1 files changed, 134 insertions, 0 deletions
diff --git a/src/quicknativestyle/items/qquickstyleitemscrollbar.cpp b/src/quicknativestyle/items/qquickstyleitemscrollbar.cpp
new file mode 100644
index 0000000000..097341eb56
--- /dev/null
+++ b/src/quicknativestyle/items/qquickstyleitemscrollbar.cpp
@@ -0,0 +1,134 @@
+// 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 "qquickstyleitemscrollbar.h"
+
+QT_BEGIN_NAMESPACE
+
+QQuickStyleItemScrollBar::QQuickStyleItemScrollBar(QQuickItem *parent)
+    : QQuickStyleItem(parent)
+{
+#ifdef QT_DEBUG
+    setObjectName("styleItemScrollBar");
+#endif
+}
+
+QFont QQuickStyleItemScrollBar::styleFont(QQuickItem *control) const
+{
+    return style()->font(QStyle::CE_ProgressBarLabel, controlSize(control));
+}
+
+void QQuickStyleItemScrollBar::connectToControl() const
+{
+    QQuickStyleItem::connectToControl();
+    auto scrollBar = control<QQuickScrollBar>();
+    connect(scrollBar, &QQuickScrollBar::orientationChanged, this, &QQuickStyleItem::markImageDirty);
+    connect(scrollBar, &QQuickScrollBar::pressedChanged, this, &QQuickStyleItem::markImageDirty);
+}
+
+StyleItemGeometry QQuickStyleItemScrollBar::calculateGeometry()
+{
+    QStyleOptionSlider styleOption;
+    initStyleOption(styleOption);
+
+    StyleItemGeometry geometry;
+    geometry.minimumSize = style()->sizeFromContents(QStyle::CT_ScrollBar, &styleOption, QSize(0, 0));
+    if (m_subControl == SubLine || m_subControl == AddLine) {
+        // So far, we know that only the windows style uses these subcontrols,
+        // so we can use hardcoded sizes...
+        QSize sz(16, 17);
+        if (styleOption.orientation == Qt::Vertical)
+            sz.transpose();
+        geometry.minimumSize = sz;
+    }
+    geometry.implicitSize = geometry.minimumSize;
+    styleOption.rect = QRect(QPoint(0, 0), geometry.implicitSize);
+    geometry.layoutRect = style()->subElementRect(QStyle::SE_ScrollBarLayoutItem, &styleOption);
+    geometry.ninePatchMargins = style()->ninePatchMargins(QStyle::CC_ScrollBar, &styleOption, geometry.minimumSize);
+
+    return geometry;
+}
+
+void QQuickStyleItemScrollBar::paintEvent(QPainter *painter) const
+{
+    QStyleOptionSlider styleOption;
+    initStyleOption(styleOption);
+    if (m_subControl == SubLine || m_subControl == AddLine) {
+        QStyle::SubControl sc = m_subControl == SubLine ? QStyle::SC_ScrollBarSubLine : QStyle::SC_ScrollBarAddLine;
+        QStyleOptionSlider opt = styleOption;
+        opt.subControls = QStyle::SC_ScrollBarAddLine
+                        | QStyle::SC_ScrollBarSubLine
+                        | QStyle::SC_ScrollBarGroove;
+
+        const qreal scale = window()->effectiveDevicePixelRatio();
+        const QSize scrollBarMinSize = style()->sizeFromContents(QStyle::CT_ScrollBar, &opt, QSize(0, 0));
+        const QSize sz = scrollBarMinSize * scale;
+        QImage scrollBarImage(sz, QImage::Format_ARGB32_Premultiplied);
+        scrollBarImage.setDevicePixelRatio(scale);
+        QPainter p(&scrollBarImage);
+        opt.rect = QRect(QPoint(0, 0), scrollBarMinSize);
+        style()->drawComplexControl(QStyle::CC_ScrollBar, &opt, &p);
+        QRect sourceImageRect = style()->subControlRect(QStyle::CC_ScrollBar, &opt, sc);
+        sourceImageRect = QRect(sourceImageRect.topLeft() * scale, sourceImageRect.size() * scale);
+        painter->drawImage(QPoint(0, 0), scrollBarImage, sourceImageRect);
+    } else {
+        style()->drawComplexControl(QStyle::CC_ScrollBar, &styleOption, painter);
+    }
+}
+
+void QQuickStyleItemScrollBar::initStyleOption(QStyleOptionSlider &styleOption) const
+{
+    initStyleOptionBase(styleOption);
+    auto scrollBar = control<QQuickScrollBar>();
+
+    switch (m_subControl) {
+    case Groove:
+        styleOption.subControls = QStyle::SC_ScrollBarGroove | QStyle::SC_ScrollBarAddLine | QStyle::SC_ScrollBarSubLine;
+        break;
+    case Handle:
+        styleOption.subControls = QStyle::SC_ScrollBarSlider;
+        break;
+    case AddLine:
+        styleOption.subControls = QStyle::SC_ScrollBarAddLine;
+        break;
+    case SubLine:
+        styleOption.subControls = QStyle::SC_ScrollBarSubLine;
+        break;
+    }
+
+    styleOption.activeSubControls = QStyle::SC_None;
+    styleOption.orientation = scrollBar->orientation();
+    if (styleOption.orientation == Qt::Horizontal)
+        styleOption.state |= QStyle::State_Horizontal;
+
+    if (scrollBar->isPressed())
+        styleOption.state |= QStyle::State_Sunken;
+
+    if (m_overrideState != None) {
+        // In ScrollBar.qml we fade between two versions of
+        // the handle, depending on if it's hovered or not
+
+        if (m_overrideState == AlwaysHovered) {
+            styleOption.state &= ~QStyle::State_Sunken;
+            styleOption.activeSubControls = (styleOption.subControls & (QStyle::SC_ScrollBarSlider | QStyle::SC_ScrollBarGroove | QStyle::SC_ScrollBarAddLine | QStyle::SC_ScrollBarSubLine));
+        } else if (m_overrideState == NeverHovered) {
+            styleOption.state &= ~QStyle::State_Sunken;
+            styleOption.activeSubControls &= ~(styleOption.subControls & (QStyle::SC_ScrollBarSlider | QStyle::SC_ScrollBarGroove | QStyle::SC_ScrollBarAddLine | QStyle::SC_ScrollBarSubLine));
+        } else if (m_overrideState  == AlwaysSunken) {
+            styleOption.state |= QStyle::State_Sunken;
+            styleOption.activeSubControls = (styleOption.subControls & (QStyle::SC_ScrollBarSlider | QStyle::SC_ScrollBarGroove | QStyle::SC_ScrollBarAddLine | QStyle::SC_ScrollBarSubLine));
+        }
+    }
+
+    // The following values will let the handle fill 100% of the
+    // groove / imageSize. But when the handle is resized by
+    // QQuickScrollBar, it will end up with the correct size visually.
+    styleOption.pageStep = 1000;
+    styleOption.minimum = 0;
+    styleOption.maximum = 1;
+    styleOption.sliderValue = 0;
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qquickstyleitemscrollbar.cpp"