TrackerState class

@author jd

Inheritance

Constructors

TrackerState({required List<String> initHitIds, HitViewPortCondition? hitViewPortCondition})

Properties

hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
inViewWidgetIdsLength → int
in-view 数量
no setter
numberOfContext → int
element tree上context的数据
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scrollDirection ↔ Axis
getter/setter pair
visibleContexts → List<BuildContext?>
可见的组件
no setter
visibleIndexs → List<String?>
no setter
vpHeight ↔ double
viewport height
getter/setter pair
vpWidth ↔ double
viewport width
getter/setter pair

Methods

addContext(WidgetContextData item) → void
Add the widget's context and an unique string id that needs to be notified.
addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
clearDisplay() → void
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed).
inherited
inView(String id) → bool
Checks if the widget with the id is currently in-view or not.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
onScroll(ScrollNotification notification) → void
The listener that is called when the list view is scrolled.
removeContext(String id) → void
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited