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+/****************************************************************************
+**
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickstyleitemscrollviewcorner.h"
+
+StyleItemGeometry QQuickStyleItemScrollViewCorner::calculateGeometry()
+{
+ QStyleOptionSlider styleOption;
+ initStyleOption(styleOption);
+
+ StyleItemGeometry geometry;
+
+ // The size of the corner should be the width of the vertical
+ // scrollbar and the height of the horizontal scrollbar.
+ styleOption.orientation = Qt::Vertical;
+ const auto vScrollBarWidth = style()->sizeFromContents(QStyle::CT_ScrollBar, &styleOption, QSize(0, 0)).width();
+ styleOption.orientation = Qt::Horizontal;
+ const auto hScrollBarHeight = style()->sizeFromContents(QStyle::CT_ScrollBar, &styleOption, QSize(0, 0)).height();
+
+ geometry.minimumSize = QSize(vScrollBarWidth, hScrollBarHeight);
+ geometry.implicitSize = geometry.minimumSize;
+
+ return geometry;
+}
+
+void QQuickStyleItemScrollViewCorner::paintEvent(QPainter *painter)
+{
+ QStyleOptionSlider styleOption;
+ initStyleOption(styleOption);
+
+ // Grab a center piece of a vertical scrollbar groove onto a QImage, and use this
+ // image to draw a corner. We draw the corner by first drawing the piece as it is, and
+ // then rotate it 90 degrees, clip it into a triangle, and draw it once more on top.
+ // The result is that we end up with one vertical and one horizontal triangle that
+ // together form a filled corner rectangle.
+
+ styleOption.orientation = Qt::Vertical;
+
+ const qreal scale = window()->devicePixelRatio();
+ const int grooveWidth = minimumSize().width();
+ const int grooveHeight = minimumSize().height();
+ const QSize scrollBarMinSize = style()->sizeFromContents(QStyle::CT_ScrollBar, &styleOption, QSize(0, 0));
+ const QSize scrollBarSize = scrollBarMinSize + QSize(0, grooveHeight);
+ const int hStart = scrollBarMinSize.height() / 2;
+ const QRect targetImageRect(0, hStart * scale, grooveWidth * scale, grooveHeight * scale);
+
+ QImage scrollBarImage(scrollBarSize * scale, QImage::Format_ARGB32_Premultiplied);
+ scrollBarImage.setDevicePixelRatio(scale);
+ scrollBarImage.fill(Qt::transparent);
+ QPainter scrollBarPainter(&scrollBarImage);
+ styleOption.rect = QRect(QPoint(0, 0), scrollBarSize);
+ style()->drawComplexControl(QStyle::CC_ScrollBar, &styleOption, &scrollBarPainter);
+
+ // Draw vertical groove
+ painter->drawImage(QPoint(0, 0), scrollBarImage, targetImageRect);
+
+ QPainterPath path;
+ path.moveTo(0, 0);
+ path.lineTo(0, grooveHeight);
+ path.lineTo(grooveWidth, grooveHeight);
+ path.closeSubpath();
+
+ QTransform transform;
+ transform.translate(grooveWidth, 0);
+ transform.rotate(90);
+
+ painter->save();
+ painter->setCompositionMode(QPainter::CompositionMode_Source);
+ painter->setClipPath(path);
+ painter->setTransform(transform);
+ // Draw horizontal groove, clipped to a triangle
+ painter->drawImage(QPoint(0, 0), scrollBarImage, targetImageRect);
+ painter->restore();
+}
+
+void QQuickStyleItemScrollViewCorner::initStyleOption(QStyleOptionSlider &styleOption)
+{
+ initStyleOptionBase(styleOption);
+
+ styleOption.subControls = QStyle::SC_ScrollBarGroove;
+ styleOption.activeSubControls = QStyle::SC_None;
+ styleOption.pageStep = 1000;
+ styleOption.minimum = 0;
+ styleOption.maximum = 1;
+ styleOption.sliderValue = 0;
+}