901 lines
23 KiB
JavaScript
901 lines
23 KiB
JavaScript
//
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// TTY Emulation
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//
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// Usage:
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//
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// tty = new TTY( screen_element, keyboard_element );
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// tty.clearScreen()
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// tty.clearEOL()
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// tty.clearEOS()
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// tty.cursorLeft()
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// tty.cursorRight()
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// tty.cursorUp()
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// tty.cursorDown()
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// tty.scrollScreen()
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// tty.setTextStyle( textStyle )
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// { width: w, height: h } = tty.getScreenSize()
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// { x: x, y: y } = tty.getCursorPosition()
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// tty.setFirmwareActive( bool )
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// tty.setCursorPosition( x, y )
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// tty.showCursor()
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// tty.hideCursor()
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// tty.focus()
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//
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// This just calls writeChar() in a loop; no need to hook it
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// tty.writeString( string )
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//
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// The following can be hooked:
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// tty.readLine( callback_function, prompt )
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// tty.readChar( callback_function )
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// tty.writeChar( c )
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//
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// tty.TEXT_STYLE_NORMAL = 0
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// tty.TEXT_STYLE_INVERSE = 1
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// tty.TEXT_STYLE_FLASH = 2
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function TTY(screenElement, keyboardElement) {
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// Constants
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this.TEXT_STYLE_NORMAL = 0;
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this.TEXT_STYLE_INVERSE = 1;
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this.TEXT_STYLE_FLASH = 2;
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// Internal Fields
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// For references to "this" within callbacks and closures
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var self = this,
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// Display
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cursorX = 0,
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cursorY = 0,
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cursorVisible = false,
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cursorElement = null,
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styleElem,
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screenGrid,
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screenRow = [],
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splitPos = 0,
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screenWidth,
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screenHeight,
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curStyle = this.TEXT_STYLE_NORMAL,
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cursorState = true,
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cursorInterval,
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firmwareActive = true, // 80-column firmware
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mousetext = false,
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// Input
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lineCallback,
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charCallback,
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inputBuffer = [],
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keyboardRegister = 0,
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keyDown = false,
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capsLock = true, // Caps lock state is tracked unique to the TTY
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buttonState = [0, 0, 0, 0];
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this.autoScroll = true;
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//
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// Display
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//
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function setCellByte(x, y, byte) {
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var cell = screenGrid[x + screenWidth * y];
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if (cell && cell.byte !== byte) {
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cell.byte = byte;
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cell.elem.className = 'jsb-chr jsb-chr' + String(byte);
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}
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}
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// Apple II Character Generator (byte->character map)
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// 0x00-0x1F = INVERSE @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
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// 0x20-0x3F = INVERSE !"#$%&'()*+,-./0123456789:;<=>?
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// 0x40-0x5F = FLASH @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_ (80-col firmware active: mousetext symbols)
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// 0x60-0x7F = FLASH !"#$%&'()*+,-./0123456789:;<=>? (80-col firmware active: inverse lowercase)
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// 0x80-0x9F = NORMAL @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
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// 0xA0-0xBF = NORMAL !"#$%&'()*+,-./0123456789:;<=>?
