364 lines
23 KiB
HTML
364 lines
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HTML
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<h1 class="title">QIntValidator Class Reference</h1>
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<!-- $$$QIntValidator-brief -->
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<p>The QIntValidator class provides a validator that ensures a string contains a valid integer within a specified range. <a href="#details">More...</a></p>
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<!-- @@@QIntValidator -->
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<pre class="cpp"> <span class="preprocessor">#include <QIntValidator></span></pre><p><b>Inherits: </b><a href="qvalidator.html">QValidator</a>.</p>
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<ul>
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<li><a href="qintvalidator-members.html">List of all members, including inherited members</a></li>
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<a name="properties"></a>
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<h2>Properties</h2>
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<ul>
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<li class="fn"><b><a href="qintvalidator.html#bottom-prop">bottom</a></b> : int</li>
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<li class="fn"><b><a href="qintvalidator.html#top-prop">top</a></b> : int</li>
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<ul>
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<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
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<a name="public-functions"></a>
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<h2>Public Functions</h2>
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<table class="alignedsummary">
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#QIntValidator">QIntValidator</a></b> ( QObject * <i>parent</i> = 0 )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#QIntValidator-2">QIntValidator</a></b> ( int <i>minimum</i>, int <i>maximum</i>, QObject * <i>parent</i> = 0 )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#dtor.QIntValidator">~QIntValidator</a></b> ()</td></tr>
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<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>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#bottom-prop">setBottom</a></b> ( int )</td></tr>
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<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>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qintvalidator.html#top-prop">setTop</a></b> ( int )</td></tr>
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<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>
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</table>
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<a name="reimplemented-public-functions"></a>
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<h2>Reimplemented Public Functions</h2>
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<table class="alignedsummary">
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<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</td></tr>
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<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</td></tr>
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</table>
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<ul>
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<li class="fn">4 public functions inherited from <a href="qvalidator.html#public-functions">QValidator</a></li>
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<li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
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</ul>
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<h3>Additional Inherited Members</h3>
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<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
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<li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
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<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
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<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
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</ul>
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<a name="details"></a>
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<!-- $$$QIntValidator-description -->
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<div class="descr">
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<h2>Detailed Description</h2>
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<p>The QIntValidator class provides a validator that ensures a string contains a valid integer within a specified range.</p>
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<p>Example of use:</p>
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<pre class="cpp"> <span class="type"><a href="qvalidator.html">QValidator</a></span> <span class="operator">*</span>validator <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QIntValidator</span>(<span class="number">100</span><span class="operator">,</span> <span class="number">999</span><span class="operator">,</span> <span class="keyword">this</span>);
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<span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>edit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>(<span class="keyword">this</span>);
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<span class="comment">// the edit lineedit will only accept integers between 100 and 999</span>
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edit<span class="operator">-</span><span class="operator">></span>setValidator(validator);</pre>
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<p>Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.</p>
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<pre class="cpp"> <span class="type"><a href="qstring.html">QString</a></span> str;
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<span class="type">int</span> pos <span class="operator">=</span> <span class="number">0</span>;
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<span class="type">QIntValidator</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>);
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str <span class="operator">=</span> <span class="string">"1"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Intermediate</span>
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str <span class="operator">=</span> <span class="string">"012"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Intermediate</span>
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str <span class="operator">=</span> <span class="string">"123"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Acceptable</span>
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str <span class="operator">=</span> <span class="string">"678"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Acceptable</span>
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str <span class="operator">=</span> <span class="string">"999"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Intermediate</span>
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str <span class="operator">=</span> <span class="string">"1234"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
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str <span class="operator">=</span> <span class="string">"-123"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
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str <span class="operator">=</span> <span class="string">"abc"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
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str <span class="operator">=</span> <span class="string">"12cm"</span>;
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v<span class="operator">.</span><a href="qintvalidator.html#validate">validate</a>(str<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span></pre>
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<p>Notice that the value <tt>999</tt> 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 to be in range is not necessarily the last digit typed. This also means that an intermediate number can have leading zeros.</p>
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<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>
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<p>QIntValidator uses its <a href="qvalidator.html#locale">locale</a>() to interpret the number. For example, in Arabic locales, QIntValidator will accept Arabic digits. In addition, QIntValidator is always guaranteed to accept a number formatted according to the "C" locale.</p>
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</div>
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<p><b>See also </b><a href="qdoublevalidator.html">QDoubleValidator</a>, <a href="qregexpvalidator.html">QRegExpValidator</a>, and <a href="widgets-lineedits.html">Line Edits Example</a>.</p>
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<!-- @@@QIntValidator -->
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<div class="prop">
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<h2>Property Documentation</h2>
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<!-- $$$bottom-prop$$$bottom$$$setBottomint -->
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<h3 class="fn"><a name="bottom-prop"></a><span class="name">bottom</span> : <span class="type">int</span></h3>
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<p>This property holds the validator's lowest acceptable value.</p>
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<p>By default, this property's value is derived from the lowest signed integer available (typically -2147483647).</p>
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<p><b>Access functions:</b></p>
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<table class="alignedsummary">
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<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>bottom</b></span> () const</td></tr>
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<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setBottom</b></span> ( int )</td></tr>
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</table>
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<p><b>See also </b><a href="qintvalidator.html#setRange">setRange</a>().</p>
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<!-- @@@bottom -->
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<!-- $$$top-prop$$$top$$$setTopint -->
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<h3 class="fn"><a name="top-prop"></a><span class="name">top</span> : <span class="type">int</span></h3>
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<p>This property holds the validator's highest acceptable value.</p>
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<p>By default, this property's value is derived from the highest signed integer available (typically 2147483647).</p>
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<p><b>Access functions:</b></p>
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<table class="alignedsummary">
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<tr><td class="memItemLeft topAlign rightAlign"> int </td><td class="memItemRight bottomAlign"><span class="name"><b>top</b></span> () const</td></tr>
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<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setTop</b></span> ( int )</td></tr>
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</table>
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<p><b>See also </b><a href="qintvalidator.html#setRange">setRange</a>().</p>
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<!-- @@@top -->
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</div>
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<div class="func">
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<h2>Member Function Documentation</h2>
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<!-- $$$QIntValidator[overload1]$$$QIntValidatorQObject* -->
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<h3 class="fn"><a name="QIntValidator"></a>QIntValidator::<span class="name">QIntValidator</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3>
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<p>Constructs a validator with a <i>parent</i> object that accepts all integers.</p>
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<!-- @@@QIntValidator -->
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<!-- $$$QIntValidator$$$QIntValidatorintintQObject* -->
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<h3 class="fn"><a name="QIntValidator-2"></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="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3>
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<p>Constructs a validator with a <i>parent</i>, that accepts integers from <i>minimum</i> to <i>maximum</i> inclusive.</p>
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<!-- @@@QIntValidator -->
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<!-- $$$~QIntValidator[overload1]$$$~QIntValidator -->
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<h3 class="fn"><a name="dtor.QIntValidator"></a>QIntValidator::<span class="name">~QIntValidator</span> ()</h3>
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<p>Destroys the validator.</p>
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<!-- @@@~QIntValidator -->
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<!-- $$$fixup[overload1]$$$fixupQString& -->
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<h3 class="fn"><a name="fixup"></a><span class="type">void</span> QIntValidator::<span class="name">fixup</span> ( <span class="type"><a href="qstring.html">QString</a></span> & <i>input</i> ) const<tt> [virtual]</tt></h3>
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<p>Reimplemented from <a href="qvalidator.html#fixup">QValidator::fixup</a>().</p>
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<!-- @@@fixup -->
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<!-- $$$setRange[overload1]$$$setRangeintint -->
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<h3 class="fn"><a name="setRange"></a><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> )<tt> [virtual]</tt></h3>
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<p>Sets the range of the validator to only accept integers between <i>bottom</i> and <i>top</i> inclusive.</p>
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<!-- @@@setRange -->
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<!-- $$$validate[overload1]$$$validateQString&int& -->
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<h3 class="fn"><a name="validate"></a><span class="type"><a href="qvalidator.html#State-enum">QValidator::State</a></span> QIntValidator::<span class="name">validate</span> ( <span class="type"><a href="qstring.html">QString</a></span> & <i>input</i>, <span class="type">int</span> & <i>pos</i> ) const<tt> [virtual]</tt></h3>
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<p>Reimplemented from <a href="qvalidator.html#validate">QValidator::validate</a>().</p>
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<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>
|
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<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>;
|
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|
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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>
|
|
|
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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>
|
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<p>By default, the <i>pos</i> parameter is not used by this validator.</p>
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<!-- @@@validate -->
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