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lib/Alien/GvaScript/lib/GvaScript.js  view on Meta::CPAN

      }
      else
        node = this.parentNode(node);
    }

    // case 3: no next Node
    return null;
  },

  // find previous displayed node (i.e. skipping hidden nodes).
  previousDisplayedNode: function (node) {
    this._assertNodeOrLeaf(node, 'previousDisplayedNode: arg type');
    var node_init = node;

    while (node) {
      node = this.previousSibling(node);
      if (node && this.isVisible(node))
        return this.lastVisibleSubnode(node);
    }

    // if no previous sibling
    return this.parentNode(node_init);
  },

  enclosingNode:  function (elem) {
    return Element.navigateDom(
      $(elem), 'parentNode', this.classes.nodeOrLeaf,
      this.isRootElement.bind(this));
  },

  // flash the node
  flash: function (node) {
    var label = this.label(node);

    ASSERT(label, "node has no label");

    label.flash({duration: 200});
  },

  fireEvent: function(eventName, elem) {
    var args = [eventName];
    while (elem) {
      args.push(elem);
      elem = this.parentNode(elem);
    }
    args.push(this.rootElement);
    return GvaScript.fireEvent.apply(this, args);
  },

//-----------------------------------------------------
// Private methods
//-----------------------------------------------------
  // quick navigation initialization:
  // - exit navi_mode
  // - clear navi_word
  // - clear match result
  _clear_quick_navi: function() {
    if(this._quick_navi_mode !== false)
      window.clearTimeout(this._quick_navi_mode);

    this._quick_navi_mode  = false;  // quick_navi mode active (navi timer)
    this._quick_navi_word  = "";     // word to navigate to
    this.labels_array      = null;   // tree labels array
  },

  _assertNode: function(elem, msg) {
    ASSERT(elem && Element.hasAnyClass(elem, this.classes.node), msg);
  },

  _assertNodeOrLeaf: function(elem, msg) {
    ASSERT(elem && Element.hasAnyClass(elem, this.classes.nodeOrLeaf), msg);
  },

  _addHandlers: function() {
    Event.observe(
      this.rootElement,  "mouseover",
      this._treeMouseOverHandler.bindAsEventListener(this));

    Event.observe(
      this.rootElement,  "mouseout",
      this._treeMouseOutHandler.bindAsEventListener(this));

    Event.observe(
      // observing "mouseup" instead of "click", because "click"
      // on MSIE8 only fires when there is a tabindex
      this.rootElement,  "mouseup",
      this._treeClickHandler.bindAsEventListener(this));

    Event.observe(
      this.rootElement,  "dblclick",
      this._treeDblClickHandler.bindAsEventListener(this));
  },

  _removeHandlers: function() {
    this.rootElement.stopObserving();
    this.rootElement.unregister();
  },

//-----------------------------------------------------
// mouse handlers
//-----------------------------------------------------
  _treeClickHandler : function(event) {
    var target = Event.element(event);
    // IE: click on disabled input will fire the event
    // with event.srcElement null
    if(target.nodeType != 1) return;

    // ignore right mousedown
    if(!Event.isLeftClick(event)) return;

    // button clicked
    if(target.hasClassName(this.classes.button)) {
        // as not to fire blur_handler
        // on treeNode
        Event.stop(event);
        return this._buttonClicked(target.parentNode);
    }

    // label (or one of its childElements) clicked
    if(label = this.isLabel(target)) {
        return this._labelClicked(label.parentNode, event);

lib/Alien/GvaScript/lib/GvaScript.js  view on Meta::CPAN

      // not yet been selected
      if(node && !label.hasClassName(treeNavigator.classes.selected)) {
        treeNavigator.select  (node);
      }
    };

    // blur handler
    var blur_handler = function(e) {
      var label = e._target;
      label.removeAttribute('hasFocus');

      // deselect the previously selected node
      treeNavigator.select(null);
    };

    // focus and blur do not bubble
    // workaround per browser
    focus_handler = focus_handler.bindAsEventListener(this);
    blur_handler  = blur_handler.bindAsEventListener(this);

    this.rootElement.register('.'+this.classes.label, 'focus', focus_handler);
    this.rootElement.register('.'+this.classes.label, 'blur',  blur_handler );
  },


//-----------------------------------------------------
// timeout handler for firing Select/Deselect events
//-----------------------------------------------------

  _selectionTimeoutHandler: function(previousNode) {
      this._selectionTimeoutId = null;

      var newNode = this.selectedNode;

      // fire events
      if (previousNode != newNode) {
        if (previousNode) {
          this.fireEvent("Deselect", previousNode, this.rootElement);
        }
        if (newNode) {
          this.fireEvent("Select", newNode, this.rootElement);
        }
      }
  },


//-----------------------------------------------------
// Key handlers
//-----------------------------------------------------
  _charHandler: function (event) {
    var selectedNode = this.selectedNode;
    if(! selectedNode) return;

    // stop firefox quick search if enabled
    // via "accessibility.typeaheadfind" => 'true'
    Event.stop(event);

    this._quick_navi_word += event.keyName; // always uppercase
    var is_quick_navi_mode = (this._quick_navi_mode !== false);

    // drop the previous timer
    if(is_quick_navi_mode) {
      window.clearTimeout(this._quick_navi_mode);
    }
    // initialize labels_array on start of quick-search
    // (mandate of dynamic trees)
    else {
        this.labels_array = this.rootElement.select('.'+this.classes.label);
    }

    // activate a new timer
    this._quick_navi_mode = window.setTimeout(function() {
      this._clear_quick_navi();
    }.bind(this), 800);

    var selectedLabel = this.label(selectedNode);
    var selectedIndex = this.labels_array.indexOf(selectedLabel);
    // partitions the labels array into 2 arrays
    // 1: preceeding labels & selectedNode if not in quick_navi_mode
    // 2: following labels  & selectedNode if in quick_navi_mode
    var labels = this.labels_array.partition(function(l, index) {
        // quick-navi mode
        if(is_quick_navi_mode) return index < selectedIndex;
        else                   return index <= selectedIndex;
    });

    // returns first label found to start with word.
    var find_match = function(labels, word) {
        var match = labels.find(function(label) {
            return label.innerHTML.stripTags()          // in case label contains HTML elements
                    .replace(/\r?\n/g, '')              // clear line breaks
                    .replace(/\ \ /g, '')               // clear white-spaces
                    .toUpperCase().startsWith(word);
        });
        return match;
    }

    // first look ahead then look back
    var matching_label  =  find_match(labels[1], this._quick_navi_word)
                        || find_match(labels[0], this._quick_navi_word);

    // found a match -> make it visible and select it
    if(matching_label) {
      this.openEnclosingNodes(matching_label);

      var znode = this.enclosingNode(matching_label);
      this.scrollTo(znode);
      this.select  (znode);
    }
    // no match -> flash the selected label
    else {
      this.label(this.selectedNode).flash();
    }
  },

  _downHandler: function (event) {
    var selectedNode = this.selectedNode;
    if (selectedNode) {
      var nextNode = this.nextDisplayedNode(selectedNode);
      if (nextNode) {
        this.scrollTo(nextNode);
        this.select  (nextNode);
      }
      else this.flash(selectedNode);

      Event.stop(event);
    }
    // otherwise: do nothing and let default behaviour happen
  },

  _upHandler: function (event) {