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Diffstat (limited to 'deprecated-workflow-designer/sdc-workflow-designer-ui/src/app/paletx/core/overlay/scroll/close-scroll-strategy.ts')
-rw-r--r-- | deprecated-workflow-designer/sdc-workflow-designer-ui/src/app/paletx/core/overlay/scroll/close-scroll-strategy.ts | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/deprecated-workflow-designer/sdc-workflow-designer-ui/src/app/paletx/core/overlay/scroll/close-scroll-strategy.ts b/deprecated-workflow-designer/sdc-workflow-designer-ui/src/app/paletx/core/overlay/scroll/close-scroll-strategy.ts new file mode 100644 index 00000000..51189dc1 --- /dev/null +++ b/deprecated-workflow-designer/sdc-workflow-designer-ui/src/app/paletx/core/overlay/scroll/close-scroll-strategy.ts @@ -0,0 +1,54 @@ +/** + * @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 + */ +/* tslint:disable:array-type member-access variable-name typedef + only-arrow-functions directive-class-suffix component-class-suffix + component-selector*/ +import {Subscription} from 'rxjs/Subscription'; + +import {OverlayRef} from '../overlay-ref'; + +import {ScrollDispatcher} from './scroll-dispatcher'; +import {getMdScrollStrategyAlreadyAttachedError, ScrollStrategy} from './scroll-strategy'; + + +/** + * Strategy that will close the overlay as soon as the user starts scrolling. + */ +export class CloseScrollStrategy implements ScrollStrategy { + private _scrollSubscription: Subscription|null = null; + private _overlayRef: OverlayRef; + + constructor(private _scrollDispatcher: ScrollDispatcher) {} + + attach(overlayRef: OverlayRef) { + if (this._overlayRef) { + throw getMdScrollStrategyAlreadyAttachedError(); + } + + this._overlayRef = overlayRef; + } + + enable() { + if (!this._scrollSubscription) { + this._scrollSubscription = this._scrollDispatcher.scrolled(0, () => { + if (this._overlayRef.hasAttached()) { + this._overlayRef.detach(); + } + + this.disable(); + }); + } + } + + disable() { + if (this._scrollSubscription) { + this._scrollSubscription.unsubscribe(); + this._scrollSubscription = null; + } + } +} |