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squeak.js
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/*
* Copyright (c) 2013-2025 Vanessa Freudenberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
"use strict";
//////////////////////////////////////////////////////////////////////////////
// load vm, plugins, and other libraries
//////////////////////////////////////////////////////////////////////////////
import "./globals.js";
import "./vm.js";
import "./vm.object.js";
import "./vm.object.spur.js";
import "./vm.image.js";
import "./vm.interpreter.js";
import "./vm.interpreter.proxy.js";
import "./vm.instruction.stream.js";
import "./vm.instruction.stream.sista.js";
import "./vm.instruction.printer.js";
import "./vm.primitives.js";
import "./jit.js";
import "./vm.audio.browser.js";
import "./vm.display.js";
import "./vm.display.browser.js";
import "./vm.files.browser.js";
import "./vm.input.js";
import "./vm.input.browser.js";
import "./vm.plugins.js";
import "./vm.plugins.ffi.js";
import "./vm.plugins.javascript.js";
import "./vm.plugins.obsolete.js";
import "./vm.plugins.drop.browser.js";
import "./vm.plugins.file.browser.js";
import "./vm.plugins.jpeg2.browser.js";
import "./vm.plugins.scratch.browser.js";
import "./vm.plugins.sound.browser.js";
import "./plugins/ADPCMCodecPlugin.js";
import "./plugins/B2DPlugin.js";
import "./plugins/B3DAcceleratorPlugin.js";
import "./plugins/BitBltPlugin.js";
import "./plugins/CroquetPlugin.js";
import "./plugins/FFTPlugin.js";
import "./plugins/FloatArrayPlugin.js";
import "./plugins/GeniePlugin.js";
import "./plugins/JPEGReaderPlugin.js";
import "./plugins/KedamaPlugin.js";
import "./plugins/KedamaPlugin2.js";
import "./plugins/Klatt.js";
import "./plugins/LargeIntegers.js";
import "./plugins/Matrix2x3Plugin.js";
import "./plugins/MiscPrimitivePlugin.js";
import "./plugins/MIDIPlugin.js";
import "./plugins/ScratchPlugin.js";
import "./plugins/SocketPlugin.js";
import "./plugins/SpeechPlugin.js";
import "./plugins/SqueakSSL.js";
import "./plugins/SoundGenerationPlugin.js";
import "./plugins/StarSqueakPlugin.js";
import "./plugins/ZipPlugin.js";
import "./ffi/libc.js";
import "./ffi/opengl.js";
import "./lib/lz-string.js";
import "./lib/jszip.js";
import "./lib/FileSaver.js";
import "./lib/sha1.js";
Object.extend(Squeak, {
vmPath: "/",
platformSubtype: "Browser",
osVersion: navigator.userAgent, // might want to parse
windowSystem: "HTML",
});
// UI namespace
window.SqueakJS = {};
//////////////////////////////////////////////////////////////////////////////
// display & event setup
//////////////////////////////////////////////////////////////////////////////
function setupFullscreen(display, canvas, options) {
// Fullscreen can only be enabled in an event handler. So we check the
// fullscreen flag on every mouse down/up and keyboard event.
var box = canvas.parentElement,
fullscreenEvent = "fullscreenchange",
fullscreenElement = "fullscreenElement",
fullscreenEnabled = "fullscreenEnabled";
if (!box.requestFullscreen) {
[ // Fullscreen support is still very browser-dependent
{req: box.webkitRequestFullscreen, exit: document.webkitExitFullscreen,
evt: "webkitfullscreenchange", elem: "webkitFullscreenElement", enable: "webkitFullscreenEnabled"},
{req: box.mozRequestFullScreen, exit: document.mozCancelFullScreen,
evt: "mozfullscreenchange", elem: "mozFullScreenElement", enable: "mozFullScreenEnabled"},
{req: box.msRequestFullscreen, exit: document.msExitFullscreen,
evt: "MSFullscreenChange", elem: "msFullscreenElement", enable: "msFullscreenEnabled"},
].forEach(function(browser) {
if (browser.req) {
box.requestFullscreen = browser.req;
document.exitFullscreen = browser.exit;
fullscreenEvent = browser.evt;
fullscreenElement = browser.elem;
fullscreenEnabled = browser.enable;
}
});
}
// If the user canceled fullscreen, turn off the fullscreen flag so
// we don't try to enable it again in the next event
function fullscreenChange(fullscreen) {
display.fullscreen = fullscreen;
var fullwindow = fullscreen || options.fullscreen;
box.style.background = fullwindow ? 'black' : '';
setTimeout(onresize, 0);
}
var checkFullscreen;
if (box.requestFullscreen) {
document.addEventListener(fullscreenEvent, function(){fullscreenChange(box == document[fullscreenElement]);});
checkFullscreen = function() {
if (document[fullscreenEnabled] && (box == document[fullscreenElement]) != display.fullscreen) {
if (display.fullscreen) box.requestFullscreen();
else document.exitFullscreen();
}
};
} else {
var isFullscreen = false;
checkFullscreen = function() {
if (isFullscreen != display.fullscreen) {
isFullscreen = display.fullscreen;
fullscreenChange(isFullscreen);
}
};
}
return checkFullscreen;
}
function recordModifiers(evt, display) {
var shiftPressed = evt.shiftKey,
ctrlPressed = evt.ctrlKey && !evt.altKey,
cmdPressed = (display.isMac ? evt.metaKey : evt.altKey && !evt.ctrlKey)
|| display.cmdButtonTouched,
modifiers =
(shiftPressed ? Squeak.Keyboard_Shift : 0) +
(ctrlPressed ? Squeak.Keyboard_Ctrl : 0) +
(cmdPressed ? Squeak.Keyboard_Cmd : 0);
display.buttons = (display.buttons & ~Squeak.Keyboard_All) | modifiers;
return modifiers;
}
var canUseMouseOffset = null;
function updateMousePos(evt, canvas, display) {
if (canUseMouseOffset === null) {
// Per https://caniuse.com/mdn-api_mouseevent_offsetx, essentially all *current*
// browsers support `offsetX`/`offsetY`, but it does little harm to fall back to the
// older `layerX`/`layerY` for now.
canUseMouseOffset = 'offsetX' in evt;
}
var evtX = canUseMouseOffset ? evt.offsetX : evt.layerX,
evtY = canUseMouseOffset ? evt.offsetY : evt.layerY;
if (display.cursorCanvas) {
display.cursorCanvas.style.left = (evtX + canvas.offsetLeft + display.cursorOffsetX) + "px";
display.cursorCanvas.style.top = (evtY + canvas.offsetTop + display.cursorOffsetY) + "px";
}
var x = (evtX * canvas.width / canvas.offsetWidth) | 0,
y = (evtY * canvas.height / canvas.offsetHeight) | 0;
// clamp to display size
display.mouseX = Math.max(0, Math.min(display.width, x));
display.mouseY = Math.max(0, Math.min(display.height, y));
}
function recordMouseEvent(what, evt, canvas, display, options) {
updateMousePos(evt, canvas, display);
if (!display.vm) return;
var buttons = display.buttons & Squeak.Mouse_All;
switch (what) {
case 'mousedown':
switch (evt.button || 0) {
case 0: buttons = Squeak.Mouse_Red; break; // left
case 1: buttons = Squeak.Mouse_Yellow; break; // middle
case 2: buttons = Squeak.Mouse_Blue; break; // right
}
if (buttons === Squeak.Mouse_Red && (evt.altKey || evt.metaKey))
buttons = Squeak.Mouse_Yellow; // emulate middle-click
if (options.swapButtons)
if (buttons == Squeak.Mouse_Yellow) buttons = Squeak.Mouse_Blue;
else if (buttons == Squeak.Mouse_Blue) buttons = Squeak.Mouse_Yellow;
break;
case 'mousemove':
break; // nothing more to do
case 'mouseup':
buttons = 0;
break;
}
display.buttons = buttons | recordModifiers(evt, display);
if (display.eventQueue) {
display.eventQueue.push([
Squeak.EventTypeMouse,
evt.timeStamp, // converted to Squeak time in makeSqueakEvent()
display.mouseX,
display.mouseY,
display.buttons & Squeak.Mouse_All,
display.buttons >> 3,
]);
if (display.signalInputEvent)
display.signalInputEvent();
}
display.idle = 0;
if (what === 'mouseup') display.runFor(100, what); // process copy/paste or fullscreen flag change
else display.runNow(what); // don't wait for timeout to run
}
function recordWheelEvent(evt, display) {
if (!display.vm) return;
if (!display.eventQueue || !display.vm.image.isSpur) {
// for old images, queue wheel events as ctrl+up/down
fakeCmdOrCtrlKey(evt.deltaY > 0 ? 31 : 30, evt.timeStamp, display);
return;
// TODO: use or set VM parameter 48 (see vmParameterAt)
}
var squeakEvt = [
Squeak.EventTypeMouseWheel,
evt.timeStamp, // converted to Squeak time in makeSqueakEvent()
evt.deltaX,
-evt.deltaY,
display.buttons & Squeak.Mouse_All,
display.buttons >> 3,
];
display.eventQueue.push(squeakEvt);
if (display.signalInputEvent)
display.signalInputEvent();
display.idle = 0;
if (display.runNow) display.runNow('wheel'); // don't wait for timeout to run
}
// Squeak traditional keycodes are MacRoman
var MacRomanToUnicode = [
0x00C4, 0x00C5, 0x00C7, 0x00C9, 0x00D1, 0x00D6, 0x00DC, 0x00E1,
0x00E0, 0x00E2, 0x00E4, 0x00E3, 0x00E5, 0x00E7, 0x00E9, 0x00E8,
0x00EA, 0x00EB, 0x00ED, 0x00EC, 0x00EE, 0x00EF, 0x00F1, 0x00F3,
0x00F2, 0x00F4, 0x00F6, 0x00F5, 0x00FA, 0x00F9, 0x00FB, 0x00FC,
0x2020, 0x00B0, 0x00A2, 0x00A3, 0x00A7, 0x2022, 0x00B6, 0x00DF,
0x00AE, 0x00A9, 0x2122, 0x00B4, 0x00A8, 0x2260, 0x00C6, 0x00D8,
0x221E, 0x00B1, 0x2264, 0x2265, 0x00A5, 0x00B5, 0x2202, 0x2211,
0x220F, 0x03C0, 0x222B, 0x00AA, 0x00BA, 0x03A9, 0x00E6, 0x00F8,
0x00BF, 0x00A1, 0x00AC, 0x221A, 0x0192, 0x2248, 0x2206, 0x00AB,
0x00BB, 0x2026, 0x00A0, 0x00C0, 0x00C3, 0x00D5, 0x0152, 0x0153,
0x2013, 0x2014, 0x201C, 0x201D, 0x2018, 0x2019, 0x00F7, 0x25CA,
0x00FF, 0x0178, 0x2044, 0x20AC, 0x2039, 0x203A, 0xFB01, 0xFB02,
0x2021, 0x00B7, 0x201A, 0x201E, 0x2030, 0x00C2, 0x00CA, 0x00C1,
0x00CB, 0x00C8, 0x00CD, 0x00CE, 0x00CF, 0x00CC, 0x00D3, 0x00D4,
0xF8FF, 0x00D2, 0x00DA, 0x00DB, 0x00D9, 0x0131, 0x02C6, 0x02DC,
0x00AF, 0x02D8, 0x02D9, 0x02DA, 0x00B8, 0x02DD, 0x02DB, 0x02C7,
];
var UnicodeToMacRoman = {};
for (var i = 0; i < MacRomanToUnicode.length; i++)
UnicodeToMacRoman[MacRomanToUnicode[i]] = i + 128;
function recordKeyboardEvent(unicode, timestamp, display) {
if (!display.vm) return;
var macCode = UnicodeToMacRoman[unicode] || (unicode < 128 ? unicode : 0);
var modifiersAndKey = (display.buttons >> 3) << 8 | macCode;
if (display.eventQueue) {
display.eventQueue.push([
Squeak.EventTypeKeyboard,
timestamp, // converted to Squeak time in makeSqueakEvent()
macCode, // MacRoman
