| 1 |
// DOM.event.move |
| 2 |
// |
| 3 |
// 2.0.1 |
| 4 |
// |
| 5 |
// Stephen Band |
| 6 |
// |
| 7 |
// Triggers 'movestart', 'move' and 'moveend' events after |
| 8 |
// mousemoves following a mousedown cross a distance threshold, |
| 9 |
// similar to the native 'dragstart', 'drag' and 'dragend' events. |
| 10 |
// Move events are throttled to animation frames. Move event objects |
| 11 |
// have the properties: |
| 12 |
// |
| 13 |
// pageX: |
| 14 |
// pageY: Page coordinates of pointer. |
| 15 |
// startX: |
| 16 |
// startY: Page coordinates of pointer at movestart. |
| 17 |
// distX: |
| 18 |
// distY: Distance the pointer has moved since movestart. |
| 19 |
// deltaX: |
| 20 |
// deltaY: Distance the finger has moved since last event. |
| 21 |
// velocityX: |
| 22 |
// velocityY: Average velocity over last few events. |
| 23 |
|
| 24 |
|
| 25 |
(function(fn) { |
| 26 |
if (typeof define === 'function' && define.amd) { |
| 27 |
define([], fn); |
| 28 |
} else if ((typeof module !== "undefined" && module !== null) && module.exports) { |
| 29 |
module.exports = fn; |
| 30 |
} else { |
| 31 |
fn(); |
| 32 |
} |
| 33 |
})(function(){ |
| 34 |
var assign = Object.assign || window.jQuery && jQuery.extend; |
| 35 |
|
| 36 |
// Number of pixels a pressed pointer travels before movestart |
| 37 |
// event is fired. |
| 38 |
var threshold = 8; |
| 39 |
|
| 40 |
// Shim for requestAnimationFrame, falling back to timer. See: |
| 41 |
// see http://paulirish.com/2011/requestanimationframe-for-smart-animating/ |
| 42 |
var requestFrame = (function(){ |
| 43 |
return ( |
| 44 |
window.requestAnimationFrame || |
| 45 |
window.webkitRequestAnimationFrame || |
| 46 |
window.mozRequestAnimationFrame || |
| 47 |
window.oRequestAnimationFrame || |
| 48 |
window.msRequestAnimationFrame || |
| 49 |
function(fn, element){ |
| 50 |
return window.setTimeout(function(){ |
| 51 |
fn(); |
| 52 |
}, 25); |
| 53 |
} |
| 54 |
); |
| 55 |
})(); |
| 56 |
|
| 57 |
var ignoreTags = { |
| 58 |
textarea: true, |
| 59 |
input: true, |
| 60 |
select: true, |
| 61 |
button: true |
| 62 |
}; |
| 63 |
|
| 64 |
var mouseevents = { |
| 65 |
move: 'mousemove', |
| 66 |
cancel: 'mouseup dragstart', |
| 67 |
end: 'mouseup' |
| 68 |
}; |
| 69 |
|
| 70 |
var touchevents = { |
| 71 |
move: 'touchmove', |
| 72 |
cancel: 'touchend', |
| 73 |
end: 'touchend' |
| 74 |
}; |
| 75 |
|
| 76 |
var rspaces = /\s+/; |
| 77 |
|
| 78 |
|
| 79 |
// DOM Events |
| 80 |
|
| 81 |
var eventOptions = { bubbles: true, cancelable: true }; |
| 82 |
|
| 83 |
var eventsSymbol = Symbol('events'); |
| 84 |
|
| 85 |
function createEvent(type) { |
| 86 |
return new CustomEvent(type, eventOptions); |
| 87 |
} |
| 88 |
|
| 89 |
function getEvents(node) { |
| 90 |
return node[eventsSymbol] || (node[eventsSymbol] = {}); |
| 91 |
} |
| 92 |
|
| 93 |
function on(node, types, fn, data, selector) { |
| 94 |
types = types.split(rspaces); |
| 95 |
|
| 96 |
var events = getEvents(node); |
| 97 |
var i = types.length; |
| 98 |
var handlers, type; |
| 99 |
|
| 100 |
function handler(e) { fn(e, data); } |
