ValueListenableBuilder<T> class
A widget whose content stays synced with a ValueListenable.
Given a ValueListenable<T> and a builder which builds widgets from
concrete values of T, this class will automatically register itself as a
listener of the ValueListenable and call the builder with updated values
when the value changes.
See also:
- StreamBuilder, where a builder can depend on a Stream rather than a ValueListenable for more advanced use cases.
- Inheritance
-
- Object
- Widget
- StatefulWidget
- ValueListenableBuilder
Constructors
-
ValueListenableBuilder({Key? key, required ValueListenable<
T> valueListenable, required ValueWidgetBuilder<T> builder, Widget? child}) -
Creates a ValueListenableBuilder.
const
Properties
-
builder
→ ValueWidgetBuilder<
T> -
A ValueWidgetBuilder which builds a widget depending on the
valueListenable's value.
final
- child → Widget?
-
A valueListenable-independent widget which is passed back to the
builder.
final
- correspondingTag → DomTagType?
-
Corresponding HTML tag to use to render this widget
no setterinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Keys help Rad identify which widgets have changed, are added, or are
removed when a widget has multiple sibling widgets.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
valueListenable
→ ValueListenable<
T> -
The ValueListenable whose value you depend on in order to build.
final
-
widgetCaptureEventListeners
→ Map<
DomEventType, EventCallback?> -
Events that this widget is listening to in capturing phase.
no setterinherited
-
widgetEventListeners
→ Map<
DomEventType, EventCallback?> -
Events that this widget is listening to in bubbling phase.
no setterinherited
Methods
-
createRenderElement(
RenderElement parent) → RenderElement -
Create element for current widget.
inherited
-
createState(
) → State< StatefulWidget> -
Creates the mutable state for this widget at a given location in the tree.
override
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
shouldUpdateWidget(
Widget oldWidget) → bool -
Whether to update current widget.
inherited
-
shouldUpdateWidgetChildren(
Widget oldWidget, bool shouldUpdateWidget) → bool -
Whether to update current widget's children.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited