@angular/cdk
Version:
Angular Material Component Development Kit
290 lines • 39.9 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { QueryList } from '@angular/core';
import { Subject, Subscription } from 'rxjs';
import { UP_ARROW, DOWN_ARROW, LEFT_ARROW, RIGHT_ARROW, TAB, A, Z, ZERO, NINE, hasModifierKey, } from '@angular/cdk/keycodes';
import { debounceTime, filter, map, tap } from 'rxjs/operators';
/**
* This class manages keyboard events for selectable lists. If you pass it a query list
* of items, it will set the active item correctly when arrow events occur.
*/
export class ListKeyManager {
constructor(_items) {
this._items = _items;
this._activeItemIndex = -1;
this._activeItem = null;
this._wrap = false;
this._letterKeyStream = new Subject();
this._typeaheadSubscription = Subscription.EMPTY;
this._vertical = true;
this._allowedModifierKeys = [];
/**
* Predicate function that can be used to check whether an item should be skipped
* by the key manager. By default, disabled items are skipped.
*/
this._skipPredicateFn = (item) => item.disabled;
// Buffer for the letters that the user has pressed when the typeahead option is turned on.
this._pressedLetters = [];
/**
* Stream that emits any time the TAB key is pressed, so components can react
* when focus is shifted off of the list.
*/
this.tabOut = new Subject();
/** Stream that emits whenever the active item of the list manager changes. */
this.change = new Subject();
// We allow for the items to be an array because, in some cases, the consumer may
// not have access to a QueryList of the items they want to manage (e.g. when the
// items aren't being collected via `ViewChildren` or `ContentChildren`).
if (_items instanceof QueryList) {
_items.changes.subscribe((newItems) => {
if (this._activeItem) {
const itemArray = newItems.toArray();
const newIndex = itemArray.indexOf(this._activeItem);
if (newIndex > -1 && newIndex !== this._activeItemIndex) {
this._activeItemIndex = newIndex;
}
}
});
}
}
/**
* Sets the predicate function that determines which items should be skipped by the
* list key manager.
* @param predicate Function that determines whether the given item should be skipped.
*/
skipPredicate(predicate) {
this._skipPredicateFn = predicate;
return this;
}
/**
* Configures wrapping mode, which determines whether the active item will wrap to
* the other end of list when there are no more items in the given direction.
* @param shouldWrap Whether the list should wrap when reaching the end.
*/
withWrap(shouldWrap = true) {
this._wrap = shouldWrap;
return this;
}
/**
* Configures whether the key manager should be able to move the selection vertically.
* @param enabled Whether vertical selection should be enabled.
*/
withVerticalOrientation(enabled = true) {
this._vertical = enabled;
return this;
}
/**
* Configures the key manager to move the selection horizontally.
* Passing in `null` will disable horizontal movement.
* @param direction Direction in which the selection can be moved.
*/
withHorizontalOrientation(direction) {
this._horizontal = direction;
return this;
}
/**
* Modifier keys which are allowed to be held down and whose default actions will be prevented
* as the user is pressing the arrow keys. Defaults to not allowing any modifier keys.
*/
withAllowedModifierKeys(keys) {
this._allowedModifierKeys = keys;
return this;
}
/**
* Turns on typeahead mode which allows users to set the active item by typing.
* @param debounceInterval Time to wait after the last keystroke before setting the active item.
*/
withTypeAhead(debounceInterval = 200) {
if (this._items.length && this._items.some(item => typeof item.getLabel !== 'function')) {
throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');
}
this._typeaheadSubscription.unsubscribe();
// Debounce the presses of non-navigational keys, collect the ones that correspond to letters
// and convert those letters back into a string. Afterwards find the first item that starts
// with that string and select it.
this._typeaheadSubscription = this._letterKeyStream.pipe(tap(letter => this._pressedLetters.push(letter)), debounceTime(debounceInterval), filter(() => this._pressedLetters.length > 0), map(() => this._pressedLetters.join(''))).subscribe(inputString => {
const items = this._getItemsArray();
// Start at 1 because we want to start searching at the item immediately
// following the current active item.
for (let i = 1; i < items.length + 1; i++) {
const index = (this._activeItemIndex + i) % items.length;
const item = items[index];
if (!this._skipPredicateFn(item) &&
item.getLabel().toUpperCase().trim().indexOf(inputString) === 0) {
this.setActiveItem(index);
break;
}
}
this._pressedLetters = [];
});
return this;
}
setActiveItem(item) {
const previousActiveItem = this._activeItem;
this.updateActiveItem(item);
if (this._activeItem !== previousActiveItem) {
this.change.next(this._activeItemIndex);
}
}
/**
* Sets the active item depending on the key event passed in.
* @param event Keyboard event to be used for determining which element should be active.