| 101 |
|
| 102 |
while (i--) { |
| 103 |
type = types[i]; |
| 104 |
handlers = events[type] || (events[type] = []); |
| 105 |
handlers.push([fn, handler]); |
| 106 |
node.addEventListener(type, handler); |
| 107 |
} |
| 108 |
} |
| 109 |
|
| 110 |
function off(node, types, fn, selector) { |
| 111 |
types = types.split(rspaces); |
| 112 |
|
| 113 |
var events = getEvents(node); |
| 114 |
var i = types.length; |
| 115 |
var type, handlers, k; |
| 116 |
|
| 117 |
if (!events) { return; } |
| 118 |
|
| 119 |
while (i--) { |
| 120 |
type = types[i]; |
| 121 |
handlers = events[type]; |
| 122 |
if (!handlers) { continue; } |
| 123 |
k = handlers.length; |
| 124 |
while (k--) { |
| 125 |
if (handlers[k][0] === fn) { |
| 126 |
node.removeEventListener(type, handlers[k][1]); |
| 127 |
handlers.splice(k, 1); |
| 128 |
} |
| 129 |
} |
| 130 |
} |
| 131 |
} |
| 132 |
|
| 133 |
function trigger(node, type, properties) { |
| 134 |
// Don't cache events. It prevents you from triggering an event of a |
| 135 |
// given type from inside the handler of another event of that type. |
| 136 |
var event = createEvent(type); |
| 137 |
if (properties) { assign(event, properties); } |
| 138 |
node.dispatchEvent(event); |
| 139 |
} |
| 140 |
|
| 141 |
|
| 142 |
// Constructors |
| 143 |
|
| 144 |
function Timer(fn){ |
| 145 |
var callback = fn, |
| 146 |
active = false, |
| 147 |
running = false; |
| 148 |
|
| 149 |
function trigger(time) { |
| 150 |
if (active){ |
| 151 |
callback(); |
| 152 |
requestFrame(trigger); |
| 153 |
running = true; |
| 154 |
active = false; |
| 155 |
} |
| 156 |
else { |
| 157 |
running = false; |
| 158 |
} |
| 159 |
} |
| 160 |
|
| 161 |
this.kick = function(fn) { |
| 162 |
active = true; |
| 163 |
if (!running) { trigger(); } |
| 164 |
}; |
| 165 |
|
| 166 |
this.end = function(fn) { |
| 167 |
var cb = callback; |
| 168 |
|
| 169 |
if (!fn) { return; } |
| 170 |
|
| 171 |
// If the timer is not running, simply call the end callback. |
| 172 |
if (!running) { |
| 173 |
fn(); |
| 174 |
} |
| 175 |
// If the timer is running, and has been kicked lately, then |
| 176 |
// queue up the current callback and the end callback, otherwise |
| 177 |
// just the end callback. |
| 178 |
else { |
| 179 |
callback = active ? |
| 180 |
function(){ cb(); fn(); } : |
| 181 |
fn ; |
| 182 |
|
| 183 |
active = true; |
| 184 |
} |
| 185 |
}; |
| 186 |
} |
| 187 |
|
| 188 |
|
| 189 |
// Functions |
| 190 |
|
| 191 |
function noop() {} |
| 192 |
|
| 193 |
function preventDefault(e) { |
| 194 |
e.preventDefault(); |
| 195 |
} |
| 196 |
|
| 197 |
function isIgnoreTag(e) { |
| 198 |
return !!ignoreTags[e.target.tagName.toLowerCase()]; |
| 199 |
} |
| 200 |
|
| 201 |
function isPrimaryButton(e) { |
| 202 |
// Ignore mousedowns on any button other than the left (or primary) |
| 203 |
// mouse button, or when a modifier key is pressed. |
| 204 |
return (e.which === 1 && !e.ctrlKey && !e.altKey); |
| 205 |
} |
| 206 |
|
| 207 |
function identifiedTouch(touchList, id) { |
| 208 |
var i, l; |
| 209 |
|
| 210 |
