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qt3/doc/html/customlayout-example.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/customlayout/customlayout.doc:4 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Customized Layoutmanager</title>
<style type="text/css"><!--
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--></style>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
<a href="index.html">
<font color="#004faf">Home</font></a>
| <a href="classes.html">
<font color="#004faf">All&nbsp;Classes</font></a>
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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>Customized Layoutmanager</h1>
<p>
This examples demonstrates how to write customized layout (geometry) managers
like card layouts, border layout and flow layouts.
<p> See also: <a href="layout.html">Documentation of Geometry Management</a>.
<p> <hr>
<p> Header file of the flow layout:
<p> <pre>/****************************************************************************
** $Id: qt/flow.h 3.3.8 edited Jan 11 14:46 $
**
** Definition of simple flow layout for custom layout example
**
** Created : 979899
**
** Copyright (C) 1997-2007 Trolltech ASA. 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 FLOW_H
#define FLOW_H
#include &lt;<a href="qlayout-h.html">qlayout.h</a>&gt;
#include &lt;<a href="qptrlist-h.html">qptrlist.h</a>&gt;
class SimpleFlow : public <a href="qlayout.html">QLayout</a>
{
public:
SimpleFlow( <a href="qwidget.html">QWidget</a> *parent, int border=0, int space=-1,
const char *name=0 )
: <a href="qlayout.html">QLayout</a>( parent, border, space, name ),
cached_width(0) {}
SimpleFlow( <a href="qlayout.html">QLayout</a>* parent, int space=-1, const char *name=0 )
: <a href="qlayout.html">QLayout</a>( parent, space, name ),
cached_width(0) {}
SimpleFlow( int space=-1, const char *name=0 )
: <a href="qlayout.html">QLayout</a>( space, name ),
cached_width(0) {}
~SimpleFlow();
void addItem( <a href="qlayoutitem.html">QLayoutItem</a> *item);
bool hasHeightForWidth() const;
int heightForWidth( int ) const;
<a href="qsize.html">QSize</a> sizeHint() const;
<a href="qsize.html">QSize</a> minimumSize() const;
<a href="qlayoutiterator.html">QLayoutIterator</a> iterator();
QSizePolicy::ExpandData expanding() const;
protected:
void setGeometry( const <a href="qrect.html">QRect</a>&amp; );
private:
int doLayout( const <a href="qrect.html">QRect</a>&amp;, bool testonly = FALSE );
<a href="qptrlist.html">QPtrList</a>&lt;QLayoutItem&gt; list;
int cached_width;
int cached_hfw;
};
#endif
</pre>
<p> <hr>
<p> Implementation of the flow layout:
<p> <pre>/****************************************************************************
** $Id: qt/flow.cpp 3.3.8 edited Jan 11 14:46 $
**
** Implementing your own layout: flow example
**
** Copyright (C) 1996-2007 Trolltech ASA. 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 "flow.h"
class SimpleFlowIterator :public <a href="qglayoutiterator.html">QGLayoutIterator</a>
{
public:
SimpleFlowIterator( <a href="qptrlist.html">QPtrList</a>&lt;QLayoutItem&gt; *l ) :idx(0), list(l) {}
uint count() const;
<a href="qlayoutitem.html">QLayoutItem</a> *current();
<a href="qlayoutitem.html">QLayoutItem</a> *next();
<a href="qlayoutitem.html">QLayoutItem</a> *takeCurrent();
private:
int idx;
<a href="qptrlist.html">QPtrList</a>&lt;QLayoutItem&gt; *list;
};
uint <a name="f452"></a>SimpleFlowIterator::count() const
{
<a name="x1479"></a> return list-&gt;<a href="qptrlist.html#count">count</a>();
}
<a name="x1464"></a>QLayoutItem *SimpleFlowIterator::<a href="qglayoutiterator.html#current">current</a>()
