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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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Qt Toolkit - validator/main.cpp example file
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<h1 align=center>Validators</h1><br clear="all">
In this example you see how to write and use an own validator.
<hr>
Header file of the validator: <pre>/****************************************************************************
** $Id: qt/examples/validator/motor.h 2.3.2 edited 2001-01-26 $
**
** 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 MOTOR_H
#define MOTOR_H
#include <<a href="qvalidator-h.html">qvalidator.h</a>>
#include <<a href="qspinbox-h.html">qspinbox.h</a>>
class MotorValidator: public QValidator
{
Q_OBJECT
public:
MotorValidator( <a href="qspinbox.html">QSpinBox</a> * parent, const char * name );
~MotorValidator();
void setRange( int bottom, int top, int step );
int bottom() { return b; }
int top() { return t; }
int step() { return s; }
<a href="qvalidator.html#State">QValidator::State</a> validate( <a href="qstring.html">QString</a> &, int & ) const;
private:
int b, t, s;
};
#endif
</pre>
<hr>
Implementation of the validator: <pre>/****************************************************************************
** $Id: qt/examples/validator/motor.cpp 2.3.2 edited 2001-01-26 $
**
** 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 "motor.h"
#include "<a href="qlineedit-h.html">qlineedit.h</a>"
#include "<a href="qpushbutton-h.html">qpushbutton.h</a>"
MotorValidator::MotorValidator( <a href="qspinbox.html">QSpinBox</a> * parent, const char * name )
: <a href="qvalidator.html">QValidator</a>( parent, name )
{
// just some random junk.
b = 0;
t = 42;
s = 2;
}
MotorValidator::~MotorValidator()
{
// nothing. wow. programming qt is easy.
}
void <a name="43"></a>MotorValidator::setRange( int bottom, int top, int step )
{
b = bottom;
t = top;
s = step;
}
// the guts of this example: return TRUE if motorSize describes an
// integer in the range b to t which can be described as n*s+b for
// some integer n.
<a href="qvalidator.html#State">QValidator::State</a> <a name="44"></a>MotorValidator::validate( <a href="qstring.html">QString</a> & motorSize, int & ) const
{
bool ok;
long int tmp = motorSize.toLong( &ok );
if ( !ok )
return QValidator::Invalid;
else if ( tmp < b || tmp > t || ((tmp-b)%s) != 0 )
return QValidator::Valid;
else
return QValidator::Acceptable;
}
</pre>
<hr>
Header file of the mainwidget: <pre>/****************************************************************************
** $Id: qt/examples/validator/vw.h 2.3.2 edited 2001-01-26 $
**
** 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 VW_H
#define VW_H
#include <<a href="qvalidator-h.html">qvalidator.h</a>>
#include <<a href="qstring-h.html">qstring.h</a>>
#include <<a href="qwidget-h.html">qwidget.h</a>>
class VW: public QWidget {
Q_OBJECT
public:
VW( <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0 );
~VW();
private slots:
void modelSelected( const QString& );
void motorSelected( int );
void yearSelected( int );
signals:
void validSelectionMade( const QString& );
private:
void computeSelection();
<a href="qstring.html">QString</a> currentModel;
int currentMotorSize;
int currentYear;
};
#endif
</pre>
<hr>
Implementation of the mainwidget: <pre>/****************************************************************************
** $Id: qt/examples/validator/vw.cpp 2.3.2 edited 2001-06-13 $
**
** 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 "vw.h"
#include <<a href="qlineedit-h.html">qlineedit.h</a>>
#include <<a href="qcombobox-h.html">qcombobox.h</a>>
#include <<a href="qspinbox-h.html">qspinbox.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
#include <<a href="qgroupbox-h.html">qgroupbox.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include "motor.h"
VW::VW( <a href="qwidget.html">QWidget</a> * parent, const char * name )
: <a href="qwidget.html">QWidget</a>( parent, name )
{
<a href="qhboxlayout.html">QHBoxLayout</a> * hb;
hb = new <a href="qhboxlayout.html">QHBoxLayout</a>( this, 10 );
<a href="qgroupbox.html">QGroupBox</a> * box;
box = new <a href="qgroupbox.html">QGroupBox</a>( this, "input box" );
hb-><a href="qboxlayout.html#ebba99">addWidget</a>( box, 0, AlignTop );
<a href="qvboxlayout.html">QVBoxLayout</a> * b;
// set up the input box
b = new <a href="qvboxlayout.html">QVBoxLayout</a>( box, 12 );
<a href="qlabel.html">QLabel</a> * l = new <a href="qlabel.html">QLabel</a>( "Enter Vehicle Details", box, "header" );
l-><a href="qwidget.html#c0b5fb">setMinimumSize</a>( l-><a href="qlabel.html#f40fcc">sizeHint</a>() );
b-><a href="qboxlayout.html#ebba99">addWidget</a>( l );
<a href="qframe.html">QFrame</a> * f = new <a href="qframe.html">QFrame</a>( box, "horizontal divider" );
f-><a href="qframe.html#558f79">setFrameStyle</a>( QFrame::HLine | QFrame::Sunken );
f-><a href="qwidget.html#e24afa">setMinimumHeight</a>( 12 );
b-><a href="qboxlayout.html#ebba99">addWidget</a>( f );
<a href="qgridlayout.html">QGridLayout</a> *grid = new <a href="qgridlayout.html">QGridLayout</a>( 3, 2 );
b-><a href="qboxlayout.html#6ff301">addLayout</a>( grid );
// here we start on the input grid, with labels and other widget
// neatly arranged. the variable names are reused all over the
// place.