Squeak.EventKeyChar,
display.buttons >> 3,
unicode, // Unicode
]);
if (display.signalInputEvent)
display.signalInputEvent();
// There are some old images that use both event-based
// and polling primitives. To make those work, keep the
// last key event
display.keys[0] = modifiersAndKey;
} else if (modifiersAndKey === display.vm.interruptKeycode) {
display.vm.interruptPending = true;
} else {
// no event queue, queue keys the old-fashioned way
display.keys.push(modifiersAndKey);
}
display.idle = 0;
if (display.runNow) display.runNow('keyboard'); // don't wait for timeout to run
}
function recordDragDropEvent(type, evt, canvas, display) {
if (!display.vm || !display.eventQueue) return;
updateMousePos(evt, canvas, display);
display.eventQueue.push([
Squeak.EventTypeDragDropFiles,
evt.timeStamp, // converted to Squeak time in makeSqueakEvent()
type,
display.mouseX,
display.mouseY,
display.buttons >> 3,
display.droppedFiles.length,
]);
if (display.signalInputEvent)
display.signalInputEvent();
display.idle = 0;
if (display.runNow) display.runNow('drag-drop'); // don't wait for timeout to run
}
function fakeCmdOrCtrlKey(key, timestamp, display) {
// set both Cmd and Ctrl bit, because we don't know what the image wants
display.buttons &= ~Squeak.Keyboard_All; // remove all modifiers
display.buttons |= Squeak.Keyboard_Cmd | Squeak.Keyboard_Ctrl;
display.keys = []; // flush other keys
recordKeyboardEvent(key, timestamp, display);
}
function makeSqueakEvent(evt, sqEvtBuf, sqTimeOffset) {
sqEvtBuf[0] = evt[0];
sqEvtBuf[1] = (evt[1] - sqTimeOffset) & Squeak.MillisecondClockMask;
for (var i = 2; i < evt.length; i++)
sqEvtBuf[i] = evt[i];
}
function createSqueakDisplay(canvas, options) {
options = options || {};
if (options.fullscreen) {
document.body.style.margin = 0;
document.body.style.backgroundColor = 'black';
document.ontouchmove = function(evt) { evt.preventDefault(); };
}
var display = {
context: canvas.getContext("2d"),
fullscreen: false,
width: 0, // if 0, VM uses canvas.width
height: 0, // if 0, VM uses canvas.height
scale: 1, // VM will use window.devicePixelRatio if highdpi is enabled, also changes when touch-zooming
highdpi: options.highdpi, // TODO: use or set VM parameter 48 (see vmParameterAt)
mouseX: 0,
mouseY: 0,
buttons: 0,
keys: [],
cmdButtonTouched: null, // touchscreen button pressed (touch ID)
eventQueue: null, // only used if image uses event primitives
clipboardString: '',
clipboardStringChanged: false,
handlingEvent: '', // set to 'mouse' or 'keyboard' while handling an event
cursorCanvas: options.cursor !== false && document.getElementById("sqCursor") || document.createElement("canvas"),
cursorOffsetX: 0,
cursorOffsetY: 0,
droppedFiles: [],
signalInputEvent: null, // function set by VM
changedCallback: null, // invoked when display size/scale changes
// additional functions added below
};
if (options.pixelated) {
canvas.classList.add("pixelated");
display.cursorCanvas && display.cursorCanvas.classList.add("pixelated");
}
display.reset = function() {
display.eventQueue = null;
display.signalInputEvent = null;
display.lastTick = 0;
display.getNextEvent = function(firstEvtBuf, firstOffset) {
// might be called from VM to get queued event
display.eventQueue = []; // create queue on first call
display.eventQueue.push = function(evt) {
display.eventQueue.offset = Date.now() - evt[1]; // get epoch from first event
delete display.eventQueue.push; // use original push from now on
display.eventQueue.push(evt);
};
display.getNextEvent = function(evtBuf, timeOffset) {
var evt = display.eventQueue.shift();
if (evt) makeSqueakEvent(evt, evtBuf, timeOffset - display.eventQueue.offset);
else evtBuf[0] = Squeak.EventTypeNone;
};
display.getNextEvent(firstEvtBuf, firstOffset);
};
};
display.reset();
var checkFullscreen = setupFullscreen(display, canvas, options);
display.fullscreenRequest = function(fullscreen, thenDo) {
// called from primitive to change fullscreen mode
if (display.fullscreen != fullscreen) {
display.fullscreen = fullscreen;
display.resizeTodo = thenDo; // called after resizing
display.resizeTodoTimeout = setTimeout(display.resizeDone, 1000);
checkFullscreen();
} else thenDo();
};
display.resizeDone = function() {
clearTimeout(display.resizeTodoTimeout);