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// 0xC0-0xDF = NORMAL @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
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// 0xE0-0xFF = NORMAL `abcdefghijklmnopqrstuvwxyz{|}~
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function setCellChar(x, y, c) {
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var byte;
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if (c > 0xff) {
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// Extension characters
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byte = c;
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} else {
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// Lock to 7-bit; Control characters should be filtered already
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c = (c >>> 0) & 0x7f;
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if (firmwareActive) {
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if (curStyle === self.TEXT_STYLE_INVERSE) {
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if (0x20 <= c && c < 0x40) { byte = c; }
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else if (0x40 <= c && c < 0x60) { byte = c - (mousetext ? 0 : 0x40); }
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else if (0x60 <= c && c < 0x80) { byte = c; }
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} else if (curStyle === self.TEXT_STYLE_FLASH) {
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if (0x20 <= c && c < 0x40) { byte = c + 0x40; }
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else if (0x40 <= c && c < 0x60) { byte = c - 0x40; }
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else if (0x60 <= c && c < 0x80) { byte = c; }
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} else {
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if (0x20 <= c && c < 0x40) { byte = c + 0x80; }
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else if (0x40 <= c && c < 0x60) { byte = c + 0x80; }
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else if (0x60 <= c && c < 0x80) { byte = c + 0x80; }
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}
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} else {
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if (curStyle === self.TEXT_STYLE_INVERSE) {
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if (0x20 <= c && c < 0x40) { byte = c; }
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else if (0x40 <= c && c < 0x60) { byte = c - 0x40; }
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else if (0x60 <= c && c < 0x80) { byte = c - 0x40; } // no inverse lowercase
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} else if (curStyle === self.TEXT_STYLE_FLASH) {
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if (0x20 <= c && c < 0x40) { byte = c + 0x40; }
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else if (0x40 <= c && c < 0x60) { byte = c; }
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else if (0x60 <= c && c < 0x80) { byte = c; } // no lowercase flash
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} else {
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if (0x20 <= c && c < 0x40) { byte = c + 0x80; }
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else if (0x40 <= c && c < 0x60) { byte = c + 0x80; }
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else if (0x60 <= c && c < 0x80) { byte = c + 0x80; }
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}
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}
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}
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setCellByte(x, y, byte);
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}
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this.reset = function reset() {
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this.hideCursor();
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lineCallback = undefined;
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charCallback = undefined;
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inputBuffer = [];
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keyboardRegister = 0;
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buttonState = [0, 0, 0, 0];
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}; // reset
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function init(active, rows, columns) {
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firmwareActive = active;
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screenWidth = columns;
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screenHeight = rows;
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// Reset parameters
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self.textWindow = {};
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self.textWindow.left = 0;
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self.textWindow.top = 0;
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self.textWindow.width = screenWidth;
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self.textWindow.height = screenHeight;
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self.setTextStyle(self.TEXT_STYLE_NORMAL);
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// Build character cell grid
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var x, y, table, tbody, tr, td;
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screenGrid = [];
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screenGrid.length = screenWidth * screenHeight;
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table = document.createElement('table');
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tbody = document.createElement('tbody');
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styleElem = tbody;
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styleElem.classList.add(screenWidth === 40 ? 'jsb-40col' : 'jsb-80col');
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if (firmwareActive) { styleElem.classList.add('jsb-active'); }
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for (y = 0; y < screenHeight; y += 1) {
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tr = document.createElement('tr');
