text: /*
  
  This file is part of Ext JS 4
  
  Copyright (c) 2011 Sencha Inc
  
  Contact:  http://www.sencha.com/contact
  
  GNU General Public License Usage
  This file may be used under the terms of the GNU General Public License version 3.0 as published by the Free Software Foundation and appearing in the file LICENSE included in the packaging of this file.  Please review the following information to ensure the GNU General Public License version 3.0 requirements will be met: http://www.gnu.org/copyleft/gpl.html.
  
  If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact.
  
  */
  /**
   * Base class that provides a common interface for publishing events. Subclasses are expected to to have a property
   * "events" with all the events defined, and, optionally, a property "listeners" with configured listeners defined.
   *
   * For example:
   *
   *     Ext.define('Employee', {
   *         extend: 'Ext.util.Observable',
   *         constructor: function(config){
   *             this.name = config.name;
   *             this.addEvents({
   *                 "fired" : true,
   *                 "quit" : true
   *             });
   *
   *             // Copy configured listeners into *this* object so that the base class's
   *             // constructor will add them.
   *             this.listeners = config.listeners;
   *
   *             // Call our superclass constructor to complete construction process.
   *             Employee.superclass.constructor.call(this, config)
   *         }
   *     });
   *
   * This could then be used like this:
   *
   *     var newEmployee = new Employee({
   *         name: employeeName,
   *         listeners: {
   *             quit: function() {
   *                 // By default, "this" will be the object that fired the event.
   *                 alert(this.name + " has quit!");
   *             }
   *         }
   *     });
   */
  Ext.define('Ext.util.Observable', {
  
      /* Begin Definitions */
  
      requires: ['Ext.util.Event'],
  
      statics: {
          /**
           * Removes **all** added captures from the Observable.
           *
           * @param {Observable} o The Observable to release
           * @static
           */
          releaseCapture: function(o) {
              o.fireEvent = this.prototype.fireEvent;
          },
  
          /**
           * Starts capture on the specified Observable. All events will be passed to the supplied function with the event
           * name + standard signature of the event **before** the event is fired. If the supplied function returns false,
           * the event will not fire.
           *
           * @param {Observable} o The Observable to capture events from.
           * @param {Function} fn The function to call when an event is fired.
           * @param {Object} scope (optional) The scope (`this` reference) in which the function is executed. Defaults to
           * the Observable firing the event.
           * @static
           */
          capture: function(o, fn, scope) {
              o.fireEvent = Ext.Function.createInterceptor(o.fireEvent, fn, scope);
          },
  
          /**
           * Sets observability on the passed class constructor.
           *
           * This makes any event fired on any instance of the passed class also fire a single event through
           * the **class** allowing for central handling of events on many instances at once.
           *
           * Usage:
           *
           *     Ext.util.Observable.observe(Ext.data.Connection);
           *     Ext.data.Connection.on('beforerequest', function(con, options) {
           *         console.log('Ajax request made to ' + options.url);
           *     });
           *
           * @param {Function} c The class constructor to make observable.
           * @param {Object} listeners An object containing a series of listeners to add. See {@link #addListener}.
           * @static
           */
          observe: function(cls, listeners) {
              if (cls) {
                  if (!cls.isObservable) {
                      Ext.applyIf(cls, new this());
                      this.capture(cls.prototype, cls.fireEvent, cls);
                  }
                  if (Ext.isObject(listeners)) {
                      cls.on(listeners);
                  }
                  return cls;
              }
          }
      },
  
      /* End Definitions */
  
      /**
       * @cfg {Object} listeners
       *
       * A config object containing one or more event handlers to be added to this object during initialization. This
       * should be a valid listeners config object as specified in the {@link #addListener} example for attaching multiple
       * handlers at once.
       *
       * **DOM events from ExtJS {@link Ext.Component Components}**
       *
       * While _some_ ExtJs Component classes export selected DOM events (e.g. "click", "mouseover" etc), this is usually
       * only done when extra value can be added. For example the {@link Ext.view.View DataView}'s **`{@link
       * Ext.view.View#itemclick itemclick}`** event passing the node clicked on. To access DOM events directly from a
       * child element of a Component, we need to specify the `element` option to identify the Component property to add a
       * DOM listener to:
       *
       *     new Ext.panel.Panel({
       *         width: 400,
       *         height: 200,
       *         dockedItems: [{
       *             xtype: 'toolbar'
       *         }],
       *         listeners: {
       *             click: {
       *                 element: 'el', //bind to the underlying el property on the panel
       *                 fn: function(){ console.log('click el'); }
       *             },
       *             dblclick: {
       *                 element: 'body', //bind to the underlying body property on the panel
       *                 fn: function(){ console.log('dblclick body'); }
       *             }
       *         }
       *     });
       */
      // @private
      isObservable: true,
  
