ctrl_radialslider.hpp

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/*****************************************************************************
 * ctrl_radialslider.hpp
 *****************************************************************************
 * Copyright (C) 2003 the VideoLAN team
 * $Id$
 *
 * Authors: Cyril Deguet     <asmax@via.ecp.fr>
 *          Olivier Teulière <ipkiss@via.ecp.fr>
 *
 * 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 2 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 Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#ifndef CTRL_RADIALSLIDER_HPP
#define CTRL_RADIALSLIDER_HPP

#include "ctrl_generic.hpp"
#include "../utils/fsm.hpp"
#include "../utils/observer.hpp"


class GenericBitmap;
class OSGraphics;
class VarPercent;


/// Radial slider
class CtrlRadialSlider: public CtrlGeneric, public Observer<VarPercent>
{
    public:
        /// Create a radial slider with the given image, which must be
        /// composed of numImg subimages of the same size
        CtrlRadialSlider( intf_thread_t *pIntf, const GenericBitmap &rBmpSeq,
                          int numImg, VarPercent &rVariable, float minAngle,
                          float maxAngle, const UString &rHelp,
                          VarBool *pVisible );

        virtual ~CtrlRadialSlider();

        /// Handle an event
        virtual void handleEvent( EvtGeneric &rEvent );

        /// Check whether coordinates are inside the control
        virtual bool mouseOver( int x, int y ) const;

        /// Draw the control on the given graphics
        virtual void draw( OSGraphics &rImage, int xDest, int yDest );

        /// Get the type of control (custom RTTI)
        virtual string getType() const { return "radial_slider"; }

    private:
        /// Finite state machine of the control
        FSM m_fsm;
        /// Number of sub-images in the slider image
        int m_numImg;
        /// Variable associated to the slider
        VarPercent &m_rVariable;
        /// Min and max angles of the button
        float m_minAngle, m_maxAngle;
        /// Position of the cursor
        int m_position;
        /// Size of an image
        int m_width, m_height;
        /// The last received event
        EvtGeneric *m_pEvt;
        /// Sequence of images
        OSGraphics *m_pImgSeq;
        /// Last saved position
        int m_lastPos;

        /// Callback objects
        DEFINE_CALLBACK( CtrlRadialSlider, UpDown )
        DEFINE_CALLBACK( CtrlRadialSlider, DownUp )
        DEFINE_CALLBACK( CtrlRadialSlider, Move )

        /// Method called when the observed variable is modified
        virtual void onUpdate( Subject<VarPercent> &rVariable, void* );

        /// Change the position of the cursor, with the given position of
        /// the mouse (relative to the layout). Is blocking is true, the
        /// the cursor cannot do more than a half turn
        void setCursor( int posX, int posY, bool blocking );
};


#endif

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