| 1 |
// jquery.event.move |
| 2 |
// |
| 3 |
// 1.3.6 |
| 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 (module) { |
| 26 |
if (typeof define === 'function' && define.amd) { |
| 27 |
// AMD. Register as an anonymous module. |
| 28 |
define(['jquery'], module); |
| 29 |
} else { |
| 30 |
// Browser globals |
| 31 |
module(jQuery); |
| 32 |
} |
| 33 |
})(function(jQuery, undefined){ |
| 34 |
|
| 35 |
var // Number of pixels a pressed pointer travels before movestart |
| 36 |
// event is fired. |
| 37 |
threshold = 6, |
| 38 |
|
| 39 |
add = jQuery.event.add, |
| 40 |
|
| 41 |
remove = jQuery.event.remove, |
| 42 |
|
| 43 |
// Just sugar, so we can have arguments in the same order as |
| 44 |
// add and remove. |
| 45 |
trigger = function(node, type, data) { |
| 46 |
jQuery.event.trigger(type, data, node); |
| 47 |
}, |
| 48 |
|
| 49 |
// Shim for requestAnimationFrame, falling back to timer. See: |
| 50 |
// see http://paulirish.com/2011/requestanimationframe-for-smart-animating/ |
| 51 |
requestFrame = (function(){ |
| 52 |
return ( |
| 53 |
window.requestAnimationFrame || |
| 54 |
window.webkitRequestAnimationFrame || |
| 55 |
window.mozRequestAnimationFrame || |
| 56 |
window.oRequestAnimationFrame || |
| 57 |
window.msRequestAnimationFrame || |
| 58 |
function(fn, element){ |
| 59 |
return window.setTimeout(function(){ |
| 60 |
fn(); |
| 61 |
}, 25); |
| 62 |
} |
| 63 |
); |
| 64 |
})(), |
| 65 |
|
| 66 |
ignoreTags = { |
| 67 |
textarea: true, |
| 68 |
input: true, |
| 69 |
select: true, |
| 70 |
button: true |
| 71 |
}, |
| 72 |
|
| 73 |
mouseevents = { |
| 74 |
move: 'mousemove', |
| 75 |
cancel: 'mouseup dragstart', |
| 76 |
end: 'mouseup' |
| 77 |
}, |
| 78 |
|
| 79 |
touchevents = { |
| 80 |
move: 'touchmove', |
| 81 |
cancel: 'touchend', |
| 82 |
end: 'touchend' |
| 83 |
}; |
| 84 |
|
| 85 |
|
| 86 |
// Constructors |
| 87 |
|
| 88 |
function Timer(fn){ |
| 89 |
var callback = fn, |
| 90 |
active = false, |
| 91 |
running = false; |
| 92 |
|
| 93 |
function trigger(time) { |
| 94 |
if (active){ |
| 95 |
callback(); |
| 96 |
requestFrame(trigger); |
| 97 |
running = true; |
| 98 |
active = false; |
| 99 |
} |
| 100 |
else { |
| 101 |
running = false; |
| 102 |
} |
| 103 |
} |
| 104 |
|
| 105 |
this.kick = function(fn) { |
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active = true; |
| 107 |
if (!running) { trigger(); } |
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}; |
| 109 |
|
| 110 |
this.end = function(fn) { |
| 111 |
var cb = callback; |
| 112 |
|
| 113 |
if (!fn) { return; } |
| 114 |
|
| 115 |
// If the timer is not running, simply call the end callback. |
| 116 |
if (!running) { |
| 117 |
fn(); |
| 118 |
} |
| 119 |
// If the timer is running, and has been kicked lately, then |
| 120 |
// queue up the current callback and the end callback, otherwise |
| 121 |
// just the end callback. |
| 122 |
else { |
| 123 |
callback = active ? |
| 124 |
function(){ cb(); fn(); } : |
| 125 |
fn ; |
| 126 |
|
| 127 |
active = true; |
| 128 |
} |
| 129 |
}; |
| 130 |
} |
| 131 |
|
| 132 |
