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 { ALT, CONTROL, MAC_META, META, SHIFT } from '@angular/cdk/keycodes';
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9 | import { Inject, Injectable, InjectionToken, Optional, NgZone } from '@angular/core';
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10 | import { normalizePassiveListenerOptions, Platform, _getEventTarget } from '@angular/cdk/platform';
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11 | import { DOCUMENT } from '@angular/common';
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12 | import { BehaviorSubject } from 'rxjs';
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13 | import { distinctUntilChanged, skip } from 'rxjs/operators';
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14 | import { isFakeMousedownFromScreenReader, isFakeTouchstartFromScreenReader, } from '../fake-event-detection';
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15 | import * as i0 from "@angular/core";
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16 | import * as i1 from "@angular/cdk/platform";
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17 | import * as i2 from "@angular/common";
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18 | /**
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19 | * Injectable options for the InputModalityDetector. These are shallowly merged with the default
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20 | * options.
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21 | */
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22 | export const INPUT_MODALITY_DETECTOR_OPTIONS = new InjectionToken('cdk-input-modality-detector-options');
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23 | /**
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24 | * Default options for the InputModalityDetector.
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25 | *
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26 | * Modifier keys are ignored by default (i.e. when pressed won't cause the service to detect
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27 | * keyboard input modality) for two reasons:
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28 | *
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29 | * 1. Modifier keys are commonly used with mouse to perform actions such as 'right click' or 'open
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30 | * in new tab', and are thus less representative of actual keyboard interaction.
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31 | * 2. VoiceOver triggers some keyboard events when linearly navigating with Control + Option (but
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32 | * confusingly not with Caps Lock). Thus, to have parity with other screen readers, we ignore
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33 | * these keys so as to not update the input modality.
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34 | *
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35 | * Note that we do not by default ignore the right Meta key on Safari because it has the same key
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36 | * code as the ContextMenu key on other browsers. When we switch to using event.key, we can
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37 | * distinguish between the two.
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38 | */
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39 | export const INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS = {
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40 | ignoreKeys: [ALT, CONTROL, MAC_META, META, SHIFT],
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41 | };
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42 | /**
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43 | * The amount of time needed to pass after a touchstart event in order for a subsequent mousedown
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44 | * event to be attributed as mouse and not touch.
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45 | *
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46 | * This is the value used by AngularJS Material. Through trial and error (on iPhone 6S) they found
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47 | * that a value of around 650ms seems appropriate.
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48 | */
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49 | export const TOUCH_BUFFER_MS = 650;
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50 | /**
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51 | * Event listener options that enable capturing and also mark the listener as passive if the browser
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52 | * supports it.
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53 | */
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54 | const modalityEventListenerOptions = normalizePassiveListenerOptions({
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55 | passive: true,
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56 | capture: true,
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57 | });
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58 | /**
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59 | * Service that detects the user's input modality.
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60 | *
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61 | * This service does not update the input modality when a user navigates with a screen reader
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62 | * (e.g. linear navigation with VoiceOver, object navigation / browse mode with NVDA, virtual PC
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63 | * cursor mode with JAWS). This is in part due to technical limitations (i.e. keyboard events do not
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64 | * fire as expected in these modes) but is also arguably the correct behavior. Navigating with a
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65 | * screen reader is akin to visually scanning a page, and should not be interpreted as actual user
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66 | * input interaction.
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67 | *
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68 | * When a user is not navigating but *interacting* with a screen reader, this service attempts to
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69 | * update the input modality to keyboard, but in general this service's behavior is largely
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70 | * undefined.
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71 | */
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72 | export class InputModalityDetector {
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73 | constructor(_platform, ngZone, document, options) {
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74 | this._platform = _platform;
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75 | /**
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76 | * The most recently detected input modality event target. Is null if no input modality has been
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77 | * detected or if the associated event target is null for some unknown reason.
