Russian Qt Forum

QApplication app(argc, argv);    
QWidget win; 
QPainter pip;
pip.begin(&win);
pip.setBrush(QBrush(Qt::red,Qt::DiagCrossPattern));
pip.setPen(QPen(Qt::blue,3,Qt::DashLine));
pip.drawRect((QRect(10,10,30,30)));
pip.end();
win.show();

class Window : public QLabel {

Q_OBJECT

private:
    QPoint  m_ptPosition;

protected:
    virtual void Window::mousePressEvent(QMouseEvent* pe)
    {
        m_ptPosition = pe->pos();
    }

    virtual void Window::mouseMoveEvent(QMouseEvent* pe)
    {
        move(pe->globalPos() - m_ptPosition);
    }
	virtual void  keyPressEvent(QKeyEvent* e);


public:
    Window(QWidget* pwgt = 0)
		: QLabel(pwgt,Qt::FramelessWindowHint | Qt::Window) 
    {
    }

void paintEvent( QPaintEvent * );


};

void Window::paintEvent( QPaintEvent * e)
{	QPainter pip;
    	pip.begin(this);
	pip.drawPixmap(0,0,QPixmap("img/screen.png"));
	pip.setBrush(QBrush(Qt::red,Qt::DiagCrossPattern));
	pip.setPen(QPen(Qt::blue,3,Qt::DashLine));
	pip.drawRect((QRect(10,10,30,30)));
	pip.end();
}

void Window::keyPressEvent(QKeyEvent* e);
{	if(e->key()==Key_Return) exit(0);
}

{	QPainter pip;
    	pip.begin(this);
//...
	pip.end();

{	QPainter pip(this);
//...

#include <qapplication.h>
#include<qpixmap.h>
#include <qlabel.h>
#include <QMouseEvent>
#include<qwidget.h>
#include<qbitmap>
#include <qpainter.h>
class Window : public QLabel {

Q_OBJECT

private:
    QPoint  m_ptPosition;

protected:
    virtual void Window::mousePressEvent(QMouseEvent* pe)
    {
        m_ptPosition = pe->pos();
    }

    virtual void Window::mouseMoveEvent(QMouseEvent* pe)
    {
        move(pe->globalPos() - m_ptPosition);
    }
	


public:
    Window(QWidget* pwgt = 0)
		: QLabel(pwgt,Qt::FramelessWindowHint | Qt::Window) 
    {
    }

void paintEvent( QPaintEvent * );
void  keyPressEvent(QKeyEvent* e);

};

void Window::paintEvent( QPaintEvent * )
{	QPainter pip;
    	pip.begin(this);
	pip.drawPixmap(0,0,QPixmap("img/screen.png"));
	pip.setBrush(QBrush(Qt::red,Qt::DiagCrossPattern));
	pip.setPen(QPen(Qt::blue,3,Qt::DashLine));
	pip.drawRect((QRect(10,10,30,30)));
	pip.end();
}

void Window::keyPressEvent(QKeyEvent* e)
{	if(e->key()==Qt::Key_Return) exit(0);
}



// ----------------------------------------------------------------------
int main(int argc, char** argv)
{ QApplication app(argc, argv);    
	Window win;
		QPixmap pix("img/screen.png");
    win.setPixmap(pix);
	win.setMask(pix.mask());
		win.show();
	


    return app.exec();
}