|
| 133 |
// Functions |
| 134 |
|
| 135 |
function returnTrue() { |
| 136 |
return true; |
| 137 |
} |
| 138 |
|
| 139 |
function returnFalse() { |
| 140 |
return false; |
| 141 |
} |
| 142 |
|
| 143 |
function preventDefault(e) { |
| 144 |
e.preventDefault(); |
| 145 |
} |
| 146 |
|
| 147 |
function preventIgnoreTags(e) { |
| 148 |
// Don't prevent interaction with form elements. |
| 149 |
if (ignoreTags[ e.target.tagName.toLowerCase() ]) { return; } |
| 150 |
|
| 151 |
e.preventDefault(); |
| 152 |
} |
| 153 |
|
| 154 |
function isLeftButton(e) { |
| 155 |
// Ignore mousedowns on any button other than the left (or primary) |
| 156 |
// mouse button, or when a modifier key is pressed. |
| 157 |
return (e.which === 1 && !e.ctrlKey && !e.altKey); |
| 158 |
} |
| 159 |
|
| 160 |
function identifiedTouch(touchList, id) { |
| 161 |
var i, l; |
| 162 |
|
| 163 |
if (touchList.identifiedTouch) { |
| 164 |
return touchList.identifiedTouch(id); |
| 165 |
} |
| 166 |
|
| 167 |
// touchList.identifiedTouch() does not exist in |
| 168 |
// webkit yet… we must do the search ourselves... |
| 169 |
|
| 170 |
i = -1; |
| 171 |
l = touchList.length; |
| 172 |
|
| 173 |
while (++i < l) { |
| 174 |
if (touchList[i].identifier === id) { |
| 175 |
return touchList[i]; |
| 176 |
} |
| 177 |
} |
| 178 |
} |
| 179 |
|
| 180 |
function changedTouch(e, event) { |
| 181 |
var touch = identifiedTouch(e.changedTouches, event.identifier); |
| 182 |
|
| 183 |
// This isn't the touch you're looking for. |
| 184 |
if (!touch) { return; } |
| 185 |
|
| 186 |
// Chrome Android (at least) includes touches that have not |
| 187 |
// changed in e.changedTouches. That's a bit annoying. Check |
| 188 |
// that this touch has changed. |
| 189 |
if (touch.pageX === event.pageX && touch.pageY === event.pageY) { return; } |
| 190 |
|
| 191 |
return touch; |
| 192 |
} |
| 193 |
|
| 194 |
|
| 195 |
// Handlers that decide when the first movestart is triggered |
| 196 |
|
| 197 |
function mousedown(e){ |
| 198 |
var data; |
| 199 |
|
| 200 |
if (!isLeftButton(e)) { return; } |
| 201 |
|
| 202 |
data = { |
| 203 |
target: e.target, |
| 204 |
startX: e.pageX, |
| 205 |
startY: e.pageY, |
| 206 |
timeStamp: e.timeStamp |
| 207 |
}; |
| 208 |
|
| 209 |
add(document, mouseevents.move, mousemove, data); |
| 210 |
add(document, mouseevents.cancel, mouseend, data); |
| 211 |
} |
| 212 |
|
| 213 |
function mousemove(e){ |
| 214 |
var data = e.data; |
| 215 |
|
| 216 |
checkThreshold(e, data, e, removeMouse); |
| 217 |
} |
| 218 |
|
| 219 |
function mouseend(e) { |
| 220 |
removeMouse(); |
| 221 |
} |
| 222 |
|
| 223 |
function removeMouse() { |
| 224 |
remove(document, mouseevents.move, mousemove); |
| 225 |
remove(document, mouseevents.cancel, mouseend); |
| 226 |
} |
| 227 |
|
| 228 |
function touchstart(e) { |
| 229 |
var touch, template; |
| 230 |
|
| 231 |
// Don't get in the way of interaction with form elements. |
| 232 |
if (ignoreTags[ e.target.tagName.toLowerCase() ]) { return; } |
| 233 |
|
| 234 |
touch = e.changedTouches[0]; |
| 235 |
|
| 236 |
