Add Qt3 development HEAD version

1 files changed, 1674 insertions, 0 deletions

diff --git a/src/kernel/qclipboard_x11.cpp b/src/kernel/qclipboard_x11.cpp
new file mode 100644
index 0000000..73cdad4
--- /dev/null
+++ b/src/kernel/qclipboard_x11.cpp
@@ -0,0 +1,1674 @@
+/****************************************************************************
+**
+** Implementation of QClipboard class for X11
+**
+** Created : 960430
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of the kernel module of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.QPL
+** included in the packaging of this file.  Licensees holding valid Qt
+** Commercial licenses may use this file in accordance with the Qt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+// #define QCLIPBOARD_DEBUG
+// #define QCLIPBOARD_DEBUG_VERBOSE
+
+#ifdef QCLIPBOARD_DEBUG
+#  define QDEBUG qDebug
+#else
+#  define QDEBUG if (FALSE) qDebug
+#endif
+
+#ifdef QCLIPBOARD_DEBUG_VERBOSE
+#  define VQDEBUG qDebug
+#else
+#  define VQDEBUG if (FALSE) qDebug
+#endif
+
+#include "qplatformdefs.h"
+
+// POSIX Large File Support redefines open -> open64
+#if defined(open)
+# undef open
+#endif
+
+#include "qclipboard.h"
+
+#ifndef QT_NO_CLIPBOARD
+
+#include "qapplication.h"
+#include "qeventloop.h"
+#include "qbitmap.h"
+#include "qdatetime.h"
+#include "qdragobject.h"
+#include "qbuffer.h"
+#include "qtextcodec.h"
+#include "qvaluelist.h"
+#include "qmap.h"
+#include "qt_x11_p.h"
+#include "qapplication_p.h"
+
+
+// REVISED: arnt
+
+/*****************************************************************************
+  Internal QClipboard functions for X11.
+ *****************************************************************************/
+
+// from qapplication_x11.cpp
+typedef int (*QX11EventFilter) (XEvent*);
+extern QX11EventFilter qt_set_x11_event_filter (QX11EventFilter filter);
+
+extern Time qt_x_time;			// def. in qapplication_x11.cpp
+extern Time qt_x_incr;			// def. in qapplication_x11.cpp
+extern Atom qt_xa_clipboard;
+extern Atom qt_selection_property;
+extern Atom qt_clipboard_sentinel;
+extern Atom qt_selection_sentinel;
+extern Atom qt_utf8_string;
+
+// from qdnd_x11.cpp
+extern Atom* qt_xdnd_str_to_atom( const char *mimeType );
+extern const char* qt_xdnd_atom_to_str( Atom );
+
+
+static int clipboard_timeout = 5000; // 5s timeout on clipboard operations
+
+static QWidget * owner = 0;
+static QWidget *requestor = 0;
+static bool inSelectionMode_obsolete = FALSE; // ### remove 4.0
+static bool timer_event_clear = FALSE;
+static int timer_id = 0;
+
+static int pending_timer_id = 0;
+static bool pending_clipboard_changed = FALSE;
+static bool pending_selection_changed = FALSE;
+
+Q_EXPORT bool qt_qclipboard_bailout_hack = false;
+
+// event capture mechanism for qt_xclb_wait_for_event
+static bool waiting_for_data = FALSE;
+static bool has_captured_event = FALSE;
+static Window capture_event_win = None;
+static int capture_event_type = -1;
+static XEvent captured_event;
+
+class QClipboardWatcher; // forward decl
+static QClipboardWatcher *selection_watcher = 0;
+static QClipboardWatcher *clipboard_watcher = 0;
+
+static void cleanup()
+{
+    delete owner;
+    delete requestor;
+    owner = 0;
+    requestor = 0;
+}
+
+static
+void setupOwner()
+{
+    if ( owner )
+	return;
+    owner = new QWidget( 0, "internal clipboard owner" );
+    requestor = new QWidget(0, "internal clipboard requestor");
+    qAddPostRoutine( cleanup );
+}
+
+static
+int sizeof_format(int format)
+{
+    int sz;
+    switch (format) {
+    default:
+    case  8: sz = sizeof( char); break;
+    case 16: sz = sizeof(short); break;
+    case 32: sz = sizeof( long); break;
+    }
+    return sz;
+}
+
+class QClipboardWatcher : public QMimeSource {
+public:
+    QClipboardWatcher( QClipboard::Mode mode );
+    ~QClipboardWatcher();
+    bool empty() const;
+    const char* format( int n ) const;
+    QByteArray encodedData( const char* fmt ) const;
+    QByteArray getDataInFormat(Atom fmtatom) const;
+
+    Atom atom;
+    QValueList<const char *> formatList;
+};
+
+
+
+class QClipboardData
+{
+public:
+    QClipboardData();
+    ~QClipboardData();
+
+    void setSource(QMimeSource* s)
+    {
+	clear(TRUE);
+	src = s;
+    }
+
+    QMimeSource *source() const { return src; }
+
+    void addTransferredPixmap(QPixmap pm)
+    {
+	/* TODO: queue them */
+	transferred[tindex] = pm;
+	tindex=(tindex+1)%2;
+    }
+    void clearTransfers()
+    {
+	transferred[0] = QPixmap();
+	transferred[1] = QPixmap();
+    }
+
+    void clear(bool destruct=TRUE);
+
+    QMimeSource *src;
+    Time timestamp;
+
+    QPixmap transferred[2];
+    int tindex;
+};
+
+QClipboardData::QClipboardData()
+{
+    src = 0;
+    timestamp = CurrentTime;
+    tindex=0;
+}
+
+QClipboardData::~QClipboardData()
+{ clear(); }
+
+void QClipboardData::clear(bool destruct)
+{
+    if(destruct)
+	delete src;
+    src = 0;
+    timestamp = CurrentTime;
+}
+
+
+static QClipboardData *internalCbData = 0;
+static QClipboardData *internalSelData = 0;
+
+static void cleanupClipboardData()
+{
+    delete internalCbData;
+    internalCbData = 0;
+}
+
+static QClipboardData *clipboardData()
+{
+    if ( internalCbData == 0 ) {
+	internalCbData = new QClipboardData;
+	Q_CHECK_PTR( internalCbData );
+	qAddPostRoutine( cleanupClipboardData );
+    }
+    return internalCbData;
+}
+
+void qt_clipboard_cleanup_mime_source(QMimeSource *src)
+{
+    if(internalCbData && internalCbData->source() == src)
+	internalCbData->clear(FALSE);
