qquickheaderview.cpp

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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
// Qt-Security score:significant reason:default
 
#include <QtQuickTemplates2/private/qquickheaderview_p_p.h>
#include <algorithm>
 
/*!
    \qmltype HorizontalHeaderView
    \inqmlmodule QtQuick.Controls
    \ingroup qtquickcontrols-containers
    \inherits TableView
    \brief Provides a horizontal header view to accompany a \l TableView.
 
    \include qquickheaderview.qdocinc {detailed-description} {HorizontalHeaderView}
 
    \sa VerticalHeaderView
*/
 
/*!
    \qmltype VerticalHeaderView
    \inqmlmodule QtQuick.Controls
    \ingroup qtquickcontrols-containers
    \inherits TableView
    \brief Offers a vertical header view to accompany a \l TableView.
 
    \include qquickheaderview.qdocinc {detailed-description} {VerticalHeaderView}
 
    \sa HorizontalHeaderView
*/
 
/*!
    \qmlproperty TableView QtQuick.Controls::HorizontalHeaderView::syncView
 
    \include qquickheaderview.qdocinc {syncView} {horizontally}
*/
 
/*!
    \qmlproperty TableView QtQuick.Controls::VerticalHeaderView::syncView
 
    \include qquickheaderview.qdocinc {syncView} {vertically}
*/
 
/*!
    \qmlproperty QVariant QtQuick.Controls::HorizontalHeaderView::model
 
    \include qquickheaderview.qdocinc {model} {horizontal}
*/
 
/*!
    \qmlproperty QVariant QtQuick.Controls::VerticalHeaderView::model
 
    \include qquickheaderview.qdocinc {model} {vertical}
*/
 
/*!
    \qmlproperty string QtQuick.Controls::HorizontalHeaderView::textRole
 
    \include qquickheaderview.qdocinc {textRole}
*/
 
/*!
    \qmlproperty string QtQuick.Controls::VerticalHeaderView::textRole
 
    \include qquickheaderview.qdocinc {textRole}
*/
 
/*!
    \qmlproperty bool QtQuick.Controls::HorizontalHeaderView::movableColumns
    \since 6.8
 
    \include qquickheaderview.qdocinc {movableColumns}
*/
 
/*!
    \qmlproperty bool QtQuick.Controls::VerticalHeaderView::movableRows
    \since 6.8
 
    \include qquickheaderview.qdocinc {movableRows}
*/
 
QT_BEGIN_NAMESPACE
 
static const char *kRequiredProperty_headerView = "headerView";
static const char *kRequiredProperty_model = "model";
 
QQuickHeaderViewBasePrivate::QQuickHeaderViewBasePrivate()
    : QQuickTableViewPrivate()
{
}
 
QQuickHeaderViewBasePrivate::~QQuickHeaderViewBasePrivate()
{
}
 
void QQuickHeaderViewBasePrivate::init()
{
    Q_Q(QQuickHeaderViewBase);
    m_headerDataProxyModel.m_headerView = q;
    setSizePolicy(orientation() == Qt::Horizontal ? QLayoutPolicy::Preferred : QLayoutPolicy::Fixed,
                  orientation() == Qt::Horizontal ? QLayoutPolicy::Fixed : QLayoutPolicy::Preferred);
    q->setSyncDirection(orientation());
}
 
const QPointer<QQuickItem> QQuickHeaderViewBasePrivate::delegateItemAt(int row, int col) const
{
    return loadedTableItem(QPoint(col, row))->item;
}
 
QVariant QQuickHeaderViewBasePrivate::modelImpl() const
{
    // modelImpl is supposed to return the actual model that is
    // is used (that is, the proxy model), and not the source model.
    if (m_headerDataProxyModel.sourceModel())
        return QVariant::fromValue(&m_headerDataProxyModel);
 
    // If we're not using the proxy model, use the assigned model
    return QQuickTableViewPrivate::modelImpl();
}
 
void QQuickHeaderViewBasePrivate::setModelImpl(const QVariant &newModel)
{
    m_modelExplicitlySet = newModel.isValid();
 
    auto asTableModel = [](QAbstractItemModel *model) -> QAbstractItemModel* {
        if (qobject_cast<QAbstractTableModel *>(model))
            return model;
 