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tr.style.visibility = (y < splitPos) ? "hidden" : "";
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screenRow[y] = tr;
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for (x = 0; x < screenWidth; x += 1) {
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td = document.createElement('td');
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screenGrid[screenWidth * y + x] = {
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elem: td
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};
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tr.appendChild(td);
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}
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tbody.appendChild(tr);
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}
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table.appendChild(tbody);
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screenElement.innerHTML = "";
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screenElement.appendChild(table);
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self.clearScreen();
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// Create cursor
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cursorElement = document.createElement('span');
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cursorElement.className = 'jsb-chr jsb-chr-cursor jsb-chr255';
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self.setCursorPosition(0, 0);
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}
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this.clearScreen = function clearScreen() {
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var x, y;
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cursorX = self.textWindow.left;
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cursorY = self.textWindow.top;
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for (y = self.textWindow.top; y < self.textWindow.top + self.textWindow.height; y += 1) {
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for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
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setCellChar(x, y, 0x20);
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}
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}
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};
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this.clearEOL = function clearEOL() {
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var x;
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for (x = cursorX; x < self.textWindow.left + self.textWindow.width; x += 1) {
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setCellChar(x, cursorY, 0x20);
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}
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};
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// Clears from the cursor position to the end of the window
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this.clearEOS = function clearEOS() {
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var x, y;
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for (x = cursorX; x < self.textWindow.left + self.textWindow.width; x += 1) {
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setCellChar(x, cursorY, 0x20);
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}
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for (y = cursorY + 1; y < self.textWindow.top + self.textWindow.height; y += 1) {
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for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
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setCellChar(x, y, 0x20);
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}
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}
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};
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this.setFirmwareActive = function setFirmwareActive(active) {
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if (active !== firmwareActive)
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init(active, 24, active ? 80 : 40);
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};
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this.isFirmwareActive = function isFirmwareActive() {
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return firmwareActive;
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};
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this.isAltCharset = function isAltCharset() {
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return mousetext;
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};
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function scrollUp() {
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var x, y, cell;
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for (y = self.textWindow.top; y < self.textWindow.top + self.textWindow.height - 1; y += 1) {
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for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
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cell = screenGrid[x + screenWidth * (y + 1)];
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setCellByte(x, y, cell.byte);
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}
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}
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y = self.textWindow.top + (self.textWindow.height - 1);
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for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
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setCellChar(x, y, 0x20);
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}
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}
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function scrollDown() {
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var x, y, cell;
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for (y = self.textWindow.top + self.textWindow.height - 1; y > self.textWindow.top; y -= 1) {
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for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
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cell = screenGrid[x + screenWidth * (y - 1)];
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setCellByte(x, y, cell.byte);
