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 { QueryList } from '@angular/core';
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9 | import { Subject, Subscription } from 'rxjs';
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10 | import { UP_ARROW, DOWN_ARROW, LEFT_ARROW, RIGHT_ARROW, TAB, A, Z, ZERO, NINE, hasModifierKey, HOME, END, } from '@angular/cdk/keycodes';
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11 | import { debounceTime, filter, map, tap } from 'rxjs/operators';
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12 | /**
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13 | * This class manages keyboard events for selectable lists. If you pass it a query list
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14 | * of items, it will set the active item correctly when arrow events occur.
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15 | */
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16 | export class ListKeyManager {
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17 | constructor(_items) {
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18 | this._items = _items;
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19 | this._activeItemIndex = -1;
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20 | this._activeItem = null;
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21 | this._wrap = false;
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22 | this._letterKeyStream = new Subject();
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23 | this._typeaheadSubscription = Subscription.EMPTY;
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24 | this._vertical = true;
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25 | this._allowedModifierKeys = [];
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26 | this._homeAndEnd = false;
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27 | /**
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28 | * Predicate function that can be used to check whether an item should be skipped
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29 | * by the key manager. By default, disabled items are skipped.
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30 | */
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31 | this._skipPredicateFn = (item) => item.disabled;
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32 | // Buffer for the letters that the user has pressed when the typeahead option is turned on.
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33 | this._pressedLetters = [];
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34 | /**
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35 | * Stream that emits any time the TAB key is pressed, so components can react
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36 | * when focus is shifted off of the list.
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37 | */
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38 | this.tabOut = new Subject();
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39 | /** Stream that emits whenever the active item of the list manager changes. */
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40 | this.change = new Subject();
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41 | // We allow for the items to be an array because, in some cases, the consumer may
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42 | // not have access to a QueryList of the items they want to manage (e.g. when the
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43 | // items aren't being collected via `ViewChildren` or `ContentChildren`).
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44 | if (_items instanceof QueryList) {
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45 | _items.changes.subscribe((newItems) => {
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46 | if (this._activeItem) {
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47 | const itemArray = newItems.toArray();
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48 | const newIndex = itemArray.indexOf(this._activeItem);
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49 | if (newIndex > -1 && newIndex !== this._activeItemIndex) {
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50 | this._activeItemIndex = newIndex;
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51 | }
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52 | }
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53 | });
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54 | }
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55 | }
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56 | /**
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57 | * Sets the predicate function that determines which items should be skipped by the
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58 | * list key manager.
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59 | * @param predicate Function that determines whether the given item should be skipped.
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60 | */
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61 | skipPredicate(predicate) {
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62 | this._skipPredicateFn = predicate;
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63 | return this;
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64 | }
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65 | /**
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66 | * Configures wrapping mode, which determines whether the active item will wrap to
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67 | * the other end of list when there are no more items in the given direction.
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68 | * @param shouldWrap Whether the list should wrap when reaching the end.
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69 | */
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70 | withWrap(shouldWrap = true) {
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71 | this._wrap = shouldWrap;
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72 | return this;
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73 | }
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74 | /**
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75 | * Configures whether the key manager should be able to move the selection vertically.
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76 | * @param enabled Whether vertical selection should be enabled.
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77 | */
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78 | withVerticalOrientation(enabled = true) {
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79 | this._vertical = enabled;
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80 | return this;
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81 | }
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82 | /**
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83 | * Configures the key manager to move the selection horizontally.
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84 | * Passing in `null` will disable horizontal movement.
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85 | * @param direction Direction in which the selection can be moved.
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86 | */
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87 | withHorizontalOrientation(direction) {
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88 | this._horizontal = direction;
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89 | return this;
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90 | }
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91 | /**
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92 | * Modifier keys which are allowed to be held down and whose default actions will be prevented
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93 | * as the user is pressing the arrow keys. Defaults to not allowing any modifier keys.
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94 | */
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95 | withAllowedModifierKeys(keys) {
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96 | this._allowedModifierKeys = keys;
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97 | return this;
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98 | }
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99 | /**
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100 | * Turns on typeahead mode which allows users to set the active item by typing.