+}
+
+static void cleanupSelectionData()
+{
+    delete internalSelData;
+    internalSelData = 0;
+}
+
+static QClipboardData *selectionData()
+{
+    if (internalSelData == 0) {
+	internalSelData = new QClipboardData;
+	Q_CHECK_PTR(internalSelData);
+	qAddPostRoutine(cleanupSelectionData);
+    }
+    return internalSelData;
+}
+
+class QClipboardINCRTransaction
+{
+public:
+    QClipboardINCRTransaction(Window w, Atom p, Atom t, int f, QByteArray d, unsigned int i);
+    ~QClipboardINCRTransaction(void);
+
+    int x11Event(XEvent *event);
+
+    Window window;
+    Atom property, target;
+    int format;
+    QByteArray data;
+    unsigned int increment;
+    unsigned int offset;
+};
+
+typedef QMap<Window,QClipboardINCRTransaction*> TransactionMap;
+static TransactionMap *transactions = 0;
+static QX11EventFilter prev_x11_event_filter = 0;
+static int incr_timer_id = 0;
+
+static int qt_xclb_transation_event_handler(XEvent *event)
+{
+    TransactionMap::Iterator it = transactions->find(event->xany.window);
+    if (it != transactions->end()) {
+	if ((*it)->x11Event(event) != 0)
+	    return 1;
+    }
+    if (prev_x11_event_filter)
+	return prev_x11_event_filter(event);
+    return 0;
+}
+
+/*
+  called when no INCR activity has happened for 'clipboard_timeout'
+  milliseconds... we assume that all unfinished transactions have
+  timed out and remove everything from the transaction map
+*/
+static void qt_xclb_incr_timeout(void)
+{
+    qWarning("QClipboard: timed out while sending data");
+
+    while (transactions)
+        delete *transactions->begin();
+}
+
+QClipboardINCRTransaction::QClipboardINCRTransaction(Window w, Atom p, Atom t, int f,
+						     QByteArray d, unsigned int i)
+    : window(w), property(p), target(t), format(f), data(d), increment(i), offset(0u)
+{
+    QDEBUG("QClipboard: sending %d bytes (INCR transaction %p)", d.size(), this);
+
+    XSelectInput(QPaintDevice::x11AppDisplay(), window, PropertyChangeMask);
+
+    if (! transactions) {
+	VQDEBUG("QClipboard: created INCR transaction map");
+	transactions = new TransactionMap;
+	prev_x11_event_filter = qt_set_x11_event_filter(qt_xclb_transation_event_handler);
+
+	incr_timer_id = QApplication::clipboard()->startTimer(clipboard_timeout);
+    }
+    transactions->insert(window, this);
+}
+
+QClipboardINCRTransaction::~QClipboardINCRTransaction(void)
+{
+    VQDEBUG("QClipboard: destroyed INCR transacton %p", this);
+
+    XSelectInput(QPaintDevice::x11AppDisplay(), window, NoEventMask);
+
+    transactions->remove(window);
+    if (transactions->isEmpty()) {
+	VQDEBUG("QClipboard: no more INCR transations");
+	delete transactions;
+	transactions = 0;
+	(void)qt_set_x11_event_filter(prev_x11_event_filter);
+
+	if (incr_timer_id != 0) {
+	    QApplication::clipboard()->killTimer(incr_timer_id);
+	    incr_timer_id = 0;
+	}
+    }
+}
+
+int QClipboardINCRTransaction::x11Event(XEvent *event)
+{
+    if (event->type != PropertyNotify
+	|| (event->xproperty.state != PropertyDelete
+	    || event->xproperty.atom != property))
+	return 0;
+
+    // restart the INCR timer
+    if (incr_timer_id) QApplication::clipboard()->killTimer(incr_timer_id);
+    incr_timer_id = QApplication::clipboard()->startTimer(clipboard_timeout);
+
+    unsigned int bytes_left = data.size() - offset;
+    if (bytes_left > 0) {
+	unsigned int xfer = QMIN(increment, bytes_left);
+	VQDEBUG("QClipboard: sending %d bytes, %d remaining (INCR transaction %p)",
+	       xfer, bytes_left - xfer, this);
+
+	XChangeProperty(QPaintDevice::x11AppDisplay(), window, property, target, format,
+			PropModeReplace, (uchar *) data.data() + offset, xfer);
+	offset += xfer;
+    } else {
+	// INCR transaction finished...
+	XChangeProperty(QPaintDevice::x11AppDisplay(), window, property, target, format,
+			PropModeReplace, (uchar *) data.data(), 0);
+       	delete this;
+    }
+
+    return 1;
+}
+
+
+/*****************************************************************************
+  QClipboard member functions for X11.
+ *****************************************************************************/
+
+
+void QClipboard::clear( Mode mode )
+{ setData(0, mode); }
+
+
+/*!
+    Returns TRUE if the clipboard supports mouse selection; otherwise
+    returns FALSE.
+*/
+bool QClipboard::supportsSelection() const
+{ return TRUE; }
+
+
+/*!
+    Returns TRUE if this clipboard object owns the mouse selection
+    data; otherwise returns FALSE.
+*/
+bool QClipboard::ownsSelection() const
+{ return selectionData()->timestamp != CurrentTime; }
+
+/*!
+    Returns TRUE if this clipboard object owns the clipboard data;
+    otherwise returns FALSE.
+*/
+bool QClipboard::ownsClipboard() const
+{ return clipboardData()->timestamp != CurrentTime; }
+
+
+/*! \obsolete
+
+    Use the QClipboard::data(), QClipboard::setData() and related functions
+    which take a QClipboard::Mode argument.
+
+    Sets the clipboard selection mode. If \a enable is TRUE, then
+    subsequent calls to QClipboard::setData() and other functions
+    which put data into the clipboard will put the data into the mouse
+    selection, otherwise the data will be put into the clipboard.
+
+    \sa supportsSelection(), selectionModeEnabled()
+*/
+void QClipboard::setSelectionMode(bool enable)
+{ inSelectionMode_obsolete = enable; }
+
+
+/*! \obsolete
+
+    Use the QClipboard::data(), QClipboard::setData() and related functions
+    which take a QClipboard::Mode argument.
+
+    Returns the selection mode.
