js ol.ui.mask

<!-- lang: js -->
/**
 * Masker V0.2
 * Last Update:2011-01-27
 *
 * FOR: IE6,IE7,IE8,Firefox
 * Usage:
 *  cv.ui.masker.mask();
 *  cv.ui.masker.unmask();
 */
(function(){
    var resize_function=function(){
        var css={};
        css.width=cv.ui.masker._bwidth;
        css.height=cv.ui.masker._bheight;
        cv.Cache.get("cv_mask").css(css);
    };
    var _default={
        css:{
            opacity:0.55,
            background:"#fff"
        }
    };
    cv.ui.masker={
        isShown:false,
        mask:function(options){
            var $=jQuery;
            var thix=cv.ui.masker;
            if(thix.isShown)return;
            options  = $.extend(true,{},_default, options);
            var mask=cv.Cache.get("cv_mask",function(){
                //init
                $(window).resize(function(){
                    if(cv.ui.masker.isShown)return;
                    cv.Cache.get("cv_mask").css({
                        width: thix._bwidth(),
                        height: thix._bheight()
                    });
                });
                return $("<div id='cv_mask' class='cv_mask'></div>").appendTo('body').bgiframe();
            });
            //cv.Cache.get end

            /*if ($.browser.msie) {
                w= document.compatMode == "CSS1Compat" ? document.documentElement.clientWidth : document.body.clientWidth;
            } else {
                w= thix._bwidth();
            }
            h= thix._bheight();*/
            thix.isShown=true;
            options.css.width=thix._bwidth();
            options.css.height=thix._bheight();
            options.css.visibility="visible";
            mask.css(options.css);
            $(window).bind("resize",resize_function);
        },
        unmask:function(){
            cv.ui.masker.isShown=false;
            cv.Cache.get("cv_mask").css({
                visibility:"hidden",
                width:0,
                height:0
            });
            jQuery(window).unbind("resize",resize_function);
        },
        //取得遮照高度
        _bheight:function() {
            var $=jQuery;
            if ($.browser.msie && $.browser.version < 7) {
                var scrollHeight = Math.max(
                    document.documentElement.scrollHeight,
                    document.body.scrollHeight
                );
                var offsetHeight = Math.max(
                    document.documentElement.offsetHeight,
                    document.body.offsetHeight
                );

                if (scrollHeight < offsetHeight) {
                    return $(window).height();
                } else {
                    return scrollHeight;
                }
            } else {
                return $(document).height();
            }
        },
        //取得遮照宽度
        _bwidth:function() {
            var $=jQuery;
            if ($.browser.msie && $.browser.version < 7) {
                var scrollWidth = Math.max(
                    document.documentElement.scrollWidth,
                    document.body.scrollWidth
                );
                var offsetWidth = Math.max(
                    document.documentElement.offsetWidth,
                    document.body.offsetWidth
                );

                if (scrollWidth < offsetWidth) {
                    return $(window).width();
                } else {
                    return scrollWidth;
                }
            } else {
                return $(document).width();
            }
        }
    };
})();