<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- qgraphicssceneevent.cpp -->
<title>QGraphicsSceneEvent Class | Qt Widgets 5.9</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 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-module.html">C++ Classes</a></td><td >QGraphicsSceneEvent</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</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="#details">Detailed Description</a></li>
</ul>
</div>
<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">QGraphicsSceneEvent Class</h1>
<!-- $$$QGraphicsSceneEvent-brief -->
<p>The <a href="qgraphicssceneevent.html">QGraphicsSceneEvent</a> class provides a base class for all graphics view related events. <a href="#details">More...</a></p>
<!-- @@@QGraphicsSceneEvent -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QGraphicsSceneEvent></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += widgets</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 4.2</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="../qtcore/qevent.html">QEvent</a></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherited By:</td><td class="memItemRight bottomAlign"> <p><a href="qgraphicsscenecontextmenuevent.html">QGraphicsSceneContextMenuEvent</a>, <a href="qgraphicsscenedragdropevent.html">QGraphicsSceneDragDropEvent</a>, <a href="qgraphicsscenehelpevent.html">QGraphicsSceneHelpEvent</a>, <a href="qgraphicsscenehoverevent.html">QGraphicsSceneHoverEvent</a>, <a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a>, <a href="qgraphicsscenemoveevent.html">QGraphicsSceneMoveEvent</a>, <a href="qgraphicssceneresizeevent.html">QGraphicsSceneResizeEvent</a>, and <a href="qgraphicsscenewheelevent.html">QGraphicsSceneWheelEvent</a></p>
</td></tr></table></div><ul>
<li><a href="qgraphicssceneevent-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="qgraphicssceneevent.html#dtor.QGraphicsSceneEvent">~QGraphicsSceneEvent</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QWidget *</td><td class="memItemRight bottomAlign"><b><a href="qgraphicssceneevent.html#widget">widget</a></b>() const</td></tr>
</table></div>
<ul>
<li class="fn">6 public functions inherited from <a href="../qtcore/qevent.html#public-functions">QEvent</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 property inherited from <a href="../qtcore/qevent.html#properties">QEvent</a></li>
<li class="fn">1 static public member inherited from <a href="../qtcore/qevent.html#static-public-members">QEvent</a></li>
<li class="fn">2 protected variables inherited from <a href="../qtcore/qevent.html#protected-variables">QEvent</a></li>
</ul>
<a name="details"></a>
<!-- $$$QGraphicsSceneEvent-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qgraphicssceneevent.html">QGraphicsSceneEvent</a> class provides a base class for all graphics view related events.</p>
<p>When a <a href="qgraphicsview.html">QGraphicsView</a> receives Qt mouse, keyboard, and drag and drop events (<a href="../qtgui/qmouseevent.html">QMouseEvent</a>, <a href="../qtgui/qkeyevent.html">QKeyEvent</a>, QDragEvent, etc.), it translates them into instances of <a href="qgraphicssceneevent.html">QGraphicsSceneEvent</a> subclasses and forwards them to the <a href="qgraphicsscene.html">QGraphicsScene</a> it displays. The scene then forwards the events to the relevant items.</p>
<p>For example, when a <a href="qgraphicsview.html">QGraphicsView</a> receives a <a href="../qtgui/qmouseevent.html">QMouseEvent</a> of type MousePress as a response to a user click, the view sends a <a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a> of type <a href="../qtcore/qevent.html#Type-enum">GraphicsSceneMousePress</a> to the underlying <a href="qgraphicsscene.html">QGraphicsScene</a> through its <a href="qgraphicsscene.html#mousePressEvent">mousePressEvent()</a> function. The default <a href="qgraphicsscene.html#mousePressEvent">QGraphicsScene::mousePressEvent</a>() implementation determines which item was clicked and forwards the event to <a href="qgraphicsitem.html#mousePressEvent">QGraphicsItem::mousePressEvent</a>().</p>
<p>Subclasses such as <a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a> and <a href="qgraphicsscenecontextmenuevent.html">QGraphicsSceneContextMenuEvent</a> provide the coordinates from the original <a href="../qtcore/qevent.html">QEvent</a> in screen, scene, and item coordinates (see <a href="qgraphicsscenemouseevent.html#screenPos">screenPos()</a>, <a href="qgraphicsscenemouseevent.html#scenePos">scenePos()</a>, and <a href="qgraphicsscenemouseevent.html#pos">pos()</a>). The item coordinates are set by the <a href="qgraphicsscene.html">QGraphicsScene</a> before it forwards the event to the event to a <a href="qgraphicsitem.html">QGraphicsItem</a>. The mouse events also add the possibility to retrieve the coordinates from the last event received by the view (see <a href="qgraphicsscenemouseevent.html#lastScreenPos">lastScreenPos()</a>, <a href="qgraphicsscenemouseevent.html#lastScenePos">lastScenePos()</a>, and <a href="qgraphicsscenemouseevent.html#lastPos">lastPos()</a>).</p>
</div>
<p><b>See also </b><a href="../qtcore/qevent.html">QEvent</a>.</p>
<!-- @@@QGraphicsSceneEvent -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$~QGraphicsSceneEvent[overload1]$$$~QGraphicsSceneEvent -->
<h3 class="fn" id="dtor.QGraphicsSceneEvent"><a name="dtor.QGraphicsSceneEvent"></a>QGraphicsSceneEvent::<span class="name">~QGraphicsSceneEvent</span>()</h3>
<p>Destroys the event.</p>
<!-- @@@~QGraphicsSceneEvent -->
<!-- $$$widget[overload1]$$$widget -->
<h3 class="fn" id="widget"><a name="widget"></a><span class="type"><a href="qwidget.html">QWidget</a></span> *QGraphicsSceneEvent::<span class="name">widget</span>() const</h3>
<p>Returns the widget where the event originated, or 0 if the event originates from another application.</p>
<!-- @@@widget -->
</div>
</div>
</div>
</div>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2017 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>
distrib
>
Mageia
>
6
>
armv5tl
>
media
>
core-updates
>
by-pkgid
>
768f7d9f703884aa2562bf0a651086df
>
files
>
3361
