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<title>Qt 4.6: QRadioButton Class Reference</title>
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<a name="//apple_ref/cpp/cl//QRadioButton"></a>
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<td width="1"> </td><td class="postheader" 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="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">QRadioButton Class Reference<br /><span class="small-subtitle">[<a href="qtgui.html">QtGui</a> module]</span>
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<p>The QRadioButton widget provides a radio button with a text label. <a href="#details">More...</a></p>
<pre> #include <QRadioButton></pre><p>Inherits <a href="qabstractbutton.html">QAbstractButton</a>.</p>
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<li><a href="qradiobutton-members.html">List of all members, including inherited members</a></li>
<li><a href="qradiobutton-qt3.html">Qt 3 support members</a></li>
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<h2>Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qradiobutton.html#QRadioButton">QRadioButton</a></b> ( QWidget * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"></td><td class="memItemRight" valign="bottom"><b><a href="qradiobutton.html#QRadioButton-2">QRadioButton</a></b> ( const QString & <i>text</i>, QWidget * <i>parent</i> = 0 )</td></tr>
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<h2>Reimplemented Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">virtual QSize </td><td class="memItemRight" valign="bottom"><b><a href="qradiobutton.html#sizeHint">sizeHint</a></b> () const</td></tr>
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<li><div bar="2" class="fn"></div>21 public functions inherited from <a href="qabstractbutton.html#public-functions">QAbstractButton</a></li>
<li><div bar="2" class="fn"></div>217 public functions inherited from <a href="qwidget.html#public-functions">QWidget</a></li>
<li><div bar="2" class="fn"></div>29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
<li><div bar="2" class="fn"></div>13 public functions inherited from <a href="qpaintdevice.html#public-functions">QPaintDevice</a></li>
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<h2>Protected Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><b><a href="qradiobutton.html#initStyleOption">initStyleOption</a></b> ( QStyleOptionButton * <i>option</i> ) const</td></tr>
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<h2>Reimplemented Protected Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><b><a href="qradiobutton.html#event">event</a></b> ( QEvent * <i>e</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><b><a href="qradiobutton.html#hitButton">hitButton</a></b> ( const QPoint & <i>pos</i> ) const</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><b><a href="qradiobutton.html#mouseMoveEvent">mouseMoveEvent</a></b> ( QMouseEvent * <i>e</i> )</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><b><a href="qradiobutton.html#paintEvent">paintEvent</a></b> ( QPaintEvent * )</td></tr>
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<li><div bar="2" class="fn"></div>14 protected functions inherited from <a href="qabstractbutton.html#protected-functions">QAbstractButton</a></li>
<li><div bar="2" class="fn"></div>37 protected functions inherited from <a href="qwidget.html#protected-functions">QWidget</a></li>
<li><div bar="2" class="fn"></div>7 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
<li><div bar="2" class="fn"></div>1 protected function inherited from <a href="qpaintdevice.html#protected-functions">QPaintDevice</a></li>
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<h3>Additional Inherited Members</h3>
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<li><div class="fn"></div>11 properties inherited from <a href="qabstractbutton.html#properties">QAbstractButton</a></li>
<li><div class="fn"></div>58 properties inherited from <a href="qwidget.html#properties">QWidget</a></li>
<li><div class="fn"></div>1 property inherited from <a href="qobject.html#properties">QObject</a></li>
<li><div class="fn"></div>5 public slots inherited from <a href="qabstractbutton.html#public-slots">QAbstractButton</a></li>
<li><div class="fn"></div>19 public slots inherited from <a href="qwidget.html#public-slots">QWidget</a></li>
<li><div class="fn"></div>1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li><div class="fn"></div>4 signals inherited from <a href="qabstractbutton.html#signals">QAbstractButton</a></li>
<li><div class="fn"></div>1 signal inherited from <a href="qwidget.html#signals">QWidget</a></li>
<li><div class="fn"></div>1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
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<li><div class="fn"></div>1 protected slot inherited from <a href="qwidget.html#protected-slots">QWidget</a></li>
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<a name="details"></a>
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<h2>Detailed Description</h2>
<p>The QRadioButton widget provides a radio button with a text label.</p>
<p>A QRadioButton is an option button that can be switched on (checked) or off (unchecked). Radio buttons typically present the user with a "one of many" choice. In a group of radio buttons only one radio button at a time can be checked; if the user selects another button, the previously selected button is switched off.</p>
<p>Radio buttons are <a href="qabstractbutton.html#autoExclusive-prop">autoExclusive</a> by default. If auto-exclusive is enabled, radio buttons that belong to the same parent widget behave as if they were part of the same exclusive button group. If you need multiple exclusive button groups for radio buttons that belong to the same parent widget, put them into a <a href="qbuttongroup.html">QButtonGroup</a>.</p>
