qt学习笔记可扩展对话框

mainLayout->setSizeConstraint(QLayout::SetFixedSize);
设置窗体的大小固定，不能经过拖动改变大小

extension.h#ifndef EXTENSION_H#define EXTENSION_H#include <QDialog>#include <QLabel>#include <QLineEdit>#include <QPushButton>#include <QComboBox>#include <QGridLayout>class Extension : public QDialog{    Q_OBJECTpublic:    Extension(QWidget *parent = 0);    ~Extension();    void createBaseWidget();    void createDetailWidget();private:    QWidget *baseWidget;    QWidget *detailWidget;    /*  base  */    QLabel *nameLabel;    QLabel *sexLabel;    QLineEdit *nameLineEdit;    QComboBox *sexComBox;    QPushButton *okBtn;    QPushButton *detailBtn;    /*  detail  */    QLabel *ageLabel;    QLineEdit *ageLineEdit;    QLabel *departmentLabel;    QComboBox *departmentComboBox;    QLabel *emailLabel;    QLineEdit *emailLineEdit;private slots:    void slotExtension();};#endif // EXTENSION_H

extension.cpp#include "extension.h"Extension::Extension(QWidget *parent)    : QDialog(parent){    createBaseWidget();    createDetailWidget();    setWindowTitle(tr("可扩展对话框"));    QVBoxLayout *mainLayout = new QVBoxLayout;    mainLayout->addWidget(baseWidget);    mainLayout->addWidget(detailWidget);    mainLayout->setSizeConstraint(QLayout::SetFixedSize);    this->setLayout(mainLayout);    connect(detailBtn, SIGNAL(clicked()), this, SLOT(slotExtension()));}void Extension::createBaseWidget(){    nameLabel = new QLabel(tr("姓名"));    nameLineEdit = new QLineEdit;    okBtn = new QPushButton(tr("确定"));    sexLabel = new QLabel(tr("性别"));    sexComBox = new QComboBox;    sexComBox->addItem(tr("男"));    sexComBox->addItem(tr("女"));    detailBtn = new QPushButton(tr("详细"));    QGridLayout *baseLayout = new QGridLayout;    baseLayout->addWidget(nameLabel, 0, 0);    baseLayout->addWidget(nameLineEdit, 0, 1);    baseLayout->addWidget(okBtn, 0, 2);    baseLayout->addWidget(sexLabel, 1, 0);    baseLayout->addWidget(sexComBox, 1, 1);    baseLayout->addWidget(detailBtn, 1, 2);    baseWidget = new QWidget;    baseWidget->setLayout(baseLayout);}void Extension::createDetailWidget(){    ageLabel = new QLabel(tr("姓名"));    ageLineEdit = new QLineEdit;    departmentLabel = new QLabel(tr("部门"));    departmentComboBox = new QComboBox;    departmentComboBox->addItem(tr("部门1"));    departmentComboBox->addItem(tr("部门2"));    departmentComboBox->addItem(tr("部门3"));    emailLabel = new QLabel(tr("email"));    emailLineEdit = new QLineEdit;    QGridLayout *detailLayout = new QGridLayout;    detailLayout->addWidget(ageLabel, 0, 0);    detailLayout->addWidget(ageLineEdit, 0, 1);    detailLayout->addWidget(departmentLabel, 1, 0);    detailLayout->addWidget(departmentComboBox, 1, 1);    detailLayout->addWidget(emailLabel, 2, 0);    detailLayout->addWidget(emailLineEdit, 2, 1);    detailWidget = new QWidget;    detailWidget->setLayout(detailLayout);}void Extension::slotExtension(){    if(detailWidget->isHidden())        detailWidget->show();    else        detailWidget->hide();}Extension::~Extension(){}

main.cpp

include “extension.h”

include

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Extension w;
w.show();

return a.exec();

}