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}
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}
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y = self.textWindow.top;
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for (x = self.textWindow.left; x < self.textWindow.left + self.textWindow.width; x += 1) {
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setCellChar(x, y, 0x20);
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}
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}
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this.scrollScreen = function scrollScreen() {
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scrollUp();
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};
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this.setTextStyle = function setTextStyle(style) {
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curStyle = style;
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};
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// Internal
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function updateCursor() {
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if (cursorVisible && cursorState) {
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var elem = screenGrid[cursorY * screenWidth + cursorX].elem;
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if (elem !== cursorElement.parentNode) {
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elem.appendChild(cursorElement);
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}
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} else if (cursorElement.parentNode) {
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cursorElement.parentNode.removeChild(cursorElement);
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}
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}
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this.cursorDown = function cursorDown() {
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cursorY += 1;
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if (cursorY >= self.textWindow.top + self.textWindow.height) {
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cursorY = self.textWindow.top + self.textWindow.height - 1;
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if (self.autoScroll) {
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self.scrollScreen();
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}
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}
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updateCursor();
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};
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this.cursorLeft = function cursorLeft() {
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cursorX -= 1;
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if (cursorX < self.textWindow.left) {
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cursorX += self.textWindow.width;
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cursorY -= 1;
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if (cursorY < self.textWindow.top) {
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cursorY = self.textWindow.top;
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}
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}
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updateCursor();
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};
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this.cursorUp = function cursorUp() {
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cursorY -= 1;
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if (cursorY < self.textWindow.top) {
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cursorY = self.textWindow.top;
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}
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updateCursor();
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};
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this.cursorRight = function cursorRight() {
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cursorX += 1;
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if (cursorX >= self.textWindow.left + self.textWindow.width) {
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cursorX = self.textWindow.left;
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self.cursorDown();
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}
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updateCursor();
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};
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// Hookable
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this.writeChar = function writeChar(c) {
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var code = c.charCodeAt(0),
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x, y;
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switch (code) {
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case 0:
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case 1:
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case 2:
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case 3:
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case 4: // DOS hook takes care of CHR$(4)
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case 5:
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case 6:
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case 7: // (BEL) bell - handled by index hook
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// no-op
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break;
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case 8: // (BS) backspace
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self.cursorLeft();
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break;
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case 9:
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break;
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case 10: // (LF) line feed
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self.cursorDown();
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break;
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case 11: // (VT) clear EOS
