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#include "viewmarkingscrollbar.h"
#include "modelutils.h"
#include <QStyle>
#include <QStyleOptionSlider>
#include <QPainter>
ViewMarkingScrollBar::ViewMarkingScrollBar(QAbstractItemModel* model, int role, QWidget *parent)
: 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);
auto indices = flatIndex(m_model, 0, QModelIndex());
painter.translate(innerRect.topLeft() + QPoint(0, 3));
qreal scale = static_cast<qreal>(innerRect.height() - 3) / static_cast<qreal>(indices.size());
for (int i = 0; i < indices.size(); ++i) {
QVariant data = indices[i].data(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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