var todo = display.resizeTodo;
if (todo) {
display.resizeTodo = null;
todo();
}
};
display.clear = function() {
canvas.width = canvas.width;
};
display.setTitle = function(title) {
document.title = title;
};
display.showBanner = function(msg, style) {
style = style || display.context.canvas.style || {};
var ctx = display.context;
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = style.color || "#F90";
ctx.font = style.font || "bold 48px sans-serif";
if (!style.font && ctx.measureText(msg).width > canvas.width)
ctx.font = "bold 24px sans-serif";
ctx.textAlign = "center";
ctx.textBaseline = "middle";
ctx.fillText(msg, canvas.width / 2, canvas.height / 2);
};
display.showProgress = function(value, style) {
style = style || display.context.canvas.style || {};
var ctx = display.context,
w = (canvas.width / 3) | 0,
h = 24,
x = canvas.width * 0.5 - w / 2,
y = canvas.height * 0.5 + 2 * h;
ctx.fillStyle = style.background || "#000";
ctx.fillRect(x, y, w, h);
ctx.lineWidth = 2;
ctx.strokeStyle = style.stroke || "#F90";
ctx.strokeRect(x, y, w, h);
ctx.fillStyle = style.fill || "#F90";
ctx.fillRect(x, y, w * value, h);
};
display.executeClipboardPasteKey = function(text, timestamp) {
if (!display.vm) return true;
try {
display.clipboardString = text;
// simulate paste event for Squeak
fakeCmdOrCtrlKey('v'.charCodeAt(0), timestamp, display);
} catch(err) {
console.error("paste error " + err);
}
};
display.executeClipboardCopyKey = function(key, timestamp) {
if (!display.vm) return true;
// simulate copy event for Squeak so it places its text in clipboard
display.clipboardStringChanged = false;
fakeCmdOrCtrlKey((key || 'c').charCodeAt(0), timestamp, display);
var start = Date.now();
// now interpret until Squeak has copied to the clipboard
while (!display.clipboardStringChanged && Date.now() - start < 500)
display.vm.interpret(20);
if (!display.clipboardStringChanged) return;
// got it, now copy to the system clipboard
try {
return display.clipboardString;
} catch(err) {
console.error("copy error " + err);
}
};
canvas.onmousedown = function(evt) {
checkFullscreen();
recordMouseEvent('mousedown', evt, canvas, display, options);
evt.preventDefault();
return false;
};
canvas.onmouseup = function(evt) {
recordMouseEvent('mouseup', evt, canvas, display, options);
checkFullscreen();
evt.preventDefault();
};
canvas.onmousemove = function(evt) {
recordMouseEvent('mousemove', evt, canvas, display, options);
evt.preventDefault();
};
canvas.onwheel = function(evt) {
recordWheelEvent(evt, display);
evt.preventDefault();
};
canvas.oncontextmenu = function() {
return false;
};
// touch event handling
var touch = {
state: 'idle',
button: 0,
x: 0,
y: 0,
dist: 0,
down: {},
};
function touchToMouse(evt) {
if (evt.touches.length) {
// average all touch positions
// but ignore the cmd button touch
var x = 0, y = 0, n = 0;
for (var i = 0; i < evt.touches.length; i++) {
if (evt.touches[i].identifier === display.cmdButtonTouched) continue;
x += evt.touches[i].pageX;
y += evt.touches[i].pageY;
n++;
}
if (n > 0) {
touch.x = x / n;
touch.y = y / n;
}
}
return {
timeStamp: evt.timeStamp,
button: touch.button,
offsetX: touch.x - canvas.offsetLeft,
offsetY: touch.y - canvas.offsetTop,
};
}
function dd(ax, ay, bx, by) {var x = ax - bx, y = ay - by; return Math.sqrt(x*x + y*y);}
function dist(a, b) {return dd(a.pageX, a.pageY, b.pageX, b.pageY);}
function dent(n, l, t, u) { return n < l ? n + t - l : n > u ? n + t - u : t; }
function adjustCanvas(l, t, w, h) {
var cursorCanvas = display.cursorCanvas,
cssScale = w / canvas.width,
ratio = display.highdpi ? window.devicePixelRatio : 1,
pixelScale = cssScale * ratio;
canvas.style.left = (l|0) + "px";
canvas.style.top = (t|0) + "px";
canvas.style.width = (w|0) + "px";
canvas.style.height = (h|0) + "px";
if (cursorCanvas) {
cursorCanvas.style.left = (l + display.cursorOffsetX + display.mouseX * cssScale|0) + "px";
cursorCanvas.style.top = (t + display.cursorOffsetY + display.mouseY * cssScale|0) + "px";
cursorCanvas.style.width = (cursorCanvas.width * pixelScale|0) + "px";
cursorCanvas.style.height = (cursorCanvas.height * pixelScale|0) + "px";
}
// if pixelation is not forced, turn it on for integer scales
if (!options.pixelated) {