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if (firmwareActive) {
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self.clearEOS();
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}
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break;
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case 12: // (FF) clear
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if (firmwareActive) {
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// move cursor to upper left and clear window
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self.clearScreen();
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}
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break;
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case 13: // (CR) return
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cursorX = self.textWindow.left;
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self.cursorDown();
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break;
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case 14: // (SO) normal
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if (firmwareActive) {
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curStyle = self.TEXT_STYLE_NORMAL;
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}
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break;
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case 15: // (SI) inverse
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if (firmwareActive) {
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curStyle = self.TEXT_STYLE_INVERSE;
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}
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break;
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case 16:
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break;
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case 17: // (DC1) 40-column
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if (firmwareActive) {
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// set display to 40 columns
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init(true, 24, 40);
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}
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break;
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case 18: // (DC2) 80-column
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if (firmwareActive) {
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// set display to 80 columns
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init(true, 24, 80);
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}
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break;
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case 19: // (DC3) stop list
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case 20:
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break;
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case 21: // (NAK) quit
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if (firmwareActive) {
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// deactivate, home, clear screen
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init(false, 24, 40);
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}
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break;
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case 22: // (SYN) scroll down
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if (firmwareActive) {
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// scroll display down, leaving cursor
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scrollDown();
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}
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break;
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case 23: // (ETB) scroll up
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if (firmwareActive) {
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// scroll display up, leaving cursor
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scrollUp();
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}
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break;
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case 24: // (CAN) disable mousetext
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if (firmwareActive) {
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// http://www.umich.edu/~archive/apple2/technotes/tn/mous/TN.MOUS.006
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mousetext = false;
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}
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break;
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case 25: // (EM) home
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if (firmwareActive) {
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// Moves cursor to upper-left corner of window (but doesn't clear)
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cursorX = self.textWindow.left;
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cursorY = self.textWindow.top;
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}
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break;
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case 26: // (SUB) clear line
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if (firmwareActive) {
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// Clears the line the cursor position is on
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for (x = 0; x < self.textWindow.width; x += 1) {
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setCellChar(self.textWindow.left + x, cursorY, 0x20);
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}
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}
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break;
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case 27: // (ESC) enable mousetext
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if (firmwareActive) {
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// http://www.umich.edu/~archive/apple2/technotes/tn/mous/TN.MOUS.006
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mousetext = true;
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}
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break;
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case 28: // (FS) fwd. space
