xcat-core/xCAT-UI/js/jquery/hoverIntent.js
phamt cebb002cde Changed code structure
git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@6763 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
2010-07-14 18:06:01 +00:00

117 lines
3.3 KiB
JavaScript

(function($) {
/* hoverIntent by Brian Cherne */
$.fn.hoverIntent = function(f, g) {
// default configuration options
var cfg = {
sensitivity : 7,
interval : 100,
timeout : 0
};
// override configuration options with user supplied object
cfg = $.extend(cfg, g ? {
over : f,
out : g
} : f);
// instantiate variables
// cX, cY = current X and Y position of mouse, updated by mousemove
// event
// pX, pY = previous X and Y position of mouse, set by mouseover and
// polling interval
var cX, cY, pX, pY;
// A private function for getting mouse position
var track = function(ev) {
cX = ev.pageX;
cY = ev.pageY;
};
// A private function for comparing current and previous mouse position
var compare = function(ev, ob) {
ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
// compare mouse positions to see if they've crossed the threshold
if ((Math.abs(pX - cX) + Math.abs(pY - cY)) < cfg.sensitivity) {
$(ob).unbind("mousemove", track);
// set hoverIntent state to true (so mouseOut can be called)
ob.hoverIntent_s = 1;
return cfg.over.apply(ob, [ ev ]);
} else {
// set previous coordinates for next time
pX = cX;
pY = cY;
// use self-calling timeout, guarantees intervals are spaced out
// properly (avoids JavaScript timer bugs)
ob.hoverIntent_t = setTimeout(function() {
compare(ev, ob);
}, cfg.interval);
}
};
// A private function for delaying the mouseOut function
var delay = function(ev, ob) {
ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
ob.hoverIntent_s = 0;
return cfg.out.apply(ob, [ ev ]);
};
// A private function for handling mouse 'hovering'
var handleHover = function(e) {
// next three lines copied from jQuery.hover, ignore children
// onMouseOver/onMouseOut
var p = (e.type == "mouseover" ? e.fromElement : e.toElement)
|| e.relatedTarget;
while (p && p != this) {
try {
p = p.parentNode;
} catch (e) {
p = this;
}
}
if (p == this) {
return false;
}
// copy objects to be passed into t (required for event object to be
// passed in IE)
var ev = jQuery.extend( {}, e);
var ob = this;
// cancel hoverIntent timer if it exists
if (ob.hoverIntent_t) {
ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
}
// else e.type == "onmouseover"
if (e.type == "mouseover") {
// set "previous" X and Y position based on initial entry point
pX = ev.pageX;
pY = ev.pageY;
// update "current" X and Y position based on mousemove
$(ob).bind("mousemove", track);
// start polling interval (self-calling timeout) to compare
// mouse coordinates over time
if (ob.hoverIntent_s != 1) {
ob.hoverIntent_t = setTimeout(function() {
compare(ev, ob);
}, cfg.interval);
}
// else e.type == "onmouseout"
} else {
// unbind expensive mousemove event
$(ob).unbind("mousemove", track);
// if hoverIntent state is true, then call the mouseOut function
// after the specified delay
if (ob.hoverIntent_s == 1) {
ob.hoverIntent_t = setTimeout(function() {
delay(ev, ob);
}, cfg.timeout);
}
}
};
// bind the function to the two event listeners
return this.mouseover(handleHover).mouseout(handleHover);
};
})(jQuery);