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101 | * @param debounceInterval Time to wait after the last keystroke before setting the active item.
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102 | */
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103 | withTypeAhead(debounceInterval = 200) {
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104 | if ((typeof ngDevMode === 'undefined' || ngDevMode) && (this._items.length &&
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105 | this._items.some(item => typeof item.getLabel !== 'function'))) {
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106 | throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');
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107 | }
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108 | this._typeaheadSubscription.unsubscribe();
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109 | // Debounce the presses of non-navigational keys, collect the ones that correspond to letters
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110 | // and convert those letters back into a string. Afterwards find the first item that starts
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111 | // with that string and select it.
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112 | this._typeaheadSubscription = this._letterKeyStream.pipe(tap(letter => this._pressedLetters.push(letter)), debounceTime(debounceInterval), filter(() => this._pressedLetters.length > 0), map(() => this._pressedLetters.join(''))).subscribe(inputString => {
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113 | const items = this._getItemsArray();
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114 | // Start at 1 because we want to start searching at the item immediately
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115 | // following the current active item.
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116 | for (let i = 1; i < items.length + 1; i++) {
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117 | const index = (this._activeItemIndex + i) % items.length;
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118 | const item = items[index];
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119 | if (!this._skipPredicateFn(item) &&
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120 | item.getLabel().toUpperCase().trim().indexOf(inputString) === 0) {
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121 | this.setActiveItem(index);
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122 | break;
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123 | }
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124 | }
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125 | this._pressedLetters = [];
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126 | });
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127 | return this;
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128 | }
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129 | /**
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130 | * Configures the key manager to activate the first and last items
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131 | * respectively when the Home or End key is pressed.
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132 | * @param enabled Whether pressing the Home or End key activates the first/last item.
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133 | */
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134 | withHomeAndEnd(enabled = true) {
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135 | this._homeAndEnd = enabled;
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136 | return this;
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137 | }
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138 | setActiveItem(item) {
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139 | const previousActiveItem = this._activeItem;
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140 | this.updateActiveItem(item);
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141 | if (this._activeItem !== previousActiveItem) {
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142 | this.change.next(this._activeItemIndex);
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143 | }
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144 | }
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145 | /**
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146 | * Sets the active item depending on the key event passed in.
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147 | * @param event Keyboard event to be used for determining which element should be active.
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148 | */
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149 | onKeydown(event) {
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150 | const keyCode = event.keyCode;
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151 | const modifiers = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];
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152 | const isModifierAllowed = modifiers.every(modifier => {
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153 | return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;
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154 | });
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155 | switch (keyCode) {
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156 | case TAB:
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157 | this.tabOut.next();
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158 | return;
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159 | case DOWN_ARROW:
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160 | if (this._vertical && isModifierAllowed) {
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161 | this.setNextItemActive();
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162 | break;
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163 | }
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164 | else {
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165 | return;
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166 | }
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167 | case UP_ARROW:
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168 | if (this._vertical && isModifierAllowed) {
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169 | this.setPreviousItemActive();
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170 | break;
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171 | }
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172 | else {
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173 | return;
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174 | }
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175 | case RIGHT_ARROW:
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176 | if (this._horizontal && isModifierAllowed) {
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177 | this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive();
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178 | break;
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179 | }
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180 | else {
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181 | return;
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182 | }
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183 | case LEFT_ARROW:
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184 | if (this._horizontal && isModifierAllowed) {
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185 | this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();
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186 | break;
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187 | }
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188 | else {
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189 | return;
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190 | }
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191 | case HOME:
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192 | if (this._homeAndEnd && isModifierAllowed) {
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193 | this.setFirstItemActive();
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194 | break;
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195 | }
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196 | else {
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197 | return;
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198 | }
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199 | case END:
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200 | if (this._homeAndEnd && isModifierAllowed) {
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201 | this.setLastItemActive();
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202 | break;
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203 | }
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204 | else {
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205 | return;
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206 | }
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207 | default:
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208 | if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) {
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209 | // Attempt to use the `event.key` which also maps it to the user's keyboard language,
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210 | // otherwise fall back to resolving alphanumeric characters via the keyCode.
