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 | Touch event listener for the buttons container |
30 | */ |
31 | /* ------------------------------------------------------------------------------------------------------------------------- */ |
32 | |
33 | class ButtonsHTMLElementTouchEL { |
34 | |
35 | /** |
36 | The Y position of the previous touch event |
37 | @type {Number} |
38 | */ |
39 | |
40 | #touchContainerStartY; |
41 | |
42 | /** |
43 | The constructor |
44 | */ |
45 | |
46 | constructor ( ) { |
47 | Object.freeze ( this ); |
48 | this.#touchContainerStartY = Number.MAX_VALUE; |
49 | } |
50 | |
51 | /** |
52 | Event listener method |
53 | @param {Event} touchEvent The event to handle |
54 | */ |
55 | |
56 | handleEvent ( touchEvent ) { |
57 | switch ( touchEvent.type ) { |
58 | case 'touchstart' : |
59 | if ( ONE === touchEvent.changedTouches.length ) { |
60 | const touch = touchEvent.changedTouches.item ( ZERO ); |
61 | this.#touchContainerStartY = touch.screenY; |
62 | } |
63 | break; |
64 | case 'touchmove' : |
65 | case 'touchend' : |
66 | if ( ONE === touchEvent.changedTouches.length ) { |
67 | const touch = touchEvent.changedTouches.item ( ZERO ); |
68 | const deltaY = this.#touchContainerStartY - touch.screenY; |
69 | touchEvent.currentTarget.scrollTop += deltaY; |
70 | this.#touchContainerStartY = touch.screenY; |
71 | } |
72 | break; |
73 | default : |
74 | this.#touchContainerStartY = Number.MAX_VALUE; |
75 | break; |
76 | } |
77 | if ( 'touchend' === touchEvent.type ) { |
78 | this.#touchContainerStartY = Number.MAX_VALUE; |
79 | } |
80 | } |
81 | } |
82 | |
83 | export default ButtonsHTMLElementTouchEL; |
84 | |
85 | /* --- End of file --------------------------------------------------------------------------------------------------------- */ |
86 |