qcompleter.cpp

Go to the documentation of this file.

// Copyright (C) 2016 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 "qcompleter_p.h"
 
#include "QtWidgets/qscrollbar.h"
#include "QtCore/qdir.h"
#if QT_CONFIG(stringlistmodel)
#include "QtCore/qstringlistmodel.h"
#endif
#if QT_CONFIG(filesystemmodel)
#include "QtGui/qfilesystemmodel.h"
#endif
#include "QtWidgets/qheaderview.h"
#if QT_CONFIG(listview)
#include "QtWidgets/qlistview.h"
#endif
#include "QtWidgets/qapplication.h"
#include "QtGui/qevent.h"
#include <private/qapplication_p.h>
#include <private/qwidget_p.h>
#if QT_CONFIG(lineedit)
#include "QtWidgets/qlineedit.h"
#endif
#include "QtCore/qdir.h"
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
QCompletionModel::QCompletionModel(QCompleterPrivate *c, QObject *parent)
    : QAbstractProxyModel(*new QCompletionModelPrivate, parent),
      c(c), showAll(false)
{
    createEngine();
}
 
int QCompletionModel::columnCount(const QModelIndex &) const
{
    Q_D(const QCompletionModel);
    return d->model->columnCount();
}
 
void QCompletionModel::setSourceModel(QAbstractItemModel *source)
{
    bool hadModel = (sourceModel() != nullptr);
 
    if (hadModel)
        QObject::disconnect(sourceModel(), nullptr, this, nullptr);
 
    QAbstractProxyModel::setSourceModel(source);
 
    if (source) {
        // TODO: Optimize updates in the source model
        connect(source, SIGNAL(modelReset()), this, SLOT(invalidate()));
        connect(source, SIGNAL(destroyed()), this, SLOT(modelDestroyed()));
        connect(source, SIGNAL(layoutChanged()), this, SLOT(invalidate()));
        connect(source, SIGNAL(rowsInserted(QModelIndex,int,int)), this, SLOT(rowsInserted()));
        connect(source, SIGNAL(rowsRemoved(QModelIndex,int,int)), this, SLOT(invalidate()));
        connect(source, SIGNAL(columnsInserted(QModelIndex,int,int)), this, SLOT(invalidate()));
        connect(source, SIGNAL(columnsRemoved(QModelIndex,int,int)), this, SLOT(invalidate()));
        connect(source, SIGNAL(dataChanged(QModelIndex,QModelIndex)), this, SLOT(invalidate()));
    }
 
    invalidate();
}
 
void QCompletionModel::createEngine()
{
    bool sortedEngine = false;
    if (c->filterMode == Qt::MatchStartsWith) {
        switch (c->sorting) {
        case QCompleter::UnsortedModel:
            sortedEngine = false;
            break;
        case QCompleter::CaseSensitivelySortedModel:
            sortedEngine = c->cs == Qt::CaseSensitive;
            break;
        case QCompleter::CaseInsensitivelySortedModel:
            sortedEngine = c->cs == Qt::CaseInsensitive;
            break;
        }
    }
 
    if (sortedEngine)
        engine.reset(new QSortedModelEngine(c));
    else
        engine.reset(new QUnsortedModelEngine(c));
}
 
QModelIndex QCompletionModel::mapToSource(const QModelIndex& index) const
{
    Q_D(const QCompletionModel);
    if (!index.isValid())
        return engine->curParent;
 
    int row;
    QModelIndex parent = engine->curParent;
    if (!showAll) {
        if (!engine->matchCount())
            return QModelIndex();
        Q_ASSERT(index.row() < engine->matchCount());
        QIndexMapper& rootIndices = engine->historyMatch.indices;
        if (index.row() < rootIndices.count()) {
            row = rootIndices[index.row()];
            parent = QModelIndex();
        } else {
            row = engine->curMatch.indices[index.row() - rootIndices.count()];
        }
    } else {
        row = index.row();
    }
 
    return d->model->index(row, index.column(), parent);
}
 
QModelIndex QCompletionModel::mapFromSource(const QModelIndex& idx) const
{
    if (!idx.isValid())
        return QModelIndex();
 
    int row = -1;
    if (!showAll) {
        if (!engine->matchCount())
            return QModelIndex();
 
        QIndexMapper& rootIndices = engine->historyMatch.indices;
        if (idx.parent().isValid()) {
            if (idx.parent() != engine->curParent)
                return QModelIndex();
        } else {
            row = rootIndices.indexOf(idx.row());
            if (row == -1 && engine->curParent.isValid())
                return QModelIndex(); // source parent and our parent don't match
        }
 
        if (row == -1) {
            QIndexMapper& indices = engine->curMatch.indices;
            engine->filterOnDemand(idx.row() - indices.last());
            row = indices.indexOf(idx.row()) + rootIndices.count();
        }
 
        if (row == -1)
            return QModelIndex();
    } else {
        if (idx.parent() != engine->curParent)
            return QModelIndex();
        row = idx.row();
    }
 
    return createIndex(row, idx.column());
}
 
bool QCompletionModel::setCurrentRow(int row)
{
    if (row < 0 || !engine->matchCount())
        return false;
 
    if (row >= engine->matchCount())
        engine->filterOnDemand(row + 1 - engine->matchCount());
 
    if (row >= engine->matchCount()) // invalid row
        return false;
 
    engine->curRow = row;
    return true;
}
 
QModelIndex QCompletionModel::currentIndex(bool sourceIndex) const
{
    if (!engine->matchCount())
        return QModelIndex();
 
    int row = engine->curRow;
    if (showAll)
        row = engine->curMatch.indices[engine->curRow];
 
    QModelIndex idx = createIndex(row, c->column);
    if (!sourceIndex)
        return idx;
    return mapToSource(idx);
}
 
