///import core
///import plugins\paragraph.js
///commands 行间距
///commandsName  LineHeight
///commandsTitle  行间距
/**
 * @description 设置行内间距
 * @name baidu.editor.execCommand
 * @param   {String}   cmdName     lineheight设置行内间距
 * @param   {String}   value              值
 * @author zhuwenxuan
 */
UE.plugins['lineheight'] = function(){
    var me = this;
    me.setOpt({'lineheight':['1', '1.5','1.75','2', '3', '4', '5']});
    me.commands['lineheight'] =  {
        execCommand : function( cmdName,value ) {
            this.execCommand('paragraph','p',{style:'line-height:'+ (value == "1" ? "normal" : value + 'em') });
            return true;
        },
        queryCommandValue : function() {
            var pN = domUtils.filterNodeList(this.selection.getStartElementPath(),function(node){return domUtils.isBlockElm(node)});
            if(pN){
                var value = domUtils.getComputedStyle(pN,'line-height');
                return value == 'normal' ? 1 : value.replace(/[^\d.]*/ig,"");
            }
        }
    };
};