*/
onKeydown(event) {
const keyCode = event.keyCode;
const modifiers = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];
const isModifierAllowed = modifiers.every(modifier => {
return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;
});
switch (keyCode) {
case TAB:
this.tabOut.next();
return;
case DOWN_ARROW:
if (this._vertical && isModifierAllowed) {
this.setNextItemActive();
break;
}
else {
return;
}
case UP_ARROW:
if (this._vertical && isModifierAllowed) {
this.setPreviousItemActive();
break;
}
else {
return;
}
case RIGHT_ARROW:
if (this._horizontal && isModifierAllowed) {
this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive();
break;
}
else {
return;
}
case LEFT_ARROW:
if (this._horizontal && isModifierAllowed) {
this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();
break;
}
else {
return;
}
default:
if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) {
// Attempt to use the `event.key` which also maps it to the user's keyboard language,
// otherwise fall back to resolving alphanumeric characters via the keyCode.
if (event.key && event.key.length === 1) {
this._letterKeyStream.next(event.key.toLocaleUpperCase());
}
else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) {
this._letterKeyStream.next(String.fromCharCode(keyCode));
}
}
// Note that we return here, in order to avoid preventing
// the default action of non-navigational keys.
return;
}
this._pressedLetters = [];
event.preventDefault();
}
/** Index of the currently active item. */
get activeItemIndex() {
return this._activeItemIndex;
}
/** The active item. */
get activeItem() {
return this._activeItem;
}
/** Gets whether the user is currently typing into the manager using the typeahead feature. */
isTyping() {
return this._pressedLetters.length > 0;
}
/** Sets the active item to the first enabled item in the list. */
setFirstItemActive() {
this._setActiveItemByIndex(0, 1);
}
/** Sets the active item to the last enabled item in the list. */
setLastItemActive() {
this._setActiveItemByIndex(this._items.length - 1, -1);
}
/** Sets the active item to the next enabled item in the list. */
setNextItemActive() {
this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1);
}
/** Sets the active item to a previous enabled item in the list. */
setPreviousItemActive() {
this._activeItemIndex < 0 && this._wrap ? this.setLastItemActive()
: this._setActiveItemByDelta(-1);
}
updateActiveItem(item) {
const itemArray = this._getItemsArray();
const index = typeof item === 'number' ? item : itemArray.indexOf(item);
const activeItem = itemArray[index];
// Explicitly check for `null` and `undefined` because other falsy values are valid.
this._activeItem = activeItem == null ? null : activeItem;
this._activeItemIndex = index;
}
/**
* This method sets the active item, given a list of items and the delta between the
* currently active item and the new active item. It will calculate differently
* depending on whether wrap mode is turned on.
*/
_setActiveItemByDelta(delta) {
this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta);
}
/**
* Sets the active item properly given "wrap" mode. In other words, it will continue to move
* down the list until it finds an item that is not disabled, and it will wrap if it
* encounters either end of the list.
*/
_setActiveInWrapMode(delta) {
const items = this._getItemsArray();
for (let i = 1; i <= items.length; i++) {
const index = (this._activeItemIndex + (delta * i) + items.length) % items.length;
const item = items[index];
if (!this._skipPredicateFn(item)) {
this.setActiveItem(index);
return;
}
}
}
/**
* Sets the active item properly given the default mode. In other words, it will
* continue to move down the list until it finds an item that is not disabled. If
* it encounters either end of the list, it will stop and not wrap.
*/
_setActiveInDefaultMode(delta) {
this._setActiveItemByIndex(this._activeItemIndex + delta, delta);
}
/**
* Sets the active item to the first enabled item starting at the index specified. If the
* item is disabled, it will move in the fallbackDelta direction until it either
* finds an enabled item or encounters the end of the list.
*/
_setActiveItemByIndex(index, fallbackDelta) {
const items = this._getItemsArray();
if (!items[index]) {
return;
}
while (this._skipPredicateFn(items[index])) {
index += fallbackDelta;
if (!items[index]) {
return;
}
}
this.setActiveItem(index);
}
/** Returns the items as an array. */
_getItemsArray() {
return this._items instanceof QueryList ? this._items.toArray() : this._items;
}
}
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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 {QueryList} from '@angular/core';\nimport {Subject, Subscription} from 'rxjs';\nimport {\n  UP_ARROW,\n  DOWN_ARROW,\n  LEFT_ARROW,\n  RIGHT_ARROW,\n  TAB,\n  A,\n  Z,\n  ZERO,\n  NINE,\n  hasModifierKey,\n} from '@angular/cdk/keycodes';\nimport {debounceTime, filter, map, tap} from 'rxjs/operators';\n\n/** This interface is for items that can be passed to a ListKeyManager. */\nexport interface ListKeyManagerOption {\n  /** Whether the option is disabled. */\n  disabled?: boolean;\n\n  /** Gets the label for this option. */\n  getLabel?(): string;\n}\n\n/** Modifier keys handled by the ListKeyManager. */\nexport type ListKeyManagerModifierKey = 'altKey' | 'ctrlKey' | 'metaKey' | 'shiftKey';\n\n/**\n * This class manages keyboard events for selectable lists. 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 _letterKeyStream = new Subject<string>();\n  private _typeaheadSubscription = Subscription.EMPTY;\n  private _vertical = true;\n  private _horizontal: 'ltr' | 'rtl' | null;\n  private _allowedModifierKeys: ListKeyManagerModifierKey[] = [];\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  tabOut: Subject<void> = new Subject<void>();\n\n  /** Stream that emits whenever the active item of the list manager changes. */\n  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 (this._items.length && 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   * 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      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"]}