QModelIndex QCompletionModel::index(int row, int column, const QModelIndex& parent) const
{
    Q_D(const QCompletionModel);
    if (row < 0 || column < 0 || column >= columnCount(parent) || parent.isValid())
        return QModelIndex();
 
    if (!showAll) {
        if (!engine->matchCount())
            return QModelIndex();
        if (row >= engine->historyMatch.indices.count()) {
            int want = row + 1 - engine->matchCount();
            if (want > 0)
                engine->filterOnDemand(want);
            if (row >= engine->matchCount())
                return QModelIndex();
        }
    } else {
        if (row >= d->model->rowCount(engine->curParent))
            return QModelIndex();
    }
 
    return createIndex(row, column);
}
 
int QCompletionModel::completionCount() const
{
    if (!engine->matchCount())
        return 0;
 
    engine->filterOnDemand(INT_MAX);
    return engine->matchCount();
}
 
int QCompletionModel::rowCount(const QModelIndex &parent) const
{
    Q_D(const QCompletionModel);
    if (parent.isValid())
        return 0;
 
    if (showAll) {
        // Show all items below current parent, even if we have no valid matches
        if (engine->curParts.size() != 1  && !engine->matchCount()
            && !engine->curParent.isValid())
            return 0;
        return d->model->rowCount(engine->curParent);
    }
 
    return completionCount();
}
 
void QCompletionModel::setFiltered(bool filtered)
{
    if (showAll == !filtered)
        return;
    beginResetModel();
    showAll = !filtered;
    endResetModel();
}
 
bool QCompletionModel::hasChildren(const QModelIndex &parent) const
{
    Q_D(const QCompletionModel);
    if (parent.isValid())
        return false;
 
    if (showAll)
        return d->model->hasChildren(mapToSource(parent));
 
    if (!engine->matchCount())
        return false;
 
    return true;
}
 
QVariant QCompletionModel::data(const QModelIndex& index, int role) const
{
    Q_D(const QCompletionModel);
    return d->model->data(mapToSource(index), role);
}
 
void QCompletionModel::modelDestroyed()
{
    QAbstractProxyModel::setSourceModel(nullptr); // switch to static empty model
    invalidate();
}
 
void QCompletionModel::rowsInserted()
{
    invalidate();
    emit rowsAdded();
}
 
void QCompletionModel::invalidate()
{
    engine->cache.clear();
    filter(engine->curParts);
}
 
void QCompletionModel::filter(const QStringList& parts)
{
    Q_D(QCompletionModel);
    beginResetModel();
    engine->filter(parts);
    endResetModel();
 
    if (d->model->canFetchMore(engine->curParent))
        d->model->fetchMore(engine->curParent);
}
 
void QCompletionEngine::filter(const QStringList& parts)
{
    const QAbstractItemModel *model = c->proxy->sourceModel();
    curParts = parts;
    if (curParts.isEmpty())
        curParts.append(QString());
 
    curRow = -1;
    curParent = QModelIndex();
    curMatch = QMatchData();
    historyMatch = filterHistory();
 
    if (!model)
        return;
 
    QModelIndex parent;
    for (int i = 0; i < curParts.size() - 1; i++) {
        QString part = curParts.at(i);
        int emi = filter(part, parent, -1).exactMatchIndex;
        if (emi == -1)
            return;
        parent = model->index(emi, c->column, parent);
    }
 
    // Note that we set the curParent to a valid parent, even if we have no matches
    // When filtering is disabled, we show all the items under this parent
    curParent = parent;
    if (curParts.constLast().isEmpty())
        curMatch = QMatchData(QIndexMapper(0, model->rowCount(curParent) - 1), -1, false);
    else
        curMatch = filter(curParts.constLast(), curParent, 1); // build at least one
    curRow = curMatch.isValid() ? 0 : -1;
}
 
QMatchData QCompletionEngine::filterHistory()
{
    QAbstractItemModel *source = c->proxy->sourceModel();
    if (curParts.size() <= 1 || c->proxy->showAll || !source)
        return QMatchData();
 
#if QT_CONFIG(filesystemmodel)
    const bool isFsModel = (qobject_cast<QFileSystemModel *>(source) != nullptr);
#else
    const bool isFsModel = false;
#endif
    Q_UNUSED(isFsModel);
    QList<int> v;
    QIndexMapper im(v);
    QMatchData m(im, -1, true);
 
    for (int i = 0; i < source->rowCount(); i++) {
        QString str = source->index(i, c->column).data().toString();
        if (str.startsWith(c->prefix, c->cs)
#if !defined(Q_OS_WIN)
            && (!isFsModel || QDir::toNativeSeparators(str) != QDir::separator())
#endif
            )
            m.indices.append(i);
    }
    return m;
}
 
// Returns a match hint from the cache by chopping the search string
bool QCompletionEngine::matchHint(const QString &part, const QModelIndex &parent, QMatchData *hint) const
{
    if (part.isEmpty())
        return false; // early out to avoid cache[parent] lookup costs
 
    const auto cit = cache.find(parent);
    if (cit == cache.end())
        return false;
 
    const CacheItem& map = *cit;
    const auto mapEnd = map.end();
 
    QString key = c->cs == Qt::CaseInsensitive ? part.toLower() : part;
 
    while (!key.isEmpty()) {
        key.chop(1);
        const auto it = map.find(key);
        if (it != mapEnd) {
            *hint = *it;
            return true;
        }
    }
 
    return false;
}
 
bool QCompletionEngine::lookupCache(const QString &part, const QModelIndex &parent, QMatchData *m) const
{
    if (part.isEmpty())
        return false; // early out to avoid cache[parent] lookup costs
 
    const auto cit = cache.find(parent);
    if (cit == cache.end())
        return false;
 
    const CacheItem& map = *cit;
 
    const QString key = c->cs == Qt::CaseInsensitive ? part.toLower() : part;
 
    const auto it = map.find(key);
    if (it == map.end())
        return false;
 
