SchedulerBinding vs WidgetsBinding

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2 Answers

There are three callbacks available in flutter which rendering flutter widgets.

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Transient callbacks: triggered by the system’s [Window.onBeginFrame] callback, for synchronizing the application’s behavior to the system’s display. For example, [Ticker]s and [AnimationController]s trigger from these.

Persistent callbacks: triggered by the system’s [Window.onDrawFrame] callback, for updating the system’s display after transient callbacks have executed. For example, the rendering layer uses this to drive its rendering pipeline.

Post-frame callbacks: which are run after persistent callbacks, just before returning from the [Window.onDrawFrame] callback. * Non-rendering tasks, to be run between frames. These are given a priority and are executed in priority order according to a schedulingStrategy. All above callbacks run sequentially, but for us, the last callback would work i.e Post-frame callbacks

Widgets Binding: The glue between the widgets layer and the Flutter engine. which comes with WidgetsBindingObserver mixin which has many callbacks but one which required to use is didChangeAppLifecycleState that returns AppLifecycleState.

Scheduler Binding: This is also similar to WidgetBinding but it does not provide any life cycle callbacks.

The below binding example would be called exactly the ones, means print statement like WidgetsBinding & SchedulerBinding will be printed only once as we called it initState(), but it will be called when build method finished it’s rendering.

void initState() {
  super.initState();
  print("initState");
  WidgetsBinding.instance.addPostFrameCallback((_) {
    print("WidgetsBinding");
  });
  SchedulerBinding.instance.addPostFrameCallback((_) {
    print("SchedulerBinding");
  });
}

200

answered Sep 24 '22 01:09

Jitesh Mohite

Both solutions do the same.

WidgetsBinding inherits this Method from SchedulerBinding https://api.flutter.dev/flutter/widgets/WidgetsBinding-mixin.html

It registers a callback that will be called after the frame is build. See in the docs: https://api.flutter.dev/flutter/scheduler/SchedulerBinding/addPostFrameCallback.html

answered Sep 24 '22 01:09

ZeRj

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SchedulerBinding vs WidgetsBinding

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Jitesh Mohite

ZeRj

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