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

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16 KiB

const EventEmitter = require('events')
const { mk } = require('../utils')
const notify = require('../notif')
const ScreenParser = require('./screen_parser')
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const ScreenLayout = require('./screen_layout')
const { ATTR_BLINK } = require('./screen_attr_bits')
/**
* A terminal screen.
*/
module.exports = class TermScreen extends EventEmitter {
constructor () {
super()
this.parser = new ScreenParser()
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this.layout = new ScreenLayout()
// debug screen handle
this._debug = null
if ('AudioContext' in window || 'webkitAudioContext' in window) {
this.audioCtx = new (window.AudioContext || window.webkitAudioContext)()
} else {
console.warn('No AudioContext!')
}
this._window = {
width: 0,
height: 0,
// two bits. LSB: debug enabled by user, MSB: debug enabled by server
debug: 0,
statusScreen: null
}
// make writing to window update size and draw
this.window = new Proxy(this._window, {
set (target, key, value) {
if (target[key] !== value) {
target[key] = value
self.updateLayout()
self.emit(`update-window:${key}`, value)
}
return true
}
})
this.on('update-window:debug', debug => { this.layout.window.debug = !!debug })
this.cursor = {
x: 0,
y: 0,
blinking: true,
visible: true,
hanging: false,
style: 'block'
}
const self = this
// current selection
this.selection = {
// when false, this will prevent selection in favor of mouse events,
// though alt can be held to override it
selectable: null,
// selection start and end (x, y) tuples
start: [0, 0],
end: [0, 0],
setSelectable (value) {
if (value !== this.selectable) {
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this.selectable = self.layout.selectable = value
}
}
}
// mouse features
this.mouseMode = { clicks: false, movement: false }
this.bracketedPaste = false
this.blinkingCellCount = 0
this.reverseVideo = false
this.screen = []
this.screenFG = []
this.screenBG = []
this.screenAttrs = []
let selecting = false
let selectStart = (x, y) => {
if (selecting) return
selecting = true
this.selection.start = this.selection.end = this.layout.screenToGrid(x, y, true)
this.renderScreen('select-start')
}
let selectMove = (x, y) => {
if (!selecting) return
this.selection.end = this.layout.screenToGrid(x, y, true)
this.renderScreen('select-move')
}
let selectEnd = (x, y) => {
if (!selecting) return
selecting = false
this.selection.end = this.layout.screenToGrid(x, y, true)
this.renderScreen('select-end')
Object.assign(this.selection, this.getNormalizedSelection())
}
// bind event listeners
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this.layout.on('mousedown', e => {
this.emit('hide-touch-select-menu')
if ((this.selection.selectable || e.altKey) && e.button === 0) {
selectStart(e.offsetX, e.offsetY)
} else {
this.emit('mousedown', ...this.layout.screenToGrid(e.offsetX, e.offsetY), e.button + 1)
}
})
window.addEventListener('mousemove', e => {
selectMove(e.offsetX, e.offsetY)
})
window.addEventListener('mouseup', e => {
selectEnd(e.offsetX, e.offsetY)
})
// touch event listeners
let touchPosition = null
let touchDownTime = 0
let touchSelectMinTime = 500
let touchDidMove = false
let getTouchPositionOffset = touch => {
let rect = this.canvas.getBoundingClientRect()
return [touch.clientX - rect.left, touch.clientY - rect.top]
}
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this.layout.on('touchstart', e => {
touchPosition = getTouchPositionOffset(e.touches[0])
touchDidMove = false
touchDownTime = Date.now()
}, { passive: true })
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this.layout.on('touchmove', e => {
touchPosition = getTouchPositionOffset(e.touches[0])
if (!selecting && touchDidMove === false) {
if (touchDownTime < Date.now() - touchSelectMinTime) {
selectStart(...touchPosition)
}
} else if (selecting) {
e.preventDefault()
selectMove(...touchPosition)
}
touchDidMove = true
})
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this.layout.on('touchend', e => {
if (e.touches[0]) {
touchPosition = getTouchPositionOffset(e.touches[0])
}
if (selecting) {
e.preventDefault()
selectEnd(...touchPosition)
// selection ended; show touch select menu
// use middle position for x and one line above for y
let selectionPos = this.layout.gridToScreen(
(this.selection.start[0] + this.selection.end[0]) / 2,
this.selection.start[1] - 1
)
this.emit('show-touch-select-menu', selectionPos[0], selectionPos[1])
}
if (!touchDidMove && !this.mouseMode.clicks) {
this.emit('tap', Object.assign(e, {
x: touchPosition[0],
y: touchPosition[1]
}))
}
touchPosition = null
})
this.on('tap', e => {
if (this.selection.start[0] !== this.selection.end[0] ||
this.selection.start[1] !== this.selection.end[1]) {
// selection is not empty
// reset selection
this.selection.start = this.selection.end = [0, 0]
this.emit('hide-touch-select-menu')
