status-desktop/storybook/sectionsdecoratormodel.cpp

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#include "sectionsdecoratormodel.h"
#include <QScopeGuard>
SectionsDecoratorModel::SectionsDecoratorModel(QObject *parent)
: QAbstractListModel{parent}
{
}
void SectionsDecoratorModel::setSourceModel(QAbstractItemModel *sourceModel)
{
if (m_sourceModel == nullptr && sourceModel == nullptr)
return;
if (m_sourceModel != nullptr) {
qWarning("Changing source model is not supported!");
return;
}
m_sourceModel = sourceModel;
initialize();
connect(sourceModel, &QAbstractItemModel::modelReset, this, &SectionsDecoratorModel::initialize);
connect(sourceModel, &QAbstractItemModel::rowsInserted, this, &SectionsDecoratorModel::initialize);
connect(sourceModel, &QAbstractItemModel::rowsRemoved, this, &SectionsDecoratorModel::initialize);
connect(sourceModel, &QAbstractItemModel::rowsMoved, this, &SectionsDecoratorModel::initialize);
emit sourceModelChanged();
}
QAbstractItemModel* SectionsDecoratorModel::sourceModel() const
{
return m_sourceModel;
}
int SectionsDecoratorModel::rowCount(const QModelIndex &parent) const
{
return m_rowsMetadata.size();
}
QVariant SectionsDecoratorModel::data(const QModelIndex &index, int role) const
{
if (!checkIndex(index, CheckIndexOption::IndexIsValid))
return {};
const int row = index.row();
const RowMetadata &rowMetadata = m_rowsMetadata[row];
if (role == IsFoldedRole) {
return rowMetadata.folded;
} else if (role == SubitemsCountRole) {
return rowMetadata.count;
} else if (role == IsSectionRole) {
return rowMetadata.isSection;
} else if (role == m_sectionRole && rowMetadata.isSection) {
return rowMetadata.sectionName;
}
if (!rowMetadata.isSection) {
return sourceModel()->data(
sourceModel()->index(row - rowMetadata.offset, 0), role);
} else {
return QVariant();
}
}
QHash<int, QByteArray> SectionsDecoratorModel::roleNames() const
{
auto roles = m_sourceModel ? m_sourceModel->roleNames() : QHash<int, QByteArray>{};
roles.insert(IsSectionRole, QByteArrayLiteral("isSection"));
roles.insert(IsFoldedRole, QByteArrayLiteral("isFolded"));
roles.insert(SubitemsCountRole, QByteArrayLiteral("subitemsCount"));
return roles;
}
void SectionsDecoratorModel::flipFolding(int index)
{
if (index < 0 || index >= m_rowsMetadata.size())
return;
auto &row = m_rowsMetadata[index];
if (!row.isSection)
return;
row.folded = !row.folded;
const auto idx = this->index(index, 0, {});
if (row.folded) {
beginRemoveRows(QModelIndex(), index + 1, index + row.count);
m_rowsMetadata.erase(m_rowsMetadata.begin() + index + 1,
m_rowsMetadata.begin() + index + 1 + row.count);
calculateOffsets();
endRemoveRows();
} else {
beginInsertRows(QModelIndex(), index + 1, index + row.count);
m_rowsMetadata.insert(m_rowsMetadata.begin() + index + 1, row.count,
RowMetadata{false});
calculateOffsets();
endInsertRows();
}
emit dataChanged(idx, idx, { IsFoldedRole });
}
void SectionsDecoratorModel::calculateOffsets()
{
std::for_each(m_rowsMetadata.begin(), m_rowsMetadata.end(),
[offset = 0](RowMetadata &row) mutable {
if (row.isSection) {
++offset;
if (row.folded)
offset -= row.count;
} else {
row.offset = offset;
}
});
}
std::optional<int> SectionsDecoratorModel::findSectionRole() const
{
const auto roleNames = m_sourceModel->roleNames();
auto i = roleNames.constBegin();
while (i != roleNames.constEnd()) {
if (i.value() == QStringLiteral("section"))
return i.key();
++i;
}
return std::nullopt;
}
void SectionsDecoratorModel::initialize()
{
beginResetModel();
auto endResetModelGuard = qScopeGuard([this] { endResetModel(); });
m_rowsMetadata.clear();
const auto sectionRoleOpt = findSectionRole();
if (!sectionRoleOpt) {
qWarning("Section role not found!");
return;
}
m_sectionRole = *sectionRoleOpt;
QString prevSection;
int prevSectionIndex = 0;
for (int i = 0; i < m_sourceModel->rowCount(); i++) {
const QVariant sectionVariant = m_sourceModel->data(
m_sourceModel->index(i, 0), m_sectionRole);
const QString section = sectionVariant.toString();
if (prevSection != section) {
m_rowsMetadata.push_back({true, section});
prevSection = section;
prevSectionIndex = m_rowsMetadata.size() - 1;
}
m_rowsMetadata.push_back({false});
m_rowsMetadata[prevSectionIndex].count++;
}
calculateOffsets();
}