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jquery.touchy.js
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jquery.touchy.js
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/* Touchy : a jQuery plugin for managing touch events in Webkit
*
* version: 1.0
*
* requires jQuery 1.4.2+
*/
(function($){
// public jQuery properties
$.touchyOptions = {
useDelegation: false,
/*
* To be implemented
*
press: { // the user touches the element before further interaction. maybe abstracts touchstart and mousedown?
requiredTouches: 1,
data: {},
proxyEvents: [TouchStart, TouchEnd]
},
contact: { // the user touches the element at any time during the interaction. could fire mouseenter as well as its own event, if configured to do so?
requiredTouches: 1,
triggerMouseEnter: false,
data: {},
proxyEvents: [TouchStart, TouchMove, TouchEnd]
},
tap: { // the user taps briefly on the element as the only interaction. can interrelate with doubletap.
requiredTouches: 1,
msThreshTap: 200,
data: {},
proxyEvents: [TouchStart, TouchEnd]
},
dbltap: { // the user taps twice within a short period of time on the element as the only interaction.
requiredTouches: 1,
msThreshTap: 200,
msThreshDouble: 500,
data: {},
proxyEvents: [TouchStart, TouchEnd]
},
*/
longpress: { // the user touches the element and hold his or her finger on the element for a specifed amount of time.
requiredTouches: 1,
msThresh: 800,
triggerStartPhase: false,
data: {
startDate: null
},
proxyEvents: ["TouchStart", "TouchEnd"]
},
drag: { // the user touches the element and then moves his or her finger across the screen
requiredTouches: 1,
msHoldThresh: 100,
data: {
startPoint: null,
startDate: null,
movePoint: null,
moveDate: null,
held: false
},
proxyEvents: ["TouchStart", "TouchMove", "TouchEnd"]
},
pinch: { // the user puts two fingers on the element and then either increases or decreases the distance between them.
pxThresh: 0,
data: {
startPoint: null,
startDate: null,
movePoint: null,
moveDate: null
},
proxyEvents: ["TouchStart", "TouchMove", "GestureChange", "TouchEnd"]
},
rotate: { // the user attempts to rotate the element within the x/y plane. may require one or two fingers.
requiredTouches: 1,
data: {},
proxyEvents: ["TouchStart", "TouchMove", "GestureChange", "TouchEnd"]
},
swipe: { // the user touches the screen, then rapidly drags his or her finger(s), then stops touching the screen, all in a "flicking" or "swiping" motion. may require up to four fingers.
requiredTouches: 1,
velocityThresh: 1,
triggerOn: "touchmove",
data: {
startPoint: null,
startDate: null,
movePoint: null,
moveDate: null
},
proxyEvents: ["TouchStart", "TouchMove", "TouchEnd"]
}
};
// private proxy event handlers
var proxyHandlers = {
handleTouchStart: function (e) {
var eventType = this.context,
$target = getTarget(e, eventType);
if ($target) {
var event = e.originalEvent,
touches = event.targetTouches,
data;
event.preventDefault();
switch (this.context) {
//////////////// DRAG ////////////////
case 'drag':
data = $target.data('touchyDrag');
if (touches.length === data.settings.requiredTouches) {
updateDragData(data, touches, e.timeStamp);
var startPoint = data.startPoint;
$target.trigger('touchy-drag', ['start', $target, {
"movePoint": startPoint,
"lastMovePoint": startPoint,
"startPoint": startPoint,
"velocity": 0
}]);
}
break;
//////////////// SWIPE ////////////////
case 'swipe':
data = $target.data('touchySwipe');
if (touches.length === data.settings.requiredTouches) {
updateSwipeData(data, touches, e.timeStamp);
}
break;
//////////////// PINCH ////////////////
case 'pinch':
