var DDSPEED = 10;
var DDTIMER = 15;

// 处理鼠标动作的主函数 //
function ddMenu(id,d){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
    if(c.maxh && c.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.display = 'block';
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
    }
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
}

// 回缩菜单 //
function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}

// 如果有用户将鼠标放置在菜单上则取消回溯 //
function cancelHide(id){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}

// 展开/回缩菜单，并设置透明度 //
function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
  }else{
    dist = (Math.round(currh / DDSPEED));
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = currh / c.maxh;
  c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}



// 右边栏自适应
function handleFrameLoad() {
var hDoc = getBodyHeight(document);
var tblmain = document.getElementById('tblMain');
var mFrame = window.mainFrame;
var hFrameDoc = getFrameHeight(mFrame);
var hTable = hDoc-80; //减去该页面除iframe外其他控件所占的高度.
if(hFrameDoc > hTable) hTable = hFrameDoc;
tblmain.style.height = hTable;
mFrame.height = hTable;
if(window.mainFrame.moduleRight != null){
//表示该内嵌页，包含内嵌的页面，页iframe的id固定为moduleRight。
initFrameHeight(mFrame,hTable);
}
}

/**
* 获取当前页面的高度
*/
function getBodyHeight(doc){
if(doc.all) return doc.body.offsetHeight;
else return doc.body.scrollHeight;
}

/**
* 获取内嵌页中的高度.
* 若另含子内嵌(moduleRight)页时,应考虑该页面的高度.
*/
function getFrameHeight(mFrame){
var h1 = mFrame.document.body.offsetHeight;
var h2 = mFrame.document.body.scrollHeight;
if(mFrame.moduleRight != null){
var h3 = mFrame.moduleRight.document.body.scrollHeight;
if(h3 > h2) h2 = h3;
}
return h2;
}

/**
* 设置子内嵌页面的高度.
* 通过设置iframe所在table的高度来调整。
*/
function initFrameHeight(frame,hFrame){
var tbl = frame.document.getElementById('tblMainFrame');
tbl.style.height = hFrame;
}