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<td >Qt 5.9</td><td ><a href="qtgui-index.html">Qt GUI</a></td><td ><a href="qtgui-module.html">C++ Classes</a></td><td >QDoubleValidator</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-types">Public Types</a></li>
<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="#details">Detailed Description</a></li>
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<h1 class="title">QDoubleValidator Class</h1>
<!-- $$$QDoubleValidator-brief -->
<p>The <a href="qdoublevalidator.html">QDoubleValidator</a> class provides range checking of floating-point numbers. <a href="#details">More...</a></p>
<!-- @@@QDoubleValidator -->
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QDoubleValidator></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="qdoublevalidator-members.html">List of all members, including inherited members</a></li>
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<a name="public-types"></a>
<h2 id="public-types">Public Types</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> enum </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#Notation-enum">Notation</a></b> { StandardNotation, ScientificNotation }</td></tr>
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<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><a href="qdoublevalidator.html#bottom-prop">bottom</a></b> : double</li>
<li class="fn"><b><a href="qdoublevalidator.html#decimals-prop">decimals</a></b> : int</li>
<li class="fn"><b><a href="qdoublevalidator.html#notation-prop">notation</a></b> : Notation</li>
<li class="fn"><b><a href="qdoublevalidator.html#top-prop">top</a></b> : double</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>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#QDoubleValidator">QDoubleValidator</a></b>(QObject *<i>parent</i> = Q_NULLPTR)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#QDoubleValidator-1">QDoubleValidator</a></b>(double <i>bottom</i>, double <i>top</i>, int <i>decimals</i>, QObject *<i>parent</i> = Q_NULLPTR)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#dtor.QDoubleValidator">~QDoubleValidator</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> double </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#bottom-prop">bottom</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#decimals-prop">decimals</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Notation </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#notation-prop">notation</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#bottom-prop">setBottom</a></b>(<i>double</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#decimals-prop">setDecimals</a></b>(<i>int</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#notation-prop">setNotation</a></b>(<i>Notation</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#setRange">setRange</a></b>(double <i>minimum</i>, double <i>maximum</i>, int <i>decimals</i> = 0)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#top-prop">setTop</a></b>(<i>double</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> double </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#top-prop">top</a></b>() const</td></tr>
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<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 QValidator::State </td><td class="memItemRight bottomAlign"><b><a href="qdoublevalidator.html#validate">validate</a></b>(QString &<i>input</i>, int &<i>pos</i>) const</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">32 public functions inherited from <a href="../qtcore/qobject.html#public-functions">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">1 public variable inherited from <a href="../qtcore/qobject.html#public-variables">QObject</a></li>
<li class="fn">10 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li>
<li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li>
<li class="fn">2 protected variables inherited from <a href="../qtcore/qobject.html#protected-variables">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QDoubleValidator-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qdoublevalidator.html">QDoubleValidator</a> class provides range checking of floating-point numbers.</p>
<p><a href="qdoublevalidator.html">QDoubleValidator</a> provides an upper bound, a lower bound, and a limit on the number of digits after the decimal point. It does not provide a <a href="qvalidator.html#fixup">fixup</a>() function.</p>
<p>You can set the acceptable range in one call with <a href="qdoublevalidator.html#setRange">setRange</a>(), or with <a href="qdoublevalidator.html#bottom-prop">setBottom</a>() and <a href="qdoublevalidator.html#top-prop">setTop</a>(). Set the number of decimal places with <a href="qdoublevalidator.html#decimals-prop">setDecimals</a>(). The <a href="qdoublevalidator.html#validate">validate</a>() function returns the validation state.</p>
<p><a href="qdoublevalidator.html">QDoubleValidator</a> uses its <a href="qvalidator.html#locale">locale</a>() to interpret the number. For example, in the German locale, "1,234" will be accepted as the fractional number 1.234. In Arabic locales, <a href="qdoublevalidator.html">QDoubleValidator</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#toDouble">QLocale::toDouble</a>() to obtain the numeric value.</p></div>
<p><b>See also </b><a href="qintvalidator.html">QIntValidator</a>, <a href="qregexpvalidator.html">QRegExpValidator</a>, <a href="../qtcore/qlocale.html#toDouble">QLocale::toDouble</a>(), and <a href="../qtwidgets/qtwidgets-widgets-lineedits-example.html">Line Edits Example</a>.</p>
<!-- @@@QDoubleValidator -->
<div class="types">
<h2>Member Type Documentation</h2>
<!-- $$$Notation$$$StandardNotation$$$ScientificNotation -->
<h3 class="fn" id="Notation-enum"><a name="Notation-enum"></a>enum QDoubleValidator::<span class="name">Notation</span></h3>
<p>This enum defines the allowed notations for entering a double.</p>
<div class="table"><table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><code>QDoubleValidator::StandardNotation</code></td><td class="topAlign tblval"><code>0</code></td><td class="topAlign">The string is written as a standard number (i.e. 0.015).</td></tr>
<tr><td class="topAlign"><code>QDoubleValidator::ScientificNotation</code></td><td class="topAlign tblval"><code>1</code></td><td class="topAlign">The string is written in scientific form. It may have an exponent part(i.e. 1.5E-2).</td></tr>