+
+    \sa setSelectionMode(), supportsSelection()
+*/
+bool QClipboard::selectionModeEnabled() const
+{ return inSelectionMode_obsolete; }
+
+
+// event filter function... captures interesting events while
+// qt_xclb_wait_for_event is running the event loop
+static int qt_xclb_event_filter(XEvent *event)
+{
+    if (event->xany.type == capture_event_type &&
+	event->xany.window == capture_event_win) {
+	VQDEBUG( "QClipboard: event_filter(): caught event type %d", event->type );
+	has_captured_event = TRUE;
+	captured_event = *event;
+	return 1;
+    }
+
+    return 0;
+}
+
+static Bool checkForClipboardEvents(Display *, XEvent *e, XPointer)
+{
+    return ((e->type == SelectionRequest && (e->xselectionrequest.selection == XA_PRIMARY
+                                             || e->xselectionrequest.selection == qt_xa_clipboard))
+            || (e->type == SelectionClear && (e->xselectionclear.selection == XA_PRIMARY
+                                              || e->xselectionclear.selection == qt_xa_clipboard)));
+}
+
+static bool selection_request_pending = false;
+
+static Bool check_selection_request_pending( Display*, XEvent* e, XPointer )
+    {
+    if( e->type == SelectionRequest && e->xselectionrequest.owner == owner->winId())
+        selection_request_pending = true;
+    return False;
+    }
+
+bool qt_xclb_wait_for_event( Display *dpy, Window win, int type, XEvent *event,
+			     int timeout )
+{
+    QTime started = QTime::currentTime();
+    QTime now = started;
+
+    if (qApp->eventLoop()->inherits("QMotif")) { // yes yes, evil hack, we know
+        if ( waiting_for_data )
+            qFatal( "QClipboard: internal error, qt_xclb_wait_for_event recursed" );
+
+        waiting_for_data = TRUE;
+        has_captured_event = FALSE;
+        capture_event_win = win;
+        capture_event_type = type;
+
+        QX11EventFilter old_event_filter = qt_set_x11_event_filter(qt_xclb_event_filter);
+
+        do {
+            if ( XCheckTypedWindowEvent(dpy,win,type,event) ) {
+                waiting_for_data = FALSE;
+                qt_set_x11_event_filter(old_event_filter);
+                return TRUE;
+            }
+
+            now = QTime::currentTime();
+            if ( started > now )			// crossed midnight
+                started = now;
+
+            // 0x08 == ExcludeTimers for X11 only
+            qApp->eventLoop()->processEvents( QEventLoop::ExcludeUserInput |
+                                              QEventLoop::ExcludeSocketNotifiers |
+                                              QEventLoop::WaitForMore | 0x08 );
+
+            if ( has_captured_event ) {
+                waiting_for_data = FALSE;
+                *event = captured_event;
+                qt_set_x11_event_filter(old_event_filter);
+                return TRUE;
+            }
+        } while ( started.msecsTo(now) < timeout );
+
+        waiting_for_data = FALSE;
+        qt_set_x11_event_filter(old_event_filter);
+
+        return FALSE;
+    }
+
+    bool flushed = FALSE;
+    do {
+        if ( XCheckTypedWindowEvent(dpy,win,type,event) )
+	    return TRUE;
+        if( qt_qclipboard_bailout_hack ) {
+            XEvent dummy;
+            selection_request_pending = false;
+            if ( owner != NULL )
+                XCheckIfEvent(dpy,&dummy,check_selection_request_pending,NULL);
+            if( selection_request_pending )
+	        return TRUE;
+        }
+
+        // process other clipboard events, since someone is probably requesting data from us
+        XEvent e;
+        if (XCheckIfEvent(dpy, &e, checkForClipboardEvents, 0))
+            qApp->x11ProcessEvent(&e);
+
+	now = QTime::currentTime();
+	if ( started > now )			// crossed midnight
+	    started = now;
+
+	if(!flushed) {
+	    XFlush( dpy );
+	    flushed = TRUE;
+	}
+
+	// sleep 50ms, so we don't use up CPU cycles all the time.
+	struct timeval usleep_tv;
+	usleep_tv.tv_sec = 0;
+	usleep_tv.tv_usec = 50000;
+	select(0, 0, 0, 0, &usleep_tv);
+    } while ( started.msecsTo(now) < timeout );
+
+    return FALSE;
+}
+
+
+static inline int maxSelectionIncr( Display *dpy )
+{ return XMaxRequestSize(dpy) > 65536 ? 65536*4 : XMaxRequestSize(dpy)*4 - 100; }
+
+// uglyhack: externed into qt_xdnd.cpp. qt is really not designed for
+// single-platform, multi-purpose blocks of code...
+bool qt_xclb_read_property( Display *dpy, Window win, Atom property,
+			   bool deleteProperty,
+			   QByteArray *buffer, int *size, Atom *type,
+			   int *format, bool nullterm )
+{
+    int	   maxsize = maxSelectionIncr(dpy);
+    ulong  bytes_left; // bytes_after
+    ulong  length;     // nitems
+    uchar *data;
+    Atom   dummy_type;
+    int    dummy_format;
+    int    r;
+
+    if ( !type )				// allow null args
+	type = &dummy_type;
+    if ( !format )
+	format = &dummy_format;
+
+    // Don't read anything, just get the size of the property data
+    r = XGetWindowProperty( dpy, win, property, 0, 0, False,
+			    AnyPropertyType, type, format,
+			    &length, &bytes_left, &data );
+    if (r != Success || (type && *type == None)) {
+	buffer->resize( 0 );
+	return FALSE;
+    }
+    XFree( (char*)data );
+
+    int  offset = 0, buffer_offset = 0, format_inc = 1, proplen = bytes_left;
+
+    VQDEBUG("QClipboard: read_property(): initial property length: %d", proplen);
+
+    switch (*format) {
+    case 8:
+    default:
+	format_inc = sizeof(char) / 1;
+	break;
+
+    case 16:
+	format_inc = sizeof(short) / 2;
+	proplen *= sizeof(short) / 2;
+	break;
+
+    case 32:
+	format_inc = sizeof(long) / 4;
+	proplen *= sizeof(long) / 4;
+	break;
+    }
+
+    bool ok = buffer->resize( proplen + (nullterm ? 1 : 0) );
+
+    VQDEBUG("QClipboard: read_property(): buffer resized to %d", buffer->size());
+
+    if ( ok ) {
+	// could allocate buffer
+
+	while ( bytes_left ) {
+	    // more to read...
+
+	    r = XGetWindowProperty( dpy, win, property, offset, maxsize/4,
+				    False, AnyPropertyType, type, format,
+				    &length, &bytes_left, &data );
+	    if (r != Success || (type && *type == None))
+		break;
+
+	    offset += length / (32 / *format);
+	    length *= format_inc * (*format) / 8;
+
+	    // Here we check if we get a buffer overflow and tries to
+	    // recover -- this shouldn't normally happen, but it doesn't
+	    // hurt to be defensive
+	    if (buffer_offset + length > buffer->size()) {
+		length = buffer->size() - buffer_offset;
+
+		// escape loop
+		bytes_left = 0;
+	    }
+
+	    memcpy(buffer->data() + buffer_offset, data, length);
+	    buffer_offset += length;
+
+	    XFree( (char*)data );
+	}
+
+ 	static Atom xa_compound_text = *qt_xdnd_str_to_atom( "COMPOUND_TEXT" );
+ 	if ( *format == 8 && *type == xa_compound_text ) {
+	    // convert COMPOUND_TEXT to a multibyte string
+ 	    XTextProperty textprop;
+ 	    textprop.encoding = *type;
+ 	    textprop.format = *format;
+ 	    textprop.nitems = length;
+ 	    textprop.value = (unsigned char *) buffer->data();
+
+ 	    char **list_ret = 0;
+ 	    int count;
+	    if ( XmbTextPropertyToTextList( dpy, &textprop, &list_ret,
+					    &count ) == Success &&
+		 count && list_ret ) {
+		offset = strlen( list_ret[0] );
+		buffer->resize( offset + ( nullterm ? 1 : 0 ) );
+		memcpy( buffer->data(), list_ret[0], offset );
+	    }
+ 	    if (list_ret) XFreeStringList(list_ret);
+ 	}
+
+	// zero-terminate (for text)
+       	if (nullterm)
+	    buffer->at(buffer_offset) = '\0';
+    }
+
+    // correct size, not 0-term.
+    if ( size )
+	*size = buffer_offset;
+
+    VQDEBUG("QClipboard: read_property(): buffer size %d, buffer offset %d, offset %d",
+	   buffer->size(), buffer_offset, offset);
+
+    if ( deleteProperty )
+	XDeleteProperty( dpy, win, property );
+
+    XFlush( dpy );
+
+    return ok;
+}
+
+
+// this is externed into qt_xdnd.cpp too.
+QByteArray qt_xclb_read_incremental_property( Display *dpy, Window win,
+					      Atom property, int nbytes,
+					      bool nullterm )
+{
+    XEvent event;
+
+    QByteArray buf;
+    QByteArray tmp_buf;
+    bool alloc_error = FALSE;
+    int  length;
+    int  offset = 0;
+
+    if ( nbytes > 0 ) {
+	// Reserve buffer + zero-terminator (for text data)
+	// We want to complete the INCR transfer even if we cannot
+	// allocate more memory
+	alloc_error = !buf.resize(nbytes+1);
+    }
+
+    for (;;) {
+	XFlush( dpy );
+	if ( !qt_xclb_wait_for_event(dpy,win,PropertyNotify,&event,clipboard_timeout) )
+	    break;
+	if ( event.xproperty.atom != property ||
+	     event.xproperty.state != PropertyNewValue )
+	    continue;
+	if ( qt_xclb_read_property(dpy, win, property, TRUE, &tmp_buf,
+				   &length,0, 0, FALSE) ) {
+	    if ( length == 0 ) {		// no more data, we're done
+		if ( nullterm ) {
+		    buf.resize( offset+1 );
+		    buf.at( offset ) = '\0';
+		} else {
+		    buf.resize(offset);
+		}
+		return buf;
+	    } else if ( !alloc_error ) {
+		if ( offset+length > (int)buf.size() ) {
+		    if ( !buf.resize(offset+length+65535) ) {
+			alloc_error = TRUE;
+			length = buf.size() - offset;
+		    }
+		}
+		memcpy( buf.data()+offset, tmp_buf.data(), length );
+		tmp_buf.resize( 0 );
+		offset += length;
+	    }
+	} else {
+	    break;
+	}
+    }
+
+    // timed out ... create a new requestor window, otherwise the requestor
+    // could consider next request to be still part of this timed out request
+    delete requestor;
+    requestor = new QWidget( 0, "internal clipboard requestor" );
+
+    return QByteArray();
+}
+
+static Atom send_selection(QClipboardData *d, Atom target, Window window, Atom property,
+			   int format = 0, QByteArray data = QByteArray());
+
+static Atom send_targets_selection(QClipboardData *d, Window window, Atom property)
+{
+    int atoms = 0;
+    while (d->source()->format(atoms)) atoms++;
+    if (d->source()->provides("image/ppm")) atoms++;
+    if (d->source()->provides("image/pbm")) atoms++;
+    if (d->source()->provides("text/plain")) atoms+=4;
+
+    VQDEBUG("QClipboard: send_targets_selection(): %d provided types", atoms);
+
+    // for 64 bit cleanness... XChangeProperty expects long* for data with format == 32
+    QByteArray data((atoms+3) * sizeof(long)); // plus TARGETS, MULTIPLE and TIMESTAMP
+    long *atarget = (long *) data.data();
+
+    const char *fmt;
+    int n = 0;
+    while ((fmt=d->source()->format(n)) && n < atoms)
+	atarget[n++] = *qt_xdnd_str_to_atom(fmt);
+
+    static Atom xa_text = *qt_xdnd_str_to_atom("TEXT");
+    static Atom xa_compound_text = *qt_xdnd_str_to_atom("COMPOUND_TEXT");
+    static Atom xa_targets = *qt_xdnd_str_to_atom("TARGETS");
+    static Atom xa_multiple = *qt_xdnd_str_to_atom("MULTIPLE");
+    static Atom xa_timestamp = *qt_xdnd_str_to_atom("TIMESTAMP");
+
+    if (d->source()->provides("image/ppm"))
+	atarget[n++] = XA_PIXMAP;
+    if (d->source()->provides("image/pbm"))
+	atarget[n++] = XA_BITMAP;
+    if (d->source()->provides("text/plain")) {
+	atarget[n++] = qt_utf8_string;
+	atarget[n++] = xa_text;
+	atarget[n++] = xa_compound_text;
+	atarget[n++] = XA_STRING;
+    }
+
+    atarget[n++] = xa_targets;
+    atarget[n++] = xa_multiple;
+    atarget[n++] = xa_timestamp;
+
+#if defined(QCLIPBOARD_DEBUG_VERBOSE)
+    for (int index = 0; index < n; index++) {
+	VQDEBUG("    atom %d: 0x%lx (%s)", index, atarget[index],
+	       qt_xdnd_atom_to_str(atarget[index]));
+    }
+#endif
+
+    XChangeProperty(QPaintDevice::x11AppDisplay(), window, property, XA_ATOM, 32,
+		    PropModeReplace, (uchar *) data.data(), n);
+    return property;
+}
+
+static Atom send_string_selection(QClipboardData *d, Atom target, Window window, Atom property)
+{
+    static Atom xa_text = *qt_xdnd_str_to_atom("TEXT");
+    static Atom xa_compound_text = *qt_xdnd_str_to_atom("COMPOUND_TEXT");
+
+    QDEBUG("QClipboard: send_string_selection():\n"
+	  "    property type %lx\n"
+	  "    property name '%s'",
+	  target, qt_xdnd_atom_to_str(target));
+
+    if (target == xa_text || target == xa_compound_text) {
+	// the ICCCM states that TEXT and COMPOUND_TEXT are in the
+	// encoding of choice, so we choose the encoding of the locale
+	QByteArray data = d->source()->encodedData("text/plain");
+	if(data.resize(data.size() + 1))
+	    data[int(data.size() - 1)] = '\0';
+	char *list[] = { data.data(), NULL };
+
+	XICCEncodingStyle style =
+	    (target == xa_compound_text) ? XCompoundTextStyle : XStdICCTextStyle;
+	XTextProperty textprop;
+	if (list[0] != NULL
+	    && XmbTextListToTextProperty(QPaintDevice::x11AppDisplay(),
+					 list, 1, style, &textprop) == Success) {
+	    QDEBUG("    textprop type %lx\n"
+		  "    textprop name '%s'\n"
+		  "    format %d\n"
+		  "    %ld items",
+		  textprop.encoding, qt_xdnd_atom_to_str(textprop.encoding),
+		  textprop.format, textprop.nitems);
+
+	    int sz = sizeof_format(textprop.format);
+	    data.duplicate((const char *) textprop.value, textprop.nitems * sz);
+	    XFree(textprop.value);
+
+	    return send_selection(d, textprop.encoding, window, property, textprop.format, data);
+	}
+
+	return None;
+    }
+
+    Atom xtarget = None;
+    const char *fmt = 0;
+    if (target == XA_STRING
+	|| (target == xa_text && QTextCodec::codecForLocale()->mibEnum() == 4)) {
+	// the ICCCM states that STRING is latin1 plus newline and tab
+	// see section 2.6.2
+	fmt = "text/plain;charset=ISO-8859-1";
+	xtarget = XA_STRING;
+    } else if (target == qt_utf8_string) {
+	// proposed UTF8_STRING conversion type
+	fmt = "text/plain;charset=UTF-8";
+	xtarget = qt_utf8_string;
+    }
+
+    if (xtarget == None) // should not happen
+	return None;
+
+    QByteArray data = d->source()->encodedData(fmt);
+
+    QDEBUG("    format 8\n    %d bytes", data.size());
+
+    return send_selection(d, xtarget, window, property, 8, data);
+}
+
+static Atom send_pixmap_selection(QClipboardData *d, Atom target, Window window, Atom property)
