QStackedWidget类继承于QFrame类，用于堆栈窗体的管理。

Public Slots：

void setCurrentIndex( int index )            index参数的索引位置的部件，是可见的。（index默认为-1，表示堆栈为空）

void setCurrentWidget( QWidget * widget )        widget参数指定的部件，是可见的。

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实现效果:

maindlg.h

#ifndef MAINDLG_H#define MAINDLG_H#include 
     
      class MainDlg : public QDialog{	Q_OBJECTpublic:	MainDlg(QWidget *parent = 0, Qt::WFlags flags = 0);	~MainDlg();private:	QLabel *lab1;	QLabel *lab2;	QLabel *lab3;	QListWidget *m_list;	QStackedWidget *stack;};#endif // MAINDLG_H
     

maindlg.cpp

#include "maindlg.h"MainDlg::MainDlg(QWidget *parent, Qt::WFlags flags)	: QDialog(parent, flags){	setWindowTitle(tr("Stacked Widgets example"));	//左部的列表框：	m_list = new QListWidget;	m_list->insertItem(0,tr("Window 1"));	m_list->insertItem(1,tr("Window 2"));	m_list->insertItem(2,tr("Window 3"));	//右部的堆栈窗：	stack = new QStackedWidget(this);	lab1 = new QLabel(tr("This is window 1"));	stack->addWidget(lab1);	lab2 = new QLabel(tr("This is window 2"));	stack->addWidget(lab2);	lab3 = new QLabel(tr("This is window 3"));	stack->addWidget(lab3);		//布局；	QHBoxLayout *mainLayout = new QHBoxLayout(this);	mainLayout->addWidget(m_list);	mainLayout->addWidget(stack,0,Qt::AlignHCenter);	mainLayout->setMargin(5);	mainLayout->setSpacing(5);	mainLayout->setStretchFactor(m_list,1);	mainLayout->setStretchFactor(stack,3);	connect(m_list,SIGNAL(currentRowChanged(int)),stack,SLOT(setCurrentIndex(int)));}MainDlg::~MainDlg(){}

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