/*
* jQuery.splitter.js - two-pane splitter window plugin
*
* version 1.6 (2010/01/03) 
* 
* Dual licensed under the MIT and GPL licenses: 
*   http://www.opensource.org/licenses/mit-license.php 
*   http://www.gnu.org/licenses/gpl.html 
*/

/**
* The splitter() plugin implements a two-pane resizable splitter window.
* The selected elements in the jQuery object are converted to a splitter;
* each selected element should have two child elements, used for the panes
* of the splitter. The plugin adds a third child element for the splitbar.
* 
* For more details see: http://methvin.com/jquery/splitter/
*
*
* @example $('#MySplitter').splitter();
* @desc Create a vertical splitter with default settings 
*
* @example $('#MySplitter').splitter({type: 'h', accessKey: 'M'});
* @desc Create a horizontal splitter resizable via Alt+Shift+M
*
* @name splitter
* @type jQuery
* @param Object options Options for the splitter (not required)
* @cat Plugins/Splitter
* @return jQuery
* @author Dave Methvin (dave.methvin@gmail.com)
*/
; (function ($) {

    var splitterCounter = 0;

    $.fn.splitter = function (args) {
        args = args || {};
        return this.each(function () {
            if ($(this).is(".splitter"))  // already a splitter
                return;
            var zombie;     // left-behind splitbar for outline resizes
            function setBarState(state) {
                bar.removeClass(opts.barStateClasses).addClass(state);
            }
            function startSplitMouse(evt) {
                if (evt.which != 1)
                    return;     // left button only
                bar.removeClass(opts.barHoverClass);
                if (opts.outline) {
                    zombie = zombie || bar.clone(false).insertAfter(A);
                    bar.removeClass(opts.barDockedClass);
                }
                setBarState(opts.barActiveClass)
                // Safari selects A/B text on a move; iframes capture mouse events so hide them
                panes.css("-webkit-user-select", "none").find("iframe").addClass(opts.iframeClass);
                A._posSplit = A[0][opts.pxSplit] - evt[opts.eventPos];
                $(document)
                .bind("mousemove" + opts.eventNamespace, doSplitMouse)
                .bind("mouseup" + opts.eventNamespace, endSplitMouse);
            }
            function doSplitMouse(evt) {
                var pos = A._posSplit + evt[opts.eventPos],
                range = Math.max(0, Math.min(pos, splitter._DA - bar._DA)),
                limit = Math.max(A._min, splitter._DA - B._max,
                        Math.min(pos, A._max, splitter._DA - bar._DA - B._min));
                if (opts.outline) {
                    // Let docking splitbar be dragged to the dock position, even if min width applies
                    if ((opts.dockPane == A && pos < Math.max(A._min, bar._DA)) ||
                     (opts.dockPane == B && pos > Math.min(pos, A._max, splitter._DA - bar._DA - B._min))) {
                        bar.addClass(opts.barDockedClass).css(opts.origin, range);
                    }
                    else {
                        bar.removeClass(opts.barDockedClass).css(opts.origin, limit);
                    }
                    bar._DA = bar[0][opts.pxSplit];
                } else
                    resplit(pos);
                setBarState(pos == limit ? opts.barActiveClass : opts.barLimitClass);
            }
            function endSplitMouse(evt) {
                setBarState(opts.barNormalClass);
                bar.addClass(opts.barHoverClass);
                var pos = A._posSplit + evt[opts.eventPos];
                if (opts.outline) {
                    zombie.remove(); zombie = null;
                    resplit(pos);
                }
                panes.css("-webkit-user-select", "text").find("iframe").removeClass(opts.iframeClass);
                $(document)
                .unbind("mousemove" + opts.eventNamespace + " mouseup" + opts.eventNamespace);
            }
            function resplit(pos) {
                bar._DA = bar[0][opts.pxSplit];     // bar size may change during dock
                // Constrain new splitbar position to fit pane size and docking limits
                if ((opts.dockPane == A && pos < Math.max(A._min, bar._DA)) ||
                 (opts.dockPane == B && pos > Math.min(pos, A._max, splitter._DA - bar._DA - B._min))) {
                    bar.addClass(opts.barDockedClass);
                    bar._DA = bar[0][opts.pxSplit];
                    pos = opts.dockPane == A ? 0 : splitter._DA - bar._DA;
                    if (bar._pos == null)
                        bar._pos = A[0][opts.pxSplit];
                }
                else {
                    bar.removeClass(opts.barDockedClass);
                    bar._DA = bar[0][opts.pxSplit];
                    bar._pos = null;
                    pos = Math.max(A._min, splitter._DA - B._max,
                        Math.min(pos, A._max, splitter._DA - bar._DA - B._min));
                }
                // Resize/position the two panes
                bar.css(opts.origin, pos).css(opts.fixed, splitter._DF);
                A.css(opts.origin, 0).css(opts.split, pos).css(opts.fixed, splitter._DF);
                B.css(opts.origin, pos + bar._DA)
                .css(opts.split, splitter._DA - bar._DA - pos).css(opts.fixed, splitter._DF);
                // IE fires resize for us; all others pay cash
                if (!$.browser.msie)
                    panes.trigger("resize");
            }
            function dimSum(jq, dims) {
                // Opera returns -1 for missing min/max width, turn into 0
                var sum = 0;
                for (var i = 1; i < arguments.length; i++)
                    sum += Math.max(parseInt(jq.css(arguments[i]), 10) || 0, 0);
                return sum;
            }