    *m = it.value();
    return true;
}
 
// When the cache size exceeds 1MB, it clears out about 1/2 of the cache.
void QCompletionEngine::saveInCache(QString part, const QModelIndex& parent, const QMatchData& m)
{
    if (c->filterMode == Qt::MatchEndsWith)
        return;
    QMatchData old = cache[parent].take(part);
    cost = cost + m.indices.cost() - old.indices.cost();
    if (cost * sizeof(int) > 1024 * 1024) {
        QMap<QModelIndex, CacheItem>::iterator it1 = cache.begin();
        while (it1 != cache.end()) {
            CacheItem& ci = it1.value();
            int sz = ci.size()/2;
            QMap<QString, QMatchData>::iterator it2 = ci.begin();
            int i = 0;
            while (it2 != ci.end() && i < sz) {
                cost -= it2.value().indices.cost();
                it2 = ci.erase(it2);
                i++;
            }
            if (ci.size() == 0) {
              it1 = cache.erase(it1);
            } else {
              ++it1;
            }
        }
    }
 
    if (c->cs == Qt::CaseInsensitive)
        part = std::move(part).toLower();
    cache[parent][part] = m;
}
 
QIndexMapper QSortedModelEngine::indexHint(QString part, const QModelIndex& parent, Qt::SortOrder order)
{
    const QAbstractItemModel *model = c->proxy->sourceModel();
 
    if (c->cs == Qt::CaseInsensitive)
        part = std::move(part).toLower();
 
    const CacheItem& map = cache[parent];
 
    // Try to find a lower and upper bound for the search from previous results
    int to = model->rowCount(parent) - 1;
    int from = 0;
    const CacheItem::const_iterator it = map.lowerBound(part);
 
    // look backward for first valid hint
    for (CacheItem::const_iterator it1 = it; it1 != map.constBegin();) {
        --it1;
        const QMatchData& value = it1.value();
        if (value.isValid()) {
            if (order == Qt::AscendingOrder) {
                from = value.indices.last() + 1;
            } else {
                to = value.indices.first() - 1;
            }
            break;
        }
    }
 
    // look forward for first valid hint
    for(CacheItem::const_iterator it2 = it; it2 != map.constEnd(); ++it2) {
        const QMatchData& value = it2.value();
        if (value.isValid() && !it2.key().startsWith(part)) {
            if (order == Qt::AscendingOrder) {
                to = value.indices.first() - 1;
            } else {
                from = value.indices.first() + 1;
            }
            break;
        }
    }
 
    return QIndexMapper(from, to);
}
 
Qt::SortOrder QSortedModelEngine::sortOrder(const QModelIndex &parent) const
{
    const QAbstractItemModel *model = c->proxy->sourceModel();
 
    int rowCount = model->rowCount(parent);
    if (rowCount < 2)
        return Qt::AscendingOrder;
    QString first = model->data(model->index(0, c->column, parent), c->role).toString();
    QString last = model->data(model->index(rowCount - 1, c->column, parent), c->role).toString();
    return QString::compare(first, last, c->cs) <= 0 ? Qt::AscendingOrder : Qt::DescendingOrder;
}
 
QMatchData QSortedModelEngine::filter(const QString& part, const QModelIndex& parent, int)
{
    const QAbstractItemModel *model = c->proxy->sourceModel();
 
    QMatchData hint;
    if (lookupCache(part, parent, &hint))
        return hint;
 
    QIndexMapper indices;
    Qt::SortOrder order = sortOrder(parent);
 
    if (matchHint(part, parent, &hint)) {
        if (!hint.isValid())
            return QMatchData();
        indices = hint.indices;
    } else {
        indices = indexHint(part, parent, order);
    }
 
    // binary search the model within 'indices' for 'part' under 'parent'
    int high = indices.to() + 1;
    int low = indices.from() - 1;
    int probe;
    QModelIndex probeIndex;
    QString probeData;
 
    while (high - low > 1)
    {
        probe = (high + low) / 2;
        probeIndex = model->index(probe, c->column, parent);
        probeData = model->data(probeIndex, c->role).toString();
        const int cmp = QString::compare(probeData, part, c->cs);
        if ((order == Qt::AscendingOrder && cmp >= 0)
            || (order == Qt::DescendingOrder && cmp < 0)) {
            high = probe;
        } else {
            low = probe;
        }
    }
 
    if ((order == Qt::AscendingOrder && low == indices.to())
        || (order == Qt::DescendingOrder && high == indices.from())) { // not found
        saveInCache(part, parent, QMatchData());
        return QMatchData();
    }
 
    probeIndex = model->index(order == Qt::AscendingOrder ? low+1 : high-1, c->column, parent);
    probeData = model->data(probeIndex, c->role).toString();
    if (!probeData.startsWith(part, c->cs)) {
        saveInCache(part, parent, QMatchData());
        return QMatchData();
    }
 
    const bool exactMatch = QString::compare(probeData, part, c->cs) == 0;
    int emi =  exactMatch ? (order == Qt::AscendingOrder ? low+1 : high-1) : -1;
 
    int from = 0;
    int to = 0;
    if (order == Qt::AscendingOrder) {
        from = low + 1;
        high = indices.to() + 1;
        low = from;
    } else {
        to = high - 1;
        low = indices.from() - 1;
        high = to;
    }
 
    while (high - low > 1)
    {
        probe = (high + low) / 2;
        probeIndex = model->index(probe, c->column, parent);
        probeData = model->data(probeIndex, c->role).toString();
        const bool startsWith = probeData.startsWith(part, c->cs);
        if ((order == Qt::AscendingOrder && startsWith)
            || (order == Qt::DescendingOrder && !startsWith)) {
            low = probe;
        } else {
            high = probe;
        }
    }
 
    QMatchData m(order == Qt::AscendingOrder ? QIndexMapper(from, high - 1) : QIndexMapper(low+1, to), emi, false);
    saveInCache(part, parent, m);
    return m;
}
 
int QUnsortedModelEngine::buildIndices(const QString& str, const QModelIndex& parent, int n,
                                      const QIndexMapper& indices, QMatchData* m)
{
    Q_ASSERT(m->partial);
    Q_ASSERT(n != -1 || m->exactMatchIndex == -1);
    const QAbstractItemModel *model = c->proxy->sourceModel();
    int i, count = 0;
 
    for (i = 0; i < indices.count() && count != n; ++i) {
        QModelIndex idx = model->index(indices[i], c->column, parent);
 
        if (!(model->flags(idx) & Qt::ItemIsSelectable))
            continue;
 