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211 | if (event.key && event.key.length === 1) {
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212 | this._letterKeyStream.next(event.key.toLocaleUpperCase());
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213 | }
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214 | else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) {
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215 | this._letterKeyStream.next(String.fromCharCode(keyCode));
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216 | }
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217 | }
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218 | // Note that we return here, in order to avoid preventing
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219 | // the default action of non-navigational keys.
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220 | return;
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221 | }
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222 | this._pressedLetters = [];
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223 | event.preventDefault();
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224 | }
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225 | /** Index of the currently active item. */
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226 | get activeItemIndex() {
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227 | return this._activeItemIndex;
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228 | }
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229 | /** The active item. */
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230 | get activeItem() {
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231 | return this._activeItem;
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232 | }
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233 | /** Gets whether the user is currently typing into the manager using the typeahead feature. */
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234 | isTyping() {
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235 | return this._pressedLetters.length > 0;
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236 | }
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237 | /** Sets the active item to the first enabled item in the list. */
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238 | setFirstItemActive() {
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239 | this._setActiveItemByIndex(0, 1);
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240 | }
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241 | /** Sets the active item to the last enabled item in the list. */
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242 | setLastItemActive() {
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243 | this._setActiveItemByIndex(this._items.length - 1, -1);
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244 | }
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245 | /** Sets the active item to the next enabled item in the list. */
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246 | setNextItemActive() {
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247 | this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1);
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248 | }
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249 | /** Sets the active item to a previous enabled item in the list. */
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250 | setPreviousItemActive() {
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251 | this._activeItemIndex < 0 && this._wrap ? this.setLastItemActive()
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252 | : this._setActiveItemByDelta(-1);
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253 | }
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254 | updateActiveItem(item) {
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255 | const itemArray = this._getItemsArray();
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256 | const index = typeof item === 'number' ? item : itemArray.indexOf(item);
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257 | const activeItem = itemArray[index];
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258 | // Explicitly check for `null` and `undefined` because other falsy values are valid.
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259 | this._activeItem = activeItem == null ? null : activeItem;
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260 | this._activeItemIndex = index;
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261 | }
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262 | /**
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263 | * This method sets the active item, given a list of items and the delta between the
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264 | * currently active item and the new active item. It will calculate differently
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265 | * depending on whether wrap mode is turned on.
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266 | */
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267 | _setActiveItemByDelta(delta) {
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268 | this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta);
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269 | }
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270 | /**
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271 | * Sets the active item properly given "wrap" mode. In other words, it will continue to move
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272 | * down the list until it finds an item that is not disabled, and it will wrap if it
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273 | * encounters either end of the list.
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274 | */
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275 | _setActiveInWrapMode(delta) {
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276 | const items = this._getItemsArray();
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277 | for (let i = 1; i <= items.length; i++) {
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278 | const index = (this._activeItemIndex + (delta * i) + items.length) % items.length;
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279 | const item = items[index];
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280 | if (!this._skipPredicateFn(item)) {
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281 | this.setActiveItem(index);
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282 | return;
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283 | }
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284 | }
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285 | }
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286 | /**
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287 | * Sets the active item properly given the default mode. In other words, it will
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288 | * continue to move down the list until it finds an item that is not disabled. If
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289 | * it encounters either end of the list, it will stop and not wrap.
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290 | */
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291 | _setActiveInDefaultMode(delta) {
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292 | this._setActiveItemByIndex(this._activeItemIndex + delta, delta);
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293 | }
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294 | /**
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295 | * Sets the active item to the first enabled item starting at the index specified. If the
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296 | * item is disabled, it will move in the fallbackDelta direction until it either
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297 | * finds an enabled item or encounters the end of the list.
