<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qsignalmapper.cpp --> <title>QSignalMapper Class | Qt Core 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QSignalMapper</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtcore-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <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="#static-public-members">Static Public Members</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">QSignalMapper Class</h1> <!-- $$$QSignalMapper-brief --> <p>The <a href="qsignalmapper.html">QSignalMapper</a> class bundles signals from identifiable senders. <a href="#details">More...</a></p> <!-- @@@QSignalMapper --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QSignalMapper></span> </td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += core</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qobject.html">QObject</a></td></tr></table></div><p><b>This class is obsolete.</b> It is provided to keep old source code working. We strongly advise against using it in new code.</p> <ul> <li><a href="qsignalmapper-members.html">List of all members, including inherited members</a></li> <li><a href="qsignalmapper-obsolete.html">Obsolete members</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="qsignalmapper.html#QSignalMapper">QSignalMapper</a></b>(QObject *<i>parent</i> = nullptr)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual </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-1">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-2">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-3">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-1">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-2">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-3">setMapping</a></b>(QObject *<i>sender</i>, QObject *<i>object</i>)</td></tr> </table></div> <ul> <li class="fn">32 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li> </ul> <a name="public-slots"></a> <h2 id="public-slots">Public Slots</h2> <div class="table"><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-1">map</a></b>(QObject *<i>sender</i>)</td></tr> </table></div> <ul> <li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li> </ul> <a name="signals"></a> <h2 id="signals">Signals</h2> <div class="table"><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-1">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-2">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-3">mapped</a></b>(QObject *<i>object</i>)</td></tr> </table></div> <ul> <li class="fn">2 signals inherited from <a href="qobject.html#signals">QObject</a></li> </ul> <a name="static-public-members"></a> <h2 id="static-public-members">Static Public Members</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qsignalmapper.html#staticMetaObject-var">staticMetaObject</a></b></td></tr> </table></div> <ul> <li class="fn">10 static public members inherited from <a href="qobject.html#static-public-members">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">9 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li> </ul> <a name="details"></a> <!-- $$$QSignalMapper-description --> <div class="descr"> <h2 id="details">Detailed Description</h2> <p>The <a href="qsignalmapper.html">QSignalMapper</a> 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 <code>clicked()</code> 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, <code>clicked()</code>, 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="../qtwidgets/qwidget.html">QWidget</a></span> { Q_OBJECT <span class="keyword">public</span>: ButtonWidget(<span class="keyword">const</span> <span class="type"><a href="qstringlist.html">QStringList</a></span> <span class="operator">&</span>texts<span class="operator">,</span> <span class="type"><a href="../qtwidgets/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"><a href="qsignalmapper.html#QSignalMapper">QSignalMapper</a></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="keyword">const</span> <span class="type"><a href="qstringlist.html">QStringList</a></span> <span class="operator">&</span>texts<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span>(parent) { signalMapper <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsignalmapper.html#QSignalMapper">QSignalMapper</a></span>(<span class="keyword">this</span>); <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>gridLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/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="../qtwidgets/qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/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="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(clicked(<span class="type"><a href="qstring.html">QString</a></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="../qtwidgets/qpushbutton.html">QPushButton</a> is created. We connect each button's <code>clicked()</code> 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 <code>clicked()</code> signal. When the user clicks a button, the custom widget will emit a single <code>clicked()</code> signal whose argument is the text of the button the user clicked.</p> <p>This class was mostly useful before lambda functions could be used as slots. The example above can be rewritten simpler without <a href="qsignalmapper.html">QSignalMapper</a> by connecting to a lambda function.</p> <pre class="cpp"> ButtonWidget<span class="operator">::</span>ButtonWidget(<span class="keyword">const</span> <span class="type"><a href="qstringlist.html">QStringList</a></span> <span class="operator">&</span>texts<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span>(parent) { <span class="type"><a href="../qtwidgets/qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>gridLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/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="qstring.html">QString</a></span> text <span class="operator">=</span> texts<span class="operator">[</span>i<span class="operator">]</span>; <span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span>(text); connect(button<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtwidgets/qpushbutton.html">QPushButton</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span> { clicked(text); }); 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>); } setLayout(gridLayout); } </pre> </div> <p><b>See also </b><a href="qobject.html">QObject</a>, <a href="../qtwidgets/qbuttongroup.html">QButtonGroup</a>, and <a href="../qtwidgets/qactiongroup.html">QActionGroup</a>.</p> <!-- @@@QSignalMapper --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QSignalMapper[overload1]$$$QSignalMapperQObject* --> <h3 class="fn" id="QSignalMapper"><a name="QSignalMapper"></a>QSignalMapper::<span class="name">QSignalMapper</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3> <p>Constructs a <a href="qsignalmapper.html" class="obsolete">QSignalMapper</a> with parent <i>parent</i>.</p> <!-- @@@QSignalMapper --> <!-- $$$~QSignalMapper[overload1]$$$~QSignalMapper --> <h3 class="fn" id="dtor.QSignalMapper"><a name="dtor.QSignalMapper"></a><code>[virtual] </code>QSignalMapper::<span class="name">~QSignalMapper</span>()</h3> <p>Destroys the <a href="qsignalmapper.html" class="obsolete">QSignalMapper</a>.</p> <!-- @@@~QSignalMapper --> <!