Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4157 insertions, 0 deletions

diff --git a/vcl/unx/generic/dtrans/X11_selection.cxx b/vcl/unx/generic/dtrans/X11_selection.cxx
new file mode 100644
index 000000000..3e15173ba
--- /dev/null
+++ b/vcl/unx/generic/dtrans/X11_selection.cxx
@@ -0,0 +1,4157 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+
+#include <cstdlib>
+
+#include <unx/saldisp.hxx>
+
+#include <unistd.h>
+#include <string.h>
+#include <sys/time.h>
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/XKBlib.h>
+#include <X11/Xatom.h>
+#include <X11/keysym.h>
+
+#if defined(NETBSD) || defined (FREEBSD) || defined(OPENBSD)
+#include <sys/poll.h>
+#else
+#include <poll.h>
+#endif
+
+#include <sal/macros.h>
+
+#include "X11_selection.hxx"
+#include "X11_clipboard.hxx"
+#include "X11_transferable.hxx"
+#include "X11_dndcontext.hxx"
+#include "bmp.hxx"
+
+#include <vcl/svapp.hxx>
+
+// pointer bitmaps
+#include "copydata_curs.h"
+#include "copydata_mask.h"
+#include "movedata_curs.h"
+#include "movedata_mask.h"
+#include "linkdata_curs.h"
+#include "linkdata_mask.h"
+#include "nodrop_curs.h"
+#include "nodrop_mask.h"
+#include <com/sun/star/datatransfer/dnd/DNDConstants.hpp>
+#include <com/sun/star/awt/MouseEvent.hpp>
+#include <com/sun/star/awt/MouseButton.hpp>
+#include <com/sun/star/frame/Desktop.hpp>
+#include <rtl/tencinfo.h>
+#include <rtl/ustrbuf.hxx>
+
+#include <comphelper/processfactory.hxx>
+#include <comphelper/solarmutex.hxx>
+
+#include <cppuhelper/supportsservice.hxx>
+#include <algorithm>
+
+static constexpr auto DRAG_EVENT_MASK = ButtonPressMask |
+                              ButtonReleaseMask |
+                              PointerMotionMask |
+                              EnterWindowMask |
+                              LeaveWindowMask;
+
+using namespace com::sun::star::datatransfer;
+using namespace com::sun::star::datatransfer::dnd;
+using namespace com::sun::star::lang;
+using namespace com::sun::star::awt;
+using namespace com::sun::star::uno;
+using namespace com::sun::star::frame;
+using namespace cppu;
+
+using namespace x11;
+
+// stubs to satisfy solaris compiler's rather rigid linking warning
+extern "C"
+{
+    static void call_SelectionManager_run( void * pMgr )
+    {
+        SelectionManager::run( pMgr );
+    }
+
+    static void call_SelectionManager_runDragExecute( void * pMgr )
+    {
+        osl_setThreadName("SelectionManager::runDragExecute()");
+        SelectionManager::runDragExecute( pMgr );
+    }
+}
+
+static const long nXdndProtocolRevision = 5;
+
+namespace {
+
+// mapping between mime types (or what the office thinks of mime types)
+// and X convention types
+struct NativeTypeEntry
+{
+    Atom            nAtom;
+    const char*     pType;              // Mime encoding on our side
+    const char*     pNativeType;        // string corresponding to nAtom for the case of nAtom being uninitialized
+    int             nFormat;            // the corresponding format
+};
+
+}
+
+// the convention for Xdnd is mime types as specified by the corresponding
+// RFC's with the addition that text/plain without charset tag contains iso8859-1
+// sadly some applications (e.g. gtk) do not honor the mimetype only rule,
+// so for compatibility add UTF8_STRING
+static NativeTypeEntry aXdndConversionTab[] =
+{
+    { 0, "text/plain;charset=iso8859-1", "text/plain", 8 },
+    { 0, "text/plain;charset=utf-8", "UTF8_STRING", 8 }
+};
+
+// for clipboard and primary selections there is only a convention for text
+// that the encoding name of the text is taken as type in all capitalized letters
+static NativeTypeEntry aNativeConversionTab[] =
+{
+    { 0, "text/plain;charset=utf-16", "ISO10646-1", 16 },
+    { 0, "text/plain;charset=utf-8", "UTF8_STRING", 8 },
+    { 0, "text/plain;charset=utf-8", "UTF-8", 8 },
+    { 0, "text/plain;charset=utf-8", "text/plain;charset=UTF-8", 8 },
+    // ISO encodings
+    { 0, "text/plain;charset=iso8859-2", "ISO8859-2", 8 },
+    { 0, "text/plain;charset=iso8859-3", "ISO8859-3", 8 },
+    { 0, "text/plain;charset=iso8859-4", "ISO8859-4", 8 },
+    { 0, "text/plain;charset=iso8859-5", "ISO8859-5", 8 },
+    { 0, "text/plain;charset=iso8859-6", "ISO8859-6", 8 },
+    { 0, "text/plain;charset=iso8859-7", "ISO8859-7", 8 },
+    { 0, "text/plain;charset=iso8859-8", "ISO8859-8", 8 },
+    { 0, "text/plain;charset=iso8859-9", "ISO8859-9", 8 },
+    { 0, "text/plain;charset=iso8859-10", "ISO8859-10", 8 },
+    { 0, "text/plain;charset=iso8859-13", "ISO8859-13", 8 },
+    { 0, "text/plain;charset=iso8859-14", "ISO8859-14", 8 },
+    { 0, "text/plain;charset=iso8859-15", "ISO8859-15", 8 },
+    // asian encodings
+    { 0, "text/plain;charset=jisx0201.1976-0", "JISX0201.1976-0", 8 },
+    { 0, "text/plain;charset=jisx0208.1983-0", "JISX0208.1983-0", 8 },
+    { 0, "text/plain;charset=jisx0208.1990-0", "JISX0208.1990-0", 8 },
+    { 0, "text/plain;charset=jisx0212.1990-0", "JISX0212.1990-0", 8 },
+    { 0, "text/plain;charset=gb2312.1980-0", "GB2312.1980-0", 8 },
+    { 0, "text/plain;charset=ksc5601.1992-0", "KSC5601.1992-0", 8 },
+    // eastern european encodings
+    { 0, "text/plain;charset=koi8-r", "KOI8-R", 8 },
+    { 0, "text/plain;charset=koi8-u", "KOI8-U", 8 },
+    // String (== iso8859-1)
+    { XA_STRING, "text/plain;charset=iso8859-1", "STRING", 8 },
+    // special for compound text
+    { 0, "text/plain;charset=compound_text", "COMPOUND_TEXT", 8 },
+
+    // PIXMAP
+    { XA_PIXMAP, "image/bmp", "PIXMAP", 32 }
+};
+
+rtl_TextEncoding x11::getTextPlainEncoding( const OUString& rMimeType )
+{
+    rtl_TextEncoding aEncoding = RTL_TEXTENCODING_DONTKNOW;
+    OUString aMimeType( rMimeType.toAsciiLowerCase() );
+    sal_Int32 nIndex = 0;
+    if( aMimeType.getToken( 0, ';', nIndex ) == "text/plain" )
+    {
+        if( aMimeType.getLength() == 10 ) // only "text/plain"
+            aEncoding = RTL_TEXTENCODING_ISO_8859_1;
+        else
+        {
+            while( nIndex != -1 )
+            {
+                OUString aToken = aMimeType.getToken( 0, ';', nIndex );
+                sal_Int32 nPos = 0;
+                if( aToken.getToken( 0, '=', nPos ) == "charset" )
+                {
+                    OString aEncToken = OUStringToOString( aToken.getToken( 0, '=', nPos ), RTL_TEXTENCODING_ISO_8859_1 );
+                    aEncoding = rtl_getTextEncodingFromUnixCharset( aEncToken.getStr() );
+                    if( aEncoding == RTL_TEXTENCODING_DONTKNOW )
+                    {
+                        if( aEncToken.equalsIgnoreAsciiCase( "utf-8" ) )
+                            aEncoding = RTL_TEXTENCODING_UTF8;
+                    }
+                    if( aEncoding != RTL_TEXTENCODING_DONTKNOW )
+                        break;
+                }
+            }
+        }
+    }
+#if OSL_DEBUG_LEVEL > 1
+    SAL_WARN_IF(aEncoding == RTL_TEXTENCODING_DONTKNOW,
+            "vcl.unx.dtrans", "getTextPlainEncoding( "
+            << rMimeType << " ) failed.");
+#endif
+    return aEncoding;
+}
+
+std::unordered_map< OUString, SelectionManager* >& SelectionManager::getInstances()
+{
+    static std::unordered_map< OUString, SelectionManager* > aInstances;
+    return aInstances;
+}
+
+SelectionManager::SelectionManager() :
+        m_nIncrementalThreshold( 15*1024 ),
+        m_pDisplay( nullptr ),
+        m_aThread( nullptr ),
+        m_aDragExecuteThread( nullptr ),
+        m_aWindow( None ),
+        m_nSelectionTimeout( 0 ),
+        m_nSelectionTimestamp( CurrentTime ),
+        m_bDropEnterSent( true ),
+        m_aCurrentDropWindow( None ),
+        m_nDropTime( None ),
+        m_nLastDropAction( 0 ),
+        m_nLastX( 0 ),
+        m_nLastY( 0 ),
+        m_bDropWaitingForCompletion( false ),
+        m_aDropWindow( None ),
+        m_aDropProxy( None ),
+        m_aDragSourceWindow( None ),
+        m_nLastDragX( 0 ),
+        m_nLastDragY( 0 ),
+        m_nNoPosX( 0 ),
+        m_nNoPosY( 0 ),
+        m_nNoPosWidth( 0 ),
+        m_nNoPosHeight( 0 ),
+        m_nDragButton( 0 ),
+        m_nUserDragAction( 0 ),
+        m_nTargetAcceptAction( 0 ),
+        m_nSourceActions( 0 ),
+        m_bLastDropAccepted( false ),
+        m_bDropSuccess( false ),
+        m_bDropSent( false ),
+        m_nDropTimeout( 0 ),
+        m_bWaitingForPrimaryConversion( false ),
+        m_aMoveCursor( None ),
+        m_aCopyCursor( None ),
+        m_aLinkCursor( None ),
+        m_aNoneCursor( None ),
+        m_aCurrentCursor( None ),
+        m_nCurrentProtocolVersion( nXdndProtocolRevision ),
+        m_nTARGETSAtom( None ),
+        m_nTIMESTAMPAtom( None ),
+        m_nTEXTAtom( None ),
+        m_nINCRAtom( None ),
+        m_nCOMPOUNDAtom( None ),
+        m_nMULTIPLEAtom( None ),
+        m_nImageBmpAtom( None ),
+        m_nXdndAware( None ),
+        m_nXdndEnter( None ),
+        m_nXdndLeave( None ),
+        m_nXdndPosition( None ),
+        m_nXdndStatus( None ),
+        m_nXdndDrop( None ),
+        m_nXdndFinished( None ),
+        m_nXdndSelection( None ),
+        m_nXdndTypeList( None ),
+        m_nXdndProxy( None ),
+        m_nXdndActionCopy( None ),
+        m_nXdndActionMove( None ),
+        m_nXdndActionLink( None ),
+        m_nXdndActionAsk( None ),
+        m_bShutDown( false )
+{
+    memset(&m_aDropEnterEvent, 0, sizeof(m_aDropEnterEvent));
+    m_EndThreadPipe[0] = 0;
+    m_EndThreadPipe[1] = 0;
+    m_aDragRunning.reset();
+}
+
+Cursor SelectionManager::createCursor( const unsigned char* pPointerData, const unsigned char* pMaskData, int width, int height, int hotX, int hotY )
+{
+    Pixmap aPointer;
+    Pixmap aMask;
+    XColor aBlack, aWhite;
+
+    aBlack.pixel = BlackPixel( m_pDisplay, 0 );
+    aBlack.red = aBlack.green = aBlack.blue = 0;
+    aBlack.flags = DoRed | DoGreen | DoBlue;
+
+    aWhite.pixel = WhitePixel( m_pDisplay, 0 );
+    aWhite.red = aWhite.green = aWhite.blue = 0xffff;
+    aWhite.flags = DoRed | DoGreen | DoBlue;
+
+    aPointer =
+        XCreateBitmapFromData( m_pDisplay,
+                               m_aWindow,
+                               reinterpret_cast<const char*>(pPointerData),
+                               width,
+                               height );
+    aMask
+        = XCreateBitmapFromData( m_pDisplay,
+                                 m_aWindow,
+                                 reinterpret_cast<const char*>(pMaskData),
+                                 width,
+                                 height );
+    Cursor aCursor =
+        XCreatePixmapCursor( m_pDisplay, aPointer, aMask,
+                             &aBlack, &aWhite,
+                             hotX,
+                             hotY );
+    XFreePixmap( m_pDisplay, aPointer );
+    XFreePixmap( m_pDisplay, aMask );
+
+    return aCursor;
+}
+
+void SelectionManager::initialize( const Sequence< Any >& arguments )
+{
+    osl::MutexGuard aGuard(m_aMutex);
+
+    if( ! m_xDisplayConnection.is() )
+    {
+        /*
+         *  first argument must be a css::awt::XDisplayConnection
+         *  from this we will get the XEvents of the vcl event loop by
+         *  registering us as XEventHandler on it.
+         *
+         *  implementor's note:
+         *  FIXME:
+         *  finally the clipboard and XDND service is back in the module it belongs
+         *  now cleanup and sharing of resources with the normal vcl event loop
+         *  needs to be added. The display used would be that of the normal event loop
+         *  and synchronization should be done via the SolarMutex.
+         */
+        if( arguments.hasElements() )
+            arguments.getConstArray()[0] >>= m_xDisplayConnection;
+        if( ! m_xDisplayConnection.is() )
+        {
+        }
+        else
+            m_xDisplayConnection->addEventHandler( Any(), this, ~0 );
+    }
+
+    if( ! m_pDisplay )
+    {
+        OUString aUDisplay;
+        if( m_xDisplayConnection.is() )
+        {
+            Any aIdentifier = m_xDisplayConnection->getIdentifier();
+            aIdentifier >>= aUDisplay;
+        }
+
+        OString aDisplayName( OUStringToOString( aUDisplay, RTL_TEXTENCODING_ISO_8859_1 ) );
+
+        m_pDisplay = XOpenDisplay( aDisplayName.isEmpty() ? nullptr : aDisplayName.getStr());
+
+        if( m_pDisplay )
+        {
+#ifdef SYNCHRONIZE
+            XSynchronize( m_pDisplay, True );
+#endif
+            // special targets
+            m_nTARGETSAtom      = getAtom( "TARGETS" );
+            m_nTIMESTAMPAtom    = getAtom( "TIMESTAMP" );
+            m_nTEXTAtom         = getAtom( "TEXT" );
+            m_nINCRAtom         = getAtom( "INCR" );
+            m_nCOMPOUNDAtom     = getAtom( "COMPOUND_TEXT" );
+            m_nMULTIPLEAtom     = getAtom( "MULTIPLE" );
+            m_nImageBmpAtom     = getAtom( "image/bmp" );
+
+            // Atoms for Xdnd protocol
+            m_nXdndAware        = getAtom( "XdndAware" );
+            m_nXdndEnter        = getAtom( "XdndEnter" );
+            m_nXdndLeave        = getAtom( "XdndLeave" );
+            m_nXdndPosition     = getAtom( "XdndPosition" );
+            m_nXdndStatus       = getAtom( "XdndStatus" );
+            m_nXdndDrop         = getAtom( "XdndDrop" );
+            m_nXdndFinished     = getAtom( "XdndFinished" );
+            m_nXdndSelection    = getAtom( "XdndSelection" );
+            m_nXdndTypeList     = getAtom( "XdndTypeList" );
+            m_nXdndProxy        = getAtom( "XdndProxy" );
+            m_nXdndActionCopy   = getAtom( "XdndActionCopy" );
+            m_nXdndActionMove   = getAtom( "XdndActionMove" );
+            m_nXdndActionLink   = getAtom( "XdndActionLink" );
+            m_nXdndActionAsk    = getAtom( "XdndActionAsk" );
+
+            // initialize map with member none
+            m_aAtomToString[ 0 ]= "None";
+            m_aAtomToString[ XA_PRIMARY ] = "PRIMARY";
+
+            // create a (invisible) message window
+            m_aWindow = XCreateSimpleWindow( m_pDisplay, DefaultRootWindow( m_pDisplay ),
+                                             10, 10, 10, 10, 0, 0, 1 );
+
+            // initialize threshold for incremental transfers
+            // ICCCM says it should be smaller that the max request size
+            // which in turn is guaranteed to be at least 16k bytes
+            m_nIncrementalThreshold = XMaxRequestSize( m_pDisplay ) - 1024;
+
+            if( m_aWindow )
+            {
+                // initialize default cursors
+                m_aMoveCursor = createCursor( movedata_curs_bits,
+                                              movedata_mask_bits,
+                                              movedata_curs_width,
+                                              movedata_curs_height,
+                                              movedata_curs_x_hot,
+                                              movedata_curs_y_hot );
+                m_aCopyCursor = createCursor( copydata_curs_bits,
+                                              copydata_mask_bits,
+                                              copydata_curs_width,
+                                              copydata_curs_height,
+                                              copydata_curs_x_hot,
+                                              copydata_curs_y_hot );
+                m_aLinkCursor = createCursor( linkdata_curs_bits,
+                                              linkdata_mask_bits,
+                                              linkdata_curs_width,
+                                              linkdata_curs_height,
+                                              linkdata_curs_x_hot,
+                                              linkdata_curs_y_hot );
+                m_aNoneCursor = createCursor( nodrop_curs_bits,
+                                              nodrop_mask_bits,
+                                              nodrop_curs_width,
+                                              nodrop_curs_height,
+                                              nodrop_curs_x_hot,
+                                              nodrop_curs_y_hot );
+
+                // just interested in SelectionClear/Notify/Request and PropertyChange
+                XSelectInput( m_pDisplay, m_aWindow, PropertyChangeMask );
+                // create the transferable for Drag operations
+                m_xDropTransferable = new X11Transferable( *this, m_nXdndSelection );
+                registerHandler( m_nXdndSelection, *this );
+
+                m_aThread = osl_createSuspendedThread( call_SelectionManager_run, this );
+                if( m_aThread )
+                    osl_resumeThread( m_aThread );
+#if OSL_DEBUG_LEVEL > 1
+                else
+                    SAL_WARN("vcl.unx.dtrans", "SelectionManager::initialize: "
+                            << "creation of dispatch thread failed !.");
+#endif
+
+                if (pipe(m_EndThreadPipe) != 0) {
+#if OSL_DEBUG_LEVEL > 1
+                    SAL_WARN("vcl.unx.dtrans", "Failed to create endThreadPipe.");
+#endif
+                    m_EndThreadPipe[0] = m_EndThreadPipe[1] = 0;
+                }
+            }
+        }
+    }
+}
+
+SelectionManager::~SelectionManager()
+{
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "SelectionManager::~SelectionManager ("
+            << (m_pDisplay ? DisplayString(m_pDisplay) : "no display")
+            << ").");
+#endif
+    {
+        osl::MutexGuard aGuard( *osl::Mutex::getGlobalMutex() );
+
+        auto it = std::find_if(getInstances().begin(), getInstances().end(),
+            [&](const std::pair< OUString, SelectionManager* >& rInstance) { return rInstance.second == this; });
+        if( it != getInstances().end() )
+            getInstances().erase( it );
+    }
+
+    if( m_aThread )
+    {
+        osl_terminateThread( m_aThread );
+        osl_joinWithThread( m_aThread );
+        osl_destroyThread( m_aThread );
+    }
+
+    if( m_aDragExecuteThread )
+    {
+        osl_terminateThread( m_aDragExecuteThread );
+        osl_joinWithThread( m_aDragExecuteThread );
+        m_aDragExecuteThread = nullptr;
+        // thread handle is freed in dragDoDispatch()
+    }
+
+    osl::MutexGuard aGuard(m_aMutex);
+
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "shutting down SelectionManager.");
+#endif
+
+    if( m_pDisplay )
+    {
+        deregisterHandler( m_nXdndSelection );
+        // destroy message window
+        if( m_aWindow )
+            XDestroyWindow( m_pDisplay, m_aWindow );
+        // release cursors
+        if (m_aMoveCursor != None)
+            XFreeCursor(m_pDisplay, m_aMoveCursor);
+        if (m_aCopyCursor != None)
+            XFreeCursor(m_pDisplay, m_aCopyCursor);
+        if (m_aLinkCursor != None)
+            XFreeCursor(m_pDisplay, m_aLinkCursor);
+        if (m_aNoneCursor != None)
+            XFreeCursor(m_pDisplay, m_aNoneCursor);
+
+        // paranoia setting, the drag thread should have
+        // done that already
+        XUngrabPointer( m_pDisplay, CurrentTime );
+        XUngrabKeyboard( m_pDisplay, CurrentTime );
+
+        XCloseDisplay( m_pDisplay );
+    }
+}
+
+SelectionAdaptor* SelectionManager::getAdaptor( Atom selection )
+{
+    std::unordered_map< Atom, Selection* >::iterator it =
+          m_aSelections.find( selection );
+    return it != m_aSelections.end() ? it->second->m_pAdaptor : nullptr;
+}
+
+OUString SelectionManager::convertFromCompound( const char* pText, int nLen )
+{
+    osl::MutexGuard aGuard( m_aMutex );
+    OUStringBuffer aRet;
+    if( nLen < 0 )
+        nLen = strlen( pText );
+
+    char** pTextList = nullptr;
+    int nTexts = 0;
+
+    XTextProperty aProp;
+    aProp.value     = reinterpret_cast<unsigned char *>(const_cast<char *>(pText));
+    aProp.encoding  = m_nCOMPOUNDAtom;
+    aProp.format    = 8;
+    aProp.nitems    = nLen;
+    XmbTextPropertyToTextList( m_pDisplay,
+                               &aProp,
+                               &pTextList,
+                               &nTexts );
+    rtl_TextEncoding aEncoding = osl_getThreadTextEncoding();
+    for( int i = 0; i < nTexts; i++ )
+        aRet.append(OStringToOUString( pTextList[i], aEncoding ));
+
+    if( pTextList )
+        XFreeStringList( pTextList );
+
+    return aRet.makeStringAndClear();
+}
+
+OString SelectionManager::convertToCompound( const OUString& rText )
+{
+    osl::MutexGuard aGuard( m_aMutex );
+    XTextProperty aProp;
+    aProp.value = nullptr;
+    aProp.encoding = XA_STRING;
+    aProp.format = 8;
+    aProp.nitems = 0;
+
+    OString aRet( rText.getStr(), rText.getLength(), osl_getThreadTextEncoding() );
+    char* pT = const_cast<char*>(aRet.getStr());
+
+    XmbTextListToTextProperty( m_pDisplay,
+                               &pT,
+                               1,
+                               XCompoundTextStyle,
+                               &aProp );
+    if( aProp.value )
+    {
+        aRet = reinterpret_cast<char*>(aProp.value);
+        XFree( aProp.value );
+#ifdef __sun
+        /*
+         *  for currently unknown reasons XmbTextListToTextProperty on Solaris returns
+         *  no data in ISO8859-n encodings (at least for n = 1, 15)
+         *  in these encodings the directly converted text does the
+         *  trick, also.
