qthread, qcustomevent and qprogressbar

Hi,

I am trying to update a progressbar in a main widget from a job run from a qthread via a custom event.

The objective is to ensure the progress bar is updated as the "long job" is running. At the moment if I just run job from the main class the gui just freezes until the job is complete. I think threading it is the best of option for "real time" update of the qprogressbar. See my code below of a simple example of what I am trying to do. I do not think the thread is emitting the event correctly (i just get cout of thread and not event !!), I think the problem may be with the qobject receiver in the postevet, qApp.

Any suggestions or help would be great, its very frustating as I feel I am close to a solution.

main.cpp

Code:

---

/*
* external loop main.cpp 
*/
#include "externalloop.h"
#include <qapplication.h>
 
int main( int argc, char **argv )
{
    QApplication a( argc, argv );
 
    ExternalLoop externalloop;
    externalloop.resize( 200, 100 );
    externalloop.setCaption( "ExternalLoop" );
    a.setMainWidget( &externalloop );
    externalloop.show();
 
    return a.exec();
 
}

---

extarnalloop.h

Code:

---

/*
* externalloop.h
*/
#ifndef GREY_BUTTON_H
#define GREY_BUTTON_H
 
#include <qwidget.h>
#include <qpushbutton.h>
#include <qprogressbar.h>
#include <qapplication.h>
#include <qlayout.h>
#include <qevent.h>
#include <qthread.h>
#include <iostream>
 
class QProgressBar;
class QPushButton;
 
class ExternalLoop : public QWidget
 
{
    Q_OBJECT
 
public:
    ExternalLoop( QWidget *parent = 0, const char *name = 0 );
    QPushButton *pb1;
    QProgressBar *myProgress;
    void customEvent(QCustomEvent * e);
 
 
private:
 
public slots:
	void theLoop();
 
};
 
class myEvent : public QCustomEvent
{
 
	public:
 
    myEvent(int i): QCustomEvent( QEvent::User ),v(i){};
    int done() const { return v; };
 
	private:
    int v;
 
 
};
 
class MyThread : public QThread {
 
    public:
 
        virtual void run();
 
};
 
#endif

---

externalloop.cpp

Code:

---

/*
* externalloop.cpp
*/
#include "externalloop.h"
 
using namespace std;
 
ExternalLoop::ExternalLoop( QWidget *parent, const char *name )
    : QWidget( parent, name )
{
 
 
    QGridLayout *grid1 = new QGridLayout(this,2,1,10);
 
    pb1 = new QPushButton("Loop", this); 
    grid1->addWidget( pb1, 0, 0 );
    connect(pb1, SIGNAL( clicked() ), this, SLOT( theLoop() ) );
 
    myProgress = new QProgressBar(100, this);
    grid1->addWidget( myProgress, 1, 0);    
 
    myProgress->setTotalSteps(10);
 
 
}
void ExternalLoop::theLoop()
{
 
	MyThread a;
	a.start();
    a.wait();
 
 
}
 
void ExternalLoop::customEvent(QCustomEvent * e)
{
 
	myEvent* lEvent = (myEvent*)e;
	int var = lEvent->done();
	myProgress->setProgress(var);
	qApp->processEvents();
	cout << "event " << var << endl;
 
}
 
void MyThread::run()
{
 
        for( int count = 0; count < 11; count++ ) {
            sleep( 1 );
            cout << "thread " << count << endl;
            myEvent* lEvent = new myEvent(count);
            QApplication::postEvent( qApp, lEvent);
 
        }
}

---