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This example displays a digital LCD clock that can switch between time and date.
Header file:
/****************************************************************************
** $Id: qt/dclock.h 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef DCLOCK_H
#define DCLOCK_H
#include <ntqlcdnumber.h>
class DigitalClock : public TQLCDNumber // digital clock widget
{
TQ_OBJECT
public:
DigitalClock( TQWidget *parent=0, const char *name=0 );
protected: // event handlers
void timerEvent( TQTimerEvent * );
void mousePressEvent( TQMouseEvent * );
private slots: // internal slots
void stopDate();
void showTime();
private: // internal data
void showDate();
bool showingColon;
int normalTimer;
int showDateTimer;
};
#endif // DCLOCK_H
Implementation:
/****************************************************************************
** $Id: qt/dclock.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "dclock.h"
#include <ntqdatetime.h>
//
// Constructs a DigitalClock widget with a parent and a name.
//
DigitalClock::DigitalClock( TQWidget *parent, const char *name )
: TQLCDNumber( parent, name )
{
showingColon = FALSE;
setFrameStyle( TQFrame::Panel | TQFrame::Raised );
setLineWidth( 2 ); // set frame line width
showTime(); // display the current time
normalTimer = startTimer( 500 ); // 1/2 second timer events
showDateTimer = -1; // not showing date
}
//
// Handles timer events for the digital clock widget.
// There are two different timers; one timer for updating the clock
// and another one for switching back from date mode to time mode.
//
void DigitalClock::timerEvent( TQTimerEvent *e )
{
if ( e->timerId() == showDateTimer ) // stop showing date
stopDate();
else { // normal timer
if ( showDateTimer == -1 ) // not showing date
showTime();
}
}
//
// Enters date mode when the left mouse button is pressed.
//
void DigitalClock::mousePressEvent( TQMouseEvent *e )
{
if ( e->button() == TQMouseEvent::LeftButton ) // left button pressed
showDate();
}
//
// Shows the current date in the internal lcd widget.
// Fires a timer to stop showing the date.
//
void DigitalClock::showDate()
{
if ( showDateTimer != -1 ) // already showing date
return;
TQDate date = TQDate::currentDate();
TQString s;
s.sprintf( "%2d %2d", date.month(), date.day() );
display( s ); // sets the LCD number/text
showDateTimer = startTimer( 2000 ); // keep this state for 2 secs
}
//
// Stops showing the date.
//
void DigitalClock::stopDate()
{
killTimer( showDateTimer );
showDateTimer = -1;
showTime();
}
//
// Shows the current time in the internal lcd widget.
//
void DigitalClock::showTime()
{
showingColon = !showingColon; // toggle/blink colon
TQString s = TQTime::currentTime().toString().left(5);
if ( !showingColon )
s[2] = ' ';
if ( s[0] == '0' )
s[0] = ' ';
display( s ); // set LCD number/text
}
Main:
/****************************************************************************
** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "dclock.h"
#include <ntqapplication.h>
int main( int argc, char **argv )
{
TQApplication a( argc, argv );
DigitalClock *clock = new DigitalClock;
clock->resize( 170, 80 );
a.setMainWidget( clock );
clock->setCaption("TQt Example - Digital Clock");
clock->show();
return a.exec();
}
See also Examples.
| Copyright © 2007 Trolltech | Trademarks | TQt 3.3.8
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