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<td >Qt 5.7</td><td ><a href="qtquickcontrols2-index.html">Qt Quick Controls 2</a></td><td ><a href="qtquick-controls2-qmlmodule.html">QML Types</a></td><td >CheckBox QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.7.1 Reference Documentation</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">CheckBox QML Type</h1>
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<p>An option button that can be checked or unchecked. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick.Controls 2.0</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.7</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtquick-controls2-abstractbutton.html">AbstractButton</a></p>
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<h2 id="properties">Properties</h2>
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<li class="fn"><b><b><a href="qml-qtquick-controls2-checkbox.html#checkState-prop">checkState</a></b></b> : enumeration</li>
<li class="fn"><b><b><a href="qml-qtquick-controls2-checkbox.html#tristate-prop">tristate</a></b></b> : bool</li>
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<h2 id="details">Detailed Description</h2>
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<p class="centerAlign"><img src="images/qtquickcontrols2-checkbox.gif" alt="" /></p><p><a href="qml-qtquick-controls2-checkbox.html">CheckBox</a> presents an option button that can be toggled on (checked) or off (unchecked). Check boxes are typically used to select one or more options from a set of options. For larger sets of options, such as those in a list, consider using <a href="qml-qtquick-controls2-checkdelegate.html">CheckDelegate</a> instead.</p>
<p><a href="qml-qtquick-controls2-checkbox.html">CheckBox</a> inherits its API from <a href="qml-qtquick-controls2-abstractbutton.html">AbstractButton</a>. For instance, the state of the checkbox can be set with the <a href="qml-qtquick-controls2-abstractbutton.html#checked-prop">checked</a> property.</p>
<p>In addition to the checked and unchecked states, there is a third state: partially checked. The partially checked state can be enabled using the <a href="qml-qtquick-controls2-checkbox.html#tristate-prop">tristate</a> property. This state indicates that the regular checked/unchecked state can not be determined; generally because of other states that affect the checkbox. This state is useful when several child nodes are selected in a treeview, for example.</p>
<pre class="cpp">
ColumnLayout {
CheckBox {
checked: <span class="keyword">true</span>
text: qsTr(<span class="string">"First"</span>)
}
CheckBox {
text: qsTr(<span class="string">"Second"</span>)
}
CheckBox {
checked: <span class="keyword">true</span>
text: qsTr(<span class="string">"Third"</span>)
}
}
</pre>
<p><b>See also </b><a href="qtquickcontrols2-customize.html#customizing-checkbox">Customizing CheckBox</a> and <a href="qtquickcontrols2-buttons.html">Button Controls</a>.</p>
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<h2>Property Documentation</h2>
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<a name="checkState-prop"></a><span class="name">checkState</span> : <span class="type">enumeration</span></p></td></tr>
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</div><div class="qmldoc"><p>This property holds the check state of the checkbox.</p>
<p>Available states:</p>
<div class="table"><table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><code>Qt.Unchecked</code></td><td class="topAlign">The checkbox is unchecked.</td></tr>
<tr><td class="topAlign"><code>Qt.PartiallyChecked</code></td><td class="topAlign">The checkbox is partially checked. This state is only used when <a href="qml-qtquick-controls2-checkbox.html#tristate-prop">tristate</a> is enabled.</td></tr>
<tr><td class="topAlign"><code>Qt.Checked</code></td><td class="topAlign">The checkbox is checked.</td></tr>
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<p><b>See also </b><a href="qml-qtquick-controls2-checkbox.html#tristate-prop">tristate</a> and <a href="qml-qtquick-controls2-abstractbutton.html#checked-prop">checked</a>.</p>
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<a name="tristate-prop"></a><span class="name">tristate</span> : <span class="type">bool</span></p></td></tr>
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</div><div class="qmldoc"><p>This property holds whether the checkbox is a tri-state checkbox.</p>
<p>In the animation below, the first checkbox is tri-state:</p>
<p class="centerAlign"><img src="images/qtquickcontrols2-checkbox-tristate.gif" alt="" /></p><p>The default is <code>false</code>, i.e., the checkbox has only two states.</p>
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