@angular/core
Version:
Angular - the core framework
84 lines • 15.5 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 { ɵɵdefineInjectable } from '../../di/interface/defs';
import { Optional, SkipSelf } from '../../di/metadata';
import { DefaultIterableDifferFactory } from '../differs/default_iterable_differ';
/**
* A repository of different iterable diffing strategies used by NgFor, NgClass, and others.
*
* @publicApi
*/
var IterableDiffers = /** @class */ (function () {
function IterableDiffers(factories) {
this.factories = factories;
}
IterableDiffers.create = function (factories, parent) {
if (parent != null) {
var 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()])
* ]
* })
* ```
*/
IterableDiffers.extend = function (factories) {
return {
provide: IterableDiffers,
useFactory: function (parent) {
if (!parent) {
// Typically would occur when calling IterableDiffers.extend inside of dependencies passed
// to
// bootstrap(), which would override default pipes instead of extending them.
throw new Error('Cannot extend IterableDiffers without a parent injector');
}
return IterableDiffers.create(factories, parent);
},
// Dependency technically isn't optional, but we can provide a better error message this way.
deps: [[IterableDiffers, new SkipSelf(), new Optional()]]
};
};
IterableDiffers.prototype.find = function (iterable) {
var factory = this.factories.find(function (f) { return f.supports(iterable); });
if (factory != null) {
return factory;
}
else {
throw new Error("Cannot find a differ supporting object '" + iterable + "' of type '" + getTypeNameForDebugging(iterable) + "'");
}
};
/** @nocollapse */
IterableDiffers.ɵprov = ɵɵdefineInjectable({
token: IterableDiffers,
providedIn: 'root',
factory: function () { return new IterableDiffers([new DefaultIterableDifferFactory()]); }
});
return IterableDiffers;
}());
export { IterableDiffers };
export function getTypeNameForDebugging(type) {
return type['name'] || typeof type;
}
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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ɵɵdefineInjectable} from '../../di/interface/defs';\nimport {StaticProvider} from '../../di/interface/provider';\nimport {Optional, SkipSelf} from '../../di/metadata';\nimport {DefaultIterableDifferFactory} from '../differs/default_iterable_differ';\n\n\n\n/**\n * A type describing supported iterable types.\n *\n * @publicApi\n */\nexport type NgIterable<T> = Array<T>|Iterable<T>;\n\n/**\n * A strategy for tracking changes over time to an iterable. 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>, previousIndex: number|null,\n           currentIndex: number|null) => void): 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 * @deprecated v4.0.0 - Use IterableChangeRecord instead.\n * @publicApi\n */\nexport interface CollectionChangeRecord<V> extends IterableChangeRecord<V> {}\n\n/**\n * An optional function passed into the `NgForOf` directive that defines how to track\n * changes for items in an iterable.\n * The function takes the iteration index and item ID.\n * When supplied, Angular tracks changes by the return value of the function.\n *\n * @publicApi\n */\nexport interface TrackByFunction<T> {\n  (index: number, item: T): 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\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 = ɵɵdefineInjectable({\n    token: IterableDiffers,\n    providedIn: 'root',\n    factory: () => new IterableDiffers([new DefaultIterableDifferFactory()])\n  });\n\n  /**\n   * @deprecated v4.0.0 - Should be private\n   */\n  factories: IterableDifferFactory[];\n  constructor(factories: IterableDifferFactory[]) {\n    this.factories = factories;\n  }\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) => {\n        if (!parent) {\n          // Typically would occur when calling IterableDiffers.extend inside of dependencies passed\n          // to\n          // bootstrap(), which would override default pipes instead of extending them.\n          throw new Error('Cannot extend IterableDiffers without a parent injector');\n        }\n        return IterableDiffers.create(factories, parent);\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 Error(`Cannot find a differ supporting object '${iterable}' of type '${\n          getTypeNameForDebugging(iterable)}'`);\n    }\n  }\n}\n\nexport function getTypeNameForDebugging(type: any): string {\n  return type['name'] || typeof type;\n}\n"]}