/*
 * Copyright 2006-2010, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 */
#ifndef	_LAYOUT_H
#define	_LAYOUT_H


#include <Alignment.h>
#include <Archivable.h>
#include <List.h>
#include <Size.h>


class BLayoutItem;
class BView;


class BLayout : public BArchivable {
public:
								BLayout();
								BLayout(BMessage* archive);
	virtual						~BLayout();

			BView*				View() const;

	virtual	BLayoutItem*		AddView(BView* child);
	virtual	BLayoutItem*		AddView(int32 index, BView* child);

	virtual	bool				AddItem(BLayoutItem* item);
	virtual	bool				AddItem(int32 index, BLayoutItem* item);

	virtual	bool				RemoveView(BView* child);
	virtual	bool				RemoveItem(BLayoutItem* item);
	virtual	BLayoutItem*		RemoveItem(int32 index);

			BLayoutItem*		ItemAt(int32 index) const;
			int32				CountItems() const;
			int32				IndexOfItem(const BLayoutItem* item) const;
			int32				IndexOfView(BView* child) const;

	virtual	BSize				MinSize() = 0;
	virtual	BSize				MaxSize() = 0;
	virtual	BSize				PreferredSize() = 0;
	virtual	BAlignment			Alignment() = 0;

	virtual	bool				HasHeightForWidth() = 0;
	virtual	void				GetHeightForWidth(float width, float* min,
									float* max, float* preferred) = 0;

	virtual	void				InvalidateLayout();

	virtual	void				LayoutView() = 0;

	virtual status_t			Archive(BMessage* into, bool deep = true) const;
	virtual	status_t			AllUnarchived(const BMessage* from);

	virtual status_t			ItemArchived(BMessage* into, BLayoutItem* item,
									int32 index) const;
	virtual	status_t			ItemUnarchived(const BMessage* from,
									BLayoutItem* item, int32 index);
protected:
	virtual	bool				ItemAdded(BLayoutItem* item, int32 atIndex);
	virtual	void				ItemRemoved(BLayoutItem* item, int32 fromIndex);

private:
			friend class BView;

			void				SetView(BView* view);

			BView*				fView;
			BList				fItems;
};


#endif	//	_LAYOUT_H