+         */
+        if( aRet.isEmpty() && !rText.isEmpty() )
+            aRet = OUStringToOString( rText, osl_getThreadTextEncoding() );
+#endif
+    }
+    else
+        aRet.clear();
+
+    return aRet;
+}
+
+bool SelectionManager::convertData(
+                                   const css::uno::Reference< XTransferable >& xTransferable,
+                                   Atom nType,
+                                   Atom nSelection,
+                                   int& rFormat,
+                                   Sequence< sal_Int8 >& rData )
+{
+    bool bSuccess = false;
+
+    if( ! xTransferable.is() )
+        return bSuccess;
+
+    try
+    {
+
+        DataFlavor aFlavor;
+        aFlavor.MimeType = convertTypeFromNative( nType, nSelection, rFormat );
+
+        sal_Int32 nIndex = 0;
+        if( aFlavor.MimeType.getToken( 0, ';', nIndex ) == "text/plain" )
+        {
+            if( aFlavor.MimeType.getToken( 0, ';', nIndex ) == "charset=utf-16" )
+                aFlavor.DataType = cppu::UnoType<OUString>::get();
+            else
+                aFlavor.DataType = cppu::UnoType<Sequence< sal_Int8 >>::get();
+        }
+        else
+            aFlavor.DataType = cppu::UnoType<Sequence< sal_Int8 >>::get();
+
+        if( xTransferable->isDataFlavorSupported( aFlavor ) )
+        {
+            Any aValue( xTransferable->getTransferData( aFlavor ) );
+            if( aValue.getValueTypeClass() == TypeClass_STRING )
+            {
+                OUString aString;
+                aValue >>= aString;
+                rData = Sequence< sal_Int8 >( reinterpret_cast<sal_Int8 const *>(aString.getStr()), aString.getLength() * sizeof( sal_Unicode ) );
+                bSuccess = true;
+            }
+            else if( aValue.getValueType() == cppu::UnoType<Sequence< sal_Int8 >>::get() )
+            {
+                aValue >>= rData;
+                bSuccess = true;
+            }
+        }
+        else if( aFlavor.MimeType.startsWith("text/plain") )
+        {
+            rtl_TextEncoding aEncoding = RTL_TEXTENCODING_DONTKNOW;
+            bool bCompoundText = false;
+            if( nType == m_nCOMPOUNDAtom )
+                bCompoundText = true;
+            else
+                aEncoding = getTextPlainEncoding( aFlavor.MimeType );
+            if( aEncoding != RTL_TEXTENCODING_DONTKNOW || bCompoundText )
+            {
+                aFlavor.MimeType = "text/plain;charset=utf-16";
+                aFlavor.DataType = cppu::UnoType<OUString>::get();
+                if( xTransferable->isDataFlavorSupported( aFlavor ) )
+                {
+                    Any aValue( xTransferable->getTransferData( aFlavor ) );
+                    OUString aString;
+                    aValue >>= aString;
+                    OString aByteString( bCompoundText ? convertToCompound( aString ) : OUStringToOString( aString, aEncoding ) );
+                    rData = Sequence< sal_Int8 >( reinterpret_cast<sal_Int8 const *>(aByteString.getStr()), aByteString.getLength() * sizeof( char ) );
+                    bSuccess = true;
+                }
+            }
+        }
+    }
+    // various exceptions possible ... which all lead to a failed conversion
+    // so simplify here to a catch all
+    catch(...)
+    {
+    }
+
+    return bSuccess;
+}
+
+SelectionManager& SelectionManager::get( const OUString& rDisplayName )
+{
+    osl::MutexGuard aGuard( *osl::Mutex::getGlobalMutex() );
+
+    OUString aDisplayName( rDisplayName );
+    if( aDisplayName.isEmpty() )
+        aDisplayName = OStringToOUString( getenv( "DISPLAY" ), RTL_TEXTENCODING_ISO_8859_1 );
+    SelectionManager* pInstance = nullptr;
+
+    std::unordered_map< OUString, SelectionManager* >::iterator it = getInstances().find( aDisplayName );
+    if( it != getInstances().end() )
+        pInstance = it->second;
+    else pInstance = getInstances()[ aDisplayName ] = new SelectionManager();
+
+    return *pInstance;
+}
+
+OUString SelectionManager::getString( Atom aAtom )
+{
+    osl::MutexGuard aGuard(m_aMutex);
+
+    if( m_aAtomToString.find( aAtom ) == m_aAtomToString.end() )
+    {
+        char* pAtom = m_pDisplay ? XGetAtomName( m_pDisplay, aAtom ) : nullptr;
+        if( ! pAtom )
+            return OUString();
+        OUString aString( OStringToOUString( pAtom, RTL_TEXTENCODING_ISO_8859_1 ) );
+        XFree( pAtom );
+        m_aStringToAtom[ aString ] = aAtom;
+        m_aAtomToString[ aAtom ] = aString;
+    }
+    return m_aAtomToString[ aAtom ];
+}
+
+Atom SelectionManager::getAtom( const OUString& rString )
+{
+    osl::MutexGuard aGuard(m_aMutex);
+
+    if( m_aStringToAtom.find( rString ) == m_aStringToAtom.end() )
+    {
+        static Atom nNoDisplayAtoms = 1;
+        Atom aAtom = m_pDisplay ? XInternAtom( m_pDisplay, OUStringToOString( rString, RTL_TEXTENCODING_ISO_8859_1 ).getStr(), False ) : nNoDisplayAtoms++;
+        m_aStringToAtom[ rString ] = aAtom;
+        m_aAtomToString[ aAtom ] = rString;
+    }
+    return m_aStringToAtom[ rString ];
+}
+
+bool SelectionManager::requestOwnership( Atom selection )
+{
+    bool bSuccess = false;
+    if( m_pDisplay && m_aWindow )
+    {
+        osl::MutexGuard aGuard(m_aMutex);
+
+        SelectionAdaptor* pAdaptor = getAdaptor( selection );
+        if( pAdaptor )
+        {
+            XSetSelectionOwner( m_pDisplay, selection, m_aWindow, CurrentTime );
+            if( XGetSelectionOwner( m_pDisplay, selection ) == m_aWindow )
+                bSuccess = true;
+
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans",
+                    (bSuccess ? "acquired" : "failed to acquire")
+                    << " ownership for selection "
+                    << getString( selection ));
+#endif
+
+            Selection* pSel = m_aSelections[ selection ];
+            pSel->m_bOwner = bSuccess;
+            delete pSel->m_pPixmap;
+            pSel->m_pPixmap = nullptr;
+            pSel->m_nOrigTimestamp = m_nSelectionTimestamp;
+        }
+#if OSL_DEBUG_LEVEL > 1
+        else
+            SAL_WARN("vcl.unx.dtrans", "no adaptor for selection "
+                    << getString( selection ));
+
+        if( pAdaptor->getTransferable().is() )
+        {
+            Sequence< DataFlavor > aTypes = pAdaptor->getTransferable()->getTransferDataFlavors();
+            for( int i = 0; i < aTypes.getLength(); i++ )
+            {
+                SAL_INFO("vcl.unx.dtrans", "   " << aTypes.getConstArray()[i].MimeType);
+            }
+        }
+#endif
+    }
+    return bSuccess;
+}
+
+void SelectionManager::convertTypeToNative( const OUString& rType, Atom selection, int& rFormat, ::std::list< Atom >& rConversions, bool bPushFront )
+{
+    NativeTypeEntry* pTab = selection == m_nXdndSelection ? aXdndConversionTab : aNativeConversionTab;
+    int nTabEntries = selection == m_nXdndSelection ? SAL_N_ELEMENTS(aXdndConversionTab) : SAL_N_ELEMENTS(aNativeConversionTab);
+
+    OString aType( OUStringToOString( rType, RTL_TEXTENCODING_ISO_8859_1 ) );
+    SAL_INFO( "vcl.unx.dtrans", "convertTypeToNative " << aType );
+    rFormat = 0;
+    for( int i = 0; i < nTabEntries; i++ )
+    {
+        if( aType.equalsIgnoreAsciiCase( pTab[i].pType ) )
+        {
+            if( ! pTab[i].nAtom )
+                pTab[i].nAtom = getAtom( OStringToOUString( pTab[i].pNativeType, RTL_TEXTENCODING_ISO_8859_1 ) );
+            rFormat = pTab[i].nFormat;
+            if( bPushFront )
+                rConversions.push_front( pTab[i].nAtom );
+            else
+                rConversions.push_back( pTab[i].nAtom );
+            if( pTab[i].nFormat == XA_PIXMAP )
+            {
+                if( bPushFront )
+                {
+                    rConversions.push_front( XA_VISUALID );
+                    rConversions.push_front( XA_COLORMAP );
+                }
+                else
+                {
+                    rConversions.push_back( XA_VISUALID );
+                    rConversions.push_back( XA_COLORMAP );
+                }
+            }
+        }
+    }
+    if( ! rFormat )
+        rFormat = 8; // byte buffer
+    if( bPushFront )
+        rConversions.push_front( getAtom( rType ) );
+    else
+        rConversions.push_back( getAtom( rType ) );
+};
+
+void SelectionManager::getNativeTypeList( const Sequence< DataFlavor >& rTypes, std::list< Atom >& rOutTypeList, Atom targetselection )
+{
+    rOutTypeList.clear();
+
+    int nFormat;
+    bool bHaveText = false;
+    for( const auto& rFlavor : rTypes )
+    {
+        if( rFlavor.MimeType.startsWith("text/plain"))
+            bHaveText = true;
+        else
+            convertTypeToNative( rFlavor.MimeType, targetselection, nFormat, rOutTypeList );
+    }
+    if( bHaveText )
+    {
+        if( targetselection != m_nXdndSelection )
+        {
+            // only mimetypes should go into Xdnd type list
+            rOutTypeList.push_front( XA_STRING );
+            rOutTypeList.push_front( m_nCOMPOUNDAtom );
+        }
+        convertTypeToNative( "text/plain;charset=utf-8", targetselection, nFormat, rOutTypeList, true );
+    }
+    if( targetselection != m_nXdndSelection )
+        rOutTypeList.push_back( m_nMULTIPLEAtom );
+}
+
+OUString SelectionManager::convertTypeFromNative( Atom nType, Atom selection, int& rFormat )
+{
+    NativeTypeEntry* pTab = (selection == m_nXdndSelection) ? aXdndConversionTab : aNativeConversionTab;
+    int nTabEntries = (selection == m_nXdndSelection) ? SAL_N_ELEMENTS(aXdndConversionTab) : SAL_N_ELEMENTS(aNativeConversionTab);
+
+    for( int i = 0; i < nTabEntries; i++ )
+    {
+        if( ! pTab[i].nAtom )
+            pTab[i].nAtom = getAtom( OStringToOUString( pTab[i].pNativeType, RTL_TEXTENCODING_ISO_8859_1 ) );
+        if( nType == pTab[i].nAtom )
+        {
+            rFormat = pTab[i].nFormat;
+            return OStringToOUString( pTab[i].pType, RTL_TEXTENCODING_ISO_8859_1 );
+        }
+    }
+    rFormat = 8;
+    return getString( nType );
+}
+
+bool SelectionManager::getPasteData( Atom selection, Atom type, Sequence< sal_Int8 >& rData )
+{
+    osl::ResettableMutexGuard aGuard(m_aMutex);
+    std::unordered_map< Atom, Selection* >::iterator it;
+    bool bSuccess = false;
+
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "getPasteData( " << getString( selection )
+            << ", native: " << getString( type ) << " ).");
+#endif
+
+    if( ! m_pDisplay )
+        return false;
+
+    it = m_aSelections.find( selection );
+    if( it == m_aSelections.end() )
+        return false;
+
+    ::Window aSelectionOwner = XGetSelectionOwner( m_pDisplay, selection );
+    if( aSelectionOwner == None )
+        return false;
+    if( aSelectionOwner == m_aWindow )
+    {
+        // probably bad timing led us here
+#if OSL_DEBUG_LEVEL > 1
+        SAL_WARN("vcl.unx.dtrans", "Innere Nabelschau.");
+#endif
+        return false;
+    }
+
+    // ICCCM recommends to destroy property before convert request unless
+    // parameters are transported; we do only in case of MULTIPLE,
+    // so destroy property unless target is MULTIPLE
+    if( type != m_nMULTIPLEAtom )
+        XDeleteProperty( m_pDisplay, m_aWindow, selection );
+
+    XConvertSelection( m_pDisplay, selection, type, selection, m_aWindow, selection == m_nXdndSelection ? m_nDropTime : CurrentTime );
+    it->second->m_eState            = Selection::WaitingForResponse;
+    it->second->m_aRequestedType    = type;
+    it->second->m_aData             = Sequence< sal_Int8 >();
+    it->second->m_aDataArrived.reset();
+    // really start the request; if we don't flush the
+    // queue the request won't leave it because there are no more
+    // X calls after this until the data arrived or timeout
+    XFlush( m_pDisplay );
+
+    // do a reschedule
+    struct timeval tv_last, tv_current;
+    gettimeofday( &tv_last, nullptr );
+    tv_current = tv_last;
+
+    XEvent aEvent;
+    do
+    {
+        bool bAdjustTime = false;
+        {
+            bool bHandle = false;
+
+            if( XCheckTypedEvent( m_pDisplay,
+                                  PropertyNotify,
+                                  &aEvent
+                                  ) )
+            {
+                bHandle = true;
+                if( aEvent.xproperty.window == m_aWindow
+                    && aEvent.xproperty.atom == selection )
+                    bAdjustTime = true;
+            }
+            else if( XCheckTypedEvent( m_pDisplay,
+                                  SelectionClear,
+                                  &aEvent
+                                  ) )
+            {
+                bHandle = true;
+            }
+            else if( XCheckTypedEvent( m_pDisplay,
+                                  SelectionRequest,
+                                  &aEvent
+                                  ) )
+            {
+                bHandle = true;
+            }
+            else if( XCheckTypedEvent( m_pDisplay,
+                                  SelectionNotify,
+                                  &aEvent
+                                  ) )
+            {
+                bHandle = true;
+                if( aEvent.xselection.selection == selection
+                    && ( aEvent.xselection.requestor == m_aWindow ||
+                         aEvent.xselection.requestor == m_aCurrentDropWindow )
+                    )
+                    bAdjustTime = true;
+            }
+            else
+            {
+                aGuard.clear();
+                osl::Thread::wait(std::chrono::milliseconds(100));
+                aGuard.reset();
+            }
+            if( bHandle )
+            {
+                aGuard.clear();
+                handleXEvent( aEvent );
+                aGuard.reset();
+            }
+        }
+        gettimeofday( &tv_current, nullptr );
+        if( bAdjustTime )
+            tv_last = tv_current;
+    } while( ! it->second->m_aDataArrived.check() && (tv_current.tv_sec - tv_last.tv_sec) < getSelectionTimeout() );
+
+#if OSL_DEBUG_LEVEL > 1
+    SAL_WARN_IF((tv_current.tv_sec - tv_last.tv_sec) > getSelectionTimeout(),
+            "vcl.unx.dtrans", "timed out.");
+#endif
+
+    if( it->second->m_aDataArrived.check() &&
+        it->second->m_aData.getLength() )
+    {
+        rData = it->second->m_aData;
+        bSuccess = true;
+    }
+#if OSL_DEBUG_LEVEL > 1
+    else
+        SAL_WARN("vcl.unx.dtrans", "conversion unsuccessful.");
+#endif
+    return bSuccess;
+}
+
+bool SelectionManager::getPasteData( Atom selection, const OUString& rType, Sequence< sal_Int8 >& rData )
+{
+    bool bSuccess = false;
+
+    std::unordered_map< Atom, Selection* >::iterator it;
+    {
+        osl::MutexGuard aGuard(m_aMutex);
+
+        it = m_aSelections.find( selection );
+        if( it == m_aSelections.end() )
+            return false;
+    }
+
+    if( it->second->m_aTypes.getLength() == 0 )
+    {
+        Sequence< DataFlavor > aFlavors;
+        getPasteDataTypes( selection, aFlavors );
+        if( it->second->m_aTypes.getLength() == 0 )
+            return false;
+    }
+
+    const Sequence< DataFlavor >& rTypes( it->second->m_aTypes );
+    const std::vector< Atom >& rNativeTypes( it->second->m_aNativeTypes );
+
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "getPasteData( \""
+            << getString( selection )
+            << "\", \""
+            << rType << "\" ).");
+#endif
+
+    if( rType == "text/plain;charset=utf-16" )
+    {
+        // lets see if we have UTF16 else try to find something convertible
+        if( it->second->m_aTypes.getLength() && ! it->second->m_bHaveUTF16 )
+        {
+            Sequence< sal_Int8 > aData;
+            if( it->second->m_aUTF8Type != None &&
+                getPasteData( selection,
+                              it->second->m_aUTF8Type,
+                              aData )
+                )
+            {
+              OUString aRet( reinterpret_cast<const char*>(aData.getConstArray()), aData.getLength(), RTL_TEXTENCODING_UTF8 );
+              rData = Sequence< sal_Int8 >( reinterpret_cast<sal_Int8 const *>(aRet.getStr()), (aRet.getLength()+1)*sizeof( sal_Unicode ) );
+              bSuccess = true;
+            }
+            else if( it->second->m_bHaveCompound &&
+                getPasteData( selection,
+                              m_nCOMPOUNDAtom,
+                              aData )
+                )
+            {
+                OUString aRet( convertFromCompound( reinterpret_cast<const char*>(aData.getConstArray()), aData.getLength() ) );
+                rData = Sequence< sal_Int8 >( reinterpret_cast<sal_Int8 const *>(aRet.getStr()), (aRet.getLength()+1)*sizeof( sal_Unicode ) );
+                bSuccess = true;
+            }
+            else
+            {
+                for( int i = 0; i < rTypes.getLength(); i++ )
+                {
+                    rtl_TextEncoding aEncoding = getTextPlainEncoding( rTypes.getConstArray()[i].MimeType );
+                    if( aEncoding != RTL_TEXTENCODING_DONTKNOW  &&
+                        aEncoding != RTL_TEXTENCODING_UNICODE   &&
+                        getPasteData( selection,
+                                      rNativeTypes[i],
+                                      aData )
+                        )
+                    {
+#if OSL_DEBUG_LEVEL > 1
+                        SAL_INFO("vcl.unx.dtrans", "using \""
+                                << rTypes.getConstArray()[i].MimeType
+                                << "\" instead of \""
+                                << rType
+                                << "\".");
+#endif
+
+                        OString aConvert( reinterpret_cast<char const *>(aData.getConstArray()), aData.getLength() );
+                        OUString aUTF( OStringToOUString( aConvert, aEncoding ) );
+                        rData = Sequence< sal_Int8 >( reinterpret_cast<sal_Int8 const *>(aUTF.getStr()), (aUTF.getLength()+1)*sizeof( sal_Unicode ) );
+                        bSuccess = true;
+                        break;
+                    }
+                }
+            }
+        }
+    }
+    else if( rType == "image/bmp" )
+    {
+        // #i83376# try if someone has the data in image/bmp already before
+        // doing the PIXMAP stuff (e.g. the Gimp has this)
+        bSuccess = getPasteData( selection, m_nImageBmpAtom, rData );
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO_IF(bSuccess, "vcl.unx.dtrans",
+                "got " << (int) rData.getLength() << " bytes of image/bmp.");
+#endif
+        if( ! bSuccess )
+        {
+            Pixmap aPixmap = None;
+            Colormap aColormap = None;
+
+            // prepare property for MULTIPLE request
+            Sequence< sal_Int8 > aData;
+            Atom const pTypes[4] = { XA_PIXMAP, XA_PIXMAP, XA_COLORMAP, XA_COLORMAP };
+            {
+                osl::MutexGuard aGuard(m_aMutex);
+
+                XChangeProperty( m_pDisplay,
+                    m_aWindow,
+                    selection,
+                    XA_ATOM,
+                    32,
+                    PropModeReplace,
+                    reinterpret_cast<unsigned char const *>(pTypes),
+                    4 );
+            }
+
+            // try MULTIPLE request
+            if( getPasteData( selection, m_nMULTIPLEAtom, aData ) )
+            {
+                Atom* pReturnedTypes = reinterpret_cast<Atom*>(aData.getArray());
+                if( pReturnedTypes[0] == XA_PIXMAP && pReturnedTypes[1] == XA_PIXMAP )
+                {
+                    osl::MutexGuard aGuard(m_aMutex);
+
+                    Atom type = None;
+                    int format = 0;
+                    unsigned long nItems = 0;
+                    unsigned long nBytes = 0;
