迁移《Qt教程一 —— 第三章：家庭价值》到Qt 4.3.0

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 http://www.qiliang.net/qt/tutorial1-03.html

/* ***************************************************************
**
** 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();
}