summaryrefslogtreecommitdiffstats
path: root/src/gui/kernel/qmotifdnd_x11.cpp
blob: bdf709207036e511b13882b1863291effeae0bcc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights.  These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

/* The following copyright notice pertains to the code as contributed
to Nokia, not to Nokia's modifications. It is replicated
in doc/dnd.doc, where the documentation system can see it. */

/* Copyright 1996 Daniel Dardailler.

   Permission to use, copy, modify, distribute, and sell this software
   for any purpose is hereby granted without fee, provided that the above
   copyright notice appear in all copies and that both that copyright
   notice and this permission notice appear in supporting documentation,
   and that the name of Daniel Dardailler not be used in advertising or
   publicity pertaining to distribution of the software without specific,
   written prior permission.  Daniel Dardailler makes no representations
   about the suitability of this software for any purpose.  It is
   provided "as is" without express or implied warranty.

   Modifications Copyright 1999 Matt Koss, under the same license as
   above.
************************************************************/

/***********************************************************/
/* Motif Drag&Drop Dynamic Protocol messaging API code */
/* Only requires Xlib layer - not MT safe */
/* Author: Daniel Dardailler, daniel@x.org */
/* Adapted by: Matt Koss, koss@napri.sk */
/* Further adaptions by: Nokia Corporation and/or its subsidiary(-ies) */
/***********************************************************/

#include "qplatformdefs.h"

#include "qapplication.h"

#ifndef QT_NO_DRAGANDDROP

#include "qdebug.h"
#include "qtextcodec.h"
#include "qwidget.h"
#include "qevent.h"
#include "qt_x11_p.h"
#include "qx11info_x11.h"
#include "qiodevice.h"
#include "qdnd_p.h"

#include <stdlib.h>

QT_BEGIN_NAMESPACE

static Window sourceWindow = XNone;
static QWidget *dropWidget = 0;
static Qt::DropAction lastAcceptedAction = Qt::IgnoreAction;

static Atom Dnd_selection = 0;
static Time Dnd_selection_time;

static Atom * src_targets ;
static ushort num_src_targets ;

// Motif definitions
#define DndVersion 1
#define DndRevision 0
#define DndIncludeVersion (DndVersion * 10 + DndRevision)

/* The following values are used in the DndData structure */

/* protocol style */
#define DND_DRAG_NONE            0
#define DND_DRAG_DROP_ONLY       1
#define DND_DRAG_DYNAMIC         5

/* message type */
#define DND_TOP_LEVEL_ENTER   0
#define DND_TOP_LEVEL_LEAVE   1
#define DND_DRAG_MOTION       2
#define DND_DROP_SITE_ENTER   3
#define DND_DROP_SITE_LEAVE   4
#define DND_DROP_START        5
#define DND_OPERATION_CHANGED 8

/* operation(s) */
#define DND_NOOP        0L
#define DND_MOVE         (1L << 0)
#define DND_COPY        (1L << 1)
#define DND_LINK        (1L << 2)

static Qt::DropActions DndOperationsToQtDropActions(uchar op)
{
    Qt::DropActions actions = Qt::IgnoreAction;
    if (op | DND_MOVE)
        actions |= Qt::MoveAction;
    if (op | DND_COPY)
        actions |= Qt::CopyAction;
    if (op | DND_LINK)
        actions |= Qt::LinkAction;
    return actions;
}

static uchar QtDropActionToDndOperation(Qt::DropAction action)
{
    switch (action & Qt::ActionMask) {
    case Qt::CopyAction:
    default:
        return DND_COPY;
    case Qt::MoveAction:
        return DND_MOVE;
    case Qt::LinkAction:
        return DND_LINK;
    }
}


/* status */
#define DND_NO_DROP_SITE        1
#define DND_INVALID_DROP_SITE   2
#define DND_VALID_DROP_SITE        3

/* completion */
#define DND_DROP        0
#define DND_DROP_HELP   1
#define DND_DROP_CANCEL 2

#define BYTE unsigned char
#define CARD32 unsigned int
#define CARD16 unsigned short
#define INT16  signed short

