85 lines
2.3 KiB
TypeScript
85 lines
2.3 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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/**
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* The strategy that the default change detector uses to detect changes.
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* When set, takes effect the next time change detection is triggered.
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*
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* @publicApi
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*/
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export enum ChangeDetectionStrategy {
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/**
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* Use the `CheckOnce` strategy, meaning that automatic change detection is deactivated
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* until reactivated by setting the strategy to `Default` (`CheckAlways`).
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* Change detection can still be explicitly invoked.
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*/
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OnPush = 0,
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/**
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* Use the default `CheckAlways` strategy, in which change detection is automatic until
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* explicitly deactivated.
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*/
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Default = 1,
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}
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/**
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* Defines the possible states of the default change detector.
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* @see `ChangeDetectorRef`
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*/
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export enum ChangeDetectorStatus {
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/**
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* A state in which, after calling `detectChanges()`, the change detector
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* state becomes `Checked`, and must be explicitly invoked or reactivated.
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*/
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CheckOnce,
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/**
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* A state in which change detection is skipped until the change detector mode
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* becomes `CheckOnce`.
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*/
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Checked,
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/**
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* A state in which change detection continues automatically until explicitly
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* deactivated.
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*/
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CheckAlways,
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/**
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* A state in which a change detector sub tree is not a part of the main tree and
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* should be skipped.
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*/
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Detached,
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/**
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* Indicates that the change detector encountered an error checking a binding
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* or calling a directive lifecycle method and is now in an inconsistent state. Change
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* detectors in this state do not detect changes.
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*/
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Errored,
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/**
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* Indicates that the change detector has been destroyed.
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*/
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Destroyed,
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}
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/**
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* Reports whether a given strategy is currently the default for change detection.
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* @param changeDetectionStrategy The strategy to check.
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* @returns True if the given strategy is the current default, false otherwise.
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* @see `ChangeDetectorStatus`
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* @see `ChangeDetectorRef`
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*/
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export function isDefaultChangeDetectionStrategy(changeDetectionStrategy: ChangeDetectionStrategy):
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boolean {
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return changeDetectionStrategy == null ||
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changeDetectionStrategy === ChangeDetectionStrategy.Default;
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}
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