Documentation Index
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The Stac BoxConstraints class specifies minimum and maximum dimensions for a widget. It’s commonly used with ConstrainedBox or as part of button styles.
Properties
| Property | Type | Description |
|---|
| minWidth | double? | Minimum width constraint in logical pixels. |
| maxWidth | double? | Maximum width constraint in logical pixels. |
| minHeight | double? | Minimum height constraint in logical pixels. |
| maxHeight | double? | Maximum height constraint in logical pixels. |
Example
StacConstrainedBox(
constraints: StacBoxConstraints(
minWidth: 100.0,
maxWidth: 300.0,
minHeight: 50.0,
maxHeight: 200.0,
),
child: StacContainer(
color: StacColors.blue,
child: StacText(data: 'Constrained'),
),
)
Common Constraint Patterns
Fixed Width
StacConstrainedBox(
constraints: StacBoxConstraints(
minWidth: 200.0,
maxWidth: 200.0,
),
child: StacElevatedButton(
child: StacText(data: 'Fixed Width Button'),
),
)
Minimum Size
StacConstrainedBox(
constraints: StacBoxConstraints(
minWidth: 150.0,
minHeight: 100.0,
),
child: StacCard(
child: StacCenter(
child: StacText(data: 'At least 150x100'),
),
),
)
Maximum Size
StacConstrainedBox(
constraints: StacBoxConstraints(
maxWidth: 400.0,
maxHeight: 300.0,
),
child: StacImage(
network: 'https://example.com/large-image.jpg',
fit: StacBoxFit.contain,
),
)
StacElevatedButton(
style: StacButtonStyle(
minimumSize: StacSize(width: 200.0, height: 48.0),
maximumSize: StacSize(width: 300.0, height: 56.0),
),
child: StacText(data: 'Styled Button'),
)
Infinite Constraints
Use double.infinity for unbounded constraints:
StacConstrainedBox(
constraints: StacBoxConstraints(
minWidth: double.infinity, // Full width
minHeight: 100.0,
),
child: StacContainer(
color: StacColors.blue,
child: StacCenter(
child: StacText(
data: 'Full Width',
style: StacTextStyle(color: StacColors.white),
),
),
),
)
