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<td >Qt 5.12</td><td ><a href="qtgui-index.html">Qt GUI</a></td><td ><a href="qtgui-module.html">C++ Classes</a></td><td >QIntValidator</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtgui-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#reimplemented-public-functions">Reimplemented Public Functions</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QIntValidator Class</h1>
<!-- $$$QIntValidator-brief -->
<p>The <a href="qintvalidator.html">QIntValidator</a> class provides a validator that ensures a string contains a valid integer within a specified range. <a href="#details">More...</a></p>
<!-- @@@QIntValidator -->
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QIntValidator></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += gui</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qvalidator.html">QValidator</a></td></tr></table></div><ul>
<li><a href="qintvalidator-members.html">List of all members, including inherited members</a></li>
<li><a href="qintvalidator-obsolete.html">Obsolete members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><a href="qintvalidator.html#bottom-prop">bottom</a></b> : int</li>
<li class="fn"><b><a href="qintvalidator.html#top-prop">top</a></b> : int</li>
</ul>
<ul>
<li class="fn">1 property inherited from <a href="../qtcore/qobject.html#properties">QObject</a></li>
</ul>
<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#QIntValidator">QIntValidator</a></b>(QObject *<i>parent</i> = nullptr)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#QIntValidator-1">QIntValidator</a></b>(int <i>minimum</i>, int <i>maximum</i>, QObject *<i>parent</i> = nullptr)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#dtor.QIntValidator">~QIntValidator</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#bottom-prop">bottom</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#bottom-prop">setBottom</a></b>(<i>int</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#setRange">setRange</a></b>(int <i>bottom</i>, int <i>top</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#top-prop">setTop</a></b>(<i>int</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#top-prop">top</a></b>() const</td></tr>
</table></div>
<a name="reimplemented-public-functions"></a>
<h2 id="reimplemented-public-functions">Reimplemented Public Functions</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#fixup">fixup</a></b>(QString &<i>input</i>) const override</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual QValidator::State </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#validate">validate</a></b>(QString &<i>input</i>, int &<i>pos</i>) const override</td></tr>
</table></div>
<ul>
<li class="fn">4 public functions inherited from <a href="qvalidator.html#public-functions">QValidator</a></li>
<li class="fn">31 public functions inherited from <a href="../qtcore/qobject.html#public-functions">QObject</a></li>
</ul>
<a name="static-public-members"></a>
<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#staticMetaObject-var">staticMetaObject</a></b></td></tr>
</table></div>
<ul>
<li class="fn">9 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 public slot inherited from <a href="../qtcore/qobject.html#public-slots">QObject</a></li>
<li class="fn">1 signal inherited from <a href="qvalidator.html#signals">QValidator</a></li>
<li class="fn">2 signals inherited from <a href="../qtcore/qobject.html#signals">QObject</a></li>
<li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QIntValidator-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qintvalidator.html">QIntValidator</a> class provides a validator that ensures a string contains a valid integer within a specified range.</p>
<p>Example of use:</p>
<pre class="cpp">
<span class="type"><a href="qvalidator.html#QValidator">QValidator</a></span> <span class="operator">*</span>validator <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qintvalidator.html#QIntValidator">QIntValidator</a></span>(<span class="number">100</span><span class="operator">,</span> <span class="number">999</span><span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="../qtwidgets/qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>edit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlineedit.html">QLineEdit</a></span>(<span class="keyword">this</span>);
<span class="comment">// the edit lineedit will only accept integers between 100 and 999</span>
edit<span class="operator">-</span><span class="operator">></span>setValidator(validator);
</pre>
<p>Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.</p>
<pre class="cpp">
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> str;
<span class="type">int</span> pos <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qintvalidator.html#QIntValidator">QIntValidator</a></span> v(<span class="number">100</span><span class="operator">,</span> <span class="number">900</span><span class="operator">,</span> <span class="keyword">this</span>);
str <span class="operator">=</span> <span class="string">"1"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Intermediate</span>
str <span class="operator">=</span> <span class="string">"012"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Intermediate</span>
str <span class="operator">=</span> <span class="string">"123"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Acceptable</span>
str <span class="operator">=</span> <span class="string">"678"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Acceptable</span>
str <span class="operator">=</span> <span class="string">"999"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Intermediate</span>
str <span class="operator">=</span> <span class="string">"1234"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
str <span class="operator">=</span> <span class="string">"-123"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
str <span class="operator">=</span> <span class="string">"abc"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
str <span class="operator">=</span> <span class="string">"12cm"</span>;
v<span class="operator">.</span>validate(str<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
</pre>
<p>Notice that the value <code>999</code> returns Intermediate. Values consisting of a number of digits equal to or less than the max value are considered intermediate. This is intended because the digit that prevents a number from being in range is not necessarily the last digit typed. This also means that an intermediate number can have leading zeros.</p>
