katie/src/gui/kernel/qdnd_mac.mm

/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
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** following information to ensure the GNU Lesser General Public License
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** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
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#include "qapplication.h"
#ifndef QT_NO_DRAGANDDROP
#include "qbitmap.h"
#include "qcursor.h"
#include "qevent.h"
#include "qpainter.h"
#include "qurl.h"
#include "qwidget.h"
#include "qfile.h"
#include "qfileinfo.h"
#include <stdlib.h>
#include <string.h>
#ifndef QT_NO_ACCESSIBILITY
# include "qaccessible.h"
#endif

#include <qapplication_p.h>
#include <qwidget_p.h>
#include <qdnd_p.h>
#include <qt_mac_p.h>

QT_BEGIN_NAMESPACE

QT_USE_NAMESPACE

QMacDndAnswerRecord qt_mac_dnd_answer_rec; 

/*****************************************************************************
  QDnD debug facilities
 *****************************************************************************/
//#define DEBUG_DRAG_EVENTS
//#define DEBUG_DRAG_PROMISES

/*****************************************************************************
  QDnD globals
 *****************************************************************************/
bool qt_mac_in_drag = false;
#ifndef QT_MAC_USE_COCOA
static DragReference qt_mac_current_dragRef = 0;
#endif

/*****************************************************************************
  Externals
 *****************************************************************************/
extern void qt_mac_send_modifiers_changed(quint32, QObject *); //qapplication_mac.cpp
extern uint qGlobalPostedEventsCount(); //qapplication.cpp
extern RgnHandle qt_mac_get_rgn(); // qregion_mac.cpp
extern void qt_mac_dispose_rgn(RgnHandle); // qregion_mac.cpp
/*****************************************************************************
  QDnD utility functions
 *****************************************************************************/

//default pixmap
static const int default_pm_hotx = -2;
static const int default_pm_hoty = -16;
#ifndef QT_MAC_USE_COCOA
static const char * const default_pm[] = {
    "13 9 3 1",
    ".      c None",
    "       c #000000",
    "X      c #FFFFFF",
    "X X X X X X X",
    " X X X X X X ",
    "X ......... X",
    " X.........X ",
    "X ......... X",
    " X.........X ",
    "X ......... X",
    " X X X X X X ",
    "X X X X X X X",
};
#endif

//action management
#ifdef DEBUG_DRAG_EVENTS
# define MAP_MAC_ENUM(x) x, #x
#else
# define MAP_MAC_ENUM(x) x
#endif
struct mac_enum_mapper
{
    int mac_code;
    int qt_code;
#ifdef DEBUG_DRAG_EVENTS
    char *qt_desc;
#endif
};
#ifndef QT_MAC_USE_COCOA
static mac_enum_mapper dnd_action_symbols[] = {
    { kDragActionAlias, MAP_MAC_ENUM(Qt::LinkAction) },
    { kDragActionMove, MAP_MAC_ENUM(Qt::MoveAction) },
    { kDragActionGeneric, MAP_MAC_ENUM(Qt::CopyAction) },
    { kDragActionCopy, MAP_MAC_ENUM(Qt::CopyAction) },
    { 0, MAP_MAC_ENUM(0) }
};
static DragActions qt_mac_dnd_map_qt_actions(Qt::DropActions qActions)
{
    DragActions ret = kDragActionNothing;
    for(int i = 0; dnd_action_symbols[i].qt_code; ++i) {
        if(qActions & dnd_action_symbols[i].qt_code)
            ret |= dnd_action_symbols[i].mac_code;
    }
    return ret;
}
static Qt::DropActions qt_mac_dnd_map_mac_actions(DragActions macActions)
{
#ifdef DEBUG_DRAG_EVENTS
    qDebug("Converting DND ActionList: 0x%lx", macActions);
#endif
    Qt::DropActions ret = Qt::IgnoreAction;
    for(int i = 0; dnd_action_symbols[i].qt_code; ++i) {
#ifdef DEBUG_DRAG_EVENTS
        qDebug(" %d) [%s] : %s", i, dnd_action_symbols[i].qt_desc,
                (macActions & dnd_action_symbols[i].mac_code) ? "true" : "false");
#endif
        if(macActions & dnd_action_symbols[i].mac_code)
            ret |= Qt::DropAction(dnd_action_symbols[i].qt_code);
    }
    return ret;
}
static Qt::DropAction qt_mac_dnd_map_mac_default_action(DragActions macActions)
{
    static Qt::DropAction preferred_actions[] = { Qt::CopyAction, Qt::LinkAction, //in order
        Qt::MoveAction, Qt::IgnoreAction };
    Qt::DropAction ret = Qt::IgnoreAction;
    const Qt::DropActions qtActions = qt_mac_dnd_map_mac_actions(macActions);
    for(int i = 0; preferred_actions[i] != Qt::IgnoreAction; ++i) {
        if(qtActions & preferred_actions[i]) {
            ret = preferred_actions[i];
            break;
        }
    }
#ifdef DEBUG_DRAG_EVENTS
    for(int i = 0; dnd_action_symbols[i].qt_code; ++i) {
        if(dnd_action_symbols[i].qt_code == ret) {
            qDebug("Got default action: %s [0x%lx]", dnd_action_symbols[i].qt_desc, macActions);
            break;
        }
    }
#endif
    return ret;
}
static void qt_mac_dnd_update_action(DragReference dragRef) {
    SInt16 modifiers;
    GetDragModifiers(dragRef, &modifiers, 0, 0);
    qt_mac_send_modifiers_changed(modifiers, qApp);

