source: branches/gdl-frontend/src/ajax/javascripts/home.js

//+-----------------------------------------------------------------------------
//+  Isidorus
//+  (c) 2008-2010 Marc Kuester, Christoph Ludwig, Lukas Georgieff
//+
//+  Isidorus is freely distributable under the LLGPL license.
//+  This ajax module uses the frameworks PrototypeJs and Scriptaculous, both
//+  are distributed under the MIT license.
//+  You can find a detailed description in trunk/docs/LLGPL-LICENSE.txt, and
//+  trunk/docs/LGPL-LICENSE.txt in
//+  trunk/src/ajax/javascripts/external/MIT-LICENSE.txt.
//+-----------------------------------------------------------------------------

function makeHome()
{
    var content = new Element("div", {"class" : CLASSES.content()});
    var header = new Element("h1").update("Topic Maps Overview");
    content.insert({"bottom" : header});
    $(CLASSES.subPage()).insert({"bottom" : content});

    function successFun(xhr){
        var json = null;
        try{
            json = xhr.responseText.evalJSON();
        }
        catch(innrErr){}

        try{
            if(json === null) {
                alert("The server's response does not contain any topics!");
            }
            else {
                var treeView = new TreeViewC(json);
                content.insert({"bottom" : treeView.getFrame()});
            }
        }
        catch(err) {
            alert("Could not create a Topic Map overview: " + err);
        }
    }

    requestTreeView(successFun, null);
}


// --- Represents a list of trees.
var TreeViewC = Class.create({"initialize" : function(contents){
                                  if(!contents) throw "From NodeC(): content must be set!";
                                  try {
                                      this.__frame__ = new Element("ul", {"class" : CLASSES.treeView()});
                                      for(var i = 0; i !== contents.length; ++i){
                                          var tLi = new Element("li").update(new TreeC(contents[i]).getFrame());
                                          this.__frame__.insert({"bottom" : tLi});
                                      }
                                  }
                                  catch(err){
                                      throw "From TreeC(): The following exception was thrown:\n" + err;
                                  }
                              },
                              "getFrame" : function(){
                                  return this.__frame__;
                              }});


// --- Represents the root of a tree of nodes and contain all tree's nodes.
var TreeC = Class.create({"initialize" : function(content){
                              if(!content) throw "From NodeC(): content must be set!";
                              try {
                                  this.__frame__ = new Element("ul", {"class" : CLASSES.tree()});
                                  this.__frame__.update(new NodeC(content).getFrame());
                              }
                              catch(err){
                                  throw "From TreeC(): The following exception was thrown:\n" + err;
                              }
                          },
                          "getFrame" : function(){
                              return this.__frame__;
                          }});


// --- Represents a tree node with a topic as a list of psis,
// --- an edit and a create button. Furter the node can contain
// --- more nodes as listings of instances and subtypes of the
// --- current node's topic.
var NodeC = Class.create({"initialize" : function(content){
                              if(!content) throw "From NodeC(): content must be set!";
                              try {
                                  this.__frame__ = new Element("li", {"class" : CLASSES.node()});
                                  this.__isMinimized__ = false;

                                  function setClickHandler(myself){
                                      myself.__frame__.observe("click", function(event){
                                          if(myself.__isMinimized__ === false){
                                              if(myself.__instances__) myself.__instances__.hide();
                                              if(myself.__subtypes__) myself.__subtypes__.hide();
                                              myself.__frame__.setStyle({"color" : "#ff7f00"});
                                              myself.__isMinimized__ = true;
                                          }
                                          else {
                                              if(myself.__instances__) myself.__instances__.show();
                                              if(myself.__subtypes__) myself.__subtypes__.show();
                                              myself.__frame__.setStyle({"color" : "inherit"});
                                              myself.__isMinimized__ = false;
                                          }
                                          Event.stop(event);
                                      });
                                  }
                                  setClickHandler(this);
                                  
                                  if((content.instances && content.instances.length !== 0) || (content.subtypes && content.subtypes.length !== 0)) {
                                      this.getFrame().setStyle({"cursor" : "pointer"});
                                  }
                                  else {
                                      this.getFrame().setStyle({"cursor" : "text"});
                                  }

                                  this.__topic__ = new Element("ul", {"class" : CLASSES.topicPsis()});
                                  this.__frame__.insert({"bottom" : this.__topic__});
                                  for(var i = 0; content.topic && i !== content.topic.length; ++i){
                                      var tLi = new Element("li").update(content.topic[i]);
                                      this.__topic__.insert({"bottom" : tLi});
                                  }
                                  
                                  this.__edit__ = new Element("span", {"class" : CLASSES.clickable()}).update("edit");
                                  this.__create__ = new Element("span", {"class" : CLASSES.clickable()}).update("create");
                                  if(content.isType !== true){
                                      this.__create__.writeAttribute({"class" : CLASSES.disabled()});
                                  }
                                  else {
                                      this.__create__.observe("click", function(event){
                                          setNaviClasses($(PAGES.create));
                                          makePage(PAGES.create, content.topic[0]);
                                          Event.stop(event);
                                      });
                                  }

                                  if(content.isInstance !== true){
                                      this.__edit__.writeAttribute({"class" : CLASSES.disabled()});
                                  }
                                  else {
                                      this.__edit__.observe("click", function(event){
                                          setNaviClasses($(PAGES.edit));
                                          makePage(PAGES.edit, content.topic[0]);
                                          Event.stop(event);
                                      });
                                  }
                                  this.__frame__.insert({"bottom" : this.__edit__});
                                  this.__frame__.insert({"bottom" : "<span>|</span>"});
                                  this.__frame__.insert({"bottom" : this.__create__});
                                  for(var i = 1; content.topic && i < content.topic.length; ++i) this.__frame__.insert({"bottom" : "<br/><span>&nbsp;</span>"});

                                  this.__instances__ = null;
                                  this.__subtypes__ = null;

                                  if(content.instances && content.instances.length !== 0) {
                                      this.__instances__ = new Element("ul", {"class" : CLASSES.instances()});
                                      for(var i = 0; i !== content.instances.length; ++i){
                                          var entry = new NodeC(content.instances[i]);
                                          this.__instances__.insert({"bottom" : entry.getFrame()});
                                      }
                                  }

                                  if(content.subtypes && content.subtypes.length !== 0) {
                                      this.__subtypes__ = new Element("ul", {"class" : CLASSES.subtypes()});
                                      for(var i = 0; i !== content.subtypes.length; ++i){
                                          var entry = new NodeC(content.subtypes[i]);
                                          this.__subtypes__.insert({"bottom" : entry.getFrame()});
                                      }
                                  }

                                  if(this.__instances__) this.__frame__.insert({"bottom" : this.__instances__});
                                  if(this.__subtypes__) this.__frame__.insert({"bottom" : this.__subtypes__});
                              }
                              catch(err){
                                 throw "From NodeC(): The following exception was thrown:\n" + err;
                             }
                          },
                          "getFrame" : function(){
                              return this.__frame__;
                          }});