NativeStyle: add focus frame to the macOS style

This patch will add a focus frame to the macOS style.
We use one focus frame item that we move around according
to changes to the focus object.

It's normally the background delegate's responsibility to
draw a focus frame, so we take care to only draw the
native focus frame for controls with default delegates.
(to be consistent with the other styles)

Change-Id: Iaa7202675c1aad2fc19682563ac1afb6e686c105
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 73 insertions, 0 deletions

diff --git a/src/imports/nativestyle/util/qquickmacfocusframe.h b/src/imports/nativestyle/util/qquickmacfocusframe.h
new file mode 100644
index 00000000..425b2a68
--- /dev/null
+++ b/src/imports/nativestyle/util/qquickmacfocusframe.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKMACFOCUSFRAME_H
+#define QQUICKMACFOCUSFRAME_H
+
+#include <QtQuick/qquickitem.h>
+#include <QtQuick/private/qquicktextedit_p.h>
+#include "qquickstyleitem.h"
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcFocusFrame)
+
+struct QQuickFocusFrameDescription {
+    QQuickItem *target;
+    QQuickStyleMargins margins;
+    const qreal radius = 3;
+    bool isValid() const { return target != nullptr; }
+    static QQuickFocusFrameDescription Invalid;
+};
+
+class QQuickMacFocusFrame : public  QObject
+{
+    Q_OBJECT
+
+public:
+    QQuickMacFocusFrame();
+
+private:
+    static QScopedPointer<QQuickItem> m_focusFrame;
+
+    void createFocusFrame(QQmlContext *context);
+    void moveToItem(QQuickItem *item);
+    QQuickFocusFrameDescription getDescriptionForItem(QQuickItem *focusItem) const;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKMACFOCUSFRAME_H