/* Client side structure used in the API */
typedef struct {
    unsigned char       reason;  /* message type: DND_TOP_LEVEL_ENTER, etc */
    Time                time ;
    unsigned char       operation;
    unsigned char       operations;
    unsigned char       status;
    unsigned char       completion;
    short               x ;
    short               y ;
    Window              src_window ;
    Atom                property ;
} DndData ;


typedef struct _DndSrcProp {
    BYTE                byte_order ;
    BYTE                protocol_version ;
    CARD16              target_index ;
    CARD32              selection ;
} DndSrcProp ;

typedef struct _DndReceiverProp {
    BYTE                byte_order ;
    BYTE                protocol_version ;
    BYTE                protocol_style ;
    BYTE                pad1;
    CARD32              proxy_window;
    CARD16              num_drop_sites ;
    CARD16              pad2;
    CARD32              total_size;
} DndReceiverProp ;

/* need to use some union hack since window and property are in
   different order depending on the message ... */
typedef struct _DndTop {
    CARD32                src_window;
    CARD32                property;
} DndTop ;

typedef struct _DndPot {
    INT16                x;
    INT16                y;
    CARD32                property;
    CARD32                src_window;
} DndPot ;

typedef struct _DndMessage {
    BYTE                reason;
    BYTE                byte_order;
    CARD16                flags;
    CARD32                time;
    union {
        DndTop top ;
        DndPot pot ;
    } data ;
} DndMessage ;

typedef struct {
    BYTE        byte_order;
    BYTE        protocol_version;
    CARD16        num_target_lists;
    CARD32        data_size;
    /* then come series of CARD16,CARD32,CARD32,CARD32... */
} DndTargets;


/* protocol version */
#define DND_PROTOCOL_VERSION 0


#define DND_EVENT_TYPE_MASK  ((BYTE)0x80)
#define DND_EVENT_TYPE_SHIFT 7
#define DND_CLEAR_EVENT_TYPE  ((BYTE)0x7F)

/* message_type is data[0] of the client_message
   this return 1 (receiver bit up) or 0 (initiator) */
#define DND_GET_EVENT_TYPE(message_type) \
((char) (((message_type) & DND_EVENT_TYPE_MASK) >> DND_EVENT_TYPE_SHIFT))

/* event_type can be 0 (initiator) or 1 (receiver) */
#define DND_SET_EVENT_TYPE(event_type) \
(((BYTE)(event_type) << DND_EVENT_TYPE_SHIFT) & DND_EVENT_TYPE_MASK)


#define DND_OPERATION_MASK ((CARD16) 0x000F)
#define DND_OPERATION_SHIFT 0
#define DND_STATUS_MASK ((CARD16) 0x00F0)
#define DND_STATUS_SHIFT 4
#define DND_OPERATIONS_MASK ((CARD16) 0x0F00)
#define DND_OPERATIONS_SHIFT 8
#define DND_COMPLETION_MASK ((CARD16) 0xF000)
#define DND_COMPLETION_SHIFT 12

#define DND_GET_OPERATION(flags) \
((unsigned char) \
(((flags) & DND_OPERATION_MASK) >> DND_OPERATION_SHIFT))

#define DND_SET_OPERATION(operation) \
(((CARD16)(operation) << DND_OPERATION_SHIFT)\
& DND_OPERATION_MASK)

#define DND_GET_STATUS(flags) \
((unsigned char) \
(((flags) & DND_STATUS_MASK) >> DND_STATUS_SHIFT))

#define DND_SET_STATUS(status) \
(((CARD16)(status) << DND_STATUS_SHIFT)\
& DND_STATUS_MASK)

#define DND_GET_OPERATIONS(flags) \
((unsigned char) \
(((flags) & DND_OPERATIONS_MASK) >> DND_OPERATIONS_SHIFT))

#define DND_SET_OPERATIONS(operation) \
(((CARD16)(operation) << DND_OPERATIONS_SHIFT)\
& DND_OPERATIONS_MASK)

#define DND_GET_COMPLETION(flags) \
((unsigned char) \
(((flags) & DND_COMPLETION_MASK) >> DND_COMPLETION_SHIFT))

#define DND_SET_COMPLETION(completion) \
(((CARD16)(completion) << DND_COMPLETION_SHIFT)\
& DND_COMPLETION_MASK)


