本文编译使用qt5.7源码自带虚拟键盘
步骤如下：
1.下载Qt5.7源码
http://download.qt.io/official_releases/qt/5.7/5.7.0/single/qt-everywhere-opensource-src-5.7.0.zip
解压
2.找到虚拟键盘源码目录qtvirtualkeyboard,进入该目录，执行如下命令：
a：qmake
CONFIG+="lang-en_GB lang-zh_CN" (qmake在qt的bin目录)
b：make
c：make install
3.调用虚拟键盘
main函数添加 qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.xiaopingtou.cn//data/attach/topic/topicKPo7gB.jpg', '推荐 实常在 的文章《linux下qt虚拟键盘》','https://www.xiaopingtou.net/article-74402.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}