+                    unsigned char* pReturn = nullptr;
+                    XGetWindowProperty( m_pDisplay, m_aWindow, XA_PIXMAP, 0, 1, True, XA_PIXMAP, &type, &format, &nItems, &nBytes, &pReturn );
+                    if( pReturn )
+                    {
+                        if( type == XA_PIXMAP )
+                            aPixmap = *reinterpret_cast<Pixmap*>(pReturn);
+                        XFree( pReturn );
+                        pReturn = nullptr;
+                        if( pReturnedTypes[2] == XA_COLORMAP && pReturnedTypes[3] == XA_COLORMAP )
+                        {
+                            XGetWindowProperty( m_pDisplay, m_aWindow, XA_COLORMAP, 0, 1, True, XA_COLORMAP, &type, &format, &nItems, &nBytes, &pReturn );
+                            if( pReturn )
+                            {
+                                if( type == XA_COLORMAP )
+                                    aColormap = *reinterpret_cast<Colormap*>(pReturn);
+                                XFree( pReturn );
+                            }
+                        }
+                    }
+#if OSL_DEBUG_LEVEL > 1
+                    else
+                    {
+                        SAL_WARN("vcl.unx.dtrans", "could not get PIXMAP property: type="
+                                << getString( type )
+                                << ", format=" << format
+                                << ", items=" << nItems
+                                << ", bytes=" << nBytes
+                                << ", ret=0x" << pReturn);
+                    }
+#endif
+                }
+            }
+
+            if( aPixmap == None )
+            {
+                // perhaps two normal requests will work
+                if( getPasteData( selection, XA_PIXMAP, aData ) )
+                {
+                    aPixmap = *reinterpret_cast<Pixmap*>(aData.getArray());
+                    if( aColormap == None && getPasteData( selection, XA_COLORMAP, aData ) )
+                        aColormap = *reinterpret_cast<Colormap*>(aData.getArray());
+                }
+            }
+
+            // convert data if possible
+            if( aPixmap != None )
+            {
+                osl::MutexGuard aGuard(m_aMutex);
+
+                sal_Int32 nOutSize = 0;
+                sal_uInt8* pBytes = X11_getBmpFromPixmap( m_pDisplay, aPixmap, aColormap, nOutSize );
+                if( pBytes )
+                {
+                    if( nOutSize )
+                    {
+                        rData = Sequence< sal_Int8 >( nOutSize );
+                        memcpy( rData.getArray(), pBytes, nOutSize );
+                        bSuccess = true;
+                    }
+                    std::free( pBytes );
+                }
+            }
+        }
+    }
+
+    if( ! bSuccess )
+    {
+        int nFormat;
+        ::std::list< Atom > aTypes;
+        convertTypeToNative( rType, selection, nFormat, aTypes );
+        Atom nSelectedType = None;
+        for (auto const& type : aTypes)
+        {
+            for( auto const & nativeType: rNativeTypes )
+                if(nativeType == type)
+                {
+                    nSelectedType = type;
+                    if (nSelectedType != None)
+                        break;
+                }
+        }
+        if( nSelectedType != None )
+            bSuccess = getPasteData( selection, nSelectedType, rData );
+    }
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "getPasteData for selection "
+            << getString( selection )
+            << " and data type "
+            << rType
+            << " returns "
+            << ( bSuccess ? "true" : "false")
+            << ", returned sequence has length "
+            << rData.getLength() <<  ".");
+#endif
+    return bSuccess;
+}
+
+bool SelectionManager::getPasteDataTypes( Atom selection, Sequence< DataFlavor >& rTypes )
+{
+    std::unordered_map< Atom, Selection* >::iterator it;
+    {
+        osl::MutexGuard aGuard(m_aMutex);
+
+        it = m_aSelections.find( selection );
+        if( it != m_aSelections.end()                           &&
+            it->second->m_aTypes.getLength()                    &&
+            std::abs( it->second->m_nLastTimestamp - time( nullptr ) ) < 2
+            )
+        {
+            rTypes = it->second->m_aTypes;
+            return true;
+        }
+    }
+
+    bool bSuccess = false;
+    bool bHaveUTF16 = false;
+    Atom aUTF8Type = None;
+    bool bHaveCompound = false;
+    Sequence< sal_Int8 > aAtoms;
+
+    if( selection == m_nXdndSelection )
+    {
+        // xdnd sends first three types with XdndEnter
+        // if more than three types are supported then the XDndTypeList
+        // property on the source window is used
+        if( m_aDropEnterEvent.data.l[0] && m_aCurrentDropWindow )
+        {
+            if( m_aDropEnterEvent.data.l[1] & 1 )
+            {
+                const unsigned int atomcount = 256;
+                // more than three types; look in property
+                osl::MutexGuard aGuard(m_aMutex);
+
+                Atom nType;
+                int nFormat;
+                unsigned long nItems, nBytes;
+                unsigned char* pBytes = nullptr;
+
+                XGetWindowProperty( m_pDisplay, m_aDropEnterEvent.data.l[0],
+                                    m_nXdndTypeList, 0, atomcount, False,
+                                    XA_ATOM,
+                                    &nType, &nFormat, &nItems, &nBytes, &pBytes );
+#if OSL_DEBUG_LEVEL > 1
+                SAL_INFO("vcl.unx.dtrans", "have "
+                        << nItems
+                        << " data types in XdndTypeList.");
+#endif
+                if( nItems == atomcount && nBytes > 0 )
+                {
+                    // wow ... more than 256 types !
+                    aAtoms.realloc( sizeof( Atom )*atomcount+nBytes );
+                    memcpy( aAtoms.getArray(), pBytes, sizeof( Atom )*atomcount );
+                    XFree( pBytes );
+                    pBytes = nullptr;
+                    XGetWindowProperty( m_pDisplay, m_aDropEnterEvent.data.l[0],
+                                        m_nXdndTypeList, atomcount, nBytes/sizeof(Atom),
+                                        False, XA_ATOM,
+                                        &nType, &nFormat, &nItems, &nBytes, &pBytes );
+                    {
+                        memcpy( aAtoms.getArray()+atomcount*sizeof(Atom), pBytes, nItems*sizeof(Atom) );
+                        XFree( pBytes );
+                    }
+                }
+                else
+                {
+                    aAtoms.realloc( sizeof(Atom)*nItems );
+                    memcpy( aAtoms.getArray(), pBytes, nItems*sizeof(Atom) );
+                    XFree( pBytes );
+                }
+            }
+            else
+            {
+                // one to three types
+                int n = 0, i;
+                for( i = 0; i < 3; i++ )
+                    if( m_aDropEnterEvent.data.l[2+i] )
+                        n++;
+#if OSL_DEBUG_LEVEL > 1
+                SAL_INFO("vcl.unx.dtrans", "have "
+                        << n
+                        << " data types in XdndEnter.");
+#endif
+                aAtoms.realloc( sizeof(Atom)*n );
+                for( i = 0, n = 0; i < 3; i++ )
+                    if( m_aDropEnterEvent.data.l[2+i] )
+                        reinterpret_cast<Atom*>(aAtoms.getArray())[n++] = m_aDropEnterEvent.data.l[2+i];
+            }
+        }
+    }
+    // get data of type TARGETS
+    else if( ! getPasteData( selection, m_nTARGETSAtom, aAtoms ) )
+        aAtoms = Sequence< sal_Int8 >();
+
+    std::vector< Atom > aNativeTypes;
+    if( aAtoms.hasElements() )
+    {
+        sal_Int32 nAtoms = aAtoms.getLength() / sizeof(Atom);
+        Atom* pAtoms = reinterpret_cast<Atom*>(aAtoms.getArray());
+        rTypes.realloc( nAtoms );
+        aNativeTypes.resize( nAtoms );
+        DataFlavor* pFlavors = rTypes.getArray();
+        sal_Int32 nNativeTypesIndex = 0;
+        bool bHaveText = false;
+        while( nAtoms-- )
+        {
+            SAL_INFO_IF(*pAtoms && *pAtoms < 0x01000000, "vcl.unx.dtrans",
+                "getPasteDataTypes: available: \"" << getString(*pAtoms) << "\"");
+            if( *pAtoms == m_nCOMPOUNDAtom )
+                bHaveText = bHaveCompound = true;
+            else if( *pAtoms && *pAtoms < 0x01000000 )
+            {
+                int nFormat;
+                pFlavors->MimeType = convertTypeFromNative( *pAtoms, selection, nFormat );
+                pFlavors->DataType = cppu::UnoType<Sequence< sal_Int8 >>::get();
+                sal_Int32 nIndex = 0;
+                if( pFlavors->MimeType.getToken( 0, ';', nIndex ) == "text/plain" )
+                {
+                    OUString aToken(pFlavors->MimeType.getToken( 0, ';', nIndex ));
+                    // omit text/plain;charset=unicode since it is not well defined
+                    if( aToken == "charset=unicode" )
+                    {
+                        pAtoms++;
+                        continue;
+                    }
+                    bHaveText = true;
+                    if( aToken == "charset=utf-16" )
+                    {
+                        bHaveUTF16 = true;
+                        pFlavors->DataType = cppu::UnoType<OUString>::get();
+                    }
+                    else if( aToken == "charset=utf-8" )
+                    {
+                        aUTF8Type = *pAtoms;
+                    }
+                }
+                pFlavors++;
+                aNativeTypes[ nNativeTypesIndex ] = *pAtoms;
+                nNativeTypesIndex++;
+            }
+            pAtoms++;
+        }
+        if( (pFlavors - rTypes.getArray()) < rTypes.getLength() )
+            rTypes.realloc(pFlavors - rTypes.getArray());
+        bSuccess = rTypes.hasElements();
+        if( bHaveText && ! bHaveUTF16 )
+        {
+            int i = 0;
+
+            int nNewFlavors = rTypes.getLength()+1;
+            Sequence< DataFlavor > aTemp( nNewFlavors );
+            for( i = 0; i < nNewFlavors-1; i++ )
+                aTemp.getArray()[i+1] = rTypes.getConstArray()[i];
+            aTemp.getArray()[0].MimeType = "text/plain;charset=utf-16";
+            aTemp.getArray()[0].DataType = cppu::UnoType<OUString>::get();
+            rTypes = aTemp;
+
+            std::vector< Atom > aNativeTemp( nNewFlavors );
+            for( i = 0; i < nNewFlavors-1; i++ )
+                aNativeTemp[ i + 1 ] = aNativeTypes[ i ];
+            aNativeTemp[0] = None;
+            aNativeTypes = aNativeTemp;
+        }
+    }
+
+    {
+        osl::MutexGuard aGuard(m_aMutex);
+
+        it = m_aSelections.find( selection );
+        if( it != m_aSelections.end() )
+        {
+            if( bSuccess )
+            {
+                it->second->m_aTypes            = rTypes;
+                it->second->m_aNativeTypes      = aNativeTypes;
+                it->second->m_nLastTimestamp    = time( nullptr );
+                it->second->m_bHaveUTF16        = bHaveUTF16;
+                it->second->m_aUTF8Type         = aUTF8Type;
+                it->second->m_bHaveCompound     = bHaveCompound;
+            }
+            else
+            {
+                it->second->m_aTypes            = Sequence< DataFlavor >();
+                it->second->m_aNativeTypes      = std::vector< Atom >();
+                it->second->m_nLastTimestamp    = 0;
+                it->second->m_bHaveUTF16        = false;
+                it->second->m_aUTF8Type         = None;
+                it->second->m_bHaveCompound     = false;
+            }
+        }
+    }
+
+#if OSL_DEBUG_LEVEL > 1
+    {
+        SAL_INFO("vcl.unx.dtrans", "SelectionManager::getPasteDataTypes( "
+                << getString( selection )
+                << " ) = "
+                << (bSuccess ? "true" : "false"));
+        for( int i = 0; i < rTypes.getLength(); i++ )
+            SAL_INFO("vcl.unx.dtrans", "type: " << rTypes.getConstArray()[i].MimeType);
+    }
+#endif
+
+    return bSuccess;
+}
+
+PixmapHolder* SelectionManager::getPixmapHolder( Atom selection )
+{
+    std::unordered_map< Atom, Selection* >::const_iterator it = m_aSelections.find( selection );
+    if( it == m_aSelections.end() )
+        return nullptr;
+    if( ! it->second->m_pPixmap )
+        it->second->m_pPixmap = new PixmapHolder( m_pDisplay );
+    return it->second->m_pPixmap;
+}
+
+static std::size_t GetTrueFormatSize(int nFormat)
+{
+    // http://mail.gnome.org/archives/wm-spec-list/2003-March/msg00067.html
+    return nFormat == 32 ? sizeof(long) : nFormat/8;
+}
+
+bool SelectionManager::sendData( SelectionAdaptor* pAdaptor,
+                                 ::Window requestor,
+                                 Atom target,
+                                 Atom property,
+                                 Atom selection )
+{
+    osl::ResettableMutexGuard aGuard( m_aMutex );
+
+    // handle targets related to image/bmp
+    if( target == XA_COLORMAP || target == XA_PIXMAP || target == XA_BITMAP || target == XA_VISUALID )
+    {
+        PixmapHolder* pPixmap = getPixmapHolder( selection );
+        if( ! pPixmap ) return false;
+        XID nValue = None;
+
+        // handle colormap request
+        if( target == XA_COLORMAP )
+            nValue = static_cast<XID>(pPixmap->getColormap());
+        else if( target == XA_VISUALID )
+            nValue = static_cast<XID>(pPixmap->getVisualID());
+        else if( target == XA_PIXMAP || target == XA_BITMAP )
+        {
+            nValue = static_cast<XID>(pPixmap->getPixmap());
+            if( nValue == None )
+            {
+                // first conversion
+                Sequence< sal_Int8 > aData;
+                int nFormat;
+                aGuard.clear();
+                bool bConverted = convertData( pAdaptor->getTransferable(), target, selection, nFormat, aData );
+                aGuard.reset();
+                if( bConverted )
+                {
+                    // get pixmap again since clearing the guard could have invalidated
+                    // the pixmap in another thread
+                    pPixmap = getPixmapHolder( selection );
+                    // conversion succeeded, so aData contains image/bmp now
+                    if( pPixmap->needsConversion( reinterpret_cast<const sal_uInt8*>(aData.getConstArray()) ) )
+                    {
+                        SAL_INFO( "vcl.unx.dtrans", "trying bitmap conversion" );
+                        int depth = pPixmap->getDepth();
+                        aGuard.clear();
+                        aData = convertBitmapDepth(aData, depth);
+                        aGuard.reset();
+                    }
+                    // get pixmap again since clearing the guard could have invalidated
+                    // the pixmap in another thread
+                    pPixmap = getPixmapHolder( selection );
+                    nValue = static_cast<XID>(pPixmap->setBitmapData( reinterpret_cast<const sal_uInt8*>(aData.getConstArray()) ));
+                }
+                if( nValue == None )
+                    return false;
+            }
+            if( target == XA_BITMAP )
+                nValue = static_cast<XID>(pPixmap->getBitmap());
+        }
+
+        XChangeProperty( m_pDisplay,
+                         requestor,
+                         property,
+                         target,
+                         32,
+                         PropModeReplace,
+                         reinterpret_cast<const unsigned char*>(&nValue),
+                         1);
+        return true;
+    }
+
+    /*
+     *  special target TEXT allows us to transfer
+     *  the data in an encoding of our choice
+     *  COMPOUND_TEXT will work with most applications
+     */
+    if( target == m_nTEXTAtom )
+        target = m_nCOMPOUNDAtom;
+
+    Sequence< sal_Int8 > aData;
+    int nFormat;
+    aGuard.clear();
+    bool bConverted = convertData( pAdaptor->getTransferable(), target, selection, nFormat, aData );
+    aGuard.reset();
+    if( bConverted )
+    {
+        // conversion succeeded
+        if( aData.getLength() > m_nIncrementalThreshold )
+        {
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "using INCR protocol.");
+            std::unordered_map< ::Window, std::unordered_map< Atom, IncrementalTransfer > >::const_iterator win_it = m_aIncrementals.find( requestor );
+            if( win_it != m_aIncrementals.end() )
+            {
+                std::unordered_map< Atom, IncrementalTransfer >::const_iterator inc_it = win_it->second.find( property );
+                if( inc_it != win_it->second.end() )
+                {
+                    const IncrementalTransfer& rInc = inc_it->second;
+                    SAL_INFO("vcl.unx.dtrans", "premature end and new start for INCR transfer for window "
+                            << std::showbase << std::hex
+                            << rInc.m_aRequestor
+                            << ", property "
+                            << getString( rInc.m_aProperty )
+                            << ", type "
+                            << getString( rInc.m_aTarget ));
+                }
+            }
+#endif
+
+            // insert IncrementalTransfer
+            IncrementalTransfer& rInc   = m_aIncrementals[ requestor ][ property ];
+            rInc.m_aData                = aData;
+            rInc.m_nBufferPos           = 0;
+            rInc.m_aRequestor           = requestor;
+            rInc.m_aProperty            = property;
+            rInc.m_aTarget              = target;
+            rInc.m_nFormat              = nFormat;
+            rInc.m_nTransferStartTime   = time( nullptr );
+
+            // use incr protocol, signal start to requestor
+            long nMinSize = m_nIncrementalThreshold;
+            XSelectInput( m_pDisplay, requestor, PropertyChangeMask );
+            XChangeProperty( m_pDisplay, requestor, property,
+                             m_nINCRAtom, 32,  PropModeReplace, reinterpret_cast<unsigned char*>(&nMinSize), 1 );
+            XFlush( m_pDisplay );
+        }
+        else
+        {
+            std::size_t nUnitSize = GetTrueFormatSize(nFormat);
+            XChangeProperty( m_pDisplay,
+                             requestor,
+                             property,
+                             target,
+                             nFormat,
+                             PropModeReplace,
+                             reinterpret_cast<const unsigned char*>(aData.getConstArray()),
+                             aData.getLength()/nUnitSize );
+            }
+    }
+#if OSL_DEBUG_LEVEL > 1
+    else
+        SAL_WARN("vcl.unx.dtrans", "convertData failed for type: "
+                << convertTypeFromNative( target, selection, nFormat ));
+#endif
+    return bConverted;
+}
+
+bool SelectionManager::handleSelectionRequest( XSelectionRequestEvent& rRequest )
+{
+    osl::ResettableMutexGuard aGuard( m_aMutex );
+
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "handleSelectionRequest for selection "
+            << getString( rRequest.selection )
+            << " and target "
+            << getString( rRequest.target ));
+#endif
+
+    XEvent aNotify;
+
+    aNotify.type                  = SelectionNotify;
+    aNotify.xselection.display    = rRequest.display;
+    aNotify.xselection.send_event = True;
+    aNotify.xselection.requestor  = rRequest.requestor;
+    aNotify.xselection.selection  = rRequest.selection;
+    aNotify.xselection.time       = rRequest.time;
+    aNotify.xselection.target     = rRequest.target;
+    aNotify.xselection.property   = None;
