1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import { Platform } from '@angular/cdk/platform';
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9 | import { DOCUMENT } from '@angular/common';
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10 | import { Inject, Injectable } from '@angular/core';
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11 | import * as i0 from "@angular/core";
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12 | import * as i1 from "@angular/cdk/platform";
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13 | import * as i2 from "@angular/common";
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14 | /** CSS class applied to the document body when in black-on-white high-contrast mode. */
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15 | export const BLACK_ON_WHITE_CSS_CLASS = 'cdk-high-contrast-black-on-white';
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16 | /** CSS class applied to the document body when in white-on-black high-contrast mode. */
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17 | export const WHITE_ON_BLACK_CSS_CLASS = 'cdk-high-contrast-white-on-black';
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18 | /** CSS class applied to the document body when in high-contrast mode. */
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19 | export const HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS = 'cdk-high-contrast-active';
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20 | /**
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21 | * Service to determine whether the browser is currently in a high-contrast-mode environment.
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22 | *
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23 | * Microsoft Windows supports an accessibility feature called "High Contrast Mode". This mode
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24 | * changes the appearance of all applications, including web applications, to dramatically increase
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25 | * contrast.
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26 | *
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27 | * IE, Edge, and Firefox currently support this mode. Chrome does not support Windows High Contrast
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28 | * Mode. This service does not detect high-contrast mode as added by the Chrome "High Contrast"
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29 | * browser extension.
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30 | */
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31 | export class HighContrastModeDetector {
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32 | constructor(_platform, document) {
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33 | this._platform = _platform;
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34 | this._document = document;
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35 | }
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36 | /** Gets the current high-contrast-mode for the page. */
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37 | getHighContrastMode() {
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38 | if (!this._platform.isBrowser) {
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39 | return 0 /* NONE */;
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40 | }
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41 | // Create a test element with an arbitrary background-color that is neither black nor
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42 | // white; high-contrast mode will coerce the color to either black or white. Also ensure that
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43 | // appending the test element to the DOM does not affect layout by absolutely positioning it
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44 | const testElement = this._document.createElement('div');
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45 | testElement.style.backgroundColor = 'rgb(1,2,3)';
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46 | testElement.style.position = 'absolute';
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47 | this._document.body.appendChild(testElement);