        // Since QQmlTableModel is not derived from QAbstractTableModel (QATM),
        // we have to check for this model separately. We want it to behave like
        // QATM to keep existing code working. This model is in the Labs module,
        // and we cannot link to it to make a qobject_cast. Therefore, we are checking
        // the class name.
        // TODO: When QQmlTableModel leaves Labs, change to qobject_cast?
        if (model && QByteArrayView(model->metaObject()->className()) == "QQmlTableModel")
            return model;
        return nullptr;
    };
 
    if (auto qabstracttablemodel = asTableModel(qaim(newModel))) {
        if (qabstracttablemodel != m_headerDataProxyModel.sourceModel()) {
            m_headerDataProxyModel.setSourceModel(qabstracttablemodel);
            assignedModel = QVariant::fromValue(std::addressof(m_headerDataProxyModel));
            scheduleRebuildTable(QQuickTableViewPrivate::RebuildOption::All);
            emit q_func()->modelChanged();
        }
        return;
    }
 
    m_headerDataProxyModel.setSourceModel(nullptr);
    QQuickTableViewPrivate::setModelImpl(newModel);
}
 
void QQuickHeaderViewBasePrivate::syncModel()
{
    if (!m_modelExplicitlySet && assignedSyncView) {
        // When no model has been explicitly set, but we have a syncView, we
        // should use the headerData() from the syncView's model as model.
        // If the model is not a QAbstractItemModel, or if it doesn't contain
        // any header data, header view will be empty.
        auto syncView_d = QQuickTableViewPrivate::get(assignedSyncView);
        auto syncViewModelAsQaim = qaim(syncView_d->assignedModel);
        if (syncViewModelAsQaim != m_headerDataProxyModel.sourceModel()) {
            m_headerDataProxyModel.setSourceModel(syncViewModelAsQaim); // can be nullptr
            assignedModel = QVariant::fromValue(std::addressof(m_headerDataProxyModel));
            emit q_func()->modelChanged();
        }
    }
 
    QQuickTableViewPrivate::syncModel();
 
    // For models that are just a list or a number, and especially not a
    // table, we transpose the view when the orientation is horizontal.
    // The model (list) will then be laid out horizontally rather than
    // vertically, which is otherwise the default.
    isTransposed = false;
    const auto aim = model->abstractItemModel();
    if (orientation() == Qt::Horizontal)
        isTransposed = !aim || aim->columnCount() == 1;
 
    if (m_textRole.isEmpty() && aim)
        m_textRole = QLatin1String("display");
}
 
void QQuickHeaderViewBasePrivate::syncSyncView()
{
    if (assignedSyncDirection != orientation()) {
        qmlWarning(q_func()) << "Setting syncDirection other than Qt::"
                             << QVariant::fromValue(orientation()).toString()
                             << " is invalid.";
        assignedSyncDirection = orientation();
    }
    QQuickTableViewPrivate::syncSyncView();
}
 
QAbstractItemModel *QQuickHeaderViewBasePrivate::selectionSourceModel()
{
    // Our proxy model shares no common model items with HeaderView.model. So
    // selections done in HeaderView cannot be represented in an ItemSelectionModel
    // that is shared with the syncView (and for the same reason, the mapping functions
    // modelIndex(cell) and cellAtIndex(index) have not been overridden either).
    // Instead, we set the internal proxy model as selection source model.
    return &m_headerDataProxyModel;
}
 
void QQuickHeaderViewBasePrivate::initItemCallback(int modelIndex, QObject *object)
{
    Q_Q(QQuickHeaderViewBase);
 
    QQuickTableViewPrivate::initItemCallback(modelIndex, object);
 
    auto item = qobject_cast<QQuickItem *>(object);
    if (!item)
        return;
 
    QQmlDelegateModelItem *modelItem = tableModel->getModelItem(modelIndex);
 
    setRequiredProperty(kRequiredProperty_headerView, QVariant::fromValue(q),
                        modelIndex, item, true);
    setRequiredProperty(kRequiredProperty_model, QVariant::fromValue(modelItem->modelObject()),
                        modelIndex, item, true);
}
 
int QQuickHeaderViewBasePrivate::logicalRowIndex(const int visualIndex) const
{
    return (m_headerDataProxyModel.orientation() == Qt::Horizontal) ? visualIndex : QQuickTableViewPrivate::logicalRowIndex(visualIndex);
}
 
int QQuickHeaderViewBasePrivate::logicalColumnIndex(const int visualIndex) const
{
    return (m_headerDataProxyModel.orientation() == Qt::Vertical) ? visualIndex : QQuickTableViewPrivate::logicalColumnIndex(visualIndex);
}
 
int QQuickHeaderViewBasePrivate::visualRowIndex(const int logicalIndex) const
{
    return (m_headerDataProxyModel.orientation() == Qt::Horizontal) ? logicalIndex : QQuickTableViewPrivate::visualRowIndex(logicalIndex);
}
 
int QQuickHeaderViewBasePrivate::visualColumnIndex(const int logicalIndex) const
{
    return (m_headerDataProxyModel.orientation() == Qt::Vertical) ? logicalIndex : QQuickTableViewPrivate::visualColumnIndex(logicalIndex);
}
 
QQuickHeaderViewBase::QQuickHeaderViewBase(Qt::Orientation orient, QQuickItem *parent)
    : QQuickTableView(*(new QQuickHeaderViewBasePrivate), parent)
{
    Q_D(QQuickHeaderViewBase);
    d->setOrientation(orient);
    d->init();
}
 
QQuickHeaderViewBase::QQuickHeaderViewBase(QQuickHeaderViewBasePrivate &dd, QQuickItem *parent)
    : QQuickTableView(dd, parent)
{
    Q_D(QQuickHeaderViewBase);
    d->init();
}
 
QQuickHeaderViewBase::~QQuickHeaderViewBase()
{
}
 
QString QQuickHeaderViewBase::textRole() const
{
    Q_D(const QQuickHeaderViewBase);
    return d->m_textRole;
}
 
void QQuickHeaderViewBase::setTextRole(const QString &role)
{
    Q_D(QQuickHeaderViewBase);
    if (d->m_textRole == role)
        return;
 
    d->m_textRole = role;
    emit textRoleChanged();
}
 
Qt::Orientation QQuickHeaderViewBasePrivate::orientation() const
{
    return m_headerDataProxyModel.orientation();
}
 
void QQuickHeaderViewBasePrivate::setOrientation(Qt::Orientation orientation)
{
    if (QQuickHeaderViewBasePrivate::orientation() == orientation)
        return;
    m_headerDataProxyModel.setOrientation(orientation);
}
 
QQuickVerticalHeaderView::QQuickVerticalHeaderView(QQuickVerticalHeaderViewPrivate &dd, QQuickItem *parent)
    : QQuickHeaderViewBase(dd, parent)
{
}
 
/*! \internal
    \class QHeaderDataProxyModel
    \brief
    QHeaderDataProxyModel is a proxy AbstractItemModel type that maps
    source model's headerData() to correspondent data()
 */
QHeaderDataProxyModel::QHeaderDataProxyModel(QObject *parent)
    : QAbstractItemModel(parent)
{
}
 
QHeaderDataProxyModel::~QHeaderDataProxyModel() = default;
 
void QHeaderDataProxyModel::setSourceModel(QAbstractItemModel *newSourceModel)
{
    if (m_model == newSourceModel)
        return;
    beginResetModel();
    disconnectFromModel();
    m_model = newSourceModel;
    connectToModel();
    endResetModel();
}
 
QModelIndex QHeaderDataProxyModel::index(int row, int column, const QModelIndex &parent) const
{
    return hasIndex(row, column, parent) ? createIndex(row, column) : QModelIndex();
}
 
QModelIndex QHeaderDataProxyModel::parent(const QModelIndex &child) const
{
    Q_UNUSED(child);
    return QModelIndex();
}
 
