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, normalizePassiveListenerOptions, _getShadowRoot, _getEventTarget, } from '@angular/cdk/platform';
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9 | import { Directive, ElementRef, EventEmitter, Inject, Injectable, InjectionToken, NgZone, Optional, Output, } from '@angular/core';
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10 | import { of as observableOf, Subject } from 'rxjs';
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11 | import { takeUntil } from 'rxjs/operators';
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12 | import { coerceElement } from '@angular/cdk/coercion';
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13 | import { DOCUMENT } from '@angular/common';
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14 | import { InputModalityDetector, TOUCH_BUFFER_MS, } from '../input-modality/input-modality-detector';
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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 "../input-modality/input-modality-detector";
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18 | import * as i3 from "@angular/common";
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19 | /** InjectionToken for FocusMonitorOptions. */
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20 | export const FOCUS_MONITOR_DEFAULT_OPTIONS = new InjectionToken('cdk-focus-monitor-default-options');
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21 | /**
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22 | * Event listener options that enable capturing and also
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23 | * mark the listener as passive if the browser supports it.
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24 | */
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25 | const captureEventListenerOptions = normalizePassiveListenerOptions({
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26 | passive: true,
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27 | capture: true
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28 | });
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29 | /** Monitors mouse and keyboard events to determine the cause of focus events. */
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30 | export class FocusMonitor {
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31 | constructor(_ngZone, _platform, _inputModalityDetector,
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32 | /** @breaking-change 11.0.0 make document required */
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33 | document, options) {
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34 | this._ngZone = _ngZone;
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35 | this._platform = _platform;
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36 | this._inputModalityDetector = _inputModalityDetector;
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37 | /** The focus origin that the next focus event is a result of. */
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38 | this._origin = null;
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39 | /** Whether the window has just been focused. */
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40 | this._windowFocused = false;
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41 | /**
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42 | * Whether the origin was determined via a touch interaction. Necessary as properly attributing
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43 | * focus events to touch interactions requires special logic.
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44 | */
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45 | this._originFromTouchInteraction = false;
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46 | /** Map of elements being monitored to their info. */
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47 | this._elementInfo = new Map();
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48 | /** The number of elements currently being monitored. */
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49 | this._monitoredElementCount = 0;
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50 | /**
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51 | * Keeps track of the root nodes to which we've currently bound a focus/blur handler,
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52 | * as well as the number of monitored elements that they contain. We have to treat focus/blur
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53 | * handlers differently from the rest of the events, because the browser won't emit events
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54 | * to the document when focus moves inside of a shadow root.
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55 | */
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56 | this._rootNodeFocusListenerCount = new Map();
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57 | /**
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58 | * Event listener for `focus` events on the window.
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59 | * Needs to be an arrow function in order to preserve the context when it gets bound.
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60 | */
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61 | this._windowFocusListener = () => {
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62 | // Make a note of when the window regains focus, so we can
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63 | // restore the origin info for the focused element.
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64 | this._windowFocused = true;
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65 | this._windowFocusTimeoutId = setTimeout(() => this._windowFocused = false);
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66 | };
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67 | /** Subject for stopping our InputModalityDetector subscription. */
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68 | this._stopInputModalityDetector = new Subject();
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69 | /**
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70 | * Event listener for `focus` and 'blur' events on the document.
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71 | * Needs to be an arrow function in order to preserve the context when it gets bound.
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72 | */
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73 | this._rootNodeFocusAndBlurListener = (event) => {
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74 | const target = _getEventTarget(event);
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75 | const handler = event.type === 'focus' ? this._onFocus : this._onBlur;
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76 | // We need to walk up the ancestor chain in order to support `checkChildren`.
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77 | for (let element = target; element; element = element.parentElement) {
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78 | handler.call(this, event, element);
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79 | }
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80 | };
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81 | this._document = document;
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82 | this._detectionMode = (options === null || options === void 0 ? void 0 : options.detectionMode) || 0 /* IMMEDIATE */;
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83 | }
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84 | monitor(element, checkChildren = false) {
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85 | const nativeElement = coerceElement(element);
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86 | // Do nothing if we're not on the browser platform or the passed in node isn't an element.
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87 | if (!this._platform.isBrowser || nativeElement.nodeType !== 1) {
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88 | return observableOf(null);
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89 | }
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90 | // If the element is inside the shadow DOM, we need to bind our focus/blur listeners to
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91 | // the shadow root, rather than the `document`, because the browser won't emit focus events
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92 | // to the `document`, if focus is moving within the same shadow root.
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93 | const rootNode = _getShadowRoot(nativeElement) || this._getDocument();
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94 | const cachedInfo = this._elementInfo.get(nativeElement);
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95 | // Check if we're already monitoring this element.
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96 | if (cachedInfo) {
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97 | if (checkChildren) {
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98 | // TODO(COMP-318): this can be problematic, because it'll turn all non-checkChildren
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99 | // observers into ones that behave as if `checkChildren` was turned on. We need a more
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100 | // robust solution.
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101 | cachedInfo.checkChildren = true;
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102 | }
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103 | return cachedInfo.subject;
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104 | }
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105 | // Create monitored element info.