      constructor: function(config) {
          var me = this;
  
          Ext.apply(me, config);
          if (me.listeners) {
              me.on(me.listeners);
              delete me.listeners;
          }
          me.events = me.events || {};
  
          if (me.bubbleEvents) {
              me.enableBubble(me.bubbleEvents);
          }
      },
  
      // @private
      eventOptionsRe : /^(?:scope|delay|buffer|single|stopEvent|preventDefault|stopPropagation|normalized|args|delegate|element|vertical|horizontal)$/,
  
      /**
       * Adds listeners to any Observable object (or Element) which are automatically removed when this Component is
       * destroyed.
       *
       * @param {Observable/Element} item The item to which to add a listener/listeners.
       * @param {Object/String} ename The event name, or an object containing event name properties.
       * @param {Function} fn (optional) If the `ename` parameter was an event name, this is the handler function.
       * @param {Object} scope (optional) If the `ename` parameter was an event name, this is the scope (`this` reference)
       * in which the handler function is executed.
       * @param {Object} opt (optional) If the `ename` parameter was an event name, this is the
       * {@link Ext.util.Observable#addListener addListener} options.
       */
      addManagedListener : function(item, ename, fn, scope, options) {
          var me = this,
              managedListeners = me.managedListeners = me.managedListeners || [],
              config;
  
          if (typeof ename !== 'string') {
              options = ename;
              for (ename in options) {
                  if (options.hasOwnProperty(ename)) {
                      config = options[ename];
                      if (!me.eventOptionsRe.test(ename)) {
                          me.addManagedListener(item, ename, config.fn || config, config.scope || options.scope, config.fn ? config : options);
                      }
                  }
              }
          }
          else {
              managedListeners.push({
                  item: item,
                  ename: ename,
                  fn: fn,
                  scope: scope,
                  options: options
              });
  
              item.on(ename, fn, scope, options);
          }
      },
  
      /**
       * Removes listeners that were added by the {@link #mon} method.
       *
       * @param {Observable|Element} item The item from which to remove a listener/listeners.
       * @param {Object|String} ename The event name, or an object containing event name properties.
       * @param {Function} fn Optional. If the `ename` parameter was an event name, this is the handler function.
       * @param {Object} scope Optional. If the `ename` parameter was an event name, this is the scope (`this` reference)
       * in which the handler function is executed.
       */
      removeManagedListener : function(item, ename, fn, scope) {
          var me = this,
              options,
              config,
              managedListeners,
              length,
              i;
  
          if (typeof ename !== 'string') {
              options = ename;
              for (ename in options) {
                  if (options.hasOwnProperty(ename)) {
                      config = options[ename];
                      if (!me.eventOptionsRe.test(ename)) {
                          me.removeManagedListener(item, ename, config.fn || config, config.scope || options.scope);
                      }
                  }
              }
          }
  
          managedListeners = me.managedListeners ? me.managedListeners.slice() : [];
  
          for (i = 0, length = managedListeners.length; i < length; i++) {
              me.removeManagedListenerItem(false, managedListeners[i], item, ename, fn, scope);
          }
      },
  
