foldermodel.cpp

/***************************************************************************
 *   Copyright (C) 2006 David Faure <faure@kde.org>                        *
 *   Copyright (C) 2008 Fredrik Höglund <fredrik@kde.org>                  *
 *   Copyright (C) 2008 Rafael Fernández López <ereslibre@kde.org>           *
 *   Copyright (C) 2011 Marco Martin <mart@kde.org>                        *
 *   Copyright (C) 2014 by Eike Hein <hein@kde.org>                        *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *
 ***************************************************************************/

#include "foldermodel.h"
#include "itemviewadapter.h"
#include "positioner.h"
#include "screenmapper.h"

#include <QApplication>
#include <QClipboard>
#include <QCollator>
#include <QDesktopWidget>
#include <QDrag>
#include <QImage>
#include <QItemSelectionModel>
#include <QMenu>
#include <QMimeData>
#include <QMimeDatabase>
#include <QPainter>
#include <QPixmap>
#include <QQuickItem>
#include <QQuickWindow>
#include <QTimer>
#include <QLoggingCategory>
#include <qplatformdefs.h>

#include <KDirWatch>
#include <KIO/DropJob>
#include <KAuthorized>
#include <KConfigGroup>
#include <KFileCopyToMenu>
#include <KFileItemActions>
#include <KFileItemListProperties>
#include <KNewFileMenu>
#include <KIO/DeleteJob>
#include <KIO/EmptyTrashJob>
#include <KIO/FileUndoManager>
#include <KIO/JobUiDelegate>
#include <KIO/Paste>
#include <KIO/PasteJob>
#include <KIO/RestoreJob>
#include <KLocalizedString>
#include <KPropertiesDialog>
#include <KSharedConfig>
#include <KShell>

#include <KCoreDirLister>
#include <KDirLister>
#include <KDesktopFile>
#include <KDirModel>
#include <KIO/CopyJob>
#include <KIO/Job>
#include <KProtocolInfo>
#include <KRun>

#include <Plasma/Applet>
#include <Plasma/Containment>
#include <Plasma/Corona>

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

Q_LOGGING_CATEGORY(FOLDERMODEL, "plasma.containments.desktop.folder.foldermodel")

DirLister::DirLister(QObject *parent) : KDirLister(parent)
{
}

DirLister:: ~DirLister()
{
}

void DirLister::handleError(KIO::Job *job)
{
    if (!autoErrorHandlingEnabled()) {
        emit error(job->errorString());
        return;
    }

    KDirLister::handleError(job);
}

FolderModel::FolderModel(QObject *parent) : QSortFilterProxyModel(parent),
    m_dirWatch(nullptr),
    m_dragInProgress(false),
    m_urlChangedWhileDragging(false),
    m_dropTargetPositionsCleanup(new QTimer(this)),
    m_previewGenerator(nullptr),
    m_viewAdapter(nullptr),
    m_actionCollection(this),
    m_newMenu(nullptr),
    m_fileItemActions(nullptr),
    m_usedByContainment(false),
    m_locked(true),
    m_sortMode(0),
    m_sortDesc(false),
    m_sortDirsFirst(true),
    m_parseDesktopFiles(false),
    m_previews(false),
    m_filterMode(NoFilter),
    m_filterPatternMatchAll(true),
    m_screenMapper(ScreenMapper::instance()),
    m_complete(false)
{
    //needed to pass the job around with qml
    qmlRegisterType<KIO::DropJob>();
    DirLister *dirLister = new DirLister(this);
    dirLister->setDelayedMimeTypes(true);
    dirLister->setAutoErrorHandlingEnabled(false, nullptr);
    connect(dirLister, &DirLister::error, this, &FolderModel::dirListFailed);
    connect(dirLister, &KCoreDirLister::itemsDeleted, this, &FolderModel::evictFromIsDirCache);

    connect(dirLister, &KCoreDirLister::started, this, std::bind(&FolderModel::setStatus, this, Status::Listing));

