Qt 页面切换之 QStackedWidget

喜欢ヅ旅行 2022-05-26 06:21 341阅读 0赞

创建了3个widget 分别为FirstPage SecondPage ThirdPage  
每个页面嵌入一个label

#ifndef WIDGET_H
    #define WIDGET_H
    
    #include <QWidget>
    #include <QStackedWidget>
    
    namespace Ui {
    class Widget;
    }
    class StackedWidgetPrivate;
    class Widget : public QWidget
    {
        Q_OBJECT
    public:
        explicit Widget(QWidget *parent = 0);
        ~Widget();
    private:
        Ui::Widget *ui;
    private:
        StackedWidgetPrivate *m_pStackedWidget;
    private slots:
        void startSwitcher();
    };
    #endif // WIDGET_H

#include "widget.h"
    #include "ui_widget.h"
    #include <QPushButton>
    #include "secondpage.h"
    #include "thirdpage.h"
    #include "firstpage.h"
    #include <QVBoxLayout>
    #include <QLabel>
    #include <QMessageBox>
    class StackedWidgetPrivate{ 
    public:
        FirstPage *pageFirst;
        SecondPage *pageSecond;
        ThirdPage *pageThird;
        QStackedWidget *m_stackedWidget;
    };
    
    Widget::Widget(QWidget *parent) :
        QWidget(parent),
        ui(new Ui::Widget)
    {
        ui->setupUi(this);
        QSize size(400,400);
        this->resize(size);
        m_pStackedWidget = new StackedWidgetPrivate();
        m_pStackedWidget->pageSecond = new SecondPage(this);
        m_pStackedWidget->pageThird = new ThirdPage(this);
        m_pStackedWidget->pageFirst = new FirstPage(this);
    
        m_pStackedWidget->m_stackedWidget = new QStackedWidget();
        m_pStackedWidget->m_stackedWidget->insertWidget(0,m_pStackedWidget->pageFirst);
        m_pStackedWidget->m_stackedWidget->insertWidget(1,m_pStackedWidget->pageSecond);
        m_pStackedWidget->m_stackedWidget->insertWidget(2,m_pStackedWidget->pageThird);
    
        QLabel *label = new QLabel(this);
        label->setText("this is stackedWidget test");
    
        QPushButton *switcherBtn = new QPushButton(this);
        switcherBtn->setText("切换");
        connect(switcherBtn,SIGNAL(clicked(bool)),this,SLOT(startSwitcher()));
    
        QVBoxLayout *mainLayout = new QVBoxLayout(this);
        mainLayout->addWidget(label);
        mainLayout->addWidget(switcherBtn);
        mainLayout->addWidget(m_pStackedWidget->m_stackedWidget);
        setLayout(mainLayout);
    }
    
    Widget::~Widget()
    {
        delete ui;
    }
    //循环切换页面
    void Widget::startSwitcher()
    {
        int count = m_pStackedWidget->m_stackedWidget->count(); //页面总数
        int index = m_pStackedWidget->m_stackedWidget->currentIndex();//当前页面编号
        ++index;
        if(index>=count){
            index = 0;
        }
        m_pStackedWidget->m_stackedWidget->setCurrentIndex(index); //按页面编号跳转
    }

![这里写图片描述][70]  
这里只用到了  
insertWidget //在指定位置插入页面  
setCurrentIndex  
currentIndex  
count //总数  
3个 方法

还有其他方法  
int index= addWidget() //添加页面 返回序号  
QWidget\* currentIndex() //返回当前页面  
void removeWidget(QWidget\* widget) //移除，不是删除，只是隐藏起来了  
int index = indexOf(QWidget\* widget) //根据页面求编号

[70]: /images/20220526/48417df931294da8bc597f37f3094205.png