照搬

SoftwareDesign/Code/2-2-4/2-2-4.pro

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+
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = 2-2-4
+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

SoftwareDesign/Code/2-2-4/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();
+}

SoftwareDesign/Code/2-2-4/widget.cpp

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+#include "widget.h"
+#include "ui_widget.h"
+#include <QStackedLayout>
+#include <QListWidget>
+#include <QLabel>
+
+Widget::Widget(QWidget *parent) :
+    QWidget(parent),
+    ui(new Ui::Widget)
+{
+    ui->setupUi(this);
+
+    QListWidget *listWidget = new QListWidget();
+    listWidget->addItem("One");
+    listWidget->addItem("Two");
+    listWidget->addItem("Three");
+
+    QWidget *widget1 = new QWidget();
+    QWidget *widget2 = new QWidget();
+    QWidget *widget3 = new QWidget();
+
+    QLabel *label1 = new QLabel("LABEL ONE", widget1);
+    QLabel *label2 = new QLabel("LABEL TWO", widget2);
+    QLabel *label3 = new QLabel("LABEL THREE", widget3);
+
+    QStackedLayout *sLayout = new QStackedLayout();
+    sLayout->addWidget(widget1);
+    sLayout->addWidget(widget2);
+    sLayout->addWidget(widget3);
+
+    QHBoxLayout *hLayout = new QHBoxLayout();
+    hLayout->addWidget(listWidget);
+    hLayout->addLayout(sLayout);
+
+    setLayout(hLayout);
+
+    QObject::connect(listWidget, &QListWidget::currentRowChanged, sLayout, &QStackedLayout::setCurrentIndex);
+}
+
+Widget::~Widget()
+{
+    delete ui;
+}

SoftwareDesign/Code/2-2-4/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;
+};
+
+#endif // WIDGET_H

SoftwareDesign/Code/2-2-4/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="QStackedWidget" name="stackedWidget">
+   <property name="geometry">
+    <rect>
+     <x>80</x>
+     <y>140</y>
+     <width>120</width>
+     <height>80</height>
+    </rect>
+   </property>
+   <widget class="QWidget" name="page"/>
+   <widget class="QWidget" name="page_2"/>
+  </widget>
+ </widget>
+ <layoutdefault spacing="6" margin="11"/>
+ <resources/>
+ <connections/>
+</ui>