var get = {
    byId: function(id) {
        return typeof id === "string" ? document.getElementById(id) : id
    },
    byClass: function(sClass, oParent) {
        var aClass = [];
        var reClass = new RegExp("(^| )" + sClass + "( |$)");
        var aElem = this.byTagName("*", oParent);
        for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
        return aClass
    },
    byTagName: function(elem, obj) {
        return (obj || document).getElementsByTagName(elem)
    }
};
var dragMinWidth = 800;
var dragMinHeight = 600;
/*-------------------------- +
 拖拽函数
 +-------------------------- */
function drag(oDrag, handle){
    var disX = 0;
    var disY = 0;
    var oMax = get.byClass("max", oDrag)[0];
    var oRevert = get.byClass("revert", oDrag)[0];
    var oClose = get.byClass("close", oDrag)[0];
    var allMap = document.getElementById("allmap");
    handle = handle || oDrag;
    handle.style.cursor = "move";
    handle.onmousedown = function (event){
        var event = event || window.event;
        disX = event.clientX - oDrag.offsetLeft;
        disY = event.clientY - oDrag.offsetTop;
        document.onmousemove = function (event){
            var event = event || window.event;
            var iL = event.clientX - disX;
            var iT = event.clientY - disY;

            var maxL = document.documentElement.clientWidth - oDrag.offsetWidth;
            var maxT = document.documentElement.clientHeight - oDrag.offsetHeight+document.body.scrollTop;
            iL <= 0 && (iL = 0);
            iT <= 0 && (iT = 0);
            iL >= maxL && (iL = maxL);
            iT >= maxT && (iT = maxT);
            oDrag.style.left = iL + "px";
            oDrag.style.top = iT + "px";
            return false
        };
        document.onmouseup = function (){
            document.onmousemove = null;
            document.onmouseup = null;
            this.releaseCapture && this.releaseCapture()
        };
        this.setCapture && this.setCapture();
        return false
    };
    //最大化按钮
    oMax.onclick = function (){
        oDrag.style.top = oDrag.style.left = 0;
        //整个窗体
        oDrag.style.width = document.documentElement.clientWidth - 2 + "px";
        oDrag.style.height = document.documentElement.clientHeight - 2 + "px";
        //地图大小
        allMap.style.width = document.documentElement.clientWidth - 15 + "px";
        allMap.style.height = document.documentElement.clientHeight - 100 + "px";
        this.style.display = "none";
        oRevert.style.display = "block";
    };
    //还原按钮
    oRevert.onclick = function (){
        oDrag.style.width = dragMinWidth + "px";
        oDrag.style.height = dragMinHeight + "px";
        oDrag.style.left = (document.documentElement.clientWidth - oDrag.offsetWidth) / 2 + "px";
        oDrag.style.top = (document.documentElement.clientHeight - oDrag.offsetHeight) / 2 + "px";
        //地图大小
        allMap.style.width = "790px";
        allMap.style.height = "500px";
        this.style.display = "none";
        oMax.style.display = "block";
    };
    //关闭按钮
    oClose.onclick = function (){
        map.clearOverlays();
        document.getElementById("lng").value = '';
        document.getElementById("lat").value = '';
        oDrag.style.display = "none";
    };
}
window.onload = window.onresize = function (){
    var oDrag = document.getElementById("drag");
    var oTitle = get.byClass("title", oDrag)[0];
    drag(oDrag, oTitle);
    oDrag.style.left = (document.documentElement.clientWidth - 800) / 2 + "px";
    oDrag.style.top = (document.documentElement.clientHeight - 600) / 2 + "px";
};