if (pixelScale % 1 === 0 || pixelScale > 5) {
canvas.classList.add("pixelated");
cursorCanvas && cursorCanvas.classList.add("pixelated");
} else {
canvas.classList.remove("pixelated");
cursorCanvas && display.cursorCanvas.classList.remove("pixelated");
}
}
display.css = {
left: l,
top: t,
width: w,
height: h,
scale: cssScale,
pixelScale: pixelScale,
ratio: ratio,
};
if (display.changedCallback) display.changedCallback();
return cssScale;
}
// zooming/panning with two fingers
var maxZoom = 5;
function zoomStart(evt) {
touch.dist = dist(evt.touches[0], evt.touches[1]);
touch.down.x = touch.x;
touch.down.y = touch.y;
touch.down.dist = touch.dist;
touch.down.left = canvas.offsetLeft;
touch.down.top = canvas.offsetTop;
touch.down.width = canvas.offsetWidth;
touch.down.height = canvas.offsetHeight;
// store original canvas bounds
if (!touch.orig) touch.orig = {
left: touch.down.left,
top: touch.down.top,
right: touch.down.left + touch.down.width,
bottom: touch.down.top + touch.down.height,
width: touch.down.width,
height: touch.down.height,
};
}
function zoomMove(evt) {
if (evt.touches.length < 2) return;
touch.dist = dist(evt.touches[0], evt.touches[1]);
var minScale = touch.orig.width / touch.down.width,
//nowScale = dent(touch.dist / touch.down.dist, 0.8, 1, 1.5),
nowScale = touch.dist / touch.down.dist,
scale = Math.min(Math.max(nowScale, minScale * 0.95), minScale * maxZoom),
w = touch.down.width * scale,
h = touch.orig.height * w / touch.orig.width,
l = touch.down.left - (touch.down.x - touch.down.left) * (scale - 1) + (touch.x - touch.down.x),
t = touch.down.top - (touch.down.y - touch.down.top) * (scale - 1) + (touch.y - touch.down.y);
// allow to rubber-band by 20px for feedback
l = Math.max(Math.min(l, touch.orig.left + 20), touch.orig.right - w - 20);
t = Math.max(Math.min(t, touch.orig.top + 20), touch.orig.bottom - h - 20);
adjustCanvas(l, t, w, h);
}
function zoomEnd(evt) {
var l = canvas.offsetLeft,
t = canvas.offsetTop,
w = canvas.offsetWidth,
h = canvas.offsetHeight;
w = Math.min(Math.max(w, touch.orig.width), touch.orig.width * maxZoom);
h = touch.orig.height * w / touch.orig.width;
l = Math.max(Math.min(l, touch.orig.left), touch.orig.right - w);
t = Math.max(Math.min(t, touch.orig.top), touch.orig.bottom - h);
var scale = adjustCanvas(l, t, w, h);
if ((scale - display.scale) < 0.0001) {
touch.orig = null;
onresize();
}
}
// State machine to distinguish between 1st/2nd mouse button and zoom/pan:
// * if moved, or no 2nd finger within 100ms of 1st down, start mousing
// * if fingers moved significantly within 200ms of 2nd down, start zooming
// * if touch ended within this time, generate click (down+up)
// * otherwise, start mousing with 2nd button
// * also, ignore finger on cmd button
// When mousing, always generate a move event before down event so that
// mouseover eventhandlers in image work better
canvas.ontouchstart = function(evt) {
evt.preventDefault();
var e = touchToMouse(evt);
for (var i = 0; i < evt.changedTouches.length; i++) {
if (evt.changedTouches[i].identifier === display.cmdButtonTouched) continue;
switch (touch.state) {
case 'idle':
touch.state = 'got1stFinger';
touch.first = e;
setTimeout(function(){
if (touch.state !== 'got1stFinger') return;
touch.state = 'mousing';
touch.button = e.button = 0;
recordMouseEvent('mousemove', e, canvas, display, options);
recordMouseEvent('mousedown', e, canvas, display, options);
}, 100);
break;
case 'got1stFinger':
touch.state = 'got2ndFinger';
zoomStart(evt);
setTimeout(function(){
if (touch.state !== 'got2ndFinger') return;
var didMove = Math.abs(touch.down.dist - touch.dist) > 10 ||
dd(touch.down.x, touch.down.y, touch.x, touch.y) > 10;
if (didMove) {
touch.state = 'zooming';
} else {
touch.state = 'mousing';
touch.button = e.button = 2;
recordMouseEvent('mousemove', e, canvas, display, options);
recordMouseEvent('mousedown', e, canvas, display, options);
}
}, 200);
break;
}
}
};
canvas.ontouchmove = function(evt) {
evt.preventDefault();
var e = touchToMouse(evt);
switch (touch.state) {
case 'got1stFinger':
touch.state = 'mousing';
touch.button = e.button = 0;
recordMouseEvent('mousemove', e, canvas, display, options);
recordMouseEvent('mousedown', e, canvas, display, options);
break;
case 'mousing':
