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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 REDHAT

qtimerevent

QTimerEvent(3qt)														  QTimerEvent(3qt)

NAME

       QTimerEvent - Parameters that describe a timer event

SYNOPSIS

       #include <qevent.h>

       Inherits QEvent.

   Public Members
       QTimerEvent ( int timerId )
       int timerId () const

DESCRIPTION

       The QTimerEvent class contains parameters that describe a timer event.

       Timer events are sent at regular intervals to objects that have started one or more timers. Each timer has a unique identifier. A timer is
       started with QObject::startTimer().

       The QTimer class provides a high-level programming interface that uses signals instead of events. It also provides one-shot timers.

       The event handler QObject::timerEvent() receives timer events.

       See also QTimer, QObject::timerEvent(), QObject::startTimer(), QObject::killTimer(), QObject::killTimers(), and Event Classes.

MEMBER FUNCTION DOCUMENTATION

QTimerEvent::QTimerEvent ( int timerId )
       Constructs a timer event object with the timer identifier set to timerId.

int QTimerEvent::timerId () const
       Returns the unique timer identifier, which is the same identifier as returned from QObject::startTimer().

       Example: dclock/dclock.cpp.

SEE ALSO

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

COPYRIGHT

       Copyright 1992-2001 Trolltech AS, 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
       (qtimerevent.3qt) and the Qt version (3.1.1).

Trolltech AS							  9 December 2002						  QTimerEvent(3qt)
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