{
<a name="x1478"></a> return idx &lt; int(count()) ? list-&gt;<a href="qptrlist.html#at">at</a>(idx) : 0;
}
<a name="x1465"></a>QLayoutItem *SimpleFlowIterator::<a href="qglayoutiterator.html#next">next</a>()
{
idx++; return current();
}
<a name="x1466"></a>QLayoutItem *SimpleFlowIterator::<a href="qglayoutiterator.html#takeCurrent">takeCurrent</a>()
{
<a name="x1480"></a> return idx &lt; int(count()) ? list-&gt;<a href="qptrlist.html#take">take</a>( idx ) : 0;
}
SimpleFlow::~SimpleFlow()
{
<a href="qlayout.html#deleteAllItems">deleteAllItems</a>();
}
<a name="x1473"></a>int SimpleFlow::<a href="qlayoutitem.html#heightForWidth">heightForWidth</a>( int w ) const
{
if ( cached_width != w ) {
//Not all C++ compilers support "mutable" yet:
SimpleFlow * mthis = (SimpleFlow*)this;
int h = mthis-&gt;doLayout( QRect(0,0,w,0), TRUE );
mthis-&gt;cached_hfw = h;
mthis-&gt;cached_width = w;
return h;
}
return cached_hfw;
}
<a name="x1467"></a>void SimpleFlow::<a href="qlayout.html#addItem">addItem</a>( <a href="qlayoutitem.html">QLayoutItem</a> *item)
{
<a name="x1477"></a> list.<a href="qptrlist.html#append">append</a>( item );
}
<a name="x1472"></a>bool SimpleFlow::<a href="qlayoutitem.html#hasHeightForWidth">hasHeightForWidth</a>() const
{
return TRUE;
}
<a name="x1476"></a>QSize SimpleFlow::<a href="qlayoutitem.html#sizeHint">sizeHint</a>() const
{
return minimumSize();
}
<a name="x1468"></a>QSizePolicy::ExpandData SimpleFlow::<a href="qlayout.html#expanding">expanding</a>() const
{
return QSizePolicy::NoDirection;
}
<a name="x1469"></a>QLayoutIterator SimpleFlow::<a href="qlayout.html#iterator">iterator</a>()
{
return QLayoutIterator( new SimpleFlowIterator( &amp;list ) );
}
<a name="x1471"></a>void SimpleFlow::<a href="qlayout.html#setGeometry">setGeometry</a>( const <a href="qrect.html">QRect</a> &amp;r )
{
QLayout::<a href="qlayout.html#setGeometry">setGeometry</a>( r );
doLayout( r );
}
int <a name="f451"></a>SimpleFlow::doLayout( const <a href="qrect.html">QRect</a> &amp;r, bool testonly )
{
int x = r.<a href="qrect.html#x">x</a>();
int y = r.<a href="qrect.html#y">y</a>();
int h = 0; //height of this line so far.
<a href="qptrlistiterator.html">QPtrListIterator</a>&lt;QLayoutItem&gt; it(list);
<a href="qlayoutitem.html">QLayoutItem</a> *o;
<a name="x1481"></a> while ( (o=it.<a href="qptrlistiterator.html#current">current</a>()) != 0 ) {
++it;
int nextX = x + o-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().width() + spacing();
<a name="x1482"></a> if ( nextX - spacing() &gt; r.<a href="qrect.html#right">right</a>() &amp;&amp; h &gt; 0 ) {
x = r.<a href="qrect.html#x">x</a>();
y = y + h + spacing();
nextX = x + o-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().width() + spacing();
h = 0;
}
if ( !testonly )
<a name="x1475"></a> o-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( QPoint( x, y ), o-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>() ) );
x = nextX;
h = QMAX( h, o-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().height() );
}
return y + h - r.<a href="qrect.html#y">y</a>();
}
<a name="x1470"></a>QSize SimpleFlow::<a href="qlayout.html#minimumSize">minimumSize</a>() const
{
<a href="qsize.html">QSize</a> s(0,0);
<a href="qptrlistiterator.html">QPtrListIterator</a>&lt;QLayoutItem&gt; it(list);
<a href="qlayoutitem.html">QLayoutItem</a> *o;
while ( (o=it.<a href="qptrlistiterator.html#current">current</a>()) != 0 ) {
++it;
<a name="x1485"></a><a name="x1474"></a> s = s.<a href="qsize.html#expandedTo">expandedTo</a>( o-&gt;<a href="qlayoutitem.html#minimumSize">minimumSize</a>() );