// iOS live updates the touch objects whereas Android gives us copies. |
| 237 |
// That means we can't trust the touchstart object to stay the same, |
| 238 |
// so we must copy the data. This object acts as a template for |
| 239 |
// movestart, move and moveend event objects. |
| 240 |
template = { |
| 241 |
target: touch.target, |
| 242 |
startX: touch.pageX, |
| 243 |
startY: touch.pageY, |
| 244 |
timeStamp: e.timeStamp, |
| 245 |
identifier: touch.identifier |
| 246 |
}; |
| 247 |
|
| 248 |
// Use the touch identifier as a namespace, so that we can later |
| 249 |
// remove handlers pertaining only to this touch. |
| 250 |
add(document, touchevents.move + '.' + touch.identifier, touchmove, template); |
| 251 |
add(document, touchevents.cancel + '.' + touch.identifier, touchend, template); |
| 252 |
} |
| 253 |
|
| 254 |
function touchmove(e){ |
| 255 |
var data = e.data, |
| 256 |
touch = changedTouch(e, data); |
| 257 |
|
| 258 |
if (!touch) { return; } |
| 259 |
|
| 260 |
checkThreshold(e, data, touch, removeTouch); |
| 261 |
} |
| 262 |
|
| 263 |
function touchend(e) { |
| 264 |
var template = e.data, |
| 265 |
touch = identifiedTouch(e.changedTouches, template.identifier); |
| 266 |
|
| 267 |
if (!touch) { return; } |
| 268 |
|
| 269 |
removeTouch(template.identifier); |
| 270 |
} |
| 271 |
|
| 272 |
function removeTouch(identifier) { |
| 273 |
remove(document, '.' + identifier, touchmove); |
| 274 |
remove(document, '.' + identifier, touchend); |
| 275 |
} |
| 276 |
|
| 277 |
|
| 278 |
// Logic for deciding when to trigger a movestart. |
| 279 |
|
| 280 |
function checkThreshold(e, template, touch, fn) { |
| 281 |
var distX = touch.pageX - template.startX, |
| 282 |
distY = touch.pageY - template.startY; |
| 283 |
|
| 284 |
// Do nothing if the threshold has not been crossed. |
| 285 |
if ((distX * distX) + (distY * distY) < (threshold * threshold)) { return; } |
| 286 |
|
| 287 |
triggerStart(e, template, touch, distX, distY, fn); |
| 288 |
} |
| 289 |
|
| 290 |
function handled() { |
| 291 |
// this._handled should return false once, and after return true. |
| 292 |
this._handled = returnTrue; |
| 293 |
return false; |
| 294 |
} |
| 295 |
|
| 296 |
function flagAsHandled(e) { |
| 297 |
e._handled(); |
| 298 |
} |
| 299 |
|
| 300 |
function triggerStart(e, template, touch, distX, distY, fn) { |
| 301 |
var node = template.target, |
| 302 |
touches, time; |
| 303 |
|
| 304 |
touches = e.targetTouches; |
| 305 |
time = e.timeStamp - template.timeStamp; |
| 306 |
|
| 307 |
// Create a movestart object with some special properties that |
| 308 |
// are passed only to the movestart handlers. |
| 309 |
template.type = 'movestart'; |
| 310 |
template.distX = distX; |
| 311 |
template.distY = distY; |
| 312 |
template.deltaX = distX; |
| 313 |
template.deltaY = distY; |
| 314 |
template.pageX = touch.pageX; |
| 315 |
template.pageY = touch.pageY; |
| 316 |
template.velocityX = distX / time; |
| 317 |
template.velocityY = distY / time; |
| 318 |
template.targetTouches = touches; |
| 319 |
template.finger = touches ? |
