diff options
Diffstat (limited to 'doc/html/qvalidator.html')
| -rw-r--r-- | doc/html/qvalidator.html | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/doc/html/qvalidator.html b/doc/html/qvalidator.html new file mode 100644 index 00000000..78766fed --- /dev/null +++ b/doc/html/qvalidator.html @@ -0,0 +1,153 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/widgets/qvalidator.cpp:44 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>TQValidator Class</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<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> + +<p>The TQValidator class provides validation of input text. +<a href="#details">More...</a> +<p><tt>#include <<a href="qvalidator-h.html">qvalidator.h</a>></tt> +<p>Inherits <a href="qobject.html">TQObject</a>. +<p>Inherited by <a href="qintvalidator.html">TQIntValidator</a>, <a href="qdoublevalidator.html">TQDoubleValidator</a>, and <a href="qregexpvalidator.html">TQRegExpValidator</a>. +<p><a href="qvalidator-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#TQValidator"><b>TQValidator</b></a> ( TQObject * parent, const char * name = 0 )</li> +<li class=fn><a href="#~TQValidator"><b>~TQValidator</b></a> ()</li> +<li class=fn>enum <a href="#State-enum"><b>State</b></a> { Invalid, Intermediate, Valid = Intermediate, Acceptable }</li> +<li class=fn>virtual State <a href="#validate"><b>validate</b></a> ( TQString & input, int & pos ) const = 0</li> +<li class=fn>virtual void <a href="#fixup"><b>fixup</b></a> ( TQString & input ) const</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The TQValidator class provides validation of input text. +<p> + +<p> The class itself is abstract. Two subclasses, <a href="qintvalidator.html">TQIntValidator</a> and +<a href="qdoublevalidator.html">TQDoubleValidator</a>, provide basic numeric-range checking, and <a href="qregexpvalidator.html">TQRegExpValidator</a> provides general checking using a custom <a href="qregexp.html#regular-expression">regular expression</a>. +<p> If the built-in validators aren't sufficient, you can subclass +TQValidator. The class has two virtual functions: <a href="#validate">validate</a>() and +<a href="#fixup">fixup</a>(). +<p> <a href="#validate">validate</a>() must be implemented by every subclass. It returns +<a href="#State-enum">Invalid</a>, <a href="#State-enum">Intermediate</a> or <a href="#State-enum">Acceptable</a> depending on whether +its argument is valid (for the subclass's definition of valid). +<p> These three states retquire some explanation. An <a href="#State-enum">Invalid</a> string +is <em>clearly</em> invalid. <a href="#State-enum">Intermediate</a> is less obvious: the +concept of validity is slippery when the string is incomplete +(still being edited). TQValidator defines <a href="#State-enum">Intermediate</a> as the +property of a string that is neither clearly invalid nor +acceptable as a final result. <a href="#State-enum">Acceptable</a> 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 <a href="#State-enum">Acceptable</a> string is <a href="#State-enum">Intermediate</a>. +<p> Here are some examples: +<p> <ul> +<p> <li> For a line edit that accepts integers from 0 to 999 inclusive, +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>. +<p> <li> For an editable combobox that accepts URLs, any well-formed URL +is <a href="#State-enum">Acceptable</a>, "http://www.trolltech.com/," is <a href="#State-enum">Intermediate</a> +(it might be a cut and paste operation that accidentally took in a +comma at the end), the empty string is <a href="#State-enum">Intermediate</a> (the user +might select and delete all of the text in preparation for entering +a new URL), and "http:///./" is <a href="#State-enum">Invalid</a>. +<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 +"http://www.trolltech.com" and "hour" are <a href="#State-enum">Invalid</a>. +<p> </ul> +<p> <a href="#fixup">fixup</a>() is provided for validators that can repair some user +errors. The default implementation does nothing. <a href="qlineedit.html">TQLineEdit</a>, for +example, will call <a href="#fixup">fixup</a>() 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 <a href="#State-enum">Invalid</a> string <a href="#State-enum">Acceptable</a>. +<p> TQValidator is typically used with TQLineEdit, <a href="qspinbox.html">TQSpinBox</a> and +<a href="qcombobox.html">TQComboBox</a>. +<p>See also <a href="misc.html">Miscellaneous Classes</a>. + +<hr><h2>Member Type Documentation</h2> +<h3 class=fn><a name="State-enum"></a>TQValidator::State</h3> + +<p> This enum type defines the states in which a validated string can +exist. +<ul> +<li><tt>TQValidator::Invalid</tt> - the string is <em>clearly</em> invalid. +<li><tt>TQValidator::Intermediate</tt> - the string is a plausible intermediate value +during editing. +<li><tt>TQValidator::Acceptable</tt> - the string is acceptable as a final result, +i.e. it is valid. +</ul> +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="TQValidator"></a>TQValidator::TQValidator ( <a href="qobject.html">TQObject</a> * parent, const char * name = 0 ) +</h3> +Sets up the validator. The <em>parent</em> and <em>name</em> parameters are +passed on to the <a href="qobject.html">TQObject</a> constructor. + +<h3 class=fn><a name="~TQValidator"></a>TQValidator::~TQValidator () +</h3> +Destroys the validator, freeing any storage and other resources +used. + +<h3 class=fn>void <a name="fixup"></a>TQValidator::fixup ( <a href="qstring.html">TQString</a> & input ) const<tt> [virtual]</tt> +</h3> + +<p> This function attempts to change <em>input</em> 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. +<p> Reimplementations of this function can change <em>input</em> 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. + +<h3 class=fn><a href="qvalidator.html#State-enum">State</a> <a name="validate"></a>TQValidator::validate ( <a href="qstring.html">TQString</a> & input, int & pos ) const<tt> [pure virtual]</tt> +</h3> + +<p> This pure virtual function returns <a href="#State-enum">Invalid</a> if <em>input</em> is +invalid according to this validator's rules, <a href="#State-enum">Intermediate</a> 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 <a href="#State-enum">Acceptable</a> if the input is +valid. +<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#validate">TQIntValidator</a>, <a href="qdoublevalidator.html#validate">TQDoubleValidator</a>, and <a href="qregexpvalidator.html#validate">TQRegExpValidator</a>. +<!-- eof --> +<hr><p> +This file is part of the <a href="index.html">TQt toolkit</a>. +Copyright © 1995-2007 +<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>TQt 3.3.8</div> +</table></div></address></body> +</html> |