data = $target.data('touchyPinch');
var points = getTwoTouchPointData(e);
if(points){
data.startPoint = {
"x": points.centerX,
"y": points.centerY
}
data.startDistance = Math.sqrt( Math.pow( (points.x2 - points.x1), 2 ) + Math.pow( (points.y2 - points.y1), 2 ) );
}
break;
//////////////// LONGPRESS ////////////////
case 'longpress':
data = $target.data('touchyLongpress');
if (touches.length === data.settings.requiredTouches) {
data.startPoint = {
"x": touches[0].pageX,
"y": touches[0].pageY
};
data.startDate = e.timeStamp;
if (data.settings.triggerStartPhase) {
$target.trigger('touchy-longpress', ['start', $target]);
}
data.timer = setTimeout($.proxy(function(){
$target.trigger('touchy-longpress', ['end', $target]);
}, this), data.settings.msThresh);
}
break;
//////////////// ROTATE ////////////////
case 'rotate':
data = $target.data('touchyRotate');
if (touches.length === data.settings.requiredTouches) {
if (touches.length === 1) {
ensureSingularStartData(data, touches, e.timeStamp);
}
else {
var points = getTwoTouchPointData(e);
data.startPoint = {
"x": points.centerX,
"y": points.centerY
};
data.startDate = e.timeStamp;
}
var startPoint = data.startPoint;
$target.trigger('touchy-rotate', ['start', $target, {
"startPoint": startPoint,
"movePoint": startPoint,
"lastMovePoint": startPoint,
"velocity": 0,
"degrees": 0
}]);
}
break;
}
}
},
handleTouchMove: function (e) {
var eventType = this.context,
$target = getTarget(e, eventType);
if ($target) {
var event = e.originalEvent,
touches = event.targetTouches,
data;
event.preventDefault();
switch (eventType) {
//////////////// DRAG ////////////////
case 'drag':
data = $target.data('touchyDrag');
if (touches.length === data.settings.requiredTouches) {
updateDragData(data, touches, e.timeStamp);
var movePoint = data.movePoint,
lastMovePoint = data.lastMovePoint,
distance = movePoint.x === lastMovePoint.x && movePoint.y === lastMovePoint.y ? 0 : Math.sqrt( Math.pow( (movePoint.x - lastMovePoint.x), 2 ) + Math.pow( (movePoint.y - lastMovePoint.y), 2 ) ),
ms = data.moveDate - data.lastMoveDate,
velocity = ms === 0 ? 0 : distance / ms;
if (data.held) {
$target.trigger('touchy-drag', ['move', $target, {
"movePoint": movePoint,
"lastMovePoint": lastMovePoint,
"startPoint": data.startPoint,
"velocity": velocity
}]);
}
}
break;
//////////////// SWIPE ////////////////
case 'swipe':
data = $target.data('touchySwipe');
if (touches.length === data.settings.requiredTouches) {
updateSwipeData(data, touches, e.timeStamp);
if (!data.swipeExecuted && data.swiped && data.settings.triggerOn === 'touchmove') {
data.swipeExecuted = true;
triggerSwipe(data, $target);
}
}
break;
//////////////// PINCH ////////////////
case 'pinch':
data = $target.data('touchyPinch');
var points = getTwoTouchPointData(e);
if(points){
data.currentPoint = {
"x": points.centerX,
"y": points.centerY
};
if (!hasGestureChange()) {
var moveDistance = Math.sqrt( Math.pow( (points.x2 - points.x1), 2 ) + Math.pow( (points.y2 - points.y1), 2 ) ),
previousScale = data.previousScale = data.scale || 1,
startDistance = data.startDistance,
scale = data.scale = moveDistance / startDistance,
currentDistance = scale * startDistance;
if(currentDistance > data.settings.pxThresh){
$target.trigger('touchy-pinch', [$target, {
"scale": scale,
"previousScale": previousScale,
"currentPoint": data.currentPoint,
"startPoint": data.startPoint,
"startDistance": startDistance
}]);
}
}
}
break;
//////////////// ROTATE ////////////////
case 'rotate':
data = $target.data('touchyRotate');
if (touches.length === data.settings.requiredTouches) {