<a href="qcombobox.html">QComboBox</a> * model = new <a href="qcombobox.html">QComboBox</a>( FALSE, box, "model selection" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Type 1 Beetle" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Camper" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Van" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Fastback" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Squareback" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Notchback" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "411" );
model-><a href="qcombobox.html#8a94f7">setCurrentItem</a>( model-><a href="qcombobox.html#a03e60">count</a>() - 1 ); // I like the 411
currentModel = "411";
model-><a href="qcombobox.html#613b4b">insertItem</a>( "412" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Karmann Ghia" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Thing" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Safari" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Kubelwagen" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Trekker" );
model-><a href="qcombobox.html#613b4b">insertItem</a>( "Baja" );
model-><a href="qwidget.html#c0b5fb">setMinimumSize</a>( model-><a href="qcombobox.html#dd19df">sizeHint</a>() );
model-><a href="qwidget.html#4e5337">setMaximumHeight</a>( model-><a href="qwidget.html#b24d94">minimumSize</a>().height() );
grid-><a href="qgridlayout.html#dac29c">addWidget</a>( model, 0, 1 );
l = new <a href="qlabel.html">QLabel</a>( model, "Model:", box, "model label" );
l-><a href="qwidget.html#c0b5fb">setMinimumSize</a>( l-><a href="qlabel.html#f40fcc">sizeHint</a>() );
grid-><a href="qgridlayout.html#dac29c">addWidget</a>( l, 0, 0 );
<a href="qspinbox.html">QSpinBox</a> * motor = new <a href="qspinbox.html">QSpinBox</a>( 1000, 1600, 100,
box, "motor size selection" );
motor-><a href="qspinbox.html#eb409b">setValue</a>( 1000 );
currentMotorSize = 1000;
motor-><a href="qwidget.html#c0b5fb">setMinimumSize</a>( motor-><a href="qspinbox.html#ffd3ee">sizeHint</a>() );
motor-><a href="qwidget.html#4e5337">setMaximumHeight</a>( motor-><a href="qwidget.html#b24d94">minimumSize</a>().height() );
grid-><a href="qgridlayout.html#dac29c">addWidget</a>( motor, 1, 1 );
l = new <a href="qlabel.html">QLabel</a>( motor, "Motor size (cc):", box, "motor size label" );
l-><a href="qwidget.html#c0b5fb">setMinimumSize</a>( l-><a href="qlabel.html#f40fcc">sizeHint</a>() );
grid-><a href="qgridlayout.html#dac29c">addWidget</a>( l, 1, 0 );
<a href="qspinbox.html">QSpinBox</a> * year = new <a href="qspinbox.html">QSpinBox</a>( box, "model year" );
year-><a href="qrangecontrol.html#f2409c">setRange</a>( 1949, 1981 );
year-><a href="qspinbox.html#eb409b">setValue</a>( 1949 );
currentYear = 1949;
year-><a href="qwidget.html#c0b5fb">setMinimumSize</a>( year-><a href="qspinbox.html#ffd3ee">sizeHint</a>() );
year-><a href="qwidget.html#4e5337">setMaximumHeight</a>( year-><a href="qwidget.html#b24d94">minimumSize</a>().height() );
grid-><a href="qgridlayout.html#dac29c">addWidget</a>( year, 2, 1 );
l = new <a href="qlabel.html">QLabel</a>( year, "Year:", box, "model year label" );
l-><a href="qwidget.html#c0b5fb">setMinimumSize</a>( l-><a href="qlabel.html#f40fcc">sizeHint</a>() );
grid-><a href="qgridlayout.html#dac29c">addWidget</a>( l, 2, 0 );
b-><a href="qboxlayout.html#0226eb">addStretch</a>( 1 );
