[QT]QStackedWidget学习使用 可用于多界面

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

class QStackedWidget;

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void switchPage();
private:
    Ui::MainWindow *ui;
    QStackedWidget *m_pStackedWidget;

};

#endif // MAINWINDOW_H

#include <QtWidgets>

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include "dialog1.h"
#include "dialog2.h"
#include "dialog3.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
//    QPushButton *pButton = new QPushButton(this);
//    QLabel *pFirstPage= new QLabel(this);
//    QLabel *pSecondPage = new QLabel(this);
//    QLabel *pThirdPage = new QLabel(this);
//    m_pStackedWidget = new QStackedWidget(this);

//    pButton->setText(QStringLiteral("点击切换"));
//    pFirstPage->setText(QStringLiteral("一去丶二三里"));
//    pSecondPage->setText(QStringLiteral("青春不老，奋斗不止！"));
//    pThirdPage->setText(QStringLiteral("纯正开源之美，有趣、好玩、靠谱。。。"));

//    pFirstPage->move(10,100);
//    pSecondPage->move(10,100);
//    pThirdPage->move(10,100);
//    pButton->move(10,100);
//    // 添加页面（用于切换）
//    m_pStackedWidget->addWidget(pFirstPage);
//    m_pStackedWidget->addWidget(pSecondPage);
//    m_pStackedWidget->addWidget(pThirdPage);

//    m_pStackedWidget->move(10,200);

////    QVBoxLayout *pLayout = new QVBoxLayout();
////    pLayout->addWidget(pButton, 1, Qt::AlignRight | Qt::AlignVCenter);
////    pLayout->addWidget(m_pStackedWidget);
////    pLayout->setSpacing(10);
////    pLayout->setContentsMargins(10, 10, 10, 10);
////    setLayout(pLayout);

//    // 连接切换按钮信号与槽
//    connect(pButton, &QPushButton::clicked, this, &MainWindow::switchPage);

    QPushButton *pButton = new QPushButton(this);
    m_pStackedWidget = new QStackedWidget(this);

    pButton->setText(QStringLiteral("点击切换"));
    Dialog1 *dlg1 = new Dialog1(this);
    Dialog2 *dlg2 = new Dialog2(this);
    Dialog3 *dlg3 = new Dialog3(this);
    // 添加页面（用于切换）
    m_pStackedWidget->addWidget(dlg1);
    m_pStackedWidget->addWidget(dlg2);
    m_pStackedWidget->addWidget(dlg3);
    m_pStackedWidget->move(10,50);
    m_pStackedWidget->resize(200,200);

    connect(pButton,&QPushButton::clicked,this,&MainWindow::switchPage);

}

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

void MainWindow::switchPage()
{
    int count = m_pStackedWidget->count();
    int index = m_pStackedWidget->currentIndex();
    ++index;
    if(index >= count)
    {
        index = 0;
    }
    m_pStackedWidget->setCurrentIndex(index);
}