const EventEmitter = require('events') const $ = require('../lib/chibi') const { mk, qs } = require('../utils') const notify = require('../notif') const ScreenParser = require('./screen_parser') const ScreenRenderer = require('./screen_renderer') module.exports = class TermScreen extends EventEmitter { constructor () { super() this.canvas = mk('canvas') this.ctx = this.canvas.getContext('2d') this.parser = new ScreenParser(this) this.renderer = new ScreenRenderer(this) // 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!') } // dummy. Handle for Input this.input = new Proxy({}, { get () { return () => console.warn('TermScreen#input not set!') } }) this.cursor = { x: 0, y: 0, blinking: true, visible: true, hanging: false, style: 'block' } this._window = { width: 0, height: 0, devicePixelRatio: 1, fontFamily: '"DejaVu Sans Mono", "Liberation Mono", "Inconsolata", "Menlo", monospace', fontSize: 20, gridScaleX: 1.0, gridScaleY: 1.2, fitIntoWidth: 0, fitIntoHeight: 0, debug: false, graphics: 0, statusScreen: null } // scaling caused by fitIntoWidth/fitIntoHeight this._windowScale = 1 // properties of this.window that require updating size and redrawing this.windowState = { width: 0, height: 0, devicePixelRatio: 0, gridScaleX: 0, gridScaleY: 0, fontFamily: '', fontSize: 0, fitIntoWidth: 0, fitIntoHeight: 0 } // current selection this.selection = { // when false, this will prevent selection in favor of mouse events, // though alt can be held to override it selectable: true, // selection start and end (x, y) tuples start: [0, 0], end: [0, 0] } // mouse features this.mouseMode = { clicks: false, movement: false } // make writing to window update size and draw const self = this this.window = new Proxy(this._window, { set (target, key, value, receiver) { target[key] = value self.scheduleSizeUpdate() self.renderer.scheduleDraw(`window:${key}=${value}`) self.emit(`update-window:${key}`, value) return true } }) 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.screenToGrid(x, y, true) this.renderer.scheduleDraw('select-start') } let selectMove = (x, y) => { if (!selecting) return this.selection.end = this.screenToGrid(x, y, true) this.renderer.scheduleDraw('select-move') } let selectEnd = (x, y) => { if (!selecting) return selecting = false this.selection.end = this.screenToGrid(x, y, true) this.renderer.scheduleDraw('select-end') Object.assign(this.selection, this.getNormalizedSelection()) } // bind event listeners this.canvas.addEventListener('mousedown', e => { if ((this.selection.selectable || e.altKey) && e.button === 0) { selectStart(e.offsetX, e.offsetY) } else { this.input.onMouseDown(...this.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] } this.canvas.addEventListener('touchstart', e => { touchPosition = getTouchPositionOffset(e.touches[0]) touchDidMove = false touchDownTime = Date.now() }) this.canvas.addEventListener('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 }) this.canvas.addEventListener('touchend', e => { if (e.touches[0]) { touchPosition = getTouchPositionOffset(e.touches[0]) } if (selecting) { e.preventDefault() selectEnd(...touchPosition) // selection ended; show touch select menu let touchSelectMenu = qs('#touch-select-menu') touchSelectMenu.classList.add('open') let rect = touchSelectMenu.getBoundingClientRect() // use middle position for x and one line above for y let selectionPos = this.gridToScreen( (this.selection.start[0] + this.selection.end[0]) / 2, this.selection.start[1] - 1 ) selectionPos[0] -= rect.width / 2 selectionPos[1] -= rect.height / 2 touchSelectMenu.style.transform = `translate(${selectionPos[0]}px, ${ selectionPos[1]}px)` } if (!touchDidMove) { 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] qs('#touch-select-menu').classList.remove('open') this.renderer.scheduleDraw('select-reset') } else { e.preventDefault() this.emit('open-soft-keyboard') } }) $.ready(() => { let copyButton = qs('#touch-select-copy-btn') if (copyButton) { copyButton.addEventListener('click', () => { this.copySelectionToClipboard() }) } }) this.canvas.addEventListener('mousemove', e => { if (!selecting) { this.input.onMouseMove(...this.screenToGrid(e.offsetX, e.offsetY)) } }) this.canvas.addEventListener('mouseup', e => { if (!selecting) { this.input.onMouseUp(...this.screenToGrid(e.offsetX, e.offsetY), e.button + 1) } }) this.canvas.addEventListener('wheel', e => { if (this.mouseMode.clicks) { this.input.onMouseWheel(...this.screenToGrid(e.offsetX, e.offsetY), e.deltaY > 0 ? 