    void (KCoreDirLister::*myCompletedSignal)() = &KCoreDirLister::completed;
    QObject::connect(dirLister, myCompletedSignal, this, [this] {
        setStatus(Status::Ready);
        emit listingCompleted();
    });

    void (KCoreDirLister::*myCanceledSignal)() = &KCoreDirLister::canceled;
    QObject::connect(dirLister, myCanceledSignal, this, [this] {
        setStatus(Status::Canceled);
        emit listingCanceled();
    });

    m_dirModel = new KDirModel(this);
    m_dirModel->setDirLister(dirLister);
    m_dirModel->setDropsAllowed(KDirModel::DropOnDirectory | KDirModel::DropOnLocalExecutable);

    /*
     * position dropped items at the desired target position
     * delay this via queued connection, such that the row is available and can be mapped
     * when we emit the move request
     */
    connect(this, &QAbstractItemModel::rowsInserted,
            this, [this](const QModelIndex &parent, int first, int last) {
        for (int i = first; i <= last; ++i) {
            const auto idx = index(i, 0, parent);
            const auto url = itemForIndex(idx).url();
            auto it = m_dropTargetPositions.find(url.fileName());
            if (it != m_dropTargetPositions.end()) {
                const auto pos = it.value();
                m_dropTargetPositions.erase(it);
                setSortMode(-1);
                emit move(pos.x(), pos.y(), {url});
            }
        }
    });
    /*
     * Dropped files may not actually show up as new files, e.g. when we overwrite
     * an existing file. Or files that fail to be listed by the dirLister, or...
     * To ensure we don't grow the map indefinitely, clean it up periodically.
     * The cleanup timer is (re)started whenever we modify the map. We use a quite
     * high interval of 10s. This should ensure, that we don't accidentally wipe
     * the mapping when we actually still want to use it. Since the time between
     * adding an entry in the map and it showing up in the model should be
     * small, this should rarely, if ever happen.
     */
    m_dropTargetPositionsCleanup->setInterval(10000);
    m_dropTargetPositionsCleanup->setSingleShot(true);
    connect(m_dropTargetPositionsCleanup, &QTimer::timeout, this, [this]() {
        if (!m_dropTargetPositions.isEmpty()) {
            qCDebug(FOLDERMODEL) << "clearing drop target positions after timeout:" << m_dropTargetPositions;
            m_dropTargetPositions.clear();
        }
    });

    m_selectionModel = new QItemSelectionModel(this, this);
    connect(m_selectionModel, &QItemSelectionModel::selectionChanged,
            this, &FolderModel::selectionChanged);

    setSourceModel(m_dirModel);

    setSortLocaleAware(true);
    setFilterCaseSensitivity(Qt::CaseInsensitive);
    setDynamicSortFilter(true);

    sort(m_sortMode, m_sortDesc ? Qt::DescendingOrder : Qt::AscendingOrder);

    createActions();
}

FolderModel::~FolderModel()
{
    if (m_usedByContainment) {
        // disconnect so we don't handle signals from the screen mapper when
        // removeScreen is called
        m_screenMapper->disconnect(this);
        m_screenMapper->removeScreen(m_screen, resolvedUrl());
    }
}

QHash< int, QByteArray > FolderModel::roleNames() const
{
    return staticRoleNames();
}

QHash< int, QByteArray > FolderModel::staticRoleNames()
{
    QHash<int, QByteArray> roleNames;
    roleNames[Qt::DisplayRole] = "display";
    roleNames[Qt::DecorationRole] = "decoration";
    roleNames[BlankRole] = "blank";
    roleNames[OverlaysRole] = "overlays";
    roleNames[SelectedRole] = "selected";
    roleNames[IsDirRole] = "isDir";
    roleNames[IsLinkRole] = "isLink";
    roleNames[IsHiddenRole] = "isHidden";
    roleNames[UrlRole] = "url";
    roleNames[LinkDestinationUrl] = "linkDestinationUrl";
    roleNames[SizeRole] = "size";
    roleNames[TypeRole] = "type";

    return roleNames;
}

void FolderModel::classBegin()
{
}

void FolderModel::componentComplete()
{
    m_complete = true;
    invalidate();
}