        QString data = model->data(idx, c->role).toString();
 
        switch (c->filterMode) {
        case Qt::MatchStartsWith:
            if (!data.startsWith(str, c->cs))
                continue;
            break;
        case Qt::MatchContains:
            if (!data.contains(str, c->cs))
                continue;
            break;
        case Qt::MatchEndsWith:
            if (!data.endsWith(str, c->cs))
                continue;
            break;
        case Qt::MatchExactly:
        case Qt::MatchFixedString:
        case Qt::MatchCaseSensitive:
        case Qt::MatchRegularExpression:
        case Qt::MatchWildcard:
        case Qt::MatchWrap:
        case Qt::MatchRecursive:
            Q_UNREACHABLE();
            break;
        }
        m->indices.append(indices[i]);
        ++count;
        if (m->exactMatchIndex == -1 && QString::compare(data, str, c->cs) == 0) {
            m->exactMatchIndex = indices[i];
            if (n == -1)
                return indices[i];
        }
    }
    return indices[i-1];
}
 
void QUnsortedModelEngine::filterOnDemand(int n)
{
    Q_ASSERT(matchCount());
    if (!curMatch.partial)
        return;
    Q_ASSERT(n >= -1);
    const QAbstractItemModel *model = c->proxy->sourceModel();
    int lastRow = model->rowCount(curParent) - 1;
    QIndexMapper im(curMatch.indices.last() + 1, lastRow);
    int lastIndex = buildIndices(curParts.constLast(), curParent, n, im, &curMatch);
    curMatch.partial = (lastRow != lastIndex);
    saveInCache(curParts.constLast(), curParent, curMatch);
}
 
QMatchData QUnsortedModelEngine::filter(const QString& part, const QModelIndex& parent, int n)
{
    QMatchData hint;
 
    QList<int> v;
    QIndexMapper im(v);
    QMatchData m(im, -1, true);
 
    const QAbstractItemModel *model = c->proxy->sourceModel();
    bool foundInCache = lookupCache(part, parent, &m);
 
    if (!foundInCache) {
        if (matchHint(part, parent, &hint) && !hint.isValid())
            return QMatchData();
    }
 
    if (!foundInCache && !hint.isValid()) {
        const int lastRow = model->rowCount(parent) - 1;
        QIndexMapper all(0, lastRow);
        int lastIndex = buildIndices(part, parent, n, all, &m);
        m.partial = (lastIndex != lastRow);
    } else {
        if (!foundInCache) { // build from hint as much as we can
            buildIndices(part, parent, INT_MAX, hint.indices, &m);
            m.partial = hint.partial;
        }
        if (m.partial && ((n == -1 && m.exactMatchIndex == -1) || (m.indices.count() < n))) {
            // need more and have more
            const int lastRow = model->rowCount(parent) - 1;
            QIndexMapper rest(hint.indices.last() + 1, lastRow);
            int want = n == -1 ? -1 : n - m.indices.count();
            int lastIndex = buildIndices(part, parent, want, rest, &m);
            m.partial = (lastRow != lastIndex);
        }
    }
 
    saveInCache(part, parent, m);
    return m;
}
 
QCompleterPrivate::QCompleterPrivate()
    : widget(nullptr),
      proxy(nullptr),
      popup(nullptr),
      filterMode(Qt::MatchStartsWith),
      cs(Qt::CaseSensitive),
      role(Qt::EditRole),
      column(0),
      maxVisibleItems(7),
      sorting(QCompleter::UnsortedModel),
      wrap(true),
      eatFocusOut(true),
      hiddenBecauseNoMatch(false)
{
}
 
void QCompleterPrivate::init(QAbstractItemModel *m)
{
    Q_Q(QCompleter);
    proxy = new QCompletionModel(this, q);
    QObject::connect(proxy, SIGNAL(rowsAdded()), q, SLOT(_q_autoResizePopup()));
    q->setModel(m);
#if !QT_CONFIG(listview)
    q->setCompletionMode(QCompleter::InlineCompletion);
#else
    q->setCompletionMode(QCompleter::PopupCompletion);
#endif // QT_CONFIG(listview)
}
 
void QCompleterPrivate::setCurrentIndex(QModelIndex index, bool select)
{
    Q_Q(QCompleter);
    if (!q->popup())
        return;
    if (!select) {
        popup->selectionModel()->setCurrentIndex(index, QItemSelectionModel::NoUpdate);
    } else {
        if (!index.isValid())
            popup->selectionModel()->clear();
        else
            popup->selectionModel()->setCurrentIndex(index, QItemSelectionModel::Select
                                                            | QItemSelectionModel::Rows);
    }
    index = popup->selectionModel()->currentIndex();
    if (!index.isValid())
        popup->scrollToTop();
    else
        popup->scrollTo(index, QAbstractItemView::PositionAtTop);
}
 
void QCompleterPrivate::_q_completionSelected(const QItemSelection& selection)
{
    QModelIndex index;
    if (const auto indexes = selection.indexes(); !indexes.isEmpty())
        index = indexes.first();
 
