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feat(list): Add arrow key a11y support. (#2871)
Add accessibility support for using arrow keys to navigate the list.
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| /** | ||
| * @license | ||
| * Copyright 2018 Google Inc. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| /* eslint no-unused-vars: [2, {"args": "none"}] */ | ||
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| /** | ||
| * Adapter for MDC List. Provides an interface for managing focus. | ||
| * | ||
| * Additionally, provides type information for the adapter to the Closure | ||
| * compiler. | ||
| * | ||
| * Implement this adapter for your framework of choice to delegate updates to | ||
| * the component in your framework of choice. See architecture documentation | ||
| * for more details. | ||
| * https://github.com/material-components/material-components-web/blob/master/docs/code/architecture.md | ||
| * | ||
| * @record | ||
| */ | ||
| class MDCListAdapter { | ||
| /** @return {Number} */ | ||
| getListItemCount() {} | ||
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| /** | ||
| * @return {Number} */ | ||
| getFocusedElementIndex() {} | ||
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| /** @param {Element} node */ | ||
| getListItemIndex(node) {} | ||
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| /** | ||
| * Focuses list item at the index specified. | ||
| * @param {Number} ndx | ||
| */ | ||
| focusItemAtIndex(ndx) {} | ||
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| /** | ||
| * Sets the tabindex to the value specified for all button/a element children of | ||
| * the list item at the index specified. | ||
| * @param {Number} listItemIndex | ||
| * @param {Number} tabIndexValue | ||
| */ | ||
| setTabIndexForListItemChildren(listItemIndex, tabIndexValue) {} | ||
| } | ||
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| export {MDCListAdapter}; |
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| /** | ||
| * @license | ||
| * Copyright 2018 Google Inc. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| /** @enum {string} */ | ||
| const cssClasses = { | ||
| LIST_ITEM_CLASS: 'mdc-list-item', | ||
| }; | ||
|
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| /** @enum {string} */ | ||
| const strings = { | ||
| ARIA_ORIENTATION: 'aria-orientation', | ||
| ARIA_ORIENTATION_VERTICAL: 'vertical', | ||
| FOCUSABLE_CHILD_ELEMENTS: 'button:not(:disabled), a', | ||
| ITEMS_SELECTOR: '.mdc-list-item', | ||
| }; | ||
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| export {strings, cssClasses}; |
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