///import core
///commands 当输入内容超过编辑器高度时，编辑器自动增高
///commandsName  AutoHeight,autoHeightEnabled
///commandsTitle  自动增高
/**
 * @description 自动伸展
 * @author zhanyi
 */
UE.plugins['autoheight'] = function () {
    var me = this;
    //提供开关，就算加载也可以关闭
    me.autoHeightEnabled = me.options.autoHeightEnabled !== false ;
    if (!me.autoHeightEnabled)return;

    var bakOverflow,
        span, tmpNode,
        lastHeight = 0,
        currentHeight,
        timer;
    function adjustHeight() {
        clearTimeout(timer);
        timer = setTimeout(function () {
            if (me.queryCommandState('source') != 1) {
                if (!span) {
                    span = me.document.createElement('span');
                    //trace:1764
                    span.style.cssText = 'display:block;width:0;margin:0;padding:0;border:0;clear:both;';
                    span.innerHTML = '.';
                }
                tmpNode = span.cloneNode(true);
                me.body.appendChild(tmpNode);

                currentHeight = Math.max(domUtils.getXY(tmpNode).y + tmpNode.offsetHeight, me.options.minFrameHeight);

                if (currentHeight != lastHeight) {

                    me.setHeight(currentHeight);

                    lastHeight = currentHeight;
                }

                domUtils.remove(tmpNode);

            }
        }, 50)
    }
    me.addListener('destroy', function () {
        me.removeListener('contentchange', adjustHeight);
        me.removeListener('keyup', adjustHeight);
        me.removeListener('mouseup', adjustHeight);
    });
    me.enableAutoHeight = function () {
        if(!me.autoHeightEnabled)return;
        var doc = me.document;
        me.autoHeightEnabled = true;
        bakOverflow = doc.body.style.overflowY;
        doc.body.style.overflowY = 'hidden';
        me.addListener('contentchange', adjustHeight);
        me.addListener('keyup', adjustHeight);
        me.addListener('mouseup', adjustHeight);
        //ff不给事件算得不对
        setTimeout(function () {
            adjustHeight();
        }, browser.gecko ? 100 : 0);
        me.fireEvent('autoheightchanged', me.autoHeightEnabled);
    };
    me.disableAutoHeight = function () {

        me.body.style.overflowY = bakOverflow || '';

        me.removeListener('contentchange', adjustHeight);
        me.removeListener('keyup', adjustHeight);
        me.removeListener('mouseup', adjustHeight);
        me.autoHeightEnabled = false;
        me.fireEvent('autoheightchanged', me.autoHeightEnabled);
    };
    me.addListener('ready', function () {
        me.enableAutoHeight();
        //trace:1764
        var timer;
        domUtils.on(browser.ie ? me.body : me.document,browser.webkit ? 'dragover' : 'drop',function(){
            clearTimeout(timer);
            timer = setTimeout(function(){
                adjustHeight()
            },100)

        });
    });






};

