ESPTerm web interface submodule, separated to make testing and development easier
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espterm-front-end/js/term/buttons.js

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const { qs } = require('../utils')
module.exports = function initButtons (input) {
let container = qs('#action-buttons')
// button labels
let labels = []
// button elements
let buttons = []
// add a button element
let pushButton = function pushButton () {
let button = document.createElement('button')
button.classList.add('action-button')
button.setAttribute('data-n', buttons.length)
buttons.push(button)
container.appendChild(button)
button.addEventListener('click', e => {
// might as well use the attribute ¯\_(ツ)_/¯
let index = +button.getAttribute('data-n')
input.sendButton(index)
e.target.blur() // if it keeps focus, spacebar will push it
})
// this prevents button retaining focus after half-click/drag-away
button.addEventListener('mouseleave', e => {
e.target.blur()
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})
return button
}
// remove a button element
let popButton = function popButton () {
let button = buttons.pop()
button.parentNode.removeChild(button)
}
// sync with DOM
let update = function updateButtons () {
if (labels.length > buttons.length) {
for (let i = buttons.length; i < labels.length; i++) {
pushButton()
}
} else if (buttons.length > labels.length) {
for (let i = labels.length; i <= buttons.length; i++) {
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popButton()
}
}
for (let i = 0; i < labels.length; i++) {
let label = labels[i].trim()
let button = buttons[i]
button.textContent = label || '\u00a0' // label or nbsp
if (!label) button.classList.add('inactive')
else button.classList.remove('inactive')
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}
}
return { update, labels }
}