PC World 2008 September/PCWorld_2008-09_cd.bin/v cisle/sadanastroju/bookmark_previews-0.6.5-fx.xpi/chrome/content/tooltip.js

Text File | 2008-05-27 | 6KB | 176 lines

var BP = {
  _titleNode : null,
  _previewNode : null,
  get titleNode(){
    if (!this._titleNode)
      this._titleNode = document.getElementById("bptp_title");
    return this._titleNode;
  },
  get previewNode(){
    if (!this._previewNode)
      this._previewNode = document.getElementById("bptp_image");
    return this._previewNode;
  },
  _prefs : null,
  get prefs(){
    if (!this._prefs){
      this._prefs = Components.classes["@mozilla.org/preferences-service;1"].
                    getService(Components.interfaces.nsIPrefService);
      this._prefs = this._prefs.getBranch("extensions.bookmarkpreviews.");
    }
    return this._prefs;
  },
  _isFF3: null,
  get isFF3(){
    if (this._isFF3 == null){
      var appInfo = Components.classes["@mozilla.org/xre/app-info;1"]
                              .getService(Components.interfaces.nsIXULAppInfo);
      var versionChecker = Components.classes["@mozilla.org/xpcom/version-comparator;1"]
                                     .getService(Components.interfaces.nsIVersionComparator);
      if(versionChecker.compare(appInfo.version, "3.0a") >= 0) {
        this._isFF3 = true;
      } else{
        this._isFF3 = false;
      }
    }
    return this._isFF3;
  },
  _tree: null,
  get tree(){
    if (!this._tree){
      this._tree = document.getElementById("bookmarks-view");
    }
    return this._tree;
  },
  get children(){
    if (this.isFF3){
      return document.getElementById("bookmarks-view-children");
    } else {
      return this.tree.tree.getElementsByTagName("treechildren");
    }
  },
  load: function bp_load(event){
    BP.prefs.QueryInterface(Components.interfaces.nsIPrefBranch2).addObserver("",BP,false);
    var show = BP.prefs.getBoolPref("sidebarTooltips");
    if (!show){
      BP.disableTooltip();
    } else{
      BP.enableTooltip();
    }
  },
  unload: function bp_unload(event){
    BP.prefs.removeObserver("",BP,false);
    BP.disableTooltip();
  },
  handleEvent: function bp_handleevent(event){
    if (event.type == "mousemove"){
      BP.x = event.clientX;
      BP.y = event.clientY;
    }
  },
  observe: function bp_observe(subject, topic, data){
    if (topic != "nsPref:changed"){
      return;
    }
    if (data == "sidebarTooltips"){
      var show = this.prefs.getBoolPref("sidebarTooltips");
      if (show){
        this.enableTooltip();
      } else{
        this.disableTooltip();
      }
    }
  },
  disableTooltip: function bp_disabletooltip(){
    if (this.isFF3)
      this.children.removeAttribute("tooltip");
    else {
      var eles = this.children;
      for (var i = 0; i<eles.length;i++){
        eles[i].removeAttribute("tooltip");
      }
    }
    try{
      this.tree.removeEventListener("mousemove",this,false);
    }catch(e){}
  },
  enableTooltip: function bp_enabletooltip(){
    this.tree.addEventListener("mousemove",this.handleEvent,false);
    if (this.isFF3)
      this.children.setAttribute("tooltip","bookmarkpreviewsTooltip");
    else {
      var eles = this.children;
      for (var i = 0; i<eles.length;i++){
        eles[i].setAttribute("tooltip","bookmarkpreviewsTooltip");
      }
    }
  },
  tooltipShowing: function bp_tooltipshowing(event){
    this.previewNode.src = null;
    this.previewNode.removeAttribute("style");
    this.previewNode.collapsed = true;
    return true;
  },
  tooltipShown: function bp_tooltipshown(event){
    var tooltip = event.target;
    var x = BP.x; var y = BP.y;
    var row = this.tree.treeBoxObject.getRowAt(x,y);
    var title = {}, url = {};
    this.getProperties(row,title,url);
    this.titleNode.setAttribute("value",title.value);

    var src = this.getImage(url.value);
    if (src){
      var image = new Image();
      image.onload = function(event){
        var target = BP.previewNode;
        var maxwidth = 300;
        var width = image.width;
        var height = image.height;
        if (width>maxwidth){
          height = maxwidth / width * height;
          target.setAttribute("style","max-width: "+maxwidth+"px; max-height: "+height+"px");
          target.src = src;
        }
      };
      image.src = src;
      if (image.complete) image.onload();
      this.previewNode.collapsed = false;
    } else{
      this.previewNode.collapsed = true;
    }
  },
  getImage: function bp_getimage(url){
    if (url){
      var file = PreviewServiceUtils.getPreviewFile(url);
      if (file.exists() && file.isFile()){
        var ios = Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
        var uri = ios.newFileURI(file);
        if (uri)
          return uri.spec;
      }
    }
    return null;
  },
  getProperties: function bp_getproperties(index, title, url){
    if (index > -1){
      if (this.isFF3){
        var node = this.tree.view.nodeForTreeIndex(index);
        title.value = node.title;
        url.value = node.uri;
      } else {
        var node = this.tree.getRowResource(index);
        var nameProp = RDF.GetResource("http://home.netscape.com/NC-rdf#Name");
        var urlProp  = RDF.GetResource("http://home.netscape.com/NC-rdf#URL")
        var itemValue = BMDS.GetTarget(node, nameProp, true);
        if (itemValue && itemValue instanceof Components.interfaces.nsIRDFLiteral)
          title.value = itemValue.Value;
        var itemValue = BMDS.GetTarget(node, urlProp, true);
        if (itemValue && (itemValue instanceof Components.interfaces.nsIRDFLiteral || itemValue.Value))
          url.value = itemValue.Value;
      }
    }
  }
}
addEventListener("load",BP.load,false);
addEventListener("unload",BP.unload,false);