/** * @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 } from '@angular/core'; import { merge, of as observableOf, fromEvent } from 'rxjs'; import { auditTime } from 'rxjs/operators'; import * as i0 from "@angular/core"; import * as i1 from "@angular/cdk/platform"; /** Time in ms to throttle the resize events by default. */ export var DEFAULT_RESIZE_TIME = 20; /** * Simple utility for getting the bounds of the browser viewport. * @docs-private */ var ViewportRuler = /** @class */ (function () { function ViewportRuler(_platform, ngZone) { var _this = this; this._platform = _platform; ngZone.runOutsideAngular(function () { _this._change = _platform.isBrowser ? merge(fromEvent(window, 'resize'), fromEvent(window, 'orientationchange')) : observableOf(); // Note that we need to do the subscription inside `runOutsideAngular` // since subscribing is what causes the event listener to be added. _this._invalidateCache = _this.change().subscribe(function () { return _this._updateViewportSize(); }); }); } ViewportRuler.prototype.ngOnDestroy = function () { this._invalidateCache.unsubscribe(); }; /** Returns the viewport's width and height. */ ViewportRuler.prototype.getViewportSize = function () { if (!this._viewportSize) { this._updateViewportSize(); } var 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. */ ViewportRuler.prototype.getViewportRect = function () { // 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(). var scrollPosition = this.getViewportScrollPosition(); var _a = this.getViewportSize(), width = _a.width, height = _a.height; return { top: scrollPosition.top, left: scrollPosition.left, bottom: scrollPosition.top + height, right: scrollPosition.left + width, height: height, width: width, }; }; /** Gets the (top, left) scroll position of the viewport. */ ViewportRuler.prototype.getViewportScrollPosition = function () { // 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. var documentElement = document.documentElement; var documentRect = documentElement.getBoundingClientRect(); var top = -documentRect.top || document.body.scrollTop || window.scrollY || documentElement.scrollTop || 0; var left = -documentRect.left || document.body.scrollLeft || window.scrollX || documentElement.scrollLeft || 0; return { top: top, left: left }; }; /** * Returns a stream that emits whenever the size of the viewport changes. * @param throttleTime Time in milliseconds to throttle the stream. */ ViewportRuler.prototype.change = function (throttleTime) { if (throttleTime === void 0) { throttleTime = DEFAULT_RESIZE_TIME; } return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change; }; /** Updates the cached viewport size. */ ViewportRuler.prototype._updateViewportSize = function () { this._viewportSize = this._platform.isBrowser ? { width: window.innerWidth, height: window.innerHeight } : { width: 0, height: 0 }; 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height: number};\n\n  /** Stream of viewport change events. */\n  private _change: Observable<Event>;\n\n  /** Subscription to streams that invalidate the cached viewport dimensions. */\n  private _invalidateCache: Subscription;\n\n  constructor(private _platform: Platform, ngZone: NgZone) {\n    ngZone.runOutsideAngular(() => {\n      this._change = _platform.isBrowser ?\n          merge(fromEvent(window, 'resize'), fromEvent(window, 'orientationchange')) :\n          observableOf();\n\n      // Note that we need to do the subscription inside `runOutsideAngular`\n      // since subscribing is what causes the event listener to be added.\n      this._invalidateCache = this.change().subscribe(() => this._updateViewportSize());\n    });\n  }\n\n  ngOnDestroy() {\n    this._invalidateCache.unsubscribe();\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 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   * @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  /** Updates the cached viewport size. */\n  private _updateViewportSize() {\n    this._viewportSize = this._platform.isBrowser ?\n        {width: window.innerWidth, height: window.innerHeight} :\n        {width: 0, height: 0};\n  }\n}\n"]}