| 1 | /* |
| 2 | Copyright - 2017 2023 - wwwouaiebe - Contact: https://www.ouaie.be/ |
| 3 | |
| 4 | This program is free software; |
| 5 | you can redistribute it and/or modify it under the terms of the |
| 6 | GNU General Public License as published by the Free Software Foundation; |
| 7 | either version 3 of the License, or any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program; if not, write to the Free Software |
| 16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | /* |
| 19 | Changes: |
| 20 | - v4.0.0: |
| 21 | - created from v3.6.0 |
| 22 | Doc reviewed 202208 |
| 23 | */ |
| 24 | |
| 25 | import { ZERO, ONE } from '../../main/Constants.js'; |
| 26 | |
| 27 | /* ------------------------------------------------------------------------------------------------------------------------- */ |
| 28 | /** |
| 29 | A simple class used to detect if the device have a touch screen |
| 30 | */ |
| 31 | /* ------------------------------------------------------------------------------------------------------------------------- */ |
| 32 | |
| 33 | class Device { |
| 34 | |
| 35 | /** |
| 36 | A flag withe touch status |
| 37 | @type {Boolean} |
| 38 | */ |
| 39 | |
| 40 | static #isTouch; |
| 41 | |
| 42 | /** |
| 43 | A touchstart event listener |
| 44 | */ |
| 45 | |
| 46 | static #touchStartEL ( ) { |
| 47 | Device.#isTouch = true; |
| 48 | document.removeEventListener ( 'touchstart', Device.#touchStartEL, true ); |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | The constructor |
| 53 | */ |
| 54 | |
| 55 | constructor ( ) { |
| 56 | Object.freeze ( this ); |
| 57 | Device.#isTouch = false; |
| 58 | document.addEventListener ( 'touchstart', Device.#touchStartEL, true ); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | The touch status. True when the device have a touch screen |
| 63 | @type {Boolean} |
| 64 | */ |
| 65 | |
| 66 | get isTouch ( ) { return Device.#isTouch; } |
| 67 | |
| 68 | /** |
| 69 | get the width and height avaiable for menus and dialogs |
| 70 | @type {Object} a read only object with width and height properties |
| 71 | */ |
| 72 | |
| 73 | get screenAvailable ( ) { |
| 74 | |
| 75 | const testHTMLElement = document.createElement ( 'div' ); |
| 76 | testHTMLElement.style.position = 'absolute'; |
| 77 | testHTMLElement.style.bottom = ZERO; |
| 78 | testHTMLElement.style.right = ZERO; |
| 79 | testHTMLElement.style.height = ONE; |
| 80 | testHTMLElement.style.width = ONE; |
| 81 | document.body.appendChild ( testHTMLElement ); |
| 82 | const boundingClientRect = testHTMLElement.getBoundingClientRect ( ); |
| 83 | const screenAvailableHeight = boundingClientRect.bottom; |
| 84 | const screenAvailableWidth = boundingClientRect.right; |
| 85 | document.body.removeChild ( testHTMLElement ); |
| 86 | |
| 87 | return Object.freeze ( |
| 88 | { |
| 89 | height : screenAvailableHeight, |
| 90 | width : screenAvailableWidth |
| 91 | } |
| 92 | ); |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | The one and only one instance of Device class |
| 98 | */ |
| 99 | |
| 100 | const theDevice = new Device ( ); |
| 101 | |
| 102 | export default theDevice; |
| 103 | |
| 104 | /* --- End of file --------------------------------------------------------------------------------------------------------- */ |
| 105 |