1、概述
源码放在文章末尾

该项目实现通过回车键让光标从一个编辑框跳转到另一个编辑框，下面是demo演示：

项目部分代码如下：

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private:
    Ui::Widget *ui;

private slots:
    void next();
};

#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"
#include "qlineedit.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    connect(ui->lineEdit1, SIGNAL(returnPressed()), this, SLOT(next()));
    connect(ui->lineEdit2, SIGNAL(returnPressed()), this, SLOT(next()));
    connect(ui->lineEdit3, SIGNAL(returnPressed()), this, SLOT(next()));
}

Widget::~Widget()
{
    delete ui;
}

void Widget::next()
{
    QLineEdit *lineEdit = (QLineEdit *)sender();
    if (lineEdit == ui->lineEdit1) {
        ui->lineEdit2->setFocus();
    } else if (lineEdit == ui->lineEdit2) {
        ui->lineEdit3->setFocus();
    } else if (lineEdit == ui->lineEdit3) {
        ui->lineEdit1->setFocus();
    }
}

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