#define SWAP4BYTES(l) {\
struct { unsigned t :32;} bit32;\
char n, *tp = (char *) &bit32;\
bit32.t = l;\
n = tp[0]; tp[0] = tp[3]; tp[3] = n;\
n = tp[1]; tp[1] = tp[2]; tp[2] = n;\
l = bit32.t;\
}

#define SWAP2BYTES(s) {\
struct { unsigned t :16; } bit16;\
char n, *tp = (char *) &bit16;\
bit16.t = s;\
n = tp[0]; tp[0] = tp[1]; tp[1] = n;\
s = bit16.t;\
}


/** Private extern functions */

static unsigned char DndByteOrder ();


/***** Targets/Index stuff */

typedef struct {
    int            num_targets;
    Atom    *targets;
} DndTargetsTableEntryRec, * DndTargetsTableEntry;

typedef struct {
    int        num_entries;
    DndTargetsTableEntry entries;
} DndTargetsTableRec, * DndTargetsTable;


static ushort _DndIndexToTargets(Display * display,
                                 int index,
                                 Atom ** targets);

extern void qt_x11_intern_atom(const char *, Atom *);

/////////////////////////////////////////////////////////////////

static unsigned char DndByteOrder ()
{
    static unsigned char byte_order = 0;

    if (!byte_order) {
        unsigned int endian = 1;
        byte_order = (*((char *)&endian))?'l':'B';
    }
    return byte_order ;
}



static void DndReadSourceProperty(Display * dpy,
                                  Window window, Atom dnd_selection,
                                  Atom ** targets, unsigned short * num_targets)
{
    unsigned char *retval = 0;
    Atom type ;
    int format ;
    unsigned long bytesafter, lengthRtn;

    if ((XGetWindowProperty (dpy, window, dnd_selection, 0L, 100000L,
                             False, ATOM(_MOTIF_DRAG_INITIATOR_INFO), &type,
                             &format, &lengthRtn, &bytesafter,
                             &retval) != Success)
        || (type == XNone)) {
        *num_targets = 0;
        return ;
    }

    DndSrcProp * src_prop = (DndSrcProp *)retval;

    if (src_prop->byte_order != DndByteOrder()) {
        SWAP2BYTES(src_prop->target_index);
        SWAP4BYTES(src_prop->selection);
    }

    *num_targets = _DndIndexToTargets(dpy, src_prop->target_index, targets);

    XFree((char*)src_prop);
}


/* Position the _MOTIF_DRAG_RECEIVER_INFO property on the dropsite window.
   Called by the receiver of the drop to indicate the
   supported protocol style : dynamic, drop_only or none */
static void DndWriteReceiverProperty(Display * dpy, Window window,
                                     unsigned char protocol_style)
{
    DndReceiverProp receiver_prop ;

    receiver_prop.byte_order = DndByteOrder() ;
    receiver_prop.protocol_version = DND_PROTOCOL_VERSION;
    receiver_prop.protocol_style = protocol_style ;
    receiver_prop.proxy_window =  XNone ;
    receiver_prop.num_drop_sites = 0 ;
    receiver_prop.total_size = sizeof(DndReceiverProp);

    /* write the buffer to the property */
    XChangeProperty (dpy, window, ATOM(_MOTIF_DRAG_RECEIVER_INFO), ATOM(_MOTIF_DRAG_RECEIVER_INFO),
                     8, PropModeReplace,
                     (unsigned char *)&receiver_prop,
                     sizeof(DndReceiverProp));
}


/* protocol style equiv (preregister stuff really) */
#define DND_DRAG_DROP_ONLY_EQUIV 3
#define DND_DRAG_DYNAMIC_EQUIV1  2
#define DND_DRAG_DYNAMIC_EQUIV2  4