recordMouseEvent('mousemove', e, canvas, display, options);
break;
case 'got2ndFinger':
if (evt.touches.length > 1)
touch.dist = dist(evt.touches[0], evt.touches[1]);
break;
case 'zooming':
zoomMove(evt);
break;
}
};
canvas.ontouchend = function(evt) {
evt.preventDefault();
checkFullscreen();
var e = touchToMouse(evt);
var n = evt.touches.length;
if (Array.from(evt.touches).findIndex(t => t.identifier === display.cmdButtonTouched) >= 0) n--;
for (var i = 0; i < evt.changedTouches.length; i++) {
if (evt.changedTouches[i].identifier === display.cmdButtonTouched) {
continue;
}
switch (touch.state) {
case 'mousing':
if (n > 0) break;
touch.state = 'idle';
recordMouseEvent('mouseup', e, canvas, display, options);
break;
case 'got1stFinger':
touch.state = 'idle';
touch.button = e.button = 0;
recordMouseEvent('mousemove', e, canvas, display, options);
recordMouseEvent('mousedown', e, canvas, display, options);
recordMouseEvent('mouseup', e, canvas, display, options);
break;
case 'got2ndFinger':
touch.state = 'mousing';
touch.button = e.button = 2;
recordMouseEvent('mousemove', e, canvas, display, options);
recordMouseEvent('mousedown', e, canvas, display, options);
break;
case 'zooming':
if (n > 0) break;
touch.state = 'idle';
zoomEnd(evt);
break;
}
}
};
canvas.ontouchcancel = function(evt) {
canvas.ontouchend(evt);
};
// cursorCanvas shows Squeak cursor
if (display.cursorCanvas) {
var absolute = window.getComputedStyle(canvas).position === "absolute";
display.cursorCanvas.style.display = "block";
display.cursorCanvas.style.position = absolute ? "absolute": "fixed";
display.cursorCanvas.style.cursor = "none";
display.cursorCanvas.style.background = "transparent";
display.cursorCanvas.style.pointerEvents = "none";
canvas.parentElement.appendChild(display.cursorCanvas);
canvas.style.cursor = "none";
}
// keyboard stuff
// create hidden input field to capture not only keyboard events
// but also copy/paste and input events (for dead keys)
var input = document.createElement("input");
input.setAttribute("autocomplete", "off");
input.setAttribute("autocorrect", "off");
input.setAttribute("autocapitalize", "off");
input.setAttribute("spellcheck", "false");
input.style.position = "absolute";
input.style.left = "-1000px";
canvas.parentElement.appendChild(input);
// touch-keyboard buttons
if ('ontouchstart' in document) {
// button to show on-screen keyboard
var keyboardButton = document.createElement('div');
keyboardButton.innerHTML = '<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg width="50px" height="50px" viewBox="0 0 150 150" version="1.1" xmlns="http://www.w3.org/2000/svg"><g id="Page-1" stroke="none" fill="#000000"><rect x="33" y="105" width="10" height="10" rx="1"></rect><rect x="26" y="60" width="10" height="10" rx="1"></rect><rect x="41" y="60" width="10" height="10" rx="1"></rect><rect x="56" y="60" width="10" height="10" rx="1"></rect><rect x="71" y="60" width="10" height="10" rx="1"></rect><rect x="86" y="60" width="10" height="10" rx="1"></rect><rect x="101" y="60" width="10" height="10" rx="1"></rect><rect x="116" y="60" width="10" height="10" rx="1"></rect><rect x="108" y="105" width="10" height="10" rx="1"></rect><rect x="33" y="75" width="10" height="10" rx="1"></rect><rect x="48" y="75" width="10" height="10" rx="1"></rect><rect x="63" y="75" width="10" height="10" rx="1"></rect><rect x="78" y="75" width="10" height="10" rx="1"></rect><rect x="93" y="75" width="10" height="10" rx="1"></rect><rect x="108" y="75" width="10" height="10" rx="1"></rect><rect x="41" y="90" width="10" height="10" rx="1"></rect><rect x="26" y="90" width="10" height="10" rx="1"></rect><rect x="56" y="90" width="10" height="10" rx="1"></rect><rect x="71" y="90" width="10" height="10" rx="1"></rect><rect x="86" y="90" width="10" height="10" rx="1"></rect><rect x="101" y="90" width="10" height="10" rx="1"></rect><rect x="116" y="90" width="10" height="10" rx="1"></rect><rect x="48" y="105" width="55" height="10" rx="1"></rect><path d="M20.0056004,51 C18.3456532,51 17.0000001,52.3496496 17.0000001,54.0038284 L17.0000001,85.6824519 L17,120.003453 C17.0000001,121.6584 18.3455253,123 20.0056004,123 L131.9944,123 C133.654347,123 135,121.657592 135,119.997916 L135,54.0020839 C135,52.3440787 133.654475,51 131.9944,51 L20.0056004,51 Z" fill="none" stroke="#000000" stroke-width="2"></path><path d="M52.0410156,36.6054687 L75.5449219,21.6503905 L102.666016,36.6054687" id="Line" stroke="#000000" stroke-width="3" stroke-linecap="round" fill="none"></path></g></svg>';
