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| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { Observable } from 'rxjs';
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| 9 | /** Represents a range of numbers with a specified start and end. */
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| 10 | export declare type ListRange = {
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| 11 | start: number;
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| 12 | end: number;
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| 13 | };
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| 14 | /**
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| 15 | * Interface for any component that provides a view of some data collection and wants to provide
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| 16 | * information regarding the view and any changes made.
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| 17 | */
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| 18 | export interface CollectionViewer {
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| 19 | /**
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| 20 | * A stream that emits whenever the `CollectionViewer` starts looking at a new portion of the
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| 21 | * data. The `start` index is inclusive, while the `end` is exclusive.
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| 22 | */
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| 23 | viewChange: Observable<ListRange>;
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| 24 | }
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