// FontChanger
// Copyright (c) 2007 Hirotaka Ogawa
// REQUIRES: prototype.js, cookiemanager.js
FontChanger = Class.create();
FontChanger.prototype = {
  id: null,
  cookieManager: null,
  cookieName: 'body.style.fontSize',
  initialize: function(id) {
    this.id = id || 'fontChanger';
    this.cookieManager = new CookieManager();

  },
  setCookieShelfLife: function(days) {
    this.cookieManager.cookieShelfLife = days;
  },
  change: function(fontSize) {
    if(fontSize == ''){
      fontSize = this.cookieManager.getCookie(this.cookieName);
      if(fontSize == '' || fontSize == 'null'){
        fontSize = '80%';
      }
    }
    document.body.style.fontSize = fontSize;
    this.cookieManager.setCookie(this.cookieName, fontSize);
    var imgMM = "/common/img/bt_font_m_off.gif";
    var imgLL = "/common/img/bt_font_l_off.gif";
    if(fontSize == '100%'){
        imgLL = "/common/img/bt_font_l_on.gif";
    }else{
        imgMM = "/common/img/bt_font_m_on.gif";
    }
    var id = this.id;
    $(id + '-medium' ).src = imgMM;
    $(id + '-large' ).src = imgLL;
  },
  reset: function() {
    document.body.style.fontSize = '';
    this.cookieManager.clearCookie(this.cookieName);
  },
  show: function() {
    var id = this.id;
    document.writeln([
    '<div id="' + id + '">',
    '<img src="/common/img/title_font.gif" width="86" height="20" alt="文字のサイズ" class="title" />',
    '<ul class="clearfix">',
    '<li><img src="/common/img/bt_font_m_on.gif" width="15" height="14" alt="中" title="文字のサイズを「中」にします" id="' + id + '-medium" /></li>',
    '<li><img src="/common/img/bt_font_l_off.gif" width="15" height="14" alt="大" title="文字のサイズを「大」にします" id="' + id + '-large" /></li>',
    '</ul>',
    '</div>'
    ].join("\n"));
    Event.observe($(id + '-medium'), 'click', this.onClickMedium.bind(this));
    Event.observe($(id + '-large' ), 'click', this.onClickLarge.bind(this));
  },
  onClickMedium: function(e) { this.change('80%'); },
  onClickLarge:  function(e) { this.change('100%'); }
};
// Bootstrap
FontChanger.start = function(id) {
  var fontChanger = new FontChanger(id);
  fontChanger.setCookieShelfLife(90);
  fontChanger.show();
  fontChanger.change('');
};