item.h

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// -*- C++ -*-

/*
 * Gnome Chemistry Utils
 * gccv/item.h
 *
 * Copyright (C) 2008-2010 Jean Bréfort <jean.brefort@normalesup.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */

#ifndef GCCV_ITEM_H
#define GCCV_ITEM_H

#include <gcu/macros.h>
#include <cairo.h>

#define GCCV_ITEM_PROP(type,member) \
public: \
        void Set##member (type val) {   \
                m_##member = val;       \
                Invalidate ();  \
        }       \
        type Get##member (void) const {return m_##member;}      \
private:        \
        type m_##member;

#define GCCV_ITEM_POS_PROP(type,member) \
public: \
        void Set##member (type val) {   \
                Invalidate ();  \
                m_##member = val;       \
                BoundsChanged ();       \
                Invalidate ();  \
        }       \
        type Get##member (void) const {return m_##member;}      \
private:        \
        type m_##member;

namespace gccv {

class Canvas;
class Group;
class ItemClient;

class Item
{
public:
        Item (Canvas *canvas);
        Item (Group *parent, ItemClient *client = NULL);
        virtual ~Item ();

        void GetBounds (double &x0, double &y0, double &x1, double &y1) const;
        void Invalidate () const;
        void SetVisible (bool visible);

        // virtual methods
        virtual double Distance (double x, double y, Item **item) const;
        virtual void BuildPath (cairo_t *cr) const;
        virtual void Draw (cairo_t *cr, bool is_vector) const;
        virtual bool Draw (cairo_t *cr, double x0, double y0, double x1, double y1, bool is_vector) const;
        virtual void Move (double x, double y);
        bool IsTopLevel () const;

protected:
        void BoundsChanged ();
        virtual void UpdateBounds ();
        Canvas const *GetCanvas () const {return m_Canvas;}

protected:
        double m_x0;
        double m_y0;
        double m_x1;
        double m_y1;

private:
        Canvas *m_Canvas;
        bool m_CachedBounds;
        bool m_NeedsRedraw;

GCU_POINTER_PROP (ItemClient, Client)
GCU_RO_POINTER_PROP (Group, Parent)
GCU_RO_PROP (bool, Visible)
GCCV_ITEM_PROP (cairo_operator_t, Operator);
};

}

#endif  //       GCCV_ITEM_H