}
return s;
}
</pre>
<p> <hr>
<p> Header file of the border layout:
<p> <pre>/****************************************************************************
** $Id: qt/border.h 3.3.8 edited Jan 11 14:46 $
**
** Definition of simple flow layout for custom layout example
**
** Created : 979899
**
** Copyright (C) 1997-2007 Trolltech ASA. 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 BORDER_H
#define BORDER_H
#include &lt;<a href="qlayout-h.html">qlayout.h</a>&gt;
#include &lt;<a href="qptrlist-h.html">qptrlist.h</a>&gt;
class BorderWidgetItem : public <a href="qwidgetitem.html">QWidgetItem</a>
{
public:
BorderWidgetItem( <a href="qwidget.html">QWidget</a> *w )
: <a href="qwidgetitem.html">QWidgetItem</a>( w )
{}
void setGeometry( const <a href="qrect.html">QRect</a> &amp;r )
{ widget()-&gt;setGeometry( r ); }
};
class BorderLayout : public <a href="qlayout.html">QLayout</a>
{
public:
enum Position {
West = 0,
North,
South,
East,
Center
};
struct BorderLayoutStruct
{
BorderLayoutStruct( <a href="qlayoutitem.html">QLayoutItem</a> *i, Position p ) {
item = i;
pos = p;
}
<a href="qlayoutitem.html">QLayoutItem</a> *item;
Position pos;
};
enum SizeType {
Minimum = 0,
SizeHint
};
BorderLayout( <a href="qwidget.html">QWidget</a> *parent, int border = 0, int autoBorder = -1,
const char *name = 0 )
: <a href="qlayout.html">QLayout</a>( parent, border, autoBorder, name ), cached( 0, 0 ), mcached( 0, 0 ),
sizeDirty( TRUE ), msizeDirty( TRUE )
{}
BorderLayout( <a href="qlayout.html">QLayout</a>* parent, int autoBorder = -1, const char *name = 0 )
: <a href="qlayout.html">QLayout</a>( parent, autoBorder, name ), cached( 0, 0 ), mcached( 0, 0 ),
sizeDirty( TRUE ), msizeDirty( TRUE )
{}
BorderLayout( int autoBorder = -1, const char *name = 0 )
: <a href="qlayout.html">QLayout</a>( autoBorder, name ), cached( 0, 0 ), mcached( 0, 0 ),
sizeDirty( TRUE ), msizeDirty( TRUE )
{}
~BorderLayout();
void addItem( <a href="qlayoutitem.html">QLayoutItem</a> *item );
void addWidget( <a href="qwidget.html">QWidget</a> *widget, Position pos );
void add( <a href="qlayoutitem.html">QLayoutItem</a> *item, Position pos );
bool hasHeightForWidth() const;
<a href="qsize.html">QSize</a> sizeHint() const;
<a href="qsize.html">QSize</a> minimumSize() const;
<a href="qlayoutiterator.html">QLayoutIterator</a> iterator();
QSizePolicy::ExpandData expanding() const;
protected:
void setGeometry( const <a href="qrect.html">QRect</a> &amp;rect );
private:
void doLayout( const <a href="qrect.html">QRect</a> &amp;rect, bool testonly = FALSE );
void calcSize( SizeType st );
<a href="qptrlist.html">QPtrList</a>&lt;BorderLayoutStruct&gt; list;
<a href="qsize.html">QSize</a> cached, mcached;
bool sizeDirty, msizeDirty;
};
#endif
</pre>
<p> <hr>
<p> Implementation of the border layout:
<p> <pre>/****************************************************************************
** $Id: qt/border.cpp 3.3.8 edited Jan 11 14:46 $
**
** Implementing your own layout: flow example
**
** Copyright (C) 1996-2007 Trolltech ASA. 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 "border.h"
class BorderLayoutIterator : public <a href="qglayoutiterator.html">QGLayoutIterator</a>
{
public:
BorderLayoutIterator( const <a href="qptrlist.html">QPtrList</a>&lt;BorderLayout::BorderLayoutStruct&gt; *l )
: idx( 0 ) , list( (QPtrList&lt;BorderLayout::BorderLayoutStruct&gt;*)l )
{}
uint count() const;
<a href="qlayoutitem.html">QLayoutItem</a> *current();
BorderLayout::BorderLayoutStruct *currentStruct();
void toFirst();
<a href="qlayoutitem.html">QLayoutItem</a> *next();
<a href="qlayoutitem.html">QLayoutItem</a> *takeCurrent();
