| // Copyright (C) 2023 The Android Open Source Project |
| // |
| // 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. |
| |
| import m from 'mithril'; |
| |
| // Check whether a DOM element contains another, or whether they're the same |
| export function isOrContains(container: Element, target: Element): boolean { |
| return container === target || container.contains(target); |
| } |
| |
| // Find a DOM element with a given "ref" attribute |
| export function findRef(root: Element, ref: string): Element|null { |
| const query = `[ref=${ref}]`; |
| if (root.matches(query)) { |
| return root; |
| } else { |
| return root.querySelector(query); |
| } |
| } |
| |
| // Safely case an Element to an HTMLElement. |
| // Throws if the element is not an HTMLElement. |
| export function toHTMLElement(el: Element): HTMLElement { |
| if (!(el instanceof HTMLElement)) { |
| throw new Error('Element is not an HTLMElement'); |
| } |
| return el as HTMLElement; |
| } |
| |
| // Check if a mithril component vnode has children |
| export function hasChildren({children}: m.Vnode<any>): boolean { |
| return Array.isArray(children) && children.length > 0; |
| } |
