qvalidator man page on aLinux

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QValidator(3qt)						       QValidator(3qt)

NAME
       QValidator - Validation of input text

SYNOPSIS
       #include <qvalidator.h>

       Inherits QObject.

       Inherited by QIntValidator, QDoubleValidator, and QRegExpValidator.

   Public Members
       QValidator ( QObject * parent, const char * name = 0 )
       ~QValidator ()
       enum State { Invalid, Intermediate, Valid = Intermediate, Acceptable }
       virtual State validate ( QString & input, int & pos ) const = 0
       virtual void fixup ( QString & input ) const

DESCRIPTION
       The QValidator class provides validation of input text.

       The class itself is abstract. Two subclasses, QIntValidator and
       QDoubleValidator, provide basic numeric-range checking, and
       QRegExpValidator provides general checking using a custom regular
       expression.

       If the built-in validators aren't sufficient, you can subclass
       QValidator. The class has two virtual functions: validate() and
       fixup().

       validate() must be implemented by every subclass. It returns Invalid,
       Intermediate or Acceptable depending on whether its argument is valid
       (for the subclass's definition of valid).

       These three states require some explanation. An Invalid string is
       clearly invalid. Intermediate is less obvious: the concept of validity
       is slippery when the string is incomplete (still being edited).
       QValidator defines Intermediate as the property of a string that is
       neither clearly invalid nor acceptable as a final result. Acceptable
       means that the string is acceptable as a final result. One might say
       that any string that is a plausible intermediate state during entry of
       an Acceptable string is Intermediate.

       Here are some examples:

       For a line edit that accepts integers from 0 to 999 inclusive, 42 and
       123 are Acceptable, the empty string and 1114 are Intermediate and asdf
       is Invalid.

       For an editable combobox that accepts URLs, any well-formed URL is
       Acceptable, "http://www.trolltech.com/," is Intermediate (it might be a
       cut and paste operation that accidentally took in a comma at the end),
       the empty string is Intermediate (the user might select and delete all
       of the text in preparation for entering a new URL), and "http:///./" is
       Invalid.

       For a spin box that accepts lengths, "11cm" and "1in" are Acceptable,
       "11" and the empty string are Intermediate and"
       http://www.trolltech.com" and "hour" are Invalid.

       fixup() is provided for validators that can repair some user errors.
       The default implementation does nothing. QLineEdit, for example, will
       call fixup() if the user presses Enter (or Return) and the content is
       not currently valid. This allows the fixup() function the opportunity
       of performing some magic to make an Invalid string Acceptable.

       QValidator is typically used with QLineEdit, QSpinBox and QComboBox.

       See also Miscellaneous Classes.

   Member Type Documentation
QValidator::State
       This enum type defines the states in which a validated string can
       exist.

       QValidator::Invalid - the string is clearly invalid.

       QValidator::Intermediate - the string is a plausible intermediate value
       during editing.

       QValidator::Acceptable - the string is acceptable as a final result,
       i.e. it is valid.

MEMBER FUNCTION DOCUMENTATION
QValidator::QValidator ( QObject * parent, const char * name = 0 )
       Sets up the validator. The parent and name parameters are passed on to
       the QObject constructor.

QValidator::~QValidator ()
       Destroys the validator, freeing any storage and other resources used.

void QValidator::fixup ( QString & input ) const [virtual]
       This function attempts to change input to be valid according to this
       validator's rules. It need not result in a valid string: callers of
       this function must re-test afterwards; the default does nothing.

       Reimplementations of this function can change input even if they do not
       produce a valid string. For example, an ISBN validator might want to
       delete every character except digits and "-", even if the result is
       still not a valid ISBN; a surname validator might want to remove
       whitespace from the start and end of the string, even if the resulting
       string is not in the list of accepted surnames.

State QValidator::validate ( QString & input, int & pos ) const [pure virtual]

       This pure virtual function returns Invalid if input is invalid
       according to this validator's rules, Intermediate if it is likely that
       a little more editing will make the input acceptable (e.g. the user
       types '4' into a widget which accepts integers between 10 and 99) and
       Acceptable if the input is valid.

       The function can change input and pos (the cursor position) if it wants
       to.

       Reimplemented in QIntValidator, QDoubleValidator, and QRegExpValidator.

SEE ALSO
       http://doc.trolltech.com/qvalidator.html
       http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
       license file included in the distribution for a complete license
       statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to
       help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is
       located at $QTDIR/doc/html and can be read using Qt Assistant or with a
       web browser. This man page is provided as a convenience for those users
       who prefer man pages, although this format is not officially supported
       by Trolltech.

       If you find errors in this manual page, please report them to qt-
       bugs@trolltech.com.  Please include the name of the manual page
       (qvalidator.3qt) and the Qt version (3.3.8).

Trolltech AS			2 February 2007		       QValidator(3qt)
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