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Breadcrumbs go here --> <li><a href="modules.html">Modules</a></li> <li><a href="qtcore.html">QtCore</a></li> <li>QSignalMapper</li> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#public-functions">Public Functions</a></li> <li class="level1"><a href="#public-slots">Public Slots</a></li> <li class="level1"><a href="#signals">Signals</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <h1 class="title">QSignalMapper Class Reference</h1> <!-- $$$QSignalMapper-brief --> <p>The QSignalMapper class bundles signals from identifiable senders. <a href="#details">More...</a></p> <!-- @@@QSignalMapper --> <pre class="cpp"> <span class="preprocessor">#include <QSignalMapper></span></pre><p><b>Inherits: </b><a href="qobject.html">QObject</a>.</p> <ul> <li><a href="qsignalmapper-members.html">List of all members, including inherited members</a></li> <li><a href="qsignalmapper-qt3.html">Qt 3 support members</a></li> </ul> <a name="public-functions"></a> <h2>Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#QSignalMapper">QSignalMapper</a></b> ( QObject * <i>parent</i> = 0 )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#dtor.QSignalMapper">~QSignalMapper</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QObject * </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#mapping">mapping</a></b> ( int <i>id</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QObject * </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#mapping-2">mapping</a></b> ( const QString & <i>id</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QObject * </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#mapping-3">mapping</a></b> ( QWidget * <i>widget</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QObject * </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#mapping-4">mapping</a></b> ( QObject * <i>object</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#removeMappings">removeMappings</a></b> ( QObject * <i>sender</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#setMapping">setMapping</a></b> ( QObject * <i>sender</i>, int <i>id</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#setMapping-2">setMapping</a></b> ( QObject * <i>sender</i>, const QString & <i>text</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#setMapping-3">setMapping</a></b> ( QObject * <i>sender</i>, QWidget * <i>widget</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#setMapping-4">setMapping</a></b> ( QObject * <i>sender</i>, QObject * <i>object</i> )</td></tr> </table> <ul> <li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li> </ul> <a name="public-slots"></a> <h2>Public Slots</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#map">map</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#map-2">map</a></b> ( QObject * <i>sender</i> )</td></tr> </table> <ul> <li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li> </ul> <a name="signals"></a> <h2>Signals</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#mapped">mapped</a></b> ( int <i>i</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#mapped-2">mapped</a></b> ( const QString & <i>text</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#mapped-3">mapped</a></b> ( QWidget * <i>widget</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#mapped-4">mapped</a></b> ( QObject * <i>object</i> )</td></tr> </table> <ul> <li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li> </ul> <h3>Additional Inherited Members</h3> <ul> <li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li> <li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li> <li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li> </ul> <a name="details"></a> <!-- $$$QSignalMapper-description --> <div class="descr"> <h2>Detailed Description</h2> <p>The QSignalMapper class bundles signals from identifiable senders.</p> <p>This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal.</p> <p>The class supports the mapping of particular strings or integers with particular objects using <a href="qsignalmapper.html#setMapping">setMapping</a>(). The objects' signals can then be connected to the <a href="qsignalmapper.html#map">map</a>() slot which will emit the <a href="qsignalmapper.html#mapped">mapped</a>() signal with the string or integer associated with the original signalling object. Mappings can be removed later using <a href="qsignalmapper.html#removeMappings">removeMappings</a>().</p> <p>Example: Suppose we want to create a custom widget that contains a group of buttons (like a tool palette). One approach is to connect each button's <tt>clicked()</tt> signal to its own custom slot; but in this example we want to connect all the buttons to a single slot and parameterize the slot by the button that was clicked.