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78 | */
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79 | this._mostRecentTarget = null;
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80 | /** The underlying BehaviorSubject that emits whenever an input modality is detected. */
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81 | this._modality = new BehaviorSubject(null);
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82 | /**
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83 | * The timestamp of the last touch input modality. Used to determine whether mousedown events
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84 | * should be attributed to mouse or touch.
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85 | */
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86 | this._lastTouchMs = 0;
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87 | /**
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88 | * Handles keydown events. Must be an arrow function in order to preserve the context when it gets
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89 | * bound.
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90 | */
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91 | this._onKeydown = (event) => {
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92 | var _a, _b;
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93 | // If this is one of the keys we should ignore, then ignore it and don't update the input
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94 | // modality to keyboard.
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95 | if ((_b = (_a = this._options) === null || _a === void 0 ? void 0 : _a.ignoreKeys) === null || _b === void 0 ? void 0 : _b.some(keyCode => keyCode === event.keyCode)) {
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96 | return;
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97 | }
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98 | this._modality.next('keyboard');
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99 | this._mostRecentTarget = _getEventTarget(event);
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100 | };
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101 | /**
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102 | * Handles mousedown events. Must be an arrow function in order to preserve the context when it
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103 | * gets bound.
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104 | */
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105 | this._onMousedown = (event) => {
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106 | // Touches trigger both touch and mouse events, so we need to distinguish between mouse events
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107 | // that were triggered via mouse vs touch. To do so, check if the mouse event occurs closely
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108 | // after the previous touch event.
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109 | if (Date.now() - this._lastTouchMs < TOUCH_BUFFER_MS) {
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110 | return;
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111 | }
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112 | // Fake mousedown events are fired by some screen readers when controls are activated by the
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113 | // screen reader. Attribute them to keyboard input modality.
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114 | this._modality.next(isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse');
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115 | this._mostRecentTarget = _getEventTarget(event);
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116 | };
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117 | /**
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118 | * Handles touchstart events. Must be an arrow function in order to preserve the context when it
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119 | * gets bound.
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120 | */
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121 | this._onTouchstart = (event) => {
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122 | // Same scenario as mentioned in _onMousedown, but on touch screen devices, fake touchstart
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123 | // events are fired. Again, attribute to keyboard input modality.
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124 | if (isFakeTouchstartFromScreenReader(event)) {
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125 | this._modality.next('keyboard');
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126 | return;
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127 | }
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128 | // Store the timestamp of this touch event, as it's used to distinguish between mouse events
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129 | // triggered via mouse vs touch.
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130 | this._lastTouchMs = Date.now();
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131 | this._modality.next('touch');
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132 | this._mostRecentTarget = _getEventTarget(event);
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133 | };
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134 | this._options = Object.assign(Object.assign({}, INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS), options);
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135 | // Skip the first emission as it's null.
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136 | this.modalityDetected = this._modality.pipe(skip(1));
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137 | this.modalityChanged = this.modalityDetected.pipe(distinctUntilChanged());
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138 | // If we're not in a browser, this service should do nothing, as there's no relevant input
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139 | // modality to detect.
