var Drag = {
    "obj": null,
    "init": function(handle, dragBody, e) {
        if (e == null) {
            handle.onmousedown = Drag.start;
        }
        handle.root = dragBody;

        if (isNaN(parseInt(handle.root.style.left))) handle.root.style.left = "0px";
        if (isNaN(parseInt(handle.root.style.top))) handle.root.style.top = "0px"; //确保后来能够取得top值
        handle.root.onDragStart = new Function();
        handle.root.onDragEnd = new Function();
        handle.root.onDrag = new Function();
        if (e != null) {
            var handle = Drag.obj = handle;
            e = Drag.fixe(e);
            var top = parseInt(handle.root.style.top);
            var left = parseInt(handle.root.style.left);
            handle.root.onDragStart(left, top, e.pageX, e.pageY);
            handle.lastMouseX = e.pageX;
            handle.lastMouseY = e.pageY;
            document.onmousemove = Drag.drag;
            document.onmouseup = Drag.end;
        }
    },
    "start": function(e) {
        var handle = Drag.obj = this;
        e = Drag.fixEvent(e);
        var top = parseInt(handle.root.style.top);
        var left = parseInt(handle.root.style.left);
        //alert(left)
        //一般情况下 left top 在初始的时候都为0
        handle.root.onDragStart(left, top, e.pageX, e.pageY);
        handle.lastMouseX = e.pageX;
        handle.lastMouseY = e.pageY;
        document.onmousemove = Drag.drag;
        document.onmouseup = Drag.end;
        return false;
    },
    "drag": function(e) {//这里的this为document 所以拖动对象只能保存在Drag.obj里
        e = Drag.fixEvent(e);
        var handle = Drag.obj;
        var mouseY = e.pageY;
        var mouseX = e.pageX;
        var top = parseInt(handle.root.style.top);
        var left = parseInt(handle.root.style.left); //这里的top和left是handle.root距离浏览器边框的上边距和左边距

        var currentLeft, currentTop;
        currentLeft = left + mouseX - handle.lastMouseX;
        currentTop = top + (mouseY - handle.lastMouseY);

        //上一瞬间的上边距加上鼠标在两个瞬间移动的距离 得到现在的上边距

        handle.root.style.left = currentLeft + "px";
        handle.root.style.top = currentTop + "px";

        //更新当前的位置

        handle.lastMouseX = mouseX;
        handle.lastMouseY = mouseY;

        //保存这一瞬间的鼠标值 用于下一次计算位移

        handle.root.onDrag(currentLeft, currentTop, e.pageX, e.pageY); //调用外面对应的函数
        return false;
    },
    "end": function() {
        document.onmousemove = null;
        document.onmouseup = null;
        Drag.obj.root.onDragEnd(parseInt(Drag.obj.root.style.left), parseInt(Drag.obj.root.style.top));
        Drag.obj = null;
    },
    "fixEvent": function(e) {//格式化事件参数对象
        if (typeof e == "undefined") e = window.event;
        if (typeof e.layerX == "undefined") e.layerX = e.offsetX;
        if (typeof e.layerY == "undefined") e.layerY = e.offsetY;
        if (typeof e.pageX == "undefined") e.pageX = e.clientX + document.body.scrollLeft - document.body.clientLeft;
        if (typeof e.pageY == "undefined") e.pageY = e.clientY + document.body.scrollTop - document.body.clientTop;
        return e;
    }
};

//------------------------Utility------------------------
function findPosX(obj) {//辅助函数 得到元素左边与浏览器左边的边距
    var curleft = 0;
    if (obj && obj.offsetParent) {
        while (obj.offsetParent) {
            curleft += obj.offsetLeft;
            obj = obj.offsetParent;
        }
    } else if (obj && obj.x) curleft += obj.x;
    return curleft; // + document.body.scrollLeft - document.body.clientLeft;
}

function findPosY(obj) {//辅助函数 得到元素上边与浏览器上边的边距
    var curtop = 0;
    if (obj && obj.offsetParent) {
        while (obj.offsetParent) {
            curtop += obj.offsetTop;
            obj = obj.offsetParent;
        }
    } else if (obj && obj.y) curtop += obj.y;
    return curtop; // + document.body.scrollTop - document.body.clientTop;
}


var dragGhost = document.createElement("div");
dragGhost.style.border = "dashed 1px #CCCCCC";
dragGhost.style.background = "white";
dragGhost.style.display = "none";
dragGhost.style.margin = "10px";

var sideBar;
var columns = [];
//------------------------Start Here------------------------
function dragInit(blogID) {
    sideBar = document.getElementById("sideBar");