BorderLayoutIterator &amp;operator++();
private:
int idx;
<a href="qptrlist.html">QPtrList</a>&lt;BorderLayout::BorderLayoutStruct&gt; *list;
};
uint <a name="f456"></a>BorderLayoutIterator::count() const
{
<a name="x1502"></a> return list-&gt;<a href="qptrlist.html#count">count</a>();
}
<a name="x1486"></a>QLayoutItem *BorderLayoutIterator::<a href="qglayoutiterator.html#current">current</a>()
{
<a name="x1501"></a> return idx &lt; (int)count() ? list-&gt;<a href="qptrlist.html#at">at</a>( idx )-&gt;item : 0;
}
BorderLayout::BorderLayoutStruct *<a name="f457"></a>BorderLayoutIterator::currentStruct()
{
return idx &lt; (int)count() ? list-&gt;<a href="qptrlist.html#at">at</a>( idx ) : 0;
}
void <a name="f458"></a>BorderLayoutIterator::toFirst()
{
idx = 0;
}
<a name="x1487"></a>QLayoutItem *BorderLayoutIterator::<a href="qglayoutiterator.html#next">next</a>()
{
idx++;
return current();
}
<a name="x1488"></a>QLayoutItem *BorderLayoutIterator::<a href="qglayoutiterator.html#takeCurrent">takeCurrent</a>()
{
BorderLayout::BorderLayoutStruct *b
<a name="x1503"></a> = idx &lt; int( list-&gt;<a href="qptrlist.html#count">count</a>() ) ? list-&gt;<a href="qptrlist.html#take">take</a>( idx ) : 0;
<a href="qlayoutitem.html">QLayoutItem</a> *item = b ? b-&gt;item : 0;
delete b;
return item;
}
BorderLayoutIterator &amp;BorderLayoutIterator::operator++()
{
next();
return *this;
}
BorderLayout::~BorderLayout()
{
<a href="qlayout.html#deleteAllItems">deleteAllItems</a>();
}
<a name="x1490"></a>void BorderLayout::<a href="qlayout.html#addItem">addItem</a>( <a href="qlayoutitem.html">QLayoutItem</a> *item )
{
<a href="qlayout.html#add">add</a>( item, West );
}
void <a name="f453"></a>BorderLayout::addWidget( <a href="qwidget.html">QWidget</a> *widget, Position pos )
{
<a href="qlayout.html#add">add</a>( new BorderWidgetItem( widget ), pos );
}
<a name="x1489"></a>void BorderLayout::<a href="qlayout.html#add">add</a>( <a href="qlayoutitem.html">QLayoutItem</a> *item, Position pos )
{
<a name="x1500"></a> list.<a href="qptrlist.html#append">append</a>( new BorderLayoutStruct( item, pos ) );
sizeDirty = TRUE; msizeDirty = TRUE;
calcSize( SizeHint ); calcSize( Minimum );
}
<a name="x1496"></a>bool BorderLayout::<a href="qlayoutitem.html#hasHeightForWidth">hasHeightForWidth</a>() const
{
return FALSE;
}
<a name="x1499"></a>QSize BorderLayout::<a href="qlayoutitem.html#sizeHint">sizeHint</a>() const
{
return cached;
}
<a name="x1493"></a>QSize BorderLayout::<a href="qlayout.html#minimumSize">minimumSize</a>() const
{
return cached;
}
<a name="x1491"></a>QSizePolicy::ExpandData BorderLayout::<a href="qlayout.html#expanding">expanding</a>() const
{
return QSizePolicy::BothDirections;
}
<a name="x1492"></a>QLayoutIterator BorderLayout::<a href="qlayout.html#iterator">iterator</a>()
{
return QLayoutIterator( new BorderLayoutIterator( &amp;list ) );
}
<a name="x1494"></a>void BorderLayout::<a href="qlayout.html#setGeometry">setGeometry</a>( const <a href="qrect.html">QRect</a> &amp;rct )
{
QLayout::<a href="qlayout.html#setGeometry">setGeometry</a>( rct );
doLayout( rct );
}
void <a name="f454"></a>BorderLayout::doLayout( const <a href="qrect.html">QRect</a> &amp;rct, bool /*testonly*/ )
{
int ew = 0, ww = 0, nh = 0, sh = 0;
int h = 0;
BorderLayoutIterator it( &amp;list );
BorderLayoutStruct *o;
BorderLayoutStruct *center = 0;
while ( ( o = it.currentStruct() ) != 0 ) {
++it;
if ( o-&gt;pos == North ) {
<a name="x1506"></a><a name="x1505"></a><a name="x1498"></a> o-&gt;item-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( rct.<a href="qrect.html#x">x</a>(), nh, rct.<a href="qrect.html#width">width</a>(), o-&gt;item-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().height() ) );
