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

110 lines
3.2 KiB

window.initSoftKeyboard = function (screen, input) {
const keyInput = qs('#softkb-input')
if (!keyInput) return // abort, we're not on the terminal page
let keyboardOpen = false
// moves the input to where the cursor is on the canvas.
// this is because most browsers will always scroll to wherever the focused
// input is
let updateInputPosition = function () {
if (!keyboardOpen) return
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let [x, y] = screen.gridToScreen(screen.cursor.x, screen.cursor.y, true)
keyInput.style.transform = `translate(${x}px, ${y}px)`
}
keyInput.addEventListener('focus', () => {
keyboardOpen = true
updateInputPosition()
})
keyInput.addEventListener('blur', () => (keyboardOpen = false))
screen.on('cursor-moved', updateInputPosition)
qs('#term-kb-open').addEventListener('click', e => {
e.preventDefault()
keyInput.focus()
})
// Chrome for Android doesn't send proper keydown/keypress events with
// real key values instead of 229 “Unidentified,” so here's a workaround
// that deals with the input composition events.
let lastCompositionString = ''
let compositing = false
// sends the difference between the last and the new composition string
let sendInputDelta = function (newValue) {
let resend = false
if (newValue.length > lastCompositionString.length) {
if (newValue.startsWith(lastCompositionString)) {
// characters have been added at the end
input.sendString(newValue.substr(lastCompositionString.length))
} else resend = true
} else if (newValue.length < lastCompositionString.length) {
if (lastCompositionString.startsWith(newValue)) {
// characters have been removed at the end
input.sendString('\b'.repeat(lastCompositionString.length -
newValue.length))
} else resend = true
} else if (newValue !== lastCompositionString) resend = true
if (resend) {
// the entire string changed; resend everything
input.sendString('\b'.repeat(lastCompositionString.length) +
newValue)
}
lastCompositionString = newValue
}
keyInput.addEventListener('keydown', e => {
if (e.key === 'Unidentified') return
keyInput.value = ''
if (e.key === 'Backspace') {
e.preventDefault()
input.sendString('\b')
} else if (e.key === 'Enter') {
e.preventDefault()
input.sendString('\x0d')
}
})
keyInput.addEventListener('keypress', e => {
// prevent key duplication on iOS (because Safari *does* send proper events)
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e.stopPropagation()
})
keyInput.addEventListener('input', e => {
e.stopPropagation()
if (e.isComposing) {
sendInputDelta(e.data)
} else {
if (e.inputType === 'insertCompositionText') input.sendString(e.data)
else if (e.inputType === 'deleteContentBackward') {
lastCompositionString = ''
sendInputDelta('')
} else if (e.inputType === 'insertText') {
input.sendString(e.data)
}
}
})
keyInput.addEventListener('compositionstart', e => {
lastCompositionString = ''
compositing = true
})
keyInput.addEventListener('compositionend', e => {
lastCompositionString = ''
compositing = false
keyInput.value = ''
})
screen.on('open-soft-keyboard', () => keyInput.focus())
}