/* Produce a client message to be sent by the caller */
static void DndFillClientMessage(Display * dpy, Window window,
                                 XClientMessageEvent *cm,
                                 DndData * dnd_data,
                                 char receiver)
{
    DndMessage * dnd_message = (DndMessage*)&cm->data.b[0] ;

    cm->display = dpy;
    cm->type = ClientMessage;
    cm->serial = LastKnownRequestProcessed(dpy);
    cm->send_event = True;
    cm->window = window;
    cm->format = 8;
    cm->message_type = ATOM(_MOTIF_DRAG_AND_DROP_MESSAGE);

    dnd_message->reason = dnd_data->reason | DND_SET_EVENT_TYPE(receiver);

    dnd_message->byte_order = DndByteOrder();

    /* we're filling in flags with more stuff that necessary,
       depending on the reason, but it doesn't matter */
    dnd_message->flags = 0 ;
    dnd_message->flags |= DND_SET_STATUS(dnd_data->status) ;
    dnd_message->flags |= DND_SET_OPERATION(dnd_data->operation) ;
    dnd_message->flags |= DND_SET_OPERATIONS(dnd_data->operations) ;
    dnd_message->flags |= DND_SET_COMPLETION(dnd_data->completion) ;

    dnd_message->time = dnd_data->time ;

    switch(dnd_data->reason) {
    case DND_DROP_SITE_LEAVE: break ;
    case DND_TOP_LEVEL_ENTER:
    case DND_TOP_LEVEL_LEAVE:
        dnd_message->data.top.src_window = dnd_data->src_window ;
        dnd_message->data.top.property = dnd_data->property ;
        break ; /* cannot fall through since the byte layout is different in
                   both set of messages, see top and pot union stuff */

    case DND_DRAG_MOTION:
    case DND_OPERATION_CHANGED:
    case DND_DROP_SITE_ENTER:
    case DND_DROP_START:
        dnd_message->data.pot.x = dnd_data->x ; /* mouse position */
        dnd_message->data.pot.y = dnd_data->y ;
        dnd_message->data.pot.src_window = dnd_data->src_window ;
        dnd_message->data.pot.property = dnd_data->property ;
        break ;
    default:
        break ;
    }

}

static Bool DndParseClientMessage(XClientMessageEvent *cm, DndData * dnd_data,
                                  char * receiver)
{
    DndMessage * dnd_message = (DndMessage*)&cm->data.b[0] ;

    if (cm->message_type != ATOM(_MOTIF_DRAG_AND_DROP_MESSAGE)) {
        return False ;
    }

    if (dnd_message->byte_order != DndByteOrder()) {
        SWAP2BYTES(dnd_message->flags);
        SWAP4BYTES(dnd_message->time);
    } /* do the rest in the switch */

    dnd_data->reason = dnd_message->reason  ;
    if (DND_GET_EVENT_TYPE(dnd_data->reason))
        *receiver = 1 ;
    else
        *receiver = 0 ;
    dnd_data->reason &= DND_CLEAR_EVENT_TYPE ;

    dnd_data->time = dnd_message->time ;

    /* we're reading in more stuff that necessary. but who cares */
    dnd_data->status = DND_GET_STATUS(dnd_message->flags) ;
    dnd_data->operation = DND_GET_OPERATION(dnd_message->flags) ;
    dnd_data->operations = DND_GET_OPERATIONS(dnd_message->flags) ;
    dnd_data->completion = DND_GET_COMPLETION(dnd_message->flags) ;

    switch(dnd_data->reason) {
    case DND_TOP_LEVEL_ENTER:
    case DND_TOP_LEVEL_LEAVE:
        if (dnd_message->byte_order != DndByteOrder()) {
            SWAP4BYTES(dnd_message->data.top.src_window);
            SWAP4BYTES(dnd_message->data.top.property);
        }
        dnd_data->src_window = dnd_message->data.top.src_window ;
        dnd_data->property = dnd_message->data.top.property ;
        break ; /* cannot fall through, see above comment in write msg */

    case DND_DRAG_MOTION:
    case DND_OPERATION_CHANGED:
    case DND_DROP_SITE_ENTER:
    case DND_DROP_START:
        if (dnd_message->byte_order != DndByteOrder()) {
            SWAP2BYTES(dnd_message->data.pot.x);
            SWAP2BYTES(dnd_message->data.pot.y);
            SWAP4BYTES(dnd_message->data.pot.property);
            SWAP4BYTES(dnd_message->data.pot.src_window);
        }
        dnd_data->x = dnd_message->data.pot.x ;
        dnd_data->y = dnd_message->data.pot.y ;
        dnd_data->property = dnd_message->data.pot.property ;
        dnd_data->src_window = dnd_message->data.pot.src_window ;
        break ;

    case DND_DROP_SITE_LEAVE:
        break;
    default:
        break ;
    }

    return True ;
}


static Window MotifWindow(Display *display)
{
    Atom            type;
    int             format;
    unsigned long   size;
    unsigned long   bytes_after;
    unsigned char  *property = 0;
    Window            motif_window ;