+
+    SelectionAdaptor* pAdaptor = getAdaptor( rRequest.selection );
+    // ensure that we still own that selection
+    if( pAdaptor &&
+        XGetSelectionOwner( m_pDisplay, rRequest.selection ) == m_aWindow )
+    {
+        css::uno::Reference< XTransferable > xTrans( pAdaptor->getTransferable() );
+        if( rRequest.target == m_nTARGETSAtom )
+        {
+            // someone requests our types
+            if( xTrans.is() )
+            {
+                aGuard.clear();
+                Sequence< DataFlavor > aFlavors = xTrans->getTransferDataFlavors();
+                aGuard.reset();
+
+                ::std::list< Atom > aConversions;
+                getNativeTypeList( aFlavors, aConversions, rRequest.selection );
+
+                int i, nTypes = aConversions.size();
+                Atom* pTypes = static_cast<Atom*>(alloca( nTypes * sizeof( Atom ) ));
+                std::list< Atom >::const_iterator it;
+                for( i = 0, it = aConversions.begin(); i < nTypes; i++, ++it )
+                    pTypes[i] = *it;
+                XChangeProperty( m_pDisplay, rRequest.requestor, rRequest.property,
+                                 XA_ATOM, 32, PropModeReplace, reinterpret_cast<unsigned char*>(pTypes), nTypes );
+                aNotify.xselection.property = rRequest.property;
+#if OSL_DEBUG_LEVEL > 1
+                SAL_INFO("vcl.unx.dtrans", "sending type list:");
+                for( int k = 0; k < nTypes; k++ )
+                    SAL_INFO("vcl.unx.dtrans", "   "
+                            << (pTypes[k] ? XGetAtomName( m_pDisplay, pTypes[k] ) :
+                                "<None>"));
+#endif
+            }
+        }
+        else if( rRequest.target == m_nTIMESTAMPAtom )
+        {
+            long nTimeStamp = static_cast<long>(m_aSelections[rRequest.selection]->m_nOrigTimestamp);
+            XChangeProperty( m_pDisplay, rRequest.requestor, rRequest.property,
+                             XA_INTEGER, 32, PropModeReplace, reinterpret_cast<unsigned char*>(&nTimeStamp), 1 );
+            aNotify.xselection.property = rRequest.property;
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "sending timestamp: " << (int)nTimeStamp);
+#endif
+        }
+        else
+        {
+            bool bEventSuccess = false;
+            if( rRequest.target == m_nMULTIPLEAtom )
+            {
+                // get all targets
+                Atom nType = None;
+                int nFormat = 0;
+                unsigned long nItems = 0, nBytes = 0;
+                unsigned char* pData = nullptr;
+
+                // get number of atoms
+                XGetWindowProperty( m_pDisplay,
+                                    rRequest.requestor,
+                                    rRequest.property,
+                                    0, 0,
+                                    False,
+                                    AnyPropertyType,
+                                    &nType, &nFormat,
+                                    &nItems, &nBytes,
+                                    &pData );
+                if( nFormat == 32 && nBytes/4 )
+                {
+                    if( pData ) // ?? should not happen
+                    {
+                        XFree( pData );
+                        pData = nullptr;
+                    }
+                    XGetWindowProperty( m_pDisplay,
+                                        rRequest.requestor,
+                                        rRequest.property,
+                                        0, nBytes/4,
+                                        False,
+                                        nType,
+                                        &nType, &nFormat,
+                                        &nItems, &nBytes,
+                                        &pData );
+                    if( pData && nItems )
+                    {
+#if OSL_DEBUG_LEVEL > 1
+                        SAL_INFO("vcl.unx.dtrans", "found "
+                                << nItems
+                                << " atoms in MULTIPLE request.");
+#endif
+                        bEventSuccess = true;
+                        bool bResetAtoms = false;
+                        Atom* pAtoms = reinterpret_cast<Atom*>(pData);
+                        aGuard.clear();
+                        for( unsigned long i = 0; i < nItems; i += 2 )
+                        {
+#if OSL_DEBUG_LEVEL > 1
+                            std::ostringstream oss;
+                            oss << "   "
+                                << getString( pAtoms[i] )
+                                << " => "
+                                << getString( pAtoms[i+1] )
+                                << ": ";
+#endif
+
+                            bool bSuccess = sendData( pAdaptor, rRequest.requestor, pAtoms[i], pAtoms[i+1], rRequest.selection );
+#if OSL_DEBUG_LEVEL > 1
+                            oss << (bSuccess ? "succeeded" : "failed");
+                            SAL_INFO("vcl.unx.dtrans", oss.str());
+#endif
+                            if( ! bSuccess )
+                            {
+                                pAtoms[i] = None;
+                                bResetAtoms = true;
+                            }
+                        }
+                        aGuard.reset();
+                        if( bResetAtoms )
+                            XChangeProperty( m_pDisplay,
+                                             rRequest.requestor,
+                                             rRequest.property,
+                                             XA_ATOM,
+                                             32,
+                                             PropModeReplace,
+                                             pData,
+                                             nBytes/4 );
+                    }
+                    if( pData )
+                        XFree( pData );
+                }
+#if OSL_DEBUG_LEVEL > 1
+                else
+                {
+                    std::ostringstream oss;
+                    oss << "could not get type list from \""
+                        << getString( rRequest.property )
+                        << "\" of type \""
+                        << getString( nType )
+                        << "\" on requestor "
+                        << std::showbase << std::hex
+                        << rRequest.requestor
+                        << ", requestor has properties:";
+
+                    int nProps = 0;
+                    Atom* pProps = XListProperties( m_pDisplay, rRequest.requestor, &nProps );
+                    if( pProps )
+                    {
+                        for( int i = 0; i < nProps; i++ )
+                            oss << " \"" << getString( pProps[i]) << "\"";
+                        XFree( pProps );
+                    }
+                    SAL_INFO("vcl.unx.dtrans", oss.str());
+                }
+#endif
+            }
+            else
+            {
+                aGuard.clear();
+                bEventSuccess = sendData( pAdaptor, rRequest.requestor, rRequest.target, rRequest.property, rRequest.selection );
+                aGuard.reset();
+            }
+            if( bEventSuccess )
+            {
+                aNotify.xselection.target = rRequest.target;
+                aNotify.xselection.property = rRequest.property;
+            }
+        }
+        aGuard.clear();
+        xTrans.clear();
+        aGuard.reset();
+    }
+    XSendEvent( m_pDisplay, rRequest.requestor, False, 0, &aNotify );
+
+    if( rRequest.selection == XA_PRIMARY    &&
+        m_bWaitingForPrimaryConversion      &&
+        m_xDragSourceListener.is() )
+    {
+        DragSourceDropEvent dsde;
+        dsde.Source                 = static_cast< OWeakObject* >(this);
+        dsde.DragSourceContext      = new DragSourceContext( m_aDropWindow, *this );
+        dsde.DragSource             = static_cast< XDragSource* >(this);
+        if( aNotify.xselection.property != None )
+        {
+            dsde.DropAction         = DNDConstants::ACTION_COPY;
+            dsde.DropSuccess        = true;
+        }
+        else
+        {
+            dsde.DropAction         = DNDConstants::ACTION_NONE;
+            dsde.DropSuccess        = false;
+        }
+        css::uno::Reference< XDragSourceListener > xListener( m_xDragSourceListener );
+        m_xDragSourceListener.clear();
+        aGuard.clear();
+        if( xListener.is() )
+            xListener->dragDropEnd( dsde );
+    }
+
+    // we handled the event in any case by answering
+    return true;
+}
+
+bool SelectionManager::handleReceivePropertyNotify( XPropertyEvent const & rNotify )
+{
+    osl::MutexGuard aGuard( m_aMutex );
+    // data we requested arrived
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "handleReceivePropertyNotify for property "
+             << getString( rNotify.atom ));
+#endif
+    bool bHandled = false;
+
+    std::unordered_map< Atom, Selection* >::iterator it =
+          m_aSelections.find( rNotify.atom );
+    if( it != m_aSelections.end() &&
+        rNotify.state == PropertyNewValue &&
+        ( it->second->m_eState == Selection::WaitingForResponse     ||
+          it->second->m_eState == Selection::WaitingForData         ||
+          it->second->m_eState == Selection::IncrementalTransfer
+          )
+        )
+    {
+        // MULTIPLE requests are only complete after selection notify
+        if( it->second->m_aRequestedType == m_nMULTIPLEAtom &&
+            ( it->second->m_eState == Selection::WaitingForResponse ||
+              it->second->m_eState == Selection::WaitingForData ) )
+            return false;
+
+        bHandled = true;
+
+        Atom nType = None;
+        int nFormat = 0;
+        unsigned long nItems = 0, nBytes = 0;
+        unsigned char* pData = nullptr;
+
+        // get type and length
+        XGetWindowProperty( m_pDisplay,
+                            rNotify.window,
+                            rNotify.atom,
+                            0, 0,
+                            False,
+                            AnyPropertyType,
+                            &nType, &nFormat,
+                            &nItems, &nBytes,
+                            &pData );
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "found "
+                << nBytes
+                << " bytes data of type "
+                << getString( nType )
+                << " and format "
+                << nFormat
+                << ", items = "
+                << nItems);
+#endif
+        if( pData )
+        {
+            XFree( pData );
+            pData = nullptr;
+        }
+
+        if( nType == m_nINCRAtom )
+        {
+            // start data transfer
+            XDeleteProperty( m_pDisplay, rNotify.window, rNotify.atom );
+            it->second->m_eState = Selection::IncrementalTransfer;
+        }
+        else if( nType != None )
+        {
+            XGetWindowProperty( m_pDisplay,
+                                rNotify.window,
+                                rNotify.atom,
+                                0, nBytes/4 +1,
+                                True,
+                                nType,
+                                &nType, &nFormat,
+                                &nItems, &nBytes,
+                                &pData );
+
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "read "
+                    << nItems
+                    << " items data of type "
+                    << getString( nType )
+                    << " and format "
+                    << nFormat
+                    << ", "
+                    << nBytes
+                    << " bytes left in property.");
+#endif
+
+            std::size_t nUnitSize = GetTrueFormatSize(nFormat);
+
+            if( it->second->m_eState == Selection::WaitingForData ||
+                it->second->m_eState == Selection::WaitingForResponse )
+            {
+                // copy data
+                it->second->m_aData = Sequence< sal_Int8 >( reinterpret_cast<sal_Int8*>(pData), nItems*nUnitSize );
+                it->second->m_eState = Selection::Inactive;
+                it->second->m_aDataArrived.set();
+            }
+            else if( it->second->m_eState == Selection::IncrementalTransfer )
+            {
+                if( nItems )
+                {
+                    // append data
+                    Sequence< sal_Int8 > aData( it->second->m_aData.getLength() + nItems*nUnitSize );
+                    memcpy( aData.getArray(), it->second->m_aData.getArray(), it->second->m_aData.getLength() );
+                    memcpy( aData.getArray() + it->second->m_aData.getLength(), pData, nItems*nUnitSize );
+                    it->second->m_aData = aData;
+                }
+                else
+                {
+                    it->second->m_eState = Selection::Inactive;
+                    it->second->m_aDataArrived.set();
+                }
+            }
+            if( pData )
+                XFree( pData );
+        }
+        else if( it->second->m_eState == Selection::IncrementalTransfer )
+        {
+            it->second->m_eState = Selection::Inactive;
+            it->second->m_aDataArrived.set();
+        }
+    }
+    return bHandled;
+}
+
+bool SelectionManager::handleSendPropertyNotify( XPropertyEvent const & rNotify )
+{
+    osl::MutexGuard aGuard( m_aMutex );
+
+    // ready for next part of an IncrementalTransfer
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "handleSendPropertyNotify for property "
+            << getString( rNotify.atom )
+            << " ("
+            << (rNotify.state == PropertyNewValue ?
+                "new value" :
+                (rNotify.state == PropertyDelete ?
+                  "deleted" :
+                  "unknown"))
+            << ").");
+#endif
+
+    bool bHandled = false;
+    // feed incrementals
+    if( rNotify.state == PropertyDelete )
+    {
+        auto it = m_aIncrementals.find( rNotify.window );
+        if( it != m_aIncrementals.end() )
+        {
+            bHandled = true;
+            int nCurrentTime = time( nullptr );
+            // throw out aborted transfers
+            std::vector< Atom > aTimeouts;
+            for (auto const& incrementalTransfer : it->second)
+            {
+                if( (nCurrentTime - incrementalTransfer.second.m_nTransferStartTime) > (getSelectionTimeout()+2) )
+                {
+                    aTimeouts.push_back( incrementalTransfer.first );
+#if OSL_DEBUG_LEVEL > 1
+                    const IncrementalTransfer& rInc = incrementalTransfer.second;
+                    SAL_INFO("vcl.unx.dtrans",
+                            "timeout on INCR transfer for window "
+                            << std::showbase << std::hex
+                            << rInc.m_aRequestor
+                            << ", property "
+                            << getString( rInc.m_aProperty )
+                            << ", type "
+                            << getString( rInc.m_aTarget ));
+#endif
+                }
+            }
+
+            for (auto const& timeout : aTimeouts)
+            {
+                // transfer broken, might even be a new client with the
+                // same window id
+                it->second.erase( timeout );
+            }
+            aTimeouts.clear();
+
+            auto inc_it = it->second.find( rNotify.atom );
+            if( inc_it != it->second.end() )
+            {
+                IncrementalTransfer& rInc = inc_it->second;
+
+                int nBytes = rInc.m_aData.getLength() - rInc.m_nBufferPos;
+                nBytes = std::min(nBytes, m_nIncrementalThreshold);
+                if( nBytes < 0 )  // sanity check
+                    nBytes = 0;
+#if OSL_DEBUG_LEVEL > 1
+                SAL_INFO("vcl.unx.dtrans", "pushing "
+                        << nBytes
+                        << " bytes: \""
+                        << std::setw(std::min(nBytes, 32))
+                        << ((const unsigned char*)
+                            rInc.m_aData.getConstArray()+rInc.m_nBufferPos)
+                        << "\"...");
+#endif
+                std::size_t nUnitSize = GetTrueFormatSize(rInc.m_nFormat);
+
+                XChangeProperty( m_pDisplay,
+                                 rInc.m_aRequestor,
+                                 rInc.m_aProperty,
+                                 rInc.m_aTarget,
+                                 rInc.m_nFormat,
+                                 PropModeReplace,
+                                 reinterpret_cast<const unsigned char*>(rInc.m_aData.getConstArray())+rInc.m_nBufferPos,
+                                 nBytes/nUnitSize );
+                rInc.m_nBufferPos += nBytes;
+                rInc.m_nTransferStartTime = nCurrentTime;
+
+                if( nBytes == 0 ) // transfer finished
+                {
+#if OSL_DEBUG_LEVEL > 1
+                    SAL_INFO("vcl.unx.dtrans", "finished INCR transfer for "
+                            << "window "
+                            << std::showbase << std::hex
+                            << rInc.m_aRequestor
+                            << ", property "
+                            << getString( rInc.m_aProperty )
+                            << ", type "
+                            << getString( rInc.m_aTarget ));
+#endif
+                    it->second.erase( inc_it );
+                }
+
+            }
+            // eventually clean up the hash map
+            if( it->second.empty() )
+                m_aIncrementals.erase( it );
+        }
+    }
+    return bHandled;
+}
+
+bool SelectionManager::handleSelectionNotify( XSelectionEvent const & rNotify )
+{
+    osl::MutexGuard aGuard( m_aMutex );
+
+    bool bHandled = false;
+
+    // notification about success/failure of one of our conversion requests
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "handleSelectionNotify for selection "
+            << getString( rNotify.selection )
+            << " and property "
+            << (rNotify.property ? getString( rNotify.property ) : "None")
+            << " ("
+            << std::showbase << std::hex
+            << rNotify.property
+            << ").");
+    SAL_WARN_IF(rNotify.requestor != m_aWindow &&
+            rNotify.requestor != m_aCurrentDropWindow,
+            "vcl.unx.dtrans", "selection notify for unknown window "
+            << std::showbase << std::hex
+            << rNotify.requestor);
+#endif
+    std::unordered_map< Atom, Selection* >::iterator it =
+          m_aSelections.find( rNotify.selection );
+    if (
+        (rNotify.requestor == m_aWindow || rNotify.requestor == m_aCurrentDropWindow) &&
+        it != m_aSelections.end() &&
+        (
+         (it->second->m_eState == Selection::WaitingForResponse) ||
+         (it->second->m_eState == Selection::WaitingForData)
+        )
+       )
+    {
+        bHandled = true;
+        if( it->second->m_aRequestedType == m_nMULTIPLEAtom )
+        {
+            Atom nType = None;
+            int nFormat = 0;
+            unsigned long nItems = 0, nBytes = 0;
+            unsigned char* pData = nullptr;
+
+            // get type and length
+            XGetWindowProperty( m_pDisplay,
+                                rNotify.requestor,
+                                rNotify.property,
+                                0, 256,
+                                False,
+                                AnyPropertyType,
+                                &nType, &nFormat,
+                                &nItems, &nBytes,
+                                &pData );
+            if( nBytes ) // HUGE request !!!
