<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qquickpositioners.cpp --> <title>Positioner QML Type | Qt Quick 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="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-qmlmodule.html">QML Types</a></td><td >Positioner QML Type</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="#attached-properties">Attached Properties</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">Positioner QML Type</h1> <span class="subtitle"></span> <!-- $$$Positioner-brief --> <p>Provides attached properties that contain details on where an item exists in a positioner <a href="#details">More...</a></p> <!-- @@@Positioner --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick 2.7</td></tr></table></div><ul> <li><a href="qml-qtquick-positioner-members.html">List of all members, including inherited members</a></li> </ul> <a name="attached-properties"></a> <h2 id="attached-properties">Attached Properties</h2> <ul> <li class="fn"><b><b><a href="qml-qtquick-positioner.html#index-attached-prop">index</a></b></b> : int</li> <li class="fn"><b><b><a href="qml-qtquick-positioner.html#isFirstItem-attached-prop">isFirstItem</a></b></b> : bool</li> <li class="fn"><b><b><a href="qml-qtquick-positioner.html#isLastItem-attached-prop">isLastItem</a></b></b> : bool</li> </ul> <!-- $$$Positioner-description --> <a name="details"></a> <h2 id="details">Detailed Description</h2> <p>An object of type Positioner is attached to the top-level child item within a Column, Row, Flow or Grid. It provides properties that allow a child item to determine where it exists within the layout of its parent Column, Row, Flow or Grid.</p> <p>For example, below is a <a href="qtquick-positioning-layouts.html#grid">Grid</a> with 16 child rectangles, as created through a <a href="qml-qtquick-repeater.html">Repeater</a>. Each <a href="qml-qtquick-rectangle.html">Rectangle</a> displays its index in the Grid using <a href="qml-qtquick-positioner.html#index-attached-prop">Positioner.index</a>, and the first item is colored differently by taking <a href="qml-qtquick-positioner.html#isFirstItem-attached-prop">Positioner.isFirstItem</a> into account:</p> <pre class="cpp"> Grid { Repeater { model: <span class="number">16</span> Rectangle { id: rect width: <span class="number">30</span>; height: <span class="number">30</span> border<span class="operator">.</span>width: <span class="number">1</span> color: Positioner<span class="operator">.</span>isFirstItem <span class="operator">?</span> <span class="string">"yellow"</span> : <span class="string">"lightsteelblue"</span> Text { text: rect<span class="operator">.</span>Positioner<span class="operator">.</span>index } } } } </pre> <p class="centerAlign"><img src="images/positioner-example.png" alt="" /></p><!-- @@@Positioner --> <h2>Attached Property Documentation</h2> <!-- $$$index --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="index-attached-prop"> <td class="tblQmlPropNode"><p> <a name="index-attached-prop"></a><span class="name">Positioner.index</span> : <span class="type">int</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>This property allows the item to determine its index within the positioner.</p> </div></div><!-- @@@index --> <br/> <!-- $$$isFirstItem --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="isFirstItem-attached-prop"> <td class="tblQmlPropNode"><p> <a name="isFirstItem-attached-prop"></a><span class="name">Positioner.isFirstItem</span> : <span class="type">bool</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>These properties allow the item to determine if it is the first or last item in the positioner, respectively.</p> </div></div><!-- @@@isFirstItem --> <br/> <!-- $$$isLastItem --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="isLastItem-attached-prop"> <td class="tblQmlPropNode"><p> <a name="isLastItem-attached-prop"></a><span class="name">Positioner.isLastItem</span> : <span class="type">bool</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>These properties allow the item to determine if it is the first or last item in the positioner, respectively.</p> </div></div><!-- @@@isLastItem --> <br/> </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>