| /** |
| * @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 { OverlayReference } from '../overlay-reference'; |
| /** |
| * Describes a strategy that will be used by an overlay to handle scroll events while it is open. |
| */ |
| export interface ScrollStrategy { |
| /** Enable this scroll strategy (called when the attached overlay is attached to a portal). */ |
| enable: () => void; |
| /** Disable this scroll strategy (called when the attached overlay is detached from a portal). */ |
| disable: () => void; |
| /** Attaches this `ScrollStrategy` to an overlay. */ |
| attach: (overlayRef: OverlayReference) => void; |
| /** Detaches the scroll strategy from the current overlay. */ |
| detach?: () => void; |
| } |
| /** |
| * Returns an error to be thrown when attempting to attach an already-attached scroll strategy. |
| */ |
| export declare function getMatScrollStrategyAlreadyAttachedError(): Error; |