+            {
+                if( pData )
+                    XFree( pData );
+                XGetWindowProperty( m_pDisplay,
+                                    rNotify.requestor,
+                                    rNotify.property,
+                                    0, 256+(nBytes+3)/4,
+                                    False,
+                                    AnyPropertyType,
+                                    &nType, &nFormat,
+                                    &nItems, &nBytes,
+                                    &pData );
+            }
+            it->second->m_eState        = Selection::Inactive;
+            std::size_t nUnitSize = GetTrueFormatSize(nFormat);
+            it->second->m_aData         = Sequence< sal_Int8 >(reinterpret_cast<sal_Int8*>(pData), nItems * nUnitSize);
+            it->second->m_aDataArrived.set();
+            if( pData )
+                XFree( pData );
+        }
+        // WaitingForData can actually happen; some
+        // applications (e.g. cmdtool on Solaris) first send
+        // a success and then cancel it. Weird !
+        else if( rNotify.property == None )
+        {
+            // conversion failed, stop transfer
+            it->second->m_eState        = Selection::Inactive;
+            it->second->m_aData         = Sequence< sal_Int8 >();
+            it->second->m_aDataArrived.set();
+        }
+        // get the bytes, by INCR if necessary
+        else
+            it->second->m_eState = Selection::WaitingForData;
+    }
+#if OSL_DEBUG_LEVEL > 1
+    else if( it != m_aSelections.end() )
+        SAL_WARN("vcl.unx.dtrans", "selection in state " << it->second->m_eState);
+#endif
+    return bHandled;
+}
+
+bool SelectionManager::handleDropEvent( XClientMessageEvent const & rMessage )
+{
+    osl::ResettableMutexGuard aGuard(m_aMutex);
+
+    // handle drop related events
+    ::Window aSource = rMessage.data.l[0];
+    ::Window aTarget = rMessage.window;
+
+    bool bHandled = false;
+
+    std::unordered_map< ::Window, DropTargetEntry >::iterator it =
+          m_aDropTargets.find( aTarget );
+
+#if OSL_DEBUG_LEVEL > 1
+    if( rMessage.message_type == m_nXdndEnter     ||
+        rMessage.message_type == m_nXdndLeave     ||
+        rMessage.message_type == m_nXdndDrop      ||
+        rMessage.message_type == m_nXdndPosition  )
+    {
+        std::ostringstream oss;
+        oss << "got drop event "
+            << getString( rMessage.message_type )
+            << ", ";
+
+        if( it == m_aDropTargets.end() )
+            oss << "but no target found.";
+        else if( ! it->second.m_pTarget->m_bActive )
+            oss << "but target is inactive.";
+        else if( m_aDropEnterEvent.data.l[0] != None && (::Window)m_aDropEnterEvent.data.l[0] != aSource )
+            oss << "but source "
+                << std::showbase << std::hex
+                << aSource
+                << " is unknown (expected "
+                << m_aDropEnterEvent.data.l[0]
+                << " or 0).";
+        else
+            oss << "processing.";
+        SAL_INFO("vcl.unx.dtrans", oss.str());
+    }
+#endif
+
+    if( it != m_aDropTargets.end() && it->second.m_pTarget->m_bActive &&
+        m_bDropWaitingForCompletion && m_aDropEnterEvent.data.l[0] )
+    {
+        bHandled = true;
+        OSL_FAIL( "someone forgot to call dropComplete ?" );
+        // some listener forgot to call dropComplete in the last operation
+        // let us end it now and accept the new enter event
+        aGuard.clear();
+        dropComplete( false, m_aCurrentDropWindow );
+        aGuard.reset();
+    }
+
+    if( it != m_aDropTargets.end() &&
+        it->second.m_pTarget->m_bActive &&
+       ( m_aDropEnterEvent.data.l[0] == None || ::Window(m_aDropEnterEvent.data.l[0]) == aSource )
+        )
+    {
+        if( rMessage.message_type == m_nXdndEnter )
+        {
+            bHandled = true;
+            m_aDropEnterEvent           = rMessage;
+            m_bDropEnterSent            = false;
+            m_aCurrentDropWindow        = aTarget;
+            m_nCurrentProtocolVersion   = m_aDropEnterEvent.data.l[1] >> 24;
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "received XdndEnter on "
+                    << std::showbase << std::hex
+                    << aTarget);
+#endif
+        }
+        else if(
+                rMessage.message_type == m_nXdndPosition &&
+                aSource == ::Window(m_aDropEnterEvent.data.l[0])
+                )
+        {
+            bHandled = true;
+            m_nDropTime = m_nCurrentProtocolVersion > 0 ? rMessage.data.l[3] : CurrentTime;
+
+            ::Window aChild;
+            XTranslateCoordinates( m_pDisplay,
+                                   it->second.m_aRootWindow,
+                                   it->first,
+                                   rMessage.data.l[2] >> 16,
+                                   rMessage.data.l[2] & 0xffff,
+                                   &m_nLastX, &m_nLastY,
+                                   &aChild );
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "received XdndPosition on "
+                    << std::showbase << std::hex
+                    << aTarget
+                    << " ("
+                    << std::dec
+                    << m_nLastX
+                    << ", "
+                    << m_nLastY
+                    << ").");
+#endif
+            DropTargetDragEnterEvent aEvent;
+            aEvent.Source       = static_cast< XDropTarget* >(it->second.m_pTarget);
+            aEvent.Context      = new DropTargetDragContext( m_aCurrentDropWindow, *this );
+            aEvent.LocationX    = m_nLastX;
+            aEvent.LocationY    = m_nLastY;
+            aEvent.SourceActions = m_nSourceActions;
+            if( m_nCurrentProtocolVersion < 2 )
+                aEvent.DropAction = DNDConstants::ACTION_COPY;
+            else if( Atom(rMessage.data.l[4]) == m_nXdndActionCopy )
+                aEvent.DropAction = DNDConstants::ACTION_COPY;
+            else if( Atom(rMessage.data.l[4]) == m_nXdndActionMove )
+                aEvent.DropAction = DNDConstants::ACTION_MOVE;
+            else if( Atom(rMessage.data.l[4]) == m_nXdndActionLink )
+                aEvent.DropAction = DNDConstants::ACTION_LINK;
+            else if( Atom(rMessage.data.l[4]) == m_nXdndActionAsk )
+                // currently no interface to implement ask
+                aEvent.DropAction = ~0;
+            else
+                aEvent.DropAction = DNDConstants::ACTION_NONE;
+
+            m_nLastDropAction   = aEvent.DropAction;
+            if( ! m_bDropEnterSent )
+            {
+                m_bDropEnterSent = true;
+                aEvent.SupportedDataFlavors = m_xDropTransferable->getTransferDataFlavors();
+                aGuard.clear();
+                it->second->dragEnter( aEvent );
+            }
+            else
+            {
+                aGuard.clear();
+                it->second->dragOver( aEvent );
+            }
+        }
+        else if(
+                rMessage.message_type == m_nXdndLeave  &&
+                aSource == ::Window(m_aDropEnterEvent.data.l[0])
+                )
+        {
+            bHandled = true;
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "received XdndLeave on "
+                    << std::showbase << std::hex
+                    << aTarget);
+#endif
+            DropTargetEvent aEvent;
+            aEvent.Source = static_cast< XDropTarget* >(it->second.m_pTarget);
+            m_aDropEnterEvent.data.l[0] = None;
+            if( m_aCurrentDropWindow == aTarget )
+                m_aCurrentDropWindow = None;
+            m_nCurrentProtocolVersion = nXdndProtocolRevision;
+            aGuard.clear();
+            it->second->dragExit( aEvent );
+        }
+        else if(
+                rMessage.message_type == m_nXdndDrop &&
+                aSource == ::Window(m_aDropEnterEvent.data.l[0])
+                )
+        {
+            bHandled = true;
+            m_nDropTime = m_nCurrentProtocolVersion > 0 ? rMessage.data.l[2] : CurrentTime;
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "received XdndDrop on "
+                    << std::showbase << std::hex
+                    << aTarget
+                    << " ("
+                    << m_nLastX
+                    << ", "
+                    << m_nLastY
+                    << ").");
+#endif
+            if( m_bLastDropAccepted )
+            {
+                DropTargetDropEvent aEvent;
+                aEvent.Source       = static_cast< XDropTarget* >(it->second.m_pTarget);
+                aEvent.Context      = new DropTargetDropContext( m_aCurrentDropWindow, *this );
+                aEvent.LocationX    = m_nLastX;
+                aEvent.LocationY    = m_nLastY;
+                aEvent.DropAction   = m_nLastDropAction;
+                // there is nothing corresponding to source supported actions
+                // every source can do link, copy and move
+                aEvent.SourceActions= m_nLastDropAction;
+                aEvent.Transferable = m_xDropTransferable;
+
+                m_bDropWaitingForCompletion = true;
+                aGuard.clear();
+                it->second->drop( aEvent );
+            }
+            else
+            {
+#if OSL_DEBUG_LEVEL > 1
+                SAL_INFO("vcl.unx.dtrans", "XdndDrop canceled due to "
+                        << "m_bLastDropAccepted = false." );
+#endif
+                DropTargetEvent aEvent;
+                aEvent.Source = static_cast< XDropTarget* >(it->second.m_pTarget);
+                aGuard.clear();
+                it->second->dragExit( aEvent );
+                // reset the drop status, notify source
+                dropComplete( false, m_aCurrentDropWindow );
+            }
+        }
+    }
+    return bHandled;
+}
+
+/*
+ *  methods for XDropTargetDropContext
+ */
+
+void SelectionManager::dropComplete( bool bSuccess, ::Window aDropWindow )
+{
+    osl::ClearableMutexGuard aGuard(m_aMutex);
+
+    if( aDropWindow == m_aCurrentDropWindow )
+    {
+        if( m_xDragSourceListener.is() )
+        {
+            DragSourceDropEvent dsde;
+            dsde.Source             = static_cast< OWeakObject* >(this);
+            dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+            dsde.DragSource         = static_cast< XDragSource* >(this);
+            dsde.DropAction         = getUserDragAction();
+            dsde.DropSuccess        = bSuccess;
+            css::uno::Reference< XDragSourceListener > xListener = m_xDragSourceListener;
+            m_xDragSourceListener.clear();
+
+            aGuard.clear();
+            xListener->dragDropEnd( dsde );
+        }
+        else if( m_aDropEnterEvent.data.l[0] && m_aCurrentDropWindow )
+        {
+            XEvent aEvent;
+            aEvent.xclient.type         = ClientMessage;
+            aEvent.xclient.display      = m_pDisplay;
+            aEvent.xclient.window       = m_aDropEnterEvent.data.l[0];
+            aEvent.xclient.message_type = m_nXdndFinished;
+            aEvent.xclient.format       = 32;
+            aEvent.xclient.data.l[0]    = m_aCurrentDropWindow;
+            aEvent.xclient.data.l[1]    = bSuccess ? 1 : 0;
+            aEvent.xclient.data.l[2]    = 0;
+            aEvent.xclient.data.l[3]    = 0;
+            aEvent.xclient.data.l[4]    = 0;
+            if( bSuccess )
+            {
+                if( m_nLastDropAction & DNDConstants::ACTION_MOVE )
+                    aEvent.xclient.data.l[2] = m_nXdndActionMove;
+                else if( m_nLastDropAction & DNDConstants::ACTION_COPY )
+                    aEvent.xclient.data.l[2] = m_nXdndActionCopy;
+                else if( m_nLastDropAction & DNDConstants::ACTION_LINK )
+                    aEvent.xclient.data.l[2] = m_nXdndActionLink;
+            }
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "Sending XdndFinished to "
+                    << std::showbase << std::hex
+                    << m_aDropEnterEvent.data.l[0]);
+#endif
+            XSendEvent( m_pDisplay, m_aDropEnterEvent.data.l[0],
+                        False, NoEventMask, & aEvent );
+
+            m_aDropEnterEvent.data.l[0] = None;
+            m_aCurrentDropWindow        = None;
+            m_nCurrentProtocolVersion   = nXdndProtocolRevision;
+        }
+        m_bDropWaitingForCompletion = false;
+    }
+    else
+        OSL_FAIL( "dropComplete from invalid DropTargetDropContext" );
+}
+
+/*
+ *  methods for XDropTargetDragContext
+ */
+
+void SelectionManager::sendDragStatus( Atom nDropAction )
+{
+    osl::ClearableMutexGuard aGuard(m_aMutex);
+
+    if( m_xDragSourceListener.is() )
+    {
+        sal_Int8 nNewDragAction;
+        if( nDropAction == m_nXdndActionMove )
+            nNewDragAction = DNDConstants::ACTION_MOVE;
+        else if( nDropAction == m_nXdndActionCopy )
+            nNewDragAction = DNDConstants::ACTION_COPY;
+        else if( nDropAction == m_nXdndActionLink )
+            nNewDragAction = DNDConstants::ACTION_LINK;
+        else
+            nNewDragAction = DNDConstants::ACTION_NONE;
+        nNewDragAction &= m_nSourceActions;
+
+        if( nNewDragAction != m_nTargetAcceptAction )
+        {
+            setCursor( getDefaultCursor( nNewDragAction ), m_aDropWindow );
+            m_nTargetAcceptAction = nNewDragAction;
+        }
+
+        DragSourceDragEvent dsde;
+        dsde.Source             = static_cast< OWeakObject* >(this);
+        dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+        dsde.DragSource         = static_cast< XDragSource* >(this);
+        dsde.DropAction         = m_nSourceActions;
+        dsde.UserAction         = getUserDragAction();
+
+        css::uno::Reference< XDragSourceListener > xListener( m_xDragSourceListener );
+        // caution: do not change anything after this
+        aGuard.clear();
+        if( xListener.is() )
+            xListener->dragOver( dsde );
+    }
+    else if( m_aDropEnterEvent.data.l[0] && m_aCurrentDropWindow )
+    {
+        XEvent aEvent;
+        aEvent.xclient.type         = ClientMessage;
+        aEvent.xclient.display      = m_pDisplay;
+        aEvent.xclient.window       = m_aDropEnterEvent.data.l[0];
+        aEvent.xclient.message_type = m_nXdndStatus;
+        aEvent.xclient.format       = 32;
+        aEvent.xclient.data.l[0]    = m_aCurrentDropWindow;
+        aEvent.xclient.data.l[1]    = 2;
+        if( nDropAction == m_nXdndActionMove    ||
+            nDropAction == m_nXdndActionLink    ||
+            nDropAction == m_nXdndActionCopy )
+            aEvent.xclient.data.l[1] |= 1;
+        aEvent.xclient.data.l[2] = 0;
+        aEvent.xclient.data.l[3] = 0;
+        aEvent.xclient.data.l[4] = m_nCurrentProtocolVersion > 1 ? nDropAction : 0;
+
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "Sending XdndStatus to "
+                << std::showbase << std::hex
+                << m_aDropEnterEvent.data.l[0]
+                << " with action "
+                << getString( nDropAction ));
+#endif
+
+        XSendEvent( m_pDisplay, m_aDropEnterEvent.data.l[0],
+                    False, NoEventMask, & aEvent );
+        XFlush( m_pDisplay );
+    }
+}
+
+sal_Int8 SelectionManager::getUserDragAction() const
+{
+    return (m_nTargetAcceptAction != DNDConstants::ACTION_DEFAULT) ? m_nTargetAcceptAction : m_nUserDragAction;
+}
+
+bool SelectionManager::updateDragAction( int modifierState )
+{
+    bool bRet = false;
+
+    sal_Int8 nNewDropAction = DNDConstants::ACTION_MOVE;
+    if( ( modifierState & ShiftMask ) && ! ( modifierState & ControlMask ) )
+        nNewDropAction = DNDConstants::ACTION_MOVE;
+    else if( ( modifierState & ControlMask ) && ! ( modifierState & ShiftMask ) )
+        nNewDropAction = DNDConstants::ACTION_COPY;
+    else if( ( modifierState & ShiftMask ) && ( modifierState & ControlMask ) )
+        nNewDropAction = DNDConstants::ACTION_LINK;
+    if( m_nCurrentProtocolVersion < 0 && m_aDropWindow != None )
+        nNewDropAction = DNDConstants::ACTION_COPY;
+    nNewDropAction &= m_nSourceActions;
+
+    if( ! ( modifierState & ( ControlMask | ShiftMask ) ) )
+    {
+        if( ! nNewDropAction )
+        {
+            // default to an action so the user does not have to press
+            // keys explicitly
+            if( m_nSourceActions & DNDConstants::ACTION_MOVE )
+                nNewDropAction = DNDConstants::ACTION_MOVE;
+            else if( m_nSourceActions & DNDConstants::ACTION_COPY )
+                nNewDropAction = DNDConstants::ACTION_COPY;
+            else if( m_nSourceActions & DNDConstants::ACTION_LINK )
+                nNewDropAction = DNDConstants::ACTION_LINK;
+        }
+        nNewDropAction |= DNDConstants::ACTION_DEFAULT;
+    }
+
+    if( nNewDropAction != m_nUserDragAction || m_nTargetAcceptAction != DNDConstants::ACTION_DEFAULT )
+    {
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "updateDragAction: "
+                << std::hex
+                << (int)m_nUserDragAction
+                << " -> "
+                << (int)nNewDropAction);
+#endif
+        bRet = true;
+        m_nUserDragAction = nNewDropAction;
+
+        DragSourceDragEvent dsde;
+        dsde.Source             = static_cast< OWeakObject* >(this);
+        dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+        dsde.DragSource         = static_cast< XDragSource* >(this);
+        dsde.DropAction         = m_nUserDragAction;
+        dsde.UserAction         = m_nUserDragAction;
+        m_nTargetAcceptAction   = DNDConstants::ACTION_DEFAULT; // invalidate last accept
+        m_xDragSourceListener->dropActionChanged( dsde );
+    }
+    return bRet;
+}
+
+void SelectionManager::sendDropPosition( bool bForce, Time eventTime )
+{
+    osl::ClearableMutexGuard aGuard(m_aMutex);
+
+    if( m_bDropSent )
+        return;
+
+    std::unordered_map< ::Window, DropTargetEntry >::const_iterator it =
+          m_aDropTargets.find( m_aDropWindow );
+    if( it != m_aDropTargets.end() )
+    {
+        if( it->second.m_pTarget->m_bActive )
+        {
+            int x, y;
+            ::Window aChild;
+            XTranslateCoordinates( m_pDisplay, it->second.m_aRootWindow, m_aDropWindow, m_nLastDragX, m_nLastDragY, &x, &y, &aChild );
+            DropTargetDragEvent dtde;
+            dtde.Source         = static_cast< OWeakObject* >(it->second.m_pTarget );
+            dtde.Context        = new DropTargetDragContext( m_aCurrentDropWindow, *this );
+            dtde.LocationX      = x;
+            dtde.LocationY      = y;
+            dtde.DropAction     = getUserDragAction();
+            dtde.SourceActions  = m_nSourceActions;
+            aGuard.clear();
+            it->second->dragOver( dtde );
+        }
+    }
+    else if( bForce ||
+
+             m_nLastDragX < m_nNoPosX || m_nLastDragX >= m_nNoPosX+m_nNoPosWidth ||
+             m_nLastDragY < m_nNoPosY || m_nLastDragY >= m_nNoPosY+m_nNoPosHeight
+             )
+    {
+        // send XdndPosition
+        XEvent aEvent;
+        aEvent.type = ClientMessage;
+        aEvent.xclient.display      = m_pDisplay;
+        aEvent.xclient.format       = 32;
+        aEvent.xclient.message_type = m_nXdndPosition;
+        aEvent.xclient.window       = m_aDropWindow;
+        aEvent.xclient.data.l[0]    = m_aWindow;
+        aEvent.xclient.data.l[1]    = 0;
+        aEvent.xclient.data.l[2]    = m_nLastDragX << 16 | (m_nLastDragY&0xffff);
+        aEvent.xclient.data.l[3]    = eventTime;
+
+        if( m_nUserDragAction & DNDConstants::ACTION_COPY )
+            aEvent.xclient.data.l[4]=m_nXdndActionCopy;
+        else if( m_nUserDragAction & DNDConstants::ACTION_MOVE )
+            aEvent.xclient.data.l[4]=m_nXdndActionMove;
+        else if( m_nUserDragAction & DNDConstants::ACTION_LINK )
+            aEvent.xclient.data.l[4]=m_nXdndActionLink;
+        else
+            aEvent.xclient.data.l[4]=m_nXdndActionCopy;
+        XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+        m_nNoPosX = m_nNoPosY = m_nNoPosWidth = m_nNoPosHeight = 0;
+    }
+}
+
+bool SelectionManager::handleDragEvent( XEvent const & rMessage )
+{
+    if( ! m_xDragSourceListener.is() )
+        return false;
+
+    osl::ResettableMutexGuard aGuard(m_aMutex);
+
+    bool bHandled = false;
+
+    // for shortcut
+    std::unordered_map< ::Window, DropTargetEntry >::const_iterator it =
+          m_aDropTargets.find( m_aDropWindow );
+
+#if OSL_DEBUG_LEVEL > 1
+    switch( rMessage.type )
+    {
+        case ClientMessage:
+            SAL_INFO("vcl.unx.dtrans", "handleDragEvent: "
+                    << getString( rMessage.xclient.message_type ));
+            break;
+        case MotionNotify:
+            break;
+        case EnterNotify:
+            SAL_INFO("vcl.unx.dtrans", "handleDragEvent: EnterNotify.");
