/**
 * 得到ID为id的DOM对象
 * 
 * @param id
 * @return DOM object
 */
function obj(id)
{
	return document.getElementById(id);
}
/**
 * 得到name为name的DOM对象数组
 * 
 * @param name
 * @return DOM objects
 */
function objs(name) {
	return document.getElementsByTagName(name);
}
function getOffset(evt) {
	var target = evt.target;
	if (target.offsetLeft == undefined) {
		target = target.parentNode;
	}
	var pageCoord = getPageCoord(target);
	var eventCoord = {
		x :window.pageXOffset + evt.clientX,
		y :window.pageYOffset + evt.clientY
	};
	var offset = {
		offsetX :eventCoord.x - pageCoord.x,
		offsetY :eventCoord.y - pageCoord.y
	};
	return offset;
}
function getPageCoord(element) {
	var coord = {
		x :0,
		y :0
	};
	while (element) {
		coord.x += element.offsetLeft;
		coord.y += element.offsetTop;
		element = element.offsetParent;
	}
	return coord;
}
function imageAuto(nID, nMaxWidth, nMaxHeight) {
	var objParentID = obj(nID);
	var objImg = objParentID.getElementsByTagName("img");
	for (i = 0; i < objImg.length; i++) {
		img_resize(objImg[i], nMaxWidth, nMaxHeight);
	}
}
function img_resize(imgObj, maxWidth, maxHeight) {
	var w_h = imgObj.width / imgObj.height;
	var h_w = imgObj.height / imgObj.width;
	
	if(w_h<h_w)
	{
		if(imgObj.height>maxHeight) imgObj.height = maxHeight;
	}
	else
	{
		if(imgObj.width>maxWidth) imgObj.width = maxWidth;
	}
	
/*	var nImgNewRate = 0;
	var nImgOldRate = maxWidth / maxHeight;
	nImgNewRate = imgObj.offsetWidth / imgObj.offsetHeight;
	if (nImgNewRate >= nImgOldRate) {
		imgObj.style.height = maxWidth / nImgNewRate + "px";
		imgObj.style.width = maxWidth + "px";
		imgObj.style.marginTop = Math.round((maxHeight - maxWidth/ nImgNewRate)/2)+"px";
	} else {
		imgObj.style.width = maxHeight * nImgNewRate + "px";
		imgObj.style.height = maxHeight + "px";
		imgObj.style.marginLeft = Math.round((maxWidth - maxHeight * nImgNewRate))/2+"px";
	}*/
}
function img_reload(img)
{
	var r = Math.random();
	var img_o = obj(img);
	img_o.src = img_o.src+'?'+r;
}
swoole = function(){};
swoole.prototype.version = '1.01';

// 获得事件Event对象，用于兼容IE和FireFox
swoole.getEvent = function(event){
	return window.event || arguments.callee.caller.arguments[0];
};
swoole.Dialog = function(title, msg, w, h , modal , buttons){
	if (typeof(modal)=='undefined') var modal=true;
	var iWidth = document.documentElement.clientWidth;
	var iHeight = document.documentElement.clientHeight+screen.height;

	var bodyObj = document.createElement("div");
	var dialogObj=document.createElement("div");
	
	this.show = function()
	{
		if(modal) document.body.appendChild(bodyObj);
		document.body.appendChild(dialogObj);
	};
	
	this.close = function()
	{
		if(modal) document.body.removeChild(bodyObj);
		document.body.removeChild(dialogObj);
	};
	
	if(modal)
	{
		bodyObj.className = 'Dialog_bodybg';
		bodyObj.style.cssText = "width:"+iWidth+"px;height:"+(document.body.scrollHeight)+"px;";
	}
	dialogObj.className = 'Dialog';
	dialogObj.style.cssText = "top:"+(document.documentElement.scrollTop+(document.documentElement.clientHeight/2-h/2))+"px;left:"+(iWidth-w)/2+"px;width:"+w+"px;height:auto;";
	
	var headBar = document.createElement("div");
	var bodyBar = document.createElement("div");
	var footBar = document.createElement("div");

	headBar.className = 'Dialog_head';
	headBar.style.paddingLeft = "10px";
	
	var moveX = 0;
	var moveY = 0;
	var moveTop = 0;
	var moveLeft = 0;
	var moveable = false;
	var docMouseMoveEvent = document.onmousemove;
	var docMouseUpEvent = document.onmouseup;
	headBar.onmousedown = function(){
		var evt = swoole.getEvent();
		moveable = true; 
		moveX = evt.clientX;
		moveY = evt.clientY;
		moveTop = parseInt(dialogObj.style.top);
		moveLeft = parseInt(dialogObj.style.left);
		document.onmousemove = function(){
	if (moveable){
		var evt = swoole.getEvent();
		var x = moveLeft + evt.clientX - moveX;
		var y = moveTop + evt.clientY - moveY;
		if ( x > 0 &&( x + w < iWidth) && y > 0 && (y + h < iHeight)){
			dialogObj.style.left = x + "px";
			dialogObj.style.top = y + "px";
		}
	}
	};

	document.onmouseup = function (){
		if (moveable) {
			document.onmousemove = docMouseMoveEvent;
			document.onmouseup = docMouseUpEvent;
			moveable = false;
			moveX = 0;
			moveY = 0;
			moveTop = 0;
			moveLeft = 0;
		}
	};
	}
	var titleDiv = document.createElement('div');
	titleDiv.className = 'Dialog_title';
	titleDiv.innerHTML = title;
	headBar.appendChild(titleDiv);
	
	var closeBtn = document.createElement('div');	
	closeBtn.className = "Dialog_close";
	closeBtn.innerHTML = "<span>关闭</span>";
	closeBtn.onclick = this.close;
	headBar.appendChild(closeBtn);
	
	bodyBar.className = 'Dialog_msg';
	bodyBar.innerHTML = msg;
	
	footBar.className = 'Dialog_bottom';
	if(typeof(buttons)=='object'){
		for(i=0;i<buttons.length;i++){
			btn = buttons[i];
			btn.addTo(footBar);
		}
	}
	else if(typeof(buttons)=='string'){
		footBar.innerHTML = buttons;
	}
	else{
		var btn = new swoole.Button('确定');		
		btn.addTo(footBar);
		btn.click(this.close);
	}
	dialogObj.appendChild(headBar);
	dialogObj.appendChild(bodyBar);
	dialogObj.appendChild(footBar);
};
swoole.Dialog.prototype.type = 'Dialog';
swoole.alert = function(msg){
	var alert_dialog = new swoole.Dialog('提示',msg,320,320);
	alert_dialog.show();
};
swoole.confirm = function(msg,yes,no)
{
	var btns = [new swoole.Button('是',yes),new swoole.Button('否',no)];
	var confirm_dialog = new swoole.Dialog('请选择',msg,320,320,true,btns);
	confirm_dialog.show();
};

swoole.Button = function(text,callback)
{
	this.m_button = document.createElement('input');
	this.m_button.type='button';
	this.m_button.className='swoole_button';
	this.m_button.value=text;
	if(callback) this.m_button.onclick = callback;
	this.addTo = function(obj){obj.appendChild(this.m_button);};
	this.click = function(call){this.m_button.onclick=call};
};
swoole.Button.prototype.type='Button';