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140 | if (_platform.isBrowser) {
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141 | ngZone.runOutsideAngular(() => {
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142 | document.addEventListener('keydown', this._onKeydown, modalityEventListenerOptions);
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143 | document.addEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);
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144 | document.addEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);
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145 | });
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146 | }
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147 | }
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148 | /** The most recently detected input modality. */
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149 | get mostRecentModality() {
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150 | return this._modality.value;
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151 | }
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152 | ngOnDestroy() {
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153 | this._modality.complete();
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154 | if (this._platform.isBrowser) {
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155 | document.removeEventListener('keydown', this._onKeydown, modalityEventListenerOptions);
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156 | document.removeEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);
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157 | document.removeEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);
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158 | }
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159 | }
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160 | }
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161 | InputModalityDetector.ɵprov = i0.ɵɵdefineInjectable({ factory: function InputModalityDetector_Factory() { return new InputModalityDetector(i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i2.DOCUMENT), i0.ɵɵinject(INPUT_MODALITY_DETECTOR_OPTIONS, 8)); }, token: InputModalityDetector, providedIn: "root" });
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162 | InputModalityDetector.decorators = [
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163 | { type: Injectable, args: [{ providedIn: 'root' },] }
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164 | ];
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165 | InputModalityDetector.ctorParameters = () => [
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166 | { type: Platform },
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167 | { type: NgZone },
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168 | { type: Document, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
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169 | { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [INPUT_MODALITY_DETECTOR_OPTIONS,] }] }
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170 | ];
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Null is used if the input modality is unknown.\n */\nexport type InputModality = 'keyboard' | 'mouse' | 'touch' | null;\n\n/** Options to configure the behavior of the InputModalityDetector. */\nexport interface InputModalityDetectorOptions {\n  /** Keys to ignore when detecting keyboard input modality. */\n  ignoreKeys?: number[];\n}\n\n/**\n * Injectable options for the InputModalityDetector. These are shallowly merged with the default\n * options.\n */\nexport const INPUT_MODALITY_DETECTOR_OPTIONS =\n  new InjectionToken<InputModalityDetectorOptions>('cdk-input-modality-detector-options');\n\n/**\n * Default options for the InputModalityDetector.\n *\n * Modifier keys are ignored by default (i.e. when pressed won't cause the service to detect\n * keyboard input modality) for two reasons:\n *\n * 1. Modifier keys are commonly used with mouse to perform actions such as 'right click' or 'open\n *    in new tab', and are thus less representative of actual keyboard interaction.\n * 2. VoiceOver triggers some keyboard events when linearly navigating with Control + Option (but\n *    confusingly not with Caps Lock). Thus, to have parity with other screen readers, we ignore\n *    these keys so as to not update the input modality.\n *\n * Note that we do not by default ignore the right Meta key on Safari because it has the same key\n * code as the ContextMenu key on other browsers. When we switch to using event.key, we can\n * distinguish between the two.\n */\nexport const INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS: InputModalityDetectorOptions = {\n  ignoreKeys: [ALT, CONTROL, MAC_META, META, SHIFT],\n};\n\n/**\n * The amount of time needed to pass after a touchstart event in order for a subsequent mousedown\n * event to be attributed as mouse and not touch.\n *\n * This is the value used by AngularJS Material. Through trial and error (on iPhone 6S) they found\n * that a value of around 650ms seems appropriate.\n */\nexport const TOUCH_BUFFER_MS = 650;\n\n/**\n * Event listener options that enable capturing and also mark the listener as passive if the browser\n * supports it.\n */\nconst modalityEventListenerOptions = normalizePassiveListenerOptions({\n  passive: true,\n  capture: true,\n});\n\n/**\n * Service that detects the user's input modality.