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if (firmwareActive) {
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// Moves cursor position one space to the right; from right edge
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// of window, moves it to left end of line below
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cursorX += 1;
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if (cursorX > (self.textWindow.left + self.textWindow.width)) {
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cursorX -= self.textWindow.width;
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cursorY += 1;
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if (cursorY > self.textWindow.top + self.textWindow.height) {
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cursorY = self.textWindow.top + self.textWindow.height;
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}
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}
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}
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break;
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case 29: // (GS) clear EOL
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if (firmwareActive) {
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// Clear line rom cursor position to the right edge of the window
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self.clearEOL();
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}
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break;
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case 30: // RS - gotoXY (not supported from BASIC)
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case 31:
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break;
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default:
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setCellChar(cursorX, cursorY, code);
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self.cursorRight();
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break;
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}
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};
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// Hookable
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this.writeString = function writeString(s) {
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var i;
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for (i = 0; i < s.length; i += 1) {
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this.writeChar(s.charAt(i));
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}
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};
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this.getScreenSize = function getScreenSize() {
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return { width: screenWidth, height: screenHeight };
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};
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this.getCursorPosition = function getCursorPosition() {
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return { x: cursorX, y: cursorY };
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};
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this.setCursorPosition = function setCursorPosition(x, y) {
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if (x !== undefined) {
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x = Math.min(Math.max(Math.floor(x), 0), screenWidth - 1);
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} else {
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x = cursorX;
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}
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if (y !== undefined) {
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y = Math.min(Math.max(Math.floor(y), 0), screenHeight - 1);
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} else {
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y = cursorY;
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}
|
|
|
|
if (x === cursorX && y === cursorY) {
|
|
// no-op
|
|
return;
|
|
}
|
|
|
|
cursorX = x;
|
|
cursorY = y;
|
|
updateCursor();
|
|
};
|
|
|
|
this.showCursor = function showCursor() {
|
|
cursorVisible = true;
|
|
cursorInterval = setInterval(function() {
|
|
cursorState = !cursorState;
|
|
updateCursor();
|
|
}, 500);
|
|
};
|
|
|
|
this.hideCursor = function hideCursor() {
|
|
clearInterval(cursorInterval);
|
|
cursorVisible = false;
|
|
updateCursor();
|
|
|
|
};
|
|
|
|
this.splitScreen = function splitScreen(splitAt) {
|
|
splitPos = splitAt;
|
|
|
|
var y;
|
|
|
|
for (y = 0; y < screenHeight; y += 1) {
|
|
screenRow[y].style.visibility = (y < splitPos) ? "hidden" : "";
|
|
}
|
|
|
|
};
|
|
|
|
|
|
//
|
|
// Input
|
|
//
|
|
|
|
|
|
// Internal
|
|
function onKey(code) {
|
|
var cb, c, s;
|
|
|
|
keyboardRegister = code | 0x80;
|
|
|
|
if (charCallback) {
|
|
keyboardRegister = keyboardRegister & 0x7f;
|
|
|
|
cb = charCallback;
|
|
charCallback = undefined;
|
|
self.hideCursor();
|
|
cb(String.fromCharCode(code));
|
|
} else if (lineCallback) {
|
|
keyboardRegister = keyboardRegister & 0x7f;
|
|
|
|
if (code >= 32 && code <= 127) {
|
|
c = String.fromCharCode(code);
|
|
inputBuffer.push(c);
|
|
self.writeChar(c); // echo
|
|
} else {
|
|
switch (code) {
|
|
case 8: // Left Arrow
|
|
if (inputBuffer.length > 0) {
|
|
inputBuffer.pop();
|
|
self.setCursorPosition(Math.max(self.getCursorPosition().x - 1, 0), self.getCursorPosition().y);
|
|
}
|
|
break;
|
|
|
|
case 13: // Enter
|
|
// Respond to INPUT callback, if defined
|
|
s = inputBuffer.join("");
|
|
inputBuffer = [];
|
|
self.writeString("\r");
|
|
|
|
cb = lineCallback;
|
|
lineCallback = undefined;
|
|
self.hideCursor();
|
|
cb(s);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// else: nothing - key stays in the keyboard register
|
|
|
|
} // onKey
|
|
|
|
function toAppleKey(e) {
|
|
|
|
function ord(c) { return c.charCodeAt(0); }
|
|
|
|
switch (e.code) {
|
|
|
|
// Non-Printables
|
|
case 'Backspace': return 127;
|
|
case 'Tab': return 9; // NOTE: Blocked elsewhere, for web page accessibility
|
|
case 'Enter': return 13;
|
|
case 'Escape': return 27;
|
|
case 'ArrowLeft': return 8;
|
|
case 'ArrowUp': return 11;
|
|
case 'ArrowRight': return 21;
