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Breadcrumbs go here --> <li><a href="modules.html">Modules</a></li> <li><a href="qtgui.html">QtGui</a></li> <li>QGraphicsSceneEvent</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="#details">Detailed Description</a></li> </ul> </div> <h1 class="title">QGraphicsSceneEvent Class Reference</h1> <!-- $$$QGraphicsSceneEvent-brief --> <p>The QGraphicsSceneEvent class provides a base class for all graphics view related events. <a href="#details">More...</a></p> <!-- @@@QGraphicsSceneEvent --> <pre class="cpp"> <span class="preprocessor">#include <QGraphicsSceneEvent></span></pre><p><b>Inherits: </b><a href="qevent.html">QEvent</a>.</p> <p><b>Inherited by: </b><a href="qgraphicsscenecontextmenuevent.html">QGraphicsSceneContextMenuEvent</a>, <a href="qgraphicsscenedragdropevent.html">QGraphicsSceneDragDropEvent</a>, <a href="qgraphicsscenehelpevent.html">QGraphicsSceneHelpEvent</a>, <a href="qgraphicsscenehoverevent.html">QGraphicsSceneHoverEvent</a>, <a href="qgraphicsscenemouseevent.html">QGraphicsSceneMouseEvent</a>, <a href="qgraphicsscenemoveevent.html">QGraphicsSceneMoveEvent</a>, <a href="qgraphicssceneresizeevent.html">QGraphicsSceneResizeEvent</a>, and <a href="qgraphicsscenewheelevent.html">QGraphicsSceneWheelEvent</a>.</p> <p>This class was introduced in Qt 4.2.</p> <ul> <li><a href="qgraphicssceneevent-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h2>Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgraphicssceneevent.html#dtor.QGraphicsSceneEvent">~QGraphicsSceneEvent</a></b> ()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QWidget * </td><td class="memItemRight bottomAlign"><b><a href="qgraphicssceneevent.html#widget">widget</a></b> () const</td></tr> </table> <ul> <li class="fn">6 public functions inherited from <a href="qevent.html#public-functions">QEvent</a></li> </ul> <h3>Additional Inherited Members</h3> <ul> <li class="fn">1 property inherited from <a href="qevent.html#properties">QEvent</a></li> <li class="fn">1 static public member inherited from <a href="qevent.html#static-public-members">QEvent</a></li> </ul> <a name="details"></a> <!-- $$$QGraphicsSceneEvent-description --> <div class="descr"> <h2>Detailed Description</h2> <p>The QGraphicsSceneEvent 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="qmouseevent.html">QMouseEvent</a>, <a href="qkeyevent.html">QKeyEvent</a>, QDragEvent, etc.), it translates them into instances of QGraphicsSceneEvent 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="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="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="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="qevent.html">QEvent</a>.</p> <!-- @@@QGraphicsSceneEvent --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$~QGraphicsSceneEvent[overload1]$$$~QGraphicsSceneEvent --> <h3 class="fn"><a name="dtor.QGraphicsSceneEvent"></a>QGraphicsSceneEvent::<span class="name">~QGraphicsSceneEvent</span> ()</h3> <p>Destroys the event.</p> <!-- @@@~QGraphicsSceneEvent --> <!-- $$$widget[overload1]$$$widget --> <h3 class="fn"><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 class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd. 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