+{
+    QPixmap pm;
+
+    if ( target == XA_PIXMAP ) {
+	QByteArray data = d->source()->encodedData("image/ppm");
+	pm.loadFromData(data);
+    } else if ( target == XA_BITMAP ) {
+	QByteArray data = d->source()->encodedData("image/pbm");
+	QImage img;
+	img.loadFromData(data);
+	if ( img.depth() != 1 )
+	    img = img.convertDepth(1);
+    }
+
+    if (pm.isNull()) // should never happen
+	return None;
+
+    Pixmap handle = pm.handle();
+    XChangeProperty(QPaintDevice::x11AppDisplay(), window, property,
+		    target, 32, PropModeReplace, (uchar *) &handle, 1);
+    d->addTransferredPixmap(pm);
+    return property;
+
+}
+
+static Atom send_selection(QClipboardData *d, Atom target, Window window, Atom property,
+			   int format, QByteArray data)
+{
+    if (format == 0) format = 8;
+
+    if (data.isEmpty()) {
+	const char *fmt = qt_xdnd_atom_to_str(target);
+	QDEBUG("QClipboard: send_selection(): converting to type '%s'", fmt);
+	if (fmt && !d->source()->provides(fmt)) // Not a MIME type we can produce
+	    return None;
+	data = d->source()->encodedData(fmt);
+    }
+
+    QDEBUG("QClipboard: send_selection():\n"
+	  "    property type %lx\n"
+	  "    property name '%s'\n"
+	  "    format %d\n"
+	  "    %d bytes",
+	  target, qt_xdnd_atom_to_str(target), format, data.size());
+
+    // don't allow INCR transfers when using MULTIPLE or to
+    // Motif clients (since Motif doesn't support INCR)
+    static Atom motif_clip_temporary = *qt_xdnd_str_to_atom("CLIP_TEMPORARY");
+    bool allow_incr = property != motif_clip_temporary;
+
+    // X_ChangeProperty protocol request is 24 bytes
+    const unsigned int increment = (XMaxRequestSize(QPaintDevice::x11AppDisplay()) * 4) - 24;
+    if (data.size() > increment && allow_incr) {
+	long bytes = data.size();
+	XChangeProperty(QPaintDevice::x11AppDisplay(), window, property,
+			qt_x_incr, 32, PropModeReplace, (uchar *) &bytes, 1);
+
+	(void)new QClipboardINCRTransaction(window, property, target, format, data, increment);
+	return qt_x_incr;
+    }
+
+    // make sure we can perform the XChangeProperty in a single request
+    if (data.size() > increment)
+        return None; // ### perhaps use several XChangeProperty calls w/ PropModeAppend?
+
+    // use a single request to transfer data
+    XChangeProperty(QPaintDevice::x11AppDisplay(), window, property, target,
+		    format, PropModeReplace, (uchar *) data.data(),
+		    data.size() / sizeof_format(format));
+    return property;
+}
+
+/*! \internal
+    Internal cleanup for Windows.
+*/
+void QClipboard::ownerDestroyed()
+{ }
+
+
+/*! \internal
+    Internal optimization for Windows.
+*/
+void QClipboard::connectNotify( const char * )
+{ }
+
+
+/*! \reimp
+ */
+bool QClipboard::event( QEvent *e )
+{
+    if ( e->type() == QEvent::Timer ) {
+	QTimerEvent *te = (QTimerEvent *) e;
+
+	if ( waiting_for_data ) // should never happen
+	    return FALSE;
+
+	if (te->timerId() == timer_id) {
+	    killTimer(timer_id);
+	    timer_id = 0;
+
+	    timer_event_clear = TRUE;
+	    if ( selection_watcher ) // clear selection
+		selectionData()->clear();
+	    if ( clipboard_watcher ) // clear clipboard
+		clipboardData()->clear();
+	    timer_event_clear = FALSE;
+
+	    return TRUE;
+	} else if ( te->timerId() == pending_timer_id ) {
+	    // I hate klipper
+	    killTimer( pending_timer_id );
+	    pending_timer_id = 0;
+
+	    if ( pending_clipboard_changed ) {
+		pending_clipboard_changed = FALSE;
+		clipboardData()->clear();
+		emit dataChanged();
+	    }
+	    if ( pending_selection_changed ) {
+		pending_selection_changed = FALSE;
+		selectionData()->clear();
+		emit selectionChanged();
+	    }
+
+	    return TRUE;
+	} else if (te->timerId() == incr_timer_id) {
+	    killTimer(incr_timer_id);
+	    incr_timer_id = 0;
+
+	    qt_xclb_incr_timeout();
+
+	    return TRUE;
+	} else {
+	    return QObject::event( e );
+	}
+    } else if ( e->type() != QEvent::Clipboard ) {
+	return QObject::event( e );
+    }
+
+    XEvent *xevent = (XEvent *)(((QCustomEvent *)e)->data());
+    Display *dpy = QPaintDevice::x11AppDisplay();
+
+    if ( !xevent )
+	return TRUE;
+
+    switch ( xevent->type ) {
+
+    case SelectionClear:
+	// new selection owner
+	if (xevent->xselectionclear.selection == XA_PRIMARY) {
+	    QClipboardData *d = selectionData();
+
+	    // ignore the event if it was generated before we gained selection ownership
+	    if (d->timestamp != CurrentTime && xevent->xselectionclear.time < d->timestamp)
+		break;
+
+	    QDEBUG("QClipboard: new selection owner 0x%lx at time %lx (ours %lx)",
+		  XGetSelectionOwner(dpy, XA_PRIMARY),
+		  xevent->xselectionclear.time, d->timestamp);
+
+	    if ( ! waiting_for_data ) {
+		d->clear();
+		emit selectionChanged();
+	    } else {
+		pending_selection_changed = TRUE;
+		if ( ! pending_timer_id )
+		    pending_timer_id = QApplication::clipboard()->startTimer( 0 );
+	    }
+	} else if (xevent->xselectionclear.selection == qt_xa_clipboard) {
+	    QClipboardData *d = clipboardData();
+
+	    // ignore the event if it was generated before we gained selection ownership
+	    if (d->timestamp != CurrentTime && xevent->xselectionclear.time < d->timestamp)
+		break;
+
+	    QDEBUG("QClipboard: new clipboard owner 0x%lx at time %lx (%lx)",
+		  XGetSelectionOwner(dpy, qt_xa_clipboard),
+		  xevent->xselectionclear.time, d->timestamp);
+
+	    if ( ! waiting_for_data ) {
+		d->clear();
+		emit dataChanged();
+	    } else {
+		pending_clipboard_changed = TRUE;
+		if ( ! pending_timer_id )
+		    pending_timer_id = QApplication::clipboard()->startTimer( 0 );
+	    }
+	} else {
+#ifdef QT_CHECK_STATE
+	    qWarning("QClipboard: Unknown SelectionClear event received.");
+#endif
+	    return FALSE;
+	}
+	break;
+
+    case SelectionNotify:
+	/*
+	  Something has delivered data to us, but this was not caught
+	  by QClipboardWatcher::getDataInFormat()
+
+	  Just skip the event to prevent Bad Things (tm) from
+	  happening later on...
