mouse_zoom_handler.hpp

ncbi源码

/*
 * ===========================================================================
 * PRODUCTION $Log: mouse_zoom_handler.hpp,v $
 * PRODUCTION Revision 1000.2  2004/04/12 18:16:34  gouriano
 * PRODUCTION PRODUCTION: UPGRADED [CATCHUP_003] Dev-tree R1.4
 * PRODUCTION
 * ===========================================================================
 */

#ifndef __GUI_WIDGETS_GL___MOUSE_ZOOM_HANDLER__HPP
#define __GUI_WIDGETS_GL___MOUSE_ZOOM_HANDLER__HPP

/*  $Id: mouse_zoom_handler.hpp,v 1000.2 2004/04/12 18:16:34 gouriano Exp $
 * ===========================================================================
 *
 *                            PUBLIC DOMAIN NOTICE
 *               National Center for Biotechnology Information
 *
 *  This software/database is a "United States Government Work" under the
 *  terms of the United States Copyright Act.  It was written as part of
 *  the author's official duties as a United States Government employee and
 *  thus cannot be copyrighted.  This software/database is freely available
 *  to the public for use. The National Library of Medicine and the U.S.
 *  Government have not placed any restriction on its use or reproduction.
 *
 *  Although all reasonable efforts have been taken to ensure the accuracy
 *  and reliability of the software and data, the NLM and the U.S.
 *  Government do not and cannot warrant the performance or results that
 *  may be obtained by using this software or data. The NLM and the U.S.
 *  Government disclaim all warranties, express or implied, including
 *  warranties of performance, merchantability or fitness for any particular
 *  purpose.
 *
 *  Please cite the author in any work or product based on this material.
 *
 * ===========================================================================
 *
 * Authors:  Andrey Yazhuk
 *
 * File Description:
 *
 */

#include <corelib/ncbistl.hpp>

#include <gui/widgets/gl/ievent_handler.hpp>

#include <gui/opengl/glbitmapfont.hpp>
#include <gui/opengl/glpane.hpp>
#include <gui/opengl/glcolor.hpp>

#include <math.h>

BEGIN_NCBI_SCOPE

////////////////////////////////////////////////////////////////////////////////
/// Interface IMouseZoomHandlerHost represents a context in which CMouseZoomHandler
/// functions. 

class NCBI_GUIWIDGETS_GL_EXPORT IMouseZoomHandlerHost
{
public:
    enum EScaleType {
        eMin, /// minimal scale
        eCurrent, /// current scale
        eMax, /// maximal scale
    };

    virtual ~IMouseZoomHandlerHost()    {}

    virtual TModelUnit  MZHH_GetScale(EScaleType type) = 0;
    virtual void        MZHH_SetScale(TModelUnit scale, const TModelPoint& point) = 0;
    virtual void        MZHH_ZoomRect(const TModelRect& rc) = 0;
    virtual void        MZHH_Scroll(TModelUnit d_x, TModelUnit d_y) = 0;

    /// converts FLTK window coord to Viewport coord
    virtual TVPUnit     MZHH_GetVPPosByY(int y) const = 0;
    
    /// redraws the Host and the handler
    virtual void        MZHH_Redraw(void) = 0;
};

////////////////////////////////////////////////////////////////////////////////
/// CMouseZoomHandler is an event handler that allows to zoom its Host component
/// using mouse.
class NCBI_GUIWIDGETS_GL_EXPORT CMouseZoomHandler : public IEventHandler
{
public:
    CMouseZoomHandler();
    virtual ~CMouseZoomHandler();

    void    SetHost(IMouseZoomHandlerHost* pHost);    
    void    Render(CGlPane& Pane);

    /// IEventHandler implementation.
    virtual int     handle(CGUIEvent& event, CGlPane& Pane);    

protected:
    /// user event handlers - translate event to signals
    int x_OnMousePush(CGUIEvent& event);
    int x_OnMouseDrag(CGUIEvent& event);
    int x_OnMouseRelease(CGUIEvent& event);
    int x_OnMouseMove(void);
    int x_OnMouseWheel(CGUIEvent& event);
    int x_OnKeyDown(CGUIEvent& event);
    int x_OnKeyUp(CGUIEvent& event);

    enum    EState {
        eIdle,
        eReadyScale,
        eReadyZoomRect,
        eReadyPan,
        eScale,
        eZoomRect,
        ePan   
    };    

    /// signal handlers - functions doing the real job
    void    x_SwitchToReadyState(EState new_state, int pos_x, int pos_y);
    void    x_SwithToActiveState(EState state, int pos_x, int pos_y);

    void    x_OnChangeScale(int d_y);
    void    x_OnEndScale(EState new_state);
    
    void    x_OnChangeZoomRectPan(int x, int y);
    void    x_OnEndZoomRect(EState new_state);
    void    x_OnEndPan(EState new_state);
    void    x_OnChangePan();
    
protected:
    // helper functions
    void    x_OnSelectCursor(void);

    TModelUnit  x_ScaleToNorm(TModelUnit scale) const;
    TModelUnit  x_NormToScale(TModelUnit norm) const;
    int         x_NormToPixels(TModelUnit norm) const;

    void    x_RenderScale(CGlPane& pane);
    void    x_RenderZoomRect(CGlPane& pane);
    void    x_RenderPan(CGlPane& pane);

    void    x_DrawTicks(int center_x, int y, int tick_w);
    void    x_DrawMarker(int x_c, int y_c, int half);

    const IMouseZoomHandlerHost*    x_GetHost(void) const {   return m_pHost; }
    IMouseZoomHandlerHost*    x_GetHost(void) {   return m_pHost; }

protected:    
    IMouseZoomHandlerHost*  m_pHost;
    CGlPane*    m_pPane;

    EState      m_State;
    Fl_Cursor   m_Cursor;

    // Members used in "Scale" mode
    int m_PixPerNorm;
    TModelUnit  m_MaxNorm;
    TModelUnit  m_MinNorm;
    TModelUnit  m_StartNorm; 
    TModelUnit  m_CurrNorm; // current norm value

    int m_MarkerPosX, m_MarkerPosY; // point where marker is drawn
    
    int m_MouseStartX;
    int m_MouseStartY;
    int m_CurrPosX;
    int m_CurrPosY; // mouse position corresponding to m_CurrNurm;
    TModelPoint m_ptStart; // referrence point for Zoom

    int m_WheelTotalShift;
    
    // scale in logarihtnic units 
    CGlColor    m_ScaleColor;
    CGlColor    m_TickColor;
    CGlColor    m_RectColor;
};


END_NCBI_SCOPE

/*
 * ===========================================================================
 * $Log: mouse_zoom_handler.hpp,v $
 * Revision 1000.2  2004/04/12 18:16:34  gouriano
 * PRODUCTION: UPGRADED [CATCHUP_003] Dev-tree R1.4
 *
 * Revision 1.4  2004/03/04 14:36:12  lebedev
 * Enable panning while mouse drag
 *
 * Revision 1.3  2003/12/10 16:54:16  yazhuk
 * Added support for using mouse position to specify reference point for "active zoom".
 *
 * Revision 1.2  2003/12/01 16:41:44  yazhuk
 * Refactored event handling - introduced CGUIEvent; implemented zooming by
 * rectangle and panoraming.
 *
 * Revision 1.1  2003/11/17 20:23:22  yazhuk
 * Moved from widgets\aln_multiple
 *
 * Revision 1.1  2003/10/20 15:44:47  yazhuk
 * Initial revision.
 *
 * ===========================================================================
 */

#endif  // __GUI_WIDGETS_GL___MOUSE_ZOOM_HANDLER__HPP