borderlayer.h

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//--- < BORDERLAYER.H > ---------| ViewGraph - A Flexible Graph view Framework |
//
// The border layer provides scrolling
// event generation and cursor shape 
// changes. Insert this layer first 
// in the layer list to catch mousemove
// events.
// 
// $Author: botik32 $
// $Revision: 1.2 $
// $Date: 2004/06/03 10:33:31 $
//-----------------------------------------------------------------------------/

#ifndef BORDERLAYER_H
#define BORDERLAYER_H

#include <cZUI/layernode.h>

class SurfaceCursor;

/// DefaultScrollPolicy is totally relaxed
/// returning true everytime
class DefaultScrollPolicy
{
public:
        static bool validate_scroll( Camera *, double xscroll,
                double yscroll );
};

/// LimitScrollPolicy limits the scroll so
/// the scene is present in X percent of the
/// shown area, both on X and Y axes.
template<int required_percentage>
class LimitScrollPolicy
{
public:
        static bool validate_scroll( Camera *, double xscroll,
                double yscroll );
};

template<class SP>
class BorderLayer : public LayerNode
{
protected:
        SurfaceCursor *scrollcursor_left;       
        SurfaceCursor *scrollcursor_right;      
        SurfaceCursor *scrollcursor_up; 
        SurfaceCursor *scrollcursor_down;       
        SurfaceCursor *scrollcursor_leftup;     
        SurfaceCursor *scrollcursor_rightup;    
        SurfaceCursor *scrollcursor_leftdown;   
        SurfaceCursor *scrollcursor_rightdown;  
        double leftzone, rightzone, topzone, 
                bottomzone;
        double leftsz, rightsz, topsz, bottomsz;
        SurfaceCursor *normalcursor;

        // count of consecutive scroll events 
        // received
        int scrollcount;
public:
        BorderLayer( Camera *, int zonewidth, 
                        SurfaceCursor* scrollcursor,
                        SurfaceCursor* normalc );       
        BorderLayer( Camera *, int lz, int rz, 
                        int uz, int bz, SurfaceCursor*,
                        SurfaceCursor* normalc );       
        BorderLayer( Camera *, int zonewidth, 
                        SurfaceCursor* scleft, SurfaceCursor *scright, 
                        SurfaceCursor *scup, SurfaceCursor *scdown,
                        SurfaceCursor* scleftup, SurfaceCursor *scrightup, 
                        SurfaceCursor *scleftdown, SurfaceCursor *scrightdown,
                        SurfaceCursor* normalc );       
        BorderLayer( Camera *, int lz, int rz, int uz, int bz, 
                        SurfaceCursor* scleft, SurfaceCursor *scright, 
                        SurfaceCursor *scup, SurfaceCursor *scdown,
                        SurfaceCursor* scleftup, SurfaceCursor *scrightup, 
                        SurfaceCursor *scleftdown, SurfaceCursor *scrightdown,
                        SurfaceCursor* normalc );       

        bool handle_event( Event *e );
        void get_boundrect( double&, double&, double&, double& );
};

#endif

/// $Log: borderlayer.h,v $
/// Revision 1.2  2004/06/03 10:33:31  botik32
/// Added one more include to cZUI.h and definition of ABS
/// Moved borderlayer to include dir and made it configurable
/// using templates
///
/// Revision 1.1.1.1  2004/03/26 10:50:26  botik32
/// Initial release
///
/// Revision 1.1.1.1  2004/03/26 08:53:33  botik
/// initial import
///
///
/// Revision 1.7  2003/11/24 16:12:10  botik
/// Halfway through major redesign of a view's geometric
/// parameters. This will influence zooming and repainting.
///
/// Revision 1.6  2003/11/20 18:40:48  botik
/// Got borderlayer to work satisfactory.
/// Changed xpsdl driver to check bounds
/// on rect update and clear
///
/// Revision 1.5  2003/11/20 14:59:13  botik
/// Added TimedEvent and TimedEventManager class.
/// These will allow us to (hopefully) fix the
/// borderlayer scrolling which sucks badly.
///
/// Revision 1.4  2003/11/18 13:53:45  botik
/// Fixed the annoying bug where + scrolling was faster
/// than -.
///
/// Revision 1.3  2003/11/12 12:04:27  botik
/// Further refinements of contrib/borderlayer,
/// added inner event generation to view and surface
/// classes,
/// a few minor bugfixes
///
/// Revision 1.2  2003/11/09 18:05:37  botik
/// Contrib/borderlayer works! Fixed a lot of small bugs.
///
/// Revision 1.1  2003/11/08 19:27:03  botik
/// Added borderlayer
///

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