Value<T> class

Value

Rebuild the widget when the node is changed.

path is the path of the node. If the node does not exist, pass null to builder(). path 는 노드의 경로이다. 만약 해당 노드가 존재하지 않으면 null 을 builder() 로 전달한다.

ref is the reference of the node. If the node does not exist, pass null to builder().

builder is the widget builder.

initialData is the initial data to show when waiting for the data. This is useful to prevent the screen flickering.

onLoading is the widget to show when waiting for the data.

Example: below will get the snapshot of /path/to/node

Value(path: 'path/to/node', builder: (value) {
 return Text(value);
});

Inheritance

Constructors

Value({Key? key, required DatabaseReference ref, required Widget builder(dynamic value, DatabaseReference ref), dynamic initialData, Widget? onLoading, bool sync = true}): const

builder → Widget Function(dynamic value, DatabaseReference ref): dynamic is the value of the node. String is the path of the node.
final
hashCode → int: The hash code for this object.
no setterinherited
initialData → dynamic: final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
onLoading → Widget?: final
ref → DatabaseReference: final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
sync → bool: final

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, int wrapWidth = 65}) → 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