</p> <p>Here's the definition of a simple custom widget that has a single signal, <tt>clicked()</tt>, which is emitted with the text of the button that was clicked:</p> <pre class="cpp"> <span class="keyword">class</span> ButtonWidget : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> { Q_OBJECT <span class="keyword">public</span>: ButtonWidget(<span class="type"><a href="qstringlist.html">QStringList</a></span> texts<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>); <span class="keyword">signals</span>: <span class="type">void</span> clicked(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>text); <span class="keyword">private</span>: <span class="type">QSignalMapper</span> <span class="operator">*</span>signalMapper; };</pre> <p>The only function that we need to implement is the constructor:</p> <pre class="cpp"> ButtonWidget<span class="operator">::</span>ButtonWidget(<span class="type"><a href="qstringlist.html">QStringList</a></span> texts<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qwidget.html">QWidget</a></span>(parent) { signalMapper <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QSignalMapper</span>(<span class="keyword">this</span>); <span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>gridLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>; <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> texts<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(texts<span class="operator">[</span>i<span class="operator">]</span>); connect(button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> signalMapper<span class="operator">,</span> SLOT(map())); signalMapper<span class="operator">-</span><span class="operator">></span>setMapping(button<span class="operator">,</span> texts<span class="operator">[</span>i<span class="operator">]</span>); gridLayout<span class="operator">-</span><span class="operator">></span>addWidget(button<span class="operator">,</span> i <span class="operator">/</span> <span class="number">3</span><span class="operator">,</span> i <span class="operator">%</span> <span class="number">3</span>); } connect(signalMapper<span class="operator">,</span> SIGNAL(mapped(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(clicked(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>))); setLayout(gridLayout); }</pre> <p>A list of texts is passed to the constructor. A signal mapper is constructed and for each text in the list a <a href="qpushbutton.html">QPushButton</a> is created. We connect each button's <tt>clicked()</tt> signal to the signal mapper's <a href="qsignalmapper.html#map">map</a>() slot, and create a mapping in the signal mapper from each button to the button's text. Finally we connect the signal mapper's <a href="qsignalmapper.html#mapped">mapped</a>() signal to the custom widget's <tt>clicked()</tt> signal. When the user clicks a button, the custom widget will emit a single <tt>clicked()</tt> signal whose argument is the text of the button the user clicked.</p> </div> <p><b>See also </b><a href="qobject.html">QObject</a>, <a href="qbuttongroup.html">QButtonGroup</a>, and <a href="qactiongroup.html">QActionGroup</a>.</p> <!-- @@@QSignalMapper --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QSignalMapper[overload1]$$$QSignalMapperQObject* --> <h3 class="fn"><a name="QSignalMapper"></a>QSignalMapper::<span class="name">QSignalMapper</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3> <p>Constructs a <a href="qsignalmapper.html">QSignalMapper</a> with parent <i>parent</i>.</p> <!-- @@@QSignalMapper --> <!-- $$$~QSignalMapper[overload1]$$$~QSignalMapper --> <h3 class="fn"><a name="dtor.QSignalMapper"></a>QSignalMapper::<span class="name">~QSignalMapper</span> ()</h3> <p>Destroys the <a href="qsignalmapper.html">QSignalMapper</a>.</p> <!-- @@@~QSignalMapper --> <!-- $$$map[overload1]$$$map --> <h3 class="fn"><a name="map"></a><span class="type">void</span> QSignalMapper::<span class="name">map</span> ()<tt> [slot]</tt></h3> <p>This slot emits signals based on which object sends signals to it.</p> <!-- @@@map --> <!-- $$$map$$$mapQObject* --> <h3 class="fn"><a name="map-2"></a><span class="type">void</span> QSignalMapper::<span class="name">map</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>sender</i> )<tt> [slot]</tt></h3> <p>This slot emits signals based on the <i>sender</i> object.</p> <!-- @@@map --> <!-- $$$mapped[overload1]$$$mappedint --> <h3 class="fn"><a name="mapped"></a><span class="type">void</span> QSignalMapper::<span class="name">mapped</span> ( <span class="type">int</span> <i>i</i> )<tt> [signal]</tt></h3> <p>This signal is emitted when <a href="qsignalmapper.html#map">map</a>() is signalled from an object that has an integer mapping set. The object's mapped integer is passed in <i>i</i>.</p> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapped --> <!-- $$$mapped$$$mappedconstQString& --> <h3 class="fn"><a name="mapped-2"></a><span class="type">void</span> QSignalMapper::<span class="name">mapped</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>text</i> )<tt> [signal]</tt></h3> <p>This signal is emitted when <a href="qsignalmapper.html#map">map</a>() is signalled from an object that has a string mapping set. The object's mapped string is passed in <i>text</i>.</p> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapped --> <!-- $$$mapped$$$mappedQWidget* --> <h3 class="fn"><a name="mapped-3"></a><span class="type">void</span> QSignalMapper::<span class="name">mapped</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )<tt> [signal]</tt></h3> <p>This signal is emitted when <a href="qsignalmapper.html#map">map</a>() is signalled from an object that has a widget mapping set. The object's mapped widget is passed in <i>widget</i>.</p> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapped --> <!