@angular/core
Version:
Angular - the core framework
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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 { assertString } from '../../util/assert';
import { EMPTY_OBJ } from '../../util/empty';
import { applyValueToInputField } from '../apply_value_input_field';
/**
* 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() {
return NgOnChangesFeatureImpl;
}
export function NgOnChangesFeatureImpl(definition) {
if (definition.type.prototype.ngOnChanges) {
definition.setInput = ngOnChangesSetInput;
}
return rememberChangeHistoryAndInvokeOnChangesHook;
}
// 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;
/**
* This is a synthetic lifecycle hook which gets inserted into `TView.preOrderHooks` to simulate
* `ngOnChanges`.
*
* The hook reads the `NgSimpleChangesStore` data from the component instance and if changes are
* found it invokes `ngOnChanges` on the component instance.
*
* @param this Component instance. Because this function gets inserted into `TView.preOrderHooks`,
* it is guaranteed to be called with component instance.
*/
function rememberChangeHistoryAndInvokeOnChangesHook() {
const simpleChangesStore = getSimpleChangesStore(this);
const current = 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, inputSignalNode, value, publicName, privateName) {
const declaredName = this.declaredInputs[publicName];
ngDevMode && assertString(declaredName, 'Name of input in ngOnChanges has to be a string');
const simpleChangesStore = getSimpleChangesStore(instance) ||
setSimpleChangesStore(instance, { previous: EMPTY_OBJ, current: null });
const current = simpleChangesStore.current || (simpleChangesStore.current = {});
const previous = simpleChangesStore.previous;
const previousChange = previous[declaredName];
current[declaredName] = new SimpleChange(previousChange && previousChange.currentValue, value, previous === EMPTY_OBJ);
applyValueToInputField(instance, inputSignalNode, 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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Because this function gets inserted into `TView.preOrderHooks`,\n *     it is guaranteed to be called with component instance.\n */\nfunction rememberChangeHistoryAndInvokeOnChangesHook(this: OnChanges) {\n  const simpleChangesStore = getSimpleChangesStore(this);\n  const current = simpleChangesStore?.current;\n\n  if (current) {\n    const previous = simpleChangesStore!.previous;\n    if (previous === EMPTY_OBJ) {\n      simpleChangesStore!.previous = current;\n    } else {\n      // New changes are copied to the previous store, so that we don't lose history for inputs\n      // which were not changed this time\n      for (let key in current) {\n        previous[key] = current[key];\n      }\n    }\n    simpleChangesStore!.current = null;\n    this.ngOnChanges(current);\n  }\n}\n\n\nfunction ngOnChangesSetInput<T>(\n    this: DirectiveDef<T>, instance: T, inputSignalNode: null|InputSignalNode<unknown, unknown>,\n    value: unknown, publicName: string, privateName: string): void {\n  const declaredName = (this.declaredInputs as {[key: string]: string})[publicName];\n  ngDevMode && assertString(declaredName, 'Name of input in ngOnChanges has to be a string');\n  const simpleChangesStore = getSimpleChangesStore(instance) ||\n      setSimpleChangesStore(instance, {previous: EMPTY_OBJ, current: null});\n  const current = simpleChangesStore.current || (simpleChangesStore.current = {});\n  const previous = simpleChangesStore.previous;\n  const previousChange = previous[declaredName];\n  current[declaredName] = new SimpleChange(\n      previousChange && previousChange.currentValue, value, previous === EMPTY_OBJ);\n\n  applyValueToInputField(instance, inputSignalNode, privateName, value);\n}\n\nconst SIMPLE_CHANGES_STORE = '__ngSimpleChanges__';\n\nfunction getSimpleChangesStore(instance: any): null|NgSimpleChangesStore {\n  return instance[SIMPLE_CHANGES_STORE] || null;\n}\n\nfunction setSimpleChangesStore(instance: any, store: NgSimpleChangesStore): NgSimpleChangesStore {\n  return instance[SIMPLE_CHANGES_STORE] = store;\n}\n\n/**\n * Data structure which is monkey-patched on the component instance and used by `ngOnChanges`\n * life-cycle hook to track previous input values.\n */\ninterface NgSimpleChangesStore {\n  previous: SimpleChanges;\n  current: SimpleChanges|null;\n}\n"]}