var lastMovePoint,
lastMoveDate,
movePoint,
moveDate,
lastMoveDate,
distance,
ms,
velocity,
targetPageCoords,
centerCoords,
radians,
degrees,
lastDegrees,
degreeDelta;
lastMovePoint = data.lastMovePoint = data.movePoint || data.startPoint;
lastMoveDate = data.lastMoveDate = data.moveDate || data.startDate;
movePoint = data.movePoint = {
"x": touches[0].pageX,
"y": touches[0].pageY
};
moveDate = data.moveDate = e.timeStamp;
if (touches.length === 1) {
targetPageCoords = data.targetPageCoords = data.targetPageCoords || getViewOffset(e.target);
centerCoords = data.centerCoords = data.centerCoords || {
"x": targetPageCoords.x + ($target.width() * 0.5),
"y": targetPageCoords.y + ($target.height() * 0.5)
};
}
else {
var points = getTwoTouchPointData(e);
centerCoords = data.centerCoords = {
"x": points.centerX,
"y": points.centerY
};
if (hasGestureChange()) {
break;
}
}
radians = Math.atan2(movePoint.y - centerCoords.y, movePoint.x - centerCoords.x);
lastDegrees = data.lastDegrees = data.degrees;
degrees = data.degrees = radians * (180 / Math.PI);
degreeDelta = lastDegrees ? degrees - lastDegrees : 0;
ms = moveDate - lastMoveDate;
velocity = data.velocity = ms === 0 ? 0 : Math.abs(degreeDelta) / ms;
$target.trigger('touchy-rotate', ['move', $target, {
"startPoint": data.startPoint,
"startDate": data.startDate,
"movePoint": movePoint,
"lastMovePoint": lastMovePoint,
"centerCoords": centerCoords,
"degrees": degrees,
"degreeDelta": degreeDelta,
"velocity": velocity
}]);
}
break;
}
}
},
handleGestureChange: function (e) {
var eventType = this.context,
$target = getTarget(e, eventType);
if ($target) {
var $target = $(e.target),
event = e.originalEvent,
touches = event.touches,
data;
event.preventDefault();
switch (eventType) {
//////////////// PINCH ////////////////
case 'pinch':
data = $target.data('touchyPinch');
var previousScale = data.previousScale = data.scale || 1,
scale = data.scale = event.scale,
startPoint = data.startPoint,
currentPoint = data.currentPoint || startPoint,
startDistance = data.startDistance,
currentDistance = scale * startDistance;
if(currentDistance > data.settings.pxThresh){
$target.trigger('touchy-pinch', [$target, {
"scale": scale,
"previousScale": previousScale,
"currentPoint": currentPoint,
"startPoint": startPoint,
"startDistance": startDistance
}]);
}
break;
//////////////// ROTATE ////////////////
case 'rotate':
data = $target.data('touchyRotate');
var lastDegrees = data.lastDegrees = data.degrees,
degrees = data.degrees = event.rotation,
degreeDelta = lastDegrees ? degrees - lastDegrees : 0,
ms = data.moveDate - data.lastMoveDate,
velocity = data.velocity = ms === 0 ? 0 : Math.abs(degreeDelta) / ms;
$target.trigger('touchy-rotate', ['move', $target, {
"startPoint": data.startPoint,
"startDate": data.startDate,
"movePoint": data.movePoint,
"lastMovePoint": data.lastMovePoint,
"centerCoords": data.centerCoords,
"degrees": degrees,
"degreeDelta": degreeDelta,
"velocity": velocity
}]);
break;
}
}
},
handleTouchEnd: function (e) {
var eventType = this.context,
$target = getTarget(e, eventType);
if ($target) {
var event = e.originalEvent,
data;
event.preventDefault();
switch (eventType) {
//////////////// DRAG ////////////////
case 'drag':
data = $target.data('touchyDrag');
if (data.held) {
// note: not updating data for end phase
var movePoint = data.movePoint || data.startPoint,
lastMovePoint = data.lastMovePoint || data.startPoint,
distance = movePoint.x === lastMovePoint.x && movePoint.y === lastMovePoint.y ? 0 : Math.sqrt( Math.pow( (movePoint.x - lastMovePoint.x), 2 ) + Math.pow( (movePoint.y - lastMovePoint.y), 2 ) ),
ms = data.moveDate - data.lastMoveDate,
velocity = ms === 0 ? 0 : distance / ms;
$target.trigger('touchy-drag', ['end', $target, {
"movePoint": movePoint,
"lastMovePoint": lastMovePoint,
"startPoint": data.startPoint,
"velocity": velocity
}]);
}
$.extend(data, {
"startPoint": null,
"startDate": null,
"movePoint": null,
"moveDate": null,
"lastMovePoint": null,
"lastMoveDate": null,
"held": false
});
break;
//////////////// SWIPE ////////////////
case 'swipe':
data = $target.data('touchySwipe');
// note: not updating data for end phase
if (data.swiped && data.settings.triggerOn === 'touchend') {
triggerSwipe(data, $target);
}
$.extend(data, {
"startPoint": null,
"startDate": null,
"movePoint": null,
"moveDate": null,
"lastMovePoint": null,
"lastMoveDate": null,
"swiped": false,
"swipeExecuted": false
});
break;
//////////////// PINCH ////////////////
case 'pinch':
data = $target.data('touchyPinch');
$.extend(data, {
"startPoint": null,
"startDistance": 0,
"currentPoint": null,
"pinched": false,
"scale": 1,
"previousScale": null
});
break;
//////////////// LONGPRESS ////////////////
case 'longpress':
data = $target.data('touchyLongpress');
clearTimeout(data.timer);
$.extend(data, {
"startDate":null
});
break;
//////////////// ROTATE ////////////////
case 'rotate':
data = $target.data('touchyRotate');
var degreeDelta = data.lastDegrees ? data.degrees - data.lastDegrees : 0;
$target.trigger('touchy-rotate', ['end', $target, {
"startPoint": data.startPoint,
"startDate": data.startDate,
"movePoint": data.movePoint,
"lastMovePoint": data.lastMovePoint,
"degrees": data.degrees,
"degreeDelta": degreeDelta,
"velocity": data.velocity
}]);
$.extend(data, {
"startPoint":null,
"startDate":null,
"movePoint":null,
"moveDate":null,
"lastMovePoint":null,
"lastMoveDate":null,
"targetPageCoords":null,
"centerCoords":null,
"degrees":null,
"lastDegrees":null,
"velocity":null
});
break;
}
}
}
/*
* To be implemented
*
handleTouchCancel: function (e) {
var eventType = this.context,
$target = getTarget(e, eventType);
if ($target) {
var target = e.target,
event = e.originalEvent,
touches = event.touches;
event.preventDefault();
switch (eventType) {
//////////////// DRAG ////////////////
case 'drag':
console.log('drag touchcancel');
break;
//////////////// SWIPE ////////////////
case 'swipe':
console.log('swipe touchcancel');
break;
}
}
}
*/
},
// event-specific methods
updateDragData = function (data, touches, timeStamp) {
ensureSingularStartData(data, touches, timeStamp);
var lastMoveDate = data.moveDate || data.startDate,
moveDate = timeStamp;
if ( data.held || (moveDate - lastMoveDate) > data.settings.msHoldThresh ){
$.extend(data, {
held: true,
lastMoveDate: lastMoveDate,
lastMovePoint: data.movePoint && data.movePoint.x ? data.movePoint : data.startPoint,
moveDate: moveDate,
movePoint: {
"x": touches[0].pageX,
"y": touches[0].pageY
}
});
}
else {
$.extend(data, {
held: false,
lastMoveDate: 0,
lastMovePoint: data.startPoint,
moveDate: 0,
movePoint: data.startPoint
});
}
},
updateSwipeData = function (data, touches, timeStamp) {
ensureSingularStartData(data, touches, timeStamp);
var startDate = data.startDate,
startPoint = data.startPoint,
lastMoveDate = data.moveDate || data.startDate,
moveDate = timeStamp,
movePoint = {
"x": touches[0].pageX,
"y": touches[0].pageY
},
hDistance = movePoint.x - startPoint.x, // positive is right
vDistance = movePoint.y - startPoint.y, // positive is down
ms = moveDate - lastMoveDate;
$.extend(data, {
lastMoveDate: lastMoveDate,
