WidgetPlaceholder class
A widget builder that can be extended with callbacks.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- WidgetPlaceholder
Constructors
- WidgetPlaceholder({WidgetPlaceholderBuilder? builder, Widget? child, String? debugLabel, Key? key})
- Creates a placeholder.
Properties
- debugLabel → String?
-
A human-readable description of this placeholder.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- isEmpty → bool
-
Whether this placeholder renders anything.
no setter
- 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
-
callBuilders(
BuildContext context, Widget? child) → Widget -
Calls builder callbacks on the specified
child
widget. -
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.
override
-
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
-
wrapWith(
WidgetPlaceholderBuilder builder) → WidgetPlaceholder -
Enqueues
builder
to be built later.
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Static Methods
-
lazy(
Widget child, {String? debugLabel}) → WidgetPlaceholder - Creates a placeholder lazily.
-
unwrap(
BuildContext context, Widget widget) → Widget - Builds widget if it is a placeholder.