    _q_complete(index, true);
}
 
void QCompleterPrivate::_q_complete(QModelIndex index, bool highlighted)
{
    Q_Q(QCompleter);
    QString completion;
 
    if (!index.isValid() || (!proxy->showAll && (index.row() >= proxy->engine->matchCount()))) {
        completion = prefix;
        index = QModelIndex();
    } else {
        if (!(index.flags() & Qt::ItemIsEnabled))
            return;
        QModelIndex si = proxy->mapToSource(index);
        si = si.sibling(si.row(), column); // for clicked()
        completion = q->pathFromIndex(si);
#if QT_CONFIG(filesystemmodel)
        // add a trailing separator in inline
        if (mode == QCompleter::InlineCompletion) {
            if (qobject_cast<QFileSystemModel *>(proxy->sourceModel()) && QFileInfo(completion).isDir())
                completion += QDir::separator();
        }
#endif
    }
 
    if (highlighted) {
        emit q->highlighted(index);
        emit q->highlighted(completion);
    } else {
        emit q->activated(index);
        emit q->activated(completion);
    }
}
 
void QCompleterPrivate::_q_autoResizePopup()
{
    if (!popup || !popup->isVisible())
        return;
    showPopup(popupRect);
}
 
void QCompleterPrivate::showPopup(const QRect& rect)
{
    const QRect screen = widget->screen()->availableGeometry();
    Qt::LayoutDirection dir = widget->layoutDirection();
    QPoint pos;
    int rh, w;
    int h = (popup->sizeHintForRow(0) * qMin(maxVisibleItems, popup->model()->rowCount()) + 3) + 3;
    QScrollBar *hsb = popup->horizontalScrollBar();
    if (hsb && hsb->isVisible())
        h += popup->horizontalScrollBar()->sizeHint().height();
 
    if (rect.isValid()) {
        rh = rect.height();
        w = rect.width();
        pos = widget->mapToGlobal(dir == Qt::RightToLeft ? rect.bottomRight() : rect.bottomLeft());
    } else {
        rh = widget->height();
        pos = widget->mapToGlobal(QPoint(0, widget->height() - 2));
        w = widget->width();
    }
 
    if (w > screen.width())
        w = screen.width();
    if ((pos.x() + w) > (screen.x() + screen.width()))
        pos.setX(screen.x() + screen.width() - w);
    if (pos.x() < screen.x())
        pos.setX(screen.x());
 
    int top = pos.y() - rh - screen.top() + 2;
    int bottom = screen.bottom() - pos.y();
    h = qMax(h, popup->minimumHeight());
    if (h > bottom) {
        h = qMin(qMax(top, bottom), h);
 
        if (top > bottom)
            pos.setY(pos.y() - h - rh + 2);
    }
 
    popup->setGeometry(pos.x(), pos.y(), w, h);
 
    if (!popup->isVisible())
        popup->show();
}
 
#if QT_CONFIG(filesystemmodel)
static bool isRoot(const QFileSystemModel *model, const QString &path)
{
    const auto index = model->index(path);
    return index.isValid() && model->fileInfo(index).isRoot();
}
 
static bool completeOnLoaded(const QFileSystemModel *model,
                             const QString &nativePrefix,
                             const QString &path,
                             Qt::CaseSensitivity caseSensitivity)
{
    const auto pathSize = path.size();
    const auto prefixSize = nativePrefix.size();
    if (prefixSize < pathSize)
        return false;
    const QString prefix = QDir::fromNativeSeparators(nativePrefix);
    if (prefixSize == pathSize)
        return path.compare(prefix, caseSensitivity) == 0 && isRoot(model, path);
    // The user is typing something within that directory and is not in a subdirectory yet.
    const auto separator = u'/';
    return prefix.startsWith(path, caseSensitivity) && prefix.at(pathSize) == separator
        && !QStringView{prefix}.right(prefixSize - pathSize - 1).contains(separator);
}
 
void QCompleterPrivate::_q_fileSystemModelDirectoryLoaded(const QString &path)
{
    Q_Q(QCompleter);
    // Slot called when QFileSystemModel has finished loading.
    // If we hide the popup because there was no match because the model was not loaded yet,
    // we re-start the completion when we get the results (unless triggered by
    // something else, see QTBUG-14292).
    if (hiddenBecauseNoMatch && widget) {
        if (auto model = qobject_cast<const QFileSystemModel *>(proxy->sourceModel())) {
            if (completeOnLoaded(model, prefix, path, cs))
                q->complete();
        }
    }
}
#else // QT_CONFIG(filesystemmodel)
void QCompleterPrivate::_q_fileSystemModelDirectoryLoaded(const QString &) {}
#endif
 
QCompleter::QCompleter(QObject *parent)
: QObject(*new QCompleterPrivate(), parent)
{
    Q_D(QCompleter);
    d->init();
}
 
QCompleter::QCompleter(QAbstractItemModel *model, QObject *parent)
    : QObject(*new QCompleterPrivate(), parent)
{
    Q_D(QCompleter);
    d->init(model);
}
 
#if QT_CONFIG(stringlistmodel)
QCompleter::QCompleter(const QStringList& list, QObject *parent)
: QObject(*new QCompleterPrivate(), parent)
{
    Q_D(QCompleter);
    d->init(new QStringListModel(list, this));
}
#endif // QT_CONFIG(stringlistmodel)
 
QCompleter::~QCompleter()
{
}
 
void QCompleter::setWidget(QWidget *widget)
{
    Q_D(QCompleter);
    if (widget == d->widget)
        return;
 
    if (d->widget)
        d->widget->removeEventFilter(this);
    d->widget = widget;
    if (d->widget)
        d->widget->installEventFilter(this);
 
    if (d->popup) {
        d->popup->hide();
        d->popup->setFocusProxy(d->widget);
    }
}
 
QWidget *QCompleter::widget() const
{
    Q_D(const QCompleter);
    return d->widget;
}
 
void QCompleter::setModel(QAbstractItemModel *model)
{
    Q_D(QCompleter);
    QAbstractItemModel *oldModel = d->proxy->sourceModel();
    if (oldModel == model)
        return;
#if QT_CONFIG(filesystemmodel)
    if (qobject_cast<const QFileSystemModel *>(oldModel))
        setCompletionRole(Qt::EditRole); // QTBUG-54642, clear FileNameRole set by QFileSystemModel
#endif
    d->proxy->setSourceModel(model);
    if (d->popup)
        setPopup(d->popup); // set the model and make new connections
    if (oldModel && oldModel->QObject::parent() == this)
        delete oldModel;
#if QT_CONFIG(filesystemmodel)
    QFileSystemModel *fsModel = qobject_cast<QFileSystemModel *>(model);
    if (fsModel) {
#if defined(Q_OS_WIN)
        setCaseSensitivity(Qt::CaseInsensitive);
#else
        setCaseSensitivity(Qt::CaseSensitive);
#endif
        setCompletionRole(QFileSystemModel::FileNameRole);
        connect(fsModel, SIGNAL(directoryLoaded(QString)), this, SLOT(_q_fileSystemModelDirectoryLoaded(QString)));
    }
#endif // QT_CONFIG(filesystemmodel)
}
 