<a name="x1495"></a> nh += o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().height() + spacing();
}
if ( o-&gt;pos == South ) {
o-&gt;item-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().x(), o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().y(),
rct.<a href="qrect.html#width">width</a>(), o-&gt;item-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().height() ) );
sh += o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().height() + spacing();
o-&gt;item-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( rct.<a href="qrect.html#x">x</a>(), rct.<a href="qrect.html#y">y</a>() + rct.<a href="qrect.html#height">height</a>() - sh + spacing(),
o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().width(), o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().height() ) );
}
if ( o-&gt;pos == Center )
center = o;
}
h = rct.<a href="qrect.html#height">height</a>() - nh - sh;
it.toFirst();
while ( ( o = it.currentStruct() ) != 0 ) {
++it;
if ( o-&gt;pos == West ) {
o-&gt;item-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( rct.<a href="qrect.html#x">x</a>() + ww, nh, o-&gt;item-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().width(), h ) );
ww += o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().width() + spacing();
}
if ( o-&gt;pos == East ) {
o-&gt;item-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().x(), o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().y(),
o-&gt;item-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().width(), h ) );
ew += o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().width() + spacing();
o-&gt;item-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( rct.<a href="qrect.html#x">x</a>() + rct.<a href="qrect.html#width">width</a>() - ew + spacing(), nh,
o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().width(), o-&gt;item-&gt;<a href="qlayoutitem.html#geometry">geometry</a>().height() ) );
}
}
if ( center )
center-&gt;item-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( QRect( ww, nh, rct.<a href="qrect.html#width">width</a>() - ew - ww, h ) );
}
void <a name="f455"></a>BorderLayout::calcSize( SizeType st )
{
if ( ( st == Minimum &amp;&amp; !msizeDirty ) ||
( st == SizeHint &amp;&amp; !sizeDirty ) )
return;
int w = 0, h = 0;
BorderLayoutIterator it( &amp;list );
BorderLayoutStruct *o;
while ( ( o = it.currentStruct() ) != 0 ) {
++it;
if ( o-&gt;pos == North ||
o-&gt;pos == South ) {
if ( st == Minimum )
<a name="x1497"></a> h += o-&gt;item-&gt;<a href="qlayoutitem.html#minimumSize">minimumSize</a>().height();
else
h += o-&gt;item-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().height();
}
else if ( o-&gt;pos == West ||
o-&gt;pos == East ) {
if ( st == Minimum )
w += o-&gt;item-&gt;<a href="qlayoutitem.html#minimumSize">minimumSize</a>().width();
else
w += o-&gt;item-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().width();
} else {
if ( st == Minimum ) {
h += o-&gt;item-&gt;<a href="qlayoutitem.html#minimumSize">minimumSize</a>().height();
w += o-&gt;item-&gt;<a href="qlayoutitem.html#minimumSize">minimumSize</a>().width();
}
else {
h += o-&gt;item-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().height();
w += o-&gt;item-&gt;<a href="qlayoutitem.html#sizeHint">sizeHint</a>().width();
}
}
}
if ( st == Minimum ) {
msizeDirty = FALSE;
mcached = QSize( w, h );
} else {
sizeDirty = FALSE;
cached = QSize( w, h );
}
return;
}
</pre>
<p> <hr>
<p> Header file of the card layout:
<p> <pre>/****************************************************************************
** $Id: qt/card.h 3.3.8 edited Jan 11 14:46 $
**
** Definition of simple flow layout for custom layout example
**
** Created : 979899
**
** Copyright (C) 1997-2007 Trolltech ASA. 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 CARD_H
#define CARD_H
#include &lt;<a href="qlayout-h.html">qlayout.h</a>&gt;
#include &lt;<a href="qptrlist-h.html">qptrlist.h</a>&gt;
class CardLayout : public <a href="qlayout.html">QLayout</a>
{
public:
CardLayout( <a href="qwidget.html">QWidget</a> *parent, int dist )
: <a href="qlayout.html">QLayout</a>( parent, 0, dist ) {}
CardLayout( <a href="qlayout.html">QLayout</a>* parent, int dist)
: <a href="qlayout.html">QLayout</a>( parent, dist ) {}
CardLayout( int dist )
: <a href="qlayout.html">QLayout</a>( dist ) {}
~CardLayout();
void addItem( <a href="qlayoutitem.html">QLayoutItem</a> *item );
<a href="qsize.html">QSize</a> sizeHint() const;
<a href="qsize.html">QSize</a> minimumSize() const;
<a href="qlayoutiterator.html">QLayoutIterator</a> iterator();
void setGeometry( const <a href="qrect.html">QRect</a> &amp;rect );
private:
<a href="qptrlist.html">QPtrList</a>&lt;QLayoutItem&gt; list;
};
#endif
</pre>
<p> <hr>
<p> Implementation of the card layout:
<p> <pre>/****************************************************************************
** $Id: qt/card.cpp 3.3.8 edited Jan 11 14:46 $
**
** Implementing your own layout: flow example
**
** Copyright (C) 1996-2007 Trolltech ASA. 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 "card.h"
class CardLayoutIterator :public <a href="qglayoutiterator.html">QGLayoutIterator</a>
{
public:
CardLayoutIterator( <a href="qptrlist.html">QPtrList</a>&lt;QLayoutItem&gt; *l )
: idx( 0 ), list( l ) {}
<a href="qlayoutitem.html">QLayoutItem</a> *current();
<a href="qlayoutitem.html">QLayoutItem</a> *next();
<a href="qlayoutitem.html">QLayoutItem</a> *takeCurrent();
private:
int idx;
<a href="qptrlist.html">QPtrList</a>&lt;QLayoutItem&gt; *list;
};
<a name="x1508"></a>QLayoutItem *CardLayoutIterator::<a href="qglayoutiterator.html#current">current</a>()
{
<a name="x1520"></a><a name="x1519"></a> return idx &lt; int( list-&gt;<a href="qptrlist.html#count">count</a>() ) ? list-&gt;<a href="qptrlist.html#at">at</a>( idx ) : 0;
}
<a name="x1509"></a>QLayoutItem *CardLayoutIterator::<a href="qglayoutiterator.html#next">next</a>()
{
idx++; return current();
}
<a name="x1510"></a>QLayoutItem *CardLayoutIterator::<a href="qglayoutiterator.html#takeCurrent">takeCurrent</a>()
{
<a name="x1521"></a> return idx &lt; int( list-&gt;<a href="qptrlist.html#count">count</a>() ) ?list-&gt;<a href="qptrlist.html#take">take</a>( idx ) : 0;
}
<a name="x1512"></a>QLayoutIterator CardLayout::<a href="qlayout.html#iterator">iterator</a>()
{
return QLayoutIterator( new CardLayoutIterator( &amp;list ) );
}
CardLayout::~CardLayout()
{
<a href="qlayout.html#deleteAllItems">deleteAllItems</a>();
}
<a name="x1511"></a>void CardLayout::<a href="qlayout.html#addItem">addItem</a>( <a href="qlayoutitem.html">QLayoutItem</a> *item )
{
<a name="x1518"></a> list.<a href="qptrlist.html#append">append</a>( item );
}
<a name="x1514"></a>void CardLayout::<a href="qlayout.html#setGeometry">setGeometry</a>( const <a href="qrect.html">QRect</a> &amp;rct )
{
QLayout::<a href="qlayout.html#setGeometry">setGeometry</a>( rct );
<a href="qptrlistiterator.html">QPtrListIterator</a>&lt;QLayoutItem&gt; it( list );
<a name="x1522"></a> if ( it.<a href="qptrlistiterator.html#count">count</a>() == 0 )
return;
<a href="qlayoutitem.html">QLayoutItem</a> *o;