void FolderModel::invalidateIfComplete()
{
    if (!m_complete) {
        return;
    }

    invalidate();
}

void FolderModel::invalidateFilterIfComplete()
{
    if (!m_complete) {
        return;
    }

    invalidateFilter();
}

void FolderModel::newFileMenuItemCreated(const QUrl &url)
{
    if (m_usedByContainment && !m_screenMapper->sharedDesktops()) {
        m_screenMapper->addMapping(url, m_screen, ScreenMapper::DelayedSignal);
        m_dropTargetPositions.insert(url.fileName(), m_menuPosition);
        m_menuPosition = {};
        m_dropTargetPositionsCleanup->start();
    }
}

QString FolderModel::url() const
{
    return m_url;
}

void FolderModel::setUrl(const QString& url)
{
    const QUrl &resolvedNewUrl = resolve(url);

    if (url == m_url) {
        m_dirModel->dirLister()->updateDirectory(resolvedNewUrl);
        return;
    }

    const auto oldUrl = resolvedUrl();

    beginResetModel();
    m_url = url;
    m_isDirCache.clear();
    m_dirModel->dirLister()->openUrl(resolvedNewUrl);
    clearDragImages();
    m_dragIndexes.clear();
    endResetModel();

    emit urlChanged();
    emit resolvedUrlChanged();

    m_errorString.clear();
    emit errorStringChanged();

    if (m_dirWatch) {
        delete m_dirWatch;
        m_dirWatch = nullptr;
    }

    if (resolvedNewUrl.isValid()) {
        m_dirWatch = new KDirWatch(this);
        connect(m_dirWatch, &KDirWatch::created, this, &FolderModel::iconNameChanged);
        connect(m_dirWatch, &KDirWatch::dirty, this, &FolderModel::iconNameChanged);
        m_dirWatch->addFile(resolvedNewUrl.toLocalFile() + QLatin1String("/.directory"));
    }

    if (m_dragInProgress) {
        m_urlChangedWhileDragging = true;
    }

    emit iconNameChanged();

    if (m_usedByContainment && !m_screenMapper->sharedDesktops()) {
        m_screenMapper->removeScreen(m_screen, oldUrl);
        m_screenMapper->addScreen(m_screen, resolvedUrl());
    }
}

QUrl FolderModel::resolvedUrl() const
{
    return m_dirModel->dirLister()->url();
}

QUrl FolderModel::resolve(const QString& url)
{
    QUrl resolvedUrl;

    if (url.startsWith(QLatin1Char('~'))) {
        resolvedUrl = QUrl::fromLocalFile(KShell::tildeExpand(url));
    } else {
        resolvedUrl = QUrl::fromUserInput(url);
    }

    return resolvedUrl;
}

QString FolderModel::iconName() const
{
    const KFileItem rootItem(m_dirModel->dirLister()->url());

    if (!rootItem.isFinalIconKnown()) {
        rootItem.determineMimeType();
    }

    return rootItem.iconName();
}

FolderModel::Status FolderModel::status() const
{
    return m_status;
}

void FolderModel::setStatus(Status status)
{
    if (m_status != status) {
        m_status = status;
        emit statusChanged();
    }
}

QString FolderModel::errorString() const
{
    return m_errorString;
}

bool FolderModel::dragging() const
{
    return m_dragInProgress;
}

bool FolderModel::usedByContainment() const
{
    return m_usedByContainment;
}

void FolderModel::setUsedByContainment(bool used)
{
    if (m_usedByContainment != used) {
        m_usedByContainment = used;