1 : -1) // prevent page scrolling e.preventDefault() } }) this.canvas.addEventListener('contextmenu', e => { if (this.mouseMode.clicks) { // prevent mouse keys getting stuck e.preventDefault() } selectEnd(e.offsetX, e.offsetY) }) } /** * Schedule a size update in the next millisecond */ scheduleSizeUpdate () { clearTimeout(this._scheduledSizeUpdate) this._scheduledSizeUpdate = setTimeout(() => this.updateSize(), 1) } /** * Returns a CSS font string with this TermScreen's font settings and the * font modifiers. * @param {Object} modifiers * @param {string} [modifiers.style] - the font style * @param {string} [modifiers.weight] - the font weight * @returns {string} a CSS font string */ getFont (modifiers = {}) { let fontStyle = modifiers.style || 'normal' let fontWeight = modifiers.weight || 'normal' return `${fontStyle} normal ${fontWeight} ${this.window.fontSize}px ${this.window.fontFamily}` } /** * Converts screen coordinates to grid coordinates. * @param {number} x - x in pixels * @param {number} y - y in pixels * @param {boolean} rounded - whether to round the coord, used for select highlighting * @returns {number[]} a tuple of (x, y) in cells */ screenToGrid (x, y, rounded = false) { let cellSize = this.getCellSize() return [ Math.floor((x + (rounded ? cellSize.width / 2 : 0)) / cellSize.width), Math.floor(y / cellSize.height) ] } /** * Converts grid coordinates to screen coordinates. * @param {number} x - x in cells * @param {number} y - y in cells * @param {boolean} [withScale] - when true, will apply window scale * @returns {number[]} a tuple of (x, y) in pixels */ gridToScreen (x, y, withScale = false) { let cellSize = this.getCellSize() return [x * cellSize.width, y * cellSize.height].map(v => withScale ? v * this._windowScale : v) } /** * The character size, used for calculating the cell size. The space character * is used for measuring. * @returns {Object} the character size with `width` and `height` in pixels */ getCharSize () { this.ctx.font = this.getFont() return { width: Math.floor(this.ctx.measureText(' ').width), height: this.window.fontSize } } /** * The cell size, which is the character size multiplied by the grid scale. * @returns {Object} the cell size with `width` and `height` in pixels */ getCellSize () { let charSize = this.getCharSize() return { width: Math.ceil(charSize.width * this.window.gridScaleX), height: Math.ceil(charSize.height * this.window.gridScaleY) } } /** * Updates the canvas size if it changed */ updateSize () { // see below (this is just updating it) this._window.devicePixelRatio = Math.round(this._windowScale * (window.devicePixelRatio || 1) * 2) / 2 let didChange = false for (let key in this.windowState) { if (this.windowState.hasOwnProperty(key) && this.windowState[key] !== this.window[key]) { didChange = true this.windowState[key] = this.window[key] } } if (didChange) { const { width, height, fitIntoWidth, fitIntoHeight } = this.window const cellSize = this.getCellSize() // real height of the canvas element in pixels let realWidth = width * cellSize.width let realHeight = height * cellSize.height if (fitIntoWidth && fitIntoHeight) { let terminalAspect = realWidth / realHeight let fitAspect = fitIntoWidth / fitIntoHeight if (terminalAspect < fitAspect) { // align heights realHeight = fitIntoHeight realWidth = realHeight * terminalAspect } else { // align widths realWidth = fitIntoWidth realHeight = realWidth / terminalAspect } } else if (fitIntoWidth) { realHeight = fitIntoWidth / (realWidth / realHeight) realWidth = fitIntoWidth } else if (fitIntoHeight) { realWidth = fitIntoHeight * (realWidth / realHeight) realHeight = fitIntoHeight } // store new window scale this._windowScale = realWidth / (width * cellSize.width) // the DPR must be rounded to a very nice value to prevent gaps between cells let devicePixelRatio = this._window.devicePixelRatio = Math.round(this._windowScale * (window.devicePixelRatio || 1) * 2) / 2 this.canvas.width = width * devicePixelRatio * cellSize.width this.canvas.style.width = `${realWidth}px` this.canvas.height = height * devicePixelRatio * cellSize.height this.canvas.style.height = `${realHeight}px` // the screen has been cleared (by changing canvas width) this.renderer.resetDrawn() // draw immediately; the canvas shouldn't flash this.renderer.draw('update-size') } } /** * 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) { this.parser.load(...args) } }