+            break;
+        case LeaveNotify:
+            SAL_INFO("vcl.unx.dtrans", "handleDragEvent: LeaveNotify.");
+            break;
+        case ButtonPress:
+            SAL_INFO("vcl.unx.dtrans", "handleDragEvent: ButtonPress "
+                    << rMessage.xbutton.button
+                    << " (m_nDragButton = "
+                    << m_nDragButton
+                    << ").");
+            break;
+        case ButtonRelease:
+            SAL_INFO("vcl.unx.dtrans", "handleDragEvent: ButtonRelease "
+                    << rMessage.xbutton.button
+                    << " (m_nDragButton = "
+                    << m_nDragButton
+                    << ").");
+            break;
+        case KeyPress:
+            SAL_INFO("vcl.unx.dtrans", "handleDragEvent: KeyPress.");
+            break;
+        case KeyRelease:
+            SAL_INFO("vcl.unx.dtrans", "handleDragEvent: KeyRelease.");
+            break;
+        default:
+            SAL_INFO("vcl.unx.dtrans", "handleDragEvent: <unknown type "
+                    << rMessage.type
+                    << ">.");
+            break;
+    }
+#endif
+
+    // handle drag related events
+    if( rMessage.type == ClientMessage )
+    {
+        if( rMessage.xclient.message_type == m_nXdndStatus && Atom(rMessage.xclient.data.l[0]) == m_aDropWindow )
+        {
+            bHandled = true;
+            DragSourceDragEvent dsde;
+            dsde.Source                 = static_cast< OWeakObject* >(this);
+            dsde.DragSourceContext      = new DragSourceContext( m_aDropWindow, *this );
+            dsde.DragSource             = static_cast< XDragSource* >( this );
+            dsde.UserAction = getUserDragAction();
+            dsde.DropAction = DNDConstants::ACTION_NONE;
+            m_bDropSuccess = (rMessage.xclient.data.l[1] & 1) != 0;
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "status drop action: accept = "
+                    << (m_bDropSuccess ? "true" : "false")
+                    << ", "
+                    << getString( rMessage.xclient.data.l[4] ));
+#endif
+            if( rMessage.xclient.data.l[1] & 1 )
+            {
+                if( m_nCurrentProtocolVersion > 1 )
+                {
+                    if( Atom(rMessage.xclient.data.l[4]) == m_nXdndActionCopy )
+                        dsde.DropAction = DNDConstants::ACTION_COPY;
+                    else if( Atom(rMessage.xclient.data.l[4]) == m_nXdndActionMove )
+                        dsde.DropAction = DNDConstants::ACTION_MOVE;
+                    else if( Atom(rMessage.xclient.data.l[4]) == m_nXdndActionLink )
+                        dsde.DropAction = DNDConstants::ACTION_LINK;
+                }
+                else
+                    dsde.DropAction = DNDConstants::ACTION_COPY;
+            }
+            m_nTargetAcceptAction = dsde.DropAction;
+
+            if( ! ( rMessage.xclient.data.l[1] & 2 ) )
+            {
+                m_nNoPosX       = rMessage.xclient.data.l[2] >> 16;
+                m_nNoPosY       = rMessage.xclient.data.l[2] & 0xffff;
+                m_nNoPosWidth   = rMessage.xclient.data.l[3] >> 16;
+                m_nNoPosHeight  = rMessage.xclient.data.l[3] & 0xffff;
+            }
+            else
+                m_nNoPosX = m_nNoPosY = m_nNoPosWidth = m_nNoPosHeight = 0;
+
+            setCursor( getDefaultCursor( dsde.DropAction ), m_aDropWindow );
+            aGuard.clear();
+            m_xDragSourceListener->dragOver( dsde );
+        }
+        else if( rMessage.xclient.message_type == m_nXdndFinished && m_aDropWindow == Atom(rMessage.xclient.data.l[0]) )
+        {
+            bHandled = true;
+            // notify the listener
+            DragSourceDropEvent dsde;
+            dsde.Source             = static_cast< OWeakObject* >(this);
+            dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+            dsde.DragSource         = static_cast< XDragSource* >(this);
+            dsde.DropAction         = m_nTargetAcceptAction;
+            dsde.DropSuccess        = m_bDropSuccess;
+            css::uno::Reference< XDragSourceListener > xListener( m_xDragSourceListener );
+            m_xDragSourceListener.clear();
+            aGuard.clear();
+            xListener->dragDropEnd( dsde );
+        }
+    }
+    else if( rMessage.type == MotionNotify ||
+             rMessage.type == EnterNotify || rMessage.type == LeaveNotify
+             )
+    {
+        bHandled = true;
+        bool bForce = false;
+        int root_x  = rMessage.type == MotionNotify ? rMessage.xmotion.x_root : rMessage.xcrossing.x_root;
+        int root_y  = rMessage.type == MotionNotify ? rMessage.xmotion.y_root : rMessage.xcrossing.y_root;
+        ::Window root = rMessage.type == MotionNotify ? rMessage.xmotion.root : rMessage.xcrossing.root;
+
+        aGuard.clear();
+        if( rMessage.type == MotionNotify )
+        {
+            bForce = updateDragAction( rMessage.xmotion.state );
+        }
+        updateDragWindow( root_x, root_y, root );
+        aGuard.reset();
+
+        if( m_nCurrentProtocolVersion >= 0 && m_aDropProxy != None )
+        {
+            aGuard.clear();
+            sendDropPosition( bForce, rMessage.type == MotionNotify ? rMessage.xmotion.time : rMessage.xcrossing.time );
+        }
+    }
+    else if( rMessage.type == KeyPress || rMessage.type == KeyRelease )
+    {
+        bHandled = true;
+        KeySym aKey = XkbKeycodeToKeysym( m_pDisplay, rMessage.xkey.keycode, 0, 0 );
+        if( aKey == XK_Escape )
+        {
+            // abort drag
+            if( it != m_aDropTargets.end() )
+            {
+                DropTargetEvent dte;
+                dte.Source = static_cast< OWeakObject* >( it->second.m_pTarget );
+                aGuard.clear();
+                it->second.m_pTarget->dragExit( dte );
+                aGuard.reset();
+            }
+            else if( m_aDropProxy != None && m_nCurrentProtocolVersion >= 0 )
+            {
+                // send XdndLeave
+                XEvent aEvent;
+                aEvent.type = ClientMessage;
+                aEvent.xclient.display      = m_pDisplay;
+                aEvent.xclient.format       = 32;
+                aEvent.xclient.message_type = m_nXdndLeave;
+                aEvent.xclient.window       = m_aDropWindow;
+                aEvent.xclient.data.l[0]    = m_aWindow;
+                memset( aEvent.xclient.data.l+1, 0, sizeof(long)*4);
+                m_aDropWindow = m_aDropProxy = None;
+                XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+            }
+            // notify the listener
+            DragSourceDropEvent dsde;
+            dsde.Source             = static_cast< OWeakObject* >(this);
+            dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+            dsde.DragSource         = static_cast< XDragSource* >(this);
+            dsde.DropAction         = DNDConstants::ACTION_NONE;
+            dsde.DropSuccess        = false;
+            css::uno::Reference< XDragSourceListener > xListener( m_xDragSourceListener );
+            m_xDragSourceListener.clear();
+            aGuard.clear();
+            xListener->dragDropEnd( dsde );
+        }
+        else
+        {
+            /*
+             *  man page says: state is state immediate PRIOR to the
+             *  event. It would seem that this is a somewhat arguable
+             *  design decision.
+             */
+            int nState = rMessage.xkey.state;
+            int nNewState = 0;
+            switch( aKey )
+            {
+                case XK_Shift_R:
+                case XK_Shift_L: nNewState = ShiftMask;break;
+                case XK_Control_R:
+                case XK_Control_L: nNewState = ControlMask;break;
+                    // just interested in shift and ctrl for dnd
+            }
+            if( rMessage.type == KeyPress )
+                nState |= nNewState;
+            else
+                nState &= ~nNewState;
+            aGuard.clear();
+            if( updateDragAction( nState ) )
+                sendDropPosition( true, rMessage.xkey.time );
+        }
+    }
+    else if(
+            ( rMessage.type == ButtonPress || rMessage.type == ButtonRelease ) &&
+            rMessage.xbutton.button == m_nDragButton )
+    {
+        bool bCancel = true;
+        if( m_aDropWindow != None )
+        {
+            if( it != m_aDropTargets.end() )
+            {
+                if( it->second.m_pTarget->m_bActive && m_nUserDragAction != DNDConstants::ACTION_NONE && m_bLastDropAccepted )
+                {
+                    bHandled = true;
+                    int x, y;
+                    ::Window aChild;
+                    XTranslateCoordinates( m_pDisplay, rMessage.xbutton.root, m_aDropWindow, rMessage.xbutton.x_root, rMessage.xbutton.y_root, &x, &y, &aChild );
+                    DropTargetDropEvent dtde;
+                    dtde.Source         = static_cast< OWeakObject* >(it->second.m_pTarget );
+                    dtde.Context        = new DropTargetDropContext( m_aCurrentDropWindow, *this );
+                    dtde.LocationX      = x;
+                    dtde.LocationY      = y;
+                    dtde.DropAction     = m_nUserDragAction;
+                    dtde.SourceActions  = m_nSourceActions;
+                    dtde.Transferable   = m_xDragSourceTransferable;
+                    m_bDropSent                 = true;
+                    m_nDropTimeout              = time( nullptr );
+                    m_bDropWaitingForCompletion = true;
+                    aGuard.clear();
+                    it->second->drop( dtde );
+                    bCancel = false;
+                }
+                else bCancel = true;
+            }
+            else if( m_nCurrentProtocolVersion >= 0 )
+            {
+                bHandled = true;
+
+                XEvent aEvent;
+                aEvent.type = ClientMessage;
+                aEvent.xclient.display      = m_pDisplay;
+                aEvent.xclient.format       = 32;
+                aEvent.xclient.message_type = m_nXdndDrop;
+                aEvent.xclient.window       = m_aDropWindow;
+                aEvent.xclient.data.l[0]    = m_aWindow;
+                aEvent.xclient.data.l[1]    = 0;
+                aEvent.xclient.data.l[2]    = rMessage.xbutton.time;
+                aEvent.xclient.data.l[3]    = 0;
+                aEvent.xclient.data.l[4]    = 0;
+
+                m_bDropSent                 = true;
+                m_nDropTimeout              = time( nullptr );
+                XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+                bCancel = false;
+            }
+            else
+            {
+                // dropping on non XdndWindows: acquire ownership of
+                // PRIMARY and send a middle mouse button click down/up to
+                // target window
+                SelectionAdaptor* pAdaptor = getAdaptor( XA_PRIMARY );
+                if( pAdaptor )
+                {
+                    bHandled = true;
+
+                    ::Window aDummy;
+                    XEvent aEvent;
+                    aEvent.type = ButtonPress;
+                    aEvent.xbutton.display      = m_pDisplay;
+                    aEvent.xbutton.window       = m_aDropWindow;
+                    aEvent.xbutton.root         = rMessage.xbutton.root;
+                    aEvent.xbutton.subwindow    = m_aDropWindow;
+                    aEvent.xbutton.time         = rMessage.xbutton.time+1;
+                    aEvent.xbutton.x_root       = rMessage.xbutton.x_root;
+                    aEvent.xbutton.y_root       = rMessage.xbutton.y_root;
+                    aEvent.xbutton.state        = rMessage.xbutton.state;
+                    aEvent.xbutton.button       = Button2;
+                    aEvent.xbutton.same_screen  = True;
+                    XTranslateCoordinates( m_pDisplay,
+                                           rMessage.xbutton.root, m_aDropWindow,
+                                           rMessage.xbutton.x_root, rMessage.xbutton.y_root,
+                                           &aEvent.xbutton.x, &aEvent.xbutton.y,
+                                           &aDummy );
+                    XSendEvent( m_pDisplay, m_aDropWindow, False, ButtonPressMask, &aEvent );
+                    aEvent.xbutton.type   = ButtonRelease;
+                    aEvent.xbutton.time++;
+                    aEvent.xbutton.state |= Button2Mask;
+                    XSendEvent( m_pDisplay, m_aDropWindow, False, ButtonReleaseMask, &aEvent );
+
+                    m_bDropSent                 = true;
+                    m_nDropTimeout              = time( nullptr );
+                    XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+                    m_bWaitingForPrimaryConversion  = true;
+                    m_bDropSent                     = true;
+                    m_nDropTimeout                  = time( nullptr );
+                    // HACK :-)
+                    aGuard.clear();
+                    static_cast< X11Clipboard* >( pAdaptor )->setContents( m_xDragSourceTransferable, css::uno::Reference< css::datatransfer::clipboard::XClipboardOwner >() );
+                    aGuard.reset();
+                    bCancel = false;
+                }
+            }
+        }
+        if( bCancel )
+        {
+            // cancel drag
+            DragSourceDropEvent dsde;
+            dsde.Source             = static_cast< OWeakObject* >(this);
+            dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+            dsde.DragSource         = static_cast< XDragSource* >(this);
+            dsde.DropAction         = DNDConstants::ACTION_NONE;
+            dsde.DropSuccess        = false;
+            css::uno::Reference< XDragSourceListener > xListener( m_xDragSourceListener );
+            m_xDragSourceListener.clear();
+            aGuard.clear();
+            xListener->dragDropEnd( dsde );
+            bHandled = true;
+        }
+    }
+    return bHandled;
+}
+
+void SelectionManager::accept( sal_Int8 dragOperation, ::Window aDropWindow )
+{
+    if( aDropWindow == m_aCurrentDropWindow )
+    {
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "accept: " << std::hex << dragOperation);
+#endif
+        Atom nAction = None;
+        dragOperation &= (DNDConstants::ACTION_MOVE | DNDConstants::ACTION_COPY | DNDConstants::ACTION_LINK);
+        if( dragOperation & DNDConstants::ACTION_MOVE )
+            nAction = m_nXdndActionMove;
+        else if( dragOperation & DNDConstants::ACTION_COPY )
+            nAction = m_nXdndActionCopy;
+        else if( dragOperation & DNDConstants::ACTION_LINK )
+            nAction = m_nXdndActionLink;
+        m_bLastDropAccepted = true;
+        sendDragStatus( nAction );
+    }
+}
+
+void SelectionManager::reject( ::Window aDropWindow )
+{
+    if( aDropWindow == m_aCurrentDropWindow )
+    {
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "reject.");
+#endif
+        m_bLastDropAccepted = false;
+        sendDragStatus( None );
+        if( m_bDropSent && m_xDragSourceListener.is() )
+        {
+            DragSourceDropEvent dsde;
+            dsde.Source             = static_cast< OWeakObject* >(this);
+            dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+            dsde.DragSource         = static_cast< XDragSource* >(this);
+            dsde.DropAction         = DNDConstants::ACTION_NONE;
+            dsde.DropSuccess        = false;
+            m_xDragSourceListener->dragDropEnd( dsde );
+            m_xDragSourceListener.clear();
+        }
+    }
+}
+
+/*
+ *  XDragSource
+ */
+
+sal_Bool SelectionManager::isDragImageSupported()
+{
+    return false;
+}
+
+sal_Int32 SelectionManager::getDefaultCursor( sal_Int8 dragAction )
+{
+    Cursor aCursor = m_aNoneCursor;
+    if( dragAction & DNDConstants::ACTION_MOVE )
+        aCursor = m_aMoveCursor;
+    else if( dragAction & DNDConstants::ACTION_COPY )
+        aCursor = m_aCopyCursor;
+    else if( dragAction & DNDConstants::ACTION_LINK )
+        aCursor = m_aLinkCursor;
+    return aCursor;
+}
+
+int SelectionManager::getXdndVersion( ::Window aWindow, ::Window& rProxy )
+{
+    Atom* pProperties = nullptr;
+    int nProperties = 0;
+    Atom nType;
+    int nFormat;
+    unsigned long nItems, nBytes;
+    unsigned char* pBytes = nullptr;
+
+    int nVersion = -1;
+    rProxy = None;
+
+    /*
+     *  XListProperties is used here to avoid unnecessary XGetWindowProperty calls
+     *  and therefore reducing latency penalty
+     */
+    pProperties = XListProperties( m_pDisplay, aWindow, &nProperties );
+    // first look for proxy
+    int i;
+    for( i = 0; i < nProperties; i++ )
+    {
+        if( pProperties[i] == m_nXdndProxy )
+        {
+            XGetWindowProperty( m_pDisplay, aWindow, m_nXdndProxy, 0, 1, False, XA_WINDOW,
+                                &nType, &nFormat, &nItems, &nBytes, &pBytes );
+            if( pBytes )
+            {
+                if( nType == XA_WINDOW )
+                    rProxy = *reinterpret_cast< ::Window* >(pBytes);
+                XFree( pBytes );
+                pBytes = nullptr;
+                if( rProxy != None )
+                {
+                    // now check proxy whether it points to itself
+                    XGetWindowProperty( m_pDisplay, rProxy, m_nXdndProxy, 0, 1, False, XA_WINDOW,
+                                        &nType, &nFormat, &nItems, &nBytes, &pBytes );
+                    if( pBytes )
+                    {
+                        if( nType == XA_WINDOW && *reinterpret_cast< ::Window* >(pBytes) != rProxy )
+                            rProxy = None;
+                        XFree( pBytes );
+                        pBytes = nullptr;
+                    }
+                    else
+                        rProxy = None;
+                }
+            }
+            break;
+        }
+    }
+    if ( pProperties )
+        XFree (pProperties);
+
+    ::Window aAwareWindow = rProxy != None ? rProxy : aWindow;
+
+    XGetWindowProperty( m_pDisplay, aAwareWindow, m_nXdndAware, 0, 1, False, XA_ATOM,
+                        &nType, &nFormat, &nItems, &nBytes, &pBytes );
+    if( pBytes )
+    {
+        if( nType == XA_ATOM )
+            nVersion = *reinterpret_cast<Atom*>(pBytes);
+        XFree( pBytes );
+    }
+
+    nVersion = std::min<int>(nVersion, nXdndProtocolRevision);
+
+    return nVersion;
+}
+
+void SelectionManager::updateDragWindow( int nX, int nY, ::Window aRoot )
+{
+    osl::ResettableMutexGuard aGuard( m_aMutex );
+
+    css::uno::Reference< XDragSourceListener > xListener( m_xDragSourceListener );
+
+    m_nLastDragX = nX;
+    m_nLastDragY = nY;
+
+    ::Window aParent = aRoot;
+    ::Window aChild;
+    ::Window aNewProxy = None, aNewCurrentWindow = None;
+    int nNewProtocolVersion = -1;
+    int nWinX, nWinY;
+
+    // find the first XdndAware window or check if root window is
+    // XdndAware or has XdndProxy
+    do
+    {
+        XTranslateCoordinates( m_pDisplay, aRoot, aParent, nX, nY, &nWinX, &nWinY, &aChild );
+        if( aChild != None )
+        {
+            if( aChild == m_aCurrentDropWindow && aChild != aRoot && m_nCurrentProtocolVersion >= 0 )
+            {
+                aParent = aChild;
+                break;
+            }
+            nNewProtocolVersion = getXdndVersion( aChild, aNewProxy );
+            aParent = aChild;
+        }
+    } while( aChild != None && nNewProtocolVersion < 0 );
+
+    aNewCurrentWindow = aParent;
+    if( aNewCurrentWindow == aRoot )
+    {
+        // no children, try root drop
+        nNewProtocolVersion = getXdndVersion( aNewCurrentWindow, aNewProxy );
+        if( nNewProtocolVersion < 3 )
+        {
+            aNewCurrentWindow = aNewProxy = None;
+            nNewProtocolVersion = nXdndProtocolRevision;
+        }
+    }
+
+    DragSourceDragEvent dsde;
+    dsde.Source             = static_cast< OWeakObject* >(this);
+    dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+    dsde.DragSource         = static_cast< XDragSource* >(this);
+    dsde.DropAction         = nNewProtocolVersion >= 0 ? m_nUserDragAction : DNDConstants::ACTION_COPY;
+    dsde.UserAction         = nNewProtocolVersion >= 0 ? m_nUserDragAction : DNDConstants::ACTION_COPY;
+
+    std::unordered_map< ::Window, DropTargetEntry >::const_iterator it;
+    if( aNewCurrentWindow != m_aDropWindow )
+    {
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "drag left window "
+                << std::showbase << std::hex
+                << m_aDropWindow
+                << std::dec
+                << " (rev. "
+                << m_nCurrentProtocolVersion
+                << "), entered window "
