/**
 * Created by chen on 2017/10/31.
 */

jQuery.bootstrapLoading = {
    isLoading: function () {
        return $('#loadingPage').is(':visible');
    },
    start: function (options) {
        var defaults = {
            opacity: 0.5,
            //loading页面透明度
            // backgroundColor: "#FFFFFF",
            //loading页面背景色
            borderColor: "#bbb",
            //提示边框颜色
            borderWidth: 1,
            //提示边框宽度
            borderStyle: "solid",
            //提示边框样式
            loadingTips: "Loading, please wait...",
            //提示文本
            TipsColor: "#fff",
            //提示颜色
            delayTime: 500,
            //页面加载完成后，加载页面渐出速度
            zindex: 2000,
            //loading页面层次
            sleep: 0
            //设置挂起,等于0时则无需挂起

        }
        var options = $.extend(defaults, options);

        //获取页面宽高
        var _PageHeight = document.documentElement.clientHeight,
            _PageWidth = document.documentElement.clientWidth;

        //在页面未加载完毕之前显示的loading Html自定义内容
        //var _LoadingHtml = '<div id="loadingPage" style="position:fixed;left:0;top:0;_position: absolute;width:100%;height:' + _PageHeight + 'px;background:' + options.backgroundColor + ';opacity:' + options.opacity + ';filter:alpha(opacity=' + options.opacity * 100 + ');z-index:' + options.zindex + ';"><div id="loadingTips" style="position: absolute; cursor1: wait; width: auto;border-color:' + options.borderColor + ';border-style:' + options.borderStyle + ';border-width:' + options.borderWidth + 'px; height:80px; line-height:80px; padding-left:80px; padding-right: 5px;border-radius:10px;  background: ' + options.backgroundColor + ' url(/Content/bootstrap-loading/images/loading.gif) no-repeat 5px center; color:' + options.TipsColor + ';font-size:20px;">' + options.loadingTips + '</div></div>';
        var _LoadingHtml = '<div id="loadingPage" tabindex="-1" style="position:fixed;left:0;top:0;_position: absolute;width:100%;height:' + _PageHeight + 'px;background:' + options.backgroundColor + ';opacity:' + options.opacity + ';filter:alpha(opacity=' + options.opacity * 100 + ');z-index:' + options.zindex + ';"><div id="loadingTips" style="position: absolute; cursor1: wait; width: auto;">' +'<div class="text-green"><i class="fa fa-spinner fa-pulse fa-3x fa-fw"></i> <span class="sr-only">Loading...</span> </div> </div><input type="text" id="loadingFocus"></div>';
        //呈现loading效果
        $("body").append(_LoadingHtml);
        //获取loading提示框宽高
        var _LoadingTipsH = document.getElementById("loadingTips").clientHeight,
            _LoadingTipsW = document.getElementById("loadingTips").clientWidth;

        //计算距离，让loading提示框保持在屏幕上下左右居中
        var _LoadingTop = _PageHeight > _LoadingTipsH ? (_PageHeight - _LoadingTipsH) / 2 : 0,
            _LoadingLeft = _PageWidth > _LoadingTipsW ? (_PageWidth - _LoadingTipsW) / 2 : 0;

        $("#loadingTips").css({
            "left": _LoadingLeft + "px",
            "top": _LoadingTop + "px"
        });

        //监听页面加载状态
        document.onreadystatechange = PageLoaded;
        //当页面加载完成后执行
        function PageLoaded() {
            if (document.readyState == "complete") {
                var loadingMask = $('#loadingPage');

                setTimeout(function () {
                        loadingMask.animate({
                                "opacity": 0
                            },
                            options.delayTime,
                            function () {
                                $(this).hide();

                            });
                        setTimeout(function () {
                            $('#loadingFocus')[0].focus();
                        }, 200);

                    },
                    options.sleep);

            }
        }
    },
    end: function () {
        $("#loadingPage").remove();
    }
}