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'\n\n'
'The red Container tells its child that it can be any size it wants, but not bigger than the screen.'
'\n\n'
'The child is a green Container that wants to be 30x30.'
'\n\n'
'Since the red `Container` has no size but has a child, it decides it wants to be the same size as its child. '
'The red color isn\'t visible, since the green Container entirely covers all of the red Container.';
@override
Widget build(BuildContext context) {
return Center(
child: Container(
color: red,
child: Container(color: green, width: 30, height: 30),
),
);
}
}
//////////////////////////////////////////////////
class Example8 extends Example {
const Example8({super.key});
@override
final code = 'Center(\n'
' child: Container(color: red\n'
' padding: const EdgeInsets.all(20),\n'
' child: Container(color: green, width: 30, height: 30)))';
@override
final String explanation =
'The red Container sizes itself to its children size, but it takes its own padding into consideration. '
'So it is also 30x30 plus padding. '
'The red color is visible because of the padding, and the green Container has the same size as in the previous example.';
@override
Widget build(BuildContext context) {
return Center(
child: Container(
padding: const EdgeInsets.all(20),
color: red,
child: Container(color: green, width: 30, height: 30),
),
);
}
}
//////////////////////////////////////////////////
class Example9 extends Example {
const Example9({super.key});
@override
final code = 'ConstrainedBox(\n'
' constraints: BoxConstraints(\n'
' minWidth: 70, minHeight: 70,\n'
' maxWidth: 150, maxHeight: 150),\n'
' child: Container(color: red, width: 10, height: 10)))';
@override
final String explanation =
'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.'
'\n\n'
'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.';
@override
Widget build(BuildContext context) {
return ConstrainedBox(
constraints: const BoxConstraints(
minWidth: 70,
minHeight: 70,
maxWidth: 150,
maxHeight: 150,
),
child: Container(color: red, width: 10, height: 10),
);
}
}
//////////////////////////////////////////////////
class Example10 extends Example {
const Example10({super.key});
@override
final code = 'Center(\n'
' child: ConstrainedBox(\n'
' constraints: BoxConstraints(\n'
' minWidth: 70, minHeight: 70,\n'
' maxWidth: 150, maxHeight: 150),\n'
' child: Container(color: red, width: 10, height: 10))))';
@override
final String explanation =
'Now, Center allows ConstrainedBox to be any size up to the screen size.'
'\n\n'
'The ConstrainedBox imposes ADDITIONAL constraints from its \'constraints\' parameter onto its child.'
'\n\n'
'The Container must be between 70 and 150 pixels. It wants to have 10 pixels, so it will end up having 70 (the MINIMUM).';
@override
Widget build(BuildContext context) {
return Center(
child: ConstrainedBox(
constraints: const BoxConstraints(
minWidth: 70,
minHeight: 70,
maxWidth: 150,
maxHeight: 150,
),
child: Container(color: red, width: 10, height: 10),
),