<p>The minimum and maximum values are set in one call with <a href="qintvalidator.html#setRange">setRange</a>(), or individually with <a href="qintvalidator.html#bottom-prop">setBottom</a>() and <a href="qintvalidator.html#top-prop">setTop</a>().</p>
<p><a href="qintvalidator.html">QIntValidator</a> uses its <a href="qvalidator.html#locale">locale</a>() to interpret the number. For example, in Arabic locales, <a href="qintvalidator.html">QIntValidator</a> will accept Arabic digits.</p>
<p><b>Note: </b>The <a href="../qtcore/qlocale.html#NumberOption-enum">QLocale::NumberOptions</a> set on the <a href="qvalidator.html#locale">locale</a>() also affect the way the number is interpreted. For example, since <a href="../qtcore/qlocale.html#NumberOption-enum">QLocale::RejectGroupSeparator</a> is not set by default, the validator will accept group separators. It is thus recommended to use <a href="../qtcore/qlocale.html#toInt-2">QLocale::toInt</a>() to obtain the numeric value.</p></div>
<p><b>See also </b><a href="qdoublevalidator.html">QDoubleValidator</a>, <a href="qregexpvalidator.html">QRegExpValidator</a>, <a href="../qtcore/qlocale.html#toInt-2">QLocale::toInt</a>(), and <a href="../qtwidgets/qtwidgets-widgets-lineedits-example.html">Line Edits Example</a>.</p>
<!-- @@@QIntValidator -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$bottom-prop$$$bottom$$$setBottomint -->
<h3 class="fn" id="bottom-prop"><a name="bottom-prop"></a><span class="name">bottom</span> : <span class="type">int</span></h3>
<p>This property holds the validator's lowest acceptable value</p>
<p>By default, this property's value is derived from the lowest signed integer available (typically -2147483647).</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>bottom</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setBottom</b></span>(<i>int</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qintvalidator.html#setRange">setRange</a>().</p>
<!-- @@@bottom -->
<!-- $$$top-prop$$$top$$$setTopint -->
<h3 class="fn" id="top-prop"><a name="top-prop"></a><span class="name">top</span> : <span class="type">int</span></h3>
<p>This property holds the validator's highest acceptable value</p>
<p>By default, this property's value is derived from the highest signed integer available (typically 2147483647).</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>top</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setTop</b></span>(<i>int</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qintvalidator.html#setRange">setRange</a>().</p>
<!-- @@@top -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QIntValidator[overload1]$$$QIntValidatorQObject* -->
<h3 class="fn" id="QIntValidator"><a name="QIntValidator"></a>QIntValidator::<span class="name">QIntValidator</span>(<span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3>
<p>Constructs a validator with a <i>parent</i> object that accepts all integers.</p>
<!-- @@@QIntValidator -->
<!-- $$$QIntValidator$$$QIntValidatorintintQObject* -->
<h3 class="fn" id="QIntValidator-1"><a name="QIntValidator-1"></a>QIntValidator::<span class="name">QIntValidator</span>(<span class="type">int</span> <i>minimum</i>, <span class="type">int</span> <i>maximum</i>, <span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3>
<p>Constructs a validator with a <i>parent</i>, that accepts integers from <i>minimum</i> to <i>maximum</i> inclusive.</p>
<!-- @@@QIntValidator -->
<!-- $$$~QIntValidator[overload1]$$$~QIntValidator -->
<h3 class="fn" id="dtor.QIntValidator"><a name="dtor.QIntValidator"></a><code>[virtual] </code>QIntValidator::<span class="name">~QIntValidator</span>()</h3>
<p>Destroys the validator.</p>
<!-- @@@~QIntValidator -->
<!-- $$$fixup[overload1]$$$fixupQString& -->
<h3 class="fn" id="fixup"><a name="fixup"></a><code>[override virtual] </code><span class="type">void</span> QIntValidator::<span class="name">fixup</span>(<span class="type"><a href="../qtcore/qstring.html">QString</a></span> &<i>input</i>) const</h3>
<p>Reimplemented from <a href="qvalidator.html#fixup">QValidator::fixup</a>().</p>
<!-- @@@fixup -->
<!-- $$$setRange[overload1]$$$setRangeintint -->
<h3 class="fn" id="setRange"><a name="setRange"></a><code>[virtual] </code><span class="type">void</span> QIntValidator::<span class="name">setRange</span>(<span class="type">int</span> <i>bottom</i>, <span class="type">int</span> <i>top</i>)</h3>
<p>Sets the range of the validator to only accept integers between <i>bottom</i> and <i>top</i> inclusive.</p>
<!-- @@@setRange -->
<!-- $$$validate[overload1]$$$validateQString&int& -->
<h3 class="fn" id="validate"><a name="validate"></a><code>[override virtual] </code><span class="type"><a href="qvalidator.html#State-enum">QValidator::State</a></span> QIntValidator::<span class="name">validate</span>(<span class="type"><a href="../qtcore/qstring.html">QString</a></span> &<i>input</i>, <span class="type">int</span> &<i>pos</i>) const</h3>
<p>Reimplemented from <a href="qvalidator.html#validate">QValidator::validate</a>().</p>
<p>Returns <a href="qvalidator.html#State-enum">Acceptable</a> if the <i>input</i> is an integer within the valid range, <a href="qvalidator.html#State-enum">Intermediate</a> if the <i>input</i> is a prefix of an integer in the valid range, and <a href="qvalidator.html#State-enum">Invalid</a> otherwise.</p>
<p>If the valid range consists of just positive integers (e.g., 32 to 100) and <i>input</i> is a negative integer, then Invalid is returned. (On the other hand, if the range consists of negative integers (e.g., -100 to -32) and <i>input</i> is a positive integer, then Intermediate is returned, because the user might be just about to type the minus (especially for right-to-left languages).</p>
<pre class="cpp">
<span class="type">int</span> pos <span class="operator">=</span> <span class="number">0</span>;
s <span class="operator">=</span> <span class="string">"abc"</span>;
v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
s <span class="operator">=</span> <span class="string">"5"</span>;
v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// returns Intermediate</span>
s <span class="operator">=</span> <span class="string">"50"</span>;
v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// returns Acceptable</span>
</pre>
<p>By default, the <i>pos</i> parameter is not used by this validator.</p>
<!-- @@@validate -->
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