+                << std::showbase << std::hex
+                << aNewCurrentWindow
+                << " (rev "
+                << std::dec
+                << nNewProtocolVersion
+                << ").");
+#endif
+        if( m_aDropWindow != None )
+        {
+            it = m_aDropTargets.find( m_aDropWindow );
+            if( it != m_aDropTargets.end() )
+                // shortcut for own drop targets
+            {
+                DropTargetEvent dte;
+                dte.Source  = static_cast< OWeakObject* >( it->second.m_pTarget );
+                aGuard.clear();
+                it->second.m_pTarget->dragExit( dte );
+                aGuard.reset();
+            }
+            else
+            {
+                // send old drop target a XdndLeave
+                XEvent aEvent;
+                aEvent.type = ClientMessage;
+                aEvent.xclient.display          = m_pDisplay;
+                aEvent.xclient.format           = 32;
+                aEvent.xclient.message_type     = m_nXdndLeave;
+                aEvent.xclient.window           = m_aDropWindow;
+                aEvent.xclient.data.l[0]        = m_aWindow;
+                aEvent.xclient.data.l[1]        = 0;
+                XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+            }
+            if( xListener.is() )
+            {
+                aGuard.clear();
+                xListener->dragExit( dsde );
+                aGuard.reset();
+            }
+        }
+
+        m_nCurrentProtocolVersion   = nNewProtocolVersion;
+        m_aDropWindow               = aNewCurrentWindow;
+        m_aDropProxy                = aNewProxy != None ? aNewProxy : m_aDropWindow;
+
+        it = m_aDropTargets.find( m_aDropWindow );
+        if( it != m_aDropTargets.end() && ! it->second.m_pTarget->m_bActive )
+            m_aDropProxy = None;
+
+        if( m_aDropProxy != None && xListener.is() )
+        {
+            aGuard.clear();
+            xListener->dragEnter( dsde );
+            aGuard.reset();
+        }
+        // send XdndEnter
+        if( m_aDropProxy != None && m_nCurrentProtocolVersion >= 0 )
+        {
+            it = m_aDropTargets.find( m_aDropWindow );
+            if( it != m_aDropTargets.end() )
+            {
+                XTranslateCoordinates( m_pDisplay, aRoot, m_aDropWindow, nX, nY, &nWinX, &nWinY, &aChild );
+                DropTargetDragEnterEvent dtde;
+                dtde.Source                 = static_cast< OWeakObject* >( it->second.m_pTarget );
+                dtde.Context                = new DropTargetDragContext( m_aCurrentDropWindow, *this );
+                dtde.LocationX              = nWinX;
+                dtde.LocationY              = nWinY;
+                dtde.DropAction             = m_nUserDragAction;
+                dtde.SourceActions          = m_nSourceActions;
+                dtde.SupportedDataFlavors   = m_xDragSourceTransferable->getTransferDataFlavors();
+                aGuard.clear();
+                it->second.m_pTarget->dragEnter( dtde );
+                aGuard.reset();
+            }
+            else
+            {
+                XEvent aEvent;
+                aEvent.type = ClientMessage;
+                aEvent.xclient.display          = m_pDisplay;
+                aEvent.xclient.format           = 32;
+                aEvent.xclient.message_type = m_nXdndEnter;
+                aEvent.xclient.window       = m_aDropWindow;
+                aEvent.xclient.data.l[0]    = m_aWindow;
+                aEvent.xclient.data.l[1]    = m_nCurrentProtocolVersion << 24;
+                memset( aEvent.xclient.data.l + 2, 0, sizeof( long )*3 );
+                // fill in data types
+                ::std::list< Atom > aConversions;
+                getNativeTypeList( m_aDragFlavors, aConversions, m_nXdndSelection );
+                if( aConversions.size() > 3 )
+                    aEvent.xclient.data.l[1] |= 1;
+                ::std::list< Atom >::const_iterator type_it = aConversions.begin();
+                for( int i = 0; type_it != aConversions.end() && i < 3; i++, ++type_it )
+                    aEvent.xclient.data.l[i+2] = *type_it;
+                XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+            }
+        }
+        m_nNoPosX = m_nNoPosY = m_nNoPosWidth = m_nNoPosHeight = 0;
+    }
+    else if( m_aDropProxy != None && xListener.is() )
+    {
+        aGuard.clear();
+        // drag over for XdndAware windows comes when receiving XdndStatus
+        xListener->dragOver( dsde );
+    }
+}
+
+void SelectionManager::startDrag(
+                                 const DragGestureEvent& trigger,
+                                 sal_Int8 sourceActions,
+                                 sal_Int32,
+                                 sal_Int32,
+                                 const css::uno::Reference< XTransferable >& transferable,
+                                 const css::uno::Reference< XDragSourceListener >& listener
+                                 )
+{
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "startDrag( sourceActions = "
+            << std::hex
+            << (int)sourceActions
+            << " ).");
+#endif
+    DragSourceDropEvent aDragFailedEvent;
+    aDragFailedEvent.Source             = static_cast< OWeakObject* >(this);
+    aDragFailedEvent.DragSource         = static_cast< XDragSource* >(this);
+    aDragFailedEvent.DragSourceContext  = new DragSourceContext( None, *this );
+    aDragFailedEvent.DropAction         = DNDConstants::ACTION_NONE;
+    aDragFailedEvent.DropSuccess        = false;
+
+    if( m_aDragRunning.check() )
+    {
+        if( listener.is() )
+            listener->dragDropEnd( aDragFailedEvent );
+
+#if OSL_DEBUG_LEVEL > 1
+        SAL_WARN("vcl.unx.dtrans",
+                "*** ERROR *** second drag and drop started.");
+        if( m_xDragSourceListener.is() )
+            SAL_WARN("vcl.unx.dtrans",
+                    "*** ERROR *** drag source listener already set.");
+        else
+            SAL_WARN("vcl.unx.dtrans",
+                    "*** ERROR *** drag thread already running.");
+#endif
+        return;
+    }
+
+    SalFrame* pCaptureFrame = nullptr;
+
+    {
+        osl::ClearableMutexGuard aGuard(m_aMutex);
+
+        // first get the current pointer position and the window that
+        // the pointer is located in. since said window should be one
+        // of our DropTargets at the time of executeDrag we can use
+        // them for a start
+        ::Window aRoot, aParent, aChild;
+        int root_x(0), root_y(0), win_x(0), win_y(0);
+        unsigned int mask(0);
+
+        bool bPointerFound = false;
+        for (auto const& dropTarget : m_aDropTargets)
+        {
+            if( XQueryPointer( m_pDisplay, dropTarget.second.m_aRootWindow,
+                               &aRoot, &aParent,
+                               &root_x, &root_y,
+                               &win_x, &win_y,
+                               &mask ) )
+            {
+                aParent = dropTarget.second.m_aRootWindow;
+                aRoot = aParent;
+                bPointerFound = true;
+                break;
+            }
+        }
+
+        // don't start DnD if there is none of our windows on the same screen as
+        // the pointer or if no mouse button is pressed
+        if( !bPointerFound || (mask & (Button1Mask|Button2Mask|Button3Mask)) == 0 )
+        {
+            aGuard.clear();
+            if( listener.is() )
+                listener->dragDropEnd( aDragFailedEvent );
+            return;
+        }
+
+        // try to find which of our drop targets is the drag source
+        // if that drop target is deregistered we should stop executing
+        // the drag (actually this is a poor substitute for an "endDrag"
+        // method ).
+        m_aDragSourceWindow = None;
+        do
+        {
+            XTranslateCoordinates( m_pDisplay, aRoot, aParent, root_x, root_y, &win_x, &win_y, &aChild );
+            if( aChild != None && m_aDropTargets.find( aChild ) != m_aDropTargets.end() )
+            {
+                m_aDragSourceWindow = aChild;
+#if OSL_DEBUG_LEVEL > 1
+                SAL_INFO("vcl.unx.dtrans", "found drag source window "
+                        << std::showbase << std::hex
+                        << m_aDragSourceWindow);
+#endif
+                break;
+            }
+            aParent = aChild;
+        } while( aChild != None );
+
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "try to grab pointer ...");
+#endif
+        int nPointerGrabSuccess =
+            XGrabPointer( m_pDisplay, aRoot, True,
+                          DRAG_EVENT_MASK,
+                          GrabModeAsync, GrabModeAsync,
+                          None,
+                          None,
+                          CurrentTime );
+        /* if we could not grab the pointer here, there is a chance
+           that the pointer is grabbed by the other vcl display (the main loop)
+           so let's break that grab and reset it later
+
+           remark: this whole code should really be molten into normal vcl so only
+           one display is used...
+        */
+        if( nPointerGrabSuccess != GrabSuccess )
+        {
+            comphelper::SolarMutex& rSolarMutex( Application::GetSolarMutex() );
+            if( rSolarMutex.tryToAcquire() )
+            {
+                pCaptureFrame = vcl_sal::getSalDisplay(GetGenericUnixSalData())->GetCaptureFrame();
+                if( pCaptureFrame )
+                {
+                    vcl_sal::getSalDisplay(GetGenericUnixSalData())->CaptureMouse( nullptr );
+                    nPointerGrabSuccess =
+                                XGrabPointer( m_pDisplay, aRoot, True,
+                                              DRAG_EVENT_MASK,
+                                              GrabModeAsync, GrabModeAsync,
+                                              None,
+                                              None,
+                                              CurrentTime );
+                }
+            }
+        }
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "... grabbed pointer: "
+                << nPointerGrabSuccess);
+        SAL_INFO("vcl.unx.dtrans", "try to grab keyboard ...");
+#endif
+        int nKeyboardGrabSuccess =
+            XGrabKeyboard( m_pDisplay, aRoot, True,
+                           GrabModeAsync, GrabModeAsync, CurrentTime );
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "... grabbed keyboard: "
+                << nKeyboardGrabSuccess);
+#endif
+        if( nPointerGrabSuccess != GrabSuccess || nKeyboardGrabSuccess != GrabSuccess )
+        {
+            if( nPointerGrabSuccess == GrabSuccess )
+                XUngrabPointer( m_pDisplay, CurrentTime );
+            if( nKeyboardGrabSuccess == GrabSuccess )
+                XUngrabKeyboard( m_pDisplay, CurrentTime );
+            XFlush( m_pDisplay );
+            aGuard.clear();
+            if( listener.is() )
+                listener->dragDropEnd( aDragFailedEvent );
+            if( pCaptureFrame )
+            {
+                comphelper::SolarMutex& rSolarMutex( Application::GetSolarMutex() );
+                if( rSolarMutex.tryToAcquire() )
+                    vcl_sal::getSalDisplay(GetGenericUnixSalData())->CaptureMouse( pCaptureFrame );
+#if OSL_DEBUG_LEVEL > 0
+                else
+                    OSL_FAIL( "failed to acquire SolarMutex to reset capture frame" );
+#endif
+            }
+            return;
+        }
+
+        m_xDragSourceTransferable   = transferable;
+        m_xDragSourceListener       = listener;
+        m_aDragFlavors              = transferable->getTransferDataFlavors();
+        m_aCurrentCursor            = None;
+
+        requestOwnership( m_nXdndSelection );
+
+        ::std::list< Atom > aConversions;
+        getNativeTypeList( m_aDragFlavors, aConversions, m_nXdndSelection );
+
+        Atom* pTypes = static_cast<Atom*>(alloca( sizeof(Atom)*aConversions.size() ));
+        int nTypes = 0;
+        for (auto const& conversion : aConversions)
+            pTypes[nTypes++] = conversion;
+
+        XChangeProperty( m_pDisplay, m_aWindow, m_nXdndTypeList, XA_ATOM, 32, PropModeReplace, reinterpret_cast<unsigned char*>(pTypes), nTypes );
+
+        m_nSourceActions                = sourceActions | DNDConstants::ACTION_DEFAULT;
+        m_nUserDragAction               = DNDConstants::ACTION_MOVE & m_nSourceActions;
+        if( ! m_nUserDragAction )
+            m_nUserDragAction           = DNDConstants::ACTION_COPY & m_nSourceActions;
+        if( ! m_nUserDragAction )
+            m_nUserDragAction           = DNDConstants::ACTION_LINK & m_nSourceActions;
+        m_nTargetAcceptAction           = DNDConstants::ACTION_DEFAULT;
+        m_bDropSent                     = false;
+        m_bDropSuccess                  = false;
+        m_bWaitingForPrimaryConversion  = false;
+        m_nDragButton                   = Button1; // default to left button
+        css::awt::MouseEvent aEvent;
+        if( trigger.Event >>= aEvent )
+        {
+            if( aEvent.Buttons & MouseButton::LEFT )
+                m_nDragButton = Button1;
+            else if( aEvent.Buttons & MouseButton::RIGHT )
+                m_nDragButton = Button3;
+            else if( aEvent.Buttons & MouseButton::MIDDLE )
+                m_nDragButton = Button2;
+        }
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "m_nUserDragAction = "
+                << std::hex
+                << (int)m_nUserDragAction);
+#endif
+        updateDragWindow( root_x, root_y, aRoot );
+        m_nUserDragAction = ~0;
+        updateDragAction( mask );
+    }
+
+    m_aDragRunning.set();
+    m_aDragExecuteThread = osl_createSuspendedThread( call_SelectionManager_runDragExecute, this );
+    if( m_aDragExecuteThread )
+        osl_resumeThread( m_aDragExecuteThread );
+    else
+    {
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "osl_createSuspendedThread failed "
+                << "for drag execute.");
+#endif
+        m_xDragSourceListener.clear();
+        m_xDragSourceTransferable.clear();
+
+        m_bDropSent                         = false;
+        m_bDropSuccess                      = false;
+        m_bWaitingForPrimaryConversion      = false;
+        m_aDropWindow                       = None;
+        m_aDropProxy                        = None;
+        m_nCurrentProtocolVersion           = nXdndProtocolRevision;
+        m_nNoPosX                           = 0;
+        m_nNoPosY                           = 0;
+        m_nNoPosWidth                       = 0;
+        m_nNoPosHeight                      = 0;
+        m_aCurrentCursor                    = None;
+
+        XUngrabPointer( m_pDisplay, CurrentTime );
+        XUngrabKeyboard( m_pDisplay, CurrentTime );
+        XFlush( m_pDisplay );
+
+        if( pCaptureFrame )
+        {
+            comphelper::SolarMutex& rSolarMutex( Application::GetSolarMutex() );
+            if( rSolarMutex.tryToAcquire() )
+                vcl_sal::getSalDisplay(GetGenericUnixSalData())->CaptureMouse( pCaptureFrame );
+#if OSL_DEBUG_LEVEL > 0
+            else
+                OSL_FAIL( "failed to acquire SolarMutex to reset capture frame" );
+#endif
+        }
+
+        m_aDragRunning.reset();
+
+        if( listener.is() )
+            listener->dragDropEnd( aDragFailedEvent );
+    }
+}
+
+void SelectionManager::runDragExecute( void* pThis )
+{
+    SelectionManager* This = static_cast<SelectionManager*>(pThis);
+    This->dragDoDispatch();
+}
+
+void SelectionManager::dragDoDispatch()
+{
+
+    // do drag
+    // m_xDragSourceListener will be cleared on finished drop
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "begin executeDrag dispatching.");
+#endif
+    oslThread aThread = m_aDragExecuteThread;
+    while( m_xDragSourceListener.is() && ( ! m_bDropSent || time(nullptr)-m_nDropTimeout < 5 ) && osl_scheduleThread( aThread ) )
+    {
+        // let the thread in the run method do the dispatching
+        // just look occasionally here whether drop timed out or is completed
+        osl::Thread::wait(std::chrono::milliseconds(200));
+    }
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "end executeDrag dispatching.");
+#endif
+    {
+        osl::ClearableMutexGuard aGuard(m_aMutex);
+
+        css::uno::Reference< XDragSourceListener > xListener( m_xDragSourceListener );
+        css::uno::Reference< XTransferable > xTransferable( m_xDragSourceTransferable );
+        m_xDragSourceListener.clear();
+        m_xDragSourceTransferable.clear();
+
+        DragSourceDropEvent dsde;
+        dsde.Source             = static_cast< OWeakObject* >(this);
+        dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+        dsde.DragSource         = static_cast< XDragSource* >(this);
+        dsde.DropAction         = DNDConstants::ACTION_NONE;
+        dsde.DropSuccess        = false;
+
+        // cleanup after drag
+        if( m_bWaitingForPrimaryConversion )
+        {
+            SelectionAdaptor* pAdaptor = getAdaptor( XA_PRIMARY );
+            if (pAdaptor)
+                pAdaptor->clearTransferable();
+        }
+
+        m_bDropSent                         = false;
+        m_bDropSuccess                      = false;
+        m_bWaitingForPrimaryConversion      = false;
+        m_aDropWindow                       = None;
+        m_aDropProxy                        = None;
+        m_nCurrentProtocolVersion           = nXdndProtocolRevision;
+        m_nNoPosX                           = 0;
+        m_nNoPosY                           = 0;
+        m_nNoPosWidth                       = 0;
+        m_nNoPosHeight                      = 0;
+        m_aCurrentCursor                    = None;
+
+        XUngrabPointer( m_pDisplay, CurrentTime );
+        XUngrabKeyboard( m_pDisplay, CurrentTime );
+        XFlush( m_pDisplay );
+
+        m_aDragExecuteThread = nullptr;
+        m_aDragRunning.reset();
+
+        aGuard.clear();
+        if( xListener.is() )
+        {
+            xTransferable.clear();
+            xListener->dragDropEnd( dsde );
+        }
+    }
+    osl_destroyThread( aThread );
+}
+
+/*
+ *  XDragSourceContext
+ */
+
+
+void SelectionManager::setCursor( sal_Int32 cursor, ::Window aDropWindow )
+{
+    osl::MutexGuard aGuard( m_aMutex );
+    if( aDropWindow == m_aDropWindow && Cursor(cursor) != m_aCurrentCursor )
+    {
+        if( m_xDragSourceListener.is() && ! m_bDropSent )
+        {
+            m_aCurrentCursor = cursor;
+            XChangeActivePointerGrab( m_pDisplay, DRAG_EVENT_MASK, cursor, CurrentTime );
+            XFlush( m_pDisplay );
+        }
+    }
+}
+
+void SelectionManager::transferablesFlavorsChanged()
+{
+    osl::MutexGuard aGuard(m_aMutex);
+
+    m_aDragFlavors = m_xDragSourceTransferable->getTransferDataFlavors();
+
+    std::list< Atom > aConversions;
+
+    getNativeTypeList( m_aDragFlavors, aConversions, m_nXdndSelection );
+
+    Atom* pTypes = static_cast<Atom*>(alloca( sizeof(Atom)*aConversions.size() ));
+    int nTypes = 0;
+    for (auto const& conversion : aConversions)
+        pTypes[nTypes++] = conversion;
+    XChangeProperty( m_pDisplay, m_aWindow, m_nXdndTypeList, XA_ATOM, 32, PropModeReplace, reinterpret_cast<unsigned char*>(pTypes), nTypes );
+
+    if( m_aCurrentDropWindow == None || m_nCurrentProtocolVersion < 0 )
+        return;
+
+    // send synthetic leave and enter events
+
+    XEvent aEvent;
+
+    aEvent.type = ClientMessage;
+    aEvent.xclient.display          = m_pDisplay;
+    aEvent.xclient.format           = 32;
+    aEvent.xclient.window           = m_aDropWindow;
+    aEvent.xclient.data.l[0]        = m_aWindow;
+
+    aEvent.xclient.message_type     = m_nXdndLeave;
+    aEvent.xclient.data.l[1]        = 0;
+    XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+
+    aEvent.xclient.message_type = m_nXdndEnter;
+    aEvent.xclient.data.l[1]    = m_nCurrentProtocolVersion << 24;
+    memset( aEvent.xclient.data.l + 2, 0, sizeof( long )*3 );
+    // fill in data types
+    if( nTypes > 3 )
+        aEvent.xclient.data.l[1] |= 1;
+    for( int j = 0; j < nTypes && j < 3; j++ )
+        aEvent.xclient.data.l[j+2] = pTypes[j];
+
+    XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+
+}
+
+/*
+ *  dispatch loop
+ */
+
+bool SelectionManager::handleXEvent( XEvent& rEvent )
+{
+    /*
+     *  since we are XConnectionListener to a second X display
+     *  to get client messages it is essential not to dispatch
+     *  events twice that we get on both connections
+     *
+     *  between dispatching ButtonPress and startDrag
+     *  the user can already have released the mouse. The ButtonRelease
+     *  will then be dispatched in VCLs queue and never turn up here.
