QT4QT5均可使用的虚拟键盘 - QTCN开发网

QMap<int, QStringList> VirtualKeyBoard::getChineseListMap(const QString &cur_text)
{
//    QStringList chinese_list{};
    QMap<int, QStringList>list_map{};
    int page(0);
    int index(-1);//计数是否达到最大显示数

    if(cur_text.isEmpty())
        return list_map;
    if(QSqlDatabase::contains("my_sqlite"))
         *db_ = QSqlDatabase::database("my_sqlite");
     else
         *db_ = QSqlDatabase::addDatabase("QSQLITE", "my_sqlite");
    //打开数据库
    if(!db_->open())
    {
        qDebug()<<__func__<<db_->lastError();
        return list_map;
    }
    QString py(cur_text);
    QSqlQuery query(*db_);
    int count(0);
    if( cur_text.size()<last_py_text_.size() && !last_py_.isEmpty())//按了退格键
    {
        last_py_.remove(last_py_.size()-3,1);
    }

        while(1)//根据拼音获取对因汉字/词组
        {
            const QString command = "select PinYin, Chinese from WordAndGroup where PinYin like ""'"+py+"%;'";
            if(!query.exec(command))
            {
                qDebug()<<__func__<<command<<db_->lastError();
                goto error;
            }

            while(query.next())
            {
                if(index++<MAX_VISIBLE-1)
                {
                    list_map[page].append(query.value(1).toString());
                }else
                {
                    page++;
                    index = -1;
                }
            }
            if(list_map[page].size()>0)
            {
                last_py_=py+"%,";
                break;
            }else
            {
                QString str = last_py_;
                str.remove(QRegExp("%,"));
                if(++count==1)//当查询不匹配时，将新加入的词汇当作新词的开头(eg1:guoj--> guo%,j eg2:guoji -->guo%,j%,i)
                {
                    py=last_py_+cur_text.mid(str.size());
                }
                else if(count==2)//若之前可以匹配现在不行，则将新加入的字母当作新词的一部分拼音(eg1:guoj-->guo%,j eg2:guoji -->guo%ji)
                {
                    QString str2 = last_py_;
                    str2.remove(str2.lastIndexOf("%,"), 2);
                    py=str2+cur_text.mid(str.size());

                }else if(count==3)//将"last_py_"最后3个字符替换成"%,"，并补充当前拼音"arg1"尚未补充在"py"上的内容
                {
                    QString str2 = last_py_;
                    str2.remove(str2.lastIndexOf("%,"), str2.size()-str2.lastIndexOf("%,"));
                    str2.insert(str2.size()-1, "%,");
                    py=str2+cur_text.mid(str.size());
                }else
                {
                    break;
                }
            }
        }
//        qDebug()<<chinese_list;
error:
    db_->close();
    last_py_text_=cur_text;

    return list_map;
}