    /* this version does no caching, so it's slow: round trip each time */

    if ((XGetWindowProperty (display, RootWindow(display, 0),
                             ATOM(_MOTIF_DRAG_WINDOW),
                             0L, 100000L, False, AnyPropertyType,
                             &type, &format, &size, &bytes_after,
                             &property) == Success) &&
        (type != XNone)) {
        motif_window = *(Window *)property;
    } else {
        XSetWindowAttributes sAttributes;

        /* really, this should be done on a separate connection,
           with XSetCloseDownMode (RetainPermanent), so that
           others don't have to recreate it; hopefully, some real
           Motif application will be around to do it */

        sAttributes.override_redirect = True;
        sAttributes.event_mask = PropertyChangeMask;
        motif_window = XCreateWindow (display,
                                      RootWindow (display, 0),
                                      -170, -560, 1, 1, 0, 0,
                                      InputOnly, CopyFromParent,
                                      (CWOverrideRedirect |CWEventMask),
                                      &sAttributes);
        XMapWindow (display, motif_window);
    }

    if (property) {
        XFree ((char *)property);
    }

    return (motif_window);
}


static DndTargetsTable TargetsTable(Display *display)
{
    Atom            type;
    int             format;
    unsigned long   size;
    unsigned long   bytes_after;
    Window motif_window = MotifWindow(display) ;
    unsigned char  *retval;
    DndTargetsTable targets_table ;
    int i,j ;
    char * target_data ;

    /* this version does no caching, so it's slow: round trip each time */
    /* ideally, register for property notify on this target_list
       atom and update when necessary only */

    if ((XGetWindowProperty (display, motif_window,
                             ATOM(_MOTIF_DRAG_TARGETS), 0L, 100000L,
                             False, ATOM(_MOTIF_DRAG_TARGETS),
                             &type, &format, &size, &bytes_after,
                             &retval) != Success) ||
        type == XNone) {
        qWarning("QMotifDND: Cannot get property on Motif window");
        return 0;
    }

    DndTargets * target_prop = (DndTargets *)retval;

    if (target_prop->protocol_version != DND_PROTOCOL_VERSION) {
        qWarning("QMotifDND: Protocol mismatch");
    }

    if (target_prop->byte_order != DndByteOrder()) {
        /* need to swap num_target_lists and size */
        SWAP2BYTES(target_prop->num_target_lists);
        SWAP4BYTES(target_prop->data_size);
    }

    /* now parse DndTarget prop data in a TargetsTable */

    targets_table = (DndTargetsTable)malloc(sizeof(DndTargetsTableRec));
    targets_table->num_entries = target_prop->num_target_lists ;
    targets_table->entries = (DndTargetsTableEntry)
                             malloc(sizeof(DndTargetsTableEntryRec) * target_prop->num_target_lists);

    target_data = (char*)target_prop + sizeof(*target_prop) ;

    for (i = 0 ; i < targets_table->num_entries; i++) {
        CARD16 num_targets ;
        CARD32 atom ;

        memcpy(&num_targets, target_data, 2);
        target_data += 2;

        /* potential swap needed here */
        if (target_prop->byte_order != DndByteOrder())
            SWAP2BYTES(num_targets);

        targets_table->entries[i].num_targets = num_targets ;
        targets_table->entries[i].targets = (Atom *)
                                            malloc(sizeof(Atom) * targets_table->entries[i].num_targets);


        for (j = 0; j < num_targets; j++) {
            memcpy(&atom, target_data, 4);
            target_data += 4;