        QAction *action = m_actionCollection.action(QStringLiteral("refresh"));

        if (action) {
            action->setText(m_usedByContainment ? i18n("&Refresh Desktop") : i18n("&Refresh View"));
            action->setIcon(m_usedByContainment ? QIcon::fromTheme(QStringLiteral("user-desktop")) : QIcon::fromTheme(QStringLiteral("view-refresh")));
        }

        m_screenMapper->disconnect(this);
        connect(m_screenMapper, &ScreenMapper::screensChanged, this, &FolderModel::invalidateFilterIfComplete);
        connect(m_screenMapper, &ScreenMapper::screenMappingChanged, this, &FolderModel::invalidateFilterIfComplete);

        emit usedByContainmentChanged();
    }
}

bool FolderModel::locked() const
{
    return m_locked;
}

void FolderModel::setLocked(bool locked)
{
    if (m_locked != locked) {
        m_locked = locked;

        emit lockedChanged();
    }
}

void FolderModel::dirListFailed(const QString& error)
{
    m_errorString = error;
    emit errorStringChanged();
}

int FolderModel::sortMode() const
{
    return m_sortMode;
}

void FolderModel::setSortMode(int mode)
{
    if (m_sortMode != mode) {
        m_sortMode = mode;

        if (mode == -1 /* Unsorted */) {
            setDynamicSortFilter(false);
        } else {
            invalidateIfComplete();
            sort(m_sortMode, m_sortDesc ? Qt::DescendingOrder : Qt::AscendingOrder);
            setDynamicSortFilter(true);
        }

        emit sortModeChanged();
    }
}

bool FolderModel::sortDesc() const
{
    return m_sortDesc;
}

void FolderModel::setSortDesc(bool desc)
{
    if (m_sortDesc != desc) {
        m_sortDesc = desc;

        if (m_sortMode != -1 /* Unsorted */) {
            invalidateIfComplete();
            sort(m_sortMode, m_sortDesc ? Qt::DescendingOrder : Qt::AscendingOrder);
        }

        emit sortDescChanged();
    }
}

bool FolderModel::sortDirsFirst() const
{
    return m_sortDirsFirst;
}

void FolderModel::setSortDirsFirst(bool enable)
{
    if (m_sortDirsFirst != enable) {
        m_sortDirsFirst = enable;

        if (m_sortMode != -1 /* Unsorted */) {
            invalidateIfComplete();
            sort(m_sortMode, m_sortDesc ? Qt::DescendingOrder : Qt::AscendingOrder);
        }

        emit sortDirsFirstChanged();
    }
}

bool FolderModel::parseDesktopFiles() const
{
    return m_parseDesktopFiles;
}

void FolderModel::setParseDesktopFiles(bool enable)
{
    if (m_parseDesktopFiles != enable) {
        m_parseDesktopFiles = enable;
        emit parseDesktopFilesChanged();
    }
}

QObject* FolderModel::viewAdapter() const
{
    return m_viewAdapter;
}

void FolderModel::setViewAdapter(QObject* adapter)
{
    if (m_viewAdapter != adapter) {
        KAbstractViewAdapter *abstractViewAdapter = dynamic_cast<KAbstractViewAdapter *>(adapter);

        m_viewAdapter = abstractViewAdapter;

        if (m_viewAdapter && !m_previewGenerator) {
            m_previewGenerator = new KFilePreviewGenerator(abstractViewAdapter, this);
            m_previewGenerator->setPreviewShown(m_previews);
            m_previewGenerator->setEnabledPlugins(m_previewPlugins);
        }

        emit viewAdapterChanged();
    }
}

bool FolderModel::previews() const
{
    return m_previews;
}

void FolderModel::setPreviews(bool previews)
{
    if (m_previews != previews) {
        m_previews = previews;

        if (m_previewGenerator) {
            m_previewGenerator->setPreviewShown(m_previews);
        }

        emit previewsChanged();
    }
}

QStringList FolderModel::previewPlugins() const
{
    return m_previewPlugins;
}

void FolderModel::setPreviewPlugins(const QStringList& previewPlugins)
{
    if (m_previewPlugins != previewPlugins) {
        m_previewPlugins = previewPlugins;

        if (m_previewGenerator) {
            m_previewGenerator->setPreviewShown(false);
            m_previewGenerator->setEnabledPlugins(m_previewPlugins);
            m_previewGenerator->setPreviewShown(true);
        }

