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/*!
* jquery.event.drop - v 2.2
* Copyright (c) 2010 Three Dub Media - http://threedubmedia.com
* Open Source MIT License - http://threedubmedia.com/code/license
*/
// Created: 2008-06-04
// Updated: 2012-05-21
// REQUIRES: jquery 1.7.x, event.drag 2.2
;(function($){ // secure $ jQuery alias
// Events: drop, dropstart, dropend
// add the jquery instance method
$.fn.drop = function( str, arg, opts ){
// figure out the event type
var type = typeof str == "string" ? str : "",
// figure out the event handler...
fn = $.isFunction( str ) ? str : $.isFunction( arg ) ? arg : null;
// fix the event type
if ( type.indexOf("drop") !== 0 )
type = "drop"+ type;
// were options passed
opts = ( str == fn ? arg : opts ) || {};
// trigger or bind event handler
return fn ? this.bind( type, opts, fn ) : this.trigger( type );
};
// DROP MANAGEMENT UTILITY
// returns filtered drop target elements, caches their positions
$.drop = function( opts ){
opts = opts || {};
// safely set new options...
drop.multi = opts.multi === true ? Infinity :
opts.multi === false ? 1 : !isNaN( opts.multi ) ? opts.multi : drop.multi;
drop.delay = opts.delay || drop.delay;
drop.tolerance = $.isFunction( opts.tolerance ) ? opts.tolerance :
opts.tolerance === null ? null : drop.tolerance;
drop.mode = opts.mode || drop.mode || 'intersect';
};
// local refs (increase compression)
var $event = $.event,
$special = $event.special,
// configure the drop special event
drop = $.event.special.drop = {
// these are the default settings
multi: 1, // allow multiple drop winners per dragged element
delay: 20, // async timeout delay
mode: 'overlap', // drop tolerance mode
// internal cache
targets: [],
// the key name for stored drop data
datakey: "dropdata",
// prevent bubbling for better performance
noBubble: true,
// count bound related events
add: function( obj ){
// read the interaction data
var data = $.data( this, drop.datakey );
// count another realted event
data.related += 1;
},
// forget unbound related events
remove: function(){
$.data( this, drop.datakey ).related -= 1;
},
// configure the interactions
setup: function(){
// check for related events
if ( $.data( this, drop.datakey ) )
return;
// initialize the drop element data
var data = {
related: 0,
active: [],
anyactive: 0,
winner: 0,
location: {}
};
// store the drop data on the element
$.data( this, drop.datakey, data );
// store the drop target in internal cache
drop.targets.push( this );
},
// destroy the configure interaction
teardown: function(){
var data = $.data( this, drop.datakey ) || {};
// check for related events
if ( data.related )
return;
// remove the stored data
$.removeData( this, drop.datakey );
// reference the targeted element
var element = this;
// remove from the internal cache
drop.targets = $.grep( drop.targets, function( target ){
return ( target !== element );
});
},
// shared event handler
handler: function( event, dd ){
// local vars
var results, $targets;
// make sure the right data is available
if ( !dd )
return;
// handle various events
switch ( event.type ){
// draginit, from $.event.special.drag
case 'mousedown': // DROPINIT >>
case 'touchstart': // DROPINIT >>
// collect and assign the drop targets
$targets = $( drop.targets );
if ( typeof dd.drop == "string" )
$targets = $targets.filter( dd.drop );
// reset drop data winner properties
$targets.each(function(){
var data = $.data( this, drop.datakey );
data.active = [];
data.anyactive = 0;
data.winner = 0;
});
// set available target elements
dd.droppable = $targets;
// activate drop targets for the initial element being dragged
$special.drag.hijack( event, "dropinit", dd );
break;
// drag, from $.event.special.drag
case 'mousemove': // TOLERATE >>
case 'touchmove': // TOLERATE >>
drop.event = event; // store the mousemove event
if ( !drop.timer )
// monitor drop targets
drop.tolerate( dd );
break;
// dragend, from $.event.special.drag
case 'mouseup': // DROP >> DROPEND >>
case 'touchend': // DROP >> DROPEND >>
drop.timer = clearTimeout( drop.timer ); // delete timer
if ( dd.propagates ){
$special.drag.hijack( event, "drop", dd );
$special.drag.hijack( event, "dropend", dd );
}
break;
}
},
// returns the location positions of an element
locate: function( elem, index ){
var data = $.data( elem, drop.datakey ),
$elem = $( elem ),
posi = $elem.offset() || {},
height = $elem.outerHeight(),
width = $elem.outerWidth(),
location = {
elem: elem,
width: width,
height: height,
top: posi.top,
left: posi.left,
right: posi.left + width,
bottom: posi.top + height
};
// drag elements might not have dropdata
if ( data ){
data.location = location;
data.index = index;
data.elem = elem;
}
return location;
},
// test the location positions of an element against another OR an X,Y coord
contains: function( target, test ){ // target { location } contains test [x,y] or { location }
return ( ( test[0] || test.left ) >= target.left && ( test[0] || test.right ) <= target.right
&& ( test[1] || test.top ) >= target.top && ( test[1] || test.bottom ) <= target.bottom );
},
// stored tolerance modes
modes: { // fn scope: "$.event.special.drop" object
// target with mouse wins, else target with most overlap wins
'intersect': function( event, proxy, target ){
return this.contains( target, [ event.pageX, event.pageY ] ) ? // check cursor
1e9 : this.modes.overlap.apply( this, arguments ); // check overlap
},
// target with most overlap wins
'overlap': function( event, proxy, target ){
// calculate the area of overlap...