-- $$$mapped$$$mappedQObject* --> <h3 class="fn"><a name="mapped-4"></a><span class="type">void</span> QSignalMapper::<span class="name">mapped</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>object</i> )<tt> [signal]</tt></h3> <p>This signal is emitted when <a href="qsignalmapper.html#map">map</a>() is signalled from an object that has an object mapping set. The object provided by the map is passed in <i>object</i>.</p> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapped --> <!-- $$$mapping[overload1]$$$mappingint --> <h3 class="fn"><a name="mapping"></a><span class="type"><a href="qobject.html">QObject</a></span> * QSignalMapper::<span class="name">mapping</span> ( <span class="type">int</span> <i>id</i> ) const</h3> <p>Returns the sender <a href="qobject.html">QObject</a> that is associated with the <i>id</i>.</p> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapping --> <!-- $$$mapping$$$mappingconstQString& --> <h3 class="fn"><a name="mapping-2"></a><span class="type"><a href="qobject.html">QObject</a></span> * QSignalMapper::<span class="name">mapping</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>id</i> ) const</h3> <p>This function overloads <a href="qsignalmapper.html#mapping">mapping</a>().</p> <!-- @@@mapping --> <!-- $$$mapping$$$mappingQWidget* --> <h3 class="fn"><a name="mapping-3"></a><span class="type"><a href="qobject.html">QObject</a></span> * QSignalMapper::<span class="name">mapping</span> ( <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> ) const</h3> <p>This function overloads <a href="qsignalmapper.html#mapping">mapping</a>().</p> <p>Returns the sender <a href="qobject.html">QObject</a> that is associated with the <i>widget</i>.</p> <!-- @@@mapping --> <!-- $$$mapping$$$mappingQObject* --> <h3 class="fn"><a name="mapping-4"></a><span class="type"><a href="qobject.html">QObject</a></span> * QSignalMapper::<span class="name">mapping</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>object</i> ) const</h3> <p>This function overloads <a href="qsignalmapper.html#mapping">mapping</a>().</p> <p>Returns the sender <a href="qobject.html">QObject</a> that is associated with the <i>object</i>.</p> <!-- @@@mapping --> <!-- $$$removeMappings[overload1]$$$removeMappingsQObject* --> <h3 class="fn"><a name="removeMappings"></a><span class="type">void</span> QSignalMapper::<span class="name">removeMappings</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>sender</i> )</h3> <p>Removes all mappings for <i>sender</i>.</p> <p>This is done automatically when mapped objects are destroyed.</p> <!-- @@@removeMappings --> <!-- $$$setMapping[overload1]$$$setMappingQObject*int --> <h3 class="fn"><a name="setMapping"></a><span class="type">void</span> QSignalMapper::<span class="name">setMapping</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>sender</i>, <span class="type">int</span> <i>id</i> )</h3> <p>Adds a mapping so that when <a href="qsignalmapper.html#map">map</a>() is signalled from the given <i>sender</i>, the signal mapped(<i>id</i>) is emitted.</p> <p>There may be at most one integer ID for each sender.</p> <p><b>See also </b><a href="qsignalmapper.html#mapping">mapping</a>().</p> <!-- @@@setMapping --> <!-- $$$setMapping$$$setMappingQObject*constQString& --> <h3 class="fn"><a name="setMapping-2"></a><span class="type">void</span> QSignalMapper::<span class="name">setMapping</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>sender</i>, const <span class="type"><a href="qstring.html">QString</a></span> & <i>text</i> )</h3> <p>Adds a mapping so that when <a href="qsignalmapper.html#map">map</a>() is signalled from the <i>sender</i>, the signal mapped(<i>text</i> ) is emitted.</p> <p>There may be at most one text for each sender.</p> <!-- @@@setMapping --> <!-- $$$setMapping$$$setMappingQObject*QWidget* --> <h3 class="fn"><a name="setMapping-3"></a><span class="type">void</span> QSignalMapper::<span class="name">setMapping</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>sender</i>, <span class="type"><a href="qwidget.html">QWidget</a></span> * <i>widget</i> )</h3> <p>Adds a mapping so that when <a href="qsignalmapper.html#map">map</a>() is signalled from the <i>sender</i>, the signal mapped(<i>widget</i> ) is emitted.</p> <p>There may be at most one widget for each sender.</p> <!-- @@@setMapping --> <!-- $$$setMapping$$$setMappingQObject*QObject* --> <h3 class="fn"><a name="setMapping-4"></a><span class="type">void</span> QSignalMapper::<span class="name">setMapping</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>sender</i>, <span class="type"><a href="qobject.html">QObject</a></span> * <i>object</i> )</h3> <p>Adds a mapping so that when <a href="qsignalmapper.html#map">map</a>() is signalled from the <i>sender</i>, the signal mapped(<i>object</i> ) is emitted.</p> <p>There may be at most one object for each sender.</p> <!-- @@@setMapping --> </div> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.</p> <br /> <p> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.</p> <p> Documentation sources may be obtained from <a href="http://www.qt-project.org"> www.qt-project.org</a>.</p> <br /> <p> Qt and respective logos are trademarks of The Qt Company Ltd in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. <a title="Privacy Policy" href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p> </div> <script src="scripts/functions.js" type="text/javascript"></script> </body> </html>