        emit previewPluginsChanged();
    }
}

int FolderModel::filterMode() const
{
    return m_filterMode;
}

void FolderModel::setFilterMode(int filterMode)
{
    if (m_filterMode != (FilterMode)filterMode) {
        m_filterMode = (FilterMode)filterMode;

        invalidateFilterIfComplete();

        emit filterModeChanged();
    }
}

QString FolderModel::filterPattern() const
{
    return m_filterPattern;
}

void FolderModel::setFilterPattern(const QString &pattern)
{
    if (m_filterPattern == pattern) {
        return;
    }

    m_filterPattern = pattern;
    m_filterPatternMatchAll = (pattern == QLatin1String("*"));

    const QStringList patterns = pattern.split(QLatin1Char(' '));
    m_regExps.clear();
    m_regExps.reserve(patterns.count());

    foreach (const QString &pattern, patterns) {
        QRegExp rx(pattern);
        rx.setPatternSyntax(QRegExp::Wildcard);
        rx.setCaseSensitivity(Qt::CaseInsensitive);
        m_regExps.append(rx);
    }

    invalidateFilterIfComplete();

    emit filterPatternChanged();
}

QStringList FolderModel::filterMimeTypes() const
{
    return m_mimeSet.toList();
}

void FolderModel::setFilterMimeTypes(const QStringList &mimeList)
{
    const QSet<QString> &set = QSet<QString>::fromList(mimeList);

    if (m_mimeSet != set) {

        m_mimeSet = set;

        invalidateFilterIfComplete();

        emit filterMimeTypesChanged();
    }
}

void FolderModel::setScreen(int screen)
{
    if (m_screen == screen)
        return;

    m_screen = screen;
    if (m_usedByContainment && !m_screenMapper->sharedDesktops()) {
        m_screenMapper->addScreen(screen, resolvedUrl());
    }
    emit screenChanged();
}

KFileItem FolderModel::rootItem() const
{
    return m_dirModel->dirLister()->rootItem();
}

void FolderModel::up()
{
    const QUrl &up = KIO::upUrl(resolvedUrl());

    if (up.isValid()) {
        setUrl(up.toString());
    }
}

void FolderModel::cd(int row)
{
    if (row < 0) {
        return;
    }

    const QModelIndex idx = index(row, 0);
    bool isDir = data(idx, IsDirRole).toBool();

    if (isDir) {
        const KFileItem  item = itemForIndex(idx);
        if (m_parseDesktopFiles && item.isDesktopFile()) {
            const KDesktopFile file(item.targetUrl().path());
            if (file.hasLinkType()) {
                setUrl(file.readUrl());
            }
        } else {
            setUrl(item.targetUrl().toString());
        }
    }
}

void FolderModel::run(int row)
{
    if (row < 0) {
        return;
    }

    KFileItem item = itemForIndex(index(row, 0));

    QUrl url(item.targetUrl());

    // FIXME TODO: This can go once we depend on a KIO w/ fe1f50caaf2.
    if (url.scheme().isEmpty()) {
        url.setScheme(QStringLiteral("file"));
    }

    KRun *run = new KRun(url, nullptr);
    // On desktop:/ we want to be able to run .desktop files right away,
    // otherwise ask for security reasons. We also don't use the targetUrl()
    // from above since we don't want the resolved /home/foo/Desktop URL.
    run->setShowScriptExecutionPrompt(item.url().scheme() != QLatin1String("desktop")
                                   || item.url().adjusted(QUrl::RemoveFilename).path() != QLatin1String("/"));
}

void FolderModel::runSelected()
{
    if (!m_selectionModel->hasSelection()) {
        return;
    }

    if (m_selectionModel->selectedIndexes().count() == 1) {
        run(m_selectionModel->selectedIndexes().constFirst().row());
        return;
    }

    KFileItemActions fileItemActions(this);
    KFileItemList items;

    foreach (const QModelIndex &index, m_selectionModel->selectedIndexes()) {
        // Skip over directories.
        if (!index.data(IsDirRole).toBool()) {
            items << itemForIndex(index);
        }
    }

    fileItemActions.runPreferredApplications(items, QString());
}

void FolderModel::rename(int row, const QString& name)
{
    if (row < 0) {
        return;
    }