            // Determine settings based on incoming opts, element classes, and defaults
            var vh = (args.splitHorizontal ? 'h' : args.splitVertical ? 'v' : args.type) || 'v';
            var opts = $.extend({
                // Defaults here allow easy use with ThemeRoller
                splitterClass: "splitter ui-widget ui-widget-content",
                paneClass: "splitter-pane",
                barClass: "splitter-bar",
                barNormalClass: "ui-state-default",         // splitbar normal
                barHoverClass: "ui-state-hover",           // splitbar mouse hover
                barActiveClass: "ui-state-highlight",       // splitbar being moved
                barLimitClass: "ui-state-error",           // splitbar at limit
                iframeClass: "splitter-iframe-hide",     // hide iframes during split
                eventNamespace: ".splitter" + (++splitterCounter),
                pxPerKey: 8,            // splitter px moved per keypress
                tabIndex: 0,            // tab order indicator
                accessKey: ''           // accessKey for splitbar
            }, {
                // user can override
                v: {                    // Vertical splitters:
                    keyLeft: 39, keyRight: 37, cursor: "e-resize",
                    barStateClass: "splitter-bar-vertical",
                    barDockedClass: "splitter-bar-vertical-docked"
                },
                h: {                    // Horizontal splitters:
                    keyTop: 40, keyBottom: 38, cursor: "n-resize",
                    barStateClass: "splitter-bar-horizontal",
                    barDockedClass: "splitter-bar-horizontal-docked"
                }
            }[vh], args, {
                // user cannot override
                v: {                    // Vertical splitters:
                    type: 'v', eventPos: "pageX", origin: "left",
                    split: "width", pxSplit: "offsetWidth", side1: "Left", side2: "Right",
                    fixed: "height", pxFixed: "offsetHeight", side3: "Top", side4: "Bottom"
                },
                h: {                    // Horizontal splitters:
                    type: 'h', eventPos: "pageY", origin: "top",
                    split: "height", pxSplit: "offsetHeight", side1: "Top", side2: "Bottom",
                    fixed: "width", pxFixed: "offsetWidth", side3: "Left", side4: "Right"
                }
            }[vh]);
            opts.barStateClasses = [opts.barNormalClass, opts.barHoverClass, opts.barActiveClass, opts.barLimitClass].join(' ');

            // Create jQuery object closures for splitter and both panes
            var splitter = $(this).css({ position: "relative" }).addClass(opts.splitterClass);
            var panes = $(">*", splitter[0]).addClass(opts.paneClass).css({
                position: "absolute",           // positioned inside splitter container
                "z-index": "1",                 // splitbar is positioned above
                "-moz-outline-style": "none"    // don't show dotted outline
            });
            var A = $(panes[0]), B = $(panes[1]);   // A = left/top, B = right/bottom
            opts.dockPane = opts.dock && (/right|bottom/.test(opts.dock) ? B : A);

            // Focuser element, provides keyboard support; title is shown by Opera accessKeys
            var focuser = $('<a href="javascript:void(0)"></a>')
            .attr({ accessKey: opts.accessKey, tabIndex: opts.tabIndex, title: opts.splitbarClass })
            .bind(($.browser.opera ? "click" : "focus") + opts.eventNamespace,
                function () { this.focus(); bar.addClass(opts.barActiveClass) })
            .bind("keydown" + opts.eventNamespace, function (e) {
                var key = e.which || e.keyCode;
                var dir = key == opts["key" + opts.side1] ? 1 : key == opts["key" + opts.side2] ? -1 : 0;
                if (dir)
                    resplit(A[0][opts.pxSplit] + dir * opts.pxPerKey, false);
            })
            .bind("blur" + opts.eventNamespace,
                function () { bar.removeClass(opts.barActiveClass) });

            // Splitbar element
            var bar = $('<div></div>')
            .insertAfter(A).addClass(opts.barClass).addClass(opts.barStateClass)
            .append(focuser).attr({ unselectable: "on" })
            .css({ position: "absolute", "user-select": "none", "-webkit-user-select": "none",
                "-khtml-user-select": "none", "-moz-user-select": "none", "z-index": "100"
            })
            .bind("mousedown" + opts.eventNamespace, startSplitMouse)
            .bind("mouseover" + opts.eventNamespace, function () {
                $(this).addClass(opts.barHoverClass);
            })
            .bind("mouseout" + opts.eventNamespace, function () {
                $(this).removeClass(opts.barHoverClass);
            });
            // Use our cursor unless the style specifies a non-default cursor
            if (/^(auto|default|)$/.test(bar.css("cursor")))
                bar.css("cursor", opts.cursor);

            // Cache several dimensions for speed, rather than re-querying constantly
            // These are saved on the A/B/bar/splitter jQuery vars, which are themselves cached
            // DA=dimension adjustable direction, PBF=padding/border fixed, PBA=padding/border adjustable
            bar._DA = bar[0][opts.pxSplit];
            splitter._PBF = dimSum(splitter, "border" + opts.side3 + "Width", "border" + opts.side4 + "Width");
            splitter._PBA = dimSum(splitter, "border" + opts.side1 + "Width", "border" + opts.side2 + "Width");
            A._pane = opts.side1;
            B._pane = opts.side2;
            $.each([A, B], function () {
                this._splitter_style = this.style;
                this._min = opts["min" + this._pane] || dimSum(this, "min-" + opts.split);
                this._max = opts["max" + this._pane] || dimSum(this, "max-" + opts.split) || 9999;
                this._init = opts["size" + this._pane] === true ?
                parseInt($.curCSS(this[0], opts.split), 10) : opts["size" + this._pane];
            });

            // Determine initial position, get from cookie if specified
            var initPos = A._init;
            if (!isNaN(B._init))  // recalc initial B size as an offset from the top or left side
                initPos = splitter[0][opts.pxSplit] - splitter._PBA - B._init - bar._DA;
            if (opts.cookie) {
                if (!$.cookie)
                    alert('jQuery.splitter(): jQuery cookie plugin required');
                initPos = parseInt($.cookie(opts.cookie), 10);
                $(window).bind("unload" + opts.eventNamespace, function () {
                    var state = String(bar.css(opts.origin));   // current location of splitbar
                    $.cookie(opts.cookie, state, { expires: opts.cookieExpires || 365,
                        path: opts.cookiePath || document.location.pathname
                    });
                });
            }
            if (isNaN(initPos))   // King Solomon's algorithm
                initPos = Math.round((splitter[0][opts.pxSplit] - splitter._PBA - bar._DA) / 2);

            // Resize event propagation and splitter sizing
            if (opts.anchorToWindow)
                opts.resizeTo = window;
            if (opts.resizeTo) {
                splitter._hadjust = dimSum(splitter, "borderTopWidth", "borderBottomWidth", "marginBottom");
                splitter._hmin = Math.max(dimSum(splitter, "minHeight"), 20);
                $(window).bind("resize" + opts.eventNamespace, function () {
                    var top = splitter.offset().top;
                    var eh = $(opts.resizeTo).height();
                    splitter.css("height", Math.max(eh - top - splitter._hadjust, splitter._hmin) + "px");
                    if (!$.browser.msie) splitter.trigger("resize");
                }).trigger("resize" + opts.eventNamespace);
            }
            else if (opts.resizeToWidth && !$.browser.msie) {
                $(window).bind("resize" + opts.eventNamespace, function () {
                    splitter.trigger("resize");
                });
            }

            // Docking support
            if (opts.dock) {
                splitter
                .bind("toggleDock" + opts.eventNamespace, function () {
                    var pw = opts.dockPane[0][opts.pxSplit];
                    splitter.trigger(pw ? "dock" : "undock");
                })
                .bind("dock" + opts.eventNamespace, function () {
                    var pw = A[0][opts.pxSplit];
                    if (!pw) return;
                    bar._pos = pw;
                    var x = {};
                    x[opts.origin] = opts.dockPane == A ? 0 :
                        splitter[0][opts.pxSplit] - splitter._PBA - bar[0][opts.pxSplit];
                    bar.animate(x, opts.dockSpeed || 1, opts.dockEasing, function () {
                        bar.addClass(opts.barDockedClass);
                        resplit(x[opts.origin]);
                    });
                })
                .bind("undock" + opts.eventNamespace, function () {
                    var pw = opts.dockPane[0][opts.pxSplit];
                    if (pw) return;
                    var x = {}; x[opts.origin] = bar._pos + "px";
                    bar.removeClass(opts.barDockedClass)
                        .animate(x, opts.undockSpeed || opts.dockSpeed || 1, opts.undockEasing || opts.dockEasing, function () {
                            resplit(bar._pos);
                            bar._pos = null;
                        });
                });
                if (opts.dockKey)
                    $('<a title="' + opts.splitbarClass + ' toggle dock" href="javascript:void(0)"></a>')
                    .attr({ accessKey: opts.dockKey, tabIndex: -1 }).appendTo(bar)
                    .bind($.browser.opera ? "click" : "focus", function () {
                        splitter.trigger("toggleDock"); this.blur();
                    });
                bar.bind("dblclick", function () { splitter.trigger("toggleDock"); })
            }


            // Resize event handler; triggered immediately to set initial position
            splitter
            .bind("destroy" + opts.eventNamespace, function () {
                $([window, document]).unbind(opts.eventNamespace);
                bar.unbind().remove();
                panes.removeClass(opts.paneClass);
                splitter
                    .removeClass(opts.splitterClass)
                    .add(panes)
                        .unbind(opts.eventNamespace)
                        .attr("style", function (el) {
                            return this._splitter_style || "";    //TODO: save style
                        });
                splitter = bar = focuser = panes = A = B = opts = args = null;
            })
            .bind("resize" + opts.eventNamespace, function (e, size) {
                // Custom events bubble in jQuery 1.3; avoid recursion
                if (e.target != this) return;
                // Determine new width/height of splitter container
                splitter._DF = splitter[0][opts.pxFixed] - splitter._PBF;
                splitter._DA = splitter[0][opts.pxSplit] - splitter._PBA;
                // Bail if splitter isn't visible or content isn't there yet
                if (splitter._DF <= 0 || splitter._DA <= 0) return;
                // Re-divvy the adjustable dimension; maintain size of the preferred pane
                resplit(!isNaN(size) ? size : (!(opts.sizeRight || opts.sizeBottom) ? A[0][opts.pxSplit] :
                    splitter._DA - B[0][opts.pxSplit] - bar._DA));
                setBarState(opts.barNormalClass);
            })
            .trigger("resize", [initPos]);
        });
    };

})(jQuery);