            /* another potential swap needed here */
            if (target_prop->byte_order != DndByteOrder())
                SWAP4BYTES(atom);

            targets_table->entries[i].targets[j] = (Atom) atom ;
        }
    }

    if (target_prop) {
        XFree((char *)target_prop);
    }

    return targets_table ;
}


static ushort _DndIndexToTargets(Display * display,
                              int index,
                              Atom ** targets)
{
    DndTargetsTable        targets_table;
    int i ;

    /* again, slow: no caching here, alloc/free each time */

    if (!(targets_table = TargetsTable (display)) ||
        (index >= targets_table->num_entries)) {
        if (targets_table)
            XFree((char*)targets_table);
        return 0;
    }

    /* transfer the correct target list index */
    *targets = (Atom*)malloc(sizeof(Atom)*targets_table->
                             entries[index].num_targets);
    memcpy((char*)*targets,
           (char*)targets_table->entries[index].targets,
           sizeof(Atom)*targets_table->entries[index].num_targets);

    /* free the target table and its guts */
    for (i=0 ; i < targets_table->num_entries; i++)
        XFree((char*)targets_table->entries[i].targets);

    int tmp = targets_table->entries[index].num_targets;
    XFree((char*)targets_table);

    return tmp; // targets_table->entries[index].num_targets;
}


QByteArray QX11Data::motifdndFormat(int n)
{
    if (!motifdnd_active)
        return 0; // should not happen

    if (n >= num_src_targets)
        return 0;

    Atom target = src_targets[n];

    if (target == XA_STRING)
        return "text/plain;charset=ISO-8859-1";
    if (target == ATOM(UTF8_STRING))
        return "text/plain;charset=UTF-8";
    if (target == ATOM(COMPOUND_TEXT))
        return QByteArray("text/plain;charset=") + QTextCodec::codecForLocale()->name();
    if (target == ATOM(TEXT))
        return "text/plain";

    return ("x-motif-dnd/" + X11->xdndAtomToString(target));
}


QVariant QX11Data::motifdndObtainData(const char *mimeType)
{
    QByteArray result;

    if (Dnd_selection == 0 || !dropWidget)
        return result;

    // try to convert the selection to the requested property
    // qDebug("trying to convert to '%s'", mimeType);

    int n=0;
    QByteArray f;
    do {
        f = motifdndFormat(n);
        if (f.isEmpty())
            return result;
        n++;
    } while(qstricmp(mimeType, f.data()));

    Atom conversion_type = XNone;
    if (f == "text/plain;charset=ISO-8859-1") {
        conversion_type = XA_STRING;
    } else if (f == "text/plain;charset=UTF-8") {
        conversion_type = ATOM(UTF8_STRING);
    } else if (f == (QByteArray("text/plain;charset=") + QTextCodec::codecForLocale()->name())) {
        conversion_type = ATOM(COMPOUND_TEXT);
    } else if (f == "text/plain") {
        conversion_type = ATOM(TEXT);
    } else if (f.startsWith("x-motif-dnd/")) {
        // strip off the "x-motif-dnd/" prefix
        conversion_type = X11->xdndStringToAtom(f.remove(0, 12));
    }

    if (XGetSelectionOwner(X11->display, Dnd_selection) == XNone) {
        return result; // should never happen?
    }

    QWidget* tw = dropWidget;
    if ((dropWidget->windowType() == Qt::Desktop)) {
        tw = new QWidget;
    }

    // convert selection to the appropriate type
    XConvertSelection (X11->display, Dnd_selection, conversion_type,
                       Dnd_selection, tw->internalWinId(), Dnd_selection_time);

    XFlush(X11->display);

    XEvent xevent;
    bool got=X11->clipboardWaitForEvent(tw->internalWinId(), SelectionNotify, &xevent, 5000);
    if (got) {
        Atom type;

        if (X11->clipboardReadProperty(tw->internalWinId(), Dnd_selection, true, &result, 0, &type, 0, false)) {
        }
    }

    //   we have to convert selection in order to indicate success to the initiator
    XConvertSelection (X11->display, Dnd_selection, ATOM(XmTRANSFER_SUCCESS),
                       Dnd_selection, tw->internalWinId(), Dnd_selection_time);