+	*/
+	break;
+
+    case SelectionRequest:
+	{
+	    // someone wants our data
+	    XSelectionRequestEvent *req = &xevent->xselectionrequest;
+
+	    if (requestor && req->requestor == requestor->winId())
+                break;
+
+	    XEvent event;
+	    event.xselection.type      = SelectionNotify;
+	    event.xselection.display   = req->display;
+	    event.xselection.requestor = req->requestor;
+	    event.xselection.selection = req->selection;
+	    event.xselection.target    = req->target;
+	    event.xselection.property  = None;
+	    event.xselection.time      = req->time;
+
+	    QDEBUG("QClipboard: SelectionRequest from %lx\n"
+		  "    selection 0x%lx (%s) target 0x%lx (%s)",
+		  req->requestor,
+		  req->selection,
+		  qt_xdnd_atom_to_str(req->selection),
+		  req->target,
+		  qt_xdnd_atom_to_str(req->target));
+
+	    QClipboardData *d;
+
+	    if ( req->selection == XA_PRIMARY ) {
+		d = selectionData();
+	    } else if ( req->selection == qt_xa_clipboard ) {
+		d = clipboardData();
+	    } else {
+#ifdef QT_CHECK_RANGE
+		qWarning("QClipboard: unknown selection '%lx'", req->selection);
+#endif // QT_CHECK_RANGE
+
+		XSendEvent(dpy, req->requestor, False, NoEventMask, &event);
+		break;
+	    }
+
+	    if (! d->source()) {
+#ifdef QT_CHECK_STATE
+		qWarning("QClipboard: cannot transfer data, no data available");
+#endif // QT_CHECK_STATE
+
+		XSendEvent(dpy, req->requestor, False, NoEventMask, &event);
+		break;
+	    }
+
+	    QDEBUG("QClipboard: SelectionRequest at time %lx (ours %lx)",
+		  req->time, d->timestamp);
+
+	    if (d->timestamp == CurrentTime // we don't own the selection anymore
+		|| (req->time != CurrentTime && req->time < d->timestamp)) {
+		QDEBUG("QClipboard: SelectionRequest too old");
+		XSendEvent(dpy, req->requestor, False, NoEventMask, &event);
+		break;
+	    }
+
+	    static Atom xa_text = *qt_xdnd_str_to_atom("TEXT");
+	    static Atom xa_compound_text = *qt_xdnd_str_to_atom("COMPOUND_TEXT");
+	    static Atom xa_targets = *qt_xdnd_str_to_atom("TARGETS");
+	    static Atom xa_multiple = *qt_xdnd_str_to_atom("MULTIPLE");
+	    static Atom xa_timestamp = *qt_xdnd_str_to_atom("TIMESTAMP");
+
+	    struct AtomPair { Atom target; Atom property; } *multi = 0;
+	    Atom multi_type = None;
+	    int multi_format = 0;
+	    int nmulti = 0;
+	    int imulti = -1;
+	    bool multi_writeback = FALSE;
+
+	    if ( req->target == xa_multiple ) {
+		QByteArray multi_data;
+		if (req->property == None
+		    || !qt_xclb_read_property(dpy, req->requestor, req->property,
+					      FALSE, &multi_data, 0, &multi_type, &multi_format, 0)
+		    || multi_format != 32) {
+		    // MULTIPLE property not formatted correctly
+		    XSendEvent(dpy, req->requestor, False, NoEventMask, &event);
+		    break;
+		}
+		nmulti = multi_data.size()/sizeof(*multi);
+		multi = new AtomPair[nmulti];
+		memcpy(multi,multi_data.data(),multi_data.size());
+		imulti = 0;
+	    }
+
+	    for (; imulti < nmulti; ++imulti) {
+		Atom target;
+		Atom property;
+
+		if ( multi ) {
+		    target = multi[imulti].target;
+		    property = multi[imulti].property;
+		} else {
+		    target = req->target;
+		    property = req->property;
+		    if (property == None) // obsolete client
+			property = target;
+		}
+
+		Atom ret = None;
+		if (target == None || property == None) {
+		    ;
+		} else if (target == xa_timestamp) {
+		    if (d->timestamp != CurrentTime) {
+			XChangeProperty(dpy, req->requestor, property, xa_timestamp, 32,
+					PropModeReplace, (uchar *) &d->timestamp, 1);
+			ret = property;
+		    } else {
+
+#ifdef QT_CHECK_STATE
+			qWarning("QClipboard: invalid data timestamp");
+#endif // QT_CHECK_STATE
+		    }
+		} else if (target == xa_targets) {
+		    ret = send_targets_selection(d, req->requestor, property);
+		} else if (target == XA_STRING
+			   || target == xa_text
+			   || target == xa_compound_text
+			   || target == qt_utf8_string) {
+		    ret = send_string_selection(d, target, req->requestor, property);
+		} else if (target == XA_PIXMAP
+			   || target == XA_BITMAP) {
+		    ret = send_pixmap_selection(d, target, req->requestor, property);
+		} else {
+		    ret = send_selection(d, target, req->requestor, property);
+		}
+
+		if (nmulti > 0) {
+		    if (ret == None) {
+			multi[imulti].property = None;
+			multi_writeback = TRUE;
+		    }
+		} else {
+		    event.xselection.property = ret;
+		    break;
+		}
+	    }
+
+	    if (nmulti > 0) {
+		if (multi_writeback) {
+		    // according to ICCCM 2.6.2 says to put None back
+		    // into the original property on the requestor window
+		    XChangeProperty(dpy, req->requestor, req->property, multi_type, 32,
+				    PropModeReplace, (uchar *) multi, nmulti * 2);
+		}
+
+		delete [] multi;
+		event.xselection.property = req->property;
+	    }
+
+	    // send selection notify to requestor
+	    XSendEvent(dpy, req->requestor, False, NoEventMask, &event);
+
+	    QDEBUG("QClipboard: SelectionNotify to 0x%lx\n"
+		  "    property 0x%lx (%s)",
+		  req->requestor, event.xselection.property,
+		  qt_xdnd_atom_to_str(event.xselection.property));
+	}
+	break;
+    }
+
+    return TRUE;
+}
+
+
+
+
+
+
+QClipboardWatcher::QClipboardWatcher( QClipboard::Mode mode )
+{
+    switch ( mode ) {
+    case QClipboard::Selection:
+	atom = XA_PRIMARY;
+	break;
+
+    case QClipboard::Clipboard:
+	atom = qt_xa_clipboard;
+	break;
+
+#ifdef QT_CHECK_RANGE
+    default:
+	qWarning( "QClipboardWatcher: internal error, unknown clipboard mode" );
+	break;
+#endif // QT_CHECK_RANGE
+    }
+
+    setupOwner();
+}
+
+QClipboardWatcher::~QClipboardWatcher()
+{
+    if( selection_watcher == this )
+        selection_watcher = 0;
+    if( clipboard_watcher == this )
+        clipboard_watcher = 0;
+}
+
+bool QClipboardWatcher::empty() const
+{
+    Display *dpy = QPaintDevice::x11AppDisplay();
+    Window win = XGetSelectionOwner( dpy, atom );
+
+#ifdef QT_CHECK_STATE
+    if( win == requestor->winId()) {
+        qWarning( "QClipboardWatcher::empty: internal error, app owns the selection" );
+        return TRUE;
+    }
+#endif // QT_CHECK_STATE
+
+    return win == None;
+}
+
+const char* QClipboardWatcher::format( int n ) const
+{
+    if ( empty() )
+	return 0;
+
+    if (! formatList.count()) {
+	// get the list of targets from the current clipboard owner - we do this
+	// once so that multiple calls to this function don't require multiple
+	// server round trips...