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106 | const info = {
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107 | checkChildren: checkChildren,
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108 | subject: new Subject(),
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109 | rootNode
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110 | };
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111 | this._elementInfo.set(nativeElement, info);
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112 | this._registerGlobalListeners(info);
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113 | return info.subject;
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114 | }
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115 | stopMonitoring(element) {
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116 | const nativeElement = coerceElement(element);
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117 | const elementInfo = this._elementInfo.get(nativeElement);
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118 | if (elementInfo) {
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119 | elementInfo.subject.complete();
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120 | this._setClasses(nativeElement);
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121 | this._elementInfo.delete(nativeElement);
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122 | this._removeGlobalListeners(elementInfo);
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123 | }
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124 | }
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125 | focusVia(element, origin, options) {
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126 | const nativeElement = coerceElement(element);
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127 | const focusedElement = this._getDocument().activeElement;
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128 | // If the element is focused already, calling `focus` again won't trigger the event listener
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129 | // which means that the focus classes won't be updated. If that's the case, update the classes
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130 | // directly without waiting for an event.
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131 | if (nativeElement === focusedElement) {
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132 | this._getClosestElementsInfo(nativeElement)
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133 | .forEach(([currentElement, info]) => this._originChanged(currentElement, origin, info));
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134 | }
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135 | else {
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136 | this._setOrigin(origin);
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137 | // `focus` isn't available on the server
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138 | if (typeof nativeElement.focus === 'function') {
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139 | nativeElement.focus(options);
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140 | }
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141 | }
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142 | }
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143 | ngOnDestroy() {
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144 | this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));
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145 | }
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146 | /** Access injected document if available or fallback to global document reference */
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147 | _getDocument() {
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148 | return this._document || document;
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149 | }
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150 | /** Use defaultView of injected document if available or fallback to global window reference */
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151 | _getWindow() {
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152 | const doc = this._getDocument();
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153 | return doc.defaultView || window;
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154 | }
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155 | _toggleClass(element, className, shouldSet) {
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156 | if (shouldSet) {
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157 | element.classList.add(className);
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158 | }
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159 | else {
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160 | element.classList.remove(className);
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161 | }
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162 | }
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163 | _getFocusOrigin(focusEventTarget) {
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164 | if (this._origin) {
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165 | // If the origin was realized via a touch interaction, we need to perform additional checks
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166 | // to determine whether the focus origin should be attributed to touch or program.
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167 | if (this._originFromTouchInteraction) {
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168 | return this._shouldBeAttributedToTouch(focusEventTarget) ? 'touch' : 'program';
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169 | }
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170 | else {
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171 | return this._origin;
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172 | }
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173 | }
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174 | // If the window has just regained focus, we can restore the most recent origin from before the
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175 | // window blurred. Otherwise, we've reached the point where we can't identify the source of the
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176 | // focus. This typically means one of two things happened:
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177 | //
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178 | // 1) The element was programmatically focused, or
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179 | // 2) The element was focused via screen reader navigation (which generally doesn't fire
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180 | // events).
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181 | //
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182 | // Because we can't distinguish between these two cases, we default to setting `program`.
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183 | return (this._windowFocused && this._lastFocusOrigin) ? this._lastFocusOrigin : 'program';
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184 | }
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185 | /**
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186 | * Returns whether the focus event should be attributed to touch. Recall that in IMMEDIATE mode, a
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187 | * touch origin isn't immediately reset at the next tick (see _setOrigin). This means that when we
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188 | * handle a focus event following a touch interaction, we need to determine whether (1) the focus
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189 | * event was directly caused by the touch interaction or (2) the focus event was caused by a
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190 | * subsequent programmatic focus call triggered by the touch interaction.
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191 | * @param focusEventTarget The target of the focus event under examination.
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192 | */
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193 | _shouldBeAttributedToTouch(focusEventTarget) {
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194 | // Please note that this check is not perfect. Consider the following edge case:
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195 | //
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196 | // <div #parent tabindex="0">
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197 | // <div #child tabindex="0" (click)="#parent.focus()"></div>
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198 | // </div>
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199 | //
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200 | // Suppose there is a FocusMonitor in IMMEDIATE mode attached to #parent. When the user touches
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201 | // #child, #parent is programmatically focused. This code will attribute the focus to touch
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202 | // instead of program. This is a relatively minor edge-case that can be worked around by using
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203 | // focusVia(parent, 'program') to focus #parent.
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204 | return (this._detectionMode === 1 /* EVENTUAL */) ||
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205 | !!(focusEventTarget === null || focusEventTarget === void 0 ? void 0 : focusEventTarget.contains(this._inputModalityDetector._mostRecentTarget));
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206 | }
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207 | /**
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208 | * Sets the focus classes on the element based on the given focus origin.
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209 | * @param element The element to update the classes on.
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210 | * @param origin The focus origin.
