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// Copyright (C) 2020 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 "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) const
{
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()->effectiveDevicePixelRatio();
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) const
{
initStyleOptionBase(styleOption);
styleOption.subControls = QStyle::SC_ScrollBarGroove;
styleOption.activeSubControls = QStyle::SC_None;
styleOption.pageStep = 1000;
styleOption.minimum = 0;
styleOption.maximum = 1;
styleOption.sliderValue = 0;
}
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