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298 | */
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299 | _setActiveItemByIndex(index, fallbackDelta) {
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300 | const items = this._getItemsArray();
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301 | if (!items[index]) {
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302 | return;
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303 | }
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304 | while (this._skipPredicateFn(items[index])) {
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305 | index += fallbackDelta;
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306 | if (!items[index]) {
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307 | return;
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308 | }
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309 | }
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310 | this.setActiveItem(index);
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311 | }
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312 | /** Returns the items as an array. */
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313 | _getItemsArray() {
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314 | return this._items instanceof QueryList ? this._items.toArray() : this._items;
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315 | }
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316 | }
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317 | //# 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If you pass it a query list\n * of items, it will set the active item correctly when arrow events occur.\n */\nexport class ListKeyManager<T extends ListKeyManagerOption> {\n  private _activeItemIndex = -1;\n  private _activeItem: T | null = null;\n  private _wrap = false;\n  private readonly _letterKeyStream = new Subject<string>();\n  private _typeaheadSubscription = Subscription.EMPTY;\n  private _vertical = true;\n  private _horizontal: 'ltr' | 'rtl' | null;\n  private _allowedModifierKeys: ListKeyManagerModifierKey[] = [];\n  private _homeAndEnd = false;\n\n  /**\n   * Predicate function that can be used to check whether an item should be skipped\n   * by the key manager. By default, disabled items are skipped.\n   */\n  private _skipPredicateFn = (item: T) => item.disabled;\n\n  // Buffer for the letters that the user has pressed when the typeahead option is turned on.\n  private _pressedLetters: string[] = [];\n\n  constructor(private _items: QueryList<T> | T[]) {\n    // We allow for the items to be an array because, in some cases, the consumer may\n    // not have access to a QueryList of the items they want to manage (e.g. when the\n    // items aren't being collected via `ViewChildren` or `ContentChildren`).\n    if (_items instanceof QueryList) {\n      _items.changes.subscribe((newItems: QueryList<T>) => {\n        if (this._activeItem) {\n          const itemArray = newItems.toArray();\n          const newIndex = itemArray.indexOf(this._activeItem);\n\n          if (newIndex > -1 && newIndex !== this._activeItemIndex) {\n            this._activeItemIndex = newIndex;\n          }\n        }\n      });\n    }\n  }\n\n  /**\n   * Stream that emits any time the TAB key is pressed, so components can react\n   * when focus is shifted off of the list.\n   */\n  readonly tabOut = new Subject<void>();\n\n  /** Stream that emits whenever the active item of the list manager changes. */\n  readonly change = new Subject<number>();\n\n  /**\n   * Sets the predicate function that determines which items should be skipped by the\n   * list key manager.\n   * @param predicate Function that determines whether the given item should be skipped.\n   */\n  skipPredicate(predicate: (item: T) => boolean): this {\n    this._skipPredicateFn = predicate;\n    return this;\n  }\n\n  /**\n   * Configures wrapping mode, which determines whether the active item will wrap to\n   * the other end of list when there are no more items in the given direction.\n   * @param shouldWrap Whether the list should wrap when reaching the end.\n   */\n  withWrap(shouldWrap = true): this {\n    this._wrap = shouldWrap;\n    return this;\n  }\n\n  /**\n   * Configures whether the key manager should be able to move the selection vertically.\n   * @param enabled Whether vertical selection should be enabled.\n   */\n  withVerticalOrientation(enabled: boolean = true): this {\n    this._vertical = enabled;\n    return this;\n  }\n\n  /**\n   * Configures the key manager to move the selection horizontally.\n   * Passing in `null` will disable horizontal movement.\n   * @param direction Direction in which the selection can be moved.