int i = 0;
int w = rct.<a href="qrect.html#width">width</a>() - ( list.<a href="qptrlist.html#count">count</a>() - 1 ) * spacing();
int h = rct.<a href="qrect.html#height">height</a>() - ( list.<a href="qptrlist.html#count">count</a>() - 1 ) * spacing();
<a name="x1523"></a> while ( ( o=it.<a href="qptrlistiterator.html#current">current</a>() ) != 0 ) {
++it;
<a href="qrect.html">QRect</a> geom( rct.<a href="qrect.html#x">x</a>() + i * spacing(), rct.<a href="qrect.html#y">y</a>() + i * spacing(),
w, h );
<a name="x1516"></a> o-&gt;<a href="qlayoutitem.html#setGeometry">setGeometry</a>( geom );
++i;
}
}
<a name="x1517"></a>QSize CardLayout::<a href="qlayoutitem.html#sizeHint">sizeHint</a>() const
{
<a href="qsize.html">QSize</a> s(0,0);
int n = list.<a href="qptrlist.html#count">count</a>();
if ( n &gt; 0 )
s = QSize(100,70); //start with a nice default size
<a href="qptrlistiterator.html">QPtrListIterator</a>&lt;QLayoutItem&gt; it(list);
<a href="qlayoutitem.html">QLayoutItem</a> *o;
while ( (o=it.<a href="qptrlistiterator.html#current">current</a>()) != 0 ) {
++it;
<a name="x1528"></a><a name="x1515"></a> s = s.<a href="qsize.html#expandedTo">expandedTo</a>( o-&gt;<a href="qlayoutitem.html#minimumSize">minimumSize</a>() );
}
return s + n*QSize(<a href="qlayout.html#spacing">spacing</a>(),spacing());
}
<a name="x1513"></a>QSize CardLayout::<a href="qlayout.html#minimumSize">minimumSize</a>() const
{
<a href="qsize.html">QSize</a> s(0,0);
int n = list.<a href="qptrlist.html#count">count</a>();
<a href="qptrlistiterator.html">QPtrListIterator</a>&lt;QLayoutItem&gt; it(list);
<a href="qlayoutitem.html">QLayoutItem</a> *o;
while ( (o=it.<a href="qptrlistiterator.html#current">current</a>()) != 0 ) {
++it;
s = s.<a href="qsize.html#expandedTo">expandedTo</a>( o-&gt;<a href="qlayoutitem.html#minimumSize">minimumSize</a>() );
}
return s + n*QSize(<a href="qlayout.html#spacing">spacing</a>(),spacing());
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:46 $
**
** Main for custom layout example
**
** Copyright (C) 1996-2007 Trolltech ASA. 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 "flow.h"
#include "border.h"
#include "card.h"
#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
#include &lt;<a href="qcolor-h.html">qcolor.h</a>&gt;
#include &lt;<a href="qgroupbox-h.html">qgroupbox.h</a>&gt;
#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
#include &lt;<a href="qmultilineedit-h.html">qmultilineedit.h</a>&gt;
#include &lt;<a href="qcolor-h.html">qcolor.h</a>&gt;
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
<a href="qwidget.html">QWidget</a> *f = new <a href="qwidget.html">QWidget</a>;
<a href="qboxlayout.html">QBoxLayout</a> *gm = new <a href="qvboxlayout.html">QVBoxLayout</a>( f, 5 );
SimpleFlow *b1 = new SimpleFlow( gm );
<a name="x1536"></a> b1-&gt;<a href="qlayout.html#add">add</a>( new <a href="qpushbutton.html">QPushButton</a>( "Short", f ) );
b1-&gt;<a href="qlayout.html#add">add</a>( new <a href="qpushbutton.html">QPushButton</a>( "Longer", f ) );
b1-&gt;<a href="qlayout.html#add">add</a>( new <a href="qpushbutton.html">QPushButton</a>( "Different text", f ) );
b1-&gt;<a href="qlayout.html#add">add</a>( new <a href="qpushbutton.html">QPushButton</a>( "More text", f ) );
b1-&gt;<a href="qlayout.html#add">add</a>( new <a href="qpushbutton.html">QPushButton</a>( "Even longer button text", f ) );
<a href="qpushbutton.html">QPushButton</a>* qb = new <a href="qpushbutton.html">QPushButton</a>( "Quit", f );
a.<a href="qobject.html#connect">connect</a>( qb, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), SLOT( quit() ) );