    Qt::DropAction qtAction = Qt::IgnoreAction;
    {
        DragActions macAllowed = kDragActionNothing;
        GetDragDropAction(dragRef, &macAllowed);
        Qt::DropActions qtAllowed = qt_mac_dnd_map_mac_actions(macAllowed);
        qtAction = QDragManager::self()->defaultAction(qtAllowed, QApplication::keyboardModifiers());
#if 1
        if(!(qtAllowed & qtAction))
            qtAction = qt_mac_dnd_map_mac_default_action(macAllowed);
#endif
    }
    DragActions macAction = qt_mac_dnd_map_qt_actions(qtAction);

    DragActions currentActions;
    GetDragDropAction(dragRef, &currentActions);
    if(currentActions != macAction) {
        SetDragDropAction(dragRef, macAction);
        QDragManager::self()->emitActionChanged(qtAction);
    }
}
#endif // !QT_MAC_USE_COCOA

/*****************************************************************************
  DnD functions
 *****************************************************************************/
bool QDropData::hasFormat_sys(const QString &mime) const
{
#ifndef QT_MAC_USE_COCOA
    OSPasteboardRef board;
    if(GetDragPasteboard(qt_mac_current_dragRef, &board) != noErr) {
        qDebug("DnD: Cannot get PasteBoard!");
        return false;
    }
    return QMacPasteboard(board, QMacPasteboardMime::MIME_DND).hasFormat(mime);
#else
    Q_UNUSED(mime);
    return false;
#endif // !QT_MAC_USE_COCOA
}

QVariant QDropData::retrieveData_sys(const QString &mime, QVariant::Type type) const
{
#ifndef QT_MAC_USE_COCOA
    OSPasteboardRef board;
    if(GetDragPasteboard(qt_mac_current_dragRef, &board) != noErr) {
        qDebug("DnD: Cannot get PasteBoard!");
        return QVariant();
    }
    return QMacPasteboard(board, QMacPasteboardMime::MIME_DND).retrieveData(mime, type);
#else
    Q_UNUSED(mime);
    Q_UNUSED(type);
    return QVariant();
#endif // !QT_MAC_USE_COCOA
}

QStringList QDropData::formats_sys() const
{
#ifndef QT_MAC_USE_COCOA
    OSPasteboardRef board;
    if(GetDragPasteboard(qt_mac_current_dragRef, &board) != noErr) {
        qDebug("DnD: Cannot get PasteBoard!");
        return QStringList();
    }
    return QMacPasteboard(board, QMacPasteboardMime::MIME_DND).formats();
#else
    return QStringList();
#endif
}

void QDragManager::timerEvent(QTimerEvent*)
{
}

bool QDragManager::eventFilter(QObject *, QEvent *)
{
    return false;
}

void QDragManager::updateCursor()
{
}

void QDragManager::cancel(bool)
{
    if(object) {
        beingCancelled = true;
        object = 0;
    }
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(this, 0, QAccessible::DragDropEnd);
#endif
}

void QDragManager::move(const QPoint &)
{
}

void QDragManager::drop()
{
}

/**
    If a drop action is already set on the carbon event
    (from e.g. an earlier enter event), we insert the same
    action on the new Qt event that has yet to be sendt.
*/
static inline bool qt_mac_set_existing_drop_action(const DragRef &dragRef, QDropEvent &event)
{
#ifndef QT_MAC_USE_COCOA
    DragActions currentAction = kDragActionNothing;        
    OSStatus err = GetDragDropAction(dragRef, &currentAction);
    if (err == noErr && currentAction != kDragActionNothing) {
        // This looks a bit evil, but we only ever set one action, so it's OK.
        event.setDropAction(Qt::DropAction(int(qt_mac_dnd_map_mac_actions(currentAction))));
        return true;
    }
#else
    Q_UNUSED(dragRef);
    Q_UNUSED(event);
#endif
    return false;
}