if (touchList.identifiedTouch) { |
| 211 |
return touchList.identifiedTouch(id); |
| 212 |
} |
| 213 |
|
| 214 |
// touchList.identifiedTouch() does not exist in |
| 215 |
// webkit yet… we must do the search ourselves... |
| 216 |
|
| 217 |
i = -1; |
| 218 |
l = touchList.length; |
| 219 |
|
| 220 |
while (++i < l) { |
| 221 |
if (touchList[i].identifier === id) { |
| 222 |
return touchList[i]; |
| 223 |
} |
| 224 |
} |
| 225 |
} |
| 226 |
|
| 227 |
function changedTouch(e, data) { |
| 228 |
var touch = identifiedTouch(e.changedTouches, data.identifier); |
| 229 |
|
| 230 |
// This isn't the touch you're looking for. |
| 231 |
if (!touch) { return; } |
| 232 |
|
| 233 |
// Chrome Android (at least) includes touches that have not |
| 234 |
// changed in e.changedTouches. That's a bit annoying. Check |
| 235 |
// that this touch has changed. |
| 236 |
if (touch.pageX === data.pageX && touch.pageY === data.pageY) { return; } |
| 237 |
|
| 238 |
return touch; |
| 239 |
} |
| 240 |
|
| 241 |
|
| 242 |
// Handlers that decide when the first movestart is triggered |
| 243 |
|
| 244 |
function mousedown(e){ |
| 245 |
// Ignore non-primary buttons |
| 246 |
if (!isPrimaryButton(e)) { return; } |
| 247 |
|
| 248 |
// Ignore form and interactive elements |
| 249 |
if (isIgnoreTag(e)) { return; } |
| 250 |
|
| 251 |
on(document, mouseevents.move, mousemove, e); |
| 252 |
on(document, mouseevents.cancel, mouseend, e); |
| 253 |
} |
| 254 |
|
| 255 |
function mousemove(e, data){ |
| 256 |
checkThreshold(e, data, e, removeMouse); |
| 257 |
} |
| 258 |
|
| 259 |
function mouseend(e, data) { |
| 260 |
removeMouse(); |
| 261 |
} |
| 262 |
|
| 263 |
function removeMouse() { |
| 264 |
off(document, mouseevents.move, mousemove); |
| 265 |
off(document, mouseevents.cancel, mouseend); |
| 266 |
} |
| 267 |
|
| 268 |
function touchstart(e) { |
| 269 |
// Don't get in the way of interaction with form elements |
| 270 |
if (ignoreTags[e.target.tagName.toLowerCase()]) { return; } |
| 271 |
|
| 272 |
var touch = e.changedTouches[0]; |
| 273 |
|
| 274 |
// iOS live updates the touch objects whereas Android gives us copies. |
| 275 |
// That means we can't trust the touchstart object to stay the same, |
| 276 |
// so we must copy the data. This object acts as a template for |
| 277 |
// movestart, move and moveend event objects. |
| 278 |
var data = { |
| 279 |
target: touch.target, |
| 280 |
pageX: touch.pageX, |
| 281 |
pageY: touch.pageY, |
| 282 |
identifier: touch.identifier, |
| 283 |
|
| 284 |
// The only way to make handlers individually unbindable is by |
| 285 |
// making them unique. |
| 286 |
touchmove: function(e, data) { touchmove(e, data); }, |
| 287 |
touchend: function(e, data) { touchend(e, data); } |
| 288 |
}; |
| 289 |
|
| 290 |
on(document, touchevents.move, data.touchmove, data); |
| 291 |
on(document, touchevents.cancel, data.touchend, data); |
| 292 |
} |
| 293 |
|
| 294 |
function touchmove(e, data) { |
| 295 |
var touch = changedTouch(e, data); |
| 296 |
if (!touch) { return; } |
| 297 |
checkThreshold(e, data, touch, removeTouch); |
