/**

 * Copyright (c) 2009-2010 Symbian Foundation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 * 

 * Contributors:

 * 

 * Description:

 * 

 */

///////////////////////////////////////////////////////////////////////////////

// The UIElement class is the base class for all user interface elements.

// Constructor.

function UIElement(id) {

    if (id != UI_NO_INIT_ID) {

        this.init(id);

    }

}

// UI element identifier.

UIElement.prototype.id = null;

// Root HTML element in the UI element.

UIElement.prototype.rootElement = null;

// Initializer for UIElement.

UIElement.prototype.init = function(id) {

    uiLogger.debug("UIElement.init(" + id + ")");

    // copy identifier

    this.id = id;

    // init event listener array

    this.eventListeners = [];

    // create the root element

    this.rootElement = document.createElement("div");

    if (id != null) {

        this.rootElement.id = id;

    }

};

// Returns an array containing the current event listeners.

UIElement.prototype.getEventListeners = function() {

    return this.eventListeners;

};

// Adds an event listener.

UIElement.prototype.addEventListener = function(eventType, listener) {

    var listenerDef = { type: eventType, listener: listener };

    this.eventListeners.push(listenerDef);

};

// Removes an event listener.

UIElement.prototype.removeEventListener = function(eventType, listener) {

    // iterate through current listeners and remove the specified

    // listener when its found

    for (var i = 0; i < this.eventListeners.length; i++) {

        var listenerDef = this.eventListeners[i];

        if ((listenerDef.type == eventType) &&

                (listenerDef.listener == listener)) {

            this.eventListeners.splice(i, 1);

            return;

        }

    }

};

// Factory method for an event object where this object is the source object.

UIElement.prototype.createEvent = function(type, value) {

    return { source: this, type: type, value: value };

};

// Fires an event to all listeners.

UIElement.prototype.fireEvent = function(event) {

    // iterate through all event listeners and notify them of the event

    for (var i = 0; i < this.eventListeners.length; i++) {

        var listenerDef = this.eventListeners[i];

        if (listenerDef.type == null || listenerDef.type == event.type) {

            listenerDef.listener.call(this, event);

        }

    }

};