docs/latex/wx/validatr.tex

   1 \section{\class{wxValidator}}\label{wxvalidator}
   2
   3 wxValidator is the base class for a family of validator classes that mediate
   4 between a class of control, and application data.
   5
   6 A validator has three major roles:
   7
   8 \begin{enumerate}\itemsep=0pt
   9 \item to transfer data from a C++ variable or own storage to and from a control;
  10 \item to validate data in a control, and show an appropriate error message;
  11 \item to filter events (such as keystrokes), thereby changing the behaviour of the
  12 associated control.
  13 \end{enumerate}
  14
  15 Validators can be plugged into controls dynamically.
  16
  17 To specify a default, `null' validator, use the symbol {\bf wxDefaultValidator}.
  18
  19 For more information, please see \helpref{Validator overview}{validatoroverview}.
  20
  21 \wxheading{Derived from}
  22
  23 \helpref{wxEvtHandler}{wxevthandler}\\
  24 \helpref{wxObject}{wxobject}
  25
  26 \wxheading{See also}
  27
  28 \helpref{Validator overview}{validatoroverview}, \helpref{wxTextValidator}{wxtextvalidator}
  29
  30 \latexignore{\rtfignore{\wxheading{Members}}}
  31
  32 \membersection{wxValidator::wxValidator}\label{wxvalidatorconstr}
  33
  34 \func{}{wxValidator}{\void}
  35
  36 Constructor.
  37
  38 \membersection{wxValidator::\destruct{wxValidator}}
  39
  40 \func{}{\destruct{wxValidator}}{\void}
  41
  42 Destructor.
  43
  44 \membersection{wxValidator::Clone}\label{wxvalidatorclone}
  45
  46 \constfunc{virtual wxValidator*}{Clone}{\void}
  47
  48 All validator classes must implement the {\bf Clone} function, which returns
  49 an identical copy of itself. This is because validators are passed to control
  50 constructors as references which must be copied. Unlike objects such as pens
  51 and brushes, it does not make sense to have a reference counting scheme
  52 to do this cloning, because all validators should have separate
  53 data.
  54
  55 This base function returns NULL.
  56
  57 \membersection{wxValidator::GetWindow}\label{wxvalidatorgetwindow}
  58
  59 \constfunc{wxWindow*}{GetWindow}{\void}
  60
  61 Returns the window associated with the validator.
  62
  63 \membersection{wxValidator::SetWindow}\label{wxvalidatorsetwindow}
  64
  65 \func{void}{SetWindow}{\param{wxWindow*}{ window}}
  66
  67 Associates a window with the validator.
  68
  69 \membersection{wxValidator::TransferFromWindow}\label{wxvalidatortransferfromwindow}
  70
  71 \func{virtual bool}{TransferToWindow}{\param{wxWindow*}{ parent}}
  72
  73 This overridable function is called when the value in the window must be
  74 transferred to the validator. Return FALSE if there is a problem.
  75
  76 \membersection{wxValidator::TransferToWindow}\label{wxvalidatortransfertowindow}
  77
  78 \func{virtual bool}{TransferToWindow}{\param{wxWindow*}{ parent}}
  79
  80 This overridable function is called when the value associated with the validator must be
  81 transferred to the window. Return FALSE if there is a problem.
  82
  83 \membersection{wxValidator::Validate}\label{wxvalidatorvalidate}
  84
  85 \func{virtual bool}{Validate}{\param{wxWindow*}{ parent}}
  86
  87 This overridable function is called when the value in the associated window must be validated.
  88 Return FALSE if the value in the window is not valid; you may pop up an error dialog.
  89
  90