slidy.js

大学的算法分析与设计

      var contents = document.createElement("a");
      contents.setAttribute("href", "javascript:toggleTableOfContents()");//xuan
      contents.setAttribute("title", "目录列表".localize());
      contents.innerHTML = " 目录 ".localize();
      toolbar.appendChild(contents);
	  
	  var smaller = document.createElement("a");
      smaller.setAttribute("href", "javascript:smaller()");//xuan addsmaller
      smaller.setAttribute("title", "字体变小".localize());
      smaller.innerHTML = " 缩小 ".localize();
      toolbar.appendChild(smaller);
	  
	  var bigger = document.createElement("a");
      bigger.setAttribute("href", "javascript:bigger()");//xuan addbigger
      bigger.setAttribute("title", "字体变大".localize());
      bigger.innerHTML = " 放大 ".localize();
      toolbar.appendChild(bigger);
	  
      var copyright = findCopyright();
	  var help = document.createElement("a");
      help.setAttribute("href", helpPage);
      //help.setAttribute("title", helpText.localize());
      help.innerHTML = " 帮助 ".localize();
      toolbar.appendChild(help);      
	  
	  var return00 = document.createElement("a");
     return00.setAttribute("href", "arithmetic.html");
      //help.setAttribute("title", helpText.localize());
      return00.innerHTML = " 返回".localize();
      toolbar.appendChild(return00); 
	  helpAnchor = return00;     

      if (copyright)
      {
       var span = document.createElement("div");
	   span.setAttribute("class", "toolbar");
         span.innerHTML = copyright;
         //copyright0.style.color = "blue";
		 //span.innerHTML = "<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"+copyright+"";
         span.style.fontSize = "70%";
		 span.style.fontFamily="Times New Roman";
        span.style.position = "absolute";
		 //span.style.marginLeft = "26em";
		//span.style.right= "0";
		span.style.height = "1.2em";
        span.style.top = "auto";
         span.style.right = "0";
		 span.style.fontWeight="bold";
		  span.style.width = "auto"; 
		 span.style.textAlign = "right";
		 span.style.color = "#C4AE2D";
		 //copyright0.style.background = "rgb(0,72,178)";
         toolbar.appendChild(span);
      }
	  
      slideCounter = document.createElement("div")
      slideCounter.style.position = "absolute";
      slideCounter.style.width = "auto"; //"20%";
      slideCounter.style.height = "1.2em";
      slideCounter.style.top = "auto";
      slideCounter.style.bottom = 0;
      slideCounter.style.right = "0";
      slideCounter.style.textAlign = "right";
      slideCounter.style.color = "white";
      slideCounter.style.background = "rgb(28,72,120)";

     
	 
      toolbar.appendChild(slideCounter);
   }

   // ensure that click isn't passed through to the page
   toolbar.onclick = stopPropagation;
   document.body.appendChild(toolbar);
   slideNumElement = slideCounter;
   setEosStatus(false);

   return toolbar;
}

function isShownToc()
{
  if (toc && toc.style.visible == "visible")
    return true;

  return false;
}

function showTableOfContents()//xuan
{
  if (toc)
  {
    if (toc.style.visible != "visible")
    {
      toc.style.visible = "visible";
      toc.style.display = "block";
      toc.focus();

      if (ie7 && slidenum == 0)
        setTimeout("ieHack()", 100);
    }
    else
      hideTableOfContents();
  }
}

function hideTableOfContents()//xuan
{
  if (toc && toc.style.visible != "hidden")
  {
    toc.style.visible = "hidden";
    toc.style.display = "none";

    try
    {
       if (!opera)
         helpAnchor.focus();
    }
    catch (e)
    {
    }
  }
}

function toggleTableOfContents()//xuan
{
  if (toc)
  {
     if (toc.style.visible != "visible")
       showTableOfContents();//xuan
     else
       hideTableOfContents();
  }
}

