/*
 * Copyright 2006-2012 Stephan Aßmus <superstippi@gmx.de>
 * Distributed under the terms of the MIT License.
 */

#ifndef ALPHA_SLIDER_H
#define ALPHA_SLIDER_H

#include <Control.h>

class AlphaSlider : public BControl {
public:
                                                                AlphaSlider(orientation dir = B_HORIZONTAL,
                                                                        BMessage* message = NULL,
                                                                        border_style border = B_FANCY_BORDER);
        virtual                                         ~AlphaSlider();

        // BControl interface
        virtual void                            WindowActivated(bool active);
        virtual void                            MakeFocus(bool focus);

        virtual BSize                           MinSize();
        virtual BSize                           PreferredSize();
        virtual BSize                           MaxSize();

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

        virtual void                            KeyDown(const char* bytes, int32 numBytes);

        virtual void                            Draw(BRect updateRect);
        virtual void                            FrameResized(float width, float height);

        virtual void                            SetValue(int32 value);
        virtual void                            SetEnabled(bool enabled);

        // AlphaSlider
                        void                            SetColor(const rgb_color& color);

                        bool                            IsTracking() const
                                                                        { return fDragging; }

private:
                        void                            _UpdateColors();
                        void                            _AllocBitmap(int32 width, int32 height);
                        BRect                           _BitmapRect() const;
                        int32                           _ValueFor(BPoint where) const;

private:
                        BBitmap*                        fBitmap;
                        rgb_color                       fColor;
                        bool                            fDragging;
                        orientation                     fOrientation;
                        border_style            fBorderStyle;
};

#endif // ALPHA_SLIDER_H