+	static Atom xa_targets = *qt_xdnd_str_to_atom( "TARGETS" );
+
+	QClipboardWatcher *that = (QClipboardWatcher *) this;
+	QByteArray ba = getDataInFormat(xa_targets);
+	if (ba.size() > 0) {
+	    Atom *unsorted_target = (Atom *) ba.data();
+	    static Atom xa_text = *qt_xdnd_str_to_atom( "TEXT" );
+	    static Atom xa_compound_text = *qt_xdnd_str_to_atom( "COMPOUND_TEXT" );
+	    int i, size = ba.size() / sizeof(Atom);
+
+	    // sort TARGETS to prefer some types over others.  some apps
+	    // will report XA_STRING before COMPOUND_TEXT, and we want the
+	    // latter, not the former (if it is present).
+	    Atom* target = new Atom[size+4];
+	    memset( target, 0, (size+4) * sizeof(Atom) );
+
+	    for ( i = 0; i < size; ++i ) {
+		if ( unsorted_target[i] == qt_utf8_string )
+		    target[0] = unsorted_target[i];
+		else if ( unsorted_target[i] == xa_compound_text )
+		    target[1] = unsorted_target[i];
+		else if ( unsorted_target[i] == xa_text )
+		    target[2] = unsorted_target[i];
+		else if ( unsorted_target[i] == XA_STRING )
+		    target[3] = unsorted_target[i];
+		else
+		    target[i + 4] = unsorted_target[i];
+	    }
+
+	    for (i = 0; i < size + 4; ++i) {
+		if ( target[i] == 0 ) continue;
+
+		VQDEBUG("    format: %s", qt_xdnd_atom_to_str(target[i]));
+
+		if ( target[i] == XA_PIXMAP )
+		    that->formatList.append("image/ppm");
+		else if ( target[i] == XA_STRING )
+		    that->formatList.append( "text/plain;charset=ISO-8859-1" );
+		else if ( target[i] == qt_utf8_string )
+		    that->formatList.append( "text/plain;charset=UTF-8" );
+		else if ( target[i] == xa_text ||
+			  target[i] == xa_compound_text )
+		    that->formatList.append( "text/plain" );
+		else
+		    that->formatList.append(qt_xdnd_atom_to_str(target[i]));
+	    }
+	    delete []target;
+
+	    QDEBUG("QClipboardWatcher::format: %d formats available",
+		  int(that->formatList.count()));
+	}
+    }
+
+    if (n >= 0 && n < (signed) formatList.count())
+	return formatList[n];
+    if (n == 0)
+	return "text/plain";
+    return 0;
+}
+
+QByteArray QClipboardWatcher::encodedData( const char* fmt ) const
+{
+    if ( !fmt || empty() )
+	return QByteArray( 0 );
+
+    QDEBUG("QClipboardWatcher::encodedData: fetching format '%s'", fmt);
+
+    Atom fmtatom = 0;
+
+    if ( 0==qstricmp(fmt,"text/plain;charset=iso-8859-1") ) {
+	// ICCCM section 2.6.2 says STRING is latin1 text
+	fmtatom = XA_STRING;
+    } else if ( 0==qstricmp(fmt,"text/plain;charset=utf-8") ) {
+	// proprosed UTF8_STRING conversion type
+	fmtatom = *qt_xdnd_str_to_atom( "UTF8_STRING" );
+    } else if ( 0==qstrcmp(fmt,"text/plain") ) {
+   	fmtatom = *qt_xdnd_str_to_atom( "COMPOUND_TEXT" );
+    } else if ( 0==qstrcmp(fmt,"image/ppm") ) {
+	fmtatom = XA_PIXMAP;
+	QByteArray pmd = getDataInFormat(fmtatom);
+	if ( pmd.size() == sizeof(Pixmap) ) {
+	    Pixmap xpm = *((Pixmap*)pmd.data());
+	    Display *dpy = QPaintDevice::x11AppDisplay();
+	    Window r;
+	    int x,y;
+	    uint w,h,bw,d;
+	    if ( ! xpm )
+		return QByteArray( 0 );
+	    XGetGeometry(dpy,xpm, &r,&x,&y,&w,&h,&bw,&d);
+	    QImageIO iio;
+	    GC gc = XCreateGC( dpy, xpm, 0, 0 );
+	    if ( d == 1 ) {
+		QBitmap qbm(w,h);
+		XCopyArea(dpy,xpm,qbm.handle(),gc,0,0,w,h,0,0);
+		iio.setFormat("PBMRAW");
+		iio.setImage(qbm.convertToImage());
+	    } else {
+		QPixmap qpm(w,h);
+		XCopyArea(dpy,xpm,qpm.handle(),gc,0,0,w,h,0,0);
+		iio.setFormat("PPMRAW");
+		iio.setImage(qpm.convertToImage());
+	    }
+	    XFreeGC(dpy,gc);
+	    QBuffer buf;
+	    buf.open(IO_WriteOnly);
+	    iio.setIODevice(&buf);
+	    iio.write();
+	    return buf.buffer();
+	} else {
+	    fmtatom = *qt_xdnd_str_to_atom(fmt);
+	}
+    } else {
+	fmtatom = *qt_xdnd_str_to_atom(fmt);
+    }
+    return getDataInFormat(fmtatom);
+}
+
+QByteArray QClipboardWatcher::getDataInFormat(Atom fmtatom) const
+{
+    QByteArray buf;
+
+    Display *dpy = QPaintDevice::x11AppDisplay();
+    Window   win = requestor->winId();
+
+    QDEBUG("QClipboardWatcher::getDataInFormat: selection '%s' format '%s'",
+	  qt_xdnd_atom_to_str(atom), qt_xdnd_atom_to_str(fmtatom));
+
+    XSelectInput(dpy, win, NoEventMask); // don't listen for any events
+
+    XDeleteProperty(dpy, win, qt_selection_property);
+    XConvertSelection(dpy, atom, fmtatom, qt_selection_property, win, qt_x_time);
+    XSync(dpy, FALSE);
+
+    VQDEBUG("QClipboardWatcher::getDataInFormat: waiting for SelectionNotify event");
+
+    XEvent xevent;
+    if ( !qt_xclb_wait_for_event(dpy,win,SelectionNotify,&xevent,clipboard_timeout) ||
+	 xevent.xselection.property == None ) {
+	QDEBUG("QClipboardWatcher::getDataInFormat: format not available");
+	return buf;
+    }
+
+    VQDEBUG("QClipboardWatcher::getDataInFormat: fetching data...");
+
+    Atom   type;
+    XSelectInput(dpy, win, PropertyChangeMask);
+
+    if ( qt_xclb_read_property(dpy,win,qt_selection_property,TRUE,
+			       &buf,0,&type,0,FALSE) ) {
+	if ( type == qt_x_incr ) {
+	    int nbytes = buf.size() >= 4 ? *((int*)buf.data()) : 0;
+	    buf = qt_xclb_read_incremental_property( dpy, win,
+						     qt_selection_property,
+						     nbytes, FALSE );
+	}
+    }
+
+    XSelectInput(dpy, win, NoEventMask);
+
+    QDEBUG("QClipboardWatcher::getDataInFormat: %d bytes received", buf.size());
+
+    return buf;
+}
+
+
+QMimeSource* QClipboard::data( Mode mode ) const
+{
+    QClipboardData *d;
+    switch ( mode ) {
+    case Selection: d = selectionData(); break;
+    case Clipboard: d = clipboardData(); break;
+
+    default:
+#ifdef QT_CHECK_RANGE
+	qWarning( "QClipboard::data: invalid mode '%d'", mode );
+#endif // QT_CHECK_RANGE
+	return 0;
+    }
+
+    if ( ! d->source() && ! timer_event_clear ) {
+	if ( mode == Selection ) {
+	    if ( ! selection_watcher )
+		selection_watcher = new QClipboardWatcher( mode );
+	    d->setSource( selection_watcher );
+	} else {
+	    if ( ! clipboard_watcher )
+		clipboard_watcher = new QClipboardWatcher( mode );
+	    d->setSource( clipboard_watcher );
+	}
+
+	if (! timer_id) {
+	    // start a zero timer - we will clear cached data when the timer
+	    // times out, which will be the next time we hit the event loop...
