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/*! 
jquery.event.drag.js ~ v1.5 ~ Copyright (c) 2008, Three Dub Media (http://threedubmedia.com)  
Liscensed under the MIT License ~ http://threedubmedia.googlecode.com/files/MIT-LICENSE.txt
*/
;(function($){ // secure $ jQuery alias
/*******************************************************************************************/
// Created: 2008-06-04 | Updated: 2009-03-24
/*******************************************************************************************/
// Events: drag, dragstart, dragend
/*******************************************************************************************/

// jquery method
$.fn.drag = function( fn1, fn2, fn3 ){
	if ( fn2 ) this.bind('dragstart', fn1 ); // 2+ args
	if ( fn3 ) this.bind('dragend', fn3 ); // 3 args
	return !fn1 ? this.trigger('drag') // 0 args
		: this.bind('drag', fn2 ? fn2 : fn1 ); // 1+ args
	};

// local refs
var $event = $.event, $special = $event.special,

// special event configuration
drag = $special.drag = {
	not: ':input', // don't begin to drag on event.targets that match this selector
	distance: 0, // distance dragged before dragstart
	which: 1, // mouse button pressed to start drag sequence
	dragging: false, // hold the active target element
	setup: function( data ){
		data = $.extend({ 
			distance: drag.distance, 
			which: drag.which, 
			not: drag.not
			}, data || {});
		data.distance = squared( data.distance ); //  x² + y² = distance²
		$event.add( this, "mousedown", handler, data );
		if ( this.attachEvent ) this.attachEvent("ondragstart", dontStart ); // prevent image dragging in IE...
		},
	teardown: function(){
		$event.remove( this, "mousedown", handler );
		if ( this === drag.dragging ) drag.dragging = drag.proxy = false; // deactivate element
		selectable( this, true ); // enable text selection
		if ( this.detachEvent ) this.detachEvent("ondragstart", dontStart ); // prevent image dragging in IE...
		}
	};
	
// prevent normal event binding...
$special.dragstart = $special.dragend = { setup:function(){}, teardown:function(){} };

// handle drag-releatd DOM events
function handler ( event ){ 
	var elem = this, returned, data = event.data || {};
	// mousemove or mouseup
	if ( data.elem ){ 
		// update event properties...
		elem = event.dragTarget = data.elem; // drag source element
		event.dragProxy = drag.proxy || elem; // proxy element or source
		event.cursorOffsetX = data.pageX - data.left; // mousedown offset
		event.cursorOffsetY = data.pageY - data.top; // mousedown offset
		event.offsetX = event.pageX - event.cursorOffsetX; // element offset
		event.offsetY = event.pageY - event.cursorOffsetY; // element offset
		}
	// mousedown, check some initial props to avoid the switch statement
	else if ( drag.dragging || ( data.which>0 && event.which!=data.which ) || 
		$( event.target ).is( data.not ) ) return;
	// handle various events
	switch ( event.type ){
		// mousedown, left click, event.target is not restricted, init dragging
		case 'mousedown':
			$.extend( data, $( elem ).offset(), { 
				elem: elem, target: event.target,
				pageX: event.pageX, pageY: event.pageY
				}); // store some initial attributes
			$event.add( document, "mousemove mouseup", handler, data );
			selectable( elem, false ); // disable text selection
			drag.dragging = null; // pending state
			return false; // prevents text selection in safari 
		// mousemove, check distance, start dragging
		case !drag.dragging && 'mousemove': 
			if ( squared( event.pageX-data.pageX ) 
				+ squared( event.pageY-data.pageY ) //  x² + y² = distance²
				< data.distance ) break; // distance tolerance not reached
			event.target = data.target; // force target from "mousedown" event (fix distance issue)
			returned = hijack( event, "dragstart", elem ); // trigger "dragstart", return proxy element
			if ( returned !== false ){ // "dragstart" not rejected
				drag.dragging = elem; // activate element
				drag.proxy = event.dragProxy = $( returned || elem )[0]; // set proxy
				}
		// mousemove, dragging
		case 'mousemove': 
			if ( drag.dragging ){
				returned = hijack( event, "drag", elem ); // trigger "drag"		
				if ( $special.drop ){ // manage drop events
					$special.drop.allowed = ( returned !== false ); // prevent drop
					$special.drop.handler( event ); // "dropstart", "dropend"
					}
				if ( returned !== false ) break; // "drag" not rejected, stop		
				event.type = "mouseup"; // helps "drop" handler behave
				}
		// mouseup, stop dragging
		case 'mouseup': 
			$event.remove( document, "mousemove mouseup", handler ); // remove page events
			if ( drag.dragging ){
				if ( $special.drop ) $special.drop.handler( event ); // "drop"
				hijack( event, "dragend", elem ); // trigger "dragend"	
				}
			selectable( elem, true ); // enable text selection
			drag.dragging = drag.proxy = data.elem = false; // deactivate element
			break;
		} 
	return true;
	};

// set event type to custom value, and handle it
function hijack ( event, type, elem ){
	event.type = type; // force the event type
	var result = $.event.handle.call( elem, event );
	return result===false ? false : result || event.result;
	};
	
// return the value squared	
function squared ( value ){ return Math.pow( value, 2 ); };

// suppress default dragstart IE events...
function dontStart(){ return ( drag.dragging === false ); };	

// toggles text selection attributes	
function selectable ( elem, bool ){ 
	if ( !elem ) return; // maybe element was removed ? 
	elem.unselectable = bool ? "off" : "on"; // IE
	elem.onselectstart = function(){ return bool; }; // IE
	//if ( document.selection && document.selection.empty ) document.selection.empty(); // IE
	if ( elem.style ) elem.style.MozUserSelect = bool ? "" : "none"; // FF
	};	
	
/*******************************************************************************************/
})( jQuery ); // confine scope