迁移《Qt教程一 —— 第三章：家庭价值》到Qt 4.3.0

Qt 3.0的是这样子的

/****************************************************************
**
** Qt教程一 - 3
**
****************************************************************/

#include <qapplication.h>
#include <qpushbutton.h>
#include <qfont.h>
#include <qvbox.h>

int main( int argc, char **argv )
{
    QApplication a( argc, argv );

    QVBox box;
    box.resize( 200, 120 );

    QPushButton quit( "Quit", &box );
    quit.setFont( QFont( "Times", 18, QFont::Bold ) );

    QObject::connect( &quit, SIGNAL(clicked()), &a, SLOT(quit()) );

    a.setMainWidget( &box );
    box.show();

    return a.exec();
}

在4.3中已经没有QVBox这个类了

---

QVBox

The QVBox class is now only available as Q3VBox in Qt 4. You can achieve the same result as QVBox by creating a QWidget with a vertical layout:

For example, if you have code like

 QVBox *vbox = new QVBox;

 QPushButton *child1 = new QPushButton(vbox);

 QPushButton *child2 = new QPushButton(vbox); 

you can rewrite it as

 QWidget *vbox = new QWidget;

 QPushButton *child1 = new QPushButton;

 QPushButton *child2 = new QPushButton;

 QVBoxLayout *layout = new QVBoxLayout;

 layout->addWidget(child1);

 layout->addWidget(child2);

 vbox->setLayout(layout); 

Note that child widgets are not automatically placed into the widget's layout; you will need to manually add each widget to the QVBoxLayout.

---

我写的：

/****************************************************************
**
** Qt教程一 - 3
**
****************************************************************/

#include <qapplication.h>
#include <qpushbutton.h>
#include <qfont.h>
#include <qboxlayout.h>

int main( int argc, char **argv )
{
    QApplication a( argc, argv );

    QWidget window;
    window.resize(200,120);

    QVBoxLayout layout;
    QPushButton quit( "Quit", &window );
    quit.setFont( QFont( "Times", 18, QFont::Bold ) );
    QObject::connect( &quit, SIGNAL(clicked()), &a, SLOT(quit()) );

    layout.addWidget(&quit);
    
    window.setLayout(&layout);
    window.show();

    return a.exec();
}