/**
    If an answer rect has been set on the event (after being sent
    to the global event processor), we store that rect so we can
    check if the mouse is in the same area upon next drag move event. 
*/
void qt_mac_copy_answer_rect(const QDragMoveEvent &event)
{
    if (!event.answerRect().isEmpty()) {
        qt_mac_dnd_answer_rec.rect = event.answerRect();
        qt_mac_dnd_answer_rec.buttons = event.mouseButtons();
        qt_mac_dnd_answer_rec.modifiers = event.keyboardModifiers();
        qt_mac_dnd_answer_rec.lastAction = event.dropAction();
    }    
}

bool qt_mac_mouse_inside_answer_rect(QPoint mouse)
{
    if (!qt_mac_dnd_answer_rec.rect.isEmpty()
            && qt_mac_dnd_answer_rec.rect.contains(mouse)
            && QApplication::mouseButtons() == qt_mac_dnd_answer_rec.buttons
            && QApplication::keyboardModifiers() == qt_mac_dnd_answer_rec.modifiers)
        return true;
    else
        return false;
}

bool QWidgetPrivate::qt_mac_dnd_event(uint kind, DragRef dragRef)
{
#ifndef QT_MAC_USE_COCOA
    Q_Q(QWidget);
    qt_mac_current_dragRef = dragRef;
    if (kind != kEventControlDragLeave)
        qt_mac_dnd_update_action(dragRef);

    Point mouse;
    GetDragMouse(dragRef, &mouse, 0L);
    if(!mouse.h && !mouse.v)
        GetGlobalMouse(&mouse);

    if(QApplicationPrivate::modalState()) {
        for(QWidget *modal = q; modal; modal = modal->parentWidget()) {
            if(modal->isWindow()) {
                if(modal != QApplication::activeModalWidget())
                    return noErr;
                break;
            }
        }
    }

    //lookup the possible actions
    DragActions allowed = kDragActionNothing;
    GetDragAllowableActions(dragRef, &allowed);
    Qt::DropActions qtAllowed = qt_mac_dnd_map_mac_actions(allowed);

    //lookup the source dragAccepted 
    QMimeData *dropdata = QDragManager::self()->dropData;
    if(QDragManager::self()->source())
        dropdata = QDragManager::self()->dragPrivate()->data;

    // 'interrestedInDrag' should end up being 'true' if a later drop
    // will be accepted by the widget for the current mouse position 
    bool interrestedInDrag = true;

    //Dispatch events
    if (kind == kEventControlDragWithin) {
        if (qt_mac_mouse_inside_answer_rect(q->mapFromGlobal(QPoint(mouse.h, mouse.v))))
            return qt_mac_dnd_answer_rec.lastAction == Qt::IgnoreAction;
        else
            qt_mac_dnd_answer_rec.clear();
        
        QDragMoveEvent qDMEvent(q->mapFromGlobal(QPoint(mouse.h, mouse.v)), qtAllowed, dropdata,
                QApplication::mouseButtons(), QApplication::keyboardModifiers());
                
        // Accept the event by default if a
        // drag action exists on the carbon event
        if (qt_mac_set_existing_drop_action(dragRef, qDMEvent))
            qDMEvent.accept();
            
        QApplication::sendEvent(q, &qDMEvent);
        if (!qDMEvent.isAccepted() || qDMEvent.dropAction() == Qt::IgnoreAction)
            interrestedInDrag = false;

        qt_mac_copy_answer_rect(qDMEvent);
        SetDragDropAction(dragRef, qt_mac_dnd_map_qt_actions(qDMEvent.dropAction()));
        
    } else if (kind == kEventControlDragEnter) {
        qt_mac_dnd_answer_rec.clear();
        
