include/wx/validate.h

   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 WXDLLIMPEXP_FWD_CORE wxWindow;
  22 class WXDLLIMPEXP_FWD_CORE 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 WXDLLIMPEXP_CORE 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 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     wxDECLARE_NO_COPY_CLASS(wxValidator);
  78 };
  79
  80 extern WXDLLIMPEXP_DATA_CORE(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 WXDLLIMPEXP_FWD_CORE wxValidator;
  90     #define wxDefaultValidator (*reinterpret_cast<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