| 320 |
touches.length : |
| 321 |
1 ; |
| 322 |
|
| 323 |
// The _handled method is fired to tell the default movestart |
| 324 |
// handler that one of the move events is bound. |
| 325 |
template._handled = handled; |
| 326 |
|
| 327 |
// Pass the touchmove event so it can be prevented if or when |
| 328 |
// movestart is handled. |
| 329 |
template._preventTouchmoveDefault = function() { |
| 330 |
e.preventDefault(); |
| 331 |
}; |
| 332 |
|
| 333 |
// Trigger the movestart event. |
| 334 |
trigger(template.target, template); |
| 335 |
|
| 336 |
// Unbind handlers that tracked the touch or mouse up till now. |
| 337 |
fn(template.identifier); |
| 338 |
} |
| 339 |
|
| 340 |
|
| 341 |
// Handlers that control what happens following a movestart |
| 342 |
|
| 343 |
function activeMousemove(e) { |
| 344 |
var timer = e.data.timer; |
| 345 |
|
| 346 |
e.data.touch = e; |
| 347 |
e.data.timeStamp = e.timeStamp; |
| 348 |
timer.kick(); |
| 349 |
} |
| 350 |
|
| 351 |
function activeMouseend(e) { |
| 352 |
var event = e.data.event, |
| 353 |
timer = e.data.timer; |
| 354 |
|
| 355 |
removeActiveMouse(); |
| 356 |
|
| 357 |
endEvent(event, timer, function() { |
| 358 |
// Unbind the click suppressor, waiting until after mouseup |
| 359 |
// has been handled. |
| 360 |
setTimeout(function(){ |
| 361 |
remove(event.target, 'click', returnFalse); |
| 362 |
}, 0); |
| 363 |
}); |
| 364 |
} |
| 365 |
|
| 366 |
function removeActiveMouse(event) { |
| 367 |
remove(document, mouseevents.move, activeMousemove); |
| 368 |
remove(document, mouseevents.end, activeMouseend); |
| 369 |
} |
| 370 |
|
| 371 |
function activeTouchmove(e) { |
| 372 |
var event = e.data.event, |
| 373 |
timer = e.data.timer, |
| 374 |
touch = changedTouch(e, event); |
| 375 |
|
| 376 |
if (!touch) { return; } |
| 377 |
|
| 378 |
// Stop the interface from gesturing |
| 379 |
e.preventDefault(); |
| 380 |
|
| 381 |
event.targetTouches = e.targetTouches; |
| 382 |
e.data.touch = touch; |
| 383 |
e.data.timeStamp = e.timeStamp; |
| 384 |
timer.kick(); |
| 385 |
} |
| 386 |
|
| 387 |
function activeTouchend(e) { |
| 388 |
var event = e.data.event, |
| 389 |
timer = e.data.timer, |
| 390 |
touch = identifiedTouch(e.changedTouches, event.identifier); |
| 391 |
|
| 392 |
// This isn't the touch you're looking for. |
| 393 |
if (!touch) { return; } |
| 394 |
|
| 395 |
removeActiveTouch(event); |
| 396 |
endEvent(event, timer); |
| 397 |
} |
| 398 |
|
| 399 |
function removeActiveTouch(event) { |
| 400 |
remove(document, '.' + event.identifier, activeTouchmove); |
| 401 |
remove(document, '.' + event.identifier, activeTouchend); |
| 402 |
} |
| 403 |
|
| 404 |
|
| 405 |
// Logic for triggering move and moveend events |
| 406 |
|
| 407 |
function updateEvent(event, touch, timeStamp, timer) { |
| 408 |
var time = timeStamp - event.timeStamp; |
| 409 |
|
| 410 |
event.type = 'move'; |
| 411 |
event.distX = touch.pageX - event.startX; |
| 412 |
event.distY = touch.pageY - event.startY; |
| 413 |
event.deltaX = touch.pageX - event.pageX; |
| 414 |