QAbstractItemModel *QCompleter::model() const
{
    Q_D(const QCompleter);
    return d->proxy->sourceModel();
}
 
void QCompleter::setCompletionMode(QCompleter::CompletionMode mode)
{
    Q_D(QCompleter);
    d->mode = mode;
    d->proxy->setFiltered(mode != QCompleter::UnfilteredPopupCompletion);
 
    if (mode == QCompleter::InlineCompletion) {
        if (d->widget)
            d->widget->removeEventFilter(this);
        if (d->popup) {
            d->popup->deleteLater();
            d->popup = nullptr;
        }
    } else {
        if (d->widget)
            d->widget->installEventFilter(this);
    }
}
 
QCompleter::CompletionMode QCompleter::completionMode() const
{
    Q_D(const QCompleter);
    return d->mode;
}
 
void QCompleter::setFilterMode(Qt::MatchFlags filterMode)
{
    Q_D(QCompleter);
 
    if (d->filterMode == filterMode)
        return;
 
    if (Q_UNLIKELY(filterMode != Qt::MatchStartsWith &&
                   filterMode != Qt::MatchContains &&
                   filterMode != Qt::MatchEndsWith)) {
        qWarning("Unhandled QCompleter::filterMode flag is used.");
        return;
    }
 
    d->filterMode = filterMode;
    d->proxy->createEngine();
    d->proxy->invalidate();
}
 
Qt::MatchFlags QCompleter::filterMode() const
{
    Q_D(const QCompleter);
    return d->filterMode;
}
 
void QCompleter::setPopup(QAbstractItemView *popup)
{
    Q_ASSERT(popup);
    Q_D(QCompleter);
    if (popup == d->popup)
        return;
 
    // Remember existing widget's focus policy, default to NoFocus
    const Qt::FocusPolicy origPolicy = d->widget ? d->widget->focusPolicy()
                                                 : Qt::NoFocus;
 
    // If popup existed already, disconnect signals and delete object
    if (d->popup) {
        QObject::disconnect(d->popup->selectionModel(), nullptr, this, nullptr);
        QObject::disconnect(d->popup, nullptr, this, nullptr);
        delete d->popup;
    }
 
    // Assign new object, set model and hide
    d->popup = popup;
    if (d->popup->model() != d->proxy)
        d->popup->setModel(d->proxy);
    d->popup->hide();
 
    // Mark the widget window as a popup, so that if the last non-popup window is closed by the
    // user, the application should not be prevented from exiting. It needs to be set explicitly via
    // setWindowFlag(), because passing the flag via setParent(parent, windowFlags) does not call
    // QWidgetPrivate::adjustQuitOnCloseAttribute(), and causes an application not to exit if the
    // popup ends up being the last window.
    d->popup->setParent(nullptr);
    d->popup->setWindowFlag(Qt::Popup);
    d->popup->setFocusPolicy(Qt::NoFocus);
    if (d->widget)
        d->widget->setFocusPolicy(origPolicy);
 
    d->popup->setFocusProxy(d->widget);
    d->popup->installEventFilter(this);
    d->popup->setItemDelegate(new QCompleterItemDelegate(d->popup));
#if QT_CONFIG(listview)
    if (QListView *listView = qobject_cast<QListView *>(d->popup)) {
        listView->setModelColumn(d->column);
    }
#endif
 
    QObject::connect(d->popup, SIGNAL(clicked(QModelIndex)),
                     this, SLOT(_q_complete(QModelIndex)));
    QObject::connect(this, SIGNAL(activated(QModelIndex)),
                     d->popup, SLOT(hide()));
 
    QObject::connect(d->popup->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
                     this, SLOT(_q_completionSelected(QItemSelection)));
}
 
QAbstractItemView *QCompleter::popup() const
{
    Q_D(const QCompleter);
#if QT_CONFIG(listview)
    if (!d->popup && completionMode() != QCompleter::InlineCompletion) {
        QListView *listView = new QListView;
        listView->setEditTriggers(QAbstractItemView::NoEditTriggers);
        listView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        listView->setSelectionBehavior(QAbstractItemView::SelectRows);
        listView->setSelectionMode(QAbstractItemView::SingleSelection);
        listView->setModelColumn(d->column);
        QCompleter *that = const_cast<QCompleter*>(this);
        that->setPopup(listView);
    }
#endif // QT_CONFIG(listview)
    return d->popup;
}
 
bool QCompleter::event(QEvent *ev)
{
    return QObject::event(ev);
}
 
bool QCompleter::eventFilter(QObject *o, QEvent *e)
{
    Q_D(QCompleter);
 
    if (o == d->widget) {
        switch (e->type()) {
        case QEvent::FocusOut:
            if (d->eatFocusOut) {
                d->hiddenBecauseNoMatch = false;
                if (d->popup && d->popup->isVisible())
                    return true;
            }
            break;
        case QEvent::Hide:
            if (d->popup)
                d->popup->hide();
            break;
        default:
            break;
        }
    }
 
    if (o != d->popup)
        return QObject::eventFilter(o, e);
 
    Q_ASSERT(d->popup);
    switch (e->type()) {
    case QEvent::KeyPress: {
        QKeyEvent *ke = static_cast<QKeyEvent *>(e);
 
        QModelIndex curIndex = d->popup->currentIndex();
        QModelIndexList selList = d->popup->selectionModel()->selectedIndexes();
 
        const int key = ke->key();
        // In UnFilteredPopup mode, select the current item
        if ((key == Qt::Key_Up || key == Qt::Key_Down) && selList.isEmpty() && curIndex.isValid()
            && d->mode == QCompleter::UnfilteredPopupCompletion) {
              d->setCurrentIndex(curIndex);
              return true;
        }
 
        // Handle popup navigation keys. These are hardcoded because up/down might make the
        // widget do something else (lineedit cursor moves to home/end on mac, for instance)
        switch (key) {
        case Qt::Key_End:
        case Qt::Key_Home:
            if (ke->modifiers() & Qt::ControlModifier)
                return false;
            break;
 
        case Qt::Key_Up:
            if (!curIndex.isValid()) {
                int rowCount = d->proxy->rowCount();
                QModelIndex lastIndex = d->proxy->index(rowCount - 1, d->column);
                d->setCurrentIndex(lastIndex);
                return true;
            } else if (curIndex.row() == 0) {
                if (d->wrap)
                    d->setCurrentIndex(QModelIndex());
                return true;
            }
            return false;
 
        case Qt::Key_Down:
            if (!curIndex.isValid()) {
                QModelIndex firstIndex = d->proxy->index(0, d->column);
                d->setCurrentIndex(firstIndex);
                return true;
            } else if (curIndex.row() == d->proxy->rowCount() - 1) {
                if (d->wrap)
                    d->setCurrentIndex(QModelIndex());
                return true;
            }
            return false;
 
        case Qt::Key_PageUp:
        case Qt::Key_PageDown:
            return false;
        }
 
        // Send the event to the widget. If the widget accepted the event, do nothing
        // If the widget did not accept the event, provide a default implementation
        d->eatFocusOut = false;
        (static_cast<QObject *>(d->widget))->event(ke);
        d->eatFocusOut = true;
        if (!d->widget || e->isAccepted() || !d->popup->isVisible()) {
            // widget lost focus, hide the popup
            if (d->widget && (!d->widget->hasFocus()
#ifdef QT_KEYPAD_NAVIGATION
                || (QApplicationPrivate::keypadNavigationEnabled() && !d->widget->hasEditFocus())
#endif
                ))
                d->popup->hide();
            if (e->isAccepted())
                return true;
        }
 
        // default implementation for keys not handled by the widget when popup is open
#if QT_CONFIG(shortcut)
        if (ke->matches(QKeySequence::Cancel)) {
            d->popup->hide();
            return true;
        }
#endif
        switch (key) {
#ifdef QT_KEYPAD_NAVIGATION
        case Qt::Key_Select:
            if (!QApplicationPrivate::keypadNavigationEnabled())
                break;
#endif
        case Qt::Key_Return:
        case Qt::Key_Enter:
        case Qt::Key_Tab:
            d->popup->hide();
            if (curIndex.isValid())
                d->_q_complete(curIndex);
            break;
 
        case Qt::Key_F4:
            if (ke->modifiers() & Qt::AltModifier)
                d->popup->hide();
            break;
 
        case Qt::Key_Backtab:
            d->popup->hide();
            break;
 
        default:
            break;
        }
 
        return true;
    }
 
#ifdef QT_KEYPAD_NAVIGATION
    case QEvent::KeyRelease: {
        QKeyEvent *ke = static_cast<QKeyEvent *>(e);
        if (QApplicationPrivate::keypadNavigationEnabled() && ke->key() == Qt::Key_Back) {
            // Send the event to the 'widget'. This is what we did for KeyPress, so we need
            // to do the same for KeyRelease, in case the widget's KeyPress event set
            // up something (such as a timer) that is relying on also receiving the
            // key release. I see this as a bug in Qt, and should really set it up for all
            // the affected keys. However, it is difficult to tell how this will affect
            // existing code, and I can't test for every combination!
            d->eatFocusOut = false;
            static_cast<QObject *>(d->widget)->event(ke);
            d->eatFocusOut = true;
        }
        break;
    }
#endif
 
    case QEvent::MouseButtonPress: {
#ifdef QT_KEYPAD_NAVIGATION
        if (QApplicationPrivate::keypadNavigationEnabled()) {
            // if we've clicked in the widget (or its descendant), let it handle the click
            QWidget *source = qobject_cast<QWidget *>(o);
            if (source) {
                QPoint pos = source->mapToGlobal((static_cast<QMouseEvent *>(e))->pos());
                QWidget *target = QApplication::widgetAt(pos);
                if (target && (d->widget->isAncestorOf(target) ||
                    target == d->widget)) {
                    d->eatFocusOut = false;
                    static_cast<QObject *>(target)->event(e);
                    d->eatFocusOut = true;
                    return true;
                }
            }
        }
#endif
        if (!d->popup->underMouse()) {
            d->popup->hide();
            return true;
        }
        }
        return false;
 
    case QEvent::InputMethod:
    case QEvent::ShortcutOverride:
        QCoreApplication::sendEvent(d->widget, e);
        break;
 
    default:
        return false;
    }
    return false;
}
 
void QCompleter::complete(const QRect& rect)
{
    Q_D(QCompleter);
    QModelIndex idx = d->proxy->currentIndex(false);
    d->hiddenBecauseNoMatch = false;
    if (d->mode == QCompleter::InlineCompletion) {
        if (idx.isValid())
            d->_q_complete(idx, true);
        return;
    }
 
    Q_ASSERT(d->widget);
    if ((d->mode == QCompleter::PopupCompletion && !idx.isValid())
        || (d->mode == QCompleter::UnfilteredPopupCompletion && d->proxy->rowCount() == 0)) {
        if (d->popup)
            d->popup->hide(); // no suggestion, hide
        d->hiddenBecauseNoMatch = true;
        return;
    }
 
    popup();
    if (d->mode == QCompleter::UnfilteredPopupCompletion)
        d->setCurrentIndex(idx, false);
 
    d->showPopup(rect);
    d->popupRect = rect;
}
 
bool QCompleter::setCurrentRow(int row)
{
    Q_D(QCompleter);
    return d->proxy->setCurrentRow(row);
}
 
int QCompleter::currentRow() const
{
    Q_D(const QCompleter);
    return d->proxy->currentRow();
}
 
int QCompleter::completionCount() const
{
    Q_D(const QCompleter);
    return d->proxy->completionCount();
}
 
void QCompleter::setModelSorting(QCompleter::ModelSorting sorting)
{
    Q_D(QCompleter);
    if (d->sorting == sorting)
        return;
    d->sorting = sorting;
    d->proxy->createEngine();
    d->proxy->invalidate();
}
 
QCompleter::ModelSorting QCompleter::modelSorting() const
{
    Q_D(const QCompleter);
    return d->sorting;
}
 
void QCompleter::setCompletionColumn(int column)
{
    Q_D(QCompleter);
    if (d->column == column)
        return;
#if QT_CONFIG(listview)
    if (QListView *listView = qobject_cast<QListView *>(d->popup))
        listView->setModelColumn(column);
#endif
    d->column = column;
    d->proxy->invalidate();
}
 
int QCompleter::completionColumn() const
{
    Q_D(const QCompleter);
    return d->column;
}
 
void QCompleter::setCompletionRole(int role)
{
    Q_D(QCompleter);
    if (d->role == role)
        return;
    d->role = role;
    d->proxy->invalidate();
}
 
int QCompleter::completionRole() const
{
    Q_D(const QCompleter);
    return d->role;
}
 
void QCompleter::setWrapAround(bool wrap)
{
    Q_D(QCompleter);
    if (d->wrap == wrap)
        return;
    d->wrap = wrap;
}
 
bool QCompleter::wrapAround() const
{
    Q_D(const QCompleter);
    return d->wrap;
}
 
int QCompleter::maxVisibleItems() const
{
    Q_D(const QCompleter);
    return d->maxVisibleItems;
}
 
void QCompleter::setMaxVisibleItems(int maxItems)
{
    Q_D(QCompleter);
    if (Q_UNLIKELY(maxItems < 0)) {
        qWarning("QCompleter::setMaxVisibleItems: "
                 "Invalid max visible items (%d) must be >= 0", maxItems);
        return;
    }
    d->maxVisibleItems = maxItems;
}
 
void QCompleter::setCaseSensitivity(Qt::CaseSensitivity cs)
{
    Q_D(QCompleter);
    if (d->cs == cs)
        return;
    d->cs = cs;
    d->proxy->createEngine();
    d->proxy->invalidate();
}
 
Qt::CaseSensitivity QCompleter::caseSensitivity() const
{
    Q_D(const QCompleter);
    return d->cs;
}
 
void QCompleter::setCompletionPrefix(const QString &prefix)
{
    Q_D(QCompleter);
    d->prefix = prefix;
    d->proxy->filter(splitPath(prefix));
}
 
QString QCompleter::completionPrefix() const
{
    Q_D(const QCompleter);
    return d->prefix;
}
 
QModelIndex QCompleter::currentIndex() const
{
    Q_D(const QCompleter);
    return d->proxy->currentIndex(false);
}
 
QString QCompleter::currentCompletion() const
{
    Q_D(const QCompleter);
    return pathFromIndex(d->proxy->currentIndex(true));
}
 
QAbstractItemModel *QCompleter::completionModel() const
{
    Q_D(const QCompleter);
    return d->proxy;
}
 
QString QCompleter::pathFromIndex(const QModelIndex& index) const
{
    Q_D(const QCompleter);
    if (!index.isValid())
        return QString();
 
    QAbstractItemModel *sourceModel = d->proxy->sourceModel();
    if (!sourceModel)
        return QString();
    bool isFsModel = false;
#if QT_CONFIG(filesystemmodel)
    isFsModel = qobject_cast<QFileSystemModel *>(d->proxy->sourceModel()) != nullptr;
#endif
    if (!isFsModel)
        return sourceModel->data(index, d->role).toString();
 
    QModelIndex idx = index;
    QStringList list;
    do {
        QString t;
#if QT_CONFIG(filesystemmodel)
        t = sourceModel->data(idx, QFileSystemModel::FileNameRole).toString();
#endif
        list.prepend(t);
        QModelIndex parent = idx.parent();
        idx = parent.sibling(parent.row(), index.column());
    } while (idx.isValid());
 
#if !defined(Q_OS_WIN)
    if (list.size() == 1) // only the separator or some other text
        return list[0];
    list[0].clear() ; // the join below will provide the separator
#endif
 
    return list.join(QDir::separator());
}
 
QStringList QCompleter::splitPath(const QString& path) const
{
    bool isFsModel = false;
#if QT_CONFIG(filesystemmodel)
    Q_D(const QCompleter);
    isFsModel = qobject_cast<QFileSystemModel *>(d->proxy->sourceModel()) != nullptr;
#endif
 
    if (!isFsModel || path.isEmpty())
        return QStringList(completionPrefix());
 
    QString pathCopy = QDir::toNativeSeparators(path);
#if defined(Q_OS_WIN)
    if (pathCopy == "\\"_L1 || pathCopy == "\\\\"_L1)
        return QStringList(pathCopy);
    const bool startsWithDoubleSlash = pathCopy.startsWith("\\\\"_L1);
    if (startsWithDoubleSlash)
        pathCopy = pathCopy.mid(2);
#endif
 
    const QChar sep = QDir::separator();
    QStringList parts = pathCopy.split(sep);
 
#if defined(Q_OS_WIN)
    if (startsWithDoubleSlash)
        parts[0].prepend("\\\\"_L1);
#else
    if (pathCopy[0] == sep) // readd the "/" at the beginning as the split removed it
        parts[0] = u'/';
#endif
 
    return parts;
}
 
QT_END_NAMESPACE
 
#include "moc_qcompleter.cpp"
 
#include "moc_qcompleter_p.cpp"