@angular/cdk
Version:
Angular Material Component Development Kit
131 lines • 19 kB
JavaScript
/**
* @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 { merge, of as observableOf, fromEvent } 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,
/** @breaking-change 11.0.0 make document required */
document) {
this._platform = _platform;
this._document = document;
ngZone.runOutsideAngular(() => {
const window = this._getWindow();
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(() => this._updateViewportSize());
});
}
ngOnDestroy() {
this._invalidateCache.unsubscribe();
}
/** 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._getDocument();
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.
* @param throttleTime Time in milliseconds to throttle the stream.
*/
change(throttleTime = DEFAULT_RESIZE_TIME) {
return throttleTime > 0 ? this._change.pipe(auditTime(throttleTime)) : this._change;
}
/** Access injected document if available or fallback to global document reference */
_getDocument() {
return this._document || document;
}
/** Use defaultView of injected document if available or fallback to global window reference */
_getWindow() {
const doc = this._getDocument();
return doc.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};\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  /** Used to reference correct document/window */\n  protected _document?: Document;\n\n  constructor(private _platform: Platform,\n              ngZone: NgZone,\n              /** @breaking-change 11.0.0 make document required */\n              @Optional() @Inject(DOCUMENT) document?: any) {\n    this._document = document;\n\n    ngZone.runOutsideAngular(() => {\n      const window = this._getWindow();\n\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 document = this._getDocument();\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   * @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  /** Access injected document if available or fallback to global document reference */\n  private _getDocument(): Document {\n    return this._document || document;\n  }\n\n  /** Use defaultView of injected document if available or fallback to global window reference */\n  private _getWindow(): Window {\n    const doc = this._getDocument();\n    return doc.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"]}