extension.h

#ifndef EXTESION_H#define EXTESION_H#include 
     
      #include "ui_extesion.h"class Extesion : public QDialog{	Q_OBJECTpublic:	Extesion(QWidget *parent = 0, Qt::WFlags flags = 0);	~Extesion();private:	Ui::ExtesionClass ui;	void creatBaseInfo();	void creatDetailInfo();	QWidget *baseWidget;	QWidget *detailWidget;	private slots:		void slotExtension();};#endif // EXTESION_H
     

extemsion.cpp

#include "extesion.h"Extesion::Extesion(QWidget *parent, Qt::WFlags flags)	: QDialog(parent, flags){	ui.setupUi(this);	setWindowTitle(tr("Window Extension"));	creatBaseInfo();    creatDetailInfo();		QVBoxLayout *layout = new QVBoxLayout;    layout->addWidget(baseWidget);     layout->addWidget(detailWidget);	//注意下面这一行	//保证对话框的尺寸相对固定始终是各控件组合的尺寸	layout->setSizeConstraint(QLayout::SetFixedSize);    layout->setSpacing(10);    setLayout(layout);}Extesion::~Extesion(){}void Extesion::creatBaseInfo(){	baseWidget=new QWidget();	QLabel *nameLabel=new QLabel(tr("Name"));	QLineEdit *nameLineEdit=new QLineEdit();	nameLineEdit->setText("12");	QLabel *sexlabel=new QLabel(tr("Sex"));	QComboBox *combox=new QComboBox();	combox->addItem(tr("Male"));	combox->addItem(tr("Female"));	QPushButton *okButton=new QPushButton(tr("Ok"));	QPushButton *detailButton=new QPushButton(tr("Detail"));	connect(detailButton,SIGNAL(clicked()),this,SLOT(slotExtension()));	QDialogButtonBox *buttonBox=new QDialogButtonBox(Qt::Vertical);	buttonBox->addButton(okButton,QDialogButtonBox::ActionRole);	buttonBox->addButton(detailButton,QDialogButtonBox::ActionRole);	QGridLayout *Glayout=new QGridLayout();	Glayout->addWidget(nameLabel,0,0);	Glayout->addWidget(nameLineEdit,0,1);	Glayout->addWidget(sexlabel,1,0);	Glayout->addWidget(combox,1,1);	QHBoxLayout *hLayout=new QHBoxLayout();	hLayout->addLayout(Glayout);	hLayout->addStretch();	hLayout->addWidget(buttonBox);	baseWidget->setLayout(hLayout);}void Extesion::creatDetailInfo(){	detailWidget = new QWidget;	QLabel *label1 = new QLabel(tr("Age:"));	QLineEdit *ageEdit = new QLineEdit;	ageEdit->setText("30");	QLabel *label2 = new QLabel(tr("Department:"));	QComboBox *deptComboBox = new QComboBox;	deptComboBox->addItem(tr("dept 1"));	deptComboBox->addItem(tr("dept 2"));	deptComboBox->addItem(tr("dept 3"));	deptComboBox->addItem(tr("dept 4"));	QLabel *label3 = new QLabel(tr("email:"));	QLineEdit *edit = new QLineEdit;	QGridLayout *grid = new QGridLayout;	grid->addWidget(label1,0,0);	grid->addWidget(ageEdit,0,1);	grid->addWidget(label2,1,0);	grid->addWidget(deptComboBox,1,1);	grid->addWidget(label3,2,0);	grid->addWidget(edit,2,1);	detailWidget->setLayout(grid);	detailWidget->hide();}void Extesion::slotExtension(){	if(detailWidget->isHidden()){		detailWidget->show();	}else{		detailWidget->hide();	}}

main.cpp

#include "extesion.h"#include 
     
      int main(int argc, char *argv[]){	QApplication a(argc, argv);	Extesion *w=new Extesion();	w->show();	return a.exec();}