| 298 |
} |
| 299 |
|
| 300 |
function touchend(e, data) { |
| 301 |
var touch = identifiedTouch(e.changedTouches, data.identifier); |
| 302 |
if (!touch) { return; } |
| 303 |
removeTouch(data); |
| 304 |
} |
| 305 |
|
| 306 |
function removeTouch(data) { |
| 307 |
off(document, touchevents.move, data.touchmove); |
| 308 |
off(document, touchevents.cancel, data.touchend); |
| 309 |
} |
| 310 |
|
| 311 |
function checkThreshold(e, data, touch, fn) { |
| 312 |
var distX = touch.pageX - data.pageX; |
| 313 |
var distY = touch.pageY - data.pageY; |
| 314 |
|
| 315 |
// Do nothing if the threshold has not been crossed. |
| 316 |
if ((distX * distX) + (distY * distY) < (threshold * threshold)) { return; } |
| 317 |
|
| 318 |
triggerStart(e, data, touch, distX, distY, fn); |
| 319 |
} |
| 320 |
|
| 321 |
function triggerStart(e, data, touch, distX, distY, fn) { |
| 322 |
var touches = e.targetTouches; |
| 323 |
var time = e.timeStamp - data.timeStamp; |
| 324 |
|
| 325 |
// Create a movestart object with some special properties that |
| 326 |
// are passed only to the movestart handlers. |
| 327 |
var template = { |
| 328 |
altKey: e.altKey, |
| 329 |
ctrlKey: e.ctrlKey, |
| 330 |
shiftKey: e.shiftKey, |
| 331 |
startX: data.pageX, |
| 332 |
startY: data.pageY, |
| 333 |
distX: distX, |
| 334 |
distY: distY, |
| 335 |
deltaX: distX, |
| 336 |
deltaY: distY, |
| 337 |
pageX: touch.pageX, |
| 338 |
pageY: touch.pageY, |
| 339 |
velocityX: distX / time, |
| 340 |
velocityY: distY / time, |
| 341 |
identifier: data.identifier, |
| 342 |
targetTouches: touches, |
| 343 |
finger: touches ? touches.length : 1, |
| 344 |
enableMove: function() { |
| 345 |
this.moveEnabled = true; |
| 346 |
this.enableMove = noop; |
| 347 |
e.preventDefault(); |
| 348 |
} |
| 349 |
}; |
| 350 |
|
| 351 |
// Trigger the movestart event. |
| 352 |
trigger(data.target, 'movestart', template); |
| 353 |
|
| 354 |
// Unbind handlers that tracked the touch or mouse up till now. |
| 355 |
fn(data); |
| 356 |
} |
| 357 |
|
| 358 |
|
| 359 |
// Handlers that control what happens following a movestart |
| 360 |
|
| 361 |
function activeMousemove(e, data) { |
| 362 |
var timer = data.timer; |
| 363 |
|
| 364 |
data.touch = e; |
| 365 |
data.timeStamp = e.timeStamp; |
| 366 |
timer.kick(); |
| 367 |
} |
| 368 |
|
| 369 |
function activeMouseend(e, data) { |
| 370 |
var target = data.target; |
| 371 |
var event = data.event; |
| 372 |
var timer = data.timer; |
| 373 |
|
| 374 |
removeActiveMouse(); |
| 375 |
|
| 376 |
endEvent(target, event, timer, function() { |
| 377 |
// Unbind the click suppressor, waiting until after mouseup |
| 378 |
// has been handled. |
| 379 |
setTimeout(function(){ |
| 380 |
off(target, 'click', preventDefault); |
| 381 |
}, 0); |
| 382 |
}); |
| 383 |
} |
| 384 |
|
| 385 |
function removeActiveMouse() { |
| 386 |
off(document, mouseevents.move, activeMousemove); |
| 387 |
off(document, mouseevents.end, activeMouseend); |
| 388 |
} |
| 389 |
|
| 390 |
function activeTouchmove(e, data) { |
| 391 |
