QStackedWidget+QButtonGroup realizes the Tab page effect

Set the button with the selected state, associate the button to QButtonGroup, and associate QStackedWidget display in the QButtonGroup click event. The effect is as follows: The

code is as follows:
testwgt.h

#ifndef TESTWGT_H
#define TESTWGT_H

#include <QWidget>
#include <QButtonGroup>
#include <QStackedWidget>

class TestWgt : public QWidget
{
    
    
    Q_OBJECT

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

private:
    void initObject();
    void initConnect();

private slots:
    void slot_BtnTabGroupChanged(int index);

private:
    QButtonGroup*       m_pTabGroup;
    QStackedWidget*     m_pStackedWgt;
};

#endif // TESTWGT_H

testwgt.cpp

#include "testwgt.h"
#include <QLabel>
#include <QPushButton>
#include <QVBoxLayout>
#include <QHBoxLayout>

TestWgt::TestWgt(QWidget *parent) :
    QWidget(parent,Qt::FramelessWindowHint)
{
    
    
    initObject();
    initConnect();
}

TestWgt::~TestWgt()
{
    
    
}

void TestWgt::initObject()
{
    
    
    this->setFixedSize(400,300);

    QPushButton* pSetBtn1 = new QPushButton();
    pSetBtn1->setFixedSize(100, 30);
    pSetBtn1->setFlat(false);
    pSetBtn1->setCheckable(true);
    pSetBtn1->setChecked(true);
    pSetBtn1->setText(QString::fromLocal8Bit("设置1"));
    pSetBtn1->setObjectName("tabBtn");

    QPushButton* pSetBtn2 = new QPushButton();
    pSetBtn2->setFixedSize(100, 30);
    pSetBtn2->setFlat(false);
    pSetBtn2->setCheckable(true);
    pSetBtn2->setText(QString::fromLocal8Bit("设置2"));
    pSetBtn2->setObjectName("tabBtn");

    QPushButton* pSetBtn3 = new QPushButton();
    pSetBtn3->setFixedSize(100, 30);
    pSetBtn3->setFlat(false);
    pSetBtn3->setCheckable(true);
    pSetBtn3->setText(QString::fromLocal8Bit("设置3"));
    pSetBtn3->setObjectName("tabBtn");

    QHBoxLayout* pTabHlayout  = new QHBoxLayout();
    pTabHlayout->addWidget(pSetBtn1);
    pTabHlayout->addWidget(pSetBtn2);
    pTabHlayout->addWidget(pSetBtn3);

    m_pTabGroup = new QButtonGroup();
    m_pTabGroup->addButton(pSetBtn1, 0);
    m_pTabGroup->addButton(pSetBtn2, 1);
    m_pTabGroup->addButton(pSetBtn3, 2);

    QWidget * pSetWgt1 = new QWidget();
    QLabel* pInfoLabe1 = new QLabel();
    pInfoLabe1->setFixedSize(80, 60);
    pInfoLabe1->setText(QString::fromLocal8Bit("第一页"));
    QHBoxLayout* pHlayout1 = new QHBoxLayout(pSetWgt1);
    pHlayout1->addWidget(pInfoLabe1);
    pHlayout1->setAlignment(pInfoLabe1,Qt::AlignCenter);

    QWidget * pSetWgt2 = new QWidget();
    QLabel* pInfoLabe2 = new QLabel();
    pInfoLabe2->setFixedSize(80, 60);
    pInfoLabe2->setText(QString::fromLocal8Bit("第二页"));
    QHBoxLayout* pHlayout2 = new QHBoxLayout(pSetWgt2);
    pHlayout2->addWidget(pInfoLabe2);
    pHlayout2->setAlignment(pInfoLabe2,Qt::AlignCenter);

    QWidget * pSetWgt3 = new QWidget();
    QLabel* pInfoLabe3 = new QLabel();
    pInfoLabe3->setFixedSize(80, 60);
    pInfoLabe3->setText(QString::fromLocal8Bit("第三页"));
    QHBoxLayout* pHlayout3 = new QHBoxLayout(pSetWgt3);
    pHlayout3->addWidget(pInfoLabe3);
    pHlayout3->setAlignment(pInfoLabe3,Qt::AlignCenter);

    pSetWgt1->setStyleSheet("background-color:red");
    pSetWgt2->setStyleSheet("background-color:green");
    pSetWgt3->setStyleSheet("background-color:blue");

    m_pStackedWgt = new QStackedWidget();
    m_pStackedWgt->insertWidget(0, pSetWgt1);
    m_pStackedWgt->insertWidget(1, pSetWgt2);
    m_pStackedWgt->insertWidget(2, pSetWgt3);

    QVBoxLayout* pSetMainVlayout = new QVBoxLayout(this);
    pSetMainVlayout->setMargin(0);
    pSetMainVlayout->setSpacing(0);
    pSetMainVlayout->addLayout(pTabHlayout);
    pSetMainVlayout->addWidget(m_pStackedWgt);

    this->setStyleSheet(QString("QPushButton:hover#tabBtn{background-color: #3b82ff; outline: none;"
                                "border: none; color: #c3c6d7; font: 16px;}"
                                "QPushButton:Checked#tabBtn{background-color: #3b82ff; outline: none;"));
}

void TestWgt::initConnect()
{
    
    
    connect(m_pTabGroup, SIGNAL(buttonClicked(int)),this, SLOT(slot_BtnTabGroupChanged(int)));
}

void TestWgt::slot_BtnTabGroupChanged(int index)
{
    
    
    if(!m_pStackedWgt)
    {
    
    
        return;
    }

    m_pStackedWgt->setCurrentIndex(index);
}

main.cpp

#include <QApplication>
#include "testwgt.h"

int main(int argc, char *argv[])
{
    
    
    QApplication a(argc, argv);

    TestWgt w;
    w.show();

    return a.exec();
}