this.renderScreen('select-reset')
} else {
e.preventDefault()
this.emit('open-soft-keyboard')
}
})
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this.layout.on('mousemove', e => {
if (!selecting) {
this.emit('mousemove', ...this.layout.screenToGrid(e.offsetX, e.offsetY))
}
})
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this.layout.on('mouseup', e => {
if (!selecting) {
this.emit('mouseup', ...this.layout.screenToGrid(e.offsetX, e.offsetY),
e.button + 1)
}
})
let aggregateWheelDelta = 0
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this.layout.on('wheel', e => {
if (this.mouseMode.clicks) {
if (Math.abs(e.wheelDeltaY) === 120) {
// mouse wheel scrolling
this.emit('mousewheel', ...this.layout.screenToGrid(e.offsetX, e.offsetY), e.deltaY > 0 ? 1 : -1)
} else {
// smooth scrolling
aggregateWheelDelta -= e.wheelDeltaY
if (Math.abs(aggregateWheelDelta) >= 40) {
this.emit('mousewheel', ...this.layout.screenToGrid(e.offsetX, e.offsetY), aggregateWheelDelta > 0 ? 1 : -1)
aggregateWheelDelta = 0
}
}
// prevent page scrolling
e.preventDefault()
}
})
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this.layout.on('contextmenu', e => {
if (this.mouseMode.clicks) {
// prevent mouse keys getting stuck
e.preventDefault()
}
selectEnd(e.offsetX, e.offsetY)
})
}
resetScreen () {
const { width, height } = this.window
this.blinkingCellCount = 0
this.screen.screen = new Array(width * height).fill(' ')
this.screen.screenFG = new Array(width * height).fill(0)
this.screen.screenBG = new Array(width * height).fill(0)
this.screen.screenAttrs = new Array(width * height).fill(0)
}
updateLayout () {
this.layout.window.width = this.window.width
this.layout.window.height = this.window.height
}
renderScreen (reason) {
let selection = []
for (let cell = 0; cell < this.screen.length; cell++) {
selection.push(this.isInSelection(cell % this.window.width, Math.floor(cell / this.window.width)))
}
this.layout.render(reason, {
width: this.window.width,
height: this.window.height,
screen: this.screen,
screenFG: this.screenFG,
screenBG: this.screenBG,
screenSelection: selection,
screenAttrs: this.screenAttrs,
cursor: this.cursor,
statusScreen: this.window.statusScreen,
hasBlinkingCells: !!this.blinkingCellCount
})
}
/**
* Returns a normalized version of the current selection, such that `start`
* is always before `end`.
* @returns {Object} the normalized selection, with `start` and `end`
*/
getNormalizedSelection () {
let { start, end } = this.selection
// if the start line is after the end line, or if they're both on the same
// line but the start column comes after the end column, swap
if (start[1] > end[1] || (start[1] === end[1] && start[0] > end[0])) {
[start, end] = [end, start]
}
return { start, end }
}
/**
* Returns whether or not a given cell is in the current selection.
* @param {number} col - the column (x)
* @param {number} line - the line (y)
* @returns {boolean}
*/
isInSelection (col, line) {
let { start, end } = this.getNormalizedSelection()
let colAfterStart = start[0] <= col
let colBeforeEnd = col < end[0]
let onStartLine = line === start[1]
let onEndLine = line === end[1]
if (onStartLine && onEndLine) return colAfterStart && colBeforeEnd
else if (onStartLine) return colAfterStart
else if (onEndLine) return colBeforeEnd
else return start[1] < line && line < end[1]
}
/**
* Sweeps for selected cells and joins them in a multiline string.
* @returns {string} the selection
*/
getSelectedText () {
const screenLength = this.window.width * this.window.height
let lines = []
let previousLineIndex = -1
for (let cell = 0; cell < screenLength; cell++) {
let x = cell % this.window.width
let y = Math.floor(cell / this.window.width)
if (this.isInSelection(x, y)) {
if (previousLineIndex !== y) {
previousLineIndex = y
lines.push('')
}
lines[lines.length - 1] += this.screen[cell]
}
}
return lines.join('\n')
}
/**
* Copies the selection to clipboard and creates a notification balloon.
*/
copySelectionToClipboard () {
let selectedText = this.getSelectedText()
// don't copy anything if nothing is selected
if (!selectedText) return
let textarea = mk('textarea')
document.body.appendChild(textarea)
textarea.value = selectedText
textarea.select()
if (document.execCommand('copy')) {
notify.show('Copied to clipboard')
} else {
notify.show('Failed to copy')
}
document.body.removeChild(textarea)
}
/**
* Shows an actual notification (if possible) or a notification balloon.
* @param {string} text - the notification content
*/
showNotification (text) {
console.info(`Notification: ${text}`)
if (window.Notification && window.Notification.permission === 'granted') {
let notification = new window.Notification('ESPTerm', {
body: text
})
notification.addEventListener('click', () => window.focus())
} else {
if (window.Notification && window.Notification.permission !== 'denied') {
window.Notification.requestPermission()
} else {
// Fallback using the built-in notification balloon
notify.show(text)
}
}
}
/**
* Creates a beep sound.
