@angular/core
Version:
Angular - the core framework
83 lines • 10.9 kB
JavaScript
/**
* @license
* Copyright Google Inc. 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';
var 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 ngComponentDef = defineComponent({
* ...
* inputs: {name: 'publicName'},
* features: [NgOnChangesFeature()]
* });
* ```
*
* @codeGenApi
*/
export function ɵɵNgOnChangesFeature() {
// This option ensures that the ngOnChanges lifecycle hook will be inherited
// from superclasses (in InheritDefinitionFeature).
NgOnChangesFeatureImpl.ngInherit = true;
return NgOnChangesFeatureImpl;
}
function NgOnChangesFeatureImpl(definition) {
if (definition.type.prototype.ngOnChanges) {
definition.setInput = ngOnChangesSetInput;
definition.onChanges = wrapOnChanges();
}
}
function wrapOnChanges() {
return function wrapOnChangesHook_inPreviousChangesStorage() {
var simpleChangesStore = getSimpleChangesStore(this);
var current = simpleChangesStore && simpleChangesStore.current;
if (current) {
var 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 (var key in current) {
previous[key] = current[key];
}
}
simpleChangesStore.current = null;
this.ngOnChanges(current);
}
};
}
function ngOnChangesSetInput(instance, value, publicName, privateName) {
var simpleChangesStore = getSimpleChangesStore(instance) ||
setSimpleChangesStore(instance, { previous: EMPTY_OBJ, current: null });
var current = simpleChangesStore.current || (simpleChangesStore.current = {});
var previous = simpleChangesStore.previous;
var declaredName = this.declaredInputs[publicName];
var previousChange = previous[declaredName];
current[declaredName] = new SimpleChange(previousChange && previousChange.currentValue, value, previous === EMPTY_OBJ);
instance[privateName] = value;
}
var 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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