keyboardButton.setAttribute('style', 'position:fixed;right:0;bottom:0;background-color:rgba(128,128,128,0.5);border-radius:5px');
canvas.parentElement.appendChild(keyboardButton);
keyboardButton.onmousedown = function(evt) {
// show on-screen keyboard
input.focus({ preventScroll: true });
evt.preventDefault();
}
keyboardButton.ontouchstart = keyboardButton.onmousedown;
// modifier button for CMD key
var cmdButton = document.createElement('div');
cmdButton.innerHTML = '⌘';
cmdButton.setAttribute('style', 'position:fixed;left:0;background-color:rgba(128,128,128,0.5);width:50px;height:50px;font-size:30px;text-align:center;vertical-align:middle;line-height:50px;border-radius:5px');
if (window.visualViewport) {
// fix position of button when virtual keyboard is shown
const vv = window.visualViewport;
const fixPosition = () => cmdButton.style.top = `${vv.height}px`;
vv.addEventListener('resize', fixPosition);
cmdButton.style.transform = `translateY(-100%)`;
fixPosition();
} else {
cmdButton.style.bottom = '0';
}
canvas.parentElement.appendChild(cmdButton);
cmdButton.ontouchstart = function(evt) {
display.cmdButtonTouched = evt.changedTouches[0].identifier;
cmdButton.style.backgroundColor = 'rgba(255,255,255,0.5)';
evt.preventDefault();
evt.stopPropagation();
}
cmdButton.ontouchend = function(evt) {
display.cmdButtonTouched = null;
cmdButton.style.backgroundColor = 'rgba(128,128,128,0.5)';
evt.preventDefault();
evt.stopPropagation();
}
cmdButton.ontouchcancel = cmdButton.ontouchend;
} else {
// keep focus on input field
input.onblur = function() { input.focus({ preventScroll: true }); };
input.focus({ preventScroll: true });
}
display.isMac = navigator.userAgent.includes("Mac");
// emulate keypress events
var deadKey = false, // true if last keydown was a dead key
deadChars = [];
input.oninput = function(evt) {
if (!display.vm) return true;
if (evt.inputType === "insertText" // regular key, or Chrome
|| evt.inputType === "insertCompositionText" // Firefox, Chrome
|| evt.inputType === "insertFromComposition") // Safari
{
// generate backspace to delete inserted dead chars
var hadDeadChars = deadChars.length > 0;
if (hadDeadChars) {
var oldButtons = display.buttons;
display.buttons &= ~Squeak.Keyboard_All; // remove all modifiers
for (var i = 0; i < deadChars.length; i++) {
recordKeyboardEvent(8, evt.timeStamp, display);
}
display.buttons = oldButtons;
deadChars = [];
}
// generate keyboard events for each character
// single input could be many characters, e.g. for emoji
var chars = Array.from(evt.data); // split by surrogate pairs
for (var i = 0; i < chars.length; i++) {
var unicode = chars[i].codePointAt(0); // codePointAt combines pair into unicode
recordKeyboardEvent(unicode, evt.timeStamp, display);
}
if (!hadDeadChars && evt.isComposing && evt.inputType === "insertCompositionText") {
deadChars = deadChars.concat(chars);
}
}
if (!deadChars.length) resetInput();
};
input.onkeydown = function(evt) {
checkFullscreen();
if (!display.vm) return true;
deadKey = evt.key === "Dead";
if (deadKey) return; // let browser handle dead keys
recordModifiers(evt, display);
var squeakCode = ({
8: 8, // Backspace
9: 9, // Tab
13: 13, // Return
27: 27, // Escape
32: 32, // Space
33: 11, // PageUp
34: 12, // PageDown
35: 4, // End
36: 1, // Home
37: 28, // Left
38: 30, // Up
39: 29, // Right
40: 31, // Down
45: 5, // Insert
46: 127, // Delete
})[evt.keyCode];
if (squeakCode) { // special key pressed
recordKeyboardEvent(squeakCode, evt.timeStamp, display);
return evt.preventDefault();
}
// copy/paste new-style
if (display.isMac ? evt.metaKey : evt.ctrlKey) {
switch (evt.key) {
case "c":
case "x":
if (!navigator.clipboard) return; // fire document.oncopy/oncut
var text = display.executeClipboardCopyKey(evt.key, evt.timeStamp);
if (typeof text === 'string') {
navigator.clipboard.writeText(text)
.catch(function(err) { console.error("display: copy error " + err.message); });
}
return evt.preventDefault();