QModelIndex QHeaderDataProxyModel::sibling(int row, int column, const QModelIndex &) const
{
    return index(row, column);
}
 
int QHeaderDataProxyModel::rowCount(const QModelIndex &parent) const
{
    if (parent.isValid())
        return 0;
    return m_model.isNull() ? -1 : (m_orientation == Qt::Horizontal ? 1 : m_model->rowCount(parent));
}
 
int QHeaderDataProxyModel::columnCount(const QModelIndex &parent) const
{
    if (parent.isValid())
        return 0;
    return m_model.isNull() ? -1 : (m_orientation == Qt::Vertical ? 1 : m_model->columnCount(parent));
}
 
QVariant QHeaderDataProxyModel::data(const QModelIndex &index, int role) const
{
    if (m_model.isNull() || !hasIndex(index.row(), index.column()))
        return QVariant();
    auto section = m_orientation == Qt::Vertical ? index.row() : index.column();
    return m_model->headerData(section, m_orientation, role);
}
 
bool QHeaderDataProxyModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (!hasIndex(index.row(), index.column()))
        return false;
    auto section = m_orientation == Qt::Vertical ? index.row() : index.column();
    auto ret = m_model->setHeaderData(section, m_orientation, value, role);
    return ret;
}
 
bool QHeaderDataProxyModel::hasChildren(const QModelIndex &parent) const
{
    if (!parent.isValid())
        return rowCount(parent) > 0 && columnCount(parent) > 0;
    return false;
}
 
QHash<int, QByteArray> QHeaderDataProxyModel::roleNames() const
{
    using namespace Qt::Literals::StringLiterals;
 
    auto names = m_model ? m_model->roleNames() : QAbstractItemModel::roleNames();
    if (m_headerView) {
        QString textRole = m_headerView->textRole();
        if (textRole.isEmpty())
            textRole = u"display"_s;
        if (!names.values().contains(textRole.toUtf8().constData())) {
            qmlWarning(m_headerView).nospace() << "The 'textRole' property contains a role that doesn't exist in the model: "
                                               << textRole << ". Check your model's roleNames() implementation";
        }
    }
 
    return names;
}
 
QVariant QHeaderDataProxyModel::variantValue() const
{
    return QVariant::fromValue(static_cast<QObject *>(const_cast<QHeaderDataProxyModel *>(this)));
}
 
void QHeaderDataProxyModel::setOrientation(Qt::Orientation o)
{
    if (o == m_orientation)
        return;
    beginResetModel();
    m_orientation = o;
    endResetModel();
}
 
Qt::Orientation QHeaderDataProxyModel::orientation() const
{
    return m_orientation;
}
 
QPointer<QAbstractItemModel> QHeaderDataProxyModel::sourceModel() const
{
    return m_model;
}
 
void QHeaderDataProxyModel::connectToModel()
{
    if (m_model.isNull())
        return;
    connect(m_model, &QAbstractItemModel::headerDataChanged,
        this, [this](Qt::Orientation orient, int first, int last) {
            if (orient != orientation())
                return;
            if (orient == Qt::Horizontal) {
                emit dataChanged(createIndex(0, first), createIndex(0, last));
            } else {
                emit dataChanged(createIndex(first, 0), createIndex(last, 0));
            }
        });
    connect(m_model, &QAbstractItemModel::modelAboutToBeReset,
        this, &QHeaderDataProxyModel::modelAboutToBeReset, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::modelReset,
        this, &QHeaderDataProxyModel::modelReset, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::rowsAboutToBeMoved,
        this, &QHeaderDataProxyModel::rowsAboutToBeMoved, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::rowsMoved,
        this, &QHeaderDataProxyModel::rowsMoved, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::rowsAboutToBeInserted,
        this, &QHeaderDataProxyModel::rowsAboutToBeInserted, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::rowsInserted,
        this, &QHeaderDataProxyModel::rowsInserted, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::rowsAboutToBeRemoved,
        this, &QHeaderDataProxyModel::rowsAboutToBeRemoved, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::rowsRemoved,
        this, &QHeaderDataProxyModel::rowsRemoved, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::columnsAboutToBeMoved,
        this, &QHeaderDataProxyModel::columnsAboutToBeMoved, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::columnsMoved,
        this, &QHeaderDataProxyModel::columnsMoved, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::columnsAboutToBeInserted,
        this, &QHeaderDataProxyModel::columnsAboutToBeInserted, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::columnsInserted,
        this, &QHeaderDataProxyModel::columnsInserted, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::columnsAboutToBeRemoved,
        this, &QHeaderDataProxyModel::columnsAboutToBeRemoved, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::columnsRemoved,
        this, &QHeaderDataProxyModel::columnsRemoved, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::layoutAboutToBeChanged,
        this, &QHeaderDataProxyModel::layoutAboutToBeChanged, Qt::UniqueConnection);
    connect(m_model, &QAbstractItemModel::layoutChanged,
        this, &QHeaderDataProxyModel::layoutChanged, Qt::UniqueConnection);
}
 