+	    // that way, the data is cached long enough for calls within a single
+	    // loop/function, but the data doesn't linger around in case the selection
+	    // changes
+	    QClipboard *that = ((QClipboard *) this);
+	    timer_id = that->startTimer(0);
+	}
+    }
+
+    return d->source();
+}
+
+
+void QClipboard::setData( QMimeSource* src, Mode mode )
+{
+    Atom atom, sentinel_atom;
+    QClipboardData *d;
+    switch ( mode ) {
+    case Selection:
+	atom = XA_PRIMARY;
+	sentinel_atom = qt_selection_sentinel;
+	d = selectionData();
+	break;
+
+    case Clipboard:
+	atom = qt_xa_clipboard;
+	sentinel_atom = qt_clipboard_sentinel;
+	d = clipboardData();
+	break;
+
+    default:
+#ifdef QT_CHECK_RANGE
+	qWarning( "QClipboard::data: invalid mode '%d'", mode );
+#endif // QT_CHECK_RANGE
+	return;
+    }
+
+    Display *dpy = QPaintDevice::x11AppDisplay();
+    Window newOwner;
+
+    if (! src) { // no data, clear clipboard contents
+	newOwner = None;
+	d->clear();
+    } else {
+	setupOwner();
+
+	newOwner = owner->winId();
+
+	d->setSource(src);
+	d->timestamp = qt_x_time;
+    }
+
+    Window prevOwner = XGetSelectionOwner( dpy, atom );
+    // use qt_x_time, since d->timestamp == CurrentTime when clearing
+    XSetSelectionOwner(dpy, atom, newOwner, qt_x_time);
+
+    if ( mode == Selection )
+	emit selectionChanged();
+    else
+	emit dataChanged();
+
+    if (XGetSelectionOwner(dpy, atom) != newOwner) {
+#ifdef QT_CHECK_STATE
+	qWarning("QClipboard::setData: Cannot set X11 selection owner for %s",
+		 qt_xdnd_atom_to_str(atom));
+#endif // QT_CHECK_STATE
+
+	d->clear();
+	return;
+    }
+
+    // Signal to other Qt processes that the selection has changed
+    Window owners[2];
+    owners[0] = newOwner;
+    owners[1] = prevOwner;
+    XChangeProperty( dpy, QApplication::desktop()->screen(0)->winId(),
+		     sentinel_atom, XA_WINDOW, 32, PropModeReplace,
+		     (unsigned char*)&owners, 2 );
+}
+
+
+/*
+  Called by the main event loop in qapplication_x11.cpp when the
+  _QT_SELECTION_SENTINEL property has been changed (i.e. when some Qt
+  process has performed QClipboard::setData(). If it returns TRUE, the
+  QClipBoard dataChanged() signal should be emitted.
+*/
+
+bool qt_check_selection_sentinel()
+{
+    bool doIt = TRUE;
+    if ( owner ) {
+	/*
+	  Since the X selection mechanism cannot give any signal when
+	  the selection has changed, we emulate it (for Qt processes) here.
+	  The notification should be ignored in case of either
+	  a) This is the process that did setData (because setData()
+	  then has already emitted dataChanged())
+	  b) This is the process that owned the selection when dataChanged()
+	  was called (because we have then received a SelectionClear event,
+	  and have already emitted dataChanged() as a result of that)
+	*/
+
+	Window* owners;
+	Atom actualType;
+	int actualFormat;
+	ulong nitems;
+	ulong bytesLeft;
+
+	if (XGetWindowProperty(QPaintDevice::x11AppDisplay(),
+			       QApplication::desktop()->screen(0)->winId(),
+			       qt_selection_sentinel, 0, 2, False, XA_WINDOW,
+			       &actualType, &actualFormat, &nitems,
+			       &bytesLeft, (unsigned char**)&owners) == Success) {
+	    if ( actualType == XA_WINDOW && actualFormat == 32 && nitems == 2 ) {
+		Window win = owner->winId();
+		if ( owners[0] == win || owners[1] == win )
+		    doIt = FALSE;
+	    }
+
+	    XFree( owners );
+	}
+    }
+
+    if (doIt) {
+	if ( waiting_for_data ) {
+	    pending_selection_changed = TRUE;
+	    if ( ! pending_timer_id )
+		pending_timer_id = QApplication::clipboard()->startTimer( 0 );
+	    doIt = FALSE;
+	} else {
+	    selectionData()->clear();
+	}
+    }
+
+    return doIt;
+}
+
+
+bool qt_check_clipboard_sentinel()
+{
+    bool doIt = TRUE;
+    if (owner) {
+	Window *owners;
+	Atom actualType;
+	int actualFormat;
+	unsigned long nitems, bytesLeft;
+
+	if (XGetWindowProperty(QPaintDevice::x11AppDisplay(),
+			       QApplication::desktop()->screen(0)->winId(),
+			       qt_clipboard_sentinel, 0, 2, False, XA_WINDOW,
+			       &actualType, &actualFormat, &nitems, &bytesLeft,
+			       (unsigned char **) &owners) == Success) {
+	    if (actualType == XA_WINDOW && actualFormat == 32 && nitems == 2) {
+		Window win = owner->winId();
+		if (owners[0] == win || owners[1] == win)
+		    doIt = FALSE;
+	    }
+
+	    XFree(owners);
+	}
+    }
+
+    if (doIt) {
+	if ( waiting_for_data ) {
+	    pending_clipboard_changed = TRUE;
+	    if ( ! pending_timer_id )
+		pending_timer_id = QApplication::clipboard()->startTimer( 0 );
+	    doIt = FALSE;
+	} else {
+	    clipboardData()->clear();
+	}
+    }
+
+    return doIt;
+}
+
+#endif // QT_NO_CLIPBOARD