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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>Line Edits</h1>
<p>
This example shows how to work with single lineedit widgets, and
how to use different echo modes and validators.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/lineedits.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 LINEDITS_H
#define LINEDITS_H
#include <<a href="qgroupbox-h.html">qgroupbox.h</a>>
class QLineEdit;
class QComboBox;
class LineEdits : public <a href="qgroupbox.html">QGroupBox</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
LineEdits( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
protected:
<a href="qlineedit.html">QLineEdit</a> *lined1, *lined2, *lined3, *lined4;
<a href="qcombobox.html">QComboBox</a> *combo1, *combo2, *combo3, *combo4;
protected slots:
void slotEchoChanged( int );
void slotValidatorChanged( int );
void slotAlignmentChanged( int );
void slotReadOnlyChanged( int );
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/lineedits.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 "lineedits.h"
#include <<a href="qlineedit-h.html">qlineedit.h</a>>
#include <<a href="qcombobox-h.html">qcombobox.h</a>>
#include <<a href="qframe-h.html">qframe.h</a>>
#include <<a href="qvalidator-h.html">qvalidator.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
#include <<a href="qhbox-h.html">qhbox.h</a>>
/*
* Constructor
*
* Creates child widgets of the LineEdits widget
*/
<a name="f395"></a>LineEdits::LineEdits( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qgroupbox.html">QGroupBox</a>( 0, Horizontal, "Line edits", parent, name )
{
<a href="qframe.html#setMargin">setMargin</a>( 10 );
<a href="qvboxlayout.html">QVBoxLayout</a>* box = new <a href="qvboxlayout.html">QVBoxLayout</a>( <a href="qwidget.html#layout">layout</a>() );
<a href="qhboxlayout.html">QHBoxLayout</a> *row1 = new <a href="qhboxlayout.html">QHBoxLayout</a>( box );
<a name="x1297"></a> row1-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// Create a Label
<a href="qlabel.html">QLabel</a>* label = new <a href="qlabel.html">QLabel</a>( "Echo Mode: ", this);
<a name="x1293"></a> row1-><a href="qboxlayout.html#addWidget">addWidget</a>( label );
// Create a Combobox with three items...
combo1 = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
row1-><a href="qboxlayout.html#addWidget">addWidget</a>( combo1 );
<a name="x1295"></a> combo1-><a href="qcombobox.html#insertItem">insertItem</a>( "Normal", -1 );
combo1-><a href="qcombobox.html#insertItem">insertItem</a>( "Password", -1 );
combo1-><a href="qcombobox.html#insertItem">insertItem</a>( "No Echo", -1 );
// ...and connect the activated() SIGNAL with the slotEchoChanged() SLOT to be able
// to react when an item is selected
<a name="x1294"></a> <a href="qobject.html#connect">connect</a>( combo1, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ), this, SLOT( slotEchoChanged( int ) ) );
// insert the first LineEdit
lined1 = new <a href="qlineedit.html">QLineEdit</a>( this );
box-><a href="qboxlayout.html#addWidget">addWidget</a>( lined1 );
// another widget which is used for layouting
<a href="qhboxlayout.html">QHBoxLayout</a> *row2 = new <a href="qhboxlayout.html">QHBoxLayout</a>( box );
row2-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// and the second label
label = new <a href="qlabel.html">QLabel</a>( "Validator: ", this );
row2-><a href="qboxlayout.html#addWidget">addWidget</a>( label );
// A second Combobox with again three items...
combo2 = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
row2-><a href="qboxlayout.html#addWidget">addWidget</a>( combo2 );
combo2-><a href="qcombobox.html#insertItem">insertItem</a>( "No Validator", -1 );
combo2-><a href="qcombobox.html#insertItem">insertItem</a>( "Integer Validator", -1 );
combo2-><a href="qcombobox.html#insertItem">insertItem</a>( "Double Validator", -1 );
// ...and again the activated() SIGNAL gets connected with a SLOT
<a href="qobject.html#connect">connect</a>( combo2, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ), this, SLOT( slotValidatorChanged( int ) ) );
// and the second LineEdit
lined2 = new <a href="qlineedit.html">QLineEdit</a>( this );
box-><a href="qboxlayout.html#addWidget">addWidget</a>( lined2 );
// yet another widget which is used for layouting
<a href="qhboxlayout.html">QHBoxLayout</a> *row3 = new <a href="qhboxlayout.html">QHBoxLayout</a>( box );
row3-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// we need a label for this too
label = new <a href="qlabel.html">QLabel</a>( "Alignment: ", this );
row3-><a href="qboxlayout.html#addWidget">addWidget</a>( label );
// A combo box for setting alignment
combo3 = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
row3-><a href="qboxlayout.html#addWidget">addWidget</a>( combo3 );
combo3-><a href="qcombobox.html#insertItem">insertItem</a>( "Left", -1 );
combo3-><a href="qcombobox.html#insertItem">insertItem</a>( "Centered", -1 );