\n   */\n  withHorizontalOrientation(direction: 'ltr' | 'rtl' | null): this {\n    this._horizontal = direction;\n    return this;\n  }\n\n  /**\n   * Modifier keys which are allowed to be held down and whose default actions will be prevented\n   * as the user is pressing the arrow keys. Defaults to not allowing any modifier keys.\n   */\n  withAllowedModifierKeys(keys: ListKeyManagerModifierKey[]): this {\n    this._allowedModifierKeys = keys;\n    return this;\n  }\n\n  /**\n   * Turns on typeahead mode which allows users to set the active item by typing.\n   * @param debounceInterval Time to wait after the last keystroke before setting the active item.\n   */\n  withTypeAhead(debounceInterval: number = 200): this {\n    if ((typeof ngDevMode === 'undefined' || ngDevMode) && (this._items.length &&\n        this._items.some(item => typeof item.getLabel !== 'function'))) {\n      throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');\n    }\n\n    this._typeaheadSubscription.unsubscribe();\n\n    // Debounce the presses of non-navigational keys, collect the ones that correspond to letters\n    // and convert those letters back into a string. Afterwards find the first item that starts\n    // with that string and select it.\n    this._typeaheadSubscription = this._letterKeyStream.pipe(\n      tap(letter => this._pressedLetters.push(letter)),\n      debounceTime(debounceInterval),\n      filter(() => this._pressedLetters.length > 0),\n      map(() => this._pressedLetters.join(''))\n    ).subscribe(inputString => {\n      const items = this._getItemsArray();\n\n      // Start at 1 because we want to start searching at the item immediately\n      // following the current active item.\n      for (let i = 1; i < items.length + 1; i++) {\n        const index = (this._activeItemIndex + i) % items.length;\n        const item = items[index];\n\n        if (!this._skipPredicateFn(item) &&\n            item.getLabel!().toUpperCase().trim().indexOf(inputString) === 0) {\n\n          this.setActiveItem(index);\n          break;\n        }\n      }\n\n      this._pressedLetters = [];\n    });\n\n    return this;\n  }\n\n  /**\n   * Configures the key manager to activate the first and last items\n   * respectively when the Home or End key is pressed.\n   * @param enabled Whether pressing the Home or End key activates the first/last item.\n   */\n  withHomeAndEnd(enabled: boolean = true): this {\n    this._homeAndEnd = enabled;\n    return this;\n  }\n\n  /**\n   * Sets the active item to the item at the index specified.\n   * @param index The index of the item to be set as active.\n   */\n  setActiveItem(index: number): void;\n\n  /**\n   * Sets the active item to the specified item.\n   * @param item The item to be set as active.\n   */\n  setActiveItem(item: T): void;\n\n  setActiveItem(item: any): void {\n    const previousActiveItem = this._activeItem;\n\n    this.updateActiveItem(item);\n\n    if (this._activeItem !== previousActiveItem) {\n      this.change.next(this._activeItemIndex);\n    }\n  }\n\n  /**\n   * Sets the active item depending on the key event passed in.\n   * @param event Keyboard event to be used for determining which element should be active.\n   */\n  onKeydown(event: KeyboardEvent): void {\n    const keyCode = event.keyCode;\n    const modifiers: ListKeyManagerModifierKey[] = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];\n    const isModifierAllowed = modifiers.every(modifier => {\n      return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;\n    });\n\n    switch (keyCode) {\n      case TAB:\n        this.tabOut.next();\n        return;\n\n      case DOWN_ARROW:\n        if (this._vertical && isModifierAllowed) {\n          this.setNextItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      case UP_ARROW:\n        if (this._vertical && isModifierAllowed) {\n          this.setPreviousItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      case RIGHT_ARROW:\n        if (this._horizontal && isModifierAllowed) {\n          this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      case LEFT_ARROW:\n        if (this._horizontal && isModifierAllowed) {\n          this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      case HOME:\n        if (this._homeAndEnd && isModifierAllowed) {\n          this.setFirstItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      case END:\n        if (this._homeAndEnd && isModifierAllowed) {\n          this.setLastItemActive();\n          break;\n        } else {\n          return;\n        }\n\n      default:\n      if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) {\n          // Attempt to use the `event.key` which also maps it to the user's keyboard language,\n          // otherwise fall back to resolving alphanumeric characters via the keyCode.