        QDragEnterEvent qDEEvent(q->mapFromGlobal(QPoint(mouse.h, mouse.v)), qtAllowed, dropdata,
                QApplication::mouseButtons(), QApplication::keyboardModifiers());
        qt_mac_set_existing_drop_action(dragRef, qDEEvent);                         
        QApplication::sendEvent(q, &qDEEvent);
        SetDragDropAction(dragRef, qt_mac_dnd_map_qt_actions(qDEEvent.dropAction()));
        
        if (!qDEEvent.isAccepted())
            // The widget is simply not interested in this
            // drag. So tell carbon this by returning 'false'. We will then
            // not receive any further move, drop or leave events for this widget.
            return false;
        else {
            // Documentation states that a drag move event is sent immediately after
            // a drag enter event. So we do that. This will honor widgets overriding
            // 'dragMoveEvent' only, and not 'dragEnterEvent' 
            QDragMoveEvent qDMEvent(q->mapFromGlobal(QPoint(mouse.h, mouse.v)), qtAllowed, dropdata,
                    QApplication::mouseButtons(), QApplication::keyboardModifiers());
            qDMEvent.accept(); // accept by default, since enter event was accepted.
            qDMEvent.setDropAction(qDEEvent.dropAction());         
            QApplication::sendEvent(q, &qDMEvent);
            if (!qDMEvent.isAccepted() || qDMEvent.dropAction() == Qt::IgnoreAction)
                interrestedInDrag = false;
            
            qt_mac_copy_answer_rect(qDMEvent);           
            SetDragDropAction(dragRef, qt_mac_dnd_map_qt_actions(qDMEvent.dropAction()));
        }
        
    } else if(kind == kEventControlDragLeave) {
        QDragLeaveEvent de;
        QApplication::sendEvent(q, &de);
    } else if(kind == kEventControlDragReceive) {
        QDropEvent de(q->mapFromGlobal(QPoint(mouse.h, mouse.v)), qtAllowed, dropdata,
                      QApplication::mouseButtons(), QApplication::keyboardModifiers());
        if(QDragManager::self()->object)
            QDragManager::self()->dragPrivate()->target = q;
        QApplication::sendEvent(q, &de);
        if(!de.isAccepted()) {
            interrestedInDrag = false;
            SetDragDropAction(dragRef, kDragActionNothing);
        } else {
            if(QDragManager::self()->object)
                QDragManager::self()->dragPrivate()->executed_action = de.dropAction();
            SetDragDropAction(dragRef, qt_mac_dnd_map_qt_actions(de.dropAction()));
        }
    }

#ifdef DEBUG_DRAG_EVENTS
    {
        const char *desc = 0;
        switch(kind) {
        case kEventControlDragWithin: desc = "DragMove"; break;
        case kEventControlDragEnter: desc = "DragEnter"; break;
        case kEventControlDragLeave: desc = "DragLeave"; break;
        case kEventControlDragReceive: desc = "DragDrop"; break;
        }
        if(desc) {
            QPoint pos(q->mapFromGlobal(QPoint(mouse.h, mouse.v)));
            qDebug("Sending <%s>(%d, %d) event to %p(%s::%s) [%d] (%p)",
                   desc, pos.x(), pos.y(), q, q->metaObject()->className(),
                   q->objectName().toLocal8Bit().constData(), ret, dragRef);
        }
    }
#endif

    //set the cursor
    bool found_cursor = false;
    if(kind == kEventControlDragWithin || kind == kEventControlDragEnter) {
        ThemeCursor cursor = kThemeNotAllowedCursor;
        found_cursor = true;
        if (interrestedInDrag) {
            DragActions action = kDragActionNothing;
            GetDragDropAction(dragRef, &action);
            switch(qt_mac_dnd_map_mac_default_action(action)) {
            case Qt::IgnoreAction:
                cursor = kThemeNotAllowedCursor;
                break;
            case Qt::MoveAction:
                cursor = kThemeArrowCursor;
                break;
            case Qt::CopyAction:
                cursor = kThemeCopyArrowCursor;
                break;
            case Qt::LinkAction:
                cursor = kThemeAliasArrowCursor;
                break;
            default:
                cursor = kThemeNotAllowedCursor;
                break;
            }
        }
        SetThemeCursor(cursor);
    }
    if(found_cursor) {
        qt_mac_set_cursor(0); //just use our's
    } else {
        QCursor cursor(Qt::ArrowCursor);
        if(qApp && qApp->overrideCursor()) {
            cursor = *qApp->overrideCursor();
        } else if(q) {
            for(QWidget *p = q; p; p = p->parentWidget()) {
                if(p->isEnabled() && p->testAttribute(Qt::WA_SetCursor)) {
                    cursor = p->cursor();
                    break;
                }
            }
        }
        qt_mac_set_cursor(&cursor);
    }

