summaryrefslogtreecommitdiffstats
path: root/interfaces/khexedit/zoominterface.h
blob: 9c6f0f677d059ee5e9d759ace060edf491de9dd3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
/***************************************************************************
                          zoominterface.h  -  description
                             -------------------
    begin                : Fri Sep 12 2003
    copyright            : (C) 2003 by Friedrich W. H. Kossebau
    email                : Friedrich.W.H@Kossebau.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License version 2 as published by the Free Software Foundation.       *
 *                                                                         *
 ***************************************************************************/


#ifndef ZOOMINTERFACE_H
#define ZOOMINTERFACE_H


namespace KHE
{

/**
 * @short A simple interface for zooming
 *
 * This interface enables abstract linear zooming. 
 * It operates in sizes of font point size.
 *
 * @author Friedrich W. H. Kossebau <Friedrich.W.H@Kossebau.de>
 * @see createBytesEditWidget(), zoomInterface()
 * @since 3.2
 */
class ZoomInterface
{
  public:
    /** enlarges the display
      * @param PointInc increment to the display size (in font point size)
      */
    virtual void zoomIn( int PointInc ) = 0;
    /** increases the display size by an arbitrary value, usually 1 font point 
      * @see zoomOut()
      */
    virtual void zoomIn() = 0;
    /** makes the display smaller
      * @param PointDec decrement to the display size (in font point size)
      */
    virtual void zoomOut( int PointDec ) = 0;
    /** decreases the display size by an arbitrary value, usually 1 font point 
      * @see zoomIn()
      */
    virtual void zoomOut() = 0;
    /** sets the display size
      * @param PointSize new display size (in font point size)
      */
    virtual void zoomTo( int PointSize ) = 0;
    /** resets the display to the default size */
    virtual void unZoom() = 0;
};


/** tries to get the zoom interface of t   
  * @return a pointer to the interface, otherwise 0
  * @author Friedrich W. H. Kossebau <Friedrich.W.H@Kossebau.de>
  * @since 3.2
*/
template<class T>
ZoomInterface *zoomInterface( T *t )
{
  if( !t )
    return 0;

  return ::tqqt_cast<KHE::ZoomInterface*>( t );
}

}

#endif