lastMovePoint: data.movePoint && data.movePoint.x ? data.movePoint : data.startPoint,
moveDate: moveDate,
movePoint: movePoint,
hDistance: hDistance,
vDistance: vDistance
});
if (!data.swiped && ( Math.abs(hDistance) / ms > data.settings.velocityThresh || Math.abs(vDistance) / ms > data.settings.velocityThresh )) {
data.swiped = true;
}
},
triggerSwipe = function (data, $target) {
var movePoint = data.movePoint,
lastMovePoint = data.lastMovePoint,
distance = movePoint.x === lastMovePoint.x && movePoint.y === lastMovePoint.y ? 0 : Math.sqrt( Math.pow( (movePoint.x - lastMovePoint.x), 2 ) + Math.pow( (movePoint.y - lastMovePoint.y), 2 ) ),
ms = data.moveDate - data.lastMoveDate,
velocity = ms === 0 ? 0 : distance / ms,
hDistance = data.hDistance,
vDistance = data.vDistance,
direction;
if (velocity > data.settings.velocityThresh) {
if (Math.abs(hDistance) > Math.abs(vDistance)) {
direction = hDistance > 0 ? 'right' : 'left';
}
else {
direction = vDistance > 0 ? 'down' : 'up';
}
$target.trigger('touchy-swipe', [$target, {
"direction": direction,
"movePoint": movePoint,
"lastMovePoint": lastMovePoint,
"startPoint": data.startPoint,
"velocity": velocity
}]);
}
},
// other private methods
ensureSingularStartData = function (data, touches, timeStamp) {
if (!data.startPoint) {
data.startPoint = {
"x": touches[0].pageX,
"y": touches[0].pageY
}
}
if (!data.startDate) {
data.startDate = timeStamp;
}
},
hasGestureChange = function () {
return (typeof window.ongesturechange == "object");
},
getTwoTouchPointData = function(e){ // could become multitouch point data for any number of touches?
var points = false,
touches = e.originalEvent.touches;
if(touches.length === 2){
points = {
x1: touches[0].pageX,
y1: touches[0].pageY,
x2: touches[1].pageX,
y2: touches[1].pageY
}
points.centerX = (points.x1 + points.x2) / 2;
points.centerY = (points.y1 + points.y2) / 2;
return points;
}
return points;
},
getTarget = function(e, eventType){
var $delegate,
$target = false,
i = 0,
len = boundElems[eventType].length
if ($.touchyOptions.useDelegation) {
for (; i < len; i += 1) {
$delegate = $(boundElems[eventType][i]).has(e.target);
if ($delegate.length > 0){
$target = $delegate;
break;
}
}
}
else if (boundElems[eventType] && boundElems[eventType].is(e.target)) {
$target = $(e.target)
}
return $target;
},
// get pageX and pageY of an element
// from: http://ecmanaut.blogspot.com/2010/06/elementpagex-and-elementpagey.html
getViewOffset = function (node, singleFrame) {
function addOffset(node, coords, view) {
var p = node.offsetParent;
coords.x += node.offsetLeft - (p ? p.scrollLeft : 0);
coords.y += node.offsetTop - (p ? p.scrollTop : 0);
if (p) {
if (p.nodeType == 1) {
var parentStyle = view.getComputedStyle(p, '');
if (parentStyle.position != 'static') {
coords.x += parseInt(parentStyle.borderLeftWidth);
coords.y += parseInt(parentStyle.borderTopWidth);
if (p.localName == 'TABLE') {
coords.x += parseInt(parentStyle.paddingLeft);
coords.y += parseInt(parentStyle.paddingTop);
}
else if (p.localName == 'BODY') {
var style = view.getComputedStyle(node, '');
coords.x += parseInt(style.marginLeft);
coords.y += parseInt(style.marginTop);
}
}
else if (p.localName == 'BODY') {
coords.x += parseInt(parentStyle.borderLeftWidth);
coords.y += parseInt(parentStyle.borderTopWidth);
}
var parent = node.parentNode;
while (p != parent) {
coords.x -= parent.scrollLeft;
coords.y -= parent.scrollTop;
parent = parent.parentNode;
}
addOffset(p, coords, view);
}
}
else {
if (node.localName == 'BODY') {
var style = view.getComputedStyle(node, '');
coords.x += parseInt(style.borderLeftWidth);
