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/*****************************************************************************
*
* Element.js - Base class for all elements
*
* Copyright (c) 2004-2016 NagVis Project (Contact: info@nagvis.org)
*
* License:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/
var Element = Base.extend({
// Holds the NagVis object which this element is associated with
obj : null,
// Holds the root dom object of this element
dom_obj : null,
constructor: function(obj) {
this.obj = obj;
},
// Is called once when the object is being initialized and
// on every time the config has changed. It's task is to
// initialize this element and all eventual sub elements
update: function() {},
// Is called on every state/config update. For the most objects
// this re-renders the element on each non state update.
updateAttrs: function(only_state, is_locked) {
if (!only_state) {
this.erase();
this.render();
if (!is_locked)
this.unlock();
this.draw();
}
},
// Is called to draw this elements DOM nodes this is called
// once during initializaton and whenever the parent element
// is redrawn, for example during a state update.
render: function() {},
// Is called to update the position of this elements DOM node.
// It is called during movements of the objects and some of
// the objects call it within the render() function to place
// the objects during render() processing.
place: function() {},
// Is called by the parent element to add this elements DOM
// object to the parent elements DOM object
draw: function() {
if (this.dom_obj && !this.dom_obj.parentNode)
this.obj.dom_obj.appendChild(this.dom_obj);
},
// Is called by the parent element to remove this elements DOM
// object from the parent elements DOM object. This is the counterpart
// of the draw() method.
erase: function() {
// FIXME: Remove all possible event handlers. Just to be
// sure to prevent memory leaks
if (this.dom_obj && this.dom_obj.parentNode)
this.obj.dom_obj.removeChild(this.dom_obj);
},
// When the object is intially locked this is called once
// during initialization and whenever the object shal be
// locked
lock: function() {},
// When the object is intially unlocked this is called once
// during initialization and whenever the object shal be
// unlocked
unlock: function() {},
// Is called to add this element to the parent element
addTo: function(obj) {
obj.addElement(this);
return this;
},
// Is called to remove this element from the parent element
removeFrom: function(obj) {
obj.removeElement(this);
return this;
},
//
// Some internal helper functions
//
// This enables/disables the the object left click action (link)
toggleLink: function(enable) {
if (enable) {
if (this.obj.trigger_obj.parentNode.tagName == 'A') {
this.obj.trigger_obj.parentNode.onclick = null;
}
} else if (!enable) {
if (this.obj.trigger_obj.parentNode.tagName == 'A') {
this.obj.trigger_obj.parentNode.onclick = function(event) {
var event = !event ? window.event : event;
if(event.stopPropagation)
event.stopPropagation();
event.cancelBubble = true;
return false;
};
}
}
}
});
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