feat(a11y): manager for list keyboard events #1599
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| disabled: boolean; | ||
| } | ||
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| export class ListKeyManager { |
| import {EventEmitter, Output, QueryList} from '@angular/core'; | ||
| import {UP_ARROW, DOWN_ARROW, TAB} from '../core'; | ||
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| export interface MdFocusable { |
| export class ListKeyManager { | ||
| private _focusedItemIndex: number; | ||
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| @Output() tabOut: EventEmitter<null> = new EventEmitter(); |
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Add field description.
Also, should it be EventEmitter<void>?
| this._focusedItemIndex = value; | ||
| } | ||
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| // TODO(kara): update this when (keydown.downArrow) testability is fixed |
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I don't this this TODO applies any more
| disabled: boolean; | ||
| } | ||
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| export class ListKeyManager { |
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We should have unit tests for just this class (with some fake MdFocusable items)
| import {EventEmitter, Output, QueryList} from '@angular/core'; | ||
| import {UP_ARROW, DOWN_ARROW, TAB} from '../core'; | ||
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| export interface MdFocusable { |
| this._focusedItemIndex = value; | ||
| } | ||
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| // TODO(kara): update this when (keydown.downArrow) testability is fixed |
| */ | ||
| _focusFirstItem() { | ||
| this.items.first.focus(); | ||
| this._keyManager.focusedItemIndex = 0; |
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// The menu always opens with the first item focused.| export class ListKeyManager { | ||
| private _focusedItemIndex: number; | ||
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| @Output() tabOut: EventEmitter<null> = new EventEmitter(); |
| private _updateFocusedItemIndex(delta: number, items: MdFocusable[]) { | ||
| // when focus would leave menu, wrap to beginning or end | ||
| this._focusedItemIndex = (this._focusedItemIndex + delta + items.length) | ||
| % items.length; |
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nit: it's a little more readable to break at the highest semantic level, i.e.:
this._focusedItemIndex =
(this._focusedItemIndex + delta + items.length) % items.length;
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| import {ListKeyManager, MdFocusable} from './list-key-manager'; | ||
| import {DOWN_ARROW, UP_ARROW, TAB} from '../keyboard/keycodes'; | ||
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| class MockFocusable { |
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nit: technically it's a FakeFocusable
| new MockFocusable() | ||
| ]; | ||
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| itemList.toArray = () => { return items; }; |
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itemList.toArray = () => items;| * This event is emitted any time the TAB key is pressed, so components can react | ||
| * when focus is shifted off of the list. | ||
| */ | ||
| @Output() tabOut: EventEmitter<null> = new EventEmitter(); |
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Should this be void instead of null?
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I can change. edit: we discussed in person
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3 participants
This PR adds a reusable keyboard event manager for selectable lists (e.g. menu, select, and nav list). Existing e2e tests should cover this functionality.
r: @jelbourn