      /**
       * Fires the specified event with the passed parameters (minus the event name, plus the `options` object passed
       * to {@link #addListener}).
       *
       * An event may be set to bubble up an Observable parent hierarchy (See {@link Ext.Component#getBubbleTarget}) by
       * calling {@link #enableBubble}.
       *
       * @param {String} eventName The name of the event to fire.
       * @param {Object...} args Variable number of parameters are passed to handlers.
       * @return {Boolean} returns false if any of the handlers return false otherwise it returns true.
       */
      fireEvent: function() {
          var me = this,
              args = Ext.Array.toArray(arguments),
              ename = args[0].toLowerCase(),
              ret = true,
              event = me.events[ename],
              queue = me.eventQueue,
              parent;
  
          if (me.eventsSuspended === true) {
              if (queue) {
                  queue.push(args);
              }
          } else if (event && event !== true) {
              if (event.bubble) {
                  if (event.fire.apply(event, args.slice(1)) === false) {
                      return false;
                  }
                  parent = me.getBubbleTarget && me.getBubbleTarget();
                  if (parent && parent.isObservable) {
                      if (!parent.events[ename] || parent.events[ename] === true || !parent.events[ename].bubble) {
                          parent.enableBubble(ename);
                      }
                      return parent.fireEvent.apply(parent, args);
                  }                
              }
              else {
                  args.shift();
                  ret = event.fire.apply(event, args);
              }
          }
          return ret;
      },
  
      /**
       * Appends an event handler to this object.
       *
       * @param {String} eventName The name of the event to listen for. May also be an object who's property names are
       * event names.
       * @param {Function} handler The method the event invokes.  Will be called with arguments given to
       * {@link #fireEvent} plus the `options` parameter described below.
       * @param {Object} scope (optional) The scope (`this` reference) in which the handler function is executed. **If
       * omitted, defaults to the object which fired the event.**
       * @param {Object} options (optional) An object containing handler configuration.
       * 
       * **Note:** Unlike in ExtJS 3.x, the options object will also be passed as the last argument to every event handler.
       *
       * This object may contain any of the following properties:
       *
       * - **scope** : Object
       *
       *   The scope (`this` reference) in which the handler function is executed. **If omitted, defaults to the object
       *   which fired the event.**
       *
       * - **delay** : Number
       *
       *   The number of milliseconds to delay the invocation of the handler after the event fires.
       *
       * - **single** : Boolean
       *
       *   True to add a handler to handle just the next firing of the event, and then remove itself.
       *
       * - **buffer** : Number
       *
       *   Causes the handler to be scheduled to run in an {@link Ext.util.DelayedTask} delayed by the specified number of
       *   milliseconds. If the event fires again within that time, the original handler is _not_ invoked, but the new
       *   handler is scheduled in its place.
       *
       * - **target** : Observable
       *
       *   Only call the handler if the event was fired on the target Observable, _not_ if the event was bubbled up from a
       *   child Observable.
       *
       * - **element** : String
       *
       *   **This option is only valid for listeners bound to {@link Ext.Component Components}.** The name of a Component
       *   property which references an element to add a listener to.
       *
       *   This option is useful during Component construction to add DOM event listeners to elements of
       *   {@link Ext.Component Components} which will exist only after the Component is rendered.
       *   For example, to add a click listener to a Panel's body:
       *
       *       new Ext.panel.Panel({
       *           title: 'The title',
       *           listeners: {
       *               click: this.handlePanelClick,
       *               element: 'body'
       *           }
       *       });
       *
       * **Combining Options**
       *
       * Using the options argument, it is possible to combine different types of listeners:
       *
       * A delayed, one-time listener.
       *
       *     myPanel.on('hide', this.handleClick, this, {
       *         single: true,
       *         delay: 100
       *     });
       *
       * **Attaching multiple handlers in 1 call**
       *
       * The method also allows for a single argument to be passed which is a config object containing properties which
       * specify multiple events. For example:
       *
       *     myGridPanel.on({
       *         cellClick: this.onCellClick,
       *         mouseover: this.onMouseOver,
       *         mouseout: this.onMouseOut,
       *         scope: this // Important. Ensure "this" is correct during handler execution
       *     });
       *
       * One can also specify options for each event handler separately:
       *
       *     myGridPanel.on({
       *         cellClick: {fn: this.onCellClick, scope: this, single: true},
       *         mouseover: {fn: panel.onMouseOver, scope: panel}
       *     });
       *
       */
      addListener: function(ename, fn, scope, options) {
          var me = this,
              config,
              event;
  
          if (typeof ename !== 'string') {
              options = ename;
              for (ename in options) {
                  if (options.hasOwnProperty(ename)) {
                      config = options[ename];
                      if (!me.eventOptionsRe.test(ename)) {
                          me.addListener(ename, config.fn || config, config.scope || options.scope, config.fn ? config : options);
                      }
                  }
              }
          }
          else {
              ename = ename.toLowerCase();
              me.events[ename] = me.events[ename] || true;
              event = me.events[ename] || true;
              if (Ext.isBoolean(event)) {
                  me.events[ename] = event = new Ext.util.Event(me, ename);
              }
              event.addListener(fn, scope, Ext.isObject(options) ? options : {});
          }
      },
  
