source: main/trunk/greenstone3/web/interfaces/default/js/zoomer.js@ 33156

(function ($)
{
    $.anythingZoomer = 
    {
        defaults: 
        {
            smallArea: "#small",
            largeArea: "#large",
            zoomPort: "#overlay",
            mover: "#mover",
            expansionSize: 30,
            speedMultiplier: 1.5
        }
    }
    $.fn.extend(
    {
        anythingZoomer: function (config)
        {
            var config = $.extend({}, $.anythingZoomer.defaults, config);
            var wrap = $(this);
            var smallArea = $(config.smallArea);
            var largeArea = $(config.largeArea);
            var zoomPort = $(config.zoomPort);
            var mover = $(config.mover);
            var expansionSize = config.expansionSize;
            var speedMultiplier = config.speedMultiplier;
            var over = false;

            function setup(smallArea, largeArea, wrap, zoomPort, mover, expansionSize, speedMultiplier)
            {
                smallArea.show();
                zoomPort.fadeIn();
                mover.css(
                {
                    width: mover.data("origWidth"),
                    height: mover.data("origHeight"),
                    overflow: "hidden",
                    position: "absolute"
                })
                wrap.css(
                {
                    //width: "auto"
                }).mousemove(function (e,pageX,pageY)
                {
                        if (!e.pageX) { e.pageX = pageX }
                        if (!e.pageY) { e.pageY = pageY }

                    var x = e.pageX - smallArea.offset().left;
                    var y = e.pageY - smallArea.offset().top;

                    if ((x < -expansionSize) || (x > smallArea.width() + expansionSize) || (y < -expansionSize) || (y > smallArea.height() + expansionSize))
                    {
                        if (over)
                        {
                            mover.fadeOut(50);
                            over = false;
                        }
                        return;
                    }
                    else
                    {
                        if (!over && _imageZoomEnabled)
                        {
                            mover.fadeIn();
                            over = true;
                        }
                    }

                    mover.css(
                    {
                        top: y - (mover.height() / 2),
                        left: x - (mover.width() / 2)
                    });
                    largeArea.css(
                    {
                        left: (-(e.pageX - smallArea.offset().left) * speedMultiplier) + (mover.width() / 2),
                        top: (-(e.pageY - smallArea.offset().top) * speedMultiplier) + (mover.height() / 2),
                    });
                }).dblclick(function ()
                {
                    image = largeArea.children("img");
                    document.location.href = image.attr("src");
                });
            };

            mover.data("origWidth", mover.width()).data("origHeight", mover.height());
            // Because the largeArea is often hidden, the width() function returns zero, take width from CSS instead  
            largeArea.data("origWidth", largeArea.css("width"));
            setup(smallArea, largeArea, wrap, zoomPort, mover, expansionSize, speedMultiplier);
            return this;
        }
    });
})(jQuery);