    for (var i = 0; i < sideBar.childNodes.length; i++) {
        if (sideBar.childNodes[i].className == "column") {//筛选出所有的列 ff下的childNodes不可靠 :\
            columns.push(sideBar.childNodes[i]);
        }
    }
    for (var i = 0; i < columns.length; i++) {
        var column = columns[i];
        for (var j = 0; j < column.childNodes.length; j++) {
            var item = column.childNodes[j];
            if (item.className == "sideModule") {
                item.column = column; //给每个拖拽对象要指明它属于哪一列 而且这个属性会随着拖动而更新的
                new dragItem(item, blogID);
            }
        }
    }
}
var isIE = document.all;

//------------------------Drag Item------------------------
function dragItem(item, blogID) {
    //item实际上是dragBody(拖动的时候移动的整体)
    //在这里需要根据item找到handle(能够拖动的把手)

    var handle;
    for (var i = 0; i < item.childNodes.length; i++) {
        if (item.childNodes[i].nodeName.toLowerCase() == "div") {
            handle = item.childNodes[i];
            //if (i == 1) {
                break;
            //}
        }
    }
    if (!handle) return;
    Drag.init(handle, item);
    item.onDragStart = function(left, top, mouseX, mouseY) {
        //开始拖动的时候设置透明度

        this.style.opacity = "0.5";
        this.style.filter = "alpha(opacity=50)";
        dragGhost.style.height = isIE ? this.offsetHeight + "px" : (this.offsetHeight - 2) + "px";

        //this指的是item

        this.style.width = this.offsetWidth + "px"; //因为初始的width为auto
        this.style.left = findPosX(this) - 5 + "px";
        this.style.top = findPosY(this) - 5 + "px";
        this.style.position = "absolute";

        //将ghost插入到当前位置
        dragGhost.style.display = "block";
        this.column.insertBefore(dragGhost, this);

        //记录每一列的左边距 在拖动过程中判断拖动对象所在的列会用到
        this.columnsX = [];
        for (var i = 0; i < columns.length; i++) {
            this.columnsX.push(findPosX(columns[i]));
        }

    }
    item.onDrag = function(left, top, mouseX, mouseY) {

        //先要判断在哪一列移动
        var columnIndex = 0;

        for (var i = 0; i < this.columnsX.length; i++) {
            if ((left + this.offsetWidth / 2) > this.columnsX[i]) {
                columnIndex = i;
            }
        }
        //如果columnIndex在循环中没有被赋值 则表示当前拖动对象在第一列的左边
        //此时也把它放到第一列

        var column = columns[columnIndex];

        if (this.column != column) {
            //之前拖动对象不在这个列
            //将ghost放置到这一列的最下方

            column.appendChild(dragGhost);
            this.column = column;
        }

        //然后在判断放在这一列的什么位置

        var currentNode = null;
        for (var i = 0; i < this.column.childNodes.length; i++) {
            if (this.column.childNodes[i].className == "sideModule"
			&& this.column.childNodes[i] != this//不能跟拖动元素自己比较 否则不能在本列向下移动
			&& top < findPosY(this.column.childNodes[i])) {//从上到下找到第一个比拖动元素的上边距大的元素

                currentNode = this.column.childNodes[i];
                break;
            }
        }
        if (currentNode)
            this.column.insertBefore(dragGhost, currentNode);
        else//拖到最下边 没有任何一个元素的上边距比拖动元素的top大 则添加到列的最后

            this.column.appendChild(dragGhost);
    }
    item.onDragEnd = function(left, top, mouseX, mouseY) {
        this.style.opacity = "1";
        this.style.filter = "alpha(opacity=100)";

        this.column.insertBefore(this, dragGhost);

        this.style.position = "static";
        this.style.display = "block";
        //this.style.width = "auto";
        dragGhost.style.display = "none";
        Move(blogID);
    }
}


function Move(blogID) {
    var columns2 = [];
    var left = "";
    var right = "";
    sideBar = document.getElementById("sideBar");
    for (var i = 0; i < sideBar.childNodes.length; i++) {
        if (sideBar.childNodes[i].className == "column") {//筛选出所有的列 ff下的childNodes不可靠 :\
            columns2.push(sideBar.childNodes[i]);
        }
    }
    for (var i = 0; i < columns2.length; i++) {
        var column = columns2[i];
        for (var j = 0; j < column.childNodes.length; j++) {
            var item = column.childNodes[j];
            if (item.className == "sideModule") {
                item.column = column; //给每个拖拽对象要指明它属于哪一列 而且这个属性会随着拖动而更新的
                //alert(column.id+"|"+item.id);
                if (i == 0) {
                    left += item.id + ',';
                } else {
                    right += item.id + ',';
                }
            }
        }

