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154 lines
8.6 KiB
154 lines
8.6 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qvalidator.cpp:44 -->
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQValidator Class Reference</h1>
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<p>The TQValidator class provides validation of input text.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qvalidator-h.html">ntqvalidator.h</a>></tt>
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<p>Inherits <a href="tqobject.html">TQObject</a>.
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<p>Inherited by <a href="qintvalidator.html">TQIntValidator</a>, <a href="qdoublevalidator.html">TQDoubleValidator</a>, and <a href="tqregexpvalidator.html">TQRegExpValidator</a>.
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<p><a href="qvalidator-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQValidator"><b>TQValidator</b></a> ( TQObject * parent, const char * name = 0 )</li>
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<li class=fn><a href="#~TQValidator"><b>~TQValidator</b></a> ()</li>
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<li class=fn>enum <a href="#State-enum"><b>State</b></a> { Invalid, Intermediate, Valid = Intermediate, Acceptable }</li>
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<li class=fn>virtual State <a href="#validate"><b>validate</b></a> ( TQString & input, int & pos ) const = 0</li>
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<li class=fn>virtual void <a href="#fixup"><b>fixup</b></a> ( TQString & input ) const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQValidator class provides validation of input text.
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<p>
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<p> The class itself is abstract. Two subclasses, <a href="qintvalidator.html">TQIntValidator</a> and
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<a href="qdoublevalidator.html">TQDoubleValidator</a>, provide basic numeric-range checking, and <a href="tqregexpvalidator.html">TQRegExpValidator</a> provides general checking using a custom <a href="tqregexp.html#regular-expression">regular expression</a>.
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<p> If the built-in validators aren't sufficient, you can subclass
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TQValidator. The class has two virtual functions: <a href="#validate">validate</a>() and
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<a href="#fixup">fixup</a>().
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<p> <a href="#validate">validate</a>() must be implemented by every subclass. It returns
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<a href="#State-enum">Invalid</a>, <a href="#State-enum">Intermediate</a> or <a href="#State-enum">Acceptable</a> depending on whether
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its argument is valid (for the subclass's definition of valid).
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<p> These three states require some explanation. An <a href="#State-enum">Invalid</a> string
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is <em>clearly</em> invalid. <a href="#State-enum">Intermediate</a> is less obvious: the
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concept of validity is slippery when the string is incomplete
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(still being edited). TQValidator defines <a href="#State-enum">Intermediate</a> as the
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property of a string that is neither clearly invalid nor
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acceptable as a final result. <a href="#State-enum">Acceptable</a> means that the string
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is acceptable as a final result. One might say that any string
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that is a plausible intermediate state during entry of an <a href="#State-enum">Acceptable</a> string is <a href="#State-enum">Intermediate</a>.
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<p> Here are some examples:
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<p> <ul>
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<p> <li> For a line edit that accepts integers from 0 to 999 inclusive,
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42 and 123 are <a href="#State-enum">Acceptable</a>, the empty string and 1114 are <a href="#State-enum">Intermediate</a> and asdf is <a href="#State-enum">Invalid</a>.
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<p> <li> For an editable combobox that accepts URLs, any well-formed URL
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is <a href="#State-enum">Acceptable</a>, "http://www.trolltech.com/," is <a href="#State-enum">Intermediate</a>
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(it might be a cut and paste operation that accidentally took in a
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comma at the end), the empty string is <a href="#State-enum">Intermediate</a> (the user
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might select and delete all of the text in preparation for entering
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a new URL), and "http:///./" is <a href="#State-enum">Invalid</a>.
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<p> <li> For a spin box that accepts lengths, "11cm" and "1in" are <a href="#State-enum">Acceptable</a>, "11" and the empty string are <a href="#State-enum">Intermediate</a> and
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"http://www.trolltech.com" and "hour" are <a href="#State-enum">Invalid</a>.
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<p> </ul>
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<p> <a href="#fixup">fixup</a>() is provided for validators that can repair some user
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errors. The default implementation does nothing. <a href="tqlineedit.html">TQLineEdit</a>, for
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example, will call <a href="#fixup">fixup</a>() if the user presses Enter (or Return)
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and the content is not currently valid. This allows the fixup()
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function the opportunity of performing some magic to make an <a href="#State-enum">Invalid</a> string <a href="#State-enum">Acceptable</a>.
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<p> TQValidator is typically used with TQLineEdit, <a href="tqspinbox.html">TQSpinBox</a> and
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<a href="tqcombobox.html">TQComboBox</a>.
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<p>See also <a href="misc.html">Miscellaneous Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="State-enum"></a>TQValidator::State</h3>
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<p> This enum type defines the states in which a validated string can
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exist.
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<ul>
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<li><tt>TQValidator::Invalid</tt> - the string is <em>clearly</em> invalid.
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<li><tt>TQValidator::Intermediate</tt> - the string is a plausible intermediate value
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during editing.
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<li><tt>TQValidator::Acceptable</tt> - the string is acceptable as a final result,
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i.e. it is valid.
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</ul>
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQValidator"></a>TQValidator::TQValidator ( <a href="tqobject.html">TQObject</a> * parent, const char * name = 0 )
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</h3>
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Sets up the validator. The <em>parent</em> and <em>name</em> parameters are
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passed on to the <a href="tqobject.html">TQObject</a> constructor.
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<h3 class=fn><a name="~TQValidator"></a>TQValidator::~TQValidator ()
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</h3>
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Destroys the validator, freeing any storage and other resources
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used.
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<h3 class=fn>void <a name="fixup"></a>TQValidator::fixup ( <a href="tqstring.html">TQString</a> & input ) const<tt> [virtual]</tt>
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</h3>
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<p> This function attempts to change <em>input</em> to be valid according to
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this validator's rules. It need not result in a valid string:
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callers of this function must re-test afterwards; the default does
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nothing.
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<p> Reimplementations of this function can change <em>input</em> even if
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they do not produce a valid string. For example, an ISBN validator
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might want to delete every character except digits and "-", even
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if the result is still not a valid ISBN; a surname validator might
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want to remove whitespace from the start and end of the string,
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even if the resulting string is not in the list of accepted
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surnames.
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<h3 class=fn><a href="ntqvalidator.html#State-enum">State</a> <a name="validate"></a>TQValidator::validate ( <a href="tqstring.html">TQString</a> & input, int & pos ) const<tt> [pure virtual]</tt>
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</h3>
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<p> This pure virtual function returns <a href="#State-enum">Invalid</a> if <em>input</em> is
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invalid according to this validator's rules, <a href="#State-enum">Intermediate</a> if it
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is likely that a little more editing will make the input
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acceptable (e.g. the user types '4' into a widget which accepts
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integers between 10 and 99) and <a href="#State-enum">Acceptable</a> if the input is
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valid.
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<p> The function can change <em>input</em> and <em>pos</em> (the cursor position)
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if it wants to.
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<p>Reimplemented in <a href="qintvalidator.html#validate">TQIntValidator</a>, <a href="qdoublevalidator.html#validate">TQDoubleValidator</a>, and <a href="tqregexpvalidator.html#validate">TQRegExpValidator</a>.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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