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tdetoys/kworldwatch/flow.cpp

136 lines
2.8 KiB

/****************************************************************************
** $Id$
**
** 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 "flow.h"
class SimpleFlowIterator :public QGLayoutIterator
{
public:
SimpleFlowIterator( QPtrList<QLayoutItem> *l ) :idx(0), list(l) {}
uint count() const;
QLayoutItem *current();
QLayoutItem *next();
QLayoutItem *takeCurrent();
private:
int idx;
QPtrList<QLayoutItem> *list;
};
uint SimpleFlowIterator::count() const
{
return list->count();
}
QLayoutItem *SimpleFlowIterator::current()
{
return idx < int(count()) ? list->at(idx) : 0;
}
QLayoutItem *SimpleFlowIterator::next()
{
idx++; return current();
}
QLayoutItem *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( QRect(0,0,w,0), TRUE );
mthis->cached_hfw = h;
mthis->cached_width = w;
return h;
}
return cached_hfw;
}
void SimpleFlow::addItem( QLayoutItem *item)
{
list.append( item );
}
bool SimpleFlow::hasHeightForWidth() const
{
return TRUE;
}
QSize SimpleFlow::sizeHint() const
{
return minimumSize();
}
QSizePolicy::ExpandData SimpleFlow::expanding() const
{
return QSizePolicy::NoDirection;
}
QLayoutIterator SimpleFlow::iterator()
{
return QLayoutIterator( new SimpleFlowIterator( &list ) );
}
void SimpleFlow::setGeometry( const QRect &r )
{
QLayout::setGeometry( r );
doLayout( r );
}
int SimpleFlow::doLayout( const QRect &r, bool testonly )
{
int x = r.x();
int y = r.y();
int h = 0; //height of this line so far.
QPtrListIterator<QLayoutItem> it(list);
QLayoutItem *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( QRect( QPoint( x, y ), o->sizeHint() ) );
x = nextX;
h = QMAX( h, o->sizeHint().height() );
}
return y + h - r.y();
}
QSize SimpleFlow::minimumSize() const
{
QSize s(0,0);
QPtrListIterator<QLayoutItem> it(list);
QLayoutItem *o;
while ( (o=it.current()) != 0 ) {
++it;
s = s.expandedTo( o->minimumSize() );
}
return s;
}