QT中的事件过滤器

处理事件过滤
bool eventFilter(QObject *watched, QEvent *event)
{
 if(watched == ui->lineEdit||watched == ui->lineEdit_2||
            ui->lineEdit_3||ui->lineEdit_4||ui->lineEdit_5||ui->lineEdit_6)
    {
        if(event->type() == QEvent::KeyPress)
        {
            QKeyEvent*e = static_cast<QKeyEvent*>(event);
            if(e->key() == Qt::Key_Space)
            {
                focusNextChild();
            }
            return false; // reture false 不会拦截其他事件,return true 会拦截其他事件
        }
    }
    return QWidget::eventFilter(watched,event);

}
安装事件过滤器
     ui->lineEdit->installEventFilter(this);
    ui->lineEdit_5->installEventFilter(this);
    ui->lineEdit_2->installEventFilter(this);
    ui->lineEdit_3->installEventFilter(this);
    ui->lineEdit_4->installEventFilter(this);
    ui->lineEdit_6->installEventFilter(this);
    6个lineEdit 输入数字后按空格键焦点会跳到下一个控件