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#include "viewmarkingscrollbar.h"
#include <QPainter>
#include <QStyle>
#include <QStyleOptionSlider>
ViewMarkingScrollBar::ViewMarkingScrollBar(QAbstractItemModel* model, QWidget* parent, int role)
: QScrollBar(parent), m_Model(model), m_Role(role) {
// not implemented for horizontal sliders
Q_ASSERT(this->orientation() == Qt::Vertical);
}
void ViewMarkingScrollBar::paintEvent(QPaintEvent* event) {
if (m_Model == nullptr) {
return;
}
QScrollBar::paintEvent(event);
QStyleOptionSlider styleOption;
initStyleOption(&styleOption);
QPainter painter(this);
QRect handleRect = style()->subControlRect(QStyle::CC_ScrollBar, &styleOption, QStyle::SC_ScrollBarSlider, this);
QRect innerRect = style()->subControlRect(QStyle::CC_ScrollBar, &styleOption, QStyle::SC_ScrollBarGroove, this);
painter.translate(innerRect.topLeft() + QPoint(0, 3));
qreal scale = static_cast<qreal>(innerRect.height() - 3) / static_cast<qreal>(m_Model->rowCount());
for (int i = 0; i < m_Model->rowCount(); ++i) {
QVariant data = m_Model->data(m_Model->index(i, 0), m_Role);
if (data.isValid()) {
QColor col = data.value<QColor>();
painter.setPen(col);
painter.setBrush(col);
painter.drawRect(QRect(2, i * scale - 2, handleRect.width() - 5, 3));
}
}
}
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