<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qquickpath.cpp --> <title>PathAttribute QML Type | Qt Quick 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="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-qmlmodule.html">QML Types</a></td><td >PathAttribute QML Type</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtquick-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="#properties">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">PathAttribute QML Type</h1> <span class="subtitle"></span> <!-- $$$PathAttribute-brief --> <p>Specifies how to set an attribute at a given position in a Path. <a href="#details">More...</a></p> <!-- @@@PathAttribute --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick 2.12</td></tr></table></div><ul> <li><a href="qml-qtquick-pathattribute-members.html">List of all members, including inherited members</a></li> </ul> <a name="properties"></a> <h2 id="properties">Properties</h2> <ul> <li class="fn"><b><b><a href="qml-qtquick-pathattribute.html#name-prop">name</a></b></b> : string</li> <li class="fn"><b><b><a href="qml-qtquick-pathattribute.html#value-prop">value</a></b></b> : real</li> </ul> <!-- $$$PathAttribute-description --> <a name="details"></a> <h2 id="details">Detailed Description</h2> <p>The <a href="qml-qtquick-pathattribute.html">PathAttribute</a> object allows attributes consisting of a name and a value to be specified for various points along a path. The attributes are exposed to the delegate as Attached Properties. The value of an attribute at any particular point along the path is interpolated from the PathAttributes bounding that point.</p> <p>The example below shows a path with the items scaled to 30% with opacity 50% at the top of the path and scaled 100% with opacity 100% at the bottom. Note the use of the <a href="qml-qtquick-pathview.html">PathView</a>.iconScale and <a href="qml-qtquick-pathview.html">PathView</a>.iconOpacity attached properties to set the scale and opacity of the delegate.</p> <div class="table"><table class="generic"> <tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/declarative-pathattribute.png" alt="" /></p></td><td ><pre class="qml"> import QtQuick 2.0 Rectangle { width: 240; height: 200 Component { id: delegate Item { width: 80; height: 80 scale: PathView.iconScale opacity: PathView.iconOpacity Column { Image { anchors.horizontalCenter: nameText.horizontalCenter; width: 64; height: 64; source: icon } Text { id: nameText; text: name; font.pointSize: 16 } } } } PathView { anchors.fill: parent model: ContactModel {} delegate: delegate path: Path { startX: 120; startY: 100 PathAttribute { name: "iconScale"; value: 1.0 } PathAttribute { name: "iconOpacity"; value: 1.0 } PathQuad { x: 120; y: 25; controlX: 260; controlY: 75 } PathAttribute { name: "iconScale"; value: 0.3 } PathAttribute { name: "iconOpacity"; value: 0.5 } PathQuad { x: 120; y: 100; controlX: -20; controlY: 75 } } } } </pre> <p>(see the <a href="qml-qtquick-pathview.html">PathView</a> documentation for the specification of ContactModel.qml used for ContactModel above.)</p> </td></tr> </table></div> <p><b>See also </b><a href="qml-qtquick-path.html">Path</a>.</p> <!-- @@@PathAttribute --> <h2>Property Documentation</h2> <!-- $$$name --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="name-prop"> <td class="tblQmlPropNode"><p> <a name="name-prop"></a><span class="name">name</span> : <span class="type">string</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>This property holds the name of the attribute to change.</p> <p>This attribute will be available to the delegate as <a href="qml-qtquick-pathview.html">PathView</a>.<name></p> <p>Note that using an existing Item property name such as "opacity" as an attribute is allowed. This is because path attributes add a new Attached Property which in no way clashes with existing properties.</p> </div></div><!-- @@@name --> <br/> <!-- $$$value --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="value-prop"> <td class="tblQmlPropNode"><p> <a name="value-prop"></a><span class="name">value</span> : <span class="type">real</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>This property holds the value for the attribute.</p> <p>The value specified can be used to influence the visual appearance of an item along the path. For example, the following Path specifies an attribute named <i>itemRotation</i>, which has the value <i>0</i> at the beginning of the path, and the value 90 at the end of the path.</p> <pre class="qml"> </pre> <p>In our delegate, we can then bind the <i>rotation</i> property to the Attached Property <i>PathView.itemRotation</i> created for this attribute.</p> <pre class="qml"> </pre> <p>As each item is positioned along the path, it will be rotated accordingly: an item at the beginning of the path with be not be rotated, an item at the end of the path will be rotated 90 degrees, and an item mid-way along the path will be rotated 45 degrees.</p> </div></div><!-- @@@value --> <br/> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. 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