</table></div>
<p>This enum was introduced or modified in Qt 4.3.</p>
<!-- @@@Notation -->
</div>
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$bottom-prop$$$bottom$$$setBottomdouble -->
<h3 class="fn" id="bottom-prop"><a name="bottom-prop"></a><span class="name">bottom</span> : <span class="type">double</span></h3>
<p>This property holds the validator's minimum acceptable value</p>
<p>By default, this property contains a value of -infinity.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> double </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>double</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qdoublevalidator.html#setRange">setRange</a>().</p>
<!-- @@@bottom -->
<!-- $$$decimals-prop$$$decimals$$$setDecimalsint -->
<h3 class="fn" id="decimals-prop"><a name="decimals-prop"></a><span class="name">decimals</span> : <span class="type">int</span></h3>
<p>This property holds the validator's maximum number of digits after the decimal point</p>
<p>By default, this property contains a value of 1000.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>decimals</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setDecimals</b></span>(<i>int</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qdoublevalidator.html#setRange">setRange</a>().</p>
<!-- @@@decimals -->
<!-- $$$notation-prop$$$notation$$$setNotationNotation -->
<h3 class="fn" id="notation-prop"><a name="notation-prop"></a><span class="name">notation</span> : <span class="type"><a href="qdoublevalidator.html#Notation-enum">Notation</a></span></h3>
<p>This property holds the notation of how a string can describe a number</p>
<p>By default, this property is set to <a href="qdoublevalidator.html#Notation-enum">ScientificNotation</a>.</p>
<p>This property was introduced in Qt 4.3.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> Notation </td><td class="memItemRight bottomAlign"><span class="name"><b>notation</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setNotation</b></span>(<i>Notation</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qdoublevalidator.html#Notation-enum">Notation</a>.</p>
<!-- @@@notation -->
<!-- $$$top-prop$$$top$$$setTopdouble -->
<h3 class="fn" id="top-prop"><a name="top-prop"></a><span class="name">top</span> : <span class="type">double</span></h3>
<p>This property holds the validator's maximum acceptable value</p>
<p>By default, this property contains a value of infinity.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> double </td><td class="memItemRight bottomAlign"><span class="name"><b>top</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setTop</b></span>(<i>double</i>)</td></tr>
</table></div>
<p><b>See also </b><a href="qdoublevalidator.html#setRange">setRange</a>().</p>
<!-- @@@top -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QDoubleValidator[overload1]$$$QDoubleValidatorQObject* -->
<h3 class="fn" id="QDoubleValidator"><a name="QDoubleValidator"></a>QDoubleValidator::<span class="name">QDoubleValidator</span>(<span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = Q_NULLPTR)</h3>
<p>Constructs a validator object with a <i>parent</i> object that accepts any double.</p>
<!-- @@@QDoubleValidator -->
<!-- $$$QDoubleValidator$$$QDoubleValidatordoubledoubleintQObject* -->
<h3 class="fn" id="QDoubleValidator-1"><a name="QDoubleValidator-1"></a>QDoubleValidator::<span class="name">QDoubleValidator</span>(<span class="type">double</span> <i>bottom</i>, <span class="type">double</span> <i>top</i>, <span class="type">int</span> <i>decimals</i>, <span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = Q_NULLPTR)</h3>
<p>Constructs a validator object with a <i>parent</i> object. This validator will accept doubles from <i>bottom</i> to <i>top</i> inclusive, with up to <i>decimals</i> digits after the decimal point.</p>
<!-- @@@QDoubleValidator -->
<!-- $$$~QDoubleValidator[overload1]$$$~QDoubleValidator -->
<h3 class="fn" id="dtor.QDoubleValidator"><a name="dtor.QDoubleValidator"></a>QDoubleValidator::<span class="name">~QDoubleValidator</span>()</h3>
<p>Destroys the validator.</p>
<!-- @@@~QDoubleValidator -->
<!-- $$$setRange[overload1]$$$setRangedoubledoubleint -->
<h3 class="fn" id="setRange"><a name="setRange"></a><code>[virtual] </code><span class="type">void</span> QDoubleValidator::<span class="name">setRange</span>(<span class="type">double</span> <i>minimum</i>, <span class="type">double</span> <i>maximum</i>, <span class="type">int</span> <i>decimals</i> = 0)</h3>
<p>Sets the validator to accept doubles from <i>minimum</i> to <i>maximum</i> inclusive, with at most <i>decimals</i> digits after the decimal point.</p>
<!-- @@@setRange -->
<!-- $$$validate[overload1]$$$validateQString&int& -->
<h3 class="fn" id="validate"><a name="validate"></a><code>[virtual] </code><span class="type"><a href="qvalidator.html#State-enum">QValidator::State</a></span> QDoubleValidator::<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 string <i>input</i> contains a double that is within the valid range and is in the correct format.</p>
<p>Returns <a href="qvalidator.html#State-enum">Intermediate</a> if <i>input</i> contains a double that is outside the range or is in the wrong format; e.g. with too many digits after the decimal point or is empty.</p>
<p>Returns <a href="qvalidator.html#State-enum">Invalid</a> if the <i>input</i> is not a double.</p>
<p>Note: If the valid range consists of just positive doubles (e.g. 0.0 to 100.0) and <i>input</i> is a negative double then <a href="qvalidator.html#State-enum">Invalid</a> is returned. If <a href="qdoublevalidator.html#notation-prop">notation</a>() is set to <a href="qdoublevalidator.html#Notation-enum">StandardNotation</a>, and the input contains more digits before the decimal point than a double in the valid range may have, <a href="qvalidator.html#State-enum">Invalid</a> is returned. If <a href="qdoublevalidator.html#notation-prop">notation</a>() is <a href="qdoublevalidator.html#Notation-enum">ScientificNotation</a>, and the input is not in the valid range, <a href="qvalidator.html#State-enum">Intermediate</a> is returned. The value may yet become valid by changing the exponent.</p>
<p>By default, the <i>pos</i> parameter is not used by this validator.</p>
<!-- @@@validate -->
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