    }
    var module = left;
    if (right != '') {
        module = left+ '|' + right;
    }
    jQuery.post('Ajax.aspx', "<?xml version='1.0' encoding='utf-8'?><root><type>move</type><module>" + module + "</module><blogID>" + blogID + "</blogID></root>", function(s) {
    var status = jQuery("status", s).text();
    if (status == "err") {
       alert(jQuery("body", s).text());
    }
    });
}

//function addwidget(widgetname, prosion) {
//    jQuery.post('WidSeting.aspx', "<?xml version='1.0' encoding='utf-8'?><root><type>ADD</type><widgetname>" + widgetname + "</widgetname><prosion>" + prosion + "</prosion></root>", function(s) {
//        var status = jQuery("status", s).text();
//        if (status == "err") {
//            alert(jQuery("body", s).text());
//        } else {
//            window.location.reload();
//        }
//    });
//}

function removeModule(module, evt, blogID) {
    var e = (evt) ? evt : window.event; 
    if (window.event) {
        e.cancelBubble = true;
    } else {
        e.stopPropagation();
    }
    if (!confirm('\u786E\u5B9A\u8981\u79FB\u9664\u8BE5\u5185\u5BB9\u6A21\u5757\u5417？')) { return false; }
    document.getElementById(module).style.display = 'none';
    jQuery.post('Ajax.aspx', "<?xml version='1.0' encoding='utf-8'?><root><type>removeModule</type><module>" + module + "</module><blogID>" + blogID + "</blogID></root>", function(s) {
        var status = jQuery("status", s).text();
        if (status == "err") {
            alert(jQuery("body", s).text());
        } 
    });
}

//function hideModule(evt) {
//    //jQuery.post('WidSeting.aspx', "<?xml version='1.0' encoding='utf-8'?><root><type>hideWidget</type><widgetid>" + widgetid + "</widgetid></root>", function(s) {
//        //var status = jQuery("status", s).text();
//        //if (status == "err") {
//            //alert(jQuery("body", s).text());
//        //} else {
////            var newobj = jQuery(obj).parent().parent();
////            jQuery(newobj).find("div[class='content']").hide();
////            jQuery(obj).parent().find("a[class='widget_show']").replaceWith("<a class=\"widget_show\" href=\"javascript:\" onMouseDown=\"javascript:showWidget(this,'" + widgetid + "',event);\" title=\"\u8FD8\u539F\">\u8FD8\u539F</a>");
////       // }
//    //});
//    //alert("dddd");
//    document.getElementById('sort').style.display = 'none';
// 
//    var e = (evt) ? evt : window.event;
// 
//    if (window.event) {
//        e.cancelBubble = true;

//    } else {
//        e.stopPropagation();
//    }
//    //donothing(evt);
//}

//function showWidget(obj, widgetid, evt) {
//    jQuery.post('WidSeting.aspx', "<?xml version='1.0' encoding='utf-8'?><root><type>showWidget</type><widgetid>" + widgetid + "</widgetid></root>", function(s) {
//        var status = jQuery("status", s).text();
//        if (status == "err") {
//            alert(jQuery("body", s).text());
//        } else {
//            var newobj = jQuery(obj).parent().parent();
//            jQuery(newobj).find("div[class='content']").show();
//            jQuery(obj).parent().find("a[class='widget_show']").replaceWith("<a class=\"widget_show\" href=\"javascript:\" onMouseDown=\"javascript:hideWidget(this,'" + widgetid + "',event);\" title=\"\u6700\u5C0F\u5316\">\u6700\u5C0F\u5316</a>");
//        }
//    });
//    var e = (evt) ? evt : window.event;
//    if (window.event) {
//        e.cancelBubble = true;
//    } else {
//        e.stopPropagation();
//    }
//}

//function editWidget(widgetid, evt) {
//    location.href = 'WidgetEdit.aspx?widgetid=' + widgetid;
//    var e = (evt) ? evt : window.event;
//    if (window.event) {
//        e.cancelBubble = true;
//    } else {
//        e.stopPropagation();
//    }
//}

function donothing(evt) {
    alert('s');
    var e = (evt) ? evt : window.event;
    alert('s');
    if (window.event) {
        e.cancelBubble = true;
        alert('s');
    } else {
        e.stopPropagation();
    }
}