QtQCompleter自动补全的实现

    QStringList country;
    country<<"China"<<"Japan"<<"English"<<"Endian"<<"American"<<"Australia";
    QCompleter *completer = new QCompleter(country, this);
    completer->setCaseSensitivity(Qt::CaseInsensitive);
    ui->lineEdit->setCompleter(completer);

    QDirModel *model = new QDirModel(this);
    QCompleter *completer = new QCompleter(this);
    completer->setModel(model);
    ui->lineEdit->setCompleter(completer);

completer->setFilterMode(Qt::MatchStartsWith);
//Qt::MatchStartsWith //default 开头匹配
//Qt::MatchContains // 内容匹配
//Qt::MatchEndsWith //结尾匹配

completer->setCompletionMode(QCompleter::PopupCompletion);
//QCompleter::InlineCompletion
//QCompleter::UnfilteredPopupCompletion

completer->setMaxVisibleItems(5);