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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta name="robots" content="noindex,noarchive">
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<h1 align=center>QValidator Class Reference</h1><br clear="all">
<p>
The QValidator class provides validation of input text.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qvalidator-h.html">qvalidator.h</a>></code>
<p>
Inherits <a href="qobject.html">QObject</a>.
<p>Inherited by <a href="qdoublevalidator.html">QDoubleValidator</a> and <a href="qintvalidator.html">QIntValidator</a>.
<p><a href="qvalidator-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><span class="fn"><a href="qvalidator.html#a0"><strong>QValidator</strong></a>(QWidget*parent, constchar*name=0)</span>
<li><span class="fn"><a href="qvalidator.html#a1"><strong>~QValidator</strong></a>()</span>
<li><span class="fn">virtualState<a href="qvalidator.html#a2"><strong>validate</strong></a>(QString&, int&)</span>
<li><span class="fn">virtualvoid<a href="qvalidator.html#a3"><strong>fixup</strong></a>(QString&)</span>
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The QValidator class provides validation of input text.
<p>
The class itself is abstract; two subclasses provide rudimentary
numeric range checking.
<p>The class includes two virtual functions, <a href="qvalidator.html#a2">validate</a>() and <a href="qvalidator.html#a3">fixup</a>().
<p>validate() is pure virtual, so it must be implemented by every
subclass. It returns Invalid, Valid or Acceptable depending on
whether its argument is valid (for the class' definition of valid).
<p>fixup() is provided for validators that can repair some or all user
errors. The default does nothing. <a href="qlineedit.html">QLineEdit</a>, for example, will
call fixup() if the user presses Return and the content is not
currently valid, in case fixup() can do magic.
<p>QValidator is generally used with QLineEdit, <a href="qspinbox.html">QSpinBox</a> and <a href="qcombobox.html">QComboBox</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="a0"></a>QValidator::QValidator(<a href="qwidget.html">QWidget</a>*parent, constchar*name=0)</h3>
<p>Sets up the internal data structures used by the validator. At
the moment there aren't any.
<h3 class="fn"><a name="a1"></a>QValidator::~QValidator()</h3>
<p>Deletes the validator and frees any storage and other resources
used.
<h3 class="fn">void<a name="a3"></a>QValidator::fixup(<a href="qstring.html">QString</a>&input) <code>[virtual]</code></h3>
<p>Attempts to change <em>to</em> be valid according to this validator's
rules. Need not result in a valid string - callers of this function
must re-test afterwards. The default does nothing.
<p>Reimplementation notes:
<p>Note that <em>input</em> may not be the only <a href="qstring.html">QString</a> object referencing
this string, so it's almost always necessary to detach() the string
at the start of the code:
<p><pre> input.detach();
</pre>
<p>You can change <em>input</em> even if you aren't able to produce a valid
string. For example an ISBN validator might want to delete every
character except digits and "-", even if the result is not a valid
ISBN, and a last-name validator might want to remove white space
from the start and end of the string, even if the resulting string
is not in the list of known last names.
<h3 class="fn">QValidator::State<a name="a2"></a>QValidator::validate(QString&input, int&pos) <code>[virtual]</code></h3>
<p>This pure virtual function returns <code>Invalid</code> if <em>input</em> is invalid
according to this validator's rules, <code>Valid</code> 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 10-99) and <code>Acceptable</code> if
the input is completely acceptable.
<p>The function can change <em>input</em> and <em>pos</em> (the cursor position) if
it wants to.
<p>Reimplemented in <a href="qintvalidator.html#a3">QIntValidator</a> and <a href="qdoublevalidator.html#a3">QDoubleValidator</a>.
<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>,
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<p>
It was generated from the following files:
<ul>
<li>qvalidator.h: 1998/08/19
<li>qvalidator.cpp: 1998/07/03
</ul>
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