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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: wx/validate.h
3 // Purpose: wxValidator class
4 // Author: Julian Smart
5 // Modified by:
6 // Created: 29/01/98
7 // RCS-ID: $Id$
8 // Copyright: (c) 1998 Julian Smart
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 #ifndef _WX_VALIDATE_H_
13 #define _WX_VALIDATE_H_
14
15 #include "wx/defs.h"
16
17 #if wxUSE_VALIDATORS
18
19 #include "wx/event.h"
20
21 class WXDLLEXPORT wxWindow;
22 class WXDLLEXPORT wxWindowBase;
23
24 /*
25 A validator has up to three purposes:
26
27 1) To validate the data in the window that's associated
28 with the validator.
29 2) To transfer data to and from the window.
30 3) To filter input, using its role as a wxEvtHandler
31 to intercept e.g. OnChar.
32
33 Note that wxValidator and derived classes use reference counting.
34 */
35
36 class WXDLLEXPORT wxValidator : public wxEvtHandler
37 {
38 public:
39 wxValidator();
40 virtual ~wxValidator();
41
42 // Make a clone of this validator (or return NULL) - currently necessary
43 // if you're passing a reference to a validator.
44 // Another possibility is to always pass a pointer to a new validator
45 // (so the calling code can use a copy constructor of the relevant class).
46 virtual wxObject *Clone() const
47 { return (wxValidator *)NULL; }
48 bool Copy(const wxValidator& val)
49 { m_validatorWindow = val.m_validatorWindow; return true; }
50
51 // Called when the value in the window must be validated.
52 // This function can pop up an error message.
53 virtual bool Validate(wxWindow *WXUNUSED(parent)) { return false; }
54
55 // Called to transfer data to the window
56 virtual bool TransferToWindow() { return false; }
57
58 // Called to transfer data from the window
59 virtual bool TransferFromWindow() { return false; }
60
61 // accessors
62 wxWindow *GetWindow() const { return (wxWindow *)m_validatorWindow; }
63 void SetWindow(wxWindowBase *win) { m_validatorWindow = win; }
64
65 // validators beep by default if invalid key is pressed, these functions
66 // allow to change it
67 static bool IsSilent() { return ms_isSilent; }
68 static void SetBellOnError(bool doIt = true) { ms_isSilent = doIt; }
69
70 protected:
71 wxWindowBase *m_validatorWindow;
72
73 private:
74 static bool ms_isSilent;
75
76 DECLARE_DYNAMIC_CLASS(wxValidator)
77 DECLARE_NO_COPY_CLASS(wxValidator)
78 };
79
80 extern WXDLLEXPORT_DATA(const wxValidator) wxDefaultValidator;
81
82 #define wxVALIDATOR_PARAM(val) val
83
84 #else // !wxUSE_VALIDATORS
85 // wxWidgets is compiled without support for wxValidator, but we still
86 // want to be able to pass wxDefaultValidator to the functions which take
87 // a wxValidator parameter to avoid using "#if wxUSE_VALIDATORS"
88 // everywhere
89 class WXDLLEXPORT wxValidator;
90 #define wxDefaultValidator (*((wxValidator *)NULL))
91
92 // this macro allows to avoid warnings about unused parameters when
93 // wxUSE_VALIDATORS == 0
94 #define wxVALIDATOR_PARAM(val)
95 #endif // wxUSE_VALIDATORS/!wxUSE_VALIDATORS
96
97 #endif // _WX_VALIDATE_H_
98