@angular/core
Version:
Angular - the core framework
75 lines • 12.1 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 { Optional, SkipSelf, ɵɵdefineInjectable } from '../../di';
import { DefaultKeyValueDifferFactory } from './default_keyvalue_differ';
/**
* A repository of different Map diffing strategies used by NgClass, NgStyle, and others.
*
* @publicApi
*/
export class KeyValueDiffers {
constructor(factories) {
this.factories = factories;
}
static create(factories, parent) {
if (parent) {
const copied = parent.factories.slice();
factories = factories.concat(copied);
}
return new KeyValueDiffers(factories);
}
/**
* Takes an array of {@link KeyValueDifferFactory} and returns a provider used to extend the
* inherited {@link KeyValueDiffers} instance with the provided factories and return a new
* {@link KeyValueDiffers} instance.
*
* @usageNotes
* ### Example
*
* The following example shows how to extend an existing list of factories,
* which will only be applied to the injector for this component and its children.
* This step is all that's required to make a new {@link KeyValueDiffer} available.
*
* ```
* @Component({
* viewProviders: [
* KeyValueDiffers.extend([new ImmutableMapDiffer()])
* ]
* })
* ```
*/
static extend(factories) {
return {
provide: KeyValueDiffers,
useFactory: (parent) => {
if (!parent) {
// Typically would occur when calling KeyValueDiffers.extend inside of dependencies passed
// to bootstrap(), which would override default pipes instead of extending them.
throw new Error('Cannot extend KeyValueDiffers without a parent injector');
}
return KeyValueDiffers.create(factories, parent);
},
// Dependency technically isn't optional, but we can provide a better error message this way.
deps: [[KeyValueDiffers, new SkipSelf(), new Optional()]]
};
}
find(kv) {
const factory = this.factories.find(f => f.supports(kv));
if (factory) {
return factory;
}
throw new Error(`Cannot find a differ supporting object '${kv}'`);
}
}
/** @nocollapse */
KeyValueDiffers.ɵprov = ɵɵdefineInjectable({
token: KeyValueDiffers,
providedIn: 'root',
factory: () => new KeyValueDiffers([new DefaultKeyValueDifferFactory()])
});
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The return value is only valid until the next\n   * `diff()` invocation.\n   */\n  diff(object: Map<K, V>): KeyValueChanges<K, V>|null;\n\n  /**\n   * Compute a difference between the previous state and the new `object` state.\n   *\n   * @param object containing the new value.\n   * @returns an object describing the difference. The return value is only valid until the next\n   * `diff()` invocation.\n   */\n  diff(object: {[key: string]: V}): KeyValueChanges<string, V>|null;\n  // TODO(TS2.1): diff<KP extends string>(this: KeyValueDiffer<KP, V>, object: Record<KP, V>):\n  // KeyValueDiffer<KP, V>;\n}\n\n/**\n * An object describing the changes in the `Map` or `{[k:string]: string}` since last time\n * `KeyValueDiffer#diff()` was invoked.\n *\n * @publicApi\n */\nexport interface KeyValueChanges<K, V> {\n  /**\n   * Iterate over all changes. `KeyValueChangeRecord` will contain information about changes\n   * to each item.\n   */\n  forEachItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n\n  /**\n   * Iterate over changes in the order of original Map showing where the original items\n   * have moved.\n   */\n  forEachPreviousItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n\n  /**\n   * Iterate over all keys for which values have changed.\n   */\n  forEachChangedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n\n  /**\n   * Iterate over all added items.\n   */\n  forEachAddedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n\n  /**\n   * Iterate over all removed items.\n   */\n  forEachRemovedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n}\n\n/**\n * Record representing the item change information.\n *\n * @publicApi\n */\nexport interface KeyValueChangeRecord<K, V> {\n  /**\n   * Current key in the Map.\n   */\n  readonly key: K;\n\n  /**\n   * Current value for the key or `null` if removed.\n   */\n  readonly currentValue: V|null;\n\n  /**\n   * Previous value for the key or `null` if added.\n   */\n  readonly previousValue: V|null;\n}\n\n/**\n * Provides a factory for {@link KeyValueDiffer}.\n *\n * @publicApi\n */\nexport interface KeyValueDifferFactory {\n  /**\n   * Test to see if the differ knows how to diff this kind of object.\n   */\n  supports(objects: any): boolean;\n\n  /**\n   * Create a `KeyValueDiffer`.\n   */\n  create<K, V>(): KeyValueDiffer<K, V>;\n}\n\n/**\n * A repository of different Map diffing strategies used by NgClass, NgStyle, and others.\n *\n * @publicApi\n */\nexport class KeyValueDiffers {\n  /** @nocollapse */\n  static ɵprov = ɵɵdefineInjectable({\n    token: KeyValueDiffers,\n    providedIn: 'root',\n    factory: () => new KeyValueDiffers([new DefaultKeyValueDifferFactory()])\n  });\n\n  /**\n   * @deprecated v4.0.0 - Should be private.\n   */\n  factories: KeyValueDifferFactory[];\n\n  constructor(factories: KeyValueDifferFactory[]) {\n    this.factories = factories;\n  }\n\n  static create<S>(factories: KeyValueDifferFactory[], parent?: KeyValueDiffers): KeyValueDiffers {\n    if (parent) {\n      const copied = parent.factories.slice();\n      factories = factories.concat(copied);\n    }\n    return new KeyValueDiffers(factories);\n  }\n\n  /**\n   * Takes an array of {@link KeyValueDifferFactory} and returns a provider used to extend the\n   * inherited {@link KeyValueDiffers} instance with the provided factories and return a new\n   * {@link KeyValueDiffers} instance.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * The following example shows how to extend an existing list of factories,\n   * which will only be applied to the injector for this component and its children.\n   * This step is all that's required to make a new {@link KeyValueDiffer} available.\n   *\n   * ```\n   * @Component({\n   *   viewProviders: [\n   *     KeyValueDiffers.extend([new ImmutableMapDiffer()])\n   *   ]\n   * })\n   * ```\n   */\n  static extend<S>(factories: KeyValueDifferFactory[]): StaticProvider {\n    return {\n      provide: KeyValueDiffers,\n      useFactory: (parent: KeyValueDiffers) => {\n        if (!parent) {\n          // Typically would occur when calling KeyValueDiffers.extend inside of dependencies passed\n          // to bootstrap(), which would override default pipes instead of extending them.\n          throw new Error('Cannot extend KeyValueDiffers without a parent injector');\n        }\n        return KeyValueDiffers.create(factories, parent);\n      },\n      // Dependency technically isn't optional, but we can provide a better error message this way.\n      deps: [[KeyValueDiffers, new SkipSelf(), new Optional()]]\n    };\n  }\n\n  find(kv: any): KeyValueDifferFactory {\n    const factory = this.factories.find(f => f.supports(kv));\n    if (factory) {\n      return factory;\n    }\n    throw new Error(`Cannot find a differ supporting object '${kv}'`);\n  }\n}\n"]}