    QModelIndex idx = index(row, 0);
    m_dirModel->setData(mapToSource(idx), name, Qt::EditRole);
}

int FolderModel::fileExtensionBoundary(int row)
{
    const QModelIndex idx = index(row, 0);
    const QString &name = data(idx, Qt::DisplayRole).toString();

    int boundary = name.length();

    if (data(idx, IsDirRole).toBool()) {
        return boundary;
    }

    QMimeDatabase db;
    const QString &ext = db.suffixForFileName(name);

    if (ext.isEmpty()) {
        boundary = name.lastIndexOf(QLatin1Char('.'));

        if (boundary < 1) {
            boundary = name.length();
        }
    } else {
        boundary -= ext.length() + 1;
    }

    return boundary;
}

bool FolderModel::hasSelection() const
{
    return m_selectionModel->hasSelection();
}

bool FolderModel::isSelected(int row)
{
    if (row < 0) {
        return false;
    }

    return m_selectionModel->isSelected(index(row, 0));
}

void FolderModel::setSelected(int row)
{
    if (row < 0) {
        return;
    }

    m_selectionModel->select(index(row, 0), QItemSelectionModel::Select);
}

void FolderModel::toggleSelected(int row)
{
    if (row < 0) {
        return;
    }

    m_selectionModel->select(index(row, 0), QItemSelectionModel::Toggle);
}

void FolderModel::setRangeSelected(int anchor, int to)
{
    if (anchor < 0 || to < 0) {
        return;
    }

    QItemSelection selection(index(anchor, 0), index(to, 0));
    m_selectionModel->select(selection, QItemSelectionModel::ClearAndSelect);
}

void FolderModel::updateSelection(const QVariantList &rows, bool toggle)
{
    QItemSelection newSelection;

    int iRow = -1;

    foreach (const QVariant &row, rows) {
        iRow = row.toInt();

        if (iRow < 0) {
            return;
        }

        const QModelIndex &idx = index(iRow, 0);
        newSelection.select(idx, idx);
    }

    if (toggle) {
        QItemSelection pinnedSelection = m_pinnedSelection;
        pinnedSelection.merge(newSelection, QItemSelectionModel::Toggle);
        m_selectionModel->select(pinnedSelection, QItemSelectionModel::ClearAndSelect);
    } else {
        m_selectionModel->select(newSelection, QItemSelectionModel::ClearAndSelect);
    }
}

void FolderModel::clearSelection()
{
    if (m_selectionModel->hasSelection()) {
        m_selectionModel->clear();
    }
}

void FolderModel::pinSelection()
{
    m_pinnedSelection = m_selectionModel->selection();
}

void FolderModel::unpinSelection()
{
    m_pinnedSelection = QItemSelection();
}

void FolderModel::addItemDragImage(int row, int x, int y, int width, int height, const QVariant &image)
{
    if (row < 0) {
        return;
    }

    delete m_dragImages.take(row);

    DragImage *dragImage = new DragImage();
    dragImage->row = row;
    dragImage->rect = QRect(x, y, width, height);
    dragImage->image = image.value<QImage>();
    dragImage->blank = false;

    m_dragImages.insert(row, dragImage);
}

void FolderModel::clearDragImages()
{
    qDeleteAll(m_dragImages);
    m_dragImages.clear();
}

void FolderModel::setDragHotSpotScrollOffset(int x, int y)
{
    m_dragHotSpotScrollOffset.setX(x);
    m_dragHotSpotScrollOffset.setY(y);
}

QPoint FolderModel::dragCursorOffset(int row)
{
    DragImage *image = m_dragImages.value(row);
    if (!image) {
        return QPoint(0, 0);
    }

    return image->cursorOffset;
}

void FolderModel::addDragImage(QDrag *drag, int x, int y)
{
    if (!drag || m_dragImages.isEmpty()) {
        return;
    }