return Math.max( 0, Math.min( target.bottom, proxy.bottom ) - Math.max( target.top, proxy.top ) )
* Math.max( 0, Math.min( target.right, proxy.right ) - Math.max( target.left, proxy.left ) );
},
// proxy is completely contained within target bounds
'fit': function( event, proxy, target ){
return this.contains( target, proxy ) ? 1 : 0;
},
// center of the proxy is contained within target bounds
'middle': function( event, proxy, target ){
return this.contains( target, [ proxy.left + proxy.width * .5, proxy.top + proxy.height * .5 ] ) ? 1 : 0;
}
},
// sort drop target cache by by winner (dsc), then index (asc)
sort: function( a, b ){
return ( b.winner - a.winner ) || ( a.index - b.index );
},
// async, recursive tolerance execution
tolerate: function( dd ){
// declare local refs
var i, drp, drg, data, arr, len, elem,
// interaction iteration variables
x = 0, ia, end = dd.interactions.length,
// determine the mouse coords
xy = [ drop.event.pageX, drop.event.pageY ],
// custom or stored tolerance fn
tolerance = drop.tolerance || drop.modes[ drop.mode ];
// go through each passed interaction...
do if ( ia = dd.interactions[x] ){
// check valid interaction
if ( !ia )
return;
// initialize or clear the drop data
ia.drop = [];
// holds the drop elements
arr = [];
len = ia.droppable.length;
// determine the proxy location, if needed
if ( tolerance )
drg = drop.locate( ia.proxy );
// reset the loop
i = 0;
// loop each stored drop target
do if ( elem = ia.droppable[i] ){
data = $.data( elem, drop.datakey );
drp = data.location;
if ( !drp ) continue;
// find a winner: tolerance function is defined, call it
data.winner = tolerance ? tolerance.call( drop, drop.event, drg, drp )
// mouse position is always the fallback
: drop.contains( drp, xy ) ? 1 : 0;
arr.push( data );
} while ( ++i < len ); // loop
// sort the drop targets
arr.sort( drop.sort );
// reset the loop
i = 0;
// loop through all of the targets again
do if ( data = arr[ i ] ){
// winners...
if ( data.winner && ia.drop.length < drop.multi ){
// new winner... dropstart
if ( !data.active[x] && !data.anyactive ){
// check to make sure that this is not prevented
if ( $special.drag.hijack( drop.event, "dropstart", dd, x, data.elem )[0] !== false ){
data.active[x] = 1;
data.anyactive += 1;
}
// if false, it is not a winner
else
data.winner = 0;
}
// if it is still a winner
if ( data.winner )
ia.drop.push( data.elem );
}
// losers...
else if ( data.active[x] && data.anyactive == 1 ){
// former winner... dropend
$special.drag.hijack( drop.event, "dropend", dd, x, data.elem );
data.active[x] = 0;
data.anyactive -= 1;
}
} while ( ++i < len ); // loop
} while ( ++x < end ) // loop
// check if the mouse is still moving or is idle
if ( drop.last && xy[0] == drop.last.pageX && xy[1] == drop.last.pageY )
delete drop.timer; // idle, don't recurse
else // recurse
drop.timer = setTimeout(function(){
drop.tolerate( dd );
}, drop.delay );
// remember event, to compare idleness
drop.last = drop.event;
}
};
// share the same special event configuration with related events...
$special.dropinit = $special.dropstart = $special.dropend = drop;
})(jQuery); // confine scope
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