#include <QWidget>
#include <QGridLayout>

namespace Ui {
class ViewForm;
}

class ViewForm : public QWidget
{
    Q_OBJECT
    
public:
    explicit ViewForm(QWidget *parent = 0);
    ~ViewForm();
    
private slots:
     void on_pushbutton_clicked();

private:
    Ui::ViewForm *ui;
//    QWidget *sub ;
     QMovie *movie;
     bool moviestatus;

};

#include "ui_viewform.h"
#include <QGridLayout.h>
#include<QLabel>
#include<QPixmap>
#include<QMovie>
#include<QPushButton>

ViewForm::ViewForm(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ViewForm)
{
    ui->setupUi(this);
    movie =new QMovie("E:/Codes/QtTest/images/hiahia.gif");
    moviestatus = false;
    ui->label->setMovie(movie);
    ui->label->show();
    ui->pushbutton->setText("开始，嘿嘿");
}

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


void ViewForm::on_pushbutton_clicked()
{
        if(!moviestatus)
       {
            ui->pushbutton->setText("歇会，呼呼");
           movie->start();
           moviestatus = true;
       }
       else
       {
            ui->pushbutton->setText("继续，嘻嘻");
           moviestatus = false;
           movie->stop();
       }
}

以上为子框架ViewForm.h与ViewForm.cpp的代码

下面为运行进入主框架代码：

Mainform.h代码

#ifndef MAINFORM_H
#define MAINFORM_H

#include <QWidget>
#include<QtGui>
#include<QGridLayout>
#include "viewform.h"

class MainForm : public QWidget
{
    Q_OBJECT
    
public:
    explicit MainForm(QWidget *parent = 0);
    ~MainForm();
    
private:
    ViewForm* viewWidget;

private slots:
    void viewChange();

};

#endif // MAINFORM_H

MainForm.cpp的代码

#include "mainform.h"


MainForm::MainForm(QWidget *parent) :
    QWidget(parent)
{

    QPushButton * view = new QPushButton("视频切换");
    QGridLayout * glout = new QGridLayout;
    this->setGeometry(QRect(0,0,400,300));
    QDesktopWidget* desktop = QApplication::desktop(); // =qApp->desktop();也可以
    move((desktop->width() - this->width())/2, (desktop->height() - this->height())/2);
    //    glout->setGeometry(QRect(10,10,10,10));
    glout->addWidget(view);
    connect(view,SIGNAL(clicked()),this,SLOT(viewChange()));
    setLayout(glout);

}

MainForm::~MainForm()
{

}

void MainForm::viewChange()
{
    viewWidget = new ViewForm;
    viewWidget->setWindowTitle("视频");
    viewWidget->show();

}