void QHeaderDataProxyModel::disconnectFromModel()
{
    if (m_model.isNull())
        return;
    m_model->disconnect(this);
}
 
QQuickHorizontalHeaderView::QQuickHorizontalHeaderView(QQuickItem *parent)
    : QQuickHeaderViewBase(*(new QQuickHorizontalHeaderViewPrivate), parent)
{
    setFlickableDirection(FlickableDirection::HorizontalFlick);
    setResizableColumns(true);
}
 
QQuickHorizontalHeaderView::~QQuickHorizontalHeaderView()
{
#if QT_CONFIG(quick_draganddrop)
    Q_D(QQuickHorizontalHeaderView);
    d->destroySectionDragHandler();
#endif
}
 
bool QQuickHorizontalHeaderView::movableColumns() const
{
    Q_D(const QQuickHorizontalHeaderView);
    return d->m_movableColumns;
}
 
void QQuickHorizontalHeaderView::setMovableColumns(bool movableColumns)
{
    Q_D(QQuickHorizontalHeaderView);
    if (d->m_movableColumns == movableColumns)
        return;
 
    d->m_movableColumns = movableColumns;
 
#if QT_CONFIG(quick_draganddrop)
    if (d->m_movableColumns)
        d->initSectionDragHandler(Qt::Horizontal);
    else
        d->destroySectionDragHandler();
#endif
 
    emit movableColumnsChanged();
}
 
QQuickVerticalHeaderView::QQuickVerticalHeaderView(QQuickItem *parent)
    : QQuickHeaderViewBase(*(new QQuickVerticalHeaderViewPrivate), parent)
{
    setFlickableDirection(FlickableDirection::VerticalFlick);
    setResizableRows(true);
}
 
QQuickVerticalHeaderView::~QQuickVerticalHeaderView()
{
#if QT_CONFIG(quick_draganddrop)
    Q_D(QQuickVerticalHeaderView);
    d->destroySectionDragHandler();
#endif
}
 
bool QQuickVerticalHeaderView::movableRows() const
{
    Q_D(const QQuickVerticalHeaderView);
    return d->m_movableRows ;
}
 
void QQuickVerticalHeaderView::setMovableRows(bool movableRows)
{
    Q_D(QQuickVerticalHeaderView);
    if (d->m_movableRows == movableRows)
        return;
 
    d->m_movableRows = movableRows;
 
#if QT_CONFIG(quick_draganddrop)
    if (d->m_movableRows)
        d->initSectionDragHandler(Qt::Vertical);
    else
        d->destroySectionDragHandler();
#endif
 
    emit movableRowsChanged();
}
 
QQuickHorizontalHeaderViewPrivate::QQuickHorizontalHeaderViewPrivate()
{
    setOrientation(Qt::Horizontal);
};
 
QQuickHorizontalHeaderViewPrivate::~QQuickHorizontalHeaderViewPrivate() = default;
 
QQuickVerticalHeaderViewPrivate::QQuickVerticalHeaderViewPrivate()
{
    setOrientation(Qt::Vertical);
};
 
QQuickVerticalHeaderViewPrivate::~QQuickVerticalHeaderViewPrivate() = default;
 
QT_END_NAMESPACE
 
#include "moc_qquickheaderview_p_p.cpp"
 
#include "moc_qquickheaderview_p.cpp"