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211 | */
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212 | _setClasses(element, origin) {
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213 | this._toggleClass(element, 'cdk-focused', !!origin);
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214 | this._toggleClass(element, 'cdk-touch-focused', origin === 'touch');
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215 | this._toggleClass(element, 'cdk-keyboard-focused', origin === 'keyboard');
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216 | this._toggleClass(element, 'cdk-mouse-focused', origin === 'mouse');
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217 | this._toggleClass(element, 'cdk-program-focused', origin === 'program');
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218 | }
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219 | /**
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220 | * Updates the focus origin. If we're using immediate detection mode, we schedule an async
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221 | * function to clear the origin at the end of a timeout. The duration of the timeout depends on
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222 | * the origin being set.
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223 | * @param origin The origin to set.
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224 | * @param isFromInteraction Whether we are setting the origin from an interaction event.
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225 | */
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226 | _setOrigin(origin, isFromInteraction = false) {
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227 | this._ngZone.runOutsideAngular(() => {
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228 | this._origin = origin;
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229 | this._originFromTouchInteraction = (origin === 'touch') && isFromInteraction;
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230 | // If we're in IMMEDIATE mode, reset the origin at the next tick (or in `TOUCH_BUFFER_MS` ms
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231 | // for a touch event). We reset the origin at the next tick because Firefox focuses one tick
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232 | // after the interaction event. We wait `TOUCH_BUFFER_MS` ms before resetting the origin for
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233 | // a touch event because when a touch event is fired, the associated focus event isn't yet in
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234 | // the event queue. Before doing so, clear any pending timeouts.
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235 | if (this._detectionMode === 0 /* IMMEDIATE */) {
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236 | clearTimeout(this._originTimeoutId);
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237 | const ms = this._originFromTouchInteraction ? TOUCH_BUFFER_MS : 1;
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238 | this._originTimeoutId = setTimeout(() => this._origin = null, ms);
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239 | }
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240 | });
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241 | }
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242 | /**
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243 | * Handles focus events on a registered element.
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244 | * @param event The focus event.
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245 | * @param element The monitored element.
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246 | */
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247 | _onFocus(event, element) {
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248 | // NOTE(mmalerba): We currently set the classes based on the focus origin of the most recent
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249 | // focus event affecting the monitored element. If we want to use the origin of the first event
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250 | // instead we should check for the cdk-focused class here and return if the element already has
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251 | // it. (This only matters for elements that have includesChildren = true).
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252 | // If we are not counting child-element-focus as focused, make sure that the event target is the
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253 | // monitored element itself.
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254 | const elementInfo = this._elementInfo.get(element);
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255 | const focusEventTarget = _getEventTarget(event);
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256 | if (!elementInfo || (!elementInfo.checkChildren && element !== focusEventTarget)) {
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257 | return;
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258 | }
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259 | this._originChanged(element, this._getFocusOrigin(focusEventTarget), elementInfo);
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260 | }
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261 | /**
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262 | * Handles blur events on a registered element.
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263 | * @param event The blur event.
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264 | * @param element The monitored element.
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265 | */
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266 | _onBlur(event, element) {
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267 | // If we are counting child-element-focus as focused, make sure that we aren't just blurring in
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268 | // order to focus another child of the monitored element.
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269 | const elementInfo = this._elementInfo.get(element);
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270 | if (!elementInfo || (elementInfo.checkChildren && event.relatedTarget instanceof Node &&
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271 | element.contains(event.relatedTarget))) {
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272 | return;
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273 | }
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274 | this._setClasses(element);
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275 | this._emitOrigin(elementInfo.subject, null);
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276 | }
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277 | _emitOrigin(subject, origin) {
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278 | this._ngZone.run(() => subject.next(origin));
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279 | }
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280 | _registerGlobalListeners(elementInfo) {
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281 | if (!this._platform.isBrowser) {
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282 | return;
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283 | }
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284 | const rootNode = elementInfo.rootNode;
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285 | const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;
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286 | if (!rootNodeFocusListeners) {
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287 | this._ngZone.runOutsideAngular(() => {
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288 | rootNode.addEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
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289 | rootNode.addEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
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290 | });
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291 | }
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292 | this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);
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293 | // Register global listeners when first element is monitored.
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294 | if (++this._monitoredElementCount === 1) {
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295 | // Note: we listen to events in the capture phase so we
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296 | // can detect them even if the user stops propagation.
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297 | this._ngZone.runOutsideAngular(() => {
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298 | const window = this._getWindow();
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299 | window.addEventListener('focus', this._windowFocusListener);
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300 | });
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301 | // The InputModalityDetector is also just a collection of global listeners.
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302 | this._inputModalityDetector.modalityDetected
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303 | .pipe(takeUntil(this._stopInputModalityDetector))
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304 | .subscribe(modality => { this._setOrigin(modality, true /* isFromInteraction */); });
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305 | }
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306 | }
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307 | _removeGlobalListeners(elementInfo) {
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308 | const rootNode = elementInfo.rootNode;
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309 | if (this._rootNodeFocusListenerCount.has(rootNode)) {
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310 | const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode);
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311 | if (rootNodeFocusListeners > 1) {
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312 | this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);
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313 | }
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314 | else {
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315 | rootNode.removeEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
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316 | rootNode.removeEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
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317 | this._rootNodeFocusListenerCount.delete(rootNode);
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318 | }
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319 | }
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320 | // Unregister global listeners when last element is unmonitored.
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321 | if (!--this._monitoredElementCount) {
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322 | const window = this._getWindow();
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323 | window.removeEventListener('focus', this._windowFocusListener);
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324 | // Equivalently, stop our InputModalityDetector subscription.
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325 | this._stopInputModalityDetector.next();
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326 | // Clear timeouts for all potentially pending timeouts to prevent the leaks.
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327 | clearTimeout(this._windowFocusTimeoutId);
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328 | clearTimeout(this._originTimeoutId);
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329 | }
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330 | }
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331 | /** Updates all the state on an element once its focus origin has changed. */
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332 | _originChanged(element, origin, elementInfo) {
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333 | this._setClasses(element, origin);
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334 | this._emitOrigin(elementInfo.subject, origin);
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335 | this._lastFocusOrigin = origin;
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336 | }
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337 | /**
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338 | * Collects the `MonitoredElementInfo` of a particular element and
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339 | * all of its ancestors that have enabled `checkChildren`.
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340 | * @param element Element from which to start the search.
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341 | */
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342 | _getClosestElementsInfo(element) {
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343 | const results = [];
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344 | this._elementInfo.forEach((info, currentElement) => {
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345 | if (currentElement === element || (info.checkChildren && currentElement.contains(element))) {
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346 | results.push([currentElement, info]);
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347 | }
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348 | });
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349 | return results;
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350 | }
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351 | }
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352 | FocusMonitor.ɵprov = i0.ɵɵdefineInjectable({ factory: function FocusMonitor_Factory() { return new FocusMonitor(i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i1.Platform), i0.ɵɵinject(i2.InputModalityDetector), i0.ɵɵinject(i3.DOCUMENT, 8), i0.ɵɵinject(FOCUS_MONITOR_DEFAULT_OPTIONS, 8)); }, token: FocusMonitor, providedIn: "root" });
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353 | FocusMonitor.decorators = [
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354 | { type: Injectable, args: [{ providedIn: 'root' },] }
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355 | ];
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356 | FocusMonitor.ctorParameters = () => [
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357 | { type: NgZone },
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358 | { type: Platform },
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359 | { type: InputModalityDetector },
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360 | { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DOCUMENT,] }] },
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361 | { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [FOCUS_MONITOR_DEFAULT_OPTIONS,] }] }
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362 | ];
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363 | /**
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364 | * Directive that determines how a particular element was focused (via keyboard, mouse, touch, or
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365 | * programmatically) and adds corresponding classes to the element.
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366 | *
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367 | * There are two variants of this directive:
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368 | * 1) cdkMonitorElementFocus: does not consider an element to be focused if one of its children is
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369 | * focused.
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370 | * 2) cdkMonitorSubtreeFocus: considers an element focused if it or any of its children are focused.
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371 | */
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372 | export class CdkMonitorFocus {
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373 | constructor(_elementRef, _focusMonitor) {
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374 | this._elementRef = _elementRef;
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375 | this._focusMonitor = _focusMonitor;
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376 | this.cdkFocusChange = new EventEmitter();
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377 | }
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378 | ngAfterViewInit() {
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379 | const element = this._elementRef.nativeElement;
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380 | this._monitorSubscription = this._focusMonitor.monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))
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381 | .subscribe(origin => this.cdkFocusChange.emit(origin));
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382 | }
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383 | ngOnDestroy() {
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384 | this._focusMonitor.stopMonitoring(this._elementRef);
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385 | if (this._monitorSubscription) {
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386 | this._monitorSubscription.unsubscribe();
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387 | }
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388 | }
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389 | }
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390 | CdkMonitorFocus.decorators = [
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391 | { type: Directive, args: [{
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392 | selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',
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393 | },] }
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394 | ];
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395 | CdkMonitorFocus.ctorParameters = () => [
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396 | { type: ElementRef },
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397 | { type: FocusMonitor }
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398 | ];
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399 | CdkMonitorFocus.propDecorators = {
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400 | cdkFocusChange: [{ type: Output }]
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401 | };
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402 | //# 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* @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 {\n  Platform,\n  normalizePassiveListenerOptions,\n  _getShadowRoot,\n  _getEventTarget,\n} from '@angular/cdk/platform';\nimport {\n  Directive,\n  ElementRef,\n  EventEmitter,\n  Inject,\n  Injectable,\n  InjectionToken,\n  NgZone,\n  OnDestroy,\n  Optional,\n  Output,\n  AfterViewInit,\n} from '@angular/core';\nimport {Observable, of as observableOf, Subject, Subscription} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {coerceElement} from '@angular/cdk/coercion';\nimport {DOCUMENT} from '@angular/common';\nimport {\n  InputModalityDetector,\n  TOUCH_BUFFER_MS,\n} from '../input-modality/input-modality-detector';\n\n\nexport type FocusOrigin = 'touch' | 'mouse' | 'keyboard' | 'program' | null;\n\n/**\n * Corresponds to the options that can be passed to the native `focus` event.\n * via https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus\n */\nexport interface FocusOptions {\n  /** Whether the browser should scroll to the element when it is focused. */\n  preventScroll?: boolean;\n}\n\n/** Detection mode used for attributing the origin of a focus event. */\nexport const enum FocusMonitorDetectionMode {\n  /**\n   * Any mousedown, keydown, or touchstart event that happened in the previous\n   * tick or the current tick will be used to assign a focus event's origin (to\n   * either mouse, keyboard, or touch). This is the default option.\n   */\n  IMMEDIATE,\n  /**\n   * A focus event's origin is always attributed to the last corresponding\n   * mousedown, keydown, or touchstart event, no matter how long ago it occurred.\n   */\n  EVENTUAL\n}\n\n/** Injectable service-level options for FocusMonitor. */\nexport interface FocusMonitorOptions {\n  detectionMode?: FocusMonitorDetectionMode;\n}\n\n/** InjectionToken for FocusMonitorOptions. */\nexport const FOCUS_MONITOR_DEFAULT_OPTIONS =\n    new InjectionToken<FocusMonitorOptions>('cdk-focus-monitor-default-options');\n\ntype MonitoredElementInfo = {\n  checkChildren: boolean,\n  readonly subject: Subject<FocusOrigin>,\n  rootNode: HTMLElement|ShadowRoot|Document\n};\n\n/**\n * Event listener options that enable capturing and also\n * mark the listener as passive if the browser supports it.\n */\nconst captureEventListenerOptions = normalizePassiveListenerOptions({\n  passive: true,\n  capture: true\n});\n\n\n/** Monitors mouse and keyboard events to determine the cause of focus events. */\n@Injectable({providedIn: 'root'})\nexport class FocusMonitor implements OnDestroy {\n  /** The focus origin that the next focus event is a result of. */\n  private _origin: FocusOrigin = null;\n\n  /** The FocusOrigin of the last focus event tracked by the FocusMonitor. */\n  private _lastFocusOrigin: FocusOrigin;\n\n  /** Whether the window has just been focused. */\n  private _windowFocused = false;\n\n  /** The timeout id of the window focus timeout. */\n  private _windowFocusTimeoutId: number;\n\n  /** The timeout id of the origin clearing timeout. */\n  private _originTimeoutId: number;\n\n  /**\n   * Whether the origin was determined via a touch interaction. Necessary as properly attributing\n   * focus events to touch interactions requires special logic.\n   */\n  private _originFromTouchInteraction = false;\n\n  /** Map of elements being monitored to their info. */\n  private _elementInfo = new Map<HTMLElement, MonitoredElementInfo>();\n\n  /** The number of elements currently being monitored. */\n  private _monitoredElementCount = 0;\n\n  /**\n   * Keeps track of the root nodes to which we've currently bound a focus/blur handler,\n   * as well as the number of monitored elements that they contain. We have to treat focus/blur\n   * handlers differently from the rest of the events, because the browser won't emit events\n   * to the document when focus moves inside of a shadow root.\n   */\n  private _rootNodeFocusListenerCount = new Map<HTMLElement|Document|ShadowRoot, number>();\n\n  /**\n   * The specified detection mode, used for attributing the origin of a focus\n   * event.\n   */\n  private readonly _detectionMode: FocusMonitorDetectionMode;\n\n  /**\n   * Event listener for `focus` events on the window.\n   * Needs to be an arrow function in order to preserve the context when it gets bound.\n   */\n  private _windowFocusListener = () => {\n    // Make a note of when the window regains focus, so we can\n    // restore the origin info for the focused element.\n    this._windowFocused = true;\n    this._windowFocusTimeoutId = setTimeout(() => this._windowFocused = false);\n  }\n\n  /** Used to reference correct document/window */\n  protected _document?: Document;\n\n  /** Subject for stopping our InputModalityDetector subscription. */\n  private readonly _stopInputModalityDetector = new Subject<void>();\n\n  constructor(\n      private _ngZone: NgZone,\n      private _platform: Platform,\n      private readonly _inputModalityDetector: InputModalityDetector,\n      /** @breaking-change 11.0.0 make document required */\n      @Optional() @Inject(DOCUMENT) document: any|null,\n      @Optional() @Inject(FOCUS_MONITOR_DEFAULT_OPTIONS) options:\n          FocusMonitorOptions|null) {\n    this._document = document;\n    this._detectionMode = options?.detectionMode || FocusMonitorDetectionMode.IMMEDIATE;\n  }\n  /**\n   * Event listener for `focus` and 'blur' events on the document.\n   * Needs to be an arrow function in order to preserve the context when it gets bound.\n   */\n  private _rootNodeFocusAndBlurListener = (event: Event) => {\n    const target = _getEventTarget<HTMLElement>(event);\n    const handler = event.type === 'focus' ? this._onFocus : this._onBlur;\n\n    // We need to walk up the ancestor chain in order to support `checkChildren`.\n    for (let element = target; element; element = element.parentElement) {\n      handler.call(this, event as FocusEvent, element);\n    }\n  }\n\n  /**\n   * Monitors focus on an element and applies appropriate CSS classes.\n   * @param element The element to monitor\n   * @param checkChildren Whether to count the element as focused when its children are focused.\n   * @returns An observable that emits when the focus state of the element changes.\n   *     When the element is blurred, null will be emitted.\n   */\n  monitor(element: HTMLElement, checkChildren?: boolean): Observable<FocusOrigin>;\n\n  /**\n   * Monitors focus on an element and applies appropriate CSS classes.\n   * @param element The element to monitor\n   * @param checkChildren Whether to count the element as focused when its children are focused.\n   * @returns An observable that emits when the focus state of the element changes.\n   *     When the element is blurred, null will be emitted.\n   */\n  monitor(element: ElementRef<HTMLElement>, checkChildren?: boolean): Observable<FocusOrigin>;\n\n  monitor(element: HTMLElement | ElementRef<HTMLElement>,\n          checkChildren: boolean = false): Observable<FocusOrigin> {\n    const nativeElement = coerceElement(element);\n\n    // Do nothing if we're not on the browser platform or the passed in node isn't an element.\n    if (!this._platform.isBrowser || nativeElement.nodeType !== 1) {\n      return observableOf(null);\n    }\n\n    // If the element is inside the shadow DOM, we need to bind our focus/blur listeners to\n    // the shadow root, rather than the `document`, because the browser won't emit focus events\n    // to the `document`, if focus is moving within the same shadow root.\n    const rootNode = _getShadowRoot(nativeElement) || this._getDocument();\n    const cachedInfo = this._elementInfo.get(nativeElement);\n\n    // Check if we're already monitoring this element.\n    if (cachedInfo) {\n      if (checkChildren) {\n        // TODO(COMP-318): this can be problematic, because it'll turn all non-checkChildren\n        // observers into ones that behave as if `checkChildren` was turned on. We need a more\n        // robust solution.\n        cachedInfo.checkChildren = true;\n      }\n\n      return cachedInfo.subject;\n    }\n\n    // Create monitored element info.\n    const info: MonitoredElementInfo = {\n      checkChildren: checkChildren,\n      subject: new Subject<FocusOrigin>(),\n      rootNode\n    };\n    this._elementInfo.set(nativeElement, info);\n    this._registerGlobalListeners(info);\n\n    return info.subject;\n  }\n\n  /**\n   * Stops monitoring an element and removes all focus classes.\n   * @param element The element to stop monitoring.\n   */\n  stopMonitoring(element: HTMLElement): void;\n\n  /**\n   * Stops monitoring an element and removes all focus classes.\n   * @param element The element to stop monitoring.\n   */\n  stopMonitoring(element: ElementRef<HTMLElement>): void;\n\n  stopMonitoring(element: HTMLElement | ElementRef<HTMLElement>): void {\n    const nativeElement = coerceElement(element);\n    const elementInfo = this._elementInfo.get(nativeElement);\n\n    if (elementInfo) {\n      elementInfo.subject.complete();\n\n      this._setClasses(nativeElement);\n      this._elementInfo.delete(nativeElement);\n      this._removeGlobalListeners(elementInfo);\n    }\n  }\n\n  /**\n   * Focuses the element via the specified focus origin.\n   * @param element Element to focus.\n   * @param origin Focus origin.\n   * @param options Options that can be used to configure the focus behavior.\n   */\n  focusVia(element: HTMLElement, origin: FocusOrigin, options?: FocusOptions): void;\n\n  /**\n   * Focuses the element via the specified focus origin.\n   * @param element Element to focus.\n   * @param origin Focus origin.\n   * @param options Options that can be used to configure the focus behavior.\n   */\n  focusVia(element: ElementRef<HTMLElement>, origin: FocusOrigin, options?: FocusOptions): void;\n\n  focusVia(element: HTMLElement | ElementRef<HTMLElement>,\n          origin: FocusOrigin,\n          options?: FocusOptions): void {\n\n    const nativeElement = coerceElement(element);\n    const focusedElement = this._getDocument().activeElement;\n\n    // If the element is focused already, calling `focus` again won't trigger the event listener\n    // which means that the focus classes won't be updated. If that's the case, update the classes\n    // directly without waiting for an event.\n    if (nativeElement === focusedElement) {\n      this._getClosestElementsInfo(nativeElement)\n        .forEach(([currentElement, info]) => this._originChanged(currentElement, origin, info));\n    } else {\n      this._setOrigin(origin);\n\n      // `focus` isn't available on the server\n      if (typeof nativeElement.focus === 'function') {\n        nativeElement.focus(options);\n      }\n    }\n  }\n\n  ngOnDestroy() {\n    this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));\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  private _toggleClass(element: Element, className: string, shouldSet: boolean) {\n    if (shouldSet) {\n      element.classList.add(className);\n    } else {\n      element.classList.remove(className);\n    }\n  }\n\n  private _getFocusOrigin(focusEventTarget: HTMLElement | null): FocusOrigin {\n    if (this._origin) {\n      // If the origin was realized via a touch interaction, we need to perform additional checks\n      // to determine whether the focus origin should be attributed to touch or program.\n      if (this._originFromTouchInteraction) {\n        return this._shouldBeAttributedToTouch(focusEventTarget) ? 'touch' : 'program';\n      } else {\n        return this._origin;\n      }\n    }\n\n    // If the window has just regained focus, we can restore the most recent origin from before the\n    // window blurred. Otherwise, we've reached the point where we can't identify the source of the\n    // focus. This typically means one of two things happened:\n    //\n    // 1) The element was programmatically focused, or\n    // 2) The element was focused via screen reader navigation (which generally doesn't fire\n    //    events).\n    //\n    // Because we can't distinguish between these two cases, we default to setting `program`.\n    return (this._windowFocused && this._lastFocusOrigin) ? this._lastFocusOrigin : 'program';\n  }\n\n  /**\n   * Returns whether the focus event should be attributed to touch. Recall that in IMMEDIATE mode, a\n   * touch origin isn't immediately reset at the next tick (see _setOrigin). This means that when we\n   * handle a focus event following a touch interaction, we need to determine whether (1) the focus\n   * event was directly caused by the touch interaction or (2) the focus event was caused by a\n   * subsequent programmatic focus call triggered by the touch interaction.\n   * @param focusEventTarget The target of the focus event under examination.\n   */\n  private _shouldBeAttributedToTouch(focusEventTarget: HTMLElement | null): boolean {\n    // Please note that this check is not perfect. Consider the following edge case:\n    //\n    // <div #parent tabindex=\"0\">\n    //   <div #child tabindex=\"0\" (click)=\"#parent.focus()\"></div>\n    // </div>\n    //\n    // Suppose there is a FocusMonitor in IMMEDIATE mode attached to #parent. When the user touches\n    // #child, #parent is programmatically focused. This code will attribute the focus to touch\n    // instead of program. This is a relatively minor edge-case that can be worked around by using\n    // focusVia(parent, 'program') to focus #parent.\n    return (this._detectionMode === FocusMonitorDetectionMode.EVENTUAL) ||\n        !!focusEventTarget?.contains(this._inputModalityDetector._mostRecentTarget);\n  }\n\n  /**\n   * Sets the focus classes on the element based on the given focus origin.\n   * @param element The element to update the classes on.\n   * @param origin The focus origin.\n   */\n  private _setClasses(element: HTMLElement, origin?: FocusOrigin): void {\n    this._toggleClass(element, 'cdk-focused', !!origin);\n    this._toggleClass(element, 'cdk-touch-focused', origin === 'touch');\n    this._toggleClass(element, 'cdk-keyboard-focused', origin === 'keyboard');\n    this._toggleClass(element, 'cdk-mouse-focused', origin === 'mouse');\n    this._toggleClass(element, 'cdk-program-focused', origin === 'program');\n  }\n\n  /**\n   * Updates the focus origin. If we're using immediate detection mode, we schedule an async\n   * function to clear the origin at the end of a timeout. The duration of the timeout depends on\n   * the origin being set.\n   * @param origin The origin to set.\n   * @param isFromInteraction Whether we are setting the origin from an interaction event.\n   */\n  private _setOrigin(origin: FocusOrigin, isFromInteraction = false): void {\n    this._ngZone.runOutsideAngular(() => {\n      this._origin = origin;\n      this._originFromTouchInteraction = (origin === 'touch') && isFromInteraction;\n\n      // If we're in IMMEDIATE mode, reset the origin at the next tick (or in `TOUCH_BUFFER_MS` ms\n      // for a touch event). We reset the origin at the next tick because Firefox focuses one tick\n      // after the interaction event. We wait `TOUCH_BUFFER_MS` ms before resetting the origin for\n      // a touch event because when a touch event is fired, the associated focus event isn't yet in\n      // the event queue. Before doing so, clear any pending timeouts.\n      if (this._detectionMode === FocusMonitorDetectionMode.IMMEDIATE) {\n        clearTimeout(this._originTimeoutId);\n        const ms = this._originFromTouchInteraction ? TOUCH_BUFFER_MS : 1;\n        this._originTimeoutId = setTimeout(() => this._origin = null, ms);\n      }\n    });\n  }\n\n  /**\n   * Handles focus events on a registered element.\n   * @param event The focus event.\n   * @param element The monitored element.\n   */\n  private _onFocus(event: FocusEvent, element: HTMLElement) {\n    // NOTE(mmalerba): We currently set the classes based on the focus origin of the most recent\n    // focus event affecting the monitored element. If we want to use the origin of the first event\n    // instead we should check for the cdk-focused class here and return if the element already has\n    // it. (This only matters for elements that have includesChildren = true).\n\n    // If we are not counting child-element-focus as focused, make sure that the event target is the\n    // monitored element itself.\n    const elementInfo = this._elementInfo.get(element);\n    const focusEventTarget = _getEventTarget<HTMLElement>(event);\n    if (!elementInfo || (!elementInfo.checkChildren && element !== focusEventTarget)) {\n      return;\n    }\n\n    this._originChanged(element, this._getFocusOrigin(focusEventTarget), elementInfo);\n  }\n\n  /**\n   * Handles blur events on a registered element.\n   * @param event The blur event.\n   * @param element The monitored element.\n   */\n  _onBlur(event: FocusEvent, element: HTMLElement) {\n    // If we are counting child-element-focus as focused, make sure that we aren't just blurring in\n    // order to focus another child of the monitored element.\n    const elementInfo = this._elementInfo.get(element);\n\n    if (!elementInfo || (elementInfo.checkChildren && event.relatedTarget instanceof Node &&\n        element.contains(event.relatedTarget))) {\n      return;\n    }\n\n    this._setClasses(element);\n    this._emitOrigin(elementInfo.subject, null);\n  }\n\n  private _emitOrigin(subject: Subject<FocusOrigin>, origin: FocusOrigin) {\n    this._ngZone.run(() => subject.next(origin));\n  }\n\n  private _registerGlobalListeners(elementInfo: MonitoredElementInfo) {\n    if (!this._platform.isBrowser) {\n      return;\n    }\n\n    const rootNode = elementInfo.rootNode;\n    const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;\n\n    if (!rootNodeFocusListeners) {\n      this._ngZone.runOutsideAngular(() => {\n        rootNode.addEventListener('focus', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        rootNode.addEventListener('blur', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n      });\n    }\n\n    this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);\n\n    // Register global listeners when first element is monitored.\n    if (++this._monitoredElementCount === 1) {\n      // Note: we listen to events in the capture phase so we\n      // can detect them even if the user stops propagation.\n      this._ngZone.runOutsideAngular(() => {\n        const window = this._getWindow();\n        window.addEventListener('focus', this._windowFocusListener);\n      });\n\n      // The InputModalityDetector is also just a collection of global listeners.\n      this._inputModalityDetector.modalityDetected\n        .pipe(takeUntil(this._stopInputModalityDetector))\n        .subscribe(modality => { this._setOrigin(modality, true /* isFromInteraction */); });\n    }\n  }\n\n  private _removeGlobalListeners(elementInfo: MonitoredElementInfo) {\n    const rootNode = elementInfo.rootNode;\n\n    if (this._rootNodeFocusListenerCount.has(rootNode)) {\n      const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode)!;\n\n      if (rootNodeFocusListeners > 1) {\n        this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);\n      } else {\n        rootNode.removeEventListener('focus', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        rootNode.removeEventListener('blur', this._rootNodeFocusAndBlurListener,\n          captureEventListenerOptions);\n        this._rootNodeFocusListenerCount.delete(rootNode);\n      }\n    }\n\n    // Unregister global listeners when last element is unmonitored.\n    if (!--this._monitoredElementCount) {\n      const window = this._getWindow();\n      window.removeEventListener('focus', this._windowFocusListener);\n\n      // Equivalently, stop our InputModalityDetector subscription.\n      this._stopInputModalityDetector.next();\n\n      // Clear timeouts for all potentially pending timeouts to prevent the leaks.\n      clearTimeout(this._windowFocusTimeoutId);\n      clearTimeout(this._originTimeoutId);\n    }\n  }\n\n  /** Updates all the state on an element once its focus origin has changed. */\n  private _originChanged(element: HTMLElement, origin: FocusOrigin,\n                         elementInfo: MonitoredElementInfo) {\n    this._setClasses(element, origin);\n    this._emitOrigin(elementInfo.subject, origin);\n    this._lastFocusOrigin = origin;\n  }\n\n  /**\n   * Collects the `MonitoredElementInfo` of a particular element and\n   * all of its ancestors that have enabled `checkChildren`.\n   * @param element Element from which to start the search.\n   */\n  private _getClosestElementsInfo(element: HTMLElement): [HTMLElement, MonitoredElementInfo][] {\n    const results: [HTMLElement, MonitoredElementInfo][] = [];\n\n    this._elementInfo.forEach((info, currentElement) => {\n      if (currentElement === element || (info.checkChildren && currentElement.contains(element))) {\n        results.push([currentElement, info]);\n      }\n    });\n\n    return results;\n  }\n}\n\n/**\n * Directive that determines how a particular element was focused (via keyboard, mouse, touch, or\n * programmatically) and adds corresponding classes to the element.\n *\n * There are two variants of this directive:\n * 1) cdkMonitorElementFocus: does not consider an element to be focused if one of its children is\n *    focused.\n * 2) cdkMonitorSubtreeFocus: considers an element focused if it or any of its children are focused.\n */\n@Directive({\n  selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',\n})\nexport class CdkMonitorFocus implements AfterViewInit, OnDestroy {\n  private _monitorSubscription: Subscription;\n  @Output() readonly cdkFocusChange = new EventEmitter<FocusOrigin>();\n\n  constructor(private _elementRef: ElementRef<HTMLElement>, private _focusMonitor: FocusMonitor) {}\n\n  ngAfterViewInit() {\n    const element = this._elementRef.nativeElement;\n    this._monitorSubscription = this._focusMonitor.monitor(\n      element,\n      element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))\n    .subscribe(origin => this.cdkFocusChange.emit(origin));\n  }\n\n  ngOnDestroy() {\n    this._focusMonitor.stopMonitoring(this._elementRef);\n\n    if (this._monitorSubscription) {\n      this._monitorSubscription.unsubscribe();\n    }\n  }\n}\n"]} |
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