b1-&gt;<a href="qlayout.html#add">add</a>( qb );
<a href="qwidget.html">QWidget</a> *wid = new <a href="qwidget.html">QWidget</a>( f );
BorderLayout *large = new BorderLayout( wid );
<a name="x1537"></a> large-&gt;<a href="qlayout.html#setSpacing">setSpacing</a>( 5 );
large-&gt;addWidget( new <a href="qpushbutton.html">QPushButton</a>( "North", wid ), BorderLayout::North );
large-&gt;addWidget( new <a href="qpushbutton.html">QPushButton</a>( "West", wid ), BorderLayout::West );
<a href="qmultilineedit.html">QMultiLineEdit</a>* m = new <a href="qmultilineedit.html">QMultiLineEdit</a>( wid );
m-&gt;<a href="qtextedit.html#setText">setText</a>( "Central\nWidget" );
large-&gt;addWidget( m, BorderLayout::Center );
<a href="qwidget.html">QWidget</a> *east1 = new <a href="qpushbutton.html">QPushButton</a>( "East", wid );
large-&gt;addWidget( east1, BorderLayout::East );
<a href="qwidget.html">QWidget</a> *east2 = new <a href="qpushbutton.html">QPushButton</a>( "East 2", wid );
large-&gt;addWidget( east2 , BorderLayout::East );
large-&gt;addWidget( new <a href="qpushbutton.html">QPushButton</a>( "South", wid ), BorderLayout::South );
//Left-to-right tab order looks better:
<a name="x1542"></a> <a href="qwidget.html">QWidget</a>::<a href="qwidget.html#setTabOrder">setTabOrder</a>( east2, east1 );
gm-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( wid );
wid = new <a href="qwidget.html">QWidget</a>( f );
CardLayout *card = new CardLayout( wid, 10 );
<a href="qwidget.html">QWidget</a> *crd = new <a href="qwidget.html">QWidget</a>( wid );
<a name="x1540"></a> crd-&gt;<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( Qt::red );
card-&gt;<a href="qlayout.html#add">add</a>( crd );
crd = new <a href="qwidget.html">QWidget</a>( wid );
crd-&gt;<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( Qt::green );
card-&gt;<a href="qlayout.html#add">add</a>( crd );
crd = new <a href="qwidget.html">QWidget</a>( wid );
crd-&gt;<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( Qt::blue );
card-&gt;<a href="qlayout.html#add">add</a>( crd );
crd = new <a href="qwidget.html">QWidget</a>( wid );
crd-&gt;<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( Qt::white );
card-&gt;<a href="qlayout.html#add">add</a>( crd );
crd = new <a href="qwidget.html">QWidget</a>( wid );
crd-&gt;<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( Qt::black );
card-&gt;<a href="qlayout.html#add">add</a>( crd );
crd = new <a href="qwidget.html">QWidget</a>( wid );
crd-&gt;<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( Qt::yellow );
card-&gt;<a href="qlayout.html#add">add</a>( crd );
gm-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( wid );
<a href="qlabel.html">QLabel</a>* s = new <a href="qlabel.html">QLabel</a>( f );
s-&gt;<a href="qlabel.html#setText">setText</a>( "outermost box" );
s-&gt;<a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Sunken );
s-&gt;<a href="qlabel.html#setAlignment">setAlignment</a>( Qt::AlignVCenter | Qt::AlignHCenter );
gm-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( s );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( f );
f-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Custom Layout");
f-&gt;<a href="qwidget.html#show">show</a>();
int result = a.<a href="qapplication.html#exec">exec</a>();
delete f;
return result;
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
<!-- eof -->
<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright &copy; 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt 3.3.8</div>
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