event.deltaY = touch.pageY - event.pageY; |
| 415 |
|
| 416 |
// Average the velocity of the last few events using a decay |
| 417 |
// curve to even out spurious jumps in values. |
| 418 |
event.velocityX = 0.3 * event.velocityX + 0.7 * event.deltaX / time; |
| 419 |
event.velocityY = 0.3 * event.velocityY + 0.7 * event.deltaY / time; |
| 420 |
event.pageX = touch.pageX; |
| 421 |
event.pageY = touch.pageY; |
| 422 |
} |
| 423 |
|
| 424 |
function endEvent(event, timer, fn) { |
| 425 |
timer.end(function(){ |
| 426 |
event.type = 'moveend'; |
| 427 |
|
| 428 |
trigger(event.target, event); |
| 429 |
|
| 430 |
return fn && fn(); |
| 431 |
}); |
| 432 |
} |
| 433 |
|
| 434 |
|
| 435 |
// jQuery special event definition |
| 436 |
|
| 437 |
function setup(data, namespaces, eventHandle) { |
| 438 |
// Stop the node from being dragged |
| 439 |
//add(this, 'dragstart.move drag.move', preventDefault); |
| 440 |
|
| 441 |
// Prevent text selection and touch interface scrolling |
| 442 |
//add(this, 'mousedown.move', preventIgnoreTags); |
| 443 |
|
| 444 |
// Tell movestart default handler that we've handled this |
| 445 |
add(this, 'movestart.move', flagAsHandled); |
| 446 |
|
| 447 |
// Don't bind to the DOM. For speed. |
| 448 |
return true; |
| 449 |
} |
| 450 |
|
| 451 |
function teardown(namespaces) { |
| 452 |
remove(this, 'dragstart drag', preventDefault); |
| 453 |
remove(this, 'mousedown touchstart', preventIgnoreTags); |
| 454 |
remove(this, 'movestart', flagAsHandled); |
| 455 |
|
| 456 |
// Don't bind to the DOM. For speed. |
| 457 |
return true; |
| 458 |
} |
| 459 |
|
| 460 |
function addMethod(handleObj) { |
| 461 |
// We're not interested in preventing defaults for handlers that |
| 462 |
// come from internal move or moveend bindings |
| 463 |
if (handleObj.namespace === "move" || handleObj.namespace === "moveend") { |
| 464 |
return; |
| 465 |
} |
| 466 |
|
| 467 |
// Stop the node from being dragged |
| 468 |
add(this, 'dragstart.' + handleObj.guid + ' drag.' + handleObj.guid, preventDefault, undefined, handleObj.selector); |
| 469 |
|
| 470 |
// Prevent text selection and touch interface scrolling |
| 471 |
add(this, 'mousedown.' + handleObj.guid, preventIgnoreTags, undefined, handleObj.selector); |
| 472 |
} |
| 473 |
|
| 474 |
function removeMethod(handleObj) { |
| 475 |
if (handleObj.namespace === "move" || handleObj.namespace === "moveend") { |
| 476 |
return; |
| 477 |
} |
| 478 |
|
| 479 |
remove(this, 'dragstart.' + handleObj.guid + ' drag.' + handleObj.guid); |
| 480 |
remove(this, 'mousedown.' + handleObj.guid); |
| 481 |
} |
| 482 |
|
| 483 |
jQuery.event.special.movestart = { |
| 484 |
setup: setup, |
| 485 |
teardown: teardown, |
| 486 |
add: addMethod, |
| 487 |
remove: removeMethod, |
| 488 |
|
| 489 |
_default: function(e) { |
| 490 |
var event, data; |
| 491 |
|
| 492 |
// If no move events were bound to any ancestors of this |
| 493 |
// target, high tail it out of here. |
| 494 |
if (!e._handled()) { return; } |
| 495 |
|
| 496 |
function update(time) { |
| 497 |
updateEvent(event, data.touch, data.timeStamp); |