      /**
       * Removes an event handler.
       *
       * @param {String} eventName The type of event the handler was associated with.
       * @param {Function} handler The handler to remove. **This must be a reference to the function passed into the
       * {@link #addListener} call.**
       * @param {Object} scope (optional) The scope originally specified for the handler.
       */
      removeListener: function(ename, fn, scope) {
          var me = this,
              config,
              event,
              options;
  
          if (typeof ename !== 'string') {
              options = ename;
              for (ename in options) {
                  if (options.hasOwnProperty(ename)) {
                      config = options[ename];
                      if (!me.eventOptionsRe.test(ename)) {
                          me.removeListener(ename, config.fn || config, config.scope || options.scope);
                      }
                  }
              }
          } else {
              ename = ename.toLowerCase();
              event = me.events[ename];
              if (event && event.isEvent) {
                  event.removeListener(fn, scope);
              }
          }
      },
  
      /**
       * Removes all listeners for this object including the managed listeners
       */
      clearListeners: function() {
          var events = this.events,
              event,
              key;
  
          for (key in events) {
              if (events.hasOwnProperty(key)) {
                  event = events[key];
                  if (event.isEvent) {
                      event.clearListeners();
                  }
              }
          }
  
          this.clearManagedListeners();
      },
  
      //<debug>
      purgeListeners : function() {
          if (Ext.global.console) {
              Ext.global.console.warn('Observable: purgeListeners has been deprecated. Please use clearListeners.');
          }
          return this.clearListeners.apply(this, arguments);
      },
      //</debug>
  
      /**
       * Removes all managed listeners for this object.
       */
      clearManagedListeners : function() {
          var managedListeners = this.managedListeners || [],
              i = 0,
              len = managedListeners.length;
  
          for (; i < len; i++) {
              this.removeManagedListenerItem(true, managedListeners[i]);
          }
  
          this.managedListeners = [];
      },
      
      /**
       * Remove a single managed listener item
       * @private
       * @param {Boolean} isClear True if this is being called during a clear
       * @param {Object} managedListener The managed listener item
       * See removeManagedListener for other args
       */
      removeManagedListenerItem: function(isClear, managedListener, item, ename, fn, scope){
          if (isClear || (managedListener.item === item && managedListener.ename === ename && (!fn || managedListener.fn === fn) && (!scope || managedListener.scope === scope))) {
              managedListener.item.un(managedListener.ename, managedListener.fn, managedListener.scope);
              if (!isClear) {
                  Ext.Array.remove(this.managedListeners, managedListener);
              }    
          }
      },
  
      //<debug>
      purgeManagedListeners : function() {
          if (Ext.global.console) {
              Ext.global.console.warn('Observable: purgeManagedListeners has been deprecated. Please use clearManagedListeners.');
          }
          return this.clearManagedListeners.apply(this, arguments);
      },
      //</debug>
  
      /**
       * Adds the specified events to the list of events which this Observable may fire.
       *
       * @param {Object/String} o Either an object with event names as properties with a value of `true` or the first
       * event name string if multiple event names are being passed as separate parameters. Usage:
       *
       *     this.addEvents({
       *         storeloaded: true,
       *         storecleared: true
       *     });
       *
       * @param {String...} more Optional additional event names if multiple event names are being passed as separate
       * parameters. Usage:
       *
       *     this.addEvents('storeloaded', 'storecleared');
       *
       */
      addEvents: function(o) {
          var me = this,
              args,
              len,
              i;
              
              me.events = me.events || {};
          if (Ext.isString(o)) {
              args = arguments;
              i = args.length;
              
              while (i--) {
                  me.events[args[i]] = me.events[args[i]] || true;
              }
          } else {
              Ext.applyIf(me.events, o);
          }
      },
  