coords.y += parseInt(style.borderTopWidth);
var htmlStyle = view.getComputedStyle(node.parentNode, '');
coords.x -= parseInt(htmlStyle.paddingLeft);
coords.y -= parseInt(htmlStyle.paddingTop);
}
if (node.scrollLeft)
coords.x += node.scrollLeft;
if (node.scrollTop)
coords.y += node.scrollTop;
var win = node.ownerDocument.defaultView;
if (win && (!singleFrame && win.frameElement))
addOffset(win.frameElement, coords, win);
}
}
var coords = {
x: 0,
y: 0
};
if (node)
addOffset(node, coords, node.ownerDocument.defaultView);
return coords;
},
/*
function init (elem, state) {
// Do something to `elem` based on `state`
if (state) {
// from setup
}
else {
// from teardown
}
};
*/
boundElems = {},
contexts = {};
/* The following is a metaprogramming loop, and thus it's ugly.
* See the example in the comments to understand this code more easily.
*/
$.each($.touchyOptions, function(key, value){
if (key !== 'useDelegation') {
var capitalizedKey = key.charAt(0).toUpperCase() + key.slice(1);
boundElems[key] = $([]);
contexts[key] = new (function () {this.context = key;})();
$.event.special["touchy-" + key] = {
setup: function (data, namespaces, eventHandle) {
boundElems[key] = boundElems[key].add( this );
$(this).data('touchy' + capitalizedKey, $.extend({}, $.touchyOptions[key].data));
$(this).data('touchy' + capitalizedKey).settings = $.extend({}, $.touchyOptions[key]);
delete $(this).data('touchy' + capitalizedKey).settings.data;
if ( boundElems[key].length === 1 ) {
$.each($.touchyOptions[key].proxyEvents, function(i, proxyEvent){
$(document).bind(proxyEvent.toLowerCase() + '.touchy.' + key, $.proxy(proxyHandlers['handle' + proxyEvent], contexts[key]));
});
}
},
teardown: function (namespaces) {
boundElems[key] = boundElems[key].not( this );
$(this).removeData('touchy' + capitalizedKey);
if ( boundElems[key].length === 0 ) {
$.each($.touchyOptions[key].proxyEvents, function(i, proxyEvent){
$(document).unbind(proxyEvent.toLowerCase() + '.touchy.' + key);
});
}
},
add: function (handleObj) {
$.extend($(this).data('touchy' + capitalizedKey).settings, handleObj.data);
var old_handler = handleObj.handler;
handleObj.handler = function (event) {
return old_handler.apply(this, arguments);
};
}
};
}
});
/* example code that the above metaprogramming loop would look like, if it
* exploded for the "drag" key.
*
* additional comments are from Ben Alman's awesome blog post
* on jQuery special events:
* http://benalman.com/news/2010/03/jquery-special-events/
*
*//*
$.event.special["touchy-drag"] = {
/* setup()
*
* Do something when the first event handler is bound to a particular
* element.
*
* More explicitly: do something when an event handler is bound to a
* particular element, but only if there are not currently any event
* handlers bound. This may occur in two scenarios: 1) either the very
* first time that event is bound to that element, or 2) the next time
* that event is bound to that element, after all previous handlers
* for that event have been unbound from that element.
*
* data - (Anything) Whatever eventData (optional) was passed in when
* binding the event.
* namespaces - (Array) An array of namespaces specified when binding
* the event.
* eventHandle - (Function) The actual function that will be bound to
* the browser’s native event (this is used internally for
* the beforeunload event, you’ll never use it).
*
* Returning false tells jQuery to bind the specified event handler
* using native DOM methods.
*
* This method, when executed, will always execute immediately before
* the corresponding add method executes.
