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letterboard.ts
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letterboard.ts
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/*
Letterboard
A simple On Screen keyboard designed for use in Chrome Kiosk mode
Please lmk of any bugs / features if you plan on using it.
John Sakoutis ([email protected])
Github: RoundsToThree
Available as Open Source Software (With attribution please if you use it)
July 21st, 2023
*/
interface LetterBoardConfig {
x: string,
y: string,
w: string,
h: string,
layout: LetterBoardLayout,
}
interface LetterBoardLayout {
'standard': string[][],
'uppercase': string[][],
}
const qwertyLayout: LetterBoardLayout = {
standard: [
['`', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', '⌫'],
['q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']'],
['a', 's', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'l', ';', '"'],
['⇧', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', '␣'],
],
uppercase: [
['~', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', '⌫'],
['Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '[', ']'],
['A', 'S', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', ';', '"'],
['⇧', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', '␣'],
]
};
let lb_osk: HTMLDivElement;
let lb_osk_target: Element;
let lb_osk_clickTarget: Element;
let lb_osk_config: LetterBoardConfig;
const defaultLBConfig = {
x: 'auto',
y: 'auto',
w: '80vw',
h: '70vh',
layout: qwertyLayout,
raiseSelected: true,
};
/**
* Opens the On Screen Keyboard
* @param {Element} element the element that intended on oepning the OSK
* @param {LetterBoardConfig} config The config to apply to the OSK
*/
function openOSK(element: Element, config: LetterBoardConfig = defaultLBConfig) {
// Close existing OSK
if (lb_osk != null) {
lb_osk.remove();
lb_osk_target.classList.remove('letterBoard-selected');
}
// bring the selected item to the top
lb_osk_target = element;
lb_osk_target.classList.add('letterBoard-selected');
// Set the config
lb_osk_config = config;
lb_osk = generateKeyboard();
// Set position and dimension
config.w = lb_osk.style.width = config.w === 'auto' ? defaultLBConfig.w : config.w;
config.h = lb_osk.style.height = config.h === 'auto' ? defaultLBConfig.h : config.h;
if (config.x == 'auto')
lb_osk.style.setProperty('left', `calc(${window.innerWidth / 2}px - ${config.w}/2)`);
if (config.y == 'auto')
lb_osk.style.setProperty('top', `calc(${window.innerHeight / 2}px - ${config.h}/2)`);
document.body.appendChild(lb_osk);
const clickTarget = document.createElement('div');
clickTarget.classList.add('letterBoard-clickTarget');
clickTarget.addEventListener('click', closeOSKEvent);
lb_osk_clickTarget = clickTarget;
document.body.appendChild(clickTarget);
}
/**
* Closes the On Screen Keyboard
*/
function closeOSKEvent() {
lb_osk_clickTarget.remove();
if (lb_osk != null) {
lb_osk.remove();
lb_osk_target.classList.remove('letterBoard-selected');
}
}
/**
* Fired when the letterboard is clicked to modify the selected field
* @param {MouseEvent} event Event from container's onclick
*/
function letterboardClicked(event: MouseEvent) {
const selectedKey: EventTarget | null = event.target;
if (selectedKey instanceof Element && selectedKey.textContent) {
let selected: string = selectedKey.textContent;
switch (selected) {
case '⇧':
// Toggle case
selectedKey.classList.toggle('letterBoard-letterHold');
letterboardToggleCase();
return;
case '␣':
selected = ' ';
break;
case '⌫':
if (lb_osk_target instanceof HTMLInputElement && lb_osk_target.value.length > 0)
lb_osk_target.value = lb_osk_target.value.substring(0, lb_osk_target.value.length - 1);
else if (lb_osk_target.textContent && lb_osk_target.textContent.length > 0)
lb_osk_target.textContent = lb_osk_target.textContent.substring(0, lb_osk_target.textContent.length - 1);
return;
case 'Complete':
closeOSKEvent();
return;
}
// Ignore not clicking on any specific letter
if (!selectedKey.classList.contains('letterBoard-letter'))
return;
if (lb_osk_target instanceof HTMLInputElement)
lb_osk_target.value += selected;
else
lb_osk_target.textContent += selected;
}
}
/**
* Generates the elements for the keyboard
* @returns {HTMLDivElement} The keyboard container
*/
function generateKeyboard(): HTMLDivElement {
let container: HTMLDivElement = document.createElement('div');
container.classList.add('letterBoard-container');
container.addEventListener('click', letterboardClicked);
container.setAttribute('type', 'standard');
// Add letters to container
lb_osk_config.layout.standard.forEach((row) => {
let flex: HTMLDivElement = document.createElement('div');
flex.classList.add('letterBoard-row');
row.forEach((char) => {
let letter = document.createElement('span');
letter.classList.add('letterBoard-letter');
letter.textContent = char;
flex.appendChild(letter);
})
container.appendChild(flex);
})
let ok: HTMLSpanElement = document.createElement('span');
ok.classList.add('letterBoard-complete');
ok.textContent = 'Complete';
container.appendChild(ok);
return container;
}
/**
* Toggles the case of the letterboard
*/
function letterboardToggleCase() {
const isStandard: boolean = !(lb_osk.getAttribute('type') === 'standard');
lb_osk.setAttribute('type', isStandard ? 'standard' : 'uppercase');
// Change letters in container
const divs: NodeListOf<HTMLDivElement> = lb_osk.querySelectorAll('div');
for (let r = 0; r < divs.length; ++r) {
const letters: NodeListOf<HTMLSpanElement> = divs[r].querySelectorAll('span');
for (let c = 0; c < letters.length; ++c) {
letters[c].textContent = (isStandard ?
lb_osk_config.layout.standard :
lb_osk_config.layout.uppercase
)[r][c];
}
}
}