/**

 * Interface Elements for jQuery

 * Selectables

 *

 * http://interface.eyecon.ro

 *

 * Copyright (c) 2006 Stefan Petre

 * Dual licensed under the MIT (MIT-LICENSE.txt)

 * and GPL (GPL-LICENSE.txt) licenses.

 *

 *

 */

jQuery.selectHelper = null;

jQuery.selectKeyHelper = false;

jQuery.selectdrug = null;

jQuery.selectCurrent = [];	// For current selection

jQuery.selectKeyDown = function(e) {

	var pressedKey = e.charCode || e.keyCode || -1;

	if (pressedKey == 17 || pressedKey == 16) {

		jQuery.selectKeyHelper = true;

	}

};

jQuery.selectKeyUp = function(e) {

	jQuery.selectKeyHelper = false;

};

jQuery.selectstart = function(e) {

	this.f.pointer = jQuery.iUtil.getPointer(e);

	this.f.pos = jQuery.extend(

		jQuery.iUtil.getPosition(this), 

		jQuery.iUtil.getSize(this)

	);

	this.f.scr = jQuery.iUtil.getScroll(this);

	this.f.pointer.x -= this.f.pos.x;

	this.f.pointer.y -= this.f.pos.y;

	jQuery(this).append(jQuery.selectHelper.get(0));

	if (this.f.hc)

		jQuery.selectHelper.addClass(this.f.hc).css('display','block');

	jQuery.selectHelper.css(

		{

			display: 'block',

			width: '0px',

			height: '0px'

		}

	);

	if (this.f.o) {

		jQuery.selectHelper.css('opacity', this.f.o);

	}

	jQuery.selectdrug = this;

	jQuery.selectedone = false;

	jQuery.selectCurrent = [];	// For current selection state

	this.f.el.each(

		function ()

		{

			this.pos = {

				x: this.offsetLeft + (this.currentStyle && !jQuery.browser.opera ?parseInt(this.currentStyle.borderLeftWidth)||0:0) + (jQuery.selectdrug.scrollLeft||0), 

				y: this.offsetTop + (this.currentStyle && !jQuery.browser.opera ?parseInt(this.currentStyle.borderTopWidth)||0:0) + (jQuery.selectdrug.scrollTop||0),

				wb: this.offsetWidth,

				hb: this.offsetHeight

			};

			if (this.s == true) {

				if (jQuery.selectKeyHelper == false) {

					this.s = false;

					jQuery(this).removeClass(jQuery.selectdrug.f.sc);

				} else {

					jQuery.selectedone = true;

					// Save current state

					jQuery.selectCurrent[jQuery.selectCurrent.length] = jQuery.attr(this,'id');

				}

			}

		}

	);

	jQuery.selectcheck.apply(this, [e]);

	jQuery(document)

		.bind('mousemove', jQuery.selectcheck)

		.bind('mouseup', jQuery.selectstop);

	return false;

};

jQuery.selectcheck = function(e)

{

	if(!jQuery.selectdrug)

		return;

	jQuery.selectcheckApply.apply(jQuery.selectdrug, [e]);

};

jQuery.selectcheckApply = function(e)

{

	if(!jQuery.selectdrug)

		return;

	var pointer = jQuery.iUtil.getPointer(e);

	var scr = jQuery.iUtil.getScroll(jQuery.selectdrug);

	pointer.x += scr.l - this.f.scr.l - this.f.pos.x;

	pointer.y += scr.t - this.f.scr.t - this.f.pos.y;

	var sx = Math.min(pointer.x, this.f.pointer.x);

	var sw = Math.min(Math.abs(pointer.x - this.f.pointer.x), Math.abs(this.f.scr.w - sx));

	var sy = Math.min(pointer.y, this.f.pointer.y);

	var sh = Math.min(Math.abs(pointer.y - this.f.pointer.y), Math.abs(this.f.scr.h - sy));

	if (this.scrollTop > 0 && pointer.y - 20 < this.scrollTop) {

		var diff = Math.min(scr.t, 10);

		sy -= diff;

		sh += diff;

		this.scrollTop -= diff;

	} else if (this.scrollTop+ this.f.pos.h < this.f.scr.h && pointer.y + 20 > this.scrollTop + this.f.pos.h) {

		var diff = Math.min(this.f.scr.h - this.scrollTop, 10);

		this.scrollTop += diff;

		if (this.scrollTop != scr.t)

			sh += diff;

	}

	if (this.scrollLeft > 0 && pointer.x - 20 < this.scrollLeft) {

		var diff = Math.min(scr.l, 10);

		sx -= diff;

		sw += diff;

		this.scrollLeft -= diff;

	} else if (this.scrollLeft+ this.f.pos.w < this.f.scr.w && pointer.x + 20 > this.scrollLeft + this.f.pos.w) {

		var diff = Math.min(this.f.scr.w - this.scrollLeft, 10);

		this.scrollLeft += diff;

		if (this.scrollLeft != scr.l)

			sw += diff;

