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Full Discussion: read position mouse cursor
Special Forums UNIX and Linux Applications read position mouse cursor Post 302254556 by daggilli on Tuesday 4th of November 2008 05:27:59 PM
Old 11-04-2008
Java
This is the complete code for a Qt application I threw together in about ten minutes (called crosshair) which displays the current mouse coordinates in a window. You might be able to pull enough out of it to be useful. This is Qt 3.1, but Qt 4 is not a great deal different. You will need the Qt development libraries, not just the runtimes. The code comprises two files, crosshair.h and crosshair.cpp.


crosshair.h:

Code:
#ifndef CROSSHAIR_H
#define CROSSHAIR_H
#include <qwidget.h>
#include <qstring.h>
#include <qlabel.h>
#include <qevent.h>

class Crosshair : public QLabel
{
Q_OBJECT

public:
    Crosshair(QWidget *parent=0);

protected:
    void mousePressEvent(QMouseEvent *);

private:
    QTimer         *timer;

private slots:
    void timerfire();
};

#endif

crosshair.cpp:

Code:
#include <qapplication.h>
#include <qpushbutton.h>
#include <qtimer.h>
#include <qcursor.h>
#include <iostream>
#include "crosshair.h"

using namespace std;

int main(int argc,char **argv)
{
    QApplication a(argc,argv);

    Crosshair mousepos;

    a.setMainWidget(&mousepos);
    mousepos.show();
    return a.exec();
}

Crosshair::Crosshair(QWidget *parent) : QLabel(parent)
{
    setIndent(20);
    resize(100,30);
    move(1200,200);
    setText("0,0");
    timer=new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(timerfire()));
    timer->start(50,false);
}

void Crosshair::mousePressEvent(QMouseEvent *)
{
    qApp->quit();
}

void Crosshair::timerfire()
{
    QPoint p=QCursor::pos();
    this->setText(QString().sprintf("%d,%d",p.x(),p.y()));
}

To build this, put both files in a directory called crosshair. cd to that directory and type
Code:
qmake -project
qmake
make

This does nothing more complex than inherit from a QLabel, set a timer to run 20x a second, grab the current cursor coordinates and write them into the label's text. Clicking in the window closes it. I use it for fixing up alignment bugs in JavaScript when I'm laying out objects.

You could open a file in the Crosshair class's constructor to store your data, and use gettimeofday(2) to get a timestamp. Nothing says Qt has to run in GUI mode (you can tell it explicitly not to in the QApplication constructor).

Qt from Trolltech: http://doc.trolltech.com
 

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LEARN ABOUT CENTOS

qsplashscreen

QSplashScreen(3qt)														QSplashScreen(3qt)

NAME

       QSplashScreen - Splash screen that can be shown during application startup

SYNOPSIS

       #include <qsplashscreen.h>

       Inherits QWidget.

   Public Members
       QSplashScreen ( const QPixmap & pixmap = QPixmap ( ), WFlags f = 0 )
       virtual ~QSplashScreen ()
       void setPixmap ( const QPixmap & pixmap )
       QPixmap * pixmap () const
       void finish ( QWidget * mainWin )
       void repaint ()

   Public Slots
       void message ( const QString & message, int alignment = AlignLeft, const QColor & color = black )
       void clear ()

   Signals
       void messageChanged ( const QString & message )

   Protected Members
       virtual void drawContents ( QPainter * painter )

DESCRIPTION

       The QSplashScreen widget provides a splash screen that can be shown during application startup.

       A splash screen is a widget that is usually displayed when an application is being started. Splash screens are often used for applications
       that have long start up times (e.g. database or networking applications that take time to establish connections) to provide the user with
       feedback that the application is loading.

       The splash screen appears centered on the screen. It may be useful to add the WStyle_StaysOnTop if you desire to keep above all the windows
       in the GUI.

       Some X11 window managers do not support the "stays on top" flag. A solution is to set up a timer that periodically calls raise() on the
       splash screen to simulate the "stays on top" effect.

