-澳门凯发
(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);