@angular/core
Version:
Angular - the core framework
82 lines • 10.8 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { SimpleChange } from '../../interface/simple_change';
import { EMPTY_OBJ } from '../empty';
const PRIVATE_PREFIX = '__ngOnChanges_';
/**
* The NgOnChangesFeature decorates a component with support for the ngOnChanges
* lifecycle hook, so it should be included in any component that implements
* that hook.
*
* If the component or directive uses inheritance, the NgOnChangesFeature MUST
* be included as a feature AFTER {@link InheritDefinitionFeature}, otherwise
* inherited properties will not be propagated to the ngOnChanges lifecycle
* hook.
*
* Example usage:
*
* ```
* static ɵcmp = defineComponent({
* ...
* inputs: {name: 'publicName'},
* features: [NgOnChangesFeature]
* });
* ```
*
* @codeGenApi
*/
export function ɵɵNgOnChangesFeature(definition) {
if (definition.type.prototype.ngOnChanges) {
definition.setInput = ngOnChangesSetInput;
definition.onChanges = wrapOnChanges();
}
}
// This option ensures that the ngOnChanges lifecycle hook will be inherited
// from superclasses (in InheritDefinitionFeature).
/** @nocollapse */
// tslint:disable-next-line:no-toplevel-property-access
ɵɵNgOnChangesFeature.ngInherit = true;
function wrapOnChanges() {
return function wrapOnChangesHook_inPreviousChangesStorage() {
const simpleChangesStore = getSimpleChangesStore(this);
const current = simpleChangesStore && simpleChangesStore.current;
if (current) {
const previous = simpleChangesStore.previous;
if (previous === EMPTY_OBJ) {
simpleChangesStore.previous = current;
}
else {
// New changes are copied to the previous store, so that we don't lose history for inputs
// which were not changed this time
for (let key in current) {
previous[key] = current[key];
}
}
simpleChangesStore.current = null;
this.ngOnChanges(current);
}
};
}
function ngOnChangesSetInput(instance, value, publicName, privateName) {
const simpleChangesStore = getSimpleChangesStore(instance) ||
setSimpleChangesStore(instance, { previous: EMPTY_OBJ, current: null });
const current = simpleChangesStore.current || (simpleChangesStore.current = {});
const previous = simpleChangesStore.previous;
const declaredName = this.declaredInputs[publicName];
const previousChange = previous[declaredName];
current[declaredName] = new SimpleChange(previousChange && previousChange.currentValue, value, previous === EMPTY_OBJ);
instance[privateName] = value;
}
const SIMPLE_CHANGES_STORE = '__ngSimpleChanges__';
function getSimpleChangesStore(instance) {
return instance[SIMPLE_CHANGES_STORE] || null;
}
function setSimpleChangesStore(instance, store) {
return instance[SIMPLE_CHANGES_STORE] = store;
}
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