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qtdeclarative5-doc-5.12.6-1.mga7.noarch.rpm

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<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>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">PathAttribute QML Type</h1>
<span class="subtitle"></span>
<!-- $$$PathAttribute-brief -->
<p>Specifies how to set an attribute at a given position in a Path. <a href="#details">More...</a></p>
<!-- @@@PathAttribute -->
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<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick 2.12</td></tr></table></div><ul>
<li><a href="qml-qtquick-pathattribute-members.html">List of all members, including inherited members</a></li>
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<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-pathattribute.html#name-prop">name</a></b></b> : string</li>
<li class="fn"><b><b><a href="qml-qtquick-pathattribute.html#value-prop">value</a></b></b> : real</li>
</ul>
<!-- $$$PathAttribute-description -->
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<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>
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 <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>
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<p><b>See also </b><a href="qml-qtquick-path.html">Path</a>.</p>
<!-- @@@PathAttribute -->
<h2>Property Documentation</h2>
<!-- $$$name -->
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<tr valign="top" class="odd" id="name-prop">
<td class="tblQmlPropNode"><p>
<a name="name-prop"></a><span class="name">name</span> : <span class="type">string</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the name of the attribute to change.</p>
<p>This attribute will be available to the delegate as <a href="qml-qtquick-pathview.html">PathView</a>.&lt;name&gt;</p>
<p>Note that using an existing Item property name such as &quot;opacity&quot; as an attribute is allowed. This is because path attributes add a new Attached Property which in no way clashes with existing properties.</p>
</div></div><!-- @@@name -->
<br/>
<!-- $$$value -->
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<a name="value-prop"></a><span class="name">value</span> : <span class="type">real</span></p></td></tr>
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</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 -->
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