| 498 |
trigger(e.target, event); |
| 499 |
} |
| 500 |
|
| 501 |
event = { |
| 502 |
target: e.target, |
| 503 |
startX: e.startX, |
| 504 |
startY: e.startY, |
| 505 |
pageX: e.pageX, |
| 506 |
pageY: e.pageY, |
| 507 |
distX: e.distX, |
| 508 |
distY: e.distY, |
| 509 |
deltaX: e.deltaX, |
| 510 |
deltaY: e.deltaY, |
| 511 |
velocityX: e.velocityX, |
| 512 |
velocityY: e.velocityY, |
| 513 |
timeStamp: e.timeStamp, |
| 514 |
identifier: e.identifier, |
| 515 |
targetTouches: e.targetTouches, |
| 516 |
finger: e.finger |
| 517 |
}; |
| 518 |
|
| 519 |
data = { |
| 520 |
event: event, |
| 521 |
timer: new Timer(update), |
| 522 |
touch: undefined, |
| 523 |
timeStamp: undefined |
| 524 |
}; |
| 525 |
|
| 526 |
if (e.identifier === undefined) { |
| 527 |
// We're dealing with a mouse |
| 528 |
// Stop clicks from propagating during a move |
| 529 |
add(e.target, 'click', returnFalse); |
| 530 |
add(document, mouseevents.move, activeMousemove, data); |
| 531 |
add(document, mouseevents.end, activeMouseend, data); |
| 532 |
} |
| 533 |
else { |
| 534 |
// We're dealing with a touch. Stop touchmove doing |
| 535 |
// anything defaulty. |
| 536 |
e._preventTouchmoveDefault(); |
| 537 |
add(document, touchevents.move + '.' + e.identifier, activeTouchmove, data); |
| 538 |
add(document, touchevents.end + '.' + e.identifier, activeTouchend, data); |
| 539 |
} |
| 540 |
} |
| 541 |
}; |
| 542 |
|
| 543 |
jQuery.event.special.move = { |
| 544 |
setup: function() { |
| 545 |
// Bind a noop to movestart. Why? It's the movestart |
| 546 |
// setup that decides whether other move events are fired. |
| 547 |
add(this, 'movestart.move', jQuery.noop); |
| 548 |
}, |
| 549 |
|
| 550 |
teardown: function() { |
| 551 |
remove(this, 'movestart.move', jQuery.noop); |
| 552 |
} |
| 553 |
}; |
| 554 |
|
| 555 |
jQuery.event.special.moveend = { |
| 556 |
setup: function() { |
| 557 |
// Bind a noop to movestart. Why? It's the movestart |
| 558 |
// setup that decides whether other move events are fired. |
| 559 |
add(this, 'movestart.moveend', jQuery.noop); |
| 560 |
}, |
| 561 |
|
| 562 |
teardown: function() { |
| 563 |
remove(this, 'movestart.moveend', jQuery.noop); |
| 564 |
} |
| 565 |
}; |
| 566 |
|
| 567 |
add(document, 'mousedown.move', mousedown); |
| 568 |
add(document, 'touchstart.move', touchstart); |
| 569 |
|
| 570 |
// Make jQuery copy touch event properties over to the jQuery event |
| 571 |
// object, if they are not already listed. But only do the ones we |
| 572 |
// really need. IE7/8 do not have Array#indexOf(), but nor do they |
| 573 |
// have touch events, so let's assume we can ignore them. |
| 574 |
if (typeof Array.prototype.indexOf === 'function') { |
| 575 |
(function(jQuery, undefined){ |
| 576 |
var props = ["changedTouches", "targetTouches"], |
| 577 |
l = props.length; |
| 578 |
|
| 579 |
while (l--) { |
| 580 |
if (jQuery.event.props.indexOf(props[l]) === -1) { |
| 581 |
jQuery.event.props.push(props[l]); |
| 582 |
} |
| 583 |
} |
| 584 |
})(jQuery); |
| 585 |
}; |
| 586 |
}); |
| 587 |
|
