customlayout-main-cpp.html

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            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();

    <a href="qsizepolicy.html#ExpandData">QSizePolicy::ExpandData</a> expanding() const;

protected:
    void setGeometry( const QRect &amp;rect );

private:
    void doLayout( const QRect &amp;rect, bool testonly = FALSE );
    void calcSize( SizeType st );

    <a href="qlist.html">QList</a>&lt;BorderLayoutStruct&gt; list;
    <a href="qsize.html">QSize</a> cached, mcached;
    bool sizeDirty, msizeDirty;

};

#endif
</pre>


  <hr>

  Implementation of the Border-Layout: <pre>/****************************************************************************
** &#36;Id&#58; qt/examples/customlayout/border.cpp   2.3.8   edited 2004-05-12 $
**
** Implementing your own layout: flow example
**
** Copyright (C) 1996 by 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 "border.h"

class BorderLayoutIterator : public QGLayoutIterator
{
public:
    BorderLayoutIterator( const QList&lt;BorderLayout::BorderLayoutStruct&gt; *l )
        : idx( 0 ) , list( (<a href="qlist.html">QList</a>&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="qlist.html">QList</a>&lt;BorderLayout::BorderLayoutStruct&gt; *list;

};

uint <a name="273"></a>BorderLayoutIterator::count() const
{
    return list-&gt;<a href="qlist.html#359d9f">count</a>();
}

<a href="qlayoutitem.html">QLayoutItem</a> *<a name="274"></a>BorderLayoutIterator::current()
{
    return idx &lt; (int)count() ? list-&gt;<a href="qlist.html#0e7e42">at</a>( idx )-&gt;item : 0;
}

BorderLayout::BorderLayoutStruct *<a name="275"></a>BorderLayoutIterator::currentStruct()
{
    return idx &lt; (int)count() ? list-&gt;<a href="qlist.html#0e7e42">at</a>( idx ) : 0;
}

void <a name="276"></a>BorderLayoutIterator::toFirst()
{
    idx = 0;
}

<a href="qlayoutitem.html">QLayoutItem</a> *<a name="277"></a>BorderLayoutIterator::next()
{
    idx++;
    return current();
}

<a href="qlayoutitem.html">QLayoutItem</a> *<a name="278"></a>BorderLayoutIterator::takeCurrent()
{
    BorderLayout::BorderLayoutStruct *b
        = idx &lt; int( list-&gt;<a href="qlist.html#359d9f">count</a>() ) ? list-&gt;<a href="qlist.html#0639ad">take</a>(  idx  ) : 0;
    <a href="qlayoutitem.html">QLayoutItem</a> *item =  b ? b-&gt;item : 0;
    delete b;
    return item;
}

BorderLayoutIterator &amp;<a href=#279><a name="279"></a>BorderLayoutIterator::operator</a>++()
{
    <a href=#277>next</a>();
    return *this;
}

BorderLayout::~BorderLayout()
{
    deleteAllItems();
}

void <a name="280"></a>BorderLayout::addItem( <a href="qlayoutitem.html">QLayoutItem</a> *item )
{
    <a href=#282>add</a>( item, West );
}

void <a name="281"></a>BorderLayout::addWidget( <a href="qwidget.html">QWidget</a> *widget, Position pos )
{
    <a href=#282>add</a>( new BorderWidgetItem( widget ), pos );
}

void <a name="282"></a>BorderLayout::add( <a href="qlayoutitem.html">QLayoutItem</a> *item, Position pos )
{
    list.<a href="qlist.html#c5746a">append</a>( new BorderLayoutStruct( item, pos ) );
    sizeDirty = TRUE; msizeDirty = TRUE;
    <a href=#290>calcSize</a>( SizeHint ); calcSize( Minimum );
}

bool <a name="283"></a>BorderLayout::hasHeightForWidth() const
{
    return FALSE;
}

<a href="qsize.html">QSize</a> <a name="284"></a>BorderLayout::sizeHint() const
{
    return cached;
}

<a href="qsize.html">QSize</a> <a name="285"></a>BorderLayout::minimumSize() const
{
    return cached;
}

<a href="qsizepolicy.html#ExpandData">QSizePolicy::ExpandData</a> <a name="286"></a>BorderLayout::expanding() const