    // wait again for SelectionNotify event
    X11->clipboardWaitForEvent(tw->internalWinId(), SelectionNotify, &xevent, 5000);

    if ((dropWidget->windowType() == Qt::Desktop)) {
        delete tw;
    }

    return result;
}


void QX11Data::motifdndEnable(QWidget *widget, bool)
{
    DndWriteReceiverProperty(display, widget->internalWinId(), DND_DRAG_DYNAMIC);
}


void QX11Data::motifdndHandle(QWidget *widget, const XEvent * xe, bool /* passive */)
{
    XEvent event = *xe;
    XClientMessageEvent cm ;
    DndData dnd_data ;
    char receiver ;

    if (!(DndParseClientMessage ((XClientMessageEvent*)&event,
                                 &dnd_data, &receiver))) {
        return;
    }

    switch (dnd_data.reason) {

    case DND_DRAG_MOTION:
        {
            QPoint p = widget->mapFromGlobal(QPoint(dnd_data.x, dnd_data.y));
            QWidget *c = widget->childAt(p);

            if (!c || !c->acceptDrops()) {
                // not over a drop site
                if (dropWidget) {
                    QDragLeaveEvent dragLeaveEvent;
                    QApplication::sendEvent(dropWidget, &dragLeaveEvent);

                    dropWidget = 0;
                    lastAcceptedAction = Qt::IgnoreAction;

                    dnd_data.reason = DND_DROP_SITE_LEAVE;
                    dnd_data.time = X11->time;
                    DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, receiver);
                    XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm) ;
                } else {
                    dnd_data.reason = DND_DRAG_MOTION;
                    dnd_data.status = DND_NO_DROP_SITE;
                    dnd_data.time = X11->time;
                    dnd_data.operation = DND_NOOP;
                    dnd_data.operations = DND_NOOP;
                    DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, receiver);
                    XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm) ;
                }
            } else {
                Q_ASSERT(c != 0);
                p = c->mapFrom(widget, p);

                if (dropWidget != c) {
                    if (dropWidget) {
                        QDragLeaveEvent le;
                        QApplication::sendEvent(dropWidget, &le);
                    }

                    dropWidget = c;
                    lastAcceptedAction = Qt::IgnoreAction;

                    const Qt::DropActions possibleActions =
                        DndOperationsToQtDropActions(dnd_data.operations);
                    QDragEnterEvent de(p, possibleActions, QDragManager::self()->dropData,
                                       QApplication::mouseButtons(), QApplication::keyboardModifiers());
                    QApplication::sendEvent(dropWidget, &de);

                    dnd_data.reason = DND_DROP_SITE_ENTER;
                    dnd_data.time = X11->time;
                    if (de.isAccepted()) {
                        lastAcceptedAction = de.dropAction();

                        dnd_data.status = DND_VALID_DROP_SITE;
                        dnd_data.operation = QtDropActionToDndOperation(lastAcceptedAction);
                    } else {
                        dnd_data.status = DND_INVALID_DROP_SITE;
                        dnd_data.operation = DND_NOOP;
                        dnd_data.operations = DND_NOOP;
                    }
                    DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, receiver);
                    XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm);
                } else {
                    const Qt::DropActions possibleActions =
                        DndOperationsToQtDropActions(dnd_data.operations);
                    QDragMoveEvent me(p, possibleActions, QDragManager::self()->dropData,
                                      QApplication::mouseButtons(), QApplication::keyboardModifiers());
                    if (lastAcceptedAction != Qt::IgnoreAction) {
                        me.setDropAction(lastAcceptedAction);
                        me.accept();
                    }
                    QApplication::sendEvent(dropWidget, &me);

                    dnd_data.reason = DND_DRAG_MOTION;
                    dnd_data.time = X11->time;

                    if (me.isAccepted()) {
                        lastAcceptedAction = me.dropAction();

                        dnd_data.status = DND_VALID_DROP_SITE;
                        dnd_data.operation = QtDropActionToDndOperation(lastAcceptedAction);
                    } else {
                        dnd_data.status = DND_INVALID_DROP_SITE;
                        dnd_data.operation = DND_NOOP;
                        dnd_data.operations = DND_NOOP;
                    }