b-><a href="qlayout.html#1cb33d">activate</a>();
// output box
box = new <a href="qgroupbox.html">QGroupBox</a>( this, "output box" );
hb-><a href="qboxlayout.html#ebba99">addWidget</a>( box, 0 );
b = new <a href="qvboxlayout.html">QVBoxLayout</a>( box, 12 );
l = new <a href="qlabel.html">QLabel</a>( "Resulting Limousine:", box, "header" );
l-><a href="qwidget.html#c0b5fb">setMinimumSize</a>( l-><a href="qlabel.html#f40fcc">sizeHint</a>() );
b-><a href="qboxlayout.html#ebba99">addWidget</a>( l );
f = new <a href="qframe.html">QFrame</a>( box, "horizontal divider" );
f-><a href="qframe.html#558f79">setFrameStyle</a>( QFrame::HLine | QFrame::Sunken );
f-><a href="qwidget.html#e24afa">setMinimumHeight</a>( 12 );
b-><a href="qboxlayout.html#ebba99">addWidget</a>( f );
l = new <a href="qlabel.html">QLabel</a>( box, "output label" );
l-><a href="qlabel.html#4743c8">setAlignment</a>( AlignTop | AlignLeft | WordBreak );
l-><a href="qlabel.html#bc5ea6">setText</a>( "No VW selected yet." );
b-><a href="qboxlayout.html#ebba99">addWidget</a>( l, 1 );
b-><a href="qboxlayout.html#0226eb">addStretch</a>( 1 );
b-><a href="qlayout.html#1cb33d">activate</a>();
hb-><a href="qlayout.html#1cb33d">activate</a>();
// set up connections
<a href="qobject.html#7f8e37">connect</a>( model, SIGNAL(activated(const QString&)),
this, SLOT(<a href=#45>modelSelected</a>(const QString&)) );
<a href="qobject.html#7f8e37">connect</a>( motor, SIGNAL(valueChanged(int)),
this, SLOT(<a href=#46>motorSelected</a>(int)) );
<a href="qobject.html#7f8e37">connect</a>( year, SIGNAL(valueChanged(int)),
this, SLOT(<a href=#47>yearSelected</a>(int)) );
<a href="qobject.html#7f8e37">connect</a>( this, SIGNAL(validSelectionMade(const QString&)),
l, SLOT(setText(const QString&)) );
}
VW::~VW()
{
// nothing needs to be done.
}
void <a name="45"></a>VW::modelSelected( const QString& m )
{
currentModel = m;
<a href=#48>computeSelection</a>();
}
void <a name="46"></a>VW::motorSelected( int m )
{
currentMotorSize = m;
<a href=#48>computeSelection</a>();
}
void <a name="47"></a>VW::yearSelected( int y )
{
currentYear = y;
<a href=#48>computeSelection</a>();
}
void <a name="48"></a>VW::computeSelection()
{
if ( currentModel.isNull() )
return; // no model selected yet
<a href="qstring.html">QString</a> s;
s.<a href="qstring.html#926f67">sprintf</a>( "You have selected a Volkswagen %s model %d with a "
"%d cm motor.\n\nGood choice!",
(const char *)currentModel,
(int)currentYear, currentMotorSize );
emit validSelectionMade( s );
}
</pre>
<hr>
Main:
<pre>/****************************************************************************
** $Id: qt/examples/validator/main.cpp 2.3.2 edited 2001-06-12 $
**
** 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 <<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>
#include "vw.h"
int main( int argc, char ** argv ) {
<a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );
VW mw;
a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( &mw );
mw.<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>( "Qt Example - Validators" );
mw.<a name="show"></a><a href="qwidget.html#200ee5">show</a>();
return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}
</pre>
<p><address><hr><div align="center">
<table width="100%" cellspacing="0" border="0"><tr>
<td>Copyright 2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
</table></div></address></body></html>
|
