interface/wx/validate.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        validate.h
   3 // Purpose:     interface of wxValidator
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxValidator
  11
  12     wxValidator is the base class for a family of validator classes that
  13     mediate between a class of control, and application data.
  14
  15     A validator has three major roles:
  16
  17     -#  To transfer data from a C++ variable or own storage to and from a
  18         control.
  19     -#  To validate data in a control, and show an appropriate error message.
  20     -#  To filter events (such as keystrokes), thereby changing the behaviour
  21         of the associated control.
  22
  23     Validators can be plugged into controls dynamically.
  24
  25     To specify a default, "null" validator, use ::wxDefaultValidator.
  26
  27     For more information, please see @ref overview_validator.
  28
  29     @beginWxPythonOnly
  30     If you wish to create a validator class in wxPython you should derive the
  31     class from @c wxPyValidator in order to get Python-aware capabilities for
  32     the various virtual methods.
  33     @endWxPythonOnly
  34
  35     @library{wxcore}
  36     @category{validator}
  37
  38     @stdobjects
  39     ::wxDefaultValidator
  40
  41     @see @ref overview_validator, wxTextValidator, wxGenericValidator
  42 */
  43 class wxValidator : public wxEvtHandler
  44 {
  45 public:
  46     /**
  47         Constructor.
  48     */
  49     wxValidator();
  50
  51     /**
  52         Destructor.
  53     */
  54     virtual ~wxValidator();
  55
  56     /**
  57         All validator classes must implement the Clone() function, which
  58         returns an identical copy of itself.
  59
  60         This is because validators are passed to control constructors as
  61         references which must be copied. Unlike objects such as pens and
  62         brushes, it does not make sense to have a reference counting scheme to
  63         do this cloning because all validators should have separate data.
  64
  65         @return This base function returns @NULL.
  66     */
  67     virtual wxObject* Clone() const;
  68
  69     /**
  70         Returns the window associated with the validator.
  71     */
  72     wxWindow* GetWindow() const;
  73
  74     /**
  75         This functions switches on or turns off the error sound produced by the
  76         validators if an invalid key is pressed.
  77     */
  78     static void SetBellOnError(bool doIt = true);
  79
  80     /**
  81         Associates a window with the validator.
  82     */
  83     void SetWindow(wxWindow* window);
  84
  85     /**
  86         This overridable function is called when the value in the window must
  87         be transferred to the validator.
  88
  89         @return @false if there is a problem.
  90     */
  91     virtual bool TransferFromWindow();
  92
  93     /**
  94         This overridable function is called when the value associated with the
  95         validator must be transferred to the window.
  96
  97         @return @false if there is a problem.
  98     */
  99     virtual bool TransferToWindow();
 100
 101     /**
 102         This overridable function is called when the value in the associated
 103         window must be validated.
 104
 105         @return @false if the value in the window is not valid; you may pop up
 106                 an error dialog.
 107     */
 108     virtual bool Validate(wxWindow* parent);
 109 };
 110
 111 /**
 112     An empty, "null" wxValidator instance.
 113 */
 114 wxValidator wxDefaultValidator;
 115