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Source code

class Renderer : public QWidget
{
	Q_OBJECT

public:
	Renderer(QWidget *parent);
	QSize sizeHint() const;
	QSize minimumSizeHint() const;

protected:
	void paintEvent(QPaintEvent *event);
	void mousePressEvent(QMouseEvent *event);
	void mouseReleaseEvent(QMouseEvent *event);
	bool event(QEvent *);
};

Source code

Renderer::Renderer(QWidget *parent)
	:QWidget(parent)
{
	//connect(this, SIGNAL())
}

bool Renderer::event(QEvent *event)
{
	if(event->type() == QEvent::MouseButtonPress)
	{
    	QMouseEvent* mouse_event = (QMouseEvent*)event;
    	if(mouse_event->button() == Qt::LeftButton)
    	{
        	cout << "\nLeft button pressed" << endl;
        	return true;
    	}
    	else if(mouse_event->button() == Qt::RightButton)
    	{
        	cout << "\nRight button pressed" << endl;
        	return true;
    	}

	}
	if(event->type() == QEvent::MouseButtonRelease)
	{
    	QMouseEvent* mouse_event = (QMouseEvent*)event;
    	if(mouse_event->button() == Qt::LeftButton)
    	{
        	cout << "\nLeft button released" << endl;
        	return true;
    	}
    	else if(mouse_event->button() == Qt::RightButton)
    	{
        	cout << "\nRight button released" << endl;
        	return true;
    	}
    	//mouseReleaseEvent(qobject_cast<QMouseEvent*>(event));
    	mouseReleaseEvent(mouse_event);
    	return true;
	}
	return false;
}

void Renderer::paintEvent(QPaintEvent *event)
{
	//cout << "Now in PaintEvent" << endl;
	int side = qMin(width(),height());
	QPainter paint(this);
	paint.setWindow(-50,-50,100,100);
	//paint.setViewport(-50,-50,100,100);
	paint.setViewport(width()-side,height()-side,side,side);
	QRect win = paint.window();
	//paint.drawRect(win.x()+1,win.y()+1,win.width()-win.x()-2,
             	//  win.height()-win.y()-2);
	//paint.drawLine(0,-50,50,50);
	paint.setBrush(Qt::white);
	paint.drawEllipse(QPoint(0,0),49,49);
	paint.drawLine(QPoint(0,0),QPoint(50,50));
	cout << win.width() << " " << win.height() << endl;

}

void Renderer::mousePressEvent(QMouseEvent *event)
{
	if(event->button() == Qt::LeftButton)
	{
    	QPoint pos = event->pos();
    	cout << "\nInside mousePressEvent (Left button)";
    	cout << "\nx,y" << pos.x() << " " << pos.y() << endl;

	}
	else if(event->button() == Qt::RightButton)
	{
    	cout << "\nInside mousePressEvent (Right button)" << endl;
	}
}

void Renderer::mouseReleaseEvent(QMouseEvent *event)
{
	cout << "\nNow inside Mouserealese" << endl;
}

QSize Renderer::sizeHint() const
{
	return QSize(100,100);
}

QSize Renderer::minimumSizeHint() const
{
	return QSize(100,100);
}

Source code

	if(event->type() == QEvent:Paint)
	{
    	QPaintEvent* paint_event = (QPaintEvent*)event;
    	paintEvent(paint_event);
    	return true;
	}