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child: Container(color: red, width: 10, height: 10),
|
)
|
<code_end>
|
You might guess that the Container has to be
|
between 70 and 150 pixels, but you would be wrong.
|
The ConstrainedBox only imposes additional constraints
|
from those it receives from its parent.
|
Here, the screen forces the ConstrainedBox to be exactly
|
the same size as the screen, so it tells its child Container
|
to also assume the size of the screen, thus ignoring its
|
constraints parameter.
|
<topic_end>
|
<topic_start>
|
Example 10
|
<code_start>
|
Center(
|
child: ConstrainedBox(
|
constraints: const BoxConstraints(
|
minWidth: 70,
|
minHeight: 70,
|
maxWidth: 150,
|
maxHeight: 150,
|
),
|
child: Container(color: red, width: 10, height: 10),
|
),
|
)
|
<code_end>
|
Now, 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 10 pixels,
|
so it ends up having 70 (the minimum).
|
<topic_end>
|
<topic_start>
|
Example 11
|
<code_start>
|
Center(
|
child: ConstrainedBox(
|
constraints: const BoxConstraints(
|
minWidth: 70,
|
minHeight: 70,
|
maxWidth: 150,
|
maxHeight: 150,
|
),
|
child: Container(color: red, width: 1000, height: 1000),
|
),
|
)
|
<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 1000 pixels,
|
so it ends up having 150 (the maximum).
|
<topic_end>
|
<topic_start>
|
Example 12
|
<code_start>
|
Center(
|
child: ConstrainedBox(
|
constraints: const BoxConstraints(
|
minWidth: 70,
|
minHeight: 70,
|
maxWidth: 150,
|
maxHeight: 150,
|
),
|
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
|
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