@angular/cdk
Version:
Angular Material Component Development Kit
91 lines • 13.7 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 { DOCUMENT } from '@angular/common';
import { Inject, Injectable } from '@angular/core';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/platform";
import * as i2 from "@angular/common";
/** CSS class applied to the document body when in black-on-white high-contrast mode. */
export const BLACK_ON_WHITE_CSS_CLASS = 'cdk-high-contrast-black-on-white';
/** CSS class applied to the document body when in white-on-black high-contrast mode. */
export const WHITE_ON_BLACK_CSS_CLASS = 'cdk-high-contrast-white-on-black';
/** CSS class applied to the document body when in high-contrast mode. */
export const HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS = 'cdk-high-contrast-active';
/**
* Service to determine whether the browser is currently in a high-contrast-mode environment.
*
* Microsoft Windows supports an accessibility feature called "High Contrast Mode". This mode
* changes the appearance of all applications, including web applications, to dramatically increase
* contrast.
*
* IE, Edge, and Firefox currently support this mode. Chrome does not support Windows High Contrast
* Mode. This service does not detect high-contrast mode as added by the Chrome "High Contrast"
* browser extension.
*/
export class HighContrastModeDetector {
constructor(_platform, document) {
this._platform = _platform;
this._document = document;
}
/** Gets the current high-contrast-mode for the page. */
getHighContrastMode() {
if (!this._platform.isBrowser) {
return 0 /* NONE */;
}
// Create a test element with an arbitrary background-color that is neither black nor
// white; high-contrast mode will coerce the color to either black or white. Also ensure that
// appending the test element to the DOM does not affect layout by absolutely positioning it
const testElement = this._document.createElement('div');
testElement.style.backgroundColor = 'rgb(1,2,3)';
testElement.style.position = 'absolute';
this._document.body.appendChild(testElement);
// Get the computed style for the background color, collapsing spaces to normalize between
// browsers. Once we get this color, we no longer need the test element. Access the `window`
// via the document so we can fake it in tests. Note that we have extra null checks, because
// this logic will likely run during app bootstrap and throwing can break the entire app.
const documentWindow = this._document.defaultView || window;
const computedStyle = (documentWindow && documentWindow.getComputedStyle) ?
documentWindow.getComputedStyle(testElement) : null;
const computedColor = (computedStyle && computedStyle.backgroundColor || '').replace(/ /g, '');
this._document.body.removeChild(testElement);
switch (computedColor) {
case 'rgb(0,0,0)': return 2 /* WHITE_ON_BLACK */;
case 'rgb(255,255,255)': return 1 /* BLACK_ON_WHITE */;
}
return 0 /* NONE */;
}
/** Applies CSS classes indicating high-contrast mode to document body (browser-only). */
_applyBodyHighContrastModeCssClasses() {
if (this._platform.isBrowser && this._document.body) {
const bodyClasses = this._document.body.classList;
// IE11 doesn't support `classList` operations with multiple arguments
bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
bodyClasses.remove(BLACK_ON_WHITE_CSS_CLASS);
bodyClasses.remove(WHITE_ON_BLACK_CSS_CLASS);
const mode = this.getHighContrastMode();
if (mode === 1 /* BLACK_ON_WHITE */) {
bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
bodyClasses.add(BLACK_ON_WHITE_CSS_CLASS);
}
else if (mode === 2 /* WHITE_ON_BLACK */) {
bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
bodyClasses.add(WHITE_ON_BLACK_CSS_CLASS);
}
}
}
}
HighContrastModeDetector.ɵprov = i0.ɵɵdefineInjectable({ factory: function HighContrastModeDetector_Factory() { return new HighContrastModeDetector(i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i2.DOCUMENT)); }, token: HighContrastModeDetector, providedIn: "root" });
HighContrastModeDetector.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
HighContrastModeDetector.ctorParameters = () => [
{ type: Platform },
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
];
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This mode\n * changes the appearance of all applications, including web applications, to dramatically increase\n * contrast.\n *\n * IE, Edge, and Firefox currently support this mode. Chrome does not support Windows High Contrast\n * Mode. This service does not detect high-contrast mode as added by the Chrome \"High Contrast\"\n * browser extension.\n */\n@Injectable({providedIn: 'root'})\nexport class HighContrastModeDetector {\n  private _document: Document;\n\n  constructor(private _platform: Platform, @Inject(DOCUMENT) document: any) {\n    this._document = document;\n  }\n\n  /** Gets the current high-contrast-mode for the page. */\n  getHighContrastMode(): HighContrastMode {\n    if (!this._platform.isBrowser) {\n      return HighContrastMode.NONE;\n    }\n\n    // Create a test element with an arbitrary background-color that is neither black nor\n    // white; high-contrast mode will coerce the color to either black or white. Also ensure that\n    // appending the test element to the DOM does not affect layout by absolutely positioning it\n    const testElement = this._document.createElement('div');\n    testElement.style.backgroundColor = 'rgb(1,2,3)';\n    testElement.style.position = 'absolute';\n    this._document.body.appendChild(testElement);\n\n    // Get the computed style for the background color, collapsing spaces to normalize between\n    // browsers. Once we get this color, we no longer need the test element. Access the `window`\n    // via the document so we can fake it in tests. Note that we have extra null checks, because\n    // this logic will likely run during app bootstrap and throwing can break the entire app.\n    const documentWindow = this._document.defaultView || window;\n    const computedStyle = (documentWindow && documentWindow.getComputedStyle) ?\n        documentWindow.getComputedStyle(testElement) : null;\n    const computedColor =\n        (computedStyle && computedStyle.backgroundColor || '').replace(/ /g, '');\n    this._document.body.removeChild(testElement);\n\n    switch (computedColor) {\n      case 'rgb(0,0,0)': return HighContrastMode.WHITE_ON_BLACK;\n      case 'rgb(255,255,255)': return HighContrastMode.BLACK_ON_WHITE;\n    }\n    return HighContrastMode.NONE;\n  }\n\n  /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */\n  _applyBodyHighContrastModeCssClasses(): void {\n    if (this._platform.isBrowser && this._document.body) {\n      const bodyClasses = this._document.body.classList;\n      // IE11 doesn't support `classList` operations with multiple arguments\n      bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n      bodyClasses.remove(BLACK_ON_WHITE_CSS_CLASS);\n      bodyClasses.remove(WHITE_ON_BLACK_CSS_CLASS);\n\n      const mode = this.getHighContrastMode();\n      if (mode === HighContrastMode.BLACK_ON_WHITE) {\n        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n        bodyClasses.add(BLACK_ON_WHITE_CSS_CLASS);\n      } else if (mode === HighContrastMode.WHITE_ON_BLACK) {\n        bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);\n        bodyClasses.add(WHITE_ON_BLACK_CSS_CLASS);\n      }\n    }\n  }\n}\n"]}