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/**
* jquery.hoverdir.js v1.1.0
* http://www.codrops.com
*
* Licensed under the MIT license.
* http://www.opensource.org/licenses/mit-license.php
*
* Copyright 2012, Codrops
* http://www.codrops.com
*/
;( function( $, window, undefined ) {
'use strict';
$.HoverDir = function( options, element ) {
this.$el = $( element );
this._init( options );
};
// the options
$.HoverDir.defaults = {
speed : 300,
easing : 'ease',
hoverDelay : 0,
inverse : false
};
$.HoverDir.prototype = {
_init : function( options ) {
// options
this.options = $.extend( true, {}, $.HoverDir.defaults, options );
// transition properties
this.transitionProp = 'all ' + this.options.speed + 'ms ' + this.options.easing;
// support for CSS transitions
this.support = Modernizr.csstransitions;
// load the events
this._loadEvents();
},
_loadEvents : function() {
var self = this;
this.$el.on( 'mouseenter.hoverdir, mouseleave.hoverdir', function( event ) {
var $el = $( this ),
$hoverElem = $el.find( '.overlay' ),
direction = self._getDir( $el, { x : event.pageX, y : event.pageY } ),
styleCSS = self._getStyle( direction );
if( event.type === 'mouseenter' ) {
$hoverElem.hide().css( styleCSS.from );
clearTimeout( self.tmhover );
self.tmhover = setTimeout( function() {
$hoverElem.show( 0, function() {
var $el = $( this );
if( self.support ) {
$el.css( 'transition', self.transitionProp );
}
self._applyAnimation( $el, styleCSS.to, self.options.speed );
} );
}, self.options.hoverDelay );
}
else {
if( self.support ) {
$hoverElem.css( 'transition', self.transitionProp );
}
clearTimeout( self.tmhover );
self._applyAnimation( $hoverElem, styleCSS.from, self.options.speed );
}
} );
},
// credits : http://stackoverflow.com/a/3647634
_getDir : function( $el, coordinates ) {
// the width and height of the current div
var w = $el.width(),
h = $el.height(),
// calculate the x and y to get an angle to the center of the div from that x and y.
// gets the x value relative to the center of the DIV and "normalize" it
x = ( coordinates.x - $el.offset().left - ( w/2 )) * ( w > h ? ( h/w ) : 1 ),
y = ( coordinates.y - $el.offset().top - ( h/2 )) * ( h > w ? ( w/h ) : 1 ),
// the angle and the direction from where the mouse came in/went out clockwise (TRBL=0123);
// first calculate the angle of the point,
// add 180 deg to get rid of the negative values
// divide by 90 to get the quadrant
// add 3 and do a modulo by 4 to shift the quadrants to a proper clockwise TRBL (top/right/bottom/left) **/
direction = Math.round( ( ( ( Math.atan2(y, x) * (180 / Math.PI) ) + 180 ) / 90 ) + 3 ) % 4;
return direction;
},
_getStyle : function( direction ) {
var fromStyle, toStyle,
slideFromTop = { left : '0px', top : '-100%' },
slideFromBottom = { left : '0px', top : '100%' },
slideFromLeft = { left : '-100%', top : '0px' },
slideFromRight = { left : '100%', top : '0px' },
slideTop = { top : '0px' },
slideLeft = { left : '0px' };
switch( direction ) {
case 0:
// from top
fromStyle = !this.options.inverse ? slideFromTop : slideFromBottom;
toStyle = slideTop;
break;
case 1:
// from right
fromStyle = !this.options.inverse ? slideFromRight : slideFromLeft;
toStyle = slideLeft;
break;
case 2:
// from bottom
fromStyle = !this.options.inverse ? slideFromBottom : slideFromTop;
toStyle = slideTop;
break;
case 3:
// from left
fromStyle = !this.options.inverse ? slideFromLeft : slideFromRight;
toStyle = slideLeft;
break;
};
return { from : fromStyle, to : toStyle };
},
// apply a transition or fallback to jquery animate based on Modernizr.csstransitions support
_applyAnimation : function( el, styleCSS, speed ) {
$.fn.applyStyle = this.support ? $.fn.css : $.fn.animate;
el.stop().applyStyle( styleCSS, $.extend( true, [], { duration : speed + 'ms' } ) );
},
};
var logError = function( message ) {
if ( window.console ) {
window.console.error( message );
}
};
$.fn.hoverdir = function( options ) {
var instance = $.data( this, 'hoverdir' );
if ( typeof options === 'string' ) {
var args = Array.prototype.slice.call( arguments, 1 );
this.each(function() {
if ( !instance ) {
logError( "cannot call methods on hoverdir prior to initialization; " +
"attempted to call method '" + options + "'" );
return;
}
if ( !$.isFunction( instance[options] ) || options.charAt(0) === "_" ) {
logError( "no such method '" + options + "' for hoverdir instance" );
return;
}
instance[ options ].apply( instance, args );
});
}
else {
this.each(function() {
if ( instance ) {
instance._init();
}
else {
instance = $.data( this, 'hoverdir', new $.HoverDir( options, this ) );
}
});
}
return instance;
};
} )( jQuery, window );