/
isizerule.h
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/
isizerule.h
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/** @file isizerule.h Interface for objects providing size rules.
*
* @authors Copyright (c) 2017 Jaakko Keränen <jaakko.keranen@iki.fi>
*
* @par License
* LGPL: http://www.gnu.org/licenses/lgpl.html
*
* <small>This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at your
* option) any later version. This program is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details. You should have received a copy of
* the GNU Lesser General Public License along with this program; if not, see:
* http://www.gnu.org/licenses</small>
*/
#ifndef LIBDENG2_ISIZERULE_H
#define LIBDENG2_ISIZERULE_H
#include "../Rule"
namespace de {
/**
* Interface for objects providing size rules.
* @ingroup widgets
*/
class DENG2_PUBLIC ISizeRule
{
public:
virtual ~ISizeRule() {}
virtual Rule const &width() const = 0;
virtual Rule const &height() const = 0;
};
/**
* Pair of rules that implements the ISizeRule interface.
* @ingroup widgets
*/
struct DENG2_PUBLIC RulePair
: public std::pair<const Rule &, const Rule &>
, public ISizeRule {
RulePair(const Rule &a, const Rule &b)
: std::pair<const Rule &, const Rule &>(a, b)
{}
// Implements ISizeRule.
const Rule &width() const override
{
return first;
}
const Rule &height() const override
{
return second;
}
};
} // namespace de
#endif // LIBDENG2_ISIZERULE_H