*
*//*
setup: function (data, namespaces, eventHandle) {
// Event code.
//this is the element to which the event handler is being bound.
// Add this element to the internal collection.
boundElems.drag = boundElems.drag.add( this );
$(this).data('touchyDrag', {
'startPoint': null,
'startDate': null,
'movePoint': null,
'moveDate': null,
'settings': $.touchyOptions.drag,
'held': false
});
// extend and restructure the data object
$(this).data('touchyDrag').settings = $.extend({}, $.touchyOptions.drag);
delete $(this).data('touchyDrag').settings.data;
// If this is the first element to which the event has been bound,
// bind a handler to document to catch all 'click' events.
if ( boundElems.drag.length === 1 ) {
$(document).bind('touchstart.touchy.drag', $.proxy(handleTouchStart, contexts.drag));
$(document).bind('touchmove.touchy.drag', $.proxy(handleTouchMove, contexts.drag));
$(document).bind('touchend.touchy.drag', $.proxy(handleTouchEnd, contexts.drag));
}
//init(this, true);
},
/* teardown()
*
* namespaces - (Array) An array of namespaces specified when unbinding
* the event.
*
* Returning false tells jQuery to unbind the specified event handler
* using native DOM methods.
*
* This method, when executed, will always execute immediately after the
* corresponding remove method executes.
*//*
teardown: function (namespaces) {
// Event code.
// this is the element from which the event handler is being unbound.
// Remove this element from the internal collection.
boundElems.drag = boundElems.drag.not( this );
// Remove plugin data from this element.
$(this).removeData('touchyDrag');
// If this is the last element removed, remove the document 'click'
// event handler that "powers" this special event.
if ( boundElems.drag.length === 0 ) {
$(document).unbind('touchstart.touchy.drag');
$(document).unbind('touchmove.touchy.drag');
$(document).unbind('touchend.touchy.drag');
}
//init(this, false);
},
/* add()
*
* Do something each time an event handler is bound to a particular element.
*
* handleObj - (Object) An object containing these properties (same as the remove method):
* type - (String) The name of the event.
* data - (Anything) Whatever data object (optional) was passed in when binding the event.
* namespace - (String) A sorted, dot-delimited list of namespaces specified when binding the event.
* handler - (Function) The event handler being bound to the event. This function will be called whenever the event is triggered.
* guid - (Number) A unique ID for this event handler. This is used internally for managing handlers.
* selector - (String) The selector used by the delegate or live jQuery methods. Only available when binding event handlers using these two methods.
*
* This method, when executed, will always execute immediately after the corresponding setup method executes.
*//*
add: function (handleObj) {
// Event code.
// this === the element to which the event handler is being bound.
$.extend($(this).data('touchyDrag').settings, handleObj.data);
// Save a reference to the bound event handler.
var old_handler = handleObj.handler;
handleObj.handler = function (event) {
// Modify event object here!
// Call the originally-bound event handler and return its result.
return old_handler.apply(this, arguments);
};
}
// the following might not be needed
/* remove()
*
* Do something each time an event handler is unbound from a particular element.
*
* handleObj - (Object) An object containing these properties (same as the add method):
* type - (String) The name of the event.
* data - (Anything) Whatever data object (optional) was passed in when binding the event.
* namespace - (String) A sorted, dot-delimited list of namespaces specified when binding the event.
* handler - (Function) The event handler being bound to the event. This function will be called whenever the event is triggered.
* guid - (Number) A unique ID for this event handler. This is used internally for managing handlers.
* selector - (String) The selector used by the undelegate or die jQuery methods. Only available when unbinding event handlers using these two methods.
*
* This method, when executed, will always execute immediately before the corresponding teardown method executes.
*//*
,
remove: function (handleObj) {
// code
// this === the element from which the event handler is being unbound.
}
// Theoretically, I could replace the context-based method of passing the
// the special event name to the internal, delegated event handlers by
// creating another function here that would in turn call the event handlers
// with a parameter appended... maybe revisit this idea. Might be simpler
// and easier to understand.
};
*/
})(jQuery);