/**
 * @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 { Platform } from '@angular/cdk/platform';
import { Injectable, NgZone, Optional, Inject } from '@angular/core';
import { Subject } from 'rxjs';
import { auditTime } from 'rxjs/operators';
import { DOCUMENT } from '@angular/common';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/platform";
import * as i2 from "@angular/common";
/** Time in ms to throttle the resize events by default. */
export const DEFAULT_RESIZE_TIME = 20;
/**
 * Simple utility for getting the bounds of the browser viewport.
 * @docs-private
 */
export class ViewportRuler {
    constructor(_platform, ngZone, document) {
        this._platform = _platform;
        /** Stream of viewport change events. */
        this._change = new Subject();
        /** Event listener that will be used to handle the viewport change events. */
        this._changeListener = (event) => {
            this._change.next(event);
        };
        this._document = document;
        ngZone.runOutsideAngular(() => {
            if (_platform.isBrowser) {
                const window = this._getWindow();
                // Note that bind the events ourselves, rather than going through something like RxJS's
                // `fromEvent` so that we can ensure that they're bound outside of the NgZone.
                window.addEventListener('resize', this._changeListener);
                window.addEventListener('orientationchange', this._changeListener);
            }
            // Clear the cached position so that the viewport is re-measured next time it is required.
            // We don't need to keep track of the subscription, because it is completed on destroy.
            this.change().subscribe(() => this._viewportSize = null);
        });
    }
    ngOnDestroy() {
        if (this._platform.isBrowser) {
            const window = this._getWindow();
            window.removeEventListener('resize', this._changeListener);
            window.removeEventListener('orientationchange', this._changeListener);
        }
        this._change.complete();
    }
    /** Returns the viewport's width and height. */
    getViewportSize() {
        if (!this._viewportSize) {
            this._updateViewportSize();
        }
        const output = { width: this._viewportSize.width, height: this._viewportSize.height };
        // If we're not on a browser, don't cache the size since it'll be mocked out anyway.
        if (!this._platform.isBrowser) {
            this._viewportSize = null;
        }
        return output;
    }
    /** Gets a ClientRect for the viewport's bounds. */
    getViewportRect() {
        // Use the document element's bounding rect rather than the window scroll properties
        // (e.g. pageYOffset, scrollY) due to in issue in Chrome and IE where window scroll
        // properties and client coordinates (boundingClientRect, clientX/Y, etc.) are in different
        // conceptual viewports. Under most circumstances these viewports are equivalent, but they
        // can disagree when the page is pinch-zoomed (on devices that support touch).
        // See https://bugs.chromium.org/p/chromium/issues/detail?id=489206#c4
        // We use the documentElement instead of the body because, by default (without a css reset)
        // browsers typically give the document body an 8px margin, which is not included in
        // getBoundingClientRect().
        const scrollPosition = this.getViewportScrollPosition();
        const { width, height } = this.getViewportSize();
        return {
            top: scrollPosition.top,
            left: scrollPosition.left,
            bottom: scrollPosition.top + height,
            right: scrollPosition.left + width,
            height,
            width,
        };
    }
    /** Gets the (top, left) scroll position of the viewport. */
    getViewportScrollPosition() {
        // While we can get a reference to the fake document
        // during SSR, it doesn't have getBoundingClientRect.
        if (!this._platform.isBrowser) {
            return { top: 0, left: 0 };
        }
        // The top-left-corner of the viewport is determined by the scroll position of the document
        // body, normally just (scrollLeft, scrollTop). However, Chrome and Firefox disagree about
        // whether `document.body` or `document.documentElement` is the scrolled element, so reading
        // `scrollTop` and `scrollLeft` is inconsistent. However, using the bounding rect of
        // `document.documentElement` works consistently, where the `top` and `left` values will
        // equal negative the scroll position.
        const document = this._document;
        const window = this._getWindow();
        const documentElement = document.documentElement;
        const documentRect = documentElement.getBoundingClientRect();
        const top = -documentRect.top || document.body.scrollTop || window.scrollY ||
            documentElement.scrollTop || 0;
        const left = -documentRect.left || document.body.scrollLeft || window.scrollX ||
            documentElement.scrollLeft || 0;
        return { top, left };
    }
    /**
     * Returns a stream that emits whenever the size of the viewport changes.
     * This stream emits outside of the Angular zone.
     * @param throttleTime Time in milliseconds to throttle the stream.
     */
    change(throttleTime = DEFAULT_RESIZE_TIME) {
        return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change;
    }
    /** Use defaultView of injected document if available or fallback to global window reference */
    _getWindow() {
        return this._document.defaultView || window;
    }
    /** Updates the cached viewport size. */
    _updateViewportSize() {
        const window = this._getWindow();
        this._viewportSize = this._platform.isBrowser ?
