@angular/core
Version:
Angular - the core framework
84 lines • 18 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 { ɵɵdefineInjectable } from '../../di/interface/defs';
import { Optional, SkipSelf } from '../../di/metadata';
import { RuntimeError } from '../../errors';
import { DefaultIterableDifferFactory } from '../differs/default_iterable_differ';
export function defaultIterableDiffersFactory() {
return new IterableDiffers([new DefaultIterableDifferFactory()]);
}
/**
* A repository of different iterable diffing strategies used by NgFor, NgClass, and others.
*
* @publicApi
*/
export class IterableDiffers {
/** @nocollapse */
static { this.ɵprov = ɵɵdefineInjectable({
token: IterableDiffers,
providedIn: 'root',
factory: defaultIterableDiffersFactory,
}); }
constructor(factories) {
this.factories = factories;
}
static create(factories, parent) {
if (parent != null) {
const copied = parent.factories.slice();
factories = factories.concat(copied);
}
return new IterableDiffers(factories);
}
/**
* Takes an array of {@link IterableDifferFactory} and returns a provider used to extend the
* inherited {@link IterableDiffers} instance with the provided factories and return a new
* {@link IterableDiffers} 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 IterableDiffer} available.
*
* ```
* @Component({
* viewProviders: [
* IterableDiffers.extend([new ImmutableListDiffer()])
* ]
* })
* ```
*/
static extend(factories) {
return {
provide: IterableDiffers,
useFactory: (parent) => {
// if parent is null, it means that we are in the root injector and we have just overridden
// the default injection mechanism for IterableDiffers, in such a case just assume
// `defaultIterableDiffersFactory`.
return IterableDiffers.create(factories, parent || defaultIterableDiffersFactory());
},
// Dependency technically isn't optional, but we can provide a better error message this way.
deps: [[IterableDiffers, new SkipSelf(), new Optional()]],
};
}
find(iterable) {
const factory = this.factories.find((f) => f.supports(iterable));
if (factory != null) {
return factory;
}
else {
throw new RuntimeError(901 /* RuntimeErrorCode.NO_SUPPORTING_DIFFER_FACTORY */, ngDevMode &&
`Cannot find a differ supporting object '${iterable}' of type '${getTypeNameForDebugging(iterable)}'`);
}
}
}
export function getTypeNameForDebugging(type) {
return type['name'] || typeof type;
}
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Used by {@link NgForOf} to\n * respond to changes in an iterable by effecting equivalent changes in the DOM.\n *\n * @publicApi\n */\nexport interface IterableDiffer<V> {\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: NgIterable<V> | undefined | null): IterableChanges<V> | null;\n}\n\n/**\n * An object describing the changes in the `Iterable` collection since last time\n * `IterableDiffer#diff()` was invoked.\n *\n * @publicApi\n */\nexport interface IterableChanges<V> {\n  /**\n   * Iterate over all changes. `IterableChangeRecord` will contain information about changes\n   * to each item.\n   */\n  forEachItem(fn: (record: IterableChangeRecord<V>) => void): void;\n\n  /**\n   * Iterate over a set of operations which when applied to the original `Iterable` will produce the\n   * new `Iterable`.\n   *\n   * NOTE: These are not necessarily the actual operations which were applied to the original\n   * `Iterable`, rather these are a set of computed operations which may not be the same as the\n   * ones applied.\n   *\n   * @param record A change which needs to be applied\n   * @param previousIndex The `IterableChangeRecord#previousIndex` of the `record` refers to the\n   *        original `Iterable` location, where as `previousIndex` refers to the transient location\n   *        of the item, after applying the operations up to this point.\n   * @param currentIndex The `IterableChangeRecord#currentIndex` of the `record` refers to the\n   *        original `Iterable` location, where as `currentIndex` refers to the transient location\n   *        of the item, after applying the operations up to this point.\n   */\n  forEachOperation(\n    fn: (\n      record: IterableChangeRecord<V>,\n      previousIndex: number | null,\n      currentIndex: number | null,\n    ) => void,\n  ): void;\n\n  /**\n   * Iterate over changes in the order of original `Iterable` showing where the original items\n   * have moved.\n   */\n  forEachPreviousItem(fn: (record: IterableChangeRecord<V>) => void): void;\n\n  /** Iterate over all added items. */\n  forEachAddedItem(fn: (record: IterableChangeRecord<V>) => void): void;\n\n  /** Iterate over all moved items. */\n  forEachMovedItem(fn: (record: IterableChangeRecord<V>) => void): void;\n\n  /** Iterate over all removed items. */\n  forEachRemovedItem(fn: (record: IterableChangeRecord<V>) => void): void;\n\n  /**\n   * Iterate over all items which had their identity (as computed by the `TrackByFunction`)\n   * changed.\n   */\n  forEachIdentityChange(fn: (record: IterableChangeRecord<V>) => void): void;\n}\n\n/**\n * Record representing the item change information.