/**
 *  $Id: vk_iframe.js 546 2009-02-27 08:53:11Z 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: 546 $
 *  @lastchange $Author: wingedfox $ $Date: 2009-02-27 11:53:11 +0300 (Птн, 27 Фев 2009) $
 *  @class IFrameVirtualKeyboard
 *  @constructor
 */

IFrameVirtualKeyboard = new function() {
    var self = this;
    /**
     *  popup window handler
     * 
     *  @type {Window}
     *  @scope private
     */
    var hWnd = null;
    /**
     *  Frame with the keyboard
     *
     *  @type {HTMLIFrame}
     *  @scope private
     */
    var iFrame = null;
    /**
     *  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_iframe.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.VirtualKeyboard)
            return hWnd.VirtualKeyboard.attachInput(el);
        return false;
    }
    /**
     *  Shows keyboard
     *
     *  @param {HTMLElement, String} input element or it to bind keyboard to
     *  @return {Boolean} operation state
     *  @scope public
     */
    self.open =
    self.show = function (target,holder) {
        var retval = false;
        if ('string' == typeof holder)
            holder = document.getElementById(holder);
        if (!holder)
            return false;

        if (!hWnd) {
            hWnd = document.createElement('div');
            hWnd.innerHTML = "<iframe frameborder=\"0\" src=\""+p+"vk_iframe.html\"></iframe>";
            holder.appendChild(hWnd);
            iFrame=hWnd.firstChild;
            retval = true;
        }
        if (iFrame&&!self.isOpen()) {
            iFrame.style.display = 'block';
            retval = true;
        }
        if (retval) {
            if (holder != iFrame.parentNode)
                holder.appendChild(iFrame);
            tgt = target;
        }
        return false;
    }
    /**
     *  Hides keyboard
     *
     *  @scope public
     */
    self.close = 
    self.hide = function (target) {
        if (self.isOpen()) iFrame.style.display='none';
    }
    /**
     *  Returns open state
     *
     *
     */
    self.isOpen = function () {
        return iFrame&&'block'==iFrame.style.display;
    }
    /**
     *  Toggles keyboard state
     *
     *  @param {HTMLElement, String} input element or it to bind keyboard to
     *  @param {HTMLElement, String} holder to draw keyboard in
     *  @return {Boolean} operation state
     *  @access public
     */
    self.toggle = function (input,holder) {
        self.isOpen()?self.close():self.open(input,holder);
    }
    /**
     *  Onload callback event, invoked from the target window when onload event fires
     *
     *  @scope protected
     */
    self.onload = function () {
        hWnd = (iFrame.contentWindow||iFrame.contentDocument.window);

        if ('string' == typeof tgt) 
            tgt = document.getElementById(tgt);
        hWnd.VirtualKeyboard.show( tgt
                                  ,hWnd.document.body
                                  ,hWnd.document.body
                                 );
        /*
        *  set class names to add some styling to html, body
        */
        hWnd.document.body.className = hWnd.document.body.parentNode.className = 'VirtualKeyboardPopup';
        var kbd = hWnd.document.body.firstChild;
        while ("virtualKeyboard" != kbd.id) {
            hWnd.document.body.removeChild(kbd);
            kbd = hWnd.document.body.firstChild;
        }
        iFrame.style.height = kbd.offsetHeight+'px';
        iFrame.style.width = kbd.offsetWidth+'px';
    }
}