<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qquickanimation.cpp --> <title>PropertyAction 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 >PropertyAction 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="#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">PropertyAction QML Type</h1> <span class="subtitle"></span> <!-- $$$PropertyAction-brief --> <p>Specifies immediate property changes during animation <a href="#details">More...</a></p> <!-- @@@PropertyAction --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick 2.7</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtquick-animation.html">Animation</a></p> </td></tr></table></div><ul> <li><a href="qml-qtquick-propertyaction-members.html">List of all members, including inherited members</a></li> </ul> <a name="properties"></a> <h2 id="properties">Properties</h2> <ul> <li class="fn"><b><b><a href="qml-qtquick-propertyaction.html#exclude-prop">exclude</a></b></b> : list<Object></li> <li class="fn"><b><b><a href="qml-qtquick-propertyaction.html#properties-prop">properties</a></b></b> : string</li> <li class="fn"><b><b><a href="qml-qtquick-propertyaction.html#property-prop">property</a></b></b> : string</li> <li class="fn"><b><b><a href="qml-qtquick-propertyaction.html#target-prop">target</a></b></b> : Object</li> <li class="fn"><b><b><a href="qml-qtquick-propertyaction.html#targets-prop">targets</a></b></b> : list<Object></li> <li class="fn"><b><b><a href="qml-qtquick-propertyaction.html#value-prop">value</a></b></b> : any</li> </ul> <!-- $$$PropertyAction-description --> <a name="details"></a> <h2 id="details">Detailed Description</h2> <p><a href="qml-qtquick-propertyaction.html">PropertyAction</a> is used to specify an immediate property change during an animation. The property change is not animated.</p> <p>It is useful for setting non-animated property values during an animation.</p> <p>For example, here is a <a href="qml-qtquick-sequentialanimation.html">SequentialAnimation</a> that sets the image's <a href="qml-qtquick-item.html#opacity-prop">opacity</a> property to <code>.5</code>, animates the width of the image, then sets <a href="qml-qtquick-item.html#opacity-prop">opacity</a> back to <code>1</code>:</p> <pre class="qml"> <span class="type"><a href="qml-qtquick-sequentialanimation.html">SequentialAnimation</a></span> { <span class="type"><a href="qml-qtquick-propertyaction.html">PropertyAction</a></span> { <span class="name">target</span>: <span class="name">img</span>; <span class="name">property</span>: <span class="string">"opacity"</span>; <span class="name">value</span>: <span class="number">.5</span> } <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">target</span>: <span class="name">img</span>; <span class="name">property</span>: <span class="string">"width"</span>; <span class="name">to</span>: <span class="number">300</span>; <span class="name">duration</span>: <span class="number">1000</span> } <span class="type"><a href="qml-qtquick-propertyaction.html">PropertyAction</a></span> { <span class="name">target</span>: <span class="name">img</span>; <span class="name">property</span>: <span class="string">"opacity"</span>; <span class="name">value</span>: <span class="number">1</span> } } </pre> <p><a href="qml-qtquick-propertyaction.html">PropertyAction</a> is also useful for setting the exact point at which a property change should occur during a <a href="qmlexampletoggleswitch.html#transition">Transition</a>. For example, if <a href="qml-qtquick-propertychanges.html">PropertyChanges</a> was used in a <a href="qml-qtquick-state.html">State</a> to rotate an item around a particular <a href="qml-qtquick-item.html#transformOrigin-prop">transformOrigin</a>, it might be implemented like this:</p> <pre class="qml"> <span class="type"><a href="qml-qtquick-item.html">Item</a></span> { <span class="name">width</span>: <span class="number">400</span>; <span class="name">height</span>: <span class="number">400</span> <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> { <span class="name">id</span>: <span class="name">rect</span> <span class="name">width</span>: <span class="number">200</span>; <span class="name">height</span>: <span class="number">100</span> <span class="name">color</span>: <span class="string">"red"</span> <span class="name">states</span>: <span class="name">State</span> { <span class="name">name</span>: <span class="string">"rotated"</span> <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">rect</span>; <span class="name">rotation</span>: <span class="number">180</span>; <span class="name">transformOrigin</span>: <span class="name">Item</span>.<span class="name">BottomRight</span> } } <span class="name">transitions</span>: <span class="name">Transition</span> { <span class="type"><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a></span> { <span class="name">duration</span>: <span class="number">1000</span>; <span class="name">direction</span>: <span class="name">RotationAnimation</span>.<span class="name">Counterclockwise</span> } } <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> { <span class="name">anchors</span>.fill: <span class="name">parent</span> <span class="name">onClicked</span>: <span class="name">rect</span>.