/*
 * Copyright 2006-2007, 2011, Stephan Aßmus <superstippi@gmx.de>
 * All rights reserved. Distributed under the terms of the MIT License.
 */
#ifndef CANVAS_VIEW_H
#define CANVAS_VIEW_H


#include "Icon.h"
#include "Scrollable.h"
#include "StateView.h"


class BBitmap;

_BEGIN_ICON_NAMESPACE
	class IconRenderer;
_END_ICON_NAMESPACE

_USING_ICON_NAMESPACE


enum {
	SNAPPING_OFF	= 0,
	SNAPPING_64,
	SNAPPING_32,
	SNAPPING_16,
};


class CanvasView : public StateView, public Scrollable, public IconListener {
public:
								CanvasView(BRect frame);
	virtual						~CanvasView();

	// StateView interface
	virtual	void				AttachedToWindow();
	virtual	void				FrameResized(float width, float height);
	virtual	void				Draw(BRect updateRect);

	virtual	void				MouseDown(BPoint where);
	virtual	void				MouseUp(BPoint where);
	virtual	void				MouseMoved(BPoint where, uint32 transit,
									const BMessage* dragMessage);
	virtual	void				FilterMouse(BPoint* where) const;

	virtual	bool				MouseWheelChanged(BPoint where,
									float x, float y);

	// Scrollable interface
protected:
	virtual	void				SetScrollOffset(BPoint newOffset);
	virtual	void				ScrollOffsetChanged(BPoint oldOffset,
									BPoint newOffset);
	virtual	void				VisibleSizeChanged(float oldWidth,
									float oldHeight, float newWidth,
									float newHeight);
	// IconListener interface
public:
	virtual	void				AreaInvalidated(const BRect& area);

	// CanvasView
			void				SetIcon(Icon* icon);

	inline	float				ZoomLevel() const
									{ return fZoomLevel; }

			void				SetMouseFilterMode(uint32 mode);
			uint32				MouseFilterMode() const
									{ return fMouseFilterMode; }

			void				ConvertFromCanvas(BPoint* point) const;
			void				ConvertToCanvas(BPoint* point) const;

			void				ConvertFromCanvas(BRect* rect) const;
			void				ConvertToCanvas(BRect* rect) const;

protected:
	// StateView interface
	virtual	bool				_HandleKeyDown(uint32 key, uint32 modifiers);
	virtual	bool				_HandleKeyUp(uint32 key, uint32 modifiers);

	// CanvasView
			BRect				_CanvasRect() const;

			void				_AllocBackBitmap(float width,
												 float height);
			void				_FreeBackBitmap();
			void				_DrawInto(BView* view,
									BRect updateRect);

			void				_MakeBackground();

			void				_UpdateToolCursor();

private:
			double				_NextZoomInLevel(double zoom) const;
			double				_NextZoomOutLevel(double zoom) const;
			void				_SetZoom(double zoomLevel,
									bool mouseIsAnchor = true);
			BRect				_LayoutCanvas();

private:
			BBitmap*			fBitmap;
			BBitmap*			fBackground;

			Icon*				fIcon;
			IconRenderer*		fRenderer;
			BRect				fDirtyIconArea;

			BPoint				fCanvasOrigin;
			double				fZoomLevel;

			bool				fSpaceHeldDown;
			bool				fInScrollTo;
			bool				fScrollTracking;
			BPoint				fScrollTrackingStart;
			BPoint				fScrollOffsetStart;

			uint32				fMouseFilterMode;
};

#endif // CANVAS_VIEW_H