces the OverflowBox to be exactly the same
size as the screen, and OverflowBox lets its child container
be any size it wants.
OverflowBox is similar to UnconstrainedBox;
the difference is that it won’t display any warnings
if the child doesn’t fit the space.
in this case, the container has 4000 pixels of width,
and is too big to fit in the OverflowBox,
but the OverflowBox simply shows as much as it can,
with no warnings given.
<topic_end>
<topic_start>
example 16
<code_start>
UnconstrainedBox(
child: container(color: colors.red, width: double.infinity, height: 100),
)
<code_end>
this won’t render anything, and you’ll see an error in the console.
the UnconstrainedBox lets its child be any size it wants,
however its child is a container with infinite size.
flutter can’t render infinite sizes, so it throws an error with
the following message: BoxConstraints forces an infinite width.
<topic_end>
<topic_start>
example 17
<code_start>
UnconstrainedBox(
child: LimitedBox(
maxWidth: 100,
child: container(
color: colors.red,
width: double.infinity,
height: 100,
),
),
)
<code_end>
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.
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.
this explains the difference between a LimitedBox
and a ConstrainedBox.
<topic_end>
<topic_start>