{
    return QSizePolicy::BothDirections;
}

<a href="qlayoutiterator.html">QLayoutIterator</a> <a name="287"></a>BorderLayout::iterator()
{
    return QLayoutIterator( new BorderLayoutIterator( &amp;list ) );
}

void <a name="288"></a>BorderLayout::setGeometry( const QRect &amp;rct )
{
    <a href="qlayout.html#f1f752">QLayout::setGeometry</a>( rct );
    <a href=#289>doLayout</a>( rct );
}

void <a name="289"></a>BorderLayout::doLayout( const QRect &amp;rct, bool /*testonly*/ )
{
    int ew = 0, ww = 0, nh = 0, sh = 0;
    int h = 0;

    BorderLayoutIterator it = BorderLayoutIterator( &amp;list );
    BorderLayoutStruct *o;
    BorderLayoutStruct *center = 0;
    while ( ( o = it.currentStruct() ) != 0 ) {
        ++it;

        if ( o-&gt;pos == North ) {
            o-&gt;item-&gt;setGeometry( <a href="qrect.html">QRect</a>( rct.x(), nh, rct.width(), o-&gt;item-&gt;sizeHint().height() ) );
            nh += o-&gt;item-&gt;geometry().height() + spacing();
        }
        if ( o-&gt;pos == South ) {
            o-&gt;item-&gt;setGeometry( <a href="qrect.html">QRect</a>( o-&gt;item-&gt;geometry().x(), o-&gt;item-&gt;geometry().y(),
                                         rct.width(), o-&gt;item-&gt;sizeHint().height() ) );
            sh += o-&gt;item-&gt;geometry().height() + spacing();
            o-&gt;item-&gt;setGeometry( <a href="qrect.html">QRect</a>( rct.x(), rct.y() + rct.height() - sh + spacing(),
                                         o-&gt;item-&gt;geometry().width(), o-&gt;item-&gt;geometry().height() ) );
        }
        if ( o-&gt;pos == Center )
            center = o;
    }

    h = rct.height() - nh - sh;

    it.toFirst();
    while ( ( o = it.currentStruct() ) != 0 ) {
        ++it;

        if ( o-&gt;pos == West ) {
            o-&gt;item-&gt;setGeometry( <a href="qrect.html">QRect</a>( rct.x() + ww, nh, o-&gt;item-&gt;sizeHint().width(), h ) );
            ww += o-&gt;item-&gt;geometry().width() + spacing();
        }
        if ( o-&gt;pos == East ) {
            o-&gt;item-&gt;setGeometry( <a href="qrect.html">QRect</a>( o-&gt;item-&gt;geometry().x(), o-&gt;item-&gt;geometry().y(),
                                         o-&gt;item-&gt;sizeHint().width(), h ) );
            ew += o-&gt;item-&gt;geometry().width() + spacing();
            o-&gt;item-&gt;setGeometry( <a href="qrect.html">QRect</a>( rct.x() + rct.width() - ew + spacing(), nh,
                                         o-&gt;item-&gt;geometry().width(), o-&gt;item-&gt;geometry().height() ) );
        }
    }

    if ( center )
        center-&gt;item-&gt;setGeometry( <a href="qrect.html">QRect</a>( ww, nh, rct.width() - ew - ww, h ) );
}

void <a name="290"></a>BorderLayout::calcSize( SizeType st )
{
    if ( ( st == Minimum &amp;&amp; !msizeDirty ) ||
         ( st == SizeHint &amp;&amp; !sizeDirty ) )
        return;

    int w = 0, h = 0;

    BorderLayoutIterator it = BorderLayoutIterator( &amp;list );
    BorderLayoutStruct *o;
    while ( ( o = it.currentStruct() ) != 0 ) {
        ++it;
        if ( o-&gt;pos == North ||
             o-&gt;pos == South ) {
            if ( st == Minimum )
                h += o-&gt;item-&gt;minimumSize().height();
            else
                h += o-&gt;item-&gt;sizeHint().height();
        }
        else if ( o-&gt;pos == West ||
                  o-&gt;pos == East ) {
            if ( st == Minimum )
                w += o-&gt;item-&gt;minimumSize().width();
            else
                w += o-&gt;item-&gt;sizeHint().width();
        } else {
            if ( st == Minimum ) {
                h += o-&gt;item-&gt;minimumSize().height();
                w += o-&gt;item-&gt;minimumSize().width();
            }
            else {
                h += o-&gt;item-&gt;sizeHint().height();
                w += o-&gt;item-&gt;sizeHint().width();
            }
        }
    }