@angular/cdk
Version:
Angular Material Component Development Kit
147 lines • 20.7 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 { 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";
/** 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
*/
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 };
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: ViewportRuler, deps: [{ token: i1.Platform }, { token: i0.NgZone }, { token: DOCUMENT, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: ViewportRuler, providedIn: 'root' }); }
}
export { ViewportRuler };
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: ViewportRuler, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.Platform }, { type: i0.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(\n    private _platform: Platform,\n    ngZone: NgZone,\n    @Optional() @Inject(DOCUMENT) document: any,\n  ) {\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() {\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 =\n      -documentRect.top ||\n      document.body.scrollTop ||\n      window.scrollY ||\n      documentElement.scrollTop ||\n      0;\n\n    const left =\n      -documentRect.left ||\n      document.body.scrollLeft ||\n      window.scrollX ||\n      documentElement.scrollLeft ||\n      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"]}