            { width: window.innerWidth, height: window.innerHeight } :
            { width: 0, height: 0 };
    }
}
ViewportRuler.ɵprov = i0.ɵɵdefineInjectable({ factory: function ViewportRuler_Factory() { return new ViewportRuler(i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i2.DOCUMENT, 8)); }, token: ViewportRuler, providedIn: "root" });
ViewportRuler.decorators = [
    { type: Injectable, args: [{ providedIn: 'root' },] }
];
ViewportRuler.ctorParameters = () => [
    { type: Platform },
    { type: NgZone },
    { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] }
];
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height: number} | null;\n\n  /** Stream of viewport change events. */\n  private readonly _change = new Subject<Event>();\n\n  /** Event listener that will be used to handle the viewport change events. */\n  private _changeListener = (event: Event) => {\n    this._change.next(event);\n  }\n\n  /** Used to reference correct document/window */\n  protected _document: Document;\n\n  constructor(private _platform: Platform,\n              ngZone: NgZone,\n              @Optional() @Inject(DOCUMENT) document: any) {\n    this._document = document;\n\n    ngZone.runOutsideAngular(() => {\n      if (_platform.isBrowser) {\n        const window = this._getWindow();\n\n        // Note that bind the events ourselves, rather than going through something like RxJS's\n        // `fromEvent` so that we can ensure that they're bound outside of the NgZone.\n        window.addEventListener('resize', this._changeListener);\n        window.addEventListener('orientationchange', this._changeListener);\n      }\n\n      // Clear the cached position so that the viewport is re-measured next time it is required.\n      // We don't need to keep track of the subscription, because it is completed on destroy.\n      this.change().subscribe(() => this._viewportSize = null);\n    });\n  }\n\n  ngOnDestroy() {\n    if (this._platform.isBrowser) {\n      const window = this._getWindow();\n      window.removeEventListener('resize', this._changeListener);\n      window.removeEventListener('orientationchange', this._changeListener);\n    }\n\n    this._change.complete();\n  }\n\n  /** Returns the viewport's width and height. */\n  getViewportSize(): Readonly<{width: number, height: number}> {\n    if (!this._viewportSize) {\n      this._updateViewportSize();\n    }\n\n    const output = {width: this._viewportSize!.width, height: this._viewportSize!.height};\n\n    // If we're not on a browser, don't cache the size since it'll be mocked out anyway.\n    if (!this._platform.isBrowser) {\n      this._viewportSize = null!;\n    }\n\n    return output;\n  }\n\n  /** Gets a ClientRect for the viewport's bounds. */\n  getViewportRect(): ClientRect {\n    // Use the document element's bounding rect rather than the window scroll properties\n    // (e.g. pageYOffset, scrollY) due to in issue in Chrome and IE where window scroll\n    // properties and client coordinates (boundingClientRect, clientX/Y, etc.) are in different\n    // conceptual viewports. Under most circumstances these viewports are equivalent, but they\n    // can disagree when the page is pinch-zoomed (on devices that support touch).\n    // See https://bugs.chromium.org/p/chromium/issues/detail?id=489206#c4\n    // We use the documentElement instead of the body because, by default (without a css reset)\n    // browsers typically give the document body an 8px margin, which is not included in\n    // getBoundingClientRect().\n    const scrollPosition = this.getViewportScrollPosition();\n    const {width, height} = this.getViewportSize();\n\n    return {\n      top: scrollPosition.top,\n      left: scrollPosition.left,\n      bottom: scrollPosition.top + height,\n      right: scrollPosition.left + width,\n      height,\n      width,\n    };\n  }\n\n  /** Gets the (top, left) scroll position of the viewport. */\n  getViewportScrollPosition(): ViewportScrollPosition {\n    // While we can get a reference to the fake document\n    // during SSR, it doesn't have getBoundingClientRect.\n    if (!this._platform.isBrowser) {\n      return {top: 0, left: 0};\n    }\n\n    // The top-left-corner of the viewport is determined by the scroll position of the document\n    // body, normally just (scrollLeft, scrollTop). However, Chrome and Firefox disagree about\n    // whether `document.body` or `document.documentElement` is the scrolled element, so reading\n    // `scrollTop` and `scrollLeft` is inconsistent. However, using the bounding rect of\n    // `document.documentElement` works consistently, where the `top` and `left` values will\n    // equal negative the scroll position.\n    const document = this._document;\n    const window = this._getWindow();\n    const documentElement = document.documentElement!;\n    const documentRect = documentElement.getBoundingClientRect();\n\n    const top = -documentRect.top || document.body.scrollTop || window.scrollY ||\n                 documentElement.scrollTop || 0;\n\n    const left = -documentRect.left || document.body.scrollLeft || window.scrollX ||\n                  documentElement.scrollLeft || 0;\n\n    return {top, left};\n  }\n\n  /**\n   * Returns a stream that emits whenever the size of the viewport changes.\n   * This stream emits outside of the Angular zone.\n   * @param throttleTime Time in milliseconds to throttle the stream.\n   */\n  change(throttleTime: number = DEFAULT_RESIZE_TIME): Observable<Event> {\n    return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change;\n  }\n\n  /** Use defaultView of injected document if available or fallback to global window reference */\n  private _getWindow(): Window {\n    return this._document.defaultView || window;\n  }\n\n  /** Updates the cached viewport size. */\n  private _updateViewportSize() {\n    const window = this._getWindow();\n    this._viewportSize = this._platform.isBrowser ?\n        {width: window.innerWidth, height: window.innerHeight} :\n        {width: 0, height: 0};\n  }\n}\n"]}