       The most common usage is to show a splash screen before the main widget is displayed on the screen. This is illustrated in the following
       code snippet.

	  int main( int argc, char **argv )
	  {
	      QApplication app( argc, argv );
	      QPixmap pixmap( "splash.png" );
	      QSplashScreen *splash = new QSplashScreen( pixmap );
	      splash->show();
	      QMainWindow *mainWin = new QMainWindow;
	      ...
	      app.setMainWidget( mainWin );
	      mainWin->show();
	      splash->finish( mainWin );
	      delete splash;
	      return app.exec();
	  }

       It is sometimes useful to update the splash screen with messages, for example, announcing connections established or modules loaded as the
       application starts up. QSplashScreen supports this with the message() function. If you wish to do your own drawing you can get a pointer to
       the pixmap used in the splash screen with pixmap(). Alternatively, you can subclass QSplashScreen and reimplement drawContents().

       The user can hide the splash screen by clicking on it with the mouse. Since the splash screen is typically displayed before the event loop
       has started running, it is necessary to periodically call QApplication::processEvents() to receive the mouse clicks.

	  QPixmap pixmap( "splash.png" );
	  QSplashScreen *splash = new QSplashScreen( pixmap );
	  splash->show();
	  ... // Loading some items
	  splash->message( "Loaded modules" );
	  qApp->processEvents();
	  ... // Establishing connections
	  splash->message( "Established connections" );
	  qApp->processEvents();

       See also Miscellaneous Classes.

MEMBER FUNCTION DOCUMENTATION

QSplashScreen::QSplashScreen ( const QPixmap & pixmap = QPixmap ( ), WFlags f = 0 )
       Construct a splash screen that will display the pixmap.

       There should be no need to set the widget flags, f, except perhaps WDestructiveClose or WStyle_StaysOnTop.

QSplashScreen::~QSplashScreen () [virtual]
       Destructor.

void QSplashScreen::clear () [slot]
       Removes the message being displayed on the splash screen

       See also message().

void QSplashScreen::drawContents ( QPainter * painter ) [virtual protected]
       Draw the contents of the splash screen using painter painter. The default implementation draws the message passed by message(). Reimplement
       this function if you want to do your own drawing on the splash screen.

void QSplashScreen::finish ( QWidget * mainWin )
       Makes the splash screen wait until the widget mainWin is displayed before calling close() on itself.

void QSplashScreen::message ( const QString & message, int alignment = AlignLeft, const QColor & color = black ) [slot]
       Draws the message text onto the splash screen with color color and aligns the text according to the flags in alignment.

       See also Qt::AlignmentFlags and clear().

void QSplashScreen::messageChanged ( const QString & message ) [signal]
       This signal is emitted when the message on the splash screen changes. message is the new message and is a null-string when the message has
       been removed.

       See also message() and clear().

QPixmap * QSplashScreen::pixmap () const
       Returns the pixmap that is used in the splash screen. The image does not have any of the text drawn by message() calls.

void QSplashScreen::repaint ()
       This overrides QWidget::repaint(). It differs from the standard repaint function in that it also calls QApplication::flush() to ensure the
       updates are displayed, even when there is no event loop present.

void QSplashScreen::setPixmap ( const QPixmap & pixmap )
       Sets the pixmap that will be used as the splash screen's image to pixmap.

SEE ALSO

       http://doc.trolltech.com/qsplashscreen.html http://www.trolltech.com/faq/tech.html

COPYRIGHT

       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the license file included in the distribution for a complete license
       statement.

AUTHOR

       Generated automatically from the source code.

BUGS

       If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html.  Good bug reports help us to help you.
       Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a
       web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially
       supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.  Please include the name of the manual page
       (qsplashscreen.3qt) and the Qt version (3.3.8).

Trolltech AS							  2 February 2007						QSplashScreen(3qt)
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