sizepolicy.h

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/*
  libwt - Vassilis Virvilis Toolkit - a widget library
  Copyright (C) 2006 Vassilis Virvilis <vasvir2@fastmail.fm>
 
  This library 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 2.1 of the License, or (at your option) any later version.
  
  This library 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 library; if not, write to the
  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  Boston, MA  02111-1307, SA.
*/

#ifndef WT_SIZEPOLICY_H
#define WT_SIZEPOLICY_H

#include <wt/wvar.h>

namespace Wt {

class SizePolicy {
protected:
    typedef enum {
        MayGrow = 1 << 0,
        MayShrink = 1 << 1,
        ExpMask = 1 << 2
    } SizePolicyFlags;

    typedef enum {
        Horizontally = 1 << 0,
        Vertically = 1 << 1
    } ExpandDataFlags;

public:
    /// SizePolicy types
    typedef enum {
        Fixed = 0,
        Minimum = MayGrow,
        Maximum = MayShrink,
        Preferred = MayGrow | MayShrink,
        MinimumExpanding = MayGrow | ExpMask,
        Expanding = MayGrow | MayShrink | ExpMask,
        Ignored = ExpMask
    } SizeType;

    typedef enum {
        NoDirection = 0,
        Horizontal = Horizontally,
        Vertical = Vertically,
        BothDirections = Horizontally | Vertically
    } ExpandData;

    SizePolicy() :
            horizontallData(Preferred),
            verticalData(Preferred),
            expandData(BothDirections),
            heightForWidth(false),
            horizontalStretch(0),
    verticalStretch(0) {}

    SizePolicy(SizeType hor, SizeType ver, bool hfw = false) :
            horizontallData(hor),
            verticalData(ver),
            expandData(BothDirections),
            heightForWidth(hfw),
            horizontalStretch(0),
    verticalStretch(0) {}

    SizePolicy(SizeType hor, SizeType ver,
               unsigned char horStretch, unsigned char verStretch, bool hfw = false) :
            horizontallData(hor),
            verticalData(ver),
            expandData(BothDirections),
            heightForWidth(hfw),
            horizontalStretch(horStretch),
    verticalStretch(verStretch) {}

    bool mayShrinkHorizontally() const {
        return (horizontallData & MayShrink) && (expandData & Horizontally);
    }
    bool mayShrinkVertically() const {
        return (verticalData & MayShrink) && (expandData & Vertically);
    };
    bool mayGrowHorizontally() const {
        return (horizontallData & MayGrow) && (expandData & Horizontally);
    }
    bool mayGrowVertically() const {
        return (verticalData & MayGrow) && (expandData & Vertically);
    };

    bool expandingHorizontally() const {
        return (horizontallData & ExpMask) && (expandData & Horizontally);
    }
    bool expandingVertically() const {
        return (verticalData & ExpMask) && (expandData & Vertically);
    };

    bool operator==(const SizePolicy& other) const {
        return horizontallData == other.horizontallData &&
               verticalData == other.verticalData &&
               expandData == other.expandData &&
               heightForWidth == other.heightForWidth &&
               horizontalStretch == other.horizontalStretch &&
               verticalStretch == other.verticalStretch;
    }

    WVar<int> horizontallData;
    WVar<int> verticalData;
    WVar<ExpandData> expandData;
    WVar<bool> heightForWidth;
    WVar<unsigned char> horizontalStretch;
    WVar<unsigned char> verticalStretch;
};

}

#endif // WT_SIZEPOLICY_H

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Generated Fri Jul 28 19:23:01 2006.
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