\n *\n * This service does not update the input modality when a user navigates with a screen reader\n * (e.g. linear navigation with VoiceOver, object navigation / browse mode with NVDA, virtual PC\n * cursor mode with JAWS). This is in part due to technical limitations (i.e. keyboard events do not\n * fire as expected in these modes) but is also arguably the correct behavior. Navigating with a\n * screen reader is akin to visually scanning a page, and should not be interpreted as actual user\n * input interaction.\n *\n * When a user is not navigating but *interacting* with a screen reader, this service attempts to\n * update the input modality to keyboard, but in general this service's behavior is largely\n * undefined.\n */\n@Injectable({providedIn: 'root'})\nexport class InputModalityDetector implements OnDestroy {\n  /** Emits whenever an input modality is detected. */\n  readonly modalityDetected: Observable<InputModality>;\n\n  /** Emits when the input modality changes. */\n  readonly modalityChanged: Observable<InputModality>;\n\n  /** The most recently detected input modality. */\n  get mostRecentModality(): InputModality {\n    return this._modality.value;\n  }\n\n  /**\n   * The most recently detected input modality event target. Is null if no input modality has been\n   * detected or if the associated event target is null for some unknown reason.\n   */\n  _mostRecentTarget: HTMLElement | null = null;\n\n  /** The underlying BehaviorSubject that emits whenever an input modality is detected. */\n  private readonly _modality = new BehaviorSubject<InputModality>(null);\n\n  /** Options for this InputModalityDetector. */\n  private readonly _options: InputModalityDetectorOptions;\n\n  /**\n   * The timestamp of the last touch input modality. Used to determine whether mousedown events\n   * should be attributed to mouse or touch.\n   */\n  private _lastTouchMs = 0;\n\n  /**\n   * Handles keydown events. Must be an arrow function in order to preserve the context when it gets\n   * bound.\n   */\n  private _onKeydown = (event: KeyboardEvent) => {\n    // If this is one of the keys we should ignore, then ignore it and don't update the input\n    // modality to keyboard.\n    if (this._options?.ignoreKeys?.some(keyCode => keyCode === event.keyCode)) { return; }\n\n    this._modality.next('keyboard');\n    this._mostRecentTarget = _getEventTarget(event);\n  }\n\n  /**\n   * Handles mousedown events. Must be an arrow function in order to preserve the context when it\n   * gets bound.\n   */\n  private _onMousedown = (event: MouseEvent) => {\n    // Touches trigger both touch and mouse events, so we need to distinguish between mouse events\n    // that were triggered via mouse vs touch. To do so, check if the mouse event occurs closely\n    // after the previous touch event.\n    if (Date.now() - this._lastTouchMs < TOUCH_BUFFER_MS) { return; }\n\n    // Fake mousedown events are fired by some screen readers when controls are activated by the\n    // screen reader. Attribute them to keyboard input modality.\n    this._modality.next(isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse');\n    this._mostRecentTarget = _getEventTarget(event);\n  }\n\n  /**\n   * Handles touchstart events. Must be an arrow function in order to preserve the context when it\n   * gets bound.\n   */\n  private _onTouchstart = (event: TouchEvent) => {\n    // Same scenario as mentioned in _onMousedown, but on touch screen devices, fake touchstart\n    // events are fired. Again, attribute to keyboard input modality.\n    if (isFakeTouchstartFromScreenReader(event)) {\n      this._modality.next('keyboard');\n      return;\n    }\n\n    // Store the timestamp of this touch event, as it's used to distinguish between mouse events\n    // triggered via mouse vs touch.\n    this._lastTouchMs = Date.now();\n\n    this._modality.next('touch');\n    this._mostRecentTarget = _getEventTarget(event);\n  }\n\n  constructor(\n      private readonly _platform: Platform,\n      ngZone: NgZone,\n      @Inject(DOCUMENT) document: Document,\n      @Optional() @Inject(INPUT_MODALITY_DETECTOR_OPTIONS)\n      options?: InputModalityDetectorOptions,\n  ) {\n    this._options = {\n      ...INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS,\n      ...options,\n    };\n\n    // Skip the first emission as it's null.\n    this.modalityDetected = this._modality.pipe(skip(1));\n    this.modalityChanged = this.modalityDetected.pipe(distinctUntilChanged());\n\n    // If we're not in a browser, this service should do nothing, as there's no relevant input\n    // modality to detect.\n    if (_platform.isBrowser) {\n      ngZone.runOutsideAngular(() => {\n        document.addEventListener('keydown', this._onKeydown, modalityEventListenerOptions);\n        document.addEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);\n        document.addEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);\n      });\n    }\n  }\n\n  ngOnDestroy() {\n    this._modality.complete();\n\n    if (this._platform.isBrowser) {\n      document.removeEventListener('keydown', this._onKeydown, modalityEventListenerOptions);\n      document.removeEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);\n      document.removeEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);\n    }\n  }\n}\n"]} |
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