/**
 *  $Id: vk_popup.js 625 2009-04-22 09:15:09Z wingedfox $
 *
 *  Keyboard Iframe mode loader
 *
 *  This software is protected by patent No.2009611147 issued on 20.02.2009 by Russian Federal Service for Intellectual Property Patents and Trademarks.
 *
 *  @author Ilya Lebedev
 *  @copyright 2006-2009 Ilya Lebedev <ilya@lebedev.net>
 *  @version $Rev: 625 $
 *  @lastchange $Author: wingedfox $ $Date: 2009-04-22 13:15:09 +0400 (Срд, 22 Апр 2009) $
 *  @class PopupVirtualKeyboard
 *  @constructor
 */
PopupVirtualKeyboard = new function() {
    var self = this;
    /**
     *  popup window handler
     * 
     *  @type {Window}
     *  @scope private
     */
    var hWnd = null;
    /**
     *  Unload handler
     *
     *  @type {Function}
     *  @scope private
     */
    var unloadHandler;
    /**
     *  path to this file
     * 
     *  @type {String}
     */
    var p = (function (sname){var sc = document.getElementsByTagName('script'),sr = new RegExp('^(.*/|)('+sname+')([#?]|$)');for (var i=0,scL=sc.length; i<scL; i++) {var m = String(sc[i].src).match(sr);if (m) {if (m[1].match(/^((https?|file)\:\/{2,}|\w:[\\])/)) return m[1];if (m[1].indexOf("/")==0) return m[1];b = document.getElementsByTagName('base');if (b[0] && b[0].href) return b[0].href+m[1];return (document.location.href.match(/(.*[\/\\])/)[0]+m[1]).replace(/^\/+(?=\w:)/,"");}}return null;})('vk_popup.js');
    /**
     *  Tells, if the keyboard is open
     * 
     *  @return {Boolean}
     *  @scope public
     */
    self.isOpen = function () {
        return null!=hWnd && !hWnd.closed;
    }
    /**
     *  Target input
     *
     *  @type {String}
     *  @scope private
     */
    var tgt = null;
    /**
     *  Attaches keyboard to the specified input field
     *
     *  @param {Null, HTMLInputElement,String} element to attach keyboard to
     *  @return {HTMLInputElement, Null}
     *  @access public
     */
    self.attachInput = function(el) {
        if (hWnd && !hWnd.closed && hWnd.VirtualKeyboard) {
            return hWnd.VirtualKeyboard.attachInput(el);
        }
        return false
    }
    /**
     *  Shows keyboard
     *
     *  @param {HTMLElement, String} input element or it to bind keyboard to
     *  @param {Function} unload monitor
     *  @return {Boolean} operation state
     *  @scope public
     */
    self.open =
    self.show = function (target, unload) {
        if (!hWnd || hWnd.closed) {
          hWnd = (window.showModelessDialog||window.open)(p+"vk_popup.html",window.showModelessDialog?window:"_blank","status=0,title=0,dependent=yes,dialog=yes,resizable=no,scrollbars=no,width=500,height=500");
          unloadHandler = unload;
          tgt = target;
          return true;
        }
        return false;
    }
    /**
     *  Hides keyboard
     *
     *  @scope public
     */
    self.close = 
    self.hide = function (target) {
        if (!hWnd || hWnd.closed) return false;
        if (hWnd.VirtualKeyboard.isOpen()) hWnd.VirtualKeyboard.hide();
        hWnd.close();
        hWnd = null;
        if ('function' == typeof unloadHandler) {
            unloadHandler();
        }
    }
    /**
     *  Toggles keyboard state
     *
     *  @param {HTMLElement, String} input element or it to bind keyboard to
     *  @return {Boolean} operation state
     *  @access public
     */
    self.toggle = function (input) {
        self.isOpen()?self.close():self.open(input);
    }
    /**
     *  Onload callback event, invoked from the target window when onload event fires
     *
     *  @scope protected
     */
    self.onload = function () {
        if ('string' == typeof tgt)
            tgt = document.getElementById(tgt);
        hWnd.VirtualKeyboard.show( tgt
                                  ,hWnd.document.body
                                  ,hWnd.document.body.parentNode
                                 );
        /*
        *  set class names to add some styling to html, body
        */
        hWnd.document.body.className = hWnd.document.body.parentNode.className = 'VirtualKeyboardPopup';
        if (hWnd.sizeToContent) {
            hWnd.sizeToContent();
        } else {
            var kbd = hWnd.document.body.firstChild;
            while ("virtualKeyboard" != kbd.id) {
                hWnd.document.body.removeChild(kbd);
                kbd = hWnd.document.body.firstChild;
            }
            hWnd.dialogHeight = kbd.offsetHeight+'px';
            hWnd.dialogWidth = kbd.offsetWidth+'px';
            hWnd.resizeTo(kbd.offsetWidth+hWnd.DOM.getOffsetWidth()-hWnd.DOM.getClientWidth()
                         ,kbd.offsetHeight+hWnd.DOM.getOffsetHeight()-hWnd.DOM.getClientHeight());
        }
        hWnd.onunload = self.close;
    }
    if (window.attachEvent) window.attachEvent('onunload', self.close);
    else if (window.addEventListener) window.addEventListener('unload', self.close, false);
}