BuildCondition class
Runs a WidgetBuilder's result if the condition is true.
When condition is true the builder is run. If false and fallback is not null, fallback is run. If fallback is null and condition is false, an empty Container is rendered.
Example:
BuildCondition(
condition: true,
builder: (context) {
return Text('This gets rendered');
},
)
BuildCondition(
condition: false,
builder: (context) {
return Text('This does not get rendered, an empty Container will be rendered');
},
)
BuildCondition(
condition: false,
builder: (context) {
return Text('This does not get rendered, as fallback is not null, it is used to render the fallback widget.');
},
fallback: (context) {
return Text('This gets rendered');
}
)
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- BuildCondition
Constructors
- BuildCondition({Key? key, bool? condition, WidgetBuilder? builder, WidgetBuilder? fallback})
-
const
Properties
- builder → WidgetBuilder?
-
Run if condition is true.
final
- condition → bool?
-
Condition to control what gets rendered.
final
- fallback → WidgetBuilder?
-
Run if condition is false and it is not null.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
build(
BuildContext context) → Widget -
Describes the part of the user interface represented by this widget.
override
-
createElement(
) → StatelessElement -
Creates a StatelessElement to manage this widget's location in the tree.
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNode
objects describing this node's children.inherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited