/**

* jQuery.smoothDivScroll - Smooth div scrolling using jQuery.

* This plugin is for turning a set of HTML elements's into a smooth scrolling area.

*

* Copyright (c) 2009 Thomas Kahn - thomas.kahn(at)karnhuset(dot)net

*

* This plugin is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* any later version.

*

* This plugin is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU General Public License for more details. <http://www.gnu.org/licenses/>.

*

* Date: 2009-07-05

* @author Thomas Kahn

* @version 0.9

*

* Changelog

* ---------------------------------------------

* 0.9	- Bugfixes: Problem with multiple autoscrollers on the same page - the intervals

*		  where global which resulted in the wrong autoscroller stopping on mouseOver or

*		  mouseDown.

*		  Error in calculation in autoscrolling mode that made the autoscrolling grind

*		  to a halt after a number of loops.

*

* 0.8   - Major update. New parameter setup. Lots of new autoscrolling capabilities and 

*		  new parameters for controlling the scrolling speed. Made it possible to start 

*		  the scroller at a specific element.

* 

* 0.7   - Added support for autoscrolling after the page has loaded. 

*         Added support for making the hot spots visible at start for X number of seconds

*         or visible all the time.

*

* 0.6   - First version.

*/



(function ($) {
    jQuery.fn.smoothDivScroll = function (options) {
        var defaults = { scrollingHotSpotLeft: "div.scrollingHotSpotLeft", scrollingHotSpotRight: "div.scrollingHotSpotRight", scrollWrapper: "div.scrollWrapper", scrollableArea: "div.scrollableArea", hiddenOnStart: false, ajaxContentURL: "", countOnlyClass: "", scrollingSpeed: 25, mouseDownSpeedBooster: 3, autoScroll: "", autoScrollDirection: "right", autoScrollSpeed: 1, pauseAutoScroll: "", visibleHotSpots: "", hotSpotsVisibleTime: 5, startAtElementId: "" }; options = $.extend(defaults, options); return this.each(function () {
            var $mom = $(this); if (options.ajaxContentURL.length !== 0) {
                $mom.scrollableAreaWidth = 0; $mom.find(options.scrollableArea).load((options.ajaxContentURL), function () {
                    $mom.find(options.scrollableArea).children((options.countOnlyClass)).each(function () { $mom.scrollableAreaWidth = $mom.scrollableAreaWidth + $(this).outerWidth(true); }); $mom.find(options.scrollableArea).css("width", ($mom.scrollableAreaWidth + "px")); if (options.hiddenOnStart) { $mom.hide(); }

                    windowIsResized(); setHotSpotHeightForIE();
                });
            }

            var scrollXpos; var booster; var motherElementOffset = $mom.offset().left; var hotSpotWidth = 0; booster = 1; var hasExtended = false; $(window).one("load", function () {
                if (options.ajaxContentURL.length === 0) {
                    $mom.scrollableAreaWidth = 0; $mom.tempStartingPosition = 0; $mom.find(options.scrollableArea).children((options.countOnlyClass)).each(function () {
                        if ((options.startAtElementId.length !== 0) && (($(this).attr("id")) == options.startAtElementId)) { $mom.tempStartingPosition = $mom.scrollableAreaWidth; }

                        $mom.scrollableAreaWidth = $mom.scrollableAreaWidth + $(this).outerWidth(true);
                    }); $mom.find(options.scrollableArea).css("width", $mom.scrollableAreaWidth + "px"); if (options.hiddenOnStart) { $mom.hide(); } 
                }

                $mom.find(options.scrollWrapper).scrollLeft($mom.tempStartingPosition); if (options.autoScroll !== "") { $mom.autoScrollInterval = setInterval(autoScroll, 6); }

                if (options.autoScroll == "always")

                { hideLeftHotSpot(); hideRightHotSpot(); }

                switch (options.visibleHotSpots)

                { case "always": makeHotSpotBackgroundsVisible(); break; case "onstart": makeHotSpotBackgroundsVisible(); $mom.hideHotSpotBackgroundsInterval = setInterval(hideHotSpotBackgrounds, (options.hotSpotsVisibleTime * 1000)); break; default: break; } 
            }); $mom.find(options.scrollingHotSpotRight, options.scrollingHotSpotLeft).one('mouseover', function () { if (options.autoScroll == "onstart") { clearInterval($mom.autoScrollInterval); } }); $(window).bind("resize", function () { windowIsResized(); }); function windowIsResized() {
                if (!(options.hiddenOnStart))

                { $mom.scrollableAreaWidth = 0; $mom.find(options.scrollableArea).children((options.countOnlyClass)).each(function () { $mom.scrollableAreaWidth = $mom.scrollableAreaWidth + $(this).outerWidth(true); }); $mom.find(options.scrollableArea).css("width", $mom.scrollableAreaWidth + 'px'); }

                $mom.find(options.scrollWrapper).scrollLeft("0"); var bodyWidth = $("body").innerWidth(); if (options.autoScroll !== "always") {
                    if ($mom.scrollableAreaWidth < bodyWidth)

                    { hideLeftHotSpot(); hideRightHotSpot(); }

                    else

                    { showHideHotSpots(); } 
                } 
            }

            function hideLeftHotSpot() { $mom.find(options.scrollingHotSpotLeft).hide(); }

            function hideRightHotSpot() { $mom.find(options.scrollingHotSpotRight).hide(); }


            function showLeftHotSpot() { $mom.find(options.scrollingHotSpotLeft).show(); if (hotSpotWidth <= 0) { hotSpotWidth = $mom.find(options.scrollingHotSpotLeft).width(); } }

            function showRightHotSpot() { $mom.find(options.scrollingHotSpotRight).show(); if (hotSpotWidth <= 0) { hotSpotWidth = $mom.find(options.scrollingHotSpotRight).width(); } }

            
            
            
            function setHotSpotHeightForIE() {
                jQuery.each(jQuery.browser, function (i, val) {
                    if (i == "msie" && jQuery.browser.version.substr(0, 1) == "6")

                    { $mom.find(options.scrollingHotSpotLeft).css("height", ($mom.find(options.scrollableArea).innerHeight())); $mom.find(options.scrollingHotSpotRight).css("height", ($mom.find(options.scrollableArea).innerHeight())); } 
                });
            }

            $mom.find(options.scrollingHotSpotRight).bind('mousemove', function (e) { var x = e.pageX - (this.offsetLeft + motherElementOffset); scrollXpos = Math.round((x / hotSpotWidth) * options.scrollingSpeed); if (scrollXpos === Infinity) { scrollXpos = 0; } }); $mom.find(options.scrollingHotSpotRight).bind('mouseover', function () {
                if (options.autoScroll == "onstart") { clearInterval($mom.autoScrollInterval); }

                $mom.rightScrollInterval = setInterval(doScrollRight, 6);
            }); $mom.find(options.scrollingHotSpotRight).bind('mouseout', function () { clearInterval($mom.rightScrollInterval); scrollXpos = 0; }); $mom.find(options.scrollingHotSpotRight).bind('mousedown', function () { booster = options.mouseDownSpeedBooster; }); $("*").bind('mouseup', function () { booster = 1; }); var doScrollRight = function () {
                if (scrollXpos > 0) { $mom.find(options.scrollWrapper).scrollLeft($mom.find(options.scrollWrapper).scrollLeft() + (scrollXpos * booster)); }

                showHideHotSpots();
            }; if (options.pauseAutoScroll == "mousedown" && options.autoScroll == "always")

            { $mom.find(options.scrollWrapper).bind('mousedown', function () { clearInterval($mom.autoScrollInterval); }); $mom.find(options.scrollWrapper).bind('mouseup', function () { $mom.autoScrollInterval = setInterval(autoScroll, 6); }); }

            else if (options.pauseAutoScroll == "mouseover" && options.autoScroll == "always")

            { $mom.find(options.scrollWrapper).bind('mouseover', function () { clearInterval($mom.autoScrollInterval); }); $mom.find(options.scrollWrapper).bind('mouseout', function () { $mom.autoScrollInterval = setInterval(autoScroll, 6); }); }

            $mom.previousScrollLeft = 0; $mom.pingPongDirection = "right"; $mom.swapAt; $mom.getNextElementWidth = true; var autoScroll = function () {
                if (options.autoScroll == "onstart") { showHideHotSpots(); }

                switch (options.autoScrollDirection) {
                    case "right": $mom.find(options.scrollWrapper).scrollLeft($mom.find(options.scrollWrapper).scrollLeft() + options.autoScrollSpeed); break; case "left": $mom.find(options.scrollWrapper).scrollLeft($mom.find(options.scrollWrapper).scrollLeft() - options.autoScrollSpeed); break; case "backandforth": $mom.previousScrollLeft = $mom.find(options.scrollWrapper).scrollLeft(); if ($mom.pingPongDirection == "right") { $mom.find(options.scrollWrapper).scrollLeft($mom.find(options.scrollWrapper).scrollLeft() + options.autoScrollSpeed); }