case "v":
if (!navigator.clipboard) return; // fire document.onpaste
navigator.clipboard.readText()
.then(function(text) {
display.executeClipboardPasteKey(text, evt.timeStamp);
})
.catch(function(err) { console.error("display: paste error " + err.message); });
return evt.preventDefault();
}
}
if (evt.key.length !== 1) return; // let browser handle other keys
if (display.buttons & (Squeak.Keyboard_Cmd | Squeak.Keyboard_Ctrl)) {
var code = evt.key.toLowerCase().charCodeAt(0);
if ((display.buttons & Squeak.Keyboard_Ctrl) && code >= 96 && code < 127) code &= 0x1F; // ctrl-<key>
recordKeyboardEvent(code, evt.timeStamp, display);
return evt.preventDefault();
}
};
input.onkeyup = function(evt) {
if (!display.vm) return true;
recordModifiers(evt, display);
};
function resetInput() {
input.value = "**";
input.selectionStart = 1;
input.selectionEnd = 1;
}
resetInput();
// hack to generate arrow keys when moving the cursor (e.g. via spacebar on iPhone)
// we're not getting any events for that but the cursor (selection) changes
if ('ontouchstart' in document) {
let count = 0; // count how often the interval has run after the first move
setInterval(() => {
const direction = input.selectionStart - 1;
if (direction === 0) {
count = 0;
return;
}
// move cursor once, then not for 500ms, then every 250ms
if (count === 0 || count > 2) {
const key = direction < 1 ? 28 : 29; // arrow left or right
recordKeyboardEvent(key, Date.now(), display);
}
input.selectionStart = 1;
input.selectionEnd = 1;
count++;
}, 250);
}
// more copy/paste
if (navigator.clipboard) {
// new-style copy/paste (all modern browsers)
display.readFromSystemClipboard = () => display.handlingEvent &&
navigator.clipboard.readText()
.then(text => display.clipboardString = text)
.catch(err => console.error("readFromSystemClipboard " + err.message));
display.writeToSystemClipboard = () => display.handlingEvent &&
navigator.clipboard.writeText(display.clipboardString)
.then(() => display.clipboardStringChanged = false)
.catch(err => console.error("writeToSystemClipboard " + err.message));
} else {
// old-style copy/paste
document.oncopy = function(evt, key) {
var text = display.executeClipboardCopyKey(key, evt.timeStamp);
if (typeof text === 'string') {
evt.clipboardData.setData("Text", text);
}
evt.preventDefault();
};
document.oncut = function(evt) {
if (!display.vm) return true;
document.oncopy(evt, 'x');
};
document.onpaste = function(evt) {
var text = evt.clipboardData.getData('Text');
display.executeClipboardPasteKey(text, evt.timeStamp);
evt.preventDefault();
};
}
// do not use addEventListener, we want to replace any previous drop handler
function dragEventHasFiles(evt) {
for (var i = 0; i < evt.dataTransfer.types.length; i++)
if (evt.dataTransfer.types[i] == 'Files') return true;
return false;
}
document.ondragover = function(evt) {
evt.preventDefault();
if (!dragEventHasFiles(evt)) {
evt.dataTransfer.dropEffect = 'none';
} else {
evt.dataTransfer.dropEffect = 'copy';
recordDragDropEvent(Squeak.EventDragMove, evt, canvas, display);
}
};
document.ondragenter = function(evt) {
if (!dragEventHasFiles(evt)) return;
recordDragDropEvent(Squeak.EventDragEnter, evt, canvas, display);
};
document.ondragleave = function(evt) {
if (!dragEventHasFiles(evt)) return;
recordDragDropEvent(Squeak.EventDragLeave, evt, canvas, display);
};
document.ondrop = function(evt) {
evt.preventDefault();
if (!dragEventHasFiles(evt)) return false;
var files = [].slice.call(evt.dataTransfer.files),
loaded = [],
image, imageName = null;
display.droppedFiles = [];
files.forEach(function(f) {
var path = options.root + f.name;
display.droppedFiles.push(path);
var reader = new FileReader();
reader.onload = function () {
var buffer = this.result;
Squeak.filePut(path, buffer);
loaded.push(path);
if (!image && /.*image$/.test(path) && (!display.vm || confirm("Run " + f.name + " now?\n(cancel to use as file)"))) {
image = buffer;
imageName = path;
}
if (loaded.length == files.length) {
if (image) {
if (display.vm) {
display.quitFlag = true;
options.onQuit = function(vm, display, options) {
options.onQuit = null;
SqueakJS.appName = imageName.replace(/.*\//,'').replace(/\.image$/,'');
SqueakJS.runImage(image, imageName, display, options);