#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include<QListWidget>
#include<QStackedWidget>
#include<QLabel>
namespace Ui {
class Dialog;
}
class Dialog : public QDialog
{
    Q_OBJECT
public:
    explicit Dialog(QWidget *parent = nullptr);
    ~Dialog();
private:
    Ui::Dialog *ui;
    QListWidget *list;
    QStackedWidget *stack;
    QLabel* label1;
    QLabel* label2;
    QLabel* label3;
};
#endif // DIALOG_H

#include "dialog.h"
#include "ui_dialog.h"
#include<QHBoxLayout>
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
//    ui->setupUi(this);
    setWindowTitle(tr("StackedWidget"));
    list = new QListWidget(this);
    list->insertItem(0,tr("Window1"));
    list->insertItem(1,tr("Window2"));
    list->insertItem(2,tr("Window3"));
    label1 = new QLabel(tr("WindowTest1"));
    label2 = new QLabel(tr("WindowTest2"));
    label3 = new QLabel(tr("WindowTest3"));
    stack = new QStackedWidget(this);
    //
    stack->addWidget(label1);
    stack->addWidget(label2);
    stack->addWidget(label3);
    QHBoxLayout* mainLayout = new QHBoxLayout(this);
    mainLayout->setMargin(5);
    mainLayout->setSpacing(5);
    mainLayout->addWidget(list);
    mainLayout->addWidget(stack,0,Qt::AlignHCenter);
    mainLayout->setStretchFactor(list,1);
    mainLayout->setStretchFactor(stack,3);
    connect(list,SIGNAL(currentRowChanged(int)),stack,SLOT(setCurrentIndex(int)));
}
Dialog::~Dialog()
{
    delete ui;
}