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48 | // Get the computed style for the background color, collapsing spaces to normalize between
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49 | // browsers. Once we get this color, we no longer need the test element. Access the `window`
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50 | // via the document so we can fake it in tests. Note that we have extra null checks, because
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51 | // this logic will likely run during app bootstrap and throwing can break the entire app.
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52 | const documentWindow = this._document.defaultView || window;
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53 | const computedStyle = (documentWindow && documentWindow.getComputedStyle) ?
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54 | documentWindow.getComputedStyle(testElement) : null;
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55 | const computedColor = (computedStyle && computedStyle.backgroundColor || '').replace(/ /g, '');
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56 | this._document.body.removeChild(testElement);
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57 | switch (computedColor) {
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58 | case 'rgb(0,0,0)': return 2 /* WHITE_ON_BLACK */;
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59 | case 'rgb(255,255,255)': return 1 /* BLACK_ON_WHITE */;
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60 | }
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61 | return 0 /* NONE */;
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62 | }
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63 | /** Applies CSS classes indicating high-contrast mode to document body (browser-only). */
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64 | _applyBodyHighContrastModeCssClasses() {
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65 | if (!this._hasCheckedHighContrastMode && this._platform.isBrowser && this._document.body) {
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66 | const bodyClasses = this._document.body.classList;
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67 | // IE11 doesn't support `classList` operations with multiple arguments
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68 | bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
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69 | bodyClasses.remove(BLACK_ON_WHITE_CSS_CLASS);
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70 | bodyClasses.remove(WHITE_ON_BLACK_CSS_CLASS);
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71 | this._hasCheckedHighContrastMode = true;
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72 | const mode = this.getHighContrastMode();
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73 | if (mode === 1 /* BLACK_ON_WHITE */) {
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74 | bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
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75 | bodyClasses.add(BLACK_ON_WHITE_CSS_CLASS);
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76 | }
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77 | else if (mode === 2 /* WHITE_ON_BLACK */) {
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78 | bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS);
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79 | bodyClasses.add(WHITE_ON_BLACK_CSS_CLASS);
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80 | }
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81 | }
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82 | }
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83 | }
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84 | HighContrastModeDetector.ɵprov = i0.ɵɵdefineInjectable({ factory: function HighContrastModeDetector_Factory() { return new HighContrastModeDetector(i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i2.DOCUMENT)); }, token: HighContrastModeDetector, providedIn: "root" });
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85 | HighContrastModeDetector.decorators = [
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86 | { type: Injectable, args: [{ providedIn: 'root' },] }
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87 | ];
