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136 lines
2.8 KiB
136 lines
2.8 KiB
15 years ago
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/****************************************************************************
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** $Id$
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**
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** Implementing your own layout: flow example
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**
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** Copyright (C) 1996 by Trolltech AS. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "flow.h"
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class SimpleFlowIterator :public QGLayoutIterator
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{
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public:
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SimpleFlowIterator( QPtrList<QLayoutItem> *l ) :idx(0), list(l) {}
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uint count() const;
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QLayoutItem *current();
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QLayoutItem *next();
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QLayoutItem *takeCurrent();
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private:
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int idx;
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QPtrList<QLayoutItem> *list;
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};
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uint SimpleFlowIterator::count() const
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{
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return list->count();
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}
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QLayoutItem *SimpleFlowIterator::current()
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{
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return idx < int(count()) ? list->at(idx) : 0;
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}
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QLayoutItem *SimpleFlowIterator::next()
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{
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idx++; return current();
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}
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QLayoutItem *SimpleFlowIterator::takeCurrent()
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{
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return idx < int(count()) ? list->take( idx ) : 0;
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}
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SimpleFlow::~SimpleFlow()
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{
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deleteAllItems();
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}
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int SimpleFlow::heightForWidth( int w ) const
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{
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if ( cached_width != w ) {
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//Not all C++ compilers support "mutable" yet:
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SimpleFlow * mthis = (SimpleFlow*)this;
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int h = mthis->doLayout( QRect(0,0,w,0), TRUE );
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mthis->cached_hfw = h;
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mthis->cached_width = w;
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return h;
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}
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return cached_hfw;
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}
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void SimpleFlow::addItem( QLayoutItem *item)
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{
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list.append( item );
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}
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bool SimpleFlow::hasHeightForWidth() const
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{
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return TRUE;
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}
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QSize SimpleFlow::sizeHint() const
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{
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return minimumSize();
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}
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QSizePolicy::ExpandData SimpleFlow::expanding() const
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{
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return QSizePolicy::NoDirection;
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}
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QLayoutIterator SimpleFlow::iterator()
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{
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return QLayoutIterator( new SimpleFlowIterator( &list ) );
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}
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void SimpleFlow::setGeometry( const QRect &r )
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{
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QLayout::setGeometry( r );
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doLayout( r );
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}
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int SimpleFlow::doLayout( const QRect &r, bool testonly )
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{
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int x = r.x();
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int y = r.y();
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int h = 0; //height of this line so far.
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QPtrListIterator<QLayoutItem> it(list);
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QLayoutItem *o;
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while ( (o=it.current()) != 0 ) {
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++it;
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int nextX = x + o->sizeHint().width() + spacing();
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if ( nextX - spacing() > r.right() && h > 0 ) {
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x = r.x();
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y = y + h + spacing();
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nextX = x + o->sizeHint().width() + spacing();
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h = 0;
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}
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if ( !testonly )
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o->setGeometry( QRect( QPoint( x, y ), o->sizeHint() ) );
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x = nextX;
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h = QMAX( h, o->sizeHint().height() );
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}
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return y + h - r.y();
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}
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QSize SimpleFlow::minimumSize() const
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{
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QSize s(0,0);
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QPtrListIterator<QLayoutItem> it(list);
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QLayoutItem *o;
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while ( (o=it.current()) != 0 ) {
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++it;
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s = s.expandedTo( o->minimumSize() );
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}
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return s;
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}
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