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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 TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "flow.h"
class SimpleFlowIterator :public TQGLayoutIterator
{
public:
SimpleFlowIterator( TQPtrList<TQLayoutItem> *l ) :idx(0), list(l) {}
uint count() const;
TQLayoutItem *current();
TQLayoutItem *next();
TQLayoutItem *takeCurrent();
private:
int idx;
TQPtrList<TQLayoutItem> *list;
};
uint SimpleFlowIterator::count() const
{
return list->count();
}
TQLayoutItem *SimpleFlowIterator::current()
{
return idx < int(count()) ? list->at(idx) : 0;
}
TQLayoutItem *SimpleFlowIterator::next()
{
idx++; return current();
}
TQLayoutItem *SimpleFlowIterator::takeCurrent()
{
return idx < int(count()) ? list->take( idx ) : 0;
}
SimpleFlow::~SimpleFlow()
{
deleteAllItems();
}
int SimpleFlow::heightForWidth( int w ) const
{
if ( cached_width != w ) {
//Not all C++ compilers support "mutable" yet:
SimpleFlow * mthis = (SimpleFlow*)this;
int h = mthis->doLayout( TQRect(0,0,w,0), TRUE );
mthis->cached_hfw = h;
mthis->cached_width = w;
return h;
}
return cached_hfw;
}
void SimpleFlow::addItem( TQLayoutItem *item)
{
list.append( item );
}
bool SimpleFlow::hasHeightForWidth() const
{
return TRUE;
}
TQSize SimpleFlow::sizeHint() const
{
return minimumSize();
}
TQSizePolicy::ExpandData SimpleFlow::expanding() const
{
return TQSizePolicy::NoDirection;
}
TQLayoutIterator SimpleFlow::iterator()
{
return TQLayoutIterator( new SimpleFlowIterator( &list ) );
}
void SimpleFlow::setGeometry( const TQRect &r )
{
TQLayout::setGeometry( r );
doLayout( r );
}
int SimpleFlow::doLayout( const TQRect &r, bool testonly )
{
int x = r.x();
int y = r.y();
int h = 0; //height of this line so far.
TQPtrListIterator<TQLayoutItem> it(list);
TQLayoutItem *o;
while ( (o=it.current()) != 0 ) {
++it;
int nextX = x + o->sizeHint().width() + spacing();
if ( nextX - spacing() > r.right() && h > 0 ) {
x = r.x();
y = y + h + spacing();
nextX = x + o->sizeHint().width() + spacing();
h = 0;
}
if ( !testonly )
o->setGeometry( TQRect( TQPoint( x, y ), o->sizeHint() ) );
x = nextX;
h = TQMAX( h, o->sizeHint().height() );
}
return y + h - r.y();
}
TQSize SimpleFlow::minimumSize() const
{
TQSize s(0,0);
TQPtrListIterator<TQLayoutItem> it(list);
TQLayoutItem *o;
while ( (o=it.current()) != 0 ) {
++it;
s = s.expandedTo( o->minimumSize() );
}
return s;
}
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