// called on clicking toc entry
function gotoEntry(e)
{
   var target;

   if (!e)
      var e = window.event;

   if (e.target)
      target = e.target;
   else if (e.srcElement)
      target = e.srcElement;

   // work around Safari bug
   if (target.nodeType == 3)
      target = target.parentNode;

   if (target && target.nodeType == 1)
   {
     var uri = target.getAttribute("href");

     if (uri)
     {
        //alert("going to " + uri);
        var slide = slides[slidenum];
        hideSlide(slide);
        slidenum = findSlideNumber(uri);
        slide = slides[slidenum];
        lastShown = null;
        setLocation();
        setVisibilityAllIncremental("hidden");
        setEosStatus(!nextIncrementalItem(lastShown));
        showSlide(slide);
        //target.focus();

        try
        {
           if (!opera)
             helpAnchor.focus();
        }
        catch (e)
        {
        }
     }
   }

   hideTableOfContents(e);
   if (ie7) ieHack();
   stopPropagation(e);
   return cancel(e);
}

// called onkeydown for toc entry
function gotoTocEntry(event)
{
  var key;

  if (!event)
    var event = window.event;

  // kludge around NS/IE differences 
  if (window.event)
    key = window.event.keyCode;
  else if (event.which)
    key = event.which;
  else
    return true; // Yikes! unknown browser

  // ignore event if key value is zero
  // as for alt on Opera and Konqueror
  if (!key)
     return true;

  // check for concurrent control/command/alt key
  // but are these only present on mouse events?

  if (event.ctrlKey || event.altKey)
     return true;

  if (key == 13)
  {
    var uri = this.getAttribute("href");

    if (uri)
    {
      //alert("going to " + uri);
      var slide = slides[slidenum];
      hideSlide(slide);
      slidenum = findSlideNumber(uri);
      slide = slides[slidenum];
      lastShown = null;
      setLocation();
      setVisibilityAllIncremental("hidden");
      setEosStatus(!nextIncrementalItem(lastShown));
      showSlide(slide);
      //target.focus();

      try
      {
         if (!opera)
           helpAnchor.focus();
      }
      catch (e)
      {
      }
    }

    hideTableOfContents();
    if (ie7) ieHack();
    return cancel(event);
  }

  if (key == 40 && this.next)
  {
    this.next.focus();
    return cancel(event);
  }

  if (key == 38 && this.previous)
  {
    this.previous.focus();
    return cancel(event);
  }

  return true;
}

function isTitleSlide(slide)
{
   return hasClass(slide, "title");
}

// create div element with links to each slide  xuan
function tableOfContents()//xuan
{
  var toc = document.createElement("div");
  addClass(toc, "toc");
  //toc.setAttribute("tabindex", "0");

  var heading = document.createElement("div");
  addClass(heading, "toc-heading");
  heading.innerHTML = "目录".localize();

  heading.style.textAlign = "center";
  heading.style.width = "80%";
  heading.style.margin = "0";
  heading.style.marginBottom = "1em";
  heading.style.borderBottomStyle = "solid";
  heading.style.borderBottomColor = "rgb(180,180,180)";
  heading.style.borderBottomWidth = "1px";
   heading.style.color = "white";

  toc.appendChild(heading);
  var previous = null;

  for (var i = 0; i < slides.length; ++i)
  {
    var title = hasClass(slides[i], "title");
    //var num = document.createTextNode((i + 1) + ". ");

  
	//toc.appendChild(num);

    var a = document.createElement("a");
    a.setAttribute("href", "#(" + (i+1) + ")");

    if (title)
      addClass(a, "titleslide");

    var name = document.createTextNode((i + 1) + ". "+slideName(i));
    a.appendChild(name);
    a.onclick = gotoEntry;
    a.onkeydown = gotoTocEntry;
    a.previous = previous;

    if (previous)
      previous.next = a;

    toc.appendChild(a);

    if (i == 0)
      toc.first = a;

    if (i < slides.length - 1)
    {
      var br = document.createElement("br");
      toc.appendChild(br);
    }