<span class="name">state</span> <span class="operator">=</span> <span class="string">"rotated"</span> } } } </pre> <p>However, with this code, the <code>transformOrigin</code> is not set until <i>after</i> the animation, as a <a href="qml-qtquick-state.html">State</a> is taken to define the values at the <i>end</i> of a transition. The animation would rotate at the default <code>transformOrigin</code>, then jump to <code>Item.BottomRight</code>. To fix this, insert a <a href="qml-qtquick-propertyaction.html">PropertyAction</a> before the <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> begins:</p> <pre class="qml"> <span class="name">transitions</span>: <span class="name">Transition</span> { <span class="type"><a href="qml-qtquick-sequentialanimation.html">SequentialAnimation</a></span> { <span class="type"><a href="qml-qtquick-propertyaction.html">PropertyAction</a></span> { <span class="name">target</span>: <span class="name">rect</span>; <span class="name">property</span>: <span class="string">"transformOrigin"</span> } <span class="type"><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a></span> { <span class="name">duration</span>: <span class="number">1000</span>; <span class="name">direction</span>: <span class="name">RotationAnimation</span>.<span class="name">Counterclockwise</span> } } } </pre> <p>This immediately sets the <code>transformOrigin</code> property to the value defined in the end state of the <a href="qmlexampletoggleswitch.html#transition">Transition</a> (i.e. the value defined in the <a href="qml-qtquick-propertyaction.html">PropertyAction</a> object) so that the rotation animation begins with the correct transform origin.</p> <p><b>See also </b><a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a> and Qt QML.</p> <!-- @@@PropertyAction --> <h2>Property Documentation</h2> <!-- $$$exclude --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="exclude-prop"> <td class="tblQmlPropNode"><p> <a name="exclude-prop"></a><span class="name">exclude</span> : <span class="type">list</span><<span class="type">Object</span>></p></td></tr> </table></div> </div><div class="qmldoc"><p>This property holds the objects that should not be affected by this action.</p> <p><b>See also </b><a href="qml-qtquick-propertyaction.html#targets-prop">targets</a>.</p> </div></div><!-- @@@exclude --> <br/> <!-- $$$properties --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="properties-prop"> <td class="tblQmlPropNode"><p> <a name="properties-prop"></a><span class="name">properties</span> : <span class="type">string</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>These properties determine the items and their properties that are affected by this action.</p> <p>The details of how these properties are interpreted in different situations is covered in the <a href="qml-qtquick-propertyanimation.html#properties-prop">corresponding</a> <a href="qtquick-animation-example.html#propertyanimation">PropertyAnimation</a> documentation.</p> <p><b>See also </b><a href="qml-qtquick-propertyaction.html#exclude-prop">exclude</a>.</p> </div></div><!-- @@@properties --> <br/> <!-- $$$property --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="property-prop"> <td class="tblQmlPropNode"><p> <a name="property-prop"></a><span class="name">property</span> : <span class="type">string</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>These properties determine the items and their properties that are affected by this action.</p> <p>The details of how these properties are interpreted in different situations is covered in the <a href="qml-qtquick-propertyanimation.html#properties-prop">corresponding</a> <a href="qtquick-animation-example.html#propertyanimation">PropertyAnimation</a> documentation.</p> <p><b>See also </b><a href="qml-qtquick-propertyaction.html#exclude-prop">exclude</a>.</p> </div></div><!-- @@@property --> <br/> <!-- $$$target --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="target-prop"> <td class="tblQmlPropNode"><p> <a name="target-prop"></a><span class="name">target</span> : <span class="type">Object</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>These properties determine the items and their properties that are affected by this action.</p> <p>The details of how these properties are interpreted in different situations is covered in the <a href="qml-qtquick-propertyanimation.html#properties-prop">corresponding</a> <a href="qtquick-animation-example.html#propertyanimation">PropertyAnimation</a> documentation.</p> <p><b>See also </b><a href="qml-qtquick-propertyaction.html#exclude-prop">exclude</a>.</p> </div></div><!-- @@@target --> <br/> <!-- $$$targets --> <div class="qmlitem"><div class="qmlproto"> <div class="table"><table class="qmlname"> <tr valign="top" class="odd" id="targets-prop"> <td class="tblQmlPropNode"><p> <a name="targets-prop"></a><span class="name">targets</span> : <span class="type">list</span><<span class="type">Object</span>></p></td></tr> </table></div> </div><div class="qmldoc"><p>These properties determine the items and their properties that are affected by this action.</p> <p>The details of how these properties are interpreted in different situations is covered in the <a href="qml-qtquick-propertyanimation.html#properties-prop">corresponding</a> <a href="qtquick-animation-example.html#propertyanimation">PropertyAnimation</a> documentation.</p> <p><b>See also </b><a href="qml-qtquick-propertyaction.html#exclude-prop">exclude</a>.</p> </div></div><!-- @@@targets --> <br/> <!-- $$$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">any</span></p></td></tr> </table></div> </div><div class="qmldoc"><p>This property holds the value to be set on the property.</p> <p>If the <a href="qml-qtquick-propertyaction.html">PropertyAction</a> is defined within a <a href="qmlexampletoggleswitch.html#transition">Transition</a> or <a href="qml-qtquick-behavior.html">Behavior</a>, this value defaults to the value defined in the end state of the <a href="qmlexampletoggleswitch.html#transition">Transition</a>, or the value of the property change that triggered the <a href="qml-qtquick-behavior.html">Behavior</a>.</p> </div></div><!-- @@@value --> <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>