var event = data.event; |
| 392 |
var timer = data.timer; |
| 393 |
var touch = changedTouch(e, event); |
| 394 |
|
| 395 |
if (!touch) { return; } |
| 396 |
|
| 397 |
// Stop the interface from gesturing |
| 398 |
e.preventDefault(); |
| 399 |
|
| 400 |
event.targetTouches = e.targetTouches; |
| 401 |
data.touch = touch; |
| 402 |
data.timeStamp = e.timeStamp; |
| 403 |
|
| 404 |
timer.kick(); |
| 405 |
} |
| 406 |
|
| 407 |
function activeTouchend(e, data) { |
| 408 |
var target = data.target; |
| 409 |
var event = data.event; |
| 410 |
var timer = data.timer; |
| 411 |
var touch = identifiedTouch(e.changedTouches, event.identifier); |
| 412 |
|
| 413 |
// This isn't the touch you're looking for. |
| 414 |
if (!touch) { return; } |
| 415 |
|
| 416 |
removeActiveTouch(data); |
| 417 |
endEvent(target, event, timer); |
| 418 |
} |
| 419 |
|
| 420 |
function removeActiveTouch(data) { |
| 421 |
off(document, touchevents.move, data.activeTouchmove); |
| 422 |
off(document, touchevents.end, data.activeTouchend); |
| 423 |
} |
| 424 |
|
| 425 |
|
| 426 |
// Logic for triggering move and moveend events |
| 427 |
|
| 428 |
function updateEvent(event, touch, timeStamp) { |
| 429 |
var time = timeStamp - event.timeStamp; |
| 430 |
|
| 431 |
event.distX = touch.pageX - event.startX; |
| 432 |
event.distY = touch.pageY - event.startY; |
| 433 |
event.deltaX = touch.pageX - event.pageX; |
| 434 |
event.deltaY = touch.pageY - event.pageY; |
| 435 |
|
| 436 |
// Average the velocity of the last few events using a decay |
| 437 |
// curve to even out spurious jumps in values. |
| 438 |
event.velocityX = 0.3 * event.velocityX + 0.7 * event.deltaX / time; |
| 439 |
event.velocityY = 0.3 * event.velocityY + 0.7 * event.deltaY / time; |
| 440 |
event.pageX = touch.pageX; |
| 441 |
event.pageY = touch.pageY; |
| 442 |
} |
| 443 |
|
| 444 |
function endEvent(target, event, timer, fn) { |
| 445 |
timer.end(function(){ |
| 446 |
trigger(target, 'moveend', event); |
| 447 |
return fn && fn(); |
| 448 |
}); |
| 449 |
} |
| 450 |
|
| 451 |
|
| 452 |
// Set up the DOM |
| 453 |
|
| 454 |
function movestart(e) { |
| 455 |
if (e.defaultPrevented) { return; } |
| 456 |
if (!e.moveEnabled) { return; } |
| 457 |
|
| 458 |
var event = { |
| 459 |
startX: e.startX, |
| 460 |
startY: e.startY, |
| 461 |
pageX: e.pageX, |
| 462 |
pageY: e.pageY, |
| 463 |
distX: e.distX, |
| 464 |
distY: e.distY, |
| 465 |
deltaX: e.deltaX, |
| 466 |
deltaY: e.deltaY, |
| 467 |
velocityX: e.velocityX, |
| 468 |
velocityY: e.velocityY, |
| 469 |
identifier: e.identifier, |
| 470 |
targetTouches: e.targetTouches, |
| 471 |
finger: e.finger |
| 472 |
}; |
| 473 |
|
| 474 |
var data = { |
| 475 |
target: e.target, |
| 476 |
event: event, |
| 477 |
timer: new Timer(update), |
| 478 |
touch: undefined, |
| 479 |
timeStamp: e.timeStamp |
| 480 |
}; |
| 481 |
|
| 482 |
function update(time) { |
| 483 |
updateEvent(event, data.touch, data.timeStamp); |
| 484 |
trigger(data.target, 'move', event); |
| 485 |
} |
| 486 |
|
| 487 |
if (e.identifier === undefined) { |
| 488 |
