<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qcoreevent.cpp --> <title>QChildEvent Class | Qt Core 5.12.2</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 >QChildEvent</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtcore-index.html">Qt 5.12.2 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="#protected-variables">Protected Variables</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">QChildEvent Class</h1> <!-- $$$QChildEvent-brief --> <p>The <a href="qchildevent.html">QChildEvent</a> class contains event parameters for child object events. <a href="#details">More...</a></p> <!-- @@@QChildEvent --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QChildEvent></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="qevent.html">QEvent</a></td></tr></table></div><ul> <li><a href="qchildevent-members.html">List of all members, including inherited 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="qchildevent.html#QChildEvent">QChildEvent</a></b>(QEvent::Type <i>type</i>, QObject *<i>child</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qchildevent.html#added">added</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QObject *</td><td class="memItemRight bottomAlign"><b><a href="qchildevent.html#child">child</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qchildevent.html#polished">polished</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qchildevent.html#removed">removed</a></b>() const</td></tr> </table></div> <ul> <li class="fn">6 public functions inherited from <a href="qevent.html#public-functions">QEvent</a></li> </ul> <a name="protected-variables"></a> <h2 id="protected-variables">Protected Variables</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> QObject *</td><td class="memItemRight bottomAlign"><b><a href="qchildevent.html#c-var">c</a></b></td></tr> </table></div> <h3>Additional Inherited Members</h3> <ul> <li class="fn">1 property inherited from <a href="qevent.html#properties">QEvent</a></li> <li class="fn">1 static public member inherited from <a href="qevent.html#static-public-members">QEvent</a></li> </ul> <a name="details"></a> <!-- $$$QChildEvent-description --> <div class="descr"> <h2 id="details">Detailed Description</h2> <p>The <a href="qchildevent.html">QChildEvent</a> class contains event parameters for child object events.</p> <p>Child events are sent immediately to objects when children are added or removed.</p> <p>In both cases you can only rely on the child being a <a href="qobject.html">QObject</a> (or, if <a href="qobject.html#isWidgetType">QObject::isWidgetType</a>() returns <code>true</code>, a <a href="../qtwidgets/qwidget.html">QWidget</a>). This is because in the <a href="qevent.html#Type-enum">QEvent::ChildAdded</a> case the child is not yet fully constructed; in the <a href="qevent.html#Type-enum">QEvent::ChildRemoved</a> case it might have already been destructed.</p> <p>The handler for these events is <a href="qobject.html#childEvent">QObject::childEvent</a>().</p> </div> <!-- @@@QChildEvent --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QChildEvent[overload1]$$$QChildEventQEvent::TypeQObject* --> <h3 class="fn" id="QChildEvent"><a name="QChildEvent"></a>QChildEvent::<span class="name">QChildEvent</span>(<span class="type"><a href="qevent.html#Type-enum">QEvent::Type</a></span> <i>type</i>, <span class="type"><a href="qobject.html">QObject</a></span> *<i>child</i>)</h3> <p>Constructs a child event object of a particular <i>type</i> for the <i>child</i>.</p> <p><i>type</i> can be <a href="qevent.html#Type-enum">QEvent::ChildAdded</a>, <a href="qevent.html#Type-enum">QEvent::ChildRemoved</a>, or <a href="qevent.html#Type-enum">QEvent::ChildPolished</a>.</p> <p><b>See also </b><a href="qchildevent.html#child">child</a>().</p> <!-- @@@QChildEvent --> <!-- $$$added[overload1]$$$added --> <h3 class="fn" id="added"><a name="added"></a><span class="type">bool</span> QChildEvent::<span class="name">added</span>() const</h3> <p>Returns <code>true</code> if <a href="qevent.html#type">type</a>() is <a href="qevent.html#Type-enum">QEvent::ChildAdded</a>; otherwise returns false.</p> <!-- @@@added --> <!-- $$$child[overload1]$$$child --> <h3 class="fn" id="child"><a name="child"></a><span class="type"><a href="qobject.html">QObject</a></span> *QChildEvent::<span class="name">child</span>() const</h3> <p>Returns the child object that was added or removed.</p> <!-- @@@child --> <!-- $$$polished[overload1]$$$polished --> <h3 class="fn" id="polished"><a name="polished"></a><span class="type">bool</span> QChildEvent::<span class="name">polished</span>() const</h3> <p>Returns <code>true</code> if <a href="qevent.html#type">type</a>() is <a href="qevent.html#Type-enum">QEvent::ChildPolished</a>; otherwise returns false.</p> <!-- @@@polished --> <!-- $$$removed[overload1]$$$removed --> <h3 class="fn" id="removed"><a name="removed"></a><span class="type">bool</span> QChildEvent::<span class="name">removed</span>() const</h3> <p>Returns <code>true</code> if <a href="qevent.html#type">type</a>() is <a href="qevent.html#Type-enum">QEvent::ChildRemoved</a>; otherwise returns false.</p> <!-- @@@removed --> </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>