+     *  Which is not so good, since startDrag will XGrabPointer and
+     *  XGrabKeyboard -> solid lock.
+     */
+    if( rEvent.xany.display != m_pDisplay
+        && rEvent.type != ClientMessage
+        && rEvent.type != ButtonPress
+        && rEvent.type != ButtonRelease
+        )
+        return false;
+
+    bool bHandled = false;
+    switch (rEvent.type)
+    {
+        case SelectionClear:
+        {
+            osl::ClearableMutexGuard aGuard(m_aMutex);
+#if OSL_DEBUG_LEVEL > 1
+            SAL_INFO("vcl.unx.dtrans", "SelectionClear for selection "
+                    << getString( rEvent.xselectionclear.selection ));
+#endif
+            SelectionAdaptor* pAdaptor = getAdaptor( rEvent.xselectionclear.selection );
+            std::unordered_map< Atom, Selection* >::iterator it( m_aSelections.find( rEvent.xselectionclear.selection ) );
+            if( it != m_aSelections.end() )
+                it->second->m_bOwner = false;
+            aGuard.clear();
+            if ( pAdaptor )
+                pAdaptor->clearTransferable();
+        }
+        break;
+
+        case SelectionRequest:
+            bHandled = handleSelectionRequest( rEvent.xselectionrequest );
+            break;
+        case PropertyNotify:
+            if( rEvent.xproperty.window == m_aWindow ||
+                rEvent.xproperty.window == m_aCurrentDropWindow
+                )
+                bHandled = handleReceivePropertyNotify( rEvent.xproperty );
+            else
+                bHandled = handleSendPropertyNotify( rEvent.xproperty );
+            break;
+        case SelectionNotify:
+            bHandled = handleSelectionNotify( rEvent.xselection );
+            break;
+        case ClientMessage:
+            // messages from drag target
+            if( rEvent.xclient.message_type == m_nXdndStatus ||
+                rEvent.xclient.message_type == m_nXdndFinished )
+                bHandled = handleDragEvent( rEvent );
+            // messages from drag source
+            else if(
+                    rEvent.xclient.message_type == m_nXdndEnter     ||
+                    rEvent.xclient.message_type == m_nXdndLeave     ||
+                    rEvent.xclient.message_type == m_nXdndPosition  ||
+                    rEvent.xclient.message_type == m_nXdndDrop
+                    )
+                bHandled = handleDropEvent( rEvent.xclient );
+            break;
+        case EnterNotify:
+        case LeaveNotify:
+        case MotionNotify:
+        case ButtonPress:
+        case ButtonRelease:
+        case KeyPress:
+        case KeyRelease:
+            bHandled = handleDragEvent( rEvent );
+            break;
+        default:
+            ;
+    }
+    return bHandled;
+}
+
+void SelectionManager::dispatchEvent( int millisec )
+{
+    // acquire the mutex to prevent other threads
+    // from using the same X connection
+    osl::ResettableMutexGuard aGuard(m_aMutex);
+
+    if( !XPending( m_pDisplay ))
+    {
+        int nfds = 1;
+        // wait for any events if none are already queued
+        pollfd aPollFD[2];
+        aPollFD[0].fd      = XConnectionNumber( m_pDisplay );
+        aPollFD[0].events  = POLLIN;
+        aPollFD[0].revents = 0;
+
+        // on infinite timeout we need endthreadpipe monitoring too
+        if (millisec < 0)
+        {
+            aPollFD[1].fd      = m_EndThreadPipe[0];
+            aPollFD[1].events  = POLLIN | POLLERR;
+            aPollFD[1].revents = 0;
+            nfds = 2;
+        }
+
+        // release mutex for the time of waiting for possible data
+        aGuard.clear();
+        if( poll( aPollFD, nfds, millisec ) <= 0 )
+            return;
+        aGuard.reset();
+    }
+    while( XPending( m_pDisplay ))
+    {
+        XEvent event;
+        XNextEvent( m_pDisplay, &event );
+        aGuard.clear();
+        handleXEvent( event );
+        aGuard.reset();
+    }
+}
+
+void SelectionManager::run( void* pThis )
+{
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "SelectionManager::run.");
+#endif
+    osl::Thread::setName("SelectionManager");
+    // dispatch until the cows come home
+
+    SelectionManager* This = static_cast<SelectionManager*>(pThis);
+
+    timeval aLast;
+    gettimeofday( &aLast, nullptr );
+
+    css::uno::Reference< XComponentContext > xContext( ::comphelper::getProcessComponentContext() );
+    This->m_xDesktop.set( Desktop::create(xContext) );
+    This->m_xDesktop->addTerminateListener(This);
+
+    // if end thread pipe properly initialized, allow infinite wait in poll
+    // otherwise, fallback on 1 sec timeout
+    const int timeout = (This->m_EndThreadPipe[0] != This->m_EndThreadPipe[1]) ? -1 : 1000;
+
+    while( osl_scheduleThread(This->m_aThread) )
+    {
+        This->dispatchEvent( timeout );
+
+        timeval aNow;
+        gettimeofday( &aNow, nullptr );
+
+        if( (aNow.tv_sec - aLast.tv_sec) > 0 )
+        {
+            osl::ClearableMutexGuard aGuard(This->m_aMutex);
+            std::vector< std::pair< SelectionAdaptor*, css::uno::Reference< XInterface > > > aChangeVector;
+
+            for (auto const& selection : This->m_aSelections)
+            {
+                if( selection.first != This->m_nXdndSelection && ! selection.second->m_bOwner )
+                {
+                    ::Window aOwner = XGetSelectionOwner( This->m_pDisplay, selection.first );
+                    if( aOwner != selection.second->m_aLastOwner )
+                    {
+                        selection.second->m_aLastOwner = aOwner;
+                        std::pair< SelectionAdaptor*, css::uno::Reference< XInterface > >
+                            aKeep( selection.second->m_pAdaptor, selection.second->m_pAdaptor->getReference() );
+                        aChangeVector.push_back( aKeep );
+                    }
+                }
+            }
+            aGuard.clear();
+            for (auto const& change : aChangeVector)
+            {
+                change.first->fireContentsChanged();
+            }
+            aLast = aNow;
+        }
+    }
+    // close write end on exit so write() fails and other thread does not block
+    // forever
+    close(This->m_EndThreadPipe[1]);
+    close(This->m_EndThreadPipe[0]);
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "SelectionManager::run end.");
+#endif
+}
+
+void SelectionManager::shutdown() throw()
+{
+#if OSL_DEBUG_LEVEL > 1
+    SAL_INFO("vcl.unx.dtrans", "SelectionManager got app termination event.");
+#endif
+
+    osl::ResettableMutexGuard aGuard(m_aMutex);
+
+    if( m_bShutDown )
+        return;
+    m_bShutDown = true;
+
+    if ( m_xDesktop.is() )
+        m_xDesktop->removeTerminateListener(this);
+
+    if( m_xDisplayConnection.is() )
+        m_xDisplayConnection->removeEventHandler(Any(), this);
+
+    // stop dispatching
+    if( m_aThread )
+    {
+        osl_terminateThread( m_aThread );
+        /*
+         * Allow thread to finish before app exits to avoid pulling the carpet
+         * out from under it if pasting is occurring during shutdown
+         *
+         * a) allow it to have the Mutex and
+         * b) reschedule to allow it to complete callbacks to any
+         * Application::GetSolarMutex protected regions, etc. e.g.
+         * TransferableHelper::getTransferDataFlavors (via
+         * SelectionManager::handleSelectionRequest) which it might
+         * currently be trying to enter.
+         *
+         * Otherwise the thread may be left still waiting on a GlobalMutex
+         * when that gets destroyed, letting the thread blow up and die
+         * when enters the section in a now dead OOo instance.
+         */
+        aGuard.clear();
+        while (osl_isThreadRunning(m_aThread))
+        {
+            {   // drop mutex before write - otherwise may deadlock
+                SolarMutexGuard guard2;
+                Application::Reschedule();
+            }
+            // trigger poll()'s wait end by writing a dummy value
+            char dummy=0;
+            dummy = write(m_EndThreadPipe[1], &dummy, 1);
+        }
+        osl_joinWithThread( m_aThread );
+        osl_destroyThread( m_aThread );
+        m_aThread = nullptr;
+        aGuard.reset();
+    }
+    m_xDesktop.clear();
+    m_xDisplayConnection.clear();
+    m_xDropTransferable.clear();
+}
+
+sal_Bool SelectionManager::handleEvent(const Any& event)
+{
+    Sequence< sal_Int8 > aSeq;
+    if( event >>= aSeq )
+    {
+        XEvent* pEvent = reinterpret_cast<XEvent*>(aSeq.getArray());
+        Time nTimestamp = CurrentTime;
+        if( pEvent->type == ButtonPress || pEvent->type == ButtonRelease )
+            nTimestamp = pEvent->xbutton.time;
+        else if( pEvent->type == KeyPress || pEvent->type == KeyRelease )
+            nTimestamp = pEvent->xkey.time;
+        else if( pEvent->type == MotionNotify )
+            nTimestamp = pEvent->xmotion.time;
+        else if( pEvent->type == PropertyNotify )
+            nTimestamp = pEvent->xproperty.time;
+
+        if( nTimestamp != CurrentTime )
+        {
+            osl::MutexGuard aGuard(m_aMutex);
+
+            m_nSelectionTimestamp = nTimestamp;
+        }
+
+        return handleXEvent( *pEvent );
+    }
+    else
+    {
+#if OSL_DEBUG_LEVEL > 1
+        SAL_INFO("vcl.unx.dtrans", "SelectionManager got downing event.");
+#endif
+        shutdown();
+    }
+    return true;
+}
+
+void SAL_CALL SelectionManager::disposing( const css::lang::EventObject& rEvt )
+{
+    if (rEvt.Source == m_xDesktop || rEvt.Source == m_xDisplayConnection)
+        shutdown();
+}
+
+void SAL_CALL SelectionManager::queryTermination( const css::lang::EventObject& )
+{
+}
+
+/*
+ * To be safe, shutdown needs to be called before the ~SfxApplication is called, waiting until
+ * the downing event can be too late if paste are requested during shutdown and ~SfxApplication
+ * has been called before vcl is shutdown
+ */
+void SAL_CALL SelectionManager::notifyTermination( const css::lang::EventObject& rEvent )
+{
+    disposing(rEvent);
+}
+
+void SelectionManager::registerHandler( Atom selection, SelectionAdaptor& rAdaptor )
+{
+    osl::MutexGuard aGuard(m_aMutex);
+
+    Selection* pNewSelection    = new Selection();
+    pNewSelection->m_pAdaptor   = &rAdaptor;
+    m_aSelections[ selection ]  = pNewSelection;
+}
+
+void SelectionManager::deregisterHandler( Atom selection )
+{
+    osl::MutexGuard aGuard(m_aMutex);
+
+    std::unordered_map< Atom, Selection* >::iterator it =
+          m_aSelections.find( selection );
+    if( it != m_aSelections.end() )
+    {
+        delete it->second->m_pPixmap;
+        delete it->second;
+        m_aSelections.erase( it );
+    }
+}
+
+static bool bWasError = false;
+
+extern "C"
+{
+    static int local_xerror_handler(Display* , XErrorEvent*)
+    {
+        bWasError = true;
+        return 0;
+    }
+    typedef int(*xerror_hdl_t)(Display*,XErrorEvent*);
+}
+
+void SelectionManager::registerDropTarget( ::Window aWindow, DropTarget* pTarget )
+{
+    osl::MutexGuard aGuard(m_aMutex);
+
+    // sanity check
+    std::unordered_map< ::Window, DropTargetEntry >::const_iterator it =
+          m_aDropTargets.find( aWindow );
+    if( it != m_aDropTargets.end() )
+        OSL_FAIL( "attempt to register window as drop target twice" );
+    else if( aWindow && m_pDisplay )
+    {
+        DropTargetEntry aEntry( pTarget );
+        bWasError=false;
+        /* #i100000# ugly workaround: gtk sets its own XErrorHandler which is not suitable for us
+           unfortunately XErrorHandler is not per display, so this is just and ugly hack
+           Need to remove separate display and integrate clipboard/dnd into vcl's unx code ASAP
+        */
+        xerror_hdl_t pOldHandler = XSetErrorHandler( local_xerror_handler );
+        XSelectInput( m_pDisplay, aWindow, PropertyChangeMask );
+        if( ! bWasError )
+        {
+            // set XdndAware
+            XChangeProperty( m_pDisplay, aWindow, m_nXdndAware, XA_ATOM, 32, PropModeReplace, reinterpret_cast<unsigned char const *>(&nXdndProtocolRevision), 1 );
+            if( ! bWasError )
+            {
+                // get root window of window (in 99.999% of all cases this will be
+                // DefaultRootWindow( m_pDisplay )
+                int x, y;
+                unsigned int w, h, bw, d;
+                XGetGeometry( m_pDisplay, aWindow, &aEntry.m_aRootWindow,
+                              &x, &y, &w, &h, &bw, &d );
+            }
+        }
+        XSetErrorHandler( pOldHandler );
+        if(bWasError)
+            return;
+        m_aDropTargets[ aWindow ] = aEntry;
+    }
+    else
+        OSL_FAIL( "attempt to register None as drop target" );
+}
+
+void SelectionManager::deregisterDropTarget( ::Window aWindow )
+{
+    osl::ClearableMutexGuard aGuard(m_aMutex);
+
+    m_aDropTargets.erase( aWindow );
+    if( aWindow != m_aDragSourceWindow || !m_aDragRunning.check() )
+        return;
+
+    // abort drag
+    std::unordered_map< ::Window, DropTargetEntry >::const_iterator it =
+        m_aDropTargets.find( m_aDropWindow );
+    if( it != m_aDropTargets.end() )
+    {
+        DropTargetEvent dte;
+        dte.Source = static_cast< OWeakObject* >( it->second.m_pTarget );
+        aGuard.clear();
+        it->second.m_pTarget->dragExit( dte );
+    }
+    else if( m_aDropProxy != None && m_nCurrentProtocolVersion >= 0 )
+    {
+        // send XdndLeave
+        XEvent aEvent;
+        aEvent.type = ClientMessage;
+        aEvent.xclient.display      = m_pDisplay;
+        aEvent.xclient.format       = 32;
+        aEvent.xclient.message_type = m_nXdndLeave;
+        aEvent.xclient.window       = m_aDropWindow;
+        aEvent.xclient.data.l[0]    = m_aWindow;
+        memset( aEvent.xclient.data.l+1, 0, sizeof(long)*4);
+        m_aDropWindow = m_aDropProxy = None;
+        XSendEvent( m_pDisplay, m_aDropProxy, False, NoEventMask, &aEvent );
+    }
+    // notify the listener
+    DragSourceDropEvent dsde;
+    dsde.Source             = static_cast< OWeakObject* >(this);
+    dsde.DragSourceContext  = new DragSourceContext( m_aDropWindow, *this );
+    dsde.DragSource         = static_cast< XDragSource* >(this);
+    dsde.DropAction         = DNDConstants::ACTION_NONE;
+    dsde.DropSuccess        = false;
+    css::uno::Reference< XDragSourceListener > xListener( m_xDragSourceListener );
+    m_xDragSourceListener.clear();
+    aGuard.clear();
+    xListener->dragDropEnd( dsde );
+
+}
+
+/*
+ *  SelectionAdaptor
+ */
+
+css::uno::Reference< XTransferable > SelectionManager::getTransferable() throw()
+{
+    return m_xDragSourceTransferable;
+}
+
+void SelectionManager::clearTransferable() throw()
+{
+    m_xDragSourceTransferable.clear();
+}
+
+void SelectionManager::fireContentsChanged() throw()
+{
+}
+
+css::uno::Reference< XInterface > SelectionManager::getReference() throw()
+{
+    return css::uno::Reference< XInterface >( static_cast<OWeakObject*>(this) );
+}
+
+/*
+ *  SelectionManagerHolder
+ */
+
+SelectionManagerHolder::SelectionManagerHolder() :
+        ::cppu::WeakComponentImplHelper<
+    XDragSource,
+    XInitialization,
+    XServiceInfo > (m_aMutex)
+{
+}
+
+SelectionManagerHolder::~SelectionManagerHolder()
+{
+}
+
+void SelectionManagerHolder::initialize( const Sequence< Any >& arguments )
+{
+    OUString aDisplayName;
+
+    if( arguments.hasElements() )
+    {
+        css::uno::Reference< XDisplayConnection > xConn;
+        arguments.getConstArray()[0] >>= xConn;
+        if( xConn.is() )
+        {
+            Any aIdentifier;
+            aIdentifier >>= aDisplayName;
+        }
+    }
+
+    SelectionManager& rManager = SelectionManager::get( aDisplayName );
+    rManager.initialize( arguments );
+    m_xRealDragSource = static_cast< XDragSource* >(&rManager);
+}
+
+/*
+ *  XDragSource
+ */
+
+sal_Bool SelectionManagerHolder::isDragImageSupported()
+{
+    return m_xRealDragSource.is() && m_xRealDragSource->isDragImageSupported();
+}
+
+sal_Int32 SelectionManagerHolder::getDefaultCursor( sal_Int8 dragAction )
+{
+    return m_xRealDragSource.is() ? m_xRealDragSource->getDefaultCursor( dragAction ) : 0;
+}
+
+void SelectionManagerHolder::startDrag(
+                                       const css::datatransfer::dnd::DragGestureEvent& trigger,
+                                       sal_Int8 sourceActions, sal_Int32 cursor, sal_Int32 image,
+                                       const css::uno::Reference< css::datatransfer::XTransferable >& transferable,
+                                       const css::uno::Reference< css::datatransfer::dnd::XDragSourceListener >& listener
+                                       )
+{
+    if( m_xRealDragSource.is() )
+        m_xRealDragSource->startDrag( trigger, sourceActions, cursor, image, transferable, listener );
+}
+
+/*
+ *  XServiceInfo
+ */
+
+OUString SelectionManagerHolder::getImplementationName()
+{
+    return XDND_IMPLEMENTATION_NAME;
+}
+
+sal_Bool SelectionManagerHolder::supportsService( const OUString& ServiceName )
+{
+    return cppu::supportsService(this, ServiceName);
+}
+
+Sequence< OUString > SelectionManagerHolder::getSupportedServiceNames()
+{
+    return Xdnd_getSupportedServiceNames();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */