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<title>Progress Bar</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Progress Bar</h1>
<p>
This example shows how to use a progress bar.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/progressbar.h 3.0.2 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef PROGRESSBAR_H
#define PROGRESSBAR_H
#include <<a href="qbuttongroup-h.html">qbuttongroup.h</a>>
#include <<a href="qtimer-h.html">qtimer.h</a>>
class QRadioButton;
class QPushButton;
class QProgressBar;
class ProgressBar : public <a href="qbuttongroup.html">QButtonGroup</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
ProgressBar( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
protected:
<a href="qradiobutton.html">QRadioButton</a> *slow, *normal, *fast;
<a href="qpushbutton.html">QPushButton</a> *start, *pause, *reset;
<a href="qprogressbar.html">QProgressBar</a> *progress;
<a href="qtimer.html">QTimer</a> timer;
protected slots:
void slotStart();
void slotReset();
void slotTimeout();
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/progressbar.cpp 3.0.2 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "progressbar.h"
#include <<a href="qradiobutton-h.html">qradiobutton.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a href="qprogressbar-h.html">qprogressbar.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
#include <<a href="qmotifstyle-h.html">qmotifstyle.h</a>>
/*
* Constructor
*
* Creates child widgets of the ProgressBar widget
*/
<a name="f284"></a>ProgressBar::ProgressBar( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qbuttongroup.html">QButtonGroup</a>( 0, Horizontal, "Progress Bar", parent, name ), timer()
{
<a href="qframe.html#setMargin">setMargin</a>( 10 );
<a href="qgridlayout.html">QGridLayout</a>* toplayout = new <a href="qgridlayout.html">QGridLayout</a>( <a href="qwidget.html#layout">layout</a>(), 2, 2, 5);
<a href="qbuttongroup.html#setRadioButtonExclusive">setRadioButtonExclusive</a>( TRUE );
// insert three radiobuttons which the user can use
// to set the speed of the progress and two pushbuttons
// to start/pause/continue and reset the progress
slow = new <a href="qradiobutton.html">QRadioButton</a>( "&Slow", this );
normal = new <a href="qradiobutton.html">QRadioButton</a>( "&Normal", this );
fast = new <a href="qradiobutton.html">QRadioButton</a>( "&Fast", this );
<a href="qvboxlayout.html">QVBoxLayout</a>* vb1 = new <a href="qvboxlayout.html">QVBoxLayout</a>;
<a name="x817"></a> toplayout-><a href="qgridlayout.html#addLayout">addLayout</a>( vb1, 0, 0 );
vb1-><a href="qboxlayout.html#addWidget">addWidget</a>( slow );
vb1-><a href="qboxlayout.html#addWidget">addWidget</a>( normal );
vb1-><a href="qboxlayout.html#addWidget">addWidget</a>( fast );
// two push buttons, one for start, for for reset.
start = new <a href="qpushbutton.html">QPushButton</a>( "&Start", this );
reset = new <a href="qpushbutton.html">QPushButton</a>( "&Reset", this );
<a href="qvboxlayout.html">QVBoxLayout</a>* vb2 = new <a href="qvboxlayout.html">QVBoxLayout</a>;
toplayout-><a href="qgridlayout.html#addLayout">addLayout</a>( vb2, 0, 1 );
vb2-><a href="qboxlayout.html#addWidget">addWidget</a>( start );
vb2-><a href="qboxlayout.html#addWidget">addWidget</a>( reset );
// Create the progressbar
progress = new <a href="qprogressbar.html">QProgressBar</a>( 100, this );
<a name="x828"></a> // progress-><a href="qwidget.html#setStyle">setStyle</a>( new <a href="qmotifstyle.html">QMotifStyle</a>() );
<a name="x818"></a> toplayout-><a href="qgridlayout.html#addMultiCellWidget">addMultiCellWidget</a>( progress, 1, 1, 0, 1 );
// connect the clicked() SIGNALs of the pushbuttons to SLOTs
<a href="qobject.html#connect">connect</a>( start, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( slotStart() ) );
<a href="qobject.html#connect">connect</a>( reset, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( slotReset() ) );
// connect the timeout() SIGNAL of the progress-timer to a SLOT
<a href="qobject.html#connect">connect</a>( &timer, SIGNAL( timeout() ), this, SLOT( slotTimeout() ) );
// Let's start with normal speed...
<a name="x825"></a> normal-><a href="qradiobutton.html#setChecked">setChecked</a>( TRUE );
// some contraints
<a name="x827"></a> start-><a href="qwidget.html#setFixedWidth">setFixedWidth</a>( 80 );
<a href="qwidget.html#setMinimumWidth">setMinimumWidth</a>( 300 );
}
/*
* SLOT slotStart
*
* This SLOT is called if the user clicks start/pause/continue
* button
*/
void <a name="f285"></a>ProgressBar::slotStart()
{
// If the progress bar is at the beginning...
<a name="x819"></a> if ( progress-><a href="qprogressbar.html#progress">progress</a>() == -1 ) {
// ...set according to the checked speed-radiobutton
// the number of steps which are needed to complete the process
<a name="x824"></a> if ( slow-><a href="qradiobutton.html#isChecked">isChecked</a>() )
<a name="x822"></a> progress-><a href="qprogressbar.html#setTotalSteps">setTotalSteps</a>( 10000 );
else if ( normal-><a href="qradiobutton.html#isChecked">isChecked</a>() )
progress-><a href="qprogressbar.html#setTotalSteps">setTotalSteps</a>( 1000 );
else
progress-><a href="qprogressbar.html#setTotalSteps">setTotalSteps</a>( 50 );
// disable the speed-radiobuttons
<a name="x826"></a> slow-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
normal-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
fast-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
}
// If the progress is not running...
if ( !timer.isActive() ) {
// ...start the timer (and so the progress) with a interval of 1 ms...
timer.start( 1 );
// ...and rename the start/pause/continue button to Pause
<a name="x816"></a> start-><a href="qbutton.html#setText">setText</a>( "&Pause" );
} else { // if the prgress is running...
// ...stop the timer (and so the prgress)...
timer.stop();
// ...and rename the start/pause/continue button to Continue
start-><a href="qbutton.html#setText">setText</a>( "&Continue" );
}
}
/*
* SLOT slotReset
*
* This SLOT is called when the user clicks the reset button
*/
void <a name="f286"></a>ProgressBar::slotReset()
{
// stop the timer and progress
timer.stop();
// rename the start/pause/continue button to Start...
start-><a href="qbutton.html#setText">setText</a>( "&Start" );
// ...and enable this button
start-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE );
// enable the speed-radiobuttons
slow-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE );
normal-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE );
fast-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE );
// reset the progressbar
<a name="x820"></a> progress-><a href="qprogressbar.html#reset">reset</a>();
}
/*
* SLOT slotTimeout
*
* This SLOT is called each ms when the timer is
* active (== progress is running)
*/
void <a name="f287"></a>ProgressBar::slotTimeout()
{
int p = progress-><a href="qprogressbar.html#progress">progress</a>();
#if 1
// If the progress is complete...
<a name="x823"></a> if ( p == progress-><a href="qprogressbar.html#totalSteps">totalSteps</a>() ) {
// ...rename the start/pause/continue button to Start...
start-><a href="qbutton.html#setText">setText</a>( "&Start" );
// ...and disable it...
start-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
// ...and return
return;
}
#endif
// If the process is not complete increase it
<a name="x821"></a> progress-><a href="qprogressbar.html#setProgress">setProgress</a>( ++p );
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.0.2 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "progressbar.h"
#include <<a href="qapplication-h.html">qapplication.h</a>>
int main(int argc,char **argv)
{
<a href="qapplication.html">QApplication</a> a(argc,argv);
ProgressBar progressbar;
progressbar.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - ProgressBar");
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>(&progressbar);
progressbar.<a href="qwidget.html#show">show</a>();
return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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