                        else { $mom.find(options.scrollWrapper).scrollLeft($mom.find(options.scrollWrapper).scrollLeft() - options.autoScrollSpeed); }

                        if ($mom.previousScrollLeft === $mom.find(options.scrollWrapper).scrollLeft()) {
                            if ($mom.pingPongDirection == "right") { $mom.pingPongDirection = "left"; }

                            else { $mom.pingPongDirection = "right"; } 
                        }

                        break; case "endlessloop": if ($mom.getNextElementWidth) {
                            if (options.startAtElementId !== "") { $mom.swapAt = $("#" + options.startAtElementId).outerWidth(); }

                            else { $mom.swapAt = $mom.find(options.scrollableArea).children(":first-child").outerWidth(); }

                            $mom.getNextElementWidth = false;
                        }

                        $mom.find(options.scrollWrapper).scrollLeft($mom.find(options.scrollWrapper).scrollLeft() + options.autoScrollSpeed); if (($mom.swapAt <= $mom.find(options.scrollWrapper).scrollLeft()))

                        { $mom.find(options.scrollableArea).append($mom.find(options.scrollableArea).children(":first-child").clone()); $mom.find(options.scrollWrapper).scrollLeft(($mom.find(options.scrollWrapper).scrollLeft() - $mom.find(options.scrollableArea).children(":first-child").outerWidth())); $mom.find(options.scrollableArea).children(":first-child").remove(); $mom.getNextElementWidth = true; }

                        break; default: break;
                } 
            }; $mom.find(options.scrollingHotSpotLeft).bind('mousemove', function (e) {
                var x = $mom.find(options.scrollingHotSpotLeft).innerWidth() - (e.pageX - motherElementOffset); scrollXpos = Math.round((x / hotSpotWidth) * options.scrollingSpeed); if (scrollXpos === Infinity)

                { scrollXpos = 0; } 
            }); $mom.find(options.scrollingHotSpotLeft).bind('mouseover', function () {
                if (options.autoScroll == "onstart") { clearInterval($mom.autoScrollInterval); }

                $mom.leftScrollInterval = setInterval(doScrollLeft, 6);
            }); $mom.find(options.scrollingHotSpotLeft).bind('mouseout', function () { clearInterval($mom.leftScrollInterval); scrollXpos = 0; }); $mom.find(options.scrollingHotSpotLeft).bind('mousedown', function () { booster = options.mouseDownSpeedBooster; }); var doScrollLeft = function () {
                if (scrollXpos > 0) { $mom.find(options.scrollWrapper).scrollLeft($mom.find(options.scrollWrapper).scrollLeft() - (scrollXpos * booster)); }

                showHideHotSpots();
            }; function showHideHotSpots() {
                if ($mom.find(options.scrollWrapper).scrollLeft() === 0)

                { hideLeftHotSpot(); showRightHotSpot(); }

                else if (($mom.scrollableAreaWidth) <= ($mom.find(options.scrollWrapper).innerWidth() + $mom.find(options.scrollWrapper).scrollLeft()))

                { hideRightHotSpot(); showLeftHotSpot(); }

                else

                { showRightHotSpot(); showLeftHotSpot(); } 
            }

            function makeHotSpotBackgroundsVisible()

            { $mom.find(options.scrollingHotSpotLeft).addClass("scrollingHotSpotLeftVisible"); $mom.find(options.scrollingHotSpotRight).addClass("scrollingHotSpotRightVisible"); }

            function hideHotSpotBackgrounds()

            { clearInterval($mom.hideHotSpotBackgroundsInterval); $mom.find(options.scrollingHotSpotLeft).fadeTo("slow", 0.0, function () { $mom.find(options.scrollingHotSpotLeft).removeClass("scrollingHotSpotLeftVisible"); }); $mom.find(options.scrollingHotSpotRight).fadeTo("slow", 0.0, function () { $mom.find(options.scrollingHotSpotRight).removeClass("scrollingHotSpotRightVisible"); }); } 
        });
    };
})(jQuery);