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88 | HighContrastModeDetector.ctorParameters = () => [
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89 | { type: Platform },
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90 | { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
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91 | ];
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92 | //# sourceMappingURL=data:application/json;base64,{"version":3,"file":"high-contrast-mode-detector.js","sourceRoot":"","sources":["../../../../../../../src/cdk/a11y/high-contrast-mode/high-contrast-mode-detector.ts"],"names":[],"mappings":"AAAA;;;;;;GAMG;AAEH,OAAO,EAAC,QAAQ,EAAC,MAAM,uBAAuB,CAAC;AAC/C,OAAO,EAAC,QAAQ,EAAC,MAAM,iBAAiB,CAAC;AACzC,OAAO,EAAC,MAAM,EAAE,UAAU,EAAC,MAAM,eAAe,CAAC;;;;AAUjD,wFAAwF;AACxF,MAAM,CAAC,MAAM,wBAAwB,GAAG,kCAAkC,CAAC;AAE3E,wFAAwF;AACxF,MAAM,CAAC,MAAM,wBAAwB,GAAG,kCAAkC,CAAC;AAE3E,yEAAyE;AACzE,MAAM,CAAC,MAAM,mCAAmC,GAAG,0BAA0B,CAAC;AAE9E;;;;;;;;;;GAUG;AAEH,MAAM,OAAO,wBAAwB;IAQnC,YAAoB,SAAmB,EAAoB,QAAa;QAApD,cAAS,GAAT,SAAS,CAAU;QACrC,IAAI,CAAC,SAAS,GAAG,QAAQ,CAAC;IAC5B,CAAC;IAED,wDAAwD;IACxD,mBAAmB;QACjB,IAAI,CAAC,IAAI,CAAC,SAAS,CAAC,SAAS,EAAE;YAC7B,oBAA6B;SAC9B;QAED,qFAAqF;QACrF,6FAA6F;QAC7F,4FAA4F;QAC5F,MAAM,WAAW,GAAG,IAAI,CAAC,SAAS,CAAC,aAAa,CAAC,KAAK,CAAC,CAAC;QACxD,WAAW,CAAC,KAAK,CAAC,eAAe,GAAG,YAAY,CAAC;QACjD,WAAW,CAAC,KAAK,CAAC,QAAQ,GAAG,UAAU,CAAC;QACxC,IAAI,CAAC,SAAS,CAAC,IAAI,CAAC,WAAW,CAAC,WAAW,CAAC,CAAC;QAE7C,0FAA0F;QAC1F,4FAA4F;QAC5F,4FAA4F;QAC5F,yFAAyF;QACzF,MAAM,cAAc,GAAG,IAAI,CAAC,SAAS,CAAC,WAAW,IAAI,MAAM,CAAC;QAC5D,MAAM,aAAa,GAAG,CAAC,cAAc,IAAI,cAAc,CAAC,gBAAgB,CAAC,CAAC,CAAC;YACvE,cAAc,CAAC,gBAAgB,CAAC,WAAW,CAAC,CAAC,CAAC,CAAC,IAAI,CAAC;QACxD,MAAM,aAAa,GACf,CAAC,aAAa,IAAI,aAAa,CAAC,eAAe,IAAI,EAAE,CAAC,CAAC,OAAO,CAAC,IAAI,EAAE,EAAE,CAAC,CAAC;QAC7E,IAAI,CAAC,SAAS,CAAC,IAAI,CAAC,WAAW,CAAC,WAAW,CAAC,CAAC;QAE7C,QAAQ,aAAa,EAAE;YACrB,KAAK,YAAY,CAAC,CAAC,8BAAuC;YAC1D,KAAK,kBAAkB,CAAC,CAAC,8BAAuC;SACjE;QACD,oBAA6B;IAC/B,CAAC;IAED,yFAAyF;IACzF,oCAAoC;QAClC,IAAI,CAAC,IAAI,CAAC,2BAA2B,IAAI,IAAI,CAAC,SAAS,CAAC,SAAS,IAAI,IAAI,CAAC,SAAS,CAAC,IAAI,EAAE;YACxF,MAAM,WAAW,GAAG,IAAI,CAAC,SAAS,CAAC,IAAI,CAAC,SAAS,CAAC;YAClD,sEAAsE;YACtE,WAAW,CAAC,MAAM,CAAC,mCAAmC,CAAC,CAAC;YACxD,WAAW,CAAC,MAAM,CAAC,wBAAwB,CAAC,CAAC;YAC7C,WAAW,CAAC,MAAM,CAAC,wBAAwB,CAAC,CAAC;YAC7C,IAAI,CAAC,2BAA2B,GAAG,IAAI,CAAC;YAExC,MAAM,IAAI,GAAG,IAAI,CAAC,mBAAmB,EAAE,CAAC;YACxC,IAAI,IAAI,2BAAoC,EAAE;gBAC5C,WAAW,CAAC,GAAG,CAAC,mCAAmC,CAAC,CAAC;gBACrD,WAAW,CAAC,GAAG,CAAC,wBAAwB,CAAC,CAAC;aAC3C;iBAAM,IAAI,IAAI,2BAAoC,EAAE;gBACnD,WAAW,CAAC,GAAG,CAAC,mCAAmC,CAAC,CAAC;gBACrD,WAAW,CAAC,GAAG,CAAC,wBAAwB,CAAC,CAAC;aAC3C;SACF;IACH,CAAC;;;;YAhEF,UAAU,SAAC,EAAC,UAAU,EAAE,MAAM,EAAC;;;YAhCxB,QAAQ;4CAyC4B,MAAM,SAAC,QAAQ","sourcesContent":["/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Platform} from '@angular/cdk/platform';\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable} from '@angular/core';\n\n\n/** Set of possible high-contrast mode backgrounds. */\nexport const enum HighContrastMode {\n  NONE,\n  BLACK_ON_WHITE,\n  WHITE_ON_BLACK,\n}\n\n/** CSS class applied to the document body when in black-on-white high-contrast mode. */\nexport const BLACK_ON_WHITE_CSS_CLASS = 'cdk-high-contrast-black-on-white';\n\n/** CSS class applied to the document body when in white-on-black high-contrast mode. */\nexport const WHITE_ON_BLACK_CSS_CLASS = 'cdk-high-contrast-white-on-black';\n\n/** CSS class applied to the document body when in high-contrast mode. */\nexport const HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS = 'cdk-high-contrast-active';\n\n/**\n * Service to determine whether the browser is currently in a high-contrast-mode environment.\n *\n * Microsoft Windows supports an accessibility feature called \"High Contrast Mode\". 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  /**\n   * Figuring out the high contrast mode and adding the body classes can cause\n   * some expensive layouts. This flag is used to ensure that we only do it once.\n   */\n  private _hasCheckedHighContrastMode: boolean;\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._hasCheckedHighContrastMode && 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      this._hasCheckedHighContrastMode = true;\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"]} |
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