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:
- WidgetsBinding.drawFrame, which pumps the build and rendering pipeline to generate a frame.
Constants
- 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>
Properties
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
-
toString(
) → String -
A string representation of this object. [...]
override
Operators
-
operator ==(
Object other) → bool -
The equality operator. [...]
inherited