*/
beep () {
const audioCtx = this.audioCtx
if (!audioCtx) return
// prevent screeching
if (this._lastBeep && this._lastBeep > Date.now() - 50) return
this._lastBeep = Date.now()
if (!this._convolver) {
this._convolver = audioCtx.createConvolver()
let impulseLength = audioCtx.sampleRate * 0.8
let impulse = audioCtx.createBuffer(2, impulseLength, audioCtx.sampleRate)
for (let i = 0; i < impulseLength; i++) {
impulse.getChannelData(0)[i] = (1 - i / impulseLength) ** (7 + Math.random())
impulse.getChannelData(1)[i] = (1 - i / impulseLength) ** (7 + Math.random())
}
this._convolver.buffer = impulse
this._convolver.connect(audioCtx.destination)
}
// main beep
const mainOsc = audioCtx.createOscillator()
const mainGain = audioCtx.createGain()
mainOsc.connect(mainGain)
mainGain.gain.value = 4
mainOsc.frequency.value = 750
mainOsc.type = 'sine'
// surrogate beep (making it sound like 'oops')
const surrOsc = audioCtx.createOscillator()
const surrGain = audioCtx.createGain()
surrOsc.connect(surrGain)
surrGain.gain.value = 2
surrOsc.frequency.value = 400
surrOsc.type = 'sine'
mainGain.connect(this._convolver)
surrGain.connect(this._convolver)
let startTime = audioCtx.currentTime
mainOsc.start()
mainOsc.stop(startTime + 0.5)
surrOsc.start(startTime + 0.05)
surrOsc.stop(startTime + 0.8)
let loop = function () {
if (audioCtx.currentTime < startTime + 0.8) window.requestAnimationFrame(loop)
mainGain.gain.value *= 0.8
surrGain.gain.value *= 0.8
}
loop()
}
load (...args) {
const updates = this.parser.parse(...args)
for (let update of updates) {
switch (update.topic) {
case 'screen-opts':
if (update.width !== this.window.width || update.height !== this.window.height) {
this.window.width = update.width
this.window.height = update.height
this.resetScreen()
}
this.layout.renderer.loadTheme(update.theme)
this.layout.renderer.setDefaultColors(update.defFG, update.defBG)
this.cursor.visible = update.cursorVisible
this.emit('input-alts', ...update.inputAlts)
this.mouseMode.clicks = update.trackMouseClicks
this.mouseMode.movement = update.trackMouseMovement
this.emit('mouse-mode', update.trackMouseClicks, update.trackMouseMovement)
this.selection.setSelectable(!update.trackMouseClicks && !update.trackMouseMovement)
if (this.cursor.blinking !== update.cursorBlinking) {
this.cursor.blinking = update.cursorBlinking
this.layout.renderer.resetCursorBlink()
}
this.cursor.style = update.cursorStyle
this.bracketedPaste = update.bracketedPaste
this.reverseVideo = update.reverseVideo
this.window.debug &= 0b01
this.window.debug |= (+update.debugEnabled << 1)
this.emit('TEMP:show-buttons', update.showButtons)
this.emit('TEMP:show-links', update.showConfigLinks)
break
case 'cursor':
if (this.cursor.x !== update.x || this.cursor.y !== update.y || this.cursor.hanging !== update.hanging) {
this.cursor.x = update.x
this.cursor.y = update.y
this.cursor.hanging = update.hanging
this.layout.renderer.resetCursorBlink()
this.emit('cursor-moved')
this.renderScreen('cursor-moved')
}
break
case 'title':
this.emit('TEMP:update-title', update.title)
break
case 'button-labels':
this.emit('button-labels', update.labels)
break
case 'backdrop':
this.backgroundImage = update.image
break
case 'bell':
this.beep()
break
case 'internal':
this.emit('internal', update)
break
case 'content':
const { frameX, frameY, frameWidth, frameHeight, cells } = update
if (this._debug && this.window.debug) {
this._debug.pushFrame([frameX, frameY, frameWidth, frameHeight])
}
for (let cell = 0; cell < cells.length; cell++) {
let data = cells[cell]
let cellXInFrame = cell % frameWidth
let cellYInFrame = Math.floor(cell / frameWidth)
let index = (frameY + cellYInFrame) * this.window.width + frameX + cellXInFrame
if ((this.screenAttrs[index] & ATTR_BLINK) !== (data[3] & ATTR_BLINK)) {
if (data[3] & ATTR_BLINK) this.blinkingCellCount++
else this.blinkingCellCount--
}
this.screen[index] = data[0]
this.screenFG[index] = data[1]
this.screenBG[index] = data[2]
this.screenAttrs[index] = data[3]
}
if (this.window.debug) console.log(`Blinking cells: ${this.blinkingCellCount}`)
this.renderScreen('load')
this.emit('load')
break
case 'full-load-complete':
this.emit('TEMP:hide-load-failed-msg')
break
case 'notification':
this.showNotification(update.content)
break
default:
console.warn('Unhandled update', update)
}
}
}
}