    QRegion region;

    foreach (DragImage *image, m_dragImages) {
        image->blank = isBlank(image->row);
        image->rect.translate(-m_dragHotSpotScrollOffset.x(), -m_dragHotSpotScrollOffset.y());
        if (!image->blank && !image->image.isNull()) {
            region = region.united(image->rect);
        }
    }

    QRect rect = region.boundingRect();
    QPoint offset = rect.topLeft();
    rect.translate(-offset.x(), -offset.y());

    QImage dragImage(rect.size(), QImage::Format_RGBA8888);
    dragImage.fill(Qt::transparent);

    QPainter painter(&dragImage);

    QPoint pos;

    foreach (DragImage *image, m_dragImages) {
        if (!image->blank && !image->image.isNull()) {
            pos = image->rect.translated(-offset.x(), -offset.y()).topLeft();
            image->cursorOffset.setX(pos.x() - (x - offset.x()));
            image->cursorOffset.setY(pos.y() - (y - offset.y()));

            painter.drawImage(pos, image->image);
        }

        // FIXME HACK: Operate on copy.
        image->rect.translate(m_dragHotSpotScrollOffset.x(), m_dragHotSpotScrollOffset.y());
    }

    drag->setPixmap(QPixmap::fromImage(dragImage));
    drag->setHotSpot(QPoint(x - offset.x(), y - offset.y()));
}

void FolderModel::dragSelected(int x, int y)
{
    if (m_dragInProgress) {
        return;
    }

    m_dragInProgress = true;
    emit draggingChanged();
    m_urlChangedWhileDragging = false;

    // Avoid starting a drag synchronously in a mouse handler or interferes with
    // child event filtering in parent items (and thus e.g. press-and-hold hand-
    // ling in a containment).
    QMetaObject::invokeMethod(this, "dragSelectedInternal", Qt::QueuedConnection,
        Q_ARG(int, x),
        Q_ARG(int, y));
}

void FolderModel::dragSelectedInternal(int x, int y)
{
    if (!m_viewAdapter || !m_selectionModel->hasSelection()) {
        m_dragInProgress = false;
        emit draggingChanged();
        return;
    }

    ItemViewAdapter *adapter = qobject_cast<ItemViewAdapter *>(m_viewAdapter);
    QQuickItem *item = qobject_cast<QQuickItem *>(adapter->adapterView());

    QDrag *drag = new QDrag(item);

    addDragImage(drag, x, y);

    m_dragIndexes = m_selectionModel->selectedIndexes();

    qSort(m_dragIndexes.begin(), m_dragIndexes.end());

    // TODO: Optimize to emit contiguous groups.
    emit dataChanged(m_dragIndexes.first(), m_dragIndexes.last(), QVector<int>() << BlankRole);

    QModelIndexList sourceDragIndexes;
    sourceDragIndexes.reserve(m_dragIndexes.count());
    foreach (const QModelIndex &index, m_dragIndexes) {
        sourceDragIndexes.append(mapToSource(index));
    }

    drag->setMimeData(m_dirModel->mimeData(sourceDragIndexes));

    // Due to spring-loading (aka auto-expand), the URL might change
    // while the drag is in-flight - in that case we don't want to
    // unnecessarily emit dataChanged() for (possibly invalid) indices
    // after it ends.
    const QUrl currentUrl(m_dirModel->dirLister()->url());

    item->grabMouse();
    drag->exec(supportedDragActions());

    item->ungrabMouse();

    m_dragInProgress = false;
    emit draggingChanged();
    m_urlChangedWhileDragging = false;

    if (m_dirModel->dirLister()->url() == currentUrl) {
        const QModelIndex first(m_dragIndexes.first());
        const QModelIndex last(m_dragIndexes.last());
        m_dragIndexes.clear();
        // TODO: Optimize to emit contiguous groups.
        emit dataChanged(first, last, QVector<int>() << BlankRole);
    }
}

static bool isDropBetweenSharedViews(const QList<QUrl> &urls, const QUrl &folderUrl)
{
    for (const auto &url : urls) {