/*
 * Copyright 2006, Haiku. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Stephan Aßmus <superstippi@gmx.de>
 */

#ifndef CANVAS_H
#define CANVAS_H

#include <List.h>
#include <Rect.h>
#include <String.h>

struct entry_ref;

class BBitmap;
class BMessage;
class Layer;

class Canvas : private BList {
 public:
                                                                Canvas(BRect frame);
                                                                ~Canvas();

                        bool                            IsValid() const;
                        void                            MakeEmpty();

        // list functionality
                        bool                            AddLayer(Layer* layer);
                        bool                            AddLayer(Layer* layer, int32 index);

                        Layer*                          RemoveLayer(int32 index);
                        bool                            RemoveLayer(Layer* layer);

                        Layer*                          LayerAt(int32 index) const;
                        Layer*                          LayerAtFast(int32 index) const;
                        int32                           IndexOf(Layer* layer) const;
                        int32                           CountLayers() const;
                        bool                            HasLayer(Layer* layer) const;

                        void                            SetBounds(BRect bounds);
                        BRect                           Bounds() const;

                                                                // composes layers on top of passed bitmap
                        void                            Compose(BBitmap* into, BRect area) const;
                                                                // returns entire composition in new bitmap
                        BBitmap*                        Bitmap() const;

        // loading
                        status_t                        Unarchive(const BMessage* archive);

 private:
        BRect                                           fBounds;
};

#endif // CANVAS_H