      /**
       * Checks to see if this object has any listeners for a specified event
       *
       * @param {String} eventName The name of the event to check for
       * @return {Boolean} True if the event is being listened for, else false
       */
      hasListener: function(ename) {
          var event = this.events[ename.toLowerCase()];
          return event && event.isEvent === true && event.listeners.length > 0;
      },
  
      /**
       * Suspends the firing of all events. (see {@link #resumeEvents})
       *
       * @param {Boolean} queueSuspended Pass as true to queue up suspended events to be fired
       * after the {@link #resumeEvents} call instead of discarding all suspended events.
       */
      suspendEvents: function(queueSuspended) {
          this.eventsSuspended = true;
          if (queueSuspended && !this.eventQueue) {
              this.eventQueue = [];
          }
      },
  
      /**
       * Resumes firing events (see {@link #suspendEvents}).
       * 
       * If events were suspended using the `**queueSuspended**` parameter, then all events fired
       * during event suspension will be sent to any listeners now.
       */
      resumeEvents: function() {
          var me = this,
              queued = me.eventQueue || [];
  
          me.eventsSuspended = false;
          delete me.eventQueue;
  
          Ext.each(queued,
          function(e) {
              me.fireEvent.apply(me, e);
          });
      },
  
      /**
       * Relays selected events from the specified Observable as if the events were fired by `this`.
       *
       * @param {Object} origin The Observable whose events this object is to relay.
       * @param {[String]} events Array of event names to relay.
       * @param {Object} prefix
       */
      relayEvents : function(origin, events, prefix) {
          prefix = prefix || '';
          var me = this,
              len = events.length,
              i = 0,
              oldName,
              newName;
  
          for (; i < len; i++) {
              oldName = events[i].substr(prefix.length);
              newName = prefix + oldName;
              me.events[newName] = me.events[newName] || true;
              origin.on(oldName, me.createRelayer(newName));
          }
      },
  
      /**
       * @private
       * Creates an event handling function which refires the event from this object as the passed event name.
       * @param newName
       * @returns {Function}
       */
      createRelayer: function(newName){
          var me = this;
          return function(){
              return me.fireEvent.apply(me, [newName].concat(Array.prototype.slice.call(arguments, 0, -1)));
          };
      },
  
      /**
       * Enables events fired by this Observable to bubble up an owner hierarchy by calling `this.getBubbleTarget()` if
       * present. There is no implementation in the Observable base class.
       *
       * This is commonly used by Ext.Components to bubble events to owner Containers.
       * See {@link Ext.Component#getBubbleTarget}. The default implementation in Ext.Component returns the
       * Component's immediate owner. But if a known target is required, this can be overridden to access the
       * required target more quickly.
       *
       * Example:
       *
       *     Ext.override(Ext.form.field.Base, {
       *         //  Add functionality to Field's initComponent to enable the change event to bubble
       *         initComponent : Ext.Function.createSequence(Ext.form.field.Base.prototype.initComponent, function() {
       *             this.enableBubble('change');
       *         }),
       *
       *         //  We know that we want Field's events to bubble directly to the FormPanel.
       *         getBubbleTarget : function() {
       *             if (!this.formPanel) {
       *                 this.formPanel = this.findParentByType('form');
       *             }
       *             return this.formPanel;
       *         }
       *     });
       *
       *     var myForm = new Ext.formPanel({
       *         title: 'User Details',
       *         items: [{
       *             ...
       *         }],
       *         listeners: {
       *             change: function() {
       *                 // Title goes red if form has been modified.
       *                 myForm.header.setStyle('color', 'red');
       *             }
       *         }
       *     });
       *
       * @param {String/[String]} events The event name to bubble, or an Array of event names.
       */
      enableBubble: function(events) {
          var me = this;
          if (!Ext.isEmpty(events)) {
              events = Ext.isArray(events) ? events: Ext.Array.toArray(arguments);
              Ext.each(events,
              function(ename) {
                  ename = ename.toLowerCase();
                  var ce = me.events[ename] || true;
                  if (Ext.isBoolean(ce)) {
                      ce = new Ext.util.Event(me, ename);
                      me.events[ename] = ce;
                  }
                  ce.bubble = true;
              });
          }
      }
  }, function() {
  