|
|
case 'ArrowDown': return 10;
|
|
case 'Delete': return 127;
|
|
case 'Clear': return 24; // ctrl-X - used on the IIgs
|
|
|
|
// Numeric
|
|
case 'Numpad0': return 0x30;
|
|
case 'Numpad1': return 0x31;
|
|
case 'Numpad2': return 0x32;
|
|
case 'Numpad3': return 0x33;
|
|
case 'Numpad4': return 0x34;
|
|
case 'Numpad5': return 0x35;
|
|
case 'Numpad6': return 0x36;
|
|
case 'Numpad7': return 0x37;
|
|
case 'Numpad8': return 0x38;
|
|
case 'Numpad9': return 0x39;
|
|
|
|
case 'Digit0':
|
|
case 'Digit1':
|
|
case 'Digit2':
|
|
case 'Digit3':
|
|
case 'Digit4':
|
|
case 'Digit5':
|
|
case 'Digit6':
|
|
case 'Digit7':
|
|
case 'Digit8':
|
|
case 'Digit9':
|
|
var digit = e.code.substring(5);
|
|
if (e.ctrlKey) {
|
|
if (e.shiftKey) {
|
|
switch (digit) {
|
|
case '2': return 0; // ctrl-@
|
|
case '6': return 30; // ctrl-^
|
|
}
|
|
}
|
|
return (void 0);
|
|
} else if (e.shiftKey) {
|
|
return ')!@#$%^&*('.charCodeAt(ord(digit) - ord('0'));
|
|
} else {
|
|
return ord(digit);
|
|
}
|
|
|
|
// Alphabetic
|
|
case 'KeyA':
|
|
case 'KeyB':
|
|
case 'KeyC':
|
|
case 'KeyD':
|
|
case 'KeyE':
|
|
case 'KeyF':
|
|
case 'KeyG':
|
|
case 'KeyH':
|
|
case 'KeyI':
|
|
case 'KeyJ':
|
|
case 'KeyK':
|
|
case 'KeyL':
|
|
case 'KeyM':
|
|
case 'KeyN':
|
|
case 'KeyO':
|
|
case 'KeyP':
|
|
case 'KeyQ':
|
|
case 'KeyR':
|
|
case 'KeyS':
|
|
case 'KeyT':
|
|
case 'KeyU':
|
|
case 'KeyV':
|
|
case 'KeyW':
|
|
case 'KeyX':
|
|
case 'KeyY':
|
|
case 'KeyZ':
|
|
var letter = e.code.substring(3);
|
|
if (e.ctrlKey) {
|
|
return ord(letter) - 0x40; // Control keys, Apple II-style
|
|
} else if (capsLock || e.shiftKey) {
|
|
return ord(letter); // Upper case
|
|
} else {
|
|
return ord(letter) + 0x20; // Lower case
|
|
}
|
|
|
|
// Symbol and Punctuation
|
|
case 'Space': return ord(' ');
|
|
case 'Semicolon': return e.shiftKey ? ord(':') : ord(';');
|
|
case 'Equal': return e.shiftKey ? ord('+') : ord('=');
|
|
case 'Comma': return e.shiftKey ? ord('<') : ord(',');
|
|
case 'Minus': return e.ctrlKey ? 31 : e.shiftKey ? ord('_') : ord('-');
|
|
case 'Period': return e.shiftKey ? ord('>') : ord('.');
|
|
case 'Slash': return e.shiftKey ? ord('?') : ord('/');
|
|
case 'Backquote': return e.shiftKey ? ord('~') : ord('`');
|
|
case 'BracketLeft': return e.ctrlKey ? 27 : e.shiftKey ? ord('{') : ord('[');
|
|
case 'Backslash': return e.ctrlKey ? 28 : e.shiftKey ? ord('|') : ord('\\');
|
|
case 'BracketRight': return e.ctrlKey ? 29 : e.shiftKey ? ord('}') : ord(']');
|
|
case 'Quote': return e.shiftKey ? ord('"') : ord('\'');
|
|
|
|
// Apple IIgs Keyboard
|
|
case 'NumpadClear': return 24;
|
|
case 'NumpadAdd': return ord('+');
|
|
case 'NumpadSubtract': return ord('-');
|
|
case 'NumpadMultiply': return ord('*');
|
|
case 'NumpadDivide': return ord('/');
|
|
case 'NumpadDecimal': return ord('.');
|
|
case 'NumpadEnter': return 13;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
function isBrowserKey(e) {
|
|
return e.code === 'Tab' || e.code === 'F5' || e.metaKey;
|
|
}
|
|
|
|
|
|
// Internal
|
|
function handleKeyDown(e) {
|
|
if (!e.code || isBrowserKey(e))
|
|
return true;
|
|
|
|
var handled = false, code;
|
|
|
|
switch (e.code) {
|
|
|
|
case 'CapsLock':
|
|
capsLock = !capsLock;
|
|
handled = true;
|
|
break;
|
|
|
|
// Used as paddle buttons (0=Open Apple, 1=Solid Apple)
|
|
case 'AltLeft':
|
|
case 'Home': buttonState[0] = 255; handled = true; break;
|
|
case 'AltRight':
|
|
case 'End': buttonState[1] = 255; handled = true; break;
|
|
case 'PageUp': buttonState[2] = 255; handled = true; break;
|
|
case 'Shift':
|
|
case 'ShiftLeft':
|
|
case 'ShiftRight':
|
|
buttonState[2] = 255; handled = true; break;
|
|
case 'PageDown': buttonState[3] = 255; handled = true; break;
|
|
|
|
default:
|
|
code = toAppleKey(e);
|
|
if (code !== -1) {
|
|
keyDown = true;
|
|
onKey(code);
|
|
handled = true;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (handled) {
|
|
e.stopPropagation();
|
|
e.preventDefault();
|
|
}
|
|
|
|
return !handled;
|
|
}
|
|
|
|
|
|
// Internal
|
|
function handleKeyUp(e) {
|
|
if (!e.code || isBrowserKey(e))
|
|
return true;
|
|
|
|
var handled = false,
|
|
code;
|
|
|
|
switch (e.code) {
|
|
|
|
case 'CapsLock':
|
|
handled = true;
|
|
break;
|
|
|
|
// Used as paddle buttons (0=Open Apple, 1=Solid Apple)
|
|
case 'AltLeft':
|
|
case 'Home': buttonState[0] = 0; handled = true; break;
|
|
case 'AltRight':
|
|
case 'End': buttonState[1] = 0; handled = true; break;
|
|
case 'PageUp': buttonState[2] = 0; handled = true; break;
|
|
case 'Shift': buttonState[2] = 0; handled = true; break;
|
|
case 'PageDown': buttonState[3] = 0; handled = true; break;
|
|
|
|
default:
|
|
code = toAppleKey(e);
|
|
if (code !== -1) {
|
|
keyDown = false;
|
|
handled = true;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (handled) {
|
|
e.stopPropagation();
|
|
e.preventDefault();
|
|
}
|
|
|
|
return !handled;
|
|
}
|
|
|
|
|
|
this.getButtonState = function getButtonState(btn) {
|
|
return buttonState[btn];
|
|
};
|
|
|
|
|
|
this.focus = function focus() {
|
|
keyboardElement.focus();
|
|
};
|
|
|
|
|
|
// Hookable
|
|
this.readLine = function readLine(callback, prompt) {
|
|
self.writeString(prompt);
|
|
|
|
lineCallback = callback;
|
|
self.showCursor();
|
|
self.focus();
|
|
};
|
|
|
|
|
|
// Hookable
|
|
this.readChar = function readChar(callback) {
|
|
// If there is a key ready, deliver it immediately
|
|
if (keyboardRegister & 0x80) {
|
|
keyboardRegister = keyboardRegister & 0x7f;
|
|
|
|
// Non-blocking return
|
|
setTimeout(function() { callback(String.fromCharCode(keyboardRegister)); }, 0);
|
|
} else {
|
|
charCallback = callback;
|
|
self.showCursor();
|
|
self.focus();
|
|
}
|
|
};
|
|
|
|
|
|
this.getKeyboardRegister = function getKeyboardRegister() {
|
|
self.focus();
|
|
return keyboardRegister;
|
|
};
|
|
|
|
|
|
this.clearKeyboardStrobe = function clearKeyboardStrobe() {
|
|
keyboardRegister = keyboardRegister & 0x7f;
|
|
return keyboardRegister | (keyDown ? 0x80 : 0x00);
|
|
};
|
|
|
|
|
|
//
|
|
// Constructor Logic
|
|
//
|
|
|
|
|
|
init(false, 24, 40);
|
|
|
|
keyboardElement.addEventListener('keydown', handleKeyDown);
|
|
keyboardElement.addEventListener('keyup', handleKeyUp);
|
|
|
|
setInterval(function blinkFlash() {
|
|
styleElem.classList.toggle('jsb-flash');
|
|
}, 250);
|
|
}
|