combo3-><a href="qcombobox.html#insertItem">insertItem</a>( "Right", -1 );
// ...and again the activated() SIGNAL gets connected with a SLOT
<a href="qobject.html#connect">connect</a>( combo3, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ), this, SLOT( slotAlignmentChanged( int ) ) );
// and the third lineedit
lined3 = new <a href="qlineedit.html">QLineEdit</a>( this );
box-><a href="qboxlayout.html#addWidget">addWidget</a>( lined3 );
// last widget used for layouting
<a href="qhbox.html">QHBox</a> *row4 = new <a href="qhbox.html">QHBox</a>( this );
box-><a href="qboxlayout.html#addWidget">addWidget</a>( row4 );
row4-><a href="qframe.html#setMargin">setMargin</a>( 5 );
// last label
(void)new <a href="qlabel.html">QLabel</a>( "Read-Only: ", row4 );
// A combo box for setting alignment
combo4 = new <a href="qcombobox.html">QComboBox</a>( FALSE, row4 );
combo4-><a href="qcombobox.html#insertItem">insertItem</a>( "False", -1 );
combo4-><a href="qcombobox.html#insertItem">insertItem</a>( "True", -1 );
// ...and again the activated() SIGNAL gets connected with a SLOT
<a href="qobject.html#connect">connect</a>( combo4, SIGNAL( <a href="qcombobox.html#activated">activated</a>( int ) ), this, SLOT( slotReadOnlyChanged( int ) ) );
// and the last lineedit
lined4 = new <a href="qlineedit.html">QLineEdit</a>( this );
box-><a href="qboxlayout.html#addWidget">addWidget</a>( lined4 );
// give the first LineEdit the focus at the beginning
<a name="x1303"></a> lined1-><a href="qwidget.html#setFocus">setFocus</a>();
}
/*
* SLOT slotEchoChanged( int i )
*
* i contains the number of the item which the user has been chosen in the
* first Combobox. According to this value, we set the Echo-Mode for the
* first LineEdit.
*/
void <a name="f396"></a>LineEdits::slotEchoChanged( int i )
{
switch ( i ) {
case 0:
<a name="x1299"></a> lined1-><a href="qlineedit.html#setEchoMode">setEchoMode</a>( QLineEdit::Normal );
break;
case 1:
lined1-><a href="qlineedit.html#setEchoMode">setEchoMode</a>( QLineEdit::Password );
break;
case 2:
lined1-><a href="qlineedit.html#setEchoMode">setEchoMode</a>( QLineEdit::NoEcho );
break;
}
lined1-><a href="qwidget.html#setFocus">setFocus</a>();
}
/*
* SLOT slotValidatorChanged( int i )
*
* i contains the number of the item which the user has been chosen in the
* second Combobox. According to this value, we set a validator for the
* second LineEdit. A validator checks in a LineEdit each character which
* the user enters and accepts it if it is valid, else the character gets
* ignored and not inserted into the lineedit.
*/
void <a name="f397"></a>LineEdits::slotValidatorChanged( int i )
{
switch ( i ) {
case 0:
<a name="x1302"></a> lined2-><a href="qlineedit.html#setValidator">setValidator</a>( 0 );
break;
case 1:
lined2-><a href="qlineedit.html#setValidator">setValidator</a>( new <a href="qintvalidator.html">QIntValidator</a>( lined2 ) );
break;
case 2:
lined2-><a href="qlineedit.html#setValidator">setValidator</a>( new <a href="qdoublevalidator.html">QDoubleValidator</a>( -999.0, 999.0, 2,
lined2 ) );
break;
}
<a name="x1301"></a> lined2-><a href="qlineedit.html#setText">setText</a>( "" );
lined2-><a href="qwidget.html#setFocus">setFocus</a>();
}
/*
* SLOT slotAlignmentChanged( int i )
*
* i contains the number of the item which the user has been chosen in
* the third Combobox. According to this value, we set an alignment
* third LineEdit.
*/
void <a name="f398"></a>LineEdits::slotAlignmentChanged( int i )
{
switch ( i ) {
case 0:
<a name="x1298"></a> lined3-><a href="qlineedit.html#setAlignment">setAlignment</a>( QLineEdit::AlignLeft );
break;
case 1:
lined3-><a href="qlineedit.html#setAlignment">setAlignment</a>( QLineEdit::AlignCenter );
break;
case 2:
lined3-><a href="qlineedit.html#setAlignment">setAlignment</a>( QLineEdit::AlignRight );
break;
}
lined3-><a href="qwidget.html#setFocus">setFocus</a>();
}
/*
* SLOT slotReadOnlyChanged( int i )
*
* i contains the number of the item which the user has been chosen in
* the fourth Combobox. According to this value, we toggle read-only.
*/
void <a name="f399"></a>LineEdits::slotReadOnlyChanged( int i )
{
switch ( i ) {
case 0:
<a name="x1300"></a> lined4-><a href="qlineedit.html#setReadOnly">setReadOnly</a>( FALSE );
break;
case 1:
lined4-><a href="qlineedit.html#setReadOnly">setReadOnly</a>( TRUE );
break;
}
lined4-><a href="qwidget.html#setFocus">setFocus</a>();
}
</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 "lineedits.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 );
LineEdits lineedits;
lineedits.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Lineedits" );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &lineedits );
lineedits.<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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<td>Copyright © 2001
<a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt version 3.0.2</div>
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