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@override
final code = 'Center(\n'
' child: Container(width: 100, height: 100, color: red))';
@override
final String explanation =
'The screen forces the Center to be exactly the same size as the screen, '
'so the Center fills the screen.'
'\n\n'
'The Center tells the Container that it can be any size it wants, but not bigger than the screen.'
'Now the Container can indeed be 100x100.';
@override
Widget build(BuildContext context) {
return Center(
child: Container(width: 100, height: 100, color: red),
);
}
}
//////////////////////////////////////////////////
class Example4 extends Example {
const Example4({super.key});
@override
final code = 'Align(\n'
' alignment: Alignment.bottomRight,\n'
' child: Container(width: 100, height: 100, color: red))';
@override
final String explanation =
'This is different from the previous example in that it uses Align instead of Center.'
'\n\n'
'Align also tells the Container that it can be any size it wants, but if there is empty space it won\'t center the Container. '
'Instead, it aligns the Container to the bottom-right of the available space.';
@override
Widget build(BuildContext context) {
return Align(
alignment: Alignment.bottomRight,
child: Container(width: 100, height: 100, color: red),
);
}
}
//////////////////////////////////////////////////
class Example5 extends Example {
const Example5({super.key});
@override
final code = 'Center(\n'
' child: Container(\n'
' color: red,\n'
' width: double.infinity,\n'
' height: double.infinity))';
@override
final String explanation =
'The screen forces the Center to be exactly the same size as the screen, '
'so the Center fills the screen.'
'\n\n'
'The Center tells the Container that it can be any size it wants, but not bigger than the screen.'
'The Container wants to be of infinite size, but since it can\'t be bigger than the screen, it just fills the screen.';
@override
Widget build(BuildContext context) {
return Center(
child: Container(
width: double.infinity, height: double.infinity, color: red),
);
}
}
//////////////////////////////////////////////////
class Example6 extends Example {
const Example6({super.key});
@override
final code = 'Center(child: Container(color: red))';
@override
final String explanation =
'The screen forces the Center to be exactly the same size as the screen, '
'so the Center fills the screen.'
'\n\n'
'The Center tells the Container that it can be any size it wants, but not bigger than the screen.'
'\n\n'
'Since the Container has no child and no fixed size, it decides it wants to be as big as possible, so it fills the whole screen.'
'\n\n'
'But why does the Container decide that? '
'Simply because that\'s a design decision by those who created the Container widget. '
'It could have been created differently, and you have to read the Container documentation to understand how it behaves, depending on the circumstances. ';
@override
Widget build(BuildContext context) {
return Center(
child: Container(color: red),
);
}
}
//////////////////////////////////////////////////
class Example7 extends Example {
const Example7({super.key});
@override
final code = 'Center(\n'
' child: Container(color: red\n'
' child: Container(color: green, width: 30, height: 30)))';
@override
final String explanation =
'The screen forces the Center to be exactly the same size as the screen, '
'so the Center fills the screen.'
'\n\n'
'The Center tells the red Container that it can be any size it wants, but not bigger than the screen.'
'Since the red Container has no size but has a child, it decides it wants to be the same size as its child.'