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#include <QApplication>
#include <mainwindow.h>
int main(int argc, char * argv[])
{	
	QApplication app(argc,argv);
	MainWindow mainWin;
       mainWin.show();	
	return app.exec();
}

Code: Alles auswählen

#include <QObject>
class Singleton : public QObject
{ 
  Q_OBJECT; 
public: 
  // Methods to handle singleton instance. 
  static Singleton* getInstance(); ///< Get singleton instance. Create instance if necessary. 
  static bool hasInstance();            ///< Check if the singleton has an instance. 
  void destroyInstance();               ///< Destroy the instance of the singleton 
  void MethodToCall(); 
private: 
  Singleton();
  ~Singleton();
  /// Member to hold the singleton instance. 
  static Singleton * _instance; 
signals: 
  void emittedSignal(); 
};

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#include "Singleton.h" 
Singleton * Singleton::_instance = 0; 
Singleton:: Singleton() { 
} 
Singleton::~ Singleton() { 
} 
Singleton * Singleton::getInstance() { 
  if(_instance==0) 
  { 
    _instance = new Singleton; 
  } 
  return _instance; 
}
bool Singleton::hasInstance() { 
  return _instance!=0; 
} 
void Singleton::destroyInstance(){ 
 delete _instance; 
 _instance=NULL; 
} 
void Singleton::MethodToCall() { 
  emit this->emittedSignal(); 
} 

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
class Singleton;
class MainWindow : public QMainWindow
{
	Q_OBJECT
	
	public:
		MainWindow();
		~MainWindow();
		
	private:
				
    Singleton * m_singleton;      	
                          			
	private slots:
    void emitSignal();	
};
#endif

Code: Alles auswählen

#include <QTGui>
#include <QPushButton>
#include "mainwindow.h"
#include "Singleton.h"
#include "Reciever.h"

MainWindow::MainWindow(){
	setWindowTitle(tr("SINGLETON EMIT TEST"));
  m_singleton = Singleton::getInstance();
  QWidget *w =new QWidget(this);
  setCentralWidget(w);
  QPushButton * testButton = new QPushButton("Emit Signal" ,this);
  QVBoxLayout * mainLayout = new QVBoxLayout(this);
  mainLayout->addWidget(testButton);
  
  connect(testButton, SIGNAL(clicked()), this, SLOT(emitSignal()));

  Reciever * rec = new Reciever(this);
  mainLayout->addWidget(rec);
  w->setLayout(mainLayout);
}

MainWindow::~MainWindow(){
	m_singleton->destroyInstance();
}

void MainWindow::emitSignal(){
  m_singleton->MethodToCall();
}

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#ifndef RECIEVER_H
#define RECIEVER_H
#include <QWidget>
class Singleton; 
class QLabel;
class Reciever : public QWidget 
{ Q_OBJECT
  public: 
    Reciever(QWidget *i_parent); 
    ~Reciever(); 
  private: 
    Singleton * m_singleton;    
    QLabel * m_msgLabel;      
  public slots: 
    void recieverSlot(); 
}; 
#endif

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#include <QTGui>
#include "Singleton.h" 
#include "Reciever.h" 

Reciever::Reciever(QWidget *i_parent)
: QWidget(i_parent),
  m_singleton(NULL),
  m_msgLabel(NULL)
{ 
   m_singleton = Singleton::getInstance(); 
   connect(m_singleton, SIGNAL(emittedSignal()),this,SLOT(recieverSlot())); 
   m_msgLabel = new QLabel("wait",this);
} 

Reciever::~Reciever() { 
} 

void Reciever::recieverSlot() { 
  m_msgLabel->setText("CONNECTED");
}