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<!-- qquickexclusivegroup.cpp -->
  <title>ExclusiveGroup QML Type | QtQuickControls 5.3</title>
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<div class="header" id="qtdocheader">
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<li>Qt 5.3</li>
<li><a href="qtquickcontrols-index.html">Qt Quick Controls</a></li>
<li><a href="qtquick-controls-qmlmodule.html">QML Types</a></li>
<li>ExclusiveGroup QML Type</li>
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Qt 5.3.2 Reference Documentation</li>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#methods">Methods</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
<li class="level2"><a href="#adding-support-to-exclusivegroup">Adding support to ExclusiveGroup</a></li>
</ul>
</div>
<h1 class="title">ExclusiveGroup QML Type</h1>
<span class="subtitle"></span>
<!-- $$$ExclusiveGroup-brief -->
<p>ExclusiveGroup provides a way to declare several checkable controls as mutually exclusive. <a href="#details">More...</a></p>
<!-- @@@ExclusiveGroup -->
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> </b><tt>import QtQuick.Controls 1.2</tt></td></tr></table><ul>
<li><a href="qml-qtquick-controls-exclusivegroup-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-controls-exclusivegroup.html#current-prop">current</a></b></b> : object</li>
</ul>
<a name="methods"></a>
<h2>Methods</h2>
<ul>
<li class="fn">void <b><b><a href="qml-qtquick-controls-exclusivegroup.html#bindCheckable-method">bindCheckable</a></b></b>(object)</li>
<li class="fn">void <b><b><a href="qml-qtquick-controls-exclusivegroup.html#unbindCheckable-method">unbindCheckable</a></b></b>(object)</li>
</ul>
<!-- $$$ExclusiveGroup-description -->
<a name="details"></a>
<h2>Detailed Description</h2>
<p>ExclusiveGroup can contain several <a href="qml-qtquick-controls-action.html">Action</a> items, and those will automatically get their <a href="qml-qtquick-controls-action.html#exclusiveGroup-prop">Action::exclusiveGroup</a> property assigned.</p>
<pre class="cpp">ExclusiveGroup {
    id: radioInputGroup

    Action {
        id: dabRadioInput
        text: <span class="string">&quot;DAB&quot;</span>
        checkable: <span class="keyword">true</span>
    }

    Action {
        id: fmRadioInput
        text: <span class="string">&quot;FM&quot;</span>
        checkable: <span class="keyword">true</span>
    }

    Action {
        id: amRadioInput
        text: <span class="string">&quot;AM&quot;</span>
        checkable: <span class="keyword">true</span>
    }
}</pre>
<p>Several controls already support ExclusiveGroup, e.g&#x2e; <a href="qml-qtquick-controls-action.html">Action</a>, <a href="qml-qtquick-controls-menuitem.html">MenuItem</a>, <a href="qml-qtquick-controls-button.html">Button</a>, and <a href="qml-qtquick-controls-radiobutton.html">RadioButton</a>.</p>
<p>As ExclusiveGroup only supports <a href="qml-qtquick-controls-action.html">Action</a> as child items, we need to manually assign the <tt>exclusiveGroup</tt> property for other objects.</p>
<pre class="cpp">GroupBox {
    id: group2
    title: qsTr(<span class="string">&quot;Tab Position&quot;</span>)
    Layout<span class="operator">.</span>fillWidth: <span class="keyword">true</span>
    RowLayout {
        ExclusiveGroup { id: tabPositionGroup }
        RadioButton {
            id: topButton
            text: qsTr(<span class="string">&quot;Top&quot;</span>)
            checked: <span class="keyword">true</span>
            exclusiveGroup: tabPositionGroup
            Layout<span class="operator">.</span>minimumWidth: <span class="number">100</span>
        }
        RadioButton {
            id: bottomButton
            text: qsTr(<span class="string">&quot;Bottom&quot;</span>)
            exclusiveGroup: tabPositionGroup
            Layout<span class="operator">.</span>minimumWidth: <span class="number">100</span>
        }
    }
}</pre>
<a name="adding-support-to-exclusivegroup"></a>
<h2>Adding support to ExclusiveGroup</h2>
<p>It is possible to add support for ExclusiveGroup for an object or control. It should have a <tt>checked</tt> property, and either a <tt>checkedChanged</tt>, <tt>toggled()</tt>, or <tt>toggled(bool)</tt> signal. It also needs to be bound with <a href="qml-qtquick-controls-exclusivegroup.html#bindCheckable-method">ExclusiveGroup::bindCheckable()</a> when its ExclusiveGroup typed property is set.</p>
<pre class="cpp">Item {
    id: myItem

    property bool checked: <span class="keyword">false</span>
    property ExclusiveGroup exclusiveGroup: null

    onExclusiveGroupChanged: {
        <span class="keyword">if</span> (exclusiveGroup)
            exclusiveGroup<span class="operator">.</span>bindCheckable(myItem)
    }
}</pre>
<p>The example above shows the minimum code necessary to add ExclusiveGroup support to any item.</p>
<!-- @@@ExclusiveGroup -->
<h2>Property Documentation</h2>
<!-- $$$current -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="current-prop"></a><span class="name">current</span> : <span class="type">object</span></p></td></tr></table></div><div class="qmldoc"><p>The currently selected object. Defaults to the first checked object bound to the <a href="qml-qtquick-controls-exclusivegroup.html">ExclusiveGroup</a>. If there is none, then it defaults to <tt>null</tt>.</p>
</div></div><!-- @@@current -->
<br/>
<h2>Method Documentation</h2>
<!-- $$$bindCheckable -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlFuncNode"><p><a name="bindCheckable-method"></a><span class="type">void</span> <span class="name">bindCheckable</span>(<span class="type">object</span>)</p></td></tr></table></div><div class="qmldoc"><p>Register <tt>object</tt> to the exclusive group.</p>
<p>You should only need to call this function when creating a component you want to be compatible with <tt>ExclusiveGroup</tt>.</p>
<p><b>See also </b><a href="qml-qtquick-controls-exclusivegroup.html#unbindCheckable-method">ExclusiveGroup::unbindCheckable()</a>.</p>
</div></div><!-- @@@bindCheckable -->
<br/>
<!-- $$$unbindCheckable -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlFuncNode"><p><a name="unbindCheckable-method"></a><span class="type">void</span> <span class="name">unbindCheckable</span>(<span class="type">object</span>)</p></td></tr></table></div><div class="qmldoc"><p>Unregister <tt>object</tt> from the exclusive group.</p>
<p>You should only need to call this function when creating a component you want to be compatible with <tt>ExclusiveGroup</tt>.</p>
<p><b>See also </b><a href="qml-qtquick-controls-exclusivegroup.html#bindCheckable-method">ExclusiveGroup::bindCheckable()</a>.</p>
</div></div><!-- @@@unbindCheckable -->
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