-- $$$map[overload1]$$$map --> <h3 class="fn" id="map"><a name="map"></a><code>[slot] </code><span class="type">void</span> QSignalMapper::<span class="name">map</span>()</h3> <p>This slot emits signals based on which object sends signals to it.</p> <!-- @@@map --> <!-- $$$map$$$mapQObject* --> <h3 class="fn" id="map-1"><a name="map-1"></a><code>[slot] </code><span class="type">void</span> QSignalMapper::<span class="name">map</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>sender</i>)</h3> <p>This slot emits signals based on the <i>sender</i> object.</p> <!-- @@@map --> <!-- $$$mapped[overload1]$$$mappedint --> <h3 class="fn" id="mapped"><a name="mapped"></a><code>[signal] </code><span class="type">void</span> QSignalMapper::<span class="name">mapped</span>(<span class="type">int</span> <i>i</i>)</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>Note:</b> Signal <i>mapped</i> is overloaded in this class. To connect to this signal by using the function pointer syntax, Qt provides a convenient helper for obtaining the function pointer as shown in this example:<pre class="cpp"> connect(signalMapper<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type">int</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qsignalmapper.html#QSignalMapper">QSignalMapper</a></span><span class="operator">::</span>mapped)<span class="operator">,</span> <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span>(<span class="type">int</span> i){ <span class="comment">/* ... */</span> }); </pre> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapped --> <!-- $$$mapped$$$mappedconstQString& --> <h3 class="fn" id="mapped-1"><a name="mapped-1"></a><code>[signal] </code><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>)</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>Note:</b> Signal <i>mapped</i> is overloaded in this class. To connect to this signal by using the function pointer syntax, Qt provides a convenient helper for obtaining the function pointer as shown in this example:<pre class="cpp"> connect(signalMapper<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><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="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qsignalmapper.html#QSignalMapper">QSignalMapper</a></span><span class="operator">::</span>mapped)<span class="operator">,</span> <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span>(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>text){ <span class="comment">/* ... */</span> }); </pre> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapped --> <!-- $$$mapped$$$mappedQWidget* --> <h3 class="fn" id="mapped-2"><a name="mapped-2"></a><code>[signal] </code><span class="type">void</span> QSignalMapper::<span class="name">mapped</span>(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> *<i>widget</i>)</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>Note:</b> Signal <i>mapped</i> is overloaded in this class. To connect to this signal by using the function pointer syntax, Qt provides a convenient helper for obtaining the function pointer as shown in this example:<pre class="cpp"> connect(signalMapper<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qsignalmapper.html#QSignalMapper">QSignalMapper</a></span><span class="operator">::</span>mapped)<span class="operator">,</span> <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span>(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>widget){ <span class="comment">/* ... */</span> }); </pre> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapped --> <!-- $$$mapped$$$mappedQObject* --> <h3 class="fn" id="mapped-3"><a name="mapped-3"></a><code>[signal] </code><span class="type">void</span> QSignalMapper::<span class="name">mapped</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>object</i>)</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>Note:</b> Signal <i>mapped</i> is overloaded in this class. To connect to this signal by using the function pointer syntax, Qt provides a convenient helper for obtaining the function pointer as shown in this example:<pre class="cpp"> connect(signalMapper<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="qobject.html#QObject">QObject</a></span> <span class="operator">*</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qsignalmapper.html#QSignalMapper">QSignalMapper</a></span><span class="operator">::</span>mapped)<span class="operator">,</span> <span class="operator">[</span><span class="operator">=</span><span class="operator">]</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> <span class="operator">*</span>object){ <span class="comment">/* ... */</span> }); </pre> <p><b>See also </b><a href="qsignalmapper.html#setMapping">setMapping</a>().</p> <!-- @@@mapped --> <!-- $$$mapping[overload1]$$$mappingint --> <h3 class="fn" id="mapping"><a name="mapping"></a><span class="type"><a href="qobject.html#QObject">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" id="mapping-1"><a name="mapping-1"></a><span class="type"><a href="qobject.html#QObject">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" id="mapping-2"><a name="mapping-2"></a><span class="type"><a href="qobject.html#QObject">QObject</a></span> *QSignalMapper::<span class="name">mapping</span>(<span class="type"><a href="../qtwidgets/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" id="mapping-3"><a name="mapping-3"></a><span class="type"><a href="qobject.html#QObject">QObject</a></span> *QSignalMapper::<span class="name">mapping</span>(<span class="type"><a href="qobject.html#QObject">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" id="removeMappings"><a name="removeMappings"></a><span class="type">void</span> QSignalMapper::<span class="name">removeMappings</span>(<span class="type"><a href="qobject.html#QObject">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> <p><b>Note: </b>This does not disconnect any signals. If <i>sender</i> is not destroyed then this will need to be done explicitly if required.</p><!-- @@@removeMappings --> <!-- $$$setMapping[overload1]$$$setMappingQObject*int --> <h3 class="fn" id="setMapping"><a name="setMapping"></a><span class="type">void</span> QSignalMapper::<span class="name">setMapping</span>(<span class="type"><a href="qobject.html#QObject">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" id="setMapping-1"><a name="setMapping-1"></a><span class="type">void</span> QSignalMapper::<span class="name">setMapping</span>(<span class="type"><a href="qobject.html#QObject">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" id="setMapping-2"><a name="setMapping-2"></a><span class="type">void</span> QSignalMapper::<span class="name">setMapping</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>sender</i>, <span class="type"><a href="../qtwidgets/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" id="setMapping-3"><a name="setMapping-3"></a><span class="type">void</span> QSignalMapper::<span class="name">setMapping</span>(<span class="type"><a href="qobject.html#QObject">QObject</a></span> *<i>sender</i>, <span class="type"><a href="qobject.html#QObject">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> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> 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.<br/> 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. </p> </div> </body> </html>