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diff --git a/src/quicktemplates/qquickroundbutton.cpp b/src/quicktemplates/qquickroundbutton.cpp
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+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qquickroundbutton_p.h"
+
+#include <QtQuickTemplates2/private/qquickbutton_p_p.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \qmltype RoundButton
+    \inherits Button
+//!     \instantiates QQuickRoundButton
+    \inqmlmodule QtQuick.Controls
+    \since 5.8
+    \ingroup qtquickcontrols-buttons
+    \brief A push-button control with rounded corners that can be clicked by the user.
+
+    \image qtquickcontrols-roundbutton.png
+
+    RoundButton is identical to \l Button, except that it has a \l radius property
+    which allows the corners to be rounded without having to customize the
+    \l background.
+
+    \snippet qtquickcontrols-roundbutton.qml 1
+
+    \sa {Customizing RoundButton}, {Button Controls}
+*/
+
+class QQuickRoundButtonPrivate : public QQuickButtonPrivate
+{
+    Q_DECLARE_PUBLIC(QQuickRoundButton)
+
+public:
+    void setRadius(qreal newRadius = -1.0);
+
+    qreal radius = 0;
+    bool explicitRadius = false;
+};
+
+void QQuickRoundButtonPrivate::setRadius(qreal newRadius)
+{
+    Q_Q(QQuickRoundButton);
+    const qreal oldRadius = radius;
+    if (newRadius < 0)
+        radius = qMax<qreal>(0, qMin<qreal>(width, height) / 2);
+    else
+        radius = newRadius;
+
+    if (!qFuzzyCompare(radius, oldRadius))
+        emit q->radiusChanged();
+}
+
+QQuickRoundButton::QQuickRoundButton(QQuickItem *parent)
+    : QQuickButton(*(new QQuickRoundButtonPrivate), parent)
+{
+}
+
+/*!
+    \qmlproperty real QtQuick.Controls::RoundButton::radius
+
+    This property holds the radius of the button.
+
+    To create a relatively square button that has slightly rounded corners,
+    use a small value, such as \c 3.
+
+    To create a completely circular button (the default), use a value that is
+    equal to half of the width or height of the button, and make the button's
+    width and height identical.
+
+    To reset this property back to the default value, set its value to
+    \c undefined.
+*/
+qreal QQuickRoundButton::radius() const
+{
+    Q_D(const QQuickRoundButton);
+    return d->radius;
+}
+
+void QQuickRoundButton::setRadius(qreal radius)
+{
+    Q_D(QQuickRoundButton);
+    d->explicitRadius = true;
+    d->setRadius(radius);
+}
+
+void QQuickRoundButton::resetRadius()
+{
+    Q_D(QQuickRoundButton);
+    d->explicitRadius = false;
+    d->setRadius();
+}
+
+void QQuickRoundButton::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    Q_D(QQuickRoundButton);
+    QQuickControl::geometryChange(newGeometry, oldGeometry);
+    if (!d->explicitRadius)
+        d->setRadius();
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qquickroundbutton_p.cpp"