    previous = a;
  }

  toc.focus = function () {
    if (this.first)
      this.first.focus();
  }

  toc.onclick = function (e) {
    e||(e=window.event);
    hideTableOfContents();
    stopPropagation(e);
    
    if (e.cancel != undefined)
      e.cancel = true;
      
    if (e.returnValue != undefined)
      e.returnValue = false;
      
    return false;
  };

  toc.style.position = "absolute";
  toc.style.zIndex = "300";
  toc.style.width = "40%";
  toc.style.maxWidth = "30em";
  toc.style.height = "30em";
  toc.style.overflow = "auto";
  toc.style.top = "auto";
  toc.style.right = "auto";
  toc.style.left = "4em";
  toc.style.bottom = "4em";
  toc.style.padding = "1em";
  toc.style.background = "#2C2C2C";
  toc.style.borderStyle = "solid";
  toc.style.borderWidth = "2px";
  toc.style.fontSize = "60%";

  document.body.insertBefore(toc, document.body.firstChild);
  return toc;
}

function replaceByNonBreakingSpace(str)
{
   for (var i = 0; i < str.length; ++i)
      str[i] = 160;
}


function initOutliner()
{
  var items = document.getElementsByTagName("LI");

  for (var i = 0; i < items.length; ++i)
  {
     var target = items[i];

     if (!hasClass(target.parentNode, "outline"))
        continue;

     target.onclick = outlineClick;

     if (!ns_pos)
     {
        target.onmouseover = hoverOutline;
        target.onmouseout = unhoverOutline;
     }

     if (foldable(target))
     {
       target.foldable = true;
       target.onfocus = function () {outline = this;};
       target.onblur = function () {outline = null;};

       if (!target.getAttribute("tabindex"))
         target.setAttribute("tabindex", "0");

       if (hasClass(target, "expand"))
         unfold(target);
       else
         fold(target);
     }
     else
     {
       addClass(target, "nofold");
       target.visible = true;
       target.foldable = false;
     }
  }
}

function foldable(item)
{
   if (!item || item.nodeType != 1)
      return false;

   var node = item.firstChild;

   while (node)
   {
     if (node.nodeType == 1 && isBlock(node))
       return true;

      node = node.nextSibling;
   }

   return false;
}

function fold(item)
{
  if (item)
  {
    removeClass(item, "unfolded");
    addClass(item, "folded");
  }

  var node = item ? item.firstChild : null;

  while (node)
  {
    if (node.nodeType == 1 && isBlock(node)) // element
    {
      // note that getElementStyle won't work for Safari 1.3
      node.display = getElementStyle(node, "display", "display");
      node.style.display = "none";
      node.style.visibility = "hidden";
    }

    node = node.nextSibling;
  }

  item.visible = false;
}

function unfold(item)
{
   if (item)
   {
     addClass(item, "unfolded");
     removeClass(item, "folded");
   }

  var node = item ? item.firstChild : null;

  while (node)
  {
    if (node.nodeType == 1 && isBlock(node)) // element
    {
      // with fallback for Safari, see above
      node.style.display = (node.display ? node.display : "block");
      node.style.visibility = "visible";
    }

    node = node.nextSibling;
  }

  item.visible = true;
}

function outlineClick(e)
{
   var rightclick = false;
   var target;

   if (!e)
      var e = window.event;

   if (e.target)
      target = e.target;
   else if (e.srcElement)
      target = e.srcElement;

   // work around Safari bug
   if (target.nodeType == 3)
      target = target.parentNode;

   while (target && target.visible == undefined)
      target = target.parentNode;

   if (!target)
      return true;

   if (e.which)
      rightclick = (e.which == 3);
   else if (e.button)
      rightclick = (e.button == 2);

   if (!rightclick && target.visible != undefined)
   {
      if (target.foldable)
      {
         if (target.visible)
           fold(target);
         else
           unfold(target);
      }

      stopPropagation(e);
      e.cancel =