HelloQT

この時間はちょうどQTを学ぶことを始めて、学習の経歴を記録します:以下はQT版のHelloWorldです:
//ファイル1 helloqt.h
#ifndef HELLOQT_H

#define HELLOQT_H

 
  
#include<QWidget>
  
#include<QPaintEvent>
  
 
  
class HelloQT : public QWidget
  
{
  
public:
  
    HelloQT(QWidget *parent = 0);
  
    ~HelloQT();
  
protected:
  
    void paintEvent(QPaintEvent *event);
  
};
  
 
  
 
  
#endif // HELLOQT_H
  

  
//  2 helloqt.cpp
  
#include<QtGui>
#include"HelloQT.h"
 

HelloQT::HelloQT(QWidget *parent) : QWidget(parent)
 
{
 
    QPalette palette;
 
    palette.setBrush(backgroundRole(), QBrush(Qt::white));
 
    setPalette(palette);
 
}
 

HelloQT::~HelloQT()
 
{
 
}
 

void HelloQT::paintEvent(QPaintEvent *event)
 
{
 
    QRect rect = event->rect();
 
    QPainter painter(this);
 
    painter.drawText(rect, Qt::AlignCenter, QObject::tr("Hello, QT"));
 
}
  

  
//  3 main.cpp
  
#include <QApplication> 
#include"HelloQT.h"
   
 
int main(int argc, char **argv)
   
{
   
 QApplication app(argc, argv);
   
 HelloQT w;
   
 w.show();
   
 return app.exec();
   
}
  
//  4 helloqt.pro
  
SOURCES += \
    HelloQT.cpp \
 
    main.cpp
 
HEADERS += \
 
    HelloQT.h
  

  
 QtCreator     ，         ，
  
        Windows      HelloWorld      。