    //idle things
    if(qGlobalPostedEventsCount()) {
        QApplication::sendPostedEvents();
        QApplication::flush();
    }
    
    // If this was not a drop, tell carbon that we will be interresed in receiving more
    // events for the current drag. We do that by returning true. 
    if (kind == kEventControlDragReceive)
        return interrestedInDrag;
    else
        return true;
#else
    Q_UNUSED(kind);
    Q_UNUSED(dragRef);
    return false;
#endif // !QT_MAC_USE_COCOA
}

#ifndef QT_MAC_USE_COCOA
Qt::DropAction QDragManager::drag(QDrag *o)
{
  
    if(qt_mac_in_drag) {     //just make sure..
        qWarning("Qt: Internal error: WH0A, unexpected condition reached");
        return Qt::IgnoreAction;
    }
    if(object == o)
        return Qt::IgnoreAction;
    /* At the moment it seems clear that Mac OS X does not want to drag with a non-left button
       so we just bail early to prevent it */
    if(!(GetCurrentEventButtonState() & kEventMouseButtonPrimary))
        return Qt::IgnoreAction;

    if(object) {
        dragPrivate()->source->removeEventFilter(this);
        cancel();
        beingCancelled = false;
    }

    object = o;
    dragPrivate()->target = 0;

#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(this, 0, QAccessible::DragDropStart);
#endif

    //setup the data
    QMacPasteboard dragBoard(QMacPasteboardMime::MIME_DND);
    dragBoard.setMimeData(dragPrivate()->data);

    //create the drag
    OSErr result;
    DragRef dragRef;
    if((result = NewDragWithPasteboard(dragBoard.pasteBoard(), &dragRef)))
        return Qt::IgnoreAction;
    //setup the actions
    DragActions possibleActions = qt_mac_dnd_map_qt_actions(dragPrivate()->possible_actions);
    SetDragAllowableActions(dragRef, //local
                            possibleActions,
                            true);
    SetDragAllowableActions(dragRef, //remote (same as local)
                            possibleActions,
                            false);


    QPoint hotspot;
    QPixmap pix = dragPrivate()->pixmap;
    if(pix.isNull()) {
        if(dragPrivate()->data->hasText() || dragPrivate()->data->hasUrls()) {
            //get the string
            QString s = dragPrivate()->data->hasText() ? dragPrivate()->data->text()
                                                : dragPrivate()->data->urls().first().toString();
            if(s.length() > 26)
                s = s.left(23) + QChar(0x2026);
            if(!s.isEmpty()) {
                //draw it
                QFont f(qApp->font());
                f.setPointSize(12);
                QFontMetrics fm(f);
                const int width = fm.width(s);
                const int height = fm.height();
                if(width > 0 && height > 0) {
                    QPixmap tmp(width, height);
                    QPainter p(&tmp);
                    p.fillRect(0, 0, tmp.width(), tmp.height(), Qt::color0);
                    p.setPen(Qt::color1);
                    p.setFont(f);
                    p.drawText(0, fm.ascent(), s);
                    p.end();
                    //save it
                    pix = tmp;
                    hotspot = QPoint(tmp.width() / 2, tmp.height() / 2);
                }
            }
        } else {
            pix = QPixmap(default_pm);
            hotspot = QPoint(default_pm_hotx, default_pm_hoty);
        }
    } else {
        hotspot = dragPrivate()->hotspot;
    }

    //so we must fake an event
    EventRecord fakeEvent;
    GetGlobalMouse(&(fakeEvent.where));
    fakeEvent.message = 0;
    fakeEvent.what = mouseDown;
    fakeEvent.when = EventTimeToTicks(GetCurrentEventTime());
    fakeEvent.modifiers = GetCurrentKeyModifiers();
    if(GetCurrentEventButtonState() & 2)
        fakeEvent.modifiers |= controlKey;

    //find the hotspot in relation to the pixmap
    Point boundsPoint;
    boundsPoint.h = fakeEvent.where.h - hotspot.x();
    boundsPoint.v = fakeEvent.where.v - hotspot.y();
    Rect boundsRect;
    SetRect(&boundsRect, boundsPoint.h, boundsPoint.v, boundsPoint.h + pix.width(), boundsPoint.v + pix.height());