\n          if (event.key && event.key.length === 1) {\n            this._letterKeyStream.next(event.key.toLocaleUpperCase());\n          } else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) {\n            this._letterKeyStream.next(String.fromCharCode(keyCode));\n          }\n        }\n\n        // Note that we return here, in order to avoid preventing\n        // the default action of non-navigational keys.\n        return;\n    }\n\n    this._pressedLetters = [];\n    event.preventDefault();\n  }\n\n  /** Index of the currently active item. */\n  get activeItemIndex(): number | null {\n    return this._activeItemIndex;\n  }\n\n  /** The active item. */\n  get activeItem(): T | null {\n    return this._activeItem;\n  }\n\n  /** Gets whether the user is currently typing into the manager using the typeahead feature. */\n  isTyping(): boolean {\n    return this._pressedLetters.length > 0;\n  }\n\n  /** Sets the active item to the first enabled item in the list. */\n  setFirstItemActive(): void {\n    this._setActiveItemByIndex(0, 1);\n  }\n\n  /** Sets the active item to the last enabled item in the list. */\n  setLastItemActive(): void {\n    this._setActiveItemByIndex(this._items.length - 1, -1);\n  }\n\n  /** Sets the active item to the next enabled item in the list. */\n  setNextItemActive(): void {\n    this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1);\n  }\n\n  /** Sets the active item to a previous enabled item in the list. */\n  setPreviousItemActive(): void {\n    this._activeItemIndex < 0 && this._wrap ? this.setLastItemActive()\n                                            : this._setActiveItemByDelta(-1);\n  }\n\n  /**\n   * Allows setting the active without any other effects.\n   * @param index Index of the item to be set as active.\n   */\n  updateActiveItem(index: number): void;\n\n  /**\n   * Allows setting the active item without any other effects.\n   * @param item Item to be set as active.\n   */\n  updateActiveItem(item: T): void;\n\n  updateActiveItem(item: any): void {\n    const itemArray = this._getItemsArray();\n    const index = typeof item === 'number' ? item : itemArray.indexOf(item);\n    const activeItem = itemArray[index];\n\n    // Explicitly check for `null` and `undefined` because other falsy values are valid.\n    this._activeItem = activeItem == null ? null : activeItem;\n    this._activeItemIndex = index;\n  }\n\n  /**\n   * This method sets the active item, given a list of items and the delta between the\n   * currently active item and the new active item. It will calculate differently\n   * depending on whether wrap mode is turned on.\n   */\n  private _setActiveItemByDelta(delta: -1 | 1): void {\n    this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta);\n  }\n\n  /**\n   * Sets the active item properly given \"wrap\" mode. In other words, it will continue to move\n   * down the list until it finds an item that is not disabled, and it will wrap if it\n   * encounters either end of the list.\n   */\n  private _setActiveInWrapMode(delta: -1 | 1): void {\n    const items = this._getItemsArray();\n\n    for (let i = 1; i <= items.length; i++) {\n      const index = (this._activeItemIndex + (delta * i) + items.length) % items.length;\n      const item = items[index];\n\n      if (!this._skipPredicateFn(item)) {\n        this.setActiveItem(index);\n        return;\n      }\n    }\n  }\n\n  /**\n   * Sets the active item properly given the default mode. In other words, it will\n   * continue to move down the list until it finds an item that is not disabled. If\n   * it encounters either end of the list, it will stop and not wrap.\n   */\n  private _setActiveInDefaultMode(delta: -1 | 1): void {\n    this._setActiveItemByIndex(this._activeItemIndex + delta, delta);\n  }\n\n  /**\n   * Sets the active item to the first enabled item starting at the index specified. If the\n   * item is disabled, it will move in the fallbackDelta direction until it either\n   * finds an enabled item or encounters the end of the list.\n   */\n  private _setActiveItemByIndex(index: number, fallbackDelta: -1 | 1): void {\n    const items = this._getItemsArray();\n\n    if (!items[index]) {\n      return;\n    }\n\n    while (this._skipPredicateFn(items[index])) {\n      index += fallbackDelta;\n\n      if (!items[index]) {\n        return;\n      }\n    }\n\n    this.setActiveItem(index);\n  }\n\n  /** Returns the items as an array. */\n  private _getItemsArray(): T[] {\n    return this._items instanceof QueryList ? this._items.toArray() : this._items;\n  }\n}\n"]} |
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