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/****************************************************************************
**
** Implementing your own layout: flow example
**
** Copyright (C) 1996-2008 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 QGLayoutIterator
{
public:
BorderLayoutIterator( const QPtrList<BorderLayout::BorderLayoutStruct> *l )
: idx( 0 ) , list( (QPtrList<BorderLayout::BorderLayoutStruct>*)l )
{}
uint count() const;
QLayoutItem *current();
BorderLayout::BorderLayoutStruct *currentStruct();
void toFirst();
QLayoutItem *next();
QLayoutItem *takeCurrent();
BorderLayoutIterator &operator++();
private:
int idx;
QPtrList<BorderLayout::BorderLayoutStruct> *list;
};
uint BorderLayoutIterator::count() const
{
return list->count();
}
QLayoutItem *BorderLayoutIterator::current()
{
return idx < (int)count() ? list->at( idx )->item : 0;
}
BorderLayout::BorderLayoutStruct *BorderLayoutIterator::currentStruct()
{
return idx < (int)count() ? list->at( idx ) : 0;
}
void BorderLayoutIterator::toFirst()
{
idx = 0;
}
QLayoutItem *BorderLayoutIterator::next()
{
idx++;
return current();
}
QLayoutItem *BorderLayoutIterator::takeCurrent()
{
BorderLayout::BorderLayoutStruct *b
= idx < int( list->count() ) ? list->take( idx ) : 0;
QLayoutItem *item = b ? b->item : 0;
delete b;
return item;
}
BorderLayoutIterator &BorderLayoutIterator::operator++()
{
next();
return *this;
}
BorderLayout::~BorderLayout()
{
deleteAllItems();
}
void BorderLayout::addItem( QLayoutItem *item )
{
add( item, West );
}
void BorderLayout::addWidget( QWidget *widget, Position pos )
{
add( new BorderWidgetItem( widget ), pos );
}
void BorderLayout::add( QLayoutItem *item, Position pos )
{
list.append( new BorderLayoutStruct( item, pos ) );
sizeDirty = TRUE; msizeDirty = TRUE;
calcSize( SizeHint ); calcSize( Minimum );
}
bool BorderLayout::hasHeightForWidth() const
{
return FALSE;
}
QSize BorderLayout::sizeHint() const
{
return cached;
}
QSize BorderLayout::minimumSize() const
{
return cached;
}
QSizePolicy::ExpandData BorderLayout::expanding() const
{
return QSizePolicy::BothDirections;
}
QLayoutIterator BorderLayout::iterator()
{
return QLayoutIterator( new BorderLayoutIterator( &list ) );
}
void BorderLayout::setGeometry( const QRect &rct )
{
QLayout::setGeometry( rct );
doLayout( rct );
}
void BorderLayout::doLayout( const QRect &rct, bool /*testonly*/ )
{
int ew = 0, ww = 0, nh = 0, sh = 0;
int h = 0;
BorderLayoutIterator it( &list );
BorderLayoutStruct *o;
BorderLayoutStruct *center = 0;
while ( ( o = it.currentStruct() ) != 0 ) {
++it;
if ( o->pos == North ) {
o->item->setGeometry( QRect( rct.x(), nh, rct.width(), o->item->sizeHint().height() ) );
nh += o->item->geometry().height() + spacing();
}
if ( o->pos == South ) {
o->item->setGeometry( QRect( o->item->geometry().x(), o->item->geometry().y(),
rct.width(), o->item->sizeHint().height() ) );
sh += o->item->geometry().height() + spacing();
o->item->setGeometry( QRect( rct.x(), rct.y() + rct.height() - sh + spacing(),
o->item->geometry().width(), o->item->geometry().height() ) );
}
if ( o->pos == Center )
center = o;
}
h = rct.height() - nh - sh;
it.toFirst();
while ( ( o = it.currentStruct() ) != 0 ) {
++it;
if ( o->pos == West ) {
o->item->setGeometry( QRect( rct.x() + ww, nh, o->item->sizeHint().width(), h ) );
ww += o->item->geometry().width() + spacing();
}
if ( o->pos == East ) {
o->item->setGeometry( QRect( o->item->geometry().x(), o->item->geometry().y(),
o->item->sizeHint().width(), h ) );
ew += o->item->geometry().width() + spacing();
o->item->setGeometry( QRect( rct.x() + rct.width() - ew + spacing(), nh,
o->item->geometry().width(), o->item->geometry().height() ) );
}
}
if ( center )
center->item->setGeometry( QRect( ww, nh, rct.width() - ew - ww, h ) );
}
void BorderLayout::calcSize( SizeType st )
{
if ( ( st == Minimum && !msizeDirty ) ||
( st == SizeHint && !sizeDirty ) )
return;
int w = 0, h = 0;
BorderLayoutIterator it( &list );
BorderLayoutStruct *o;
while ( ( o = it.currentStruct() ) != 0 ) {
++it;
if ( o->pos == North ||
o->pos == South ) {
if ( st == Minimum )
h += o->item->minimumSize().height();
else
h += o->item->sizeHint().height();
}
else if ( o->pos == West ||
o->pos == East ) {
if ( st == Minimum )
w += o->item->minimumSize().width();
else
w += o->item->sizeHint().width();
} else {
if ( st == Minimum ) {
h += o->item->minimumSize().height();
w += o->item->minimumSize().width();
}
else {
h += o->item->sizeHint().height();
w += o->item->sizeHint().width();
}
}
}
if ( st == Minimum ) {
msizeDirty = FALSE;
mcached = QSize( w, h );
} else {
sizeDirty = FALSE;
cached = QSize( w, h );
}
return;
}
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