    //set the drag image
    QRegion dragRegion(boundsPoint.h, boundsPoint.v, pix.width(), pix.height()), pixRegion;
    if(!pix.isNull()) {
        HIPoint hipoint = { -hotspot.x(), -hotspot.y() };
        CGImageRef img = (CGImageRef)pix.macCGHandle();
        SetDragImageWithCGImage(dragRef, img, &hipoint, 0);
        CGImageRelease(img);
    }

    SetDragItemBounds(dragRef, (ItemReference)1 , &boundsRect);
    { //do the drag
        qt_mac_in_drag = true;
        qt_mac_dnd_update_action(dragRef);
        result = TrackDrag(dragRef, &fakeEvent, QMacSmartQuickDrawRegion(dragRegion.toQDRgn()));
        qt_mac_in_drag = false;
    }
    object = 0;
    if(result == noErr) {
        // Check if the receiver points us to
        // a file location. If so, we need to do
        // the file copy/move ourselves:
        QCFType<CFURLRef> pasteLocation = 0;
        PasteboardCopyPasteLocation(dragBoard.pasteBoard(), &pasteLocation);
        if (pasteLocation){
            Qt::DropAction action = o->d_func()->defaultDropAction;
            if (action == Qt::IgnoreAction){
                if (o->d_func()->possible_actions & Qt::MoveAction)
                    action = Qt::MoveAction;
                else if (o->d_func()->possible_actions & Qt::CopyAction)
                    action = Qt::CopyAction;
                
            }
            bool atleastOne = false;
            QList<QUrl> urls = o->mimeData()->urls();
            for (int i = 0; i < urls.size(); ++i){
                QUrl fromUrl = urls.at(i);
                QString filename = QFileInfo(fromUrl.path()).fileName();
                QUrl toUrl(QCFString::toQString(CFURLGetString(pasteLocation)) + filename);
                if (action == Qt::MoveAction){
                    if (QFile::rename(fromUrl.path(), toUrl.path()))
                        atleastOne = true;
                } else if (action == Qt::CopyAction){
                    if (QFile::copy(fromUrl.path(), toUrl.path()))
                        atleastOne = true;
                }
            }
            if (atleastOne){
                DisposeDrag(dragRef);
                o->setMimeData(0);
                o->deleteLater();
                return action;
            }
        }

        DragActions ret = kDragActionNothing;
        GetDragDropAction(dragRef, &ret);
        DisposeDrag(dragRef); //cleanup
        o->setMimeData(0);
        o->deleteLater();
        return qt_mac_dnd_map_mac_default_action(ret);
    }
    DisposeDrag(dragRef); //cleanup
    return Qt::IgnoreAction;
}
#endif

void QDragManager::updatePixmap()
{
}

QCocoaDropData::QCocoaDropData(CFStringRef pasteboard)
    : QInternalMimeData()
{
    NSString* pasteboardName = (NSString*)pasteboard;
    [pasteboardName retain];
    dropPasteboard = pasteboard;
}

QCocoaDropData::~QCocoaDropData()
{
    NSString* pasteboardName = (NSString*)dropPasteboard;
    [pasteboardName release];
}

QStringList QCocoaDropData::formats_sys() const
{
    QStringList formats; 
    OSPasteboardRef board;
    if (PasteboardCreate(dropPasteboard, &board) != noErr) {
        qDebug("DnD: Cannot get PasteBoard!");
        return formats;
    }
    formats = QMacPasteboard(board, QMacPasteboardMime::MIME_DND).formats();
    return formats;
}

QVariant QCocoaDropData::retrieveData_sys(const QString &mimeType, QVariant::Type type) const
{
    QVariant data;
    OSPasteboardRef board;
    if (PasteboardCreate(dropPasteboard, &board) != noErr) {
        qDebug("DnD: Cannot get PasteBoard!");
        return data;
    }
    data = QMacPasteboard(board, QMacPasteboardMime::MIME_DND).retrieveData(mimeType, type);
    CFRelease(board);
    return data;
}

bool QCocoaDropData::hasFormat_sys(const QString &mimeType) const
{
    bool has = false;
    OSPasteboardRef board;
    if (PasteboardCreate(dropPasteboard, &board) != noErr) {
        qDebug("DnD: Cannot get PasteBoard!");
        return has;
    }
    has = QMacPasteboard(board, QMacPasteboardMime::MIME_DND).hasFormat(mimeType);
    CFRelease(board);
    return has;
}

#endif // QT_NO_DRAGANDDROP
QT_END_NAMESPACE