/**

 @Name：layui.util 工具集
 @Author：贤心
 @License：MIT
    
*/

layui.define('jquery', function(exports){
  "use strict";
  
  var $ = layui.jquery
  
  ,util = {
    //固定块
    fixbar: function(options){  
      options = options || {};
      options.bgcolor = options.bgcolor ? ('background-color:' + options.bgcolor) : '';

      var TOP_BAR = 'layui-fixbar-top', timer, is, icon = [
        options.bar1 === true ? '' : options.bar1 //bar1 - 信息图标
        ,options.bar2 === true ? '' : options.bar2 //bar2 - 问号图标
        ,'' //置顶
      ]
      
      ,dom = $(['<ul class="layui-fixbar">'
        ,options.bar1 ? '<li class="layui-icon" lay-type="bar1" style="'+ options.bgcolor +'">'+ icon[0] +'</li>' : ''
        ,options.bar2 ? '<li class="layui-icon" lay-type="bar2" style="'+ options.bgcolor +'">'+ icon[1] +'</li>' : ''
        ,'<li class="layui-icon '+ TOP_BAR +'" lay-type="top" style="'+ options.bgcolor +'">'+ icon[2] +'</li>'
      ,'</ul>'].join(''))
      
      ,topbar = dom.find('.'+TOP_BAR)
      
      ,scroll = function(){
        var stop = $(document).scrollTop();
        if(stop >= (options.showHeight || 200)){
          is || (topbar.show(), is = 1);
        } else {
          is && (topbar.hide(), is = 0);
        }
      };
      
      if($('.layui-fixbar')[0]) return;
      typeof options.css === 'object' && (dom.css(options.css));
      $('body').append(dom), scroll();
      
      //bar点击事件
      dom.find('li').on('click', function(){
        var othis = $(this), type = othis.attr('lay-type');
        if(type === 'top'){
          $('html,body').animate({
            scrollTop : 0
          }, 200);;
        }
        options.click && options.click.call(this, type);
      });
      
      //Top显示控制
      $(document).on('scroll', function(){
        if(timer) clearTimeout(timer);
        timer = setTimeout(function(){
          scroll();
        }, 100);
      });
    }
  };
  
  exports('util', util);
});