bfcd51cb6a
Allow overriding the method called when the validator is associated with the window, this can be convenient to perform some initialization on the validator instance actually used as it can't be done on the initially created object itself because it will be cloned by SetValidator(), creating a new instance. Also change SetWindow() to take wxWindow instead of wxWindowBase, this still requires the cast in wxWindow::SetValidator(), but it's better to have it there rather than in wxValidator and use the simpler type in the public function signature.
138 lines
4.1 KiB
Objective-C
138 lines
4.1 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
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// Name: validate.h
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// Purpose: interface of wxValidator
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// Author: wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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@class wxValidator
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wxValidator is the base class for a family of validator classes that
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mediate between a class of control, and application data.
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A validator has three major roles:
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-# To transfer data from a C++ variable or own storage to and from a
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control.
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-# To validate data in a control, and show an appropriate error message.
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-# To filter events (such as keystrokes), thereby changing the behaviour
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of the associated control.
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Validators can be plugged into controls dynamically.
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To specify a default, "null" validator, use ::wxDefaultValidator.
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For more information, please see @ref overview_validator.
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@library{wxcore}
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@category{validator}
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@stdobjects
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::wxDefaultValidator
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@see @ref overview_validator, wxTextValidator, wxGenericValidator,
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wxIntegerValidator, wxFloatingPointValidator
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*/
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class wxValidator : public wxEvtHandler
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{
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public:
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/**
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Constructor.
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*/
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wxValidator();
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/**
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Destructor.
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*/
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virtual ~wxValidator();
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/**
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All validator classes must implement the Clone() function, which
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returns an identical copy of itself.
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This is because validators are passed to control constructors as
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references which must be copied. Unlike objects such as pens and
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brushes, it does not make sense to have a reference counting scheme to
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do this cloning because all validators should have separate data.
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@return This base function returns @NULL.
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*/
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virtual wxObject* Clone() const;
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/**
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Returns the window associated with the validator.
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*/
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wxWindow* GetWindow() const;
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/**
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This functions switches on or turns off the error sound produced by the
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validators if an invalid key is pressed.
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@since 2.9.1
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@param suppress
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If @true, error sound is not played when a validator detects an
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error. If @false, error sound is enabled.
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*/
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static void SuppressBellOnError(bool suppress = true);
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/**
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Returns if the error sound is currently disabled.
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*/
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static bool IsSilent();
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/**
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Associates a window with the validator.
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This function is automatically called by wxWidgets when creating a
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wxWindow-derived class instance which takes a wxValidator reference.
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Since wxWidgets 3.1.1, it can be overridden in custom validators in
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order to perform any one-time initialization or checks of the window
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when the validator is associated with it.
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E.g.
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@code
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new wxTextCtrl(this, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, 0,
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wxTextValidator(wxFILTER_ALPHA, &g_data.m_string));
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@endcode
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will automatically link the wxTextValidator instance with the wxTextCtrl
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instance and call SetWindow() method on the wxTextValidator object.
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*/
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virtual void SetWindow(wxWindow* window);
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/**
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This overridable function is called when the value in the window must
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be transferred to the validator.
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@return @false if there is a problem.
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*/
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virtual bool TransferFromWindow();
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/**
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This overridable function is called when the value associated with the
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validator must be transferred to the window.
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@return @false if there is a problem.
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*/
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virtual bool TransferToWindow();
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/**
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This overridable function is called when the value in the associated
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window must be validated.
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@param parent
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The parent of the window associated with the validator.
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@return @false if the value in the window is not valid; you may pop up
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an error dialog.
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*/
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virtual bool Validate(wxWindow* parent);
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};
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/**
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An empty, "null" wxValidator instance.
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*/
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const wxValidator wxDefaultValidator;
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