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fix(ivy): determine value of SimpleChange.firstChange per property (#24152) 

PR Close #24152
This commit is contained in:
JoostK 2018-05-27 14:19:58 +02:00 committed by Victor Berchet
parent 7e3f8f77a9
commit a5c47d0045
2 changed files with 89 additions and 23 deletions
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33
packages/core/src/render3/definition.ts
View File

@ -253,32 +253,33 @@ export function NgOnChangesFeature(inputPropertyNames?: {[key: string]: string})
return function(definition: DirectiveDef<any>): void {
const inputs = definition.inputs;
const proto = definition.type.prototype;
// Place where we will store SimpleChanges if there is a change
Object.defineProperty(proto, PRIVATE_PREFIX, {value: undefined, writable: true});
for (let pubKey in inputs) {
const minKey = inputs[pubKey];
const propertyName = inputPropertyNames && inputPropertyNames[minKey] || pubKey;
const privateMinKey = PRIVATE_PREFIX + minKey;
// Create a place where the actual value will be stored and make it non-enumerable
Object.defineProperty(proto, privateMinKey, {value: undefined, writable: true});
const existingDesc = Object.getOwnPropertyDescriptor(proto, minKey);
const originalProperty = Object.getOwnPropertyDescriptor(proto, minKey);
const getter = originalProperty && originalProperty.get;
const setter = originalProperty && originalProperty.set;
// create a getter and setter for property
Object.defineProperty(proto, minKey, {
get: function(this: OnChangesExpando) {
return (existingDesc && existingDesc.get) ? existingDesc.get.call(this) :
this[privateMinKey];
},
get: getter ||
(setter ? undefined : function(this: OnChangesExpando) { return this[privateMinKey]; }),
set: function(this: OnChangesExpando, value: any) {
let simpleChanges = this[PRIVATE_PREFIX];
let isFirstChange = simpleChanges === undefined;
if (simpleChanges == null) {
simpleChanges = this[PRIVATE_PREFIX] = {};
if (!simpleChanges) {
// Place where we will store SimpleChanges if there is a change
Object.defineProperty(
this, PRIVATE_PREFIX, {value: simpleChanges = {}, writable: true});
}
const isFirstChange = !this.hasOwnProperty(privateMinKey);
simpleChanges[propertyName] = new SimpleChange(this[privateMinKey], value, isFirstChange);
(existingDesc && existingDesc.set) ? existingDesc.set.call(this, value) :
this[privateMinKey] = value;
if (isFirstChange) {
// Create a place where the actual value will be stored and make it non-enumerable
Object.defineProperty(this, privateMinKey, {value, writable: true});
} else {
this[privateMinKey] = value;
}
setter && setter.call(this, value);
}
});
}

79
packages/core/test/render3/define_spec.ts
View File

@ -6,7 +6,7 @@
* found in the LICENSE file at https://angular.io/license
*/
import {DoCheck, OnChanges, SimpleChanges} from '../../src/core';
import {DoCheck, OnChanges, SimpleChange, SimpleChanges} from '../../src/core';
import {DirectiveDef, NgOnChangesFeature, defineDirective} from '../../src/render3/index';
describe('define', () => {
@ -14,7 +14,7 @@ describe('define', () => {
describe('NgOnChangesFeature', () => {
it('should patch class', () => {
class MyDirective implements OnChanges, DoCheck {
public log: string[] = [];
public log: Array<string|SimpleChange> = [];
public valA: string = 'initValue';
public set valB(value: string) { this.log.push(value); }
@ -23,8 +23,8 @@ describe('define', () => {
ngDoCheck(): void { this.log.push('ngDoCheck'); }
ngOnChanges(changes: SimpleChanges): void {
this.log.push('ngOnChanges');
this.log.push('valA', changes['valA'].previousValue, changes['valA'].currentValue);
this.log.push('valB', changes['valB'].previousValue, changes['valB'].currentValue);
this.log.push('valA', changes['valA']);
this.log.push('valB', changes['valB']);
}
static ngDirectiveDef = defineDirective({
@ -45,9 +45,74 @@ describe('define', () => {
expect(myDir.valB).toEqual('works');
myDir.log.length = 0;
(MyDirective.ngDirectiveDef as DirectiveDef<MyDirective>).doCheck !.call(myDir);
expect(myDir.log).toEqual([
'ngOnChanges', 'valA', 'initValue', 'first', 'valB', undefined, 'second', 'ngDoCheck'
]);
const changeA = new SimpleChange('initValue', 'first', false);
const changeB = new SimpleChange(undefined, 'second', true);
expect(myDir.log).toEqual(['ngOnChanges', 'valA', changeA, 'valB', changeB, 'ngDoCheck']);
});
it('correctly computes firstChange', () => {
class MyDirective implements OnChanges {
public log: Array<string|SimpleChange> = [];
public valA: string = 'initValue';
public valB: string;
ngOnChanges(changes: SimpleChanges): void {
this.log.push('valA', changes['valA']);
this.log.push('valB', changes['valB']);
}
static ngDirectiveDef = defineDirective({
type: MyDirective,
selectors: [['', 'myDir', '']],
factory: () => new MyDirective(),
features: [NgOnChangesFeature()],
inputs: {valA: 'valA', valB: 'valB'}
});
}
const myDir =
(MyDirective.ngDirectiveDef as DirectiveDef<MyDirective>).factory() as MyDirective;
myDir.valA = 'first';
myDir.valB = 'second';
(MyDirective.ngDirectiveDef as DirectiveDef<MyDirective>).doCheck !.call(myDir);
const changeA1 = new SimpleChange('initValue', 'first', false);
const changeB1 = new SimpleChange(undefined, 'second', true);
expect(myDir.log).toEqual(['valA', changeA1, 'valB', changeB1]);
myDir.log.length = 0;
myDir.valA = 'third';
(MyDirective.ngDirectiveDef as DirectiveDef<MyDirective>).doCheck !.call(myDir);
const changeA2 = new SimpleChange('first', 'third', false);
expect(myDir.log).toEqual(['valA', changeA2, 'valB', undefined]);
});
it('should not create a getter when only a setter is originally defined', () => {
class MyDirective implements OnChanges {
public log: Array<string|SimpleChange> = [];
public set onlySetter(value: string) { this.log.push(value); }
ngOnChanges(changes: SimpleChanges): void {
this.log.push('ngOnChanges');
this.log.push('onlySetter', changes['onlySetter']);
}
static ngDirectiveDef = defineDirective({
type: MyDirective,
selectors: [['', 'myDir', '']],
factory: () => new MyDirective(),
features: [NgOnChangesFeature()],
inputs: {onlySetter: 'onlySetter'}
});
}
const myDir =
(MyDirective.ngDirectiveDef as DirectiveDef<MyDirective>).factory() as MyDirective;
myDir.onlySetter = 'someValue';
expect(myDir.onlySetter).toBeUndefined();
(MyDirective.ngDirectiveDef as DirectiveDef<MyDirective>).doCheck !.call(myDir);
const changeSetter = new SimpleChange(undefined, 'someValue', true);
expect(myDir.log).toEqual(['someValue', 'ngOnChanges', 'onlySetter', changeSetter]);
});
});
});