	}

	jQuery.selectHelper.css(

		{

			left:	sx + 'px',

			top:	sy + 'px',

			width:	sw + 'px',

			height:	sh + 'px'

		}

	);

	jQuery.selectHelper.l = sx + this.f.scr.l;

	jQuery.selectHelper.t = sy + this.f.scr.t;

	jQuery.selectHelper.r = jQuery.selectHelper.l + sw;

	jQuery.selectHelper.b = jQuery.selectHelper.t + sh;

	jQuery.selectedone = false;

	this.f.el.each(

		function () {

			// Locate the current element in the current selection

			iIndex = jQuery.selectCurrent.indexOf(jQuery.attr(this, 'id'));

			// In case we are currently OVER an item

			if (

				! ( this.pos.x > jQuery.selectHelper.r

				|| (this.pos.x + this.pos.wb) < jQuery.selectHelper.l

				|| this.pos.y > jQuery.selectHelper.b

				|| (this.pos.y + this.pos.hb) < jQuery.selectHelper.t

				)

			)

			{

				jQuery.selectedone = true;

				if (this.s != true) {

					this.s = true;

					jQuery(this).addClass(jQuery.selectdrug.f.sc);

				}

				// Check to see if this item was previously selected, if so, unselect it

				if (iIndex != -1) {

					this.s = false;

					jQuery(this).removeClass(jQuery.selectdrug.f.sc);

				}

			} else if (

						(this.s == true) &&

						(iIndex == -1)

					) {

				// If the item was marked as selected, but it was not selected when you started dragging unselect it.

				this.s = false;

				jQuery(this).removeClass(jQuery.selectdrug.f.sc);

			} else if (

						(!this.s) &&

						(jQuery.selectKeyHelper == true) &&

						(iIndex != -1)

					) {

				// Reselect the item if:

				// - we ARE multiselecting,

				// - dragged over an allready selected object (so it got unselected)

				// - But then dragged the selection out of it again.

				this.s = true;

				jQuery(this).addClass(jQuery.selectdrug.f.sc);

			}

		}

	);

	return false;

};

jQuery.selectstop = function(e)

{

	if(!jQuery.selectdrug)

		return;

	jQuery.selectstopApply.apply(jQuery.selectdrug, [e]);

};

jQuery.selectstopApply = function(e)

{

	jQuery(document)

		.unbind('mousemove', jQuery.selectcheck)

		.unbind('mouseup', jQuery.selectstop);

	if(!jQuery.selectdrug)

		return;

	jQuery.selectHelper.css('display','none');

	if (this.f.hc)

		jQuery.selectHelper.removeClass(this.f.hc);

	jQuery.selectdrug = false;

	jQuery('body').append(jQuery.selectHelper.get(0));

	//

	// In case we have selected some new items..

	if (jQuery.selectedone == true) {

		if (this.f.onselect)

			this.f.onselect(jQuery.Selectserialize(jQuery.attr(this,'id')));

	} else {

		if (this.f.onselectstop)

			this.f.onselectstop(jQuery.Selectserialize(jQuery.attr(this,'id')));

	}

	// Reset current selection

	jQuery.selectCurrent = [];

};

jQuery.Selectserialize = function(s)

{

	var h = '';

	var o = [];

	if (a = jQuery('#' + s)) {

		a.get(0).f.el.each(

			function ()

			{

				if (this.s == true) {

					if (h.length > 0) {

						h += '&';

					}

					h += s + '[]=' + jQuery.attr(this,'id');

					o[o.length] = jQuery.attr(this,'id');

				}

			}

		);

	}

	return {hash:h, o:o};

};

jQuery.fn.Selectable = function(o)

{

	if (!jQuery.selectHelper) {

		jQuery('body',document).append('<div id="selectHelper"></div>').bind('keydown', jQuery.selectKeyDown).bind('keyup', jQuery.selectKeyUp);

		jQuery.selectHelper = jQuery('#selectHelper');

		jQuery.selectHelper.css(

			{

				position:	'absolute',

				display:	'none'

			}

		);

		if (window.event) {

			jQuery('body',document).bind('keydown', jQuery.selectKeyDown).bind('keyup', jQuery.selectKeyUp);

		} else {

			jQuery(document).bind('keydown', jQuery.selectKeyDown).bind('keyup', jQuery.selectKeyUp);

		}

	}

    if (!o) {

		o = {};

	}

    return this.each(

		function()

		{

			if (this.isSelectable)

				return;

			this.isSelectable = true;

			this.f = {

				a : o.accept,

				o : o.opacity ? parseFloat(o.opacity) : false,

				sc : o.selectedclass ? o.selectedclass : false,

				hc : o.helperclass ? o.helperclass : false,

				onselect : o.onselect ? o.onselect : false,

				onselectstop : o.onselectstop ? o.onselectstop : false

			};

			this.f.el = jQuery('.' + o.accept);

			jQuery(this).bind('mousedown', jQuery.selectstart).css('position', 'relative');

		}

	);

};