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lineeditnext/lineeditnext.pro

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+#-------------------------------------------------
+#
+# Project created by QtCreator 2019-10-28T13:44:49
+#
+#-------------------------------------------------
+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = lineeditnext
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which as been marked as deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+
+SOURCES += main.cpp\
+        widget.cpp
+
+HEADERS  += widget.h
+
+FORMS    += widget.ui

lineeditnext/main.cpp

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+#include "widget.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    Widget w;
+    w.show();
+
+    return a.exec();
+}

lineeditnext/widget.cpp

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+#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();
+    }
+}

lineeditnext/widget.h

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+#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

lineeditnext/widget.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Widget</class>
+ <widget class="QWidget" name="Widget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Widget</string>
+  </property>
+  <widget class="QLineEdit" name="lineEdit1">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>10</y>
+     <width>113</width>
+     <height>20</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QLineEdit" name="lineEdit2">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>40</y>
+     <width>113</width>
+     <height>20</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QLineEdit" name="lineEdit3">
+   <property name="geometry">
+    <rect>
+     <x>10</x>
+     <y>70</y>
+     <width>113</width>
+     <height>20</height>
+    </rect>
+   </property>
+  </widget>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <resources/>
+ <connections/>
+</ui>