      this.createAlias({
          /**
           * @method
           * Shorthand for {@link #addListener}.
           * @alias Ext.util.Observable#addListener
           */
          on: 'addListener',
          /**
           * @method
           * Shorthand for {@link #removeListener}.
           * @alias Ext.util.Observable#removeListener
           */
          un: 'removeListener',
          /**
           * @method
           * Shorthand for {@link #addManagedListener}.
           * @alias Ext.util.Observable#addManagedListener
           */
          mon: 'addManagedListener',
          /**
           * @method
           * Shorthand for {@link #removeManagedListener}.
           * @alias Ext.util.Observable#removeManagedListener
           */
          mun: 'removeManagedListener'
      });
  
      //deprecated, will be removed in 5.0
      this.observeClass = this.observe;
  
      Ext.apply(Ext.util.Observable.prototype, function(){
          // this is considered experimental (along with beforeMethod, afterMethod, removeMethodListener?)
          // allows for easier interceptor and sequences, including cancelling and overwriting the return value of the call
          // private
          function getMethodEvent(method){
              var e = (this.methodEvents = this.methodEvents || {})[method],
                  returnValue,
                  v,
                  cancel,
                  obj = this;
  
              if (!e) {
                  this.methodEvents[method] = e = {};
                  e.originalFn = this[method];
                  e.methodName = method;
                  e.before = [];
                  e.after = [];
  
                  var makeCall = function(fn, scope, args){
                      if((v = fn.apply(scope || obj, args)) !== undefined){
                          if (typeof v == 'object') {
                              if(v.returnValue !== undefined){
                                  returnValue = v.returnValue;
                              }else{
                                  returnValue = v;
                              }
                              cancel = !!v.cancel;
                          }
                          else
                              if (v === false) {
                                  cancel = true;
                              }
                              else {
                                  returnValue = v;
                              }
                      }
                  };
  
                  this[method] = function(){
                      var args = Array.prototype.slice.call(arguments, 0),
                          b, i, len;
                      returnValue = v = undefined;
                      cancel = false;
  
                      for(i = 0, len = e.before.length; i < len; i++){
                          b = e.before[i];
                          makeCall(b.fn, b.scope, args);
                          if (cancel) {
                              return returnValue;
                          }
                      }
  
                      if((v = e.originalFn.apply(obj, args)) !== undefined){
                          returnValue = v;
                      }
  
                      for(i = 0, len = e.after.length; i < len; i++){
                          b = e.after[i];
                          makeCall(b.fn, b.scope, args);
                          if (cancel) {
                              return returnValue;
                          }
                      }
                      return returnValue;
                  };
              }
              return e;
          }
  
          return {
              // these are considered experimental
              // allows for easier interceptor and sequences, including cancelling and overwriting the return value of the call
              // adds an 'interceptor' called before the original method
              beforeMethod : function(method, fn, scope){
                  getMethodEvent.call(this, method).before.push({
                      fn: fn,
                      scope: scope
                  });
              },
  
              // adds a 'sequence' called after the original method
              afterMethod : function(method, fn, scope){
                  getMethodEvent.call(this, method).after.push({
                      fn: fn,
                      scope: scope
                  });
              },
  
              removeMethodListener: function(method, fn, scope){
                  var e = this.getMethodEvent(method),
                      i, len;
                  for(i = 0, len = e.before.length; i < len; i++){
                      if(e.before[i].fn == fn && e.before[i].scope == scope){
                          Ext.Array.erase(e.before, i, 1);
                          return;
                      }
                  }
                  for(i = 0, len = e.after.length; i < len; i++){
                      if(e.after[i].fn == fn && e.after[i].scope == scope){
                          Ext.Array.erase(e.after, i, 1);
                          return;
                      }
                  }
              },
  
              toggleEventLogging: function(toggle) {
                  Ext.util.Observable[toggle ? 'capture' : 'releaseCapture'](this, function(en) {
                      if (Ext.isDefined(Ext.global.console)) {
                          Ext.global.console.log(en, arguments);
                      }
                  });
              }
          };
      }());
  });
  
  