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@brendon
Created August 26, 2012 23:18
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jsTree Touch Compatibility
/**
* jQuery.UI.iPad plugin
* Copyright (c) 2010 Stephen von Takach
* licensed under MIT.
* Date: 27/8/2010
*
* Project Home:
* http://code.google.com/p/jquery-ui-for-ipad-and-iphone/
*
* Modified: 19/01/2012
* Organized as a proper plugin and added addTouch()
*/
var tapValid = false;
(function ($) {
var lastTap = null, // Holds last tapped element (so we can compare for double tap)
tapValid = false, // Are we still in the .6 second window where a double tap can occur
tapTimeout = null, // The timeout reference
rightClickPending = false, // Is a right click still feasible
rightClickEvent = null, // the original event
holdTimeout = null, // timeout reference
cancelMouseUp = false, // prevents a click from occurring as we want the context menu
currentDOMElement = null; // the last DOM element that was seen during a drag.
function cancelTap() {
tapValid = false;
}
function cancelHold() {
if (rightClickPending) {
window.clearTimeout(holdTimeout);
rightClickPending = false;
rightClickEvent = null;
}
}
function startHold(event) {
if (rightClickPending) {
return;
}
rightClickPending = true; // We could be performing a right click
rightClickEvent = (event.changedTouches)[0];
holdTimeout = window.setTimeout(doRightClick, 800);
}
function doRightClick() {
rightClickPending = false;
// We need to mouse up (as we were down)
var first = rightClickEvent,
simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMouseEvent("mouseup", true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY, false, false, false, false, 0, null);
first.target.dispatchEvent(simulatedEvent);
// Emulate a right click
simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMouseEvent("mousedown", true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY, false, false, false, false, 2, null);
first.target.dispatchEvent(simulatedEvent);
// Show a context menu
simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMouseEvent("contextmenu", true, true, window, 1, first.screenX + 50, first.screenY + 5, first.clientX + 50, first.clientY + 5, false, false, false, false, 2, null);
first.target.dispatchEvent(simulatedEvent);
simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMouseEvent("mouseup", true, true, window, 1, first.screenX + 50, first.screenY + 5, first.clientX + 50, first.clientY + 5, false, false, false, false, 2, null);
first.target.dispatchEvent(simulatedEvent);
cancelMouseUp = true;
rightClickEvent = null; // Release memory
}
// mouse over event then mouse down
function iPadTouchStart(event) {
var touches = event.changedTouches,
first = touches[0],
type = "mouseover",
simulatedEvent = document.createEvent("MouseEvent");
// Mouse over first - I have live events attached on mouse over
simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY, false, false, false, false, 0, null);
first.target.dispatchEvent(simulatedEvent);
type = "mousedown";
simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY, false, false, false, false, 0, null);
first.target.dispatchEvent(simulatedEvent);
if (!tapValid) {
lastTap = first.target;
tapValid = true;
tapTimeout = window.setTimeout(cancelTap, 600);
startHold(event);
} else {
window.clearTimeout(tapTimeout);
// If a double tap is still a possibility and the elements are the same then perform a double click
if (first.target == lastTap) {
lastTap = null;
tapValid = false;
type = "click";
simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY, false, false, false, false, 0, null);
first.target.dispatchEvent(simulatedEvent);
type = "dblclick";
simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY, false, false, false, false, 0, null);
first.target.dispatchEvent(simulatedEvent);
} else {
lastTap = first.target;
tapValid = true;
tapTimeout = window.setTimeout(cancelTap, 600);
startHold(event);
}
}
}
function getDOMElementFromEvent(event) {
if (event.targetTouches && event.targetTouches[0]) {
return document.elementFromPoint(event.targetTouches[0].pageX - window.pageXOffset, event.targetTouches[0].pageY - window.pageYOffset);
}
return null;
}
function iPadTouchHandler(event) {
var type = "",
button = 0; /*left*/
if (event.touches.length > 1) {
return;
}
switch (event.type) {
case "touchstart":
if ($(event.changedTouches[0].target).is("select")) {
return;
}
iPadTouchStart(event); /*We need to trigger two events here to support one touch drag and drop*/
event.preventDefault();
currentDOMElement = getDOMElementFromEvent(event);
return false;
break;
case "touchmove":
cancelHold();
type = "mousemove";
event.preventDefault();
currentDOMElement = getDOMElementFromEvent(event);
break;
case "touchend":
if (cancelMouseUp) {
cancelMouseUp = false;
event.preventDefault();
return false;
}
cancelHold();
type = "mouseup";
break;
default:
return;
}
var touches = event.changedTouches,
first = touches[0],
simulatedEvent = document.createEvent("MouseEvent");
simulatedEvent.initMouseEvent(type, true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
false, false, false, false, button, null);
currentDOMElement.dispatchEvent(simulatedEvent);
if (type == "mouseup" && tapValid && first.target == lastTap) { // This actually emulates the ipad's default behavior (which we prevented)
simulatedEvent = document.createEvent("MouseEvent"); // This check avoids click being emulated on a double tap
simulatedEvent.initMouseEvent("click", true, true, window, 1, first.screenX, first.screenY, first.clientX, first.clientY,
false, false, false, false, button, null);
currentDOMElement.dispatchEvent(simulatedEvent);
}
}
$.extend($.support, {
touch: "ontouchend" in document
});
$.fn.addTouch = function () {
if ($.support.touch) {
this.each(function (i, el) {
el.addEventListener("touchstart", iPadTouchHandler, false);
el.addEventListener("touchmove", iPadTouchHandler, false);
el.addEventListener("touchend", iPadTouchHandler, false);
el.addEventListener("touchcancel", iPadTouchHandler, false);
});
}
}
})(jQuery);
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