                    DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, receiver);
                    XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm);
                }
            }

            break;
        }

    case DND_TOP_LEVEL_ENTER:
        {
            /* get the size of our drop site for later use */

            motifdnd_active = true;
            sourceWindow = dnd_data.src_window;

            /* no answer needed, just read source property */
            DndReadSourceProperty (event.xclient.display,
                                   sourceWindow,
                                   dnd_data.property,
                                   &src_targets, &num_src_targets);

            break;
        }

    case DND_TOP_LEVEL_LEAVE:
        {
            XEvent nextEvent;
            if (XCheckTypedWindowEvent(X11->display, widget->winId(), ClientMessage, &nextEvent)) {
                // we just want to check, not eat (should use XPeekIfEvent)
                XPutBackEvent(X11->display, &nextEvent);

                if (DndParseClientMessage (&nextEvent.xclient, &dnd_data, &receiver)
                    && dnd_data.reason == DND_DROP_START) {
                    // expecting drop next, keeping DnD alive
                    break;
                }
            }

            // not expecting drop, need to send drag leave events and such here
            if (dropWidget) {
                QDragLeaveEvent le;
                QApplication::sendEvent(dropWidget, &le);
            }

            sourceWindow = XNone;
            dropWidget = 0;
            lastAcceptedAction = Qt::IgnoreAction;

            motifdnd_active = false;

            break;
        }

    case DND_OPERATION_CHANGED:
        // ### need to echo
        break;

    case DND_DROP_START:
        {
            Q_ASSERT(motifdnd_active);
            Q_ASSERT(sourceWindow == dnd_data.src_window);

            if (!dropWidget || lastAcceptedAction == Qt::IgnoreAction) {
                // echo DROP_START
                dnd_data.reason = DND_DROP_START;
                dnd_data.status = DND_NO_DROP_SITE;
                dnd_data.operation = DND_NOOP;
                dnd_data.operations = DND_NOOP;
                DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, 0);
                XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm);

                // we have to convert selection in order to indicate failure to the initiator
                XConvertSelection (X11->display, dnd_data.property, ATOM(XmTRANSFER_FAILURE),
                                   dnd_data.property, dnd_data.src_window, dnd_data.time);

                if (dropWidget) {
                    QDragLeaveEvent e;
                    QApplication::sendEvent(dropWidget, &e);
                }

                motifdnd_active = false;
                sourceWindow = XNone;
                dropWidget = 0;
                lastAcceptedAction = Qt::IgnoreAction;

                return;
            }

            // store selection and its time
            Dnd_selection = dnd_data.property;
            Dnd_selection_time = dnd_data.time;

            QPoint p(dnd_data.x, dnd_data.y);
            QDropEvent de(dropWidget->mapFromGlobal(p), Qt::CopyAction, QDragManager::self()->dropData,
                          QApplication::mouseButtons(), QApplication::keyboardModifiers());
            if (lastAcceptedAction != Qt::IgnoreAction) {
                de.setDropAction(lastAcceptedAction);
                de.accept();
            }
            QApplication::sendEvent(dropWidget, &de);

            // reset
            Dnd_selection = XNone;
            Dnd_selection_time = 0;

            // echo DROP_START depending on the result of the dropEvent
            if (de.isAccepted()) {
                dnd_data.reason = DND_DROP_START;
                dnd_data.status = DND_VALID_DROP_SITE;
                dnd_data.operation = QtDropActionToDndOperation(de.dropAction());
            } else {
                dnd_data.reason = DND_DROP_START;
                dnd_data.status = DND_NO_DROP_SITE;
                dnd_data.operation = DND_NOOP;
                dnd_data.operations = DND_NOOP;
            }
            DndFillClientMessage (event.xclient.display, sourceWindow, &cm, &dnd_data, 0);
            XSendEvent(event.xbutton.display, sourceWindow, False, 0, (XEvent *)&cm);

            sourceWindow = XNone;
            dropWidget = 0;
            lastAcceptedAction = Qt::IgnoreAction;

            motifdnd_active = false;

            break;
        }

    default:
        break;
    }   //  end of switch (dnd_data.reason)
}

QT_END_NAMESPACE

#endif // QT_NO_DRAGANDDROP