SchedulerPhase enum Null safety

The various phases that a SchedulerBinding goes through during SchedulerBinding.handleBeginFrame.

This is exposed by SchedulerBinding.schedulerPhase.

The values of this enum are ordered in the same order as the phases occur, so their relative index values can be compared to each other.

See also:


idle → const SchedulerPhase

No frame is being processed. Tasks (scheduled by SchedulerBinding.scheduleTask), microtasks (scheduled by scheduleMicrotask), Timer callbacks, event handlers (e.g. from user input), and other callbacks (e.g. from Futures, Streams, and the like) may be executing.

const SchedulerPhase(0)
midFrameMicrotasks → const SchedulerPhase

Microtasks scheduled during the processing of transient callbacks are current executing.

This may include, for instance, callbacks from futures resolved during the transientCallbacks phase.

const SchedulerPhase(2)
persistentCallbacks → const SchedulerPhase

The persistent callbacks (scheduled by SchedulerBinding.addPersistentFrameCallback) are currently executing.

Typically, this is the build/layout/paint pipeline. See WidgetsBinding.drawFrame and SchedulerBinding.handleDrawFrame.

const SchedulerPhase(3)
postFrameCallbacks → const SchedulerPhase

The post-frame callbacks (scheduled by SchedulerBinding.addPostFrameCallback) are currently executing.

Typically, these callbacks handle cleanup and scheduling of work for the next frame.

See SchedulerBinding.handleDrawFrame.

const SchedulerPhase(4)
transientCallbacks → const SchedulerPhase

The transient callbacks (scheduled by SchedulerBinding.scheduleFrameCallback) are currently executing.

Typically, these callbacks handle updating objects to new animation states.

See SchedulerBinding.handleBeginFrame.

const SchedulerPhase(1)
values → const List<SchedulerPhase>

A constant List of the values in this enum, in order of their declaration.

const List<SchedulerPhase>


hashCode int
The hash code for this object. [...]
read-only, inherited
index int

The integer index of this enum.

runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toString() String
A string representation of this object. [...]


operator ==(Object other) bool
The equality operator. [...]