<p>Whenever a button is switched on or off it emits the <a href="qabstractbutton.html#toggled">toggled</a>() signal. Connect to this signal if you want to trigger an action each time the button changes state. Use <a href="qabstractbutton.html#checked-prop">isChecked</a>() to see if a particular button is selected.</p>
<p>Just like <a href="qpushbutton.html">QPushButton</a>, a radio button displays text, and optionally a small icon. The icon is set with <a href="qabstractbutton.html#icon-prop">setIcon</a>(). The text can be set in the constructor or with <a href="qabstractbutton.html#text-prop">setText</a>(). A shortcut key can be specified by preceding the preferred character with an ampersand in the text. For example:</p>
<pre> QRadioButton *button = new QRadioButton("Search from the &cursor", this);</pre>
<p>In this example the shortcut is <i>Alt+c</i>. See the <a href="qshortcut.html#mnemonic">QShortcut</a> documentation for details (to display an actual ampersand, use '&&').</p>
<p>Important inherited members: <a href="qabstractbutton.html#text-prop">text</a>(), <a href="qabstractbutton.html#text-prop">setText</a>(), <a href="qabstractbutton.html#text-prop">text</a>(), <a href="qabstractbutton.html#down-prop">setDown</a>(), <a href="qabstractbutton.html#down-prop">isDown</a>(), <a href="qabstractbutton.html#autoRepeat-prop">autoRepeat</a>(), <a href="qabstractbutton.html#group">group</a>(), <a href="qabstractbutton.html#autoRepeat-prop">setAutoRepeat</a>(), <a href="qabstractbutton.html#toggle">toggle</a>(), <a href="qabstractbutton.html#pressed">pressed</a>(), <a href="qabstractbutton.html#released">released</a>(), <a href="qabstractbutton.html#clicked">clicked</a>(), and <a href="qabstractbutton.html#toggled">toggled</a>().</p>
<p><table class="generic" width="100%" align="center" cellpadding="2" cellspacing="1" border="0">
<tr valign="top" class="odd"><td><img src="images/plastique-radiobutton.png" alt="Screenshot of a Plastique radio button" /></td><td>A radio button shown in the <a href="gallery-plastique.html">Plastique widget style</a>.</td></tr>
<tr valign="top" class="even"><td><img src="images/windows-radiobutton.png" alt="Screenshot of a Windows XP radio button" /></td><td>A radio button shown in the <a href="gallery-windowsxp.html">Windows XP widget style</a>.</td></tr>
<tr valign="top" class="odd"><td><img src="images/macintosh-radiobutton.png" alt="Screenshot of a Macintosh radio button" /></td><td>A radio button shown in the <a href="gallery-macintosh.html">Macintosh widget style</a>.</td></tr>
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<p>See also <a href="qpushbutton.html">QPushButton</a>, <a href="qtoolbutton.html">QToolButton</a>, <a href="qcheckbox.html">QCheckBox</a>, <a href="guibooks.html#fowler">GUI Design Handbook: Radio Button</a>, and <a href="widgets-groupbox.html">Group Box Example</a>.</p>
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<h2>Member Function Documentation</h2>
<a name="//apple_ref/cpp/instm/QRadioButton/QRadioButton"></a>
<h3 class="fn"><a name="QRadioButton"></a>QRadioButton::QRadioButton ( <a href="qwidget.html">QWidget</a> * <i>parent</i> = 0 )</h3>
<p>Constructs a radio button with the given <i>parent</i>, but with no text or pixmap.</p>
<p>The <i>parent</i> argument is passed on to the <a href="qabstractbutton.html">QAbstractButton</a> constructor.</p>
<h3 class="fn"><a name="QRadioButton-2"></a>QRadioButton::QRadioButton ( const <a href="qstring.html">QString</a> & <i>text</i>, <a href="qwidget.html">QWidget</a> * <i>parent</i> = 0 )</h3>
<p>Constructs a radio button with the given <i>parent</i> and a <i>text</i> string.</p>
<p>The <i>parent</i> argument is passed on to the <a href="qabstractbutton.html">QAbstractButton</a> constructor.</p>
<a name="//apple_ref/cpp/instm/QRadioButton/event"></a>
<h3 class="fn"><a name="event"></a>bool QRadioButton::event ( <a href="qevent.html">QEvent</a> * <i>e</i> ) <tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qobject.html#event">QObject::event</a>().</p>
<a name="//apple_ref/cpp/instm/QRadioButton/hitButton"></a>
<h3 class="fn"><a name="hitButton"></a>bool QRadioButton::hitButton ( const <a href="qpoint.html">QPoint</a> & <i>pos</i> ) const <tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qabstractbutton.html#hitButton">QAbstractButton::hitButton</a>().</p>
<a name="//apple_ref/cpp/instm/QRadioButton/initStyleOption"></a>
<h3 class="fn"><a name="initStyleOption"></a>void QRadioButton::initStyleOption ( <a href="qstyleoptionbutton.html">QStyleOptionButton</a> * <i>option</i> ) const <tt> [protected]</tt></h3>
<p>Initialize <i>option</i> with the values from this <a href="qradiobutton.html">QRadioButton</a>. This method is useful for subclasses when they need a <a href="qstyleoptionbutton.html">QStyleOptionButton</a>, but don't want to fill in all the information themselves.</p>
<p>See also <a href="qstyleoption.html#initFrom">QStyleOption::initFrom</a>().</p>
<a name="//apple_ref/cpp/instm/QRadioButton/mouseMoveEvent"></a>
<h3 class="fn"><a name="mouseMoveEvent"></a>void QRadioButton::mouseMoveEvent ( <a href="qmouseevent.html">QMouseEvent</a> * <i>e</i> ) <tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#mouseMoveEvent">QWidget::mouseMoveEvent</a>().</p>
<a name="//apple_ref/cpp/instm/QRadioButton/paintEvent"></a>
<h3 class="fn"><a name="paintEvent"></a>void QRadioButton::paintEvent ( <a href="qpaintevent.html">QPaintEvent</a> * ) <tt> [virtual protected]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#paintEvent">QWidget::paintEvent</a>().</p>
<a name="//apple_ref/cpp/instm/QRadioButton/sizeHint"></a>
<h3 class="fn"><a name="sizeHint"></a><a href="qsize.html">QSize</a> QRadioButton::sizeHint () const <tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qwidget.html#sizeHint-prop">QWidget::sizeHint</a>().</p>
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