// We're dealing with a mouse event. |
| 489 |
// Stop clicks from propagating during a move |
| 490 |
on(e.target, 'click', preventDefault); |
| 491 |
on(document, mouseevents.move, activeMousemove, data); |
| 492 |
on(document, mouseevents.end, activeMouseend, data); |
| 493 |
} |
| 494 |
else { |
| 495 |
// In order to unbind correct handlers they have to be unique |
| 496 |
data.activeTouchmove = function(e, data) { activeTouchmove(e, data); }; |
| 497 |
data.activeTouchend = function(e, data) { activeTouchend(e, data); }; |
| 498 |
|
| 499 |
// We're dealing with a touch. |
| 500 |
on(document, touchevents.move, data.activeTouchmove, data); |
| 501 |
on(document, touchevents.end, data.activeTouchend, data); |
| 502 |
} |
| 503 |
} |
| 504 |
|
| 505 |
on(document, 'mousedown', mousedown); |
| 506 |
on(document, 'touchstart', touchstart); |
| 507 |
on(document, 'movestart', movestart); |
| 508 |
|
| 509 |
|
| 510 |
// jQuery special events |
| 511 |
// |
| 512 |
// jQuery event objects are copies of DOM event objects. They need |
| 513 |
// a little help copying the move properties across. |
| 514 |
|
| 515 |
if (!window.jQuery) { return; } |
| 516 |
|
| 517 |
var properties = ("startX startY pageX pageY distX distY deltaX deltaY velocityX velocityY").split(' '); |
| 518 |
|
| 519 |
function enableMove1(e) { e.enableMove(); } |
| 520 |
function enableMove2(e) { e.enableMove(); } |
| 521 |
function enableMove3(e) { e.enableMove(); } |
| 522 |
|
| 523 |
function add(handleObj) { |
| 524 |
var handler = handleObj.handler; |
| 525 |
|
| 526 |
handleObj.handler = function(e) { |
| 527 |
// Copy move properties across from originalEvent |
| 528 |
var i = properties.length; |
| 529 |
var property; |
| 530 |
|
| 531 |
while(i--) { |
| 532 |
property = properties[i]; |
| 533 |
e[property] = e.originalEvent[property]; |
| 534 |
} |
| 535 |
|
| 536 |
handler.apply(this, arguments); |
| 537 |
}; |
| 538 |
} |
| 539 |
|
| 540 |
jQuery.event.special.movestart = { |
| 541 |
setup: function() { |
| 542 |
// Movestart must be enabled to allow other move events |
| 543 |
on(this, 'movestart', enableMove1); |
| 544 |
|
| 545 |
// Do listen to DOM events |
| 546 |
return false; |
| 547 |
}, |
| 548 |
|
| 549 |
teardown: function() { |
| 550 |
off(this, 'movestart', enableMove1); |
| 551 |
return false; |
| 552 |
}, |
| 553 |
|
| 554 |
add: add |
| 555 |
}; |
| 556 |
|
| 557 |
jQuery.event.special.move = { |
| 558 |
setup: function() { |
| 559 |
on(this, 'movestart', enableMove2); |
| 560 |
return false; |
| 561 |
}, |
| 562 |
|
| 563 |
teardown: function() { |
| 564 |
off(this, 'movestart', enableMove2); |
| 565 |
return false; |
| 566 |
}, |
| 567 |
|
| 568 |
add: add |
| 569 |
}; |
| 570 |
|
| 571 |
jQuery.event.special.moveend = { |
| 572 |
setup: function() { |
| 573 |
on(this, 'movestart', enableMove3); |
| 574 |
return false; |
| 575 |
}, |
| 576 |
|
| 577 |
teardown: function() { |
| 578 |
off(this, 'movestart', enableMove3); |
| 579 |
return false; |
| 580 |
}, |
| 581 |
|
| 582 |
add: add |
| 583 |
}; |
| 584 |
}); |
| 585 |
|