\n *\n * @publicApi\n */\nexport interface IterableChangeRecord<V> {\n  /** Current index of the item in `Iterable` or null if removed. */\n  readonly currentIndex: number | null;\n\n  /** Previous index of the item in `Iterable` or null if added. */\n  readonly previousIndex: number | null;\n\n  /** The item. */\n  readonly item: V;\n\n  /** Track by identity as computed by the `TrackByFunction`. */\n  readonly trackById: any;\n}\n\n/**\n * A function optionally passed into the `NgForOf` directive to customize how `NgForOf` uniquely\n * identifies items in an iterable.\n *\n * `NgForOf` needs to uniquely identify items in the iterable to correctly perform DOM updates\n * when items in the iterable are reordered, new items are added, or existing items are removed.\n *\n *\n * In all of these scenarios it is usually desirable to only update the DOM elements associated\n * with the items affected by the change. This behavior is important to:\n *\n * - preserve any DOM-specific UI state (like cursor position, focus, text selection) when the\n *   iterable is modified\n * - enable animation of item addition, removal, and iterable reordering\n * - preserve the value of the `<select>` element when nested `<option>` elements are dynamically\n *   populated using `NgForOf` and the bound iterable is updated\n *\n * A common use for custom `trackBy` functions is when the model that `NgForOf` iterates over\n * contains a property with a unique identifier. For example, given a model:\n *\n * ```ts\n * class User {\n *   id: number;\n *   name: string;\n *   ...\n * }\n * ```\n * a custom `trackBy` function could look like the following:\n * ```ts\n * function userTrackBy(index, user) {\n *   return user.id;\n * }\n * ```\n *\n * A custom `trackBy` function must have several properties:\n *\n * - be [idempotent](https://en.wikipedia.org/wiki/Idempotence) (be without side effects, and always\n * return the same value for a given input)\n * - return unique value for all unique inputs\n * - be fast\n *\n * @see [`NgForOf#ngForTrackBy`](api/common/NgForOf#ngForTrackBy)\n * @publicApi\n */\nexport interface TrackByFunction<T> {\n  // Note: the type parameter `U` enables more accurate template type checking in case a trackBy\n  // function is declared using a base type of the iterated type. The `U` type gives TypeScript\n  // additional freedom to infer a narrower type for the `item` parameter type, instead of imposing\n  // the trackBy's declared item type as the inferred type for `T`.\n  // See https://github.com/angular/angular/issues/40125\n\n  /**\n   * @param index The index of the item within the iterable.\n   * @param item The item in the iterable.\n   */\n  <U extends T>(index: number, item: T & U): any;\n}\n\n/**\n * Provides a factory for {@link IterableDiffer}.\n *\n * @publicApi\n */\nexport interface IterableDifferFactory {\n  supports(objects: any): boolean;\n  create<V>(trackByFn?: TrackByFunction<V>): IterableDiffer<V>;\n}\n\nexport function defaultIterableDiffersFactory() {\n  return new IterableDiffers([new DefaultIterableDifferFactory()]);\n}\n\n/**\n * A repository of different iterable diffing strategies used by NgFor, NgClass, and others.\n *\n * @publicApi\n */\nexport class IterableDiffers {\n  /** @nocollapse */\n  static ɵprov = /** @pureOrBreakMyCode */ ɵɵdefineInjectable({\n    token: IterableDiffers,\n    providedIn: 'root',\n    factory: defaultIterableDiffersFactory,\n  });\n\n  constructor(private factories: IterableDifferFactory[]) {}\n\n  static create(factories: IterableDifferFactory[], parent?: IterableDiffers): IterableDiffers {\n    if (parent != null) {\n      const copied = parent.factories.slice();\n      factories = factories.concat(copied);\n    }\n\n    return new IterableDiffers(factories);\n  }\n\n  /**\n   * Takes an array of {@link IterableDifferFactory} and returns a provider used to extend the\n   * inherited {@link IterableDiffers} instance with the provided factories and return a new\n   * {@link IterableDiffers} 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 IterableDiffer} available.\n   *\n   * ```\n   * @Component({\n   *   viewProviders: [\n   *     IterableDiffers.extend([new ImmutableListDiffer()])\n   *   ]\n   * })\n   * ```\n   */\n  static extend(factories: IterableDifferFactory[]): StaticProvider {\n    return {\n      provide: IterableDiffers,\n      useFactory: (parent: IterableDiffers | null) => {\n        // if parent is null, it means that we are in the root injector and we have just overridden\n        // the default injection mechanism for IterableDiffers, in such a case just assume\n        // `defaultIterableDiffersFactory`.\n        return IterableDiffers.create(factories, parent || defaultIterableDiffersFactory());\n      },\n      // Dependency technically isn't optional, but we can provide a better error message this way.\n      deps: [[IterableDiffers, new SkipSelf(), new Optional()]],\n    };\n  }\n\n  find(iterable: any): IterableDifferFactory {\n    const factory = this.factories.find((f) => f.supports(iterable));\n    if (factory != null) {\n      return factory;\n    } else {\n      throw new RuntimeError(\n        RuntimeErrorCode.NO_SUPPORTING_DIFFER_FACTORY,\n        ngDevMode &&\n          `Cannot find a differ supporting object '${iterable}' of type '${getTypeNameForDebugging(\n            iterable,\n          )}'`,\n      );\n    }\n  }\n}\n\nexport function getTypeNameForDebugging(type: any): string {\n  return type['name'] || typeof type;\n}\n"]}