server/window.c

   1 /*
   2  * Server-side window handling
   3  *
   4  * Copyright (C) 2001 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25
  26 #include "winbase.h"
  27 #include "wingdi.h"
  28 #include "winuser.h"
  29
  30 #include "object.h"
  31 #include "request.h"
  32 #include "thread.h"
  33 #include "process.h"
  34 #include "user.h"
  35 #include "unicode.h"
  36
  37 /* a window property */
  38 struct property
  39 {
  40     unsigned short type;     /* property type (see below) */
  41     atom_t         atom;     /* property atom */
  42     obj_handle_t   handle;   /* property handle (user-defined storage) */
  43 };
  44
  45 enum property_type
  46 {
  47     PROP_TYPE_FREE,   /* free entry */
  48     PROP_TYPE_STRING, /* atom that was originally a string */
  49     PROP_TYPE_ATOM    /* plain atom */
  50 };
  51
  52
  53 struct window
  54 {
  55     struct window   *parent;          /* parent window */
  56     struct window   *owner;           /* owner of this window */
  57     struct window   *first_child;     /* first child in Z-order */
  58     struct window   *last_child;      /* last child in Z-order */
  59     struct window   *first_unlinked;  /* first child not linked in the Z-order list */
  60     struct window   *next;            /* next window in Z-order */
  61     struct window   *prev;            /* prev window in Z-order */
  62     user_handle_t    handle;          /* full handle for this window */
  63     struct thread   *thread;          /* thread owning the window */
  64     atom_t           atom;            /* class atom */
  65     rectangle_t      window_rect;     /* window rectangle */
  66     rectangle_t      client_rect;     /* client rectangle */
  67     unsigned int     style;           /* window style */
  68     unsigned int     ex_style;        /* window extended style */
  69     unsigned int     id;              /* window id */
  70     void*            instance;        /* creator instance */
  71     void*            user_data;       /* user-specific data */
  72     WCHAR           *text;            /* window caption text */
  73     int              paint_count;     /* count of pending paints for this window */
  74     int              prop_inuse;      /* number of in-use window properties */
  75     int              prop_alloc;      /* number of allocated window properties */
  76     struct property *properties;      /* window properties array */
  77 };
  78
  79 static struct window *top_window;  /* top-level (desktop) window */
  80
  81
  82 /* retrieve a pointer to a window from its handle */
  83 inline static struct window *get_window( user_handle_t handle )
  84 {
  85     struct window *ret = get_user_object( handle, USER_WINDOW );
  86     if (!ret) set_error( STATUS_INVALID_HANDLE );
  87     return ret;
  88 }
  89
  90 /* unlink a window from the tree */
  91 static void unlink_window( struct window *win )
  92 {
  93     struct window *parent = win->parent;
  94
  95     assert( parent );
  96
  97     if (win->next) win->next->prev = win->prev;
  98     else if (parent->last_child == win) parent->last_child = win->prev;
  99
 100     if (win->prev) win->prev->next = win->next;
 101     else if (parent->first_child == win) parent->first_child = win->next;
 102     else if (parent->first_unlinked == win) parent->first_unlinked = win->next;
 103 }
 104
 105
 106 /* link a window into the tree (or unlink it if the new parent is NULL)  */
 107 static void link_window( struct window *win, struct window *parent, struct window *previous )
 108 {
 109     unlink_window( win );  /* unlink it from the previous location */
 110
 111     if (parent)
 112     {
 113         if (win->parent != parent)
 114         {
 115             win->owner = NULL;  /* reset owner if changing parent */
 116             win->parent = parent;
 117         }
 118         if ((win->prev = previous))
 119         {
 120             if ((win->next = previous->next)) win->next->prev = win;
 121             else if (win->parent->last_child == previous) win->parent->last_child = win;
 122             win->prev->next = win;
 123         }
 124         else
 125         {
 126             if ((win->next = parent->first_child)) win->next->prev = win;
 127             else win->parent->last_child = win;
 128             parent->first_child = win;
 129         }
 130     }
 131     else  /* move it to parent unlinked list */
 132     {
 133         parent = win->parent;
 134         if ((win->next = parent->first_unlinked)) win->next->prev = win;
 135         win->prev = NULL;
 136         parent->first_unlinked = win;
 137     }
 138 }
 139
 140 /* set a window property */
 141 static void set_property( struct window *win, atom_t atom, obj_handle_t handle,
 142                           enum property_type type )
 143 {
 144     int i, free = -1;
 145     struct property *new_props;
 146
 147     /* check if it exists already */
 148     for (i = 0; i < win->prop_inuse; i++)
 149     {
 150         if (win->properties[i].type == PROP_TYPE_FREE)
 151         {
 152             free = i;
 153             continue;
 154         }
 155         if (win->properties[i].atom == atom)
 156         {
 157             win->properties[i].type = type;
 158             win->properties[i].handle = handle;
 159             return;
 160         }
 161     }
 162
 163     /* need to add an entry */
 164     if (!grab_global_atom( atom )) return;
 165     if (free == -1)
 166     {
 167         /* no free entry */
 168         if (win->prop_inuse >= win->prop_alloc)
 169         {
 170             /* need to grow the array */
 171             if (!(new_props = realloc( win->properties,
 172                                        sizeof(*new_props) * (win->prop_alloc + 16) )))
 173             {
 174                 set_error( STATUS_NO_MEMORY );
 175                 release_global_atom( atom );
 176                 return;
 177             }
 178             win->prop_alloc += 16;
 179             win->properties = new_props;
 180         }
 181         free = win->prop_inuse++;
 182     }
 183     win->properties[free].atom   = atom;
 184     win->properties[free].type   = type;
 185     win->properties[free].handle = handle;
 186 }
 187
 188 /* remove a window property */
 189 static obj_handle_t remove_property( struct window *win, atom_t atom )
 190 {
 191     int i;
 192
 193     for (i = 0; i < win->prop_inuse; i++)
 194     {
 195         if (win->properties[i].type == PROP_TYPE_FREE) continue;
 196         if (win->properties[i].atom == atom)
 197         {
 198             release_global_atom( atom );
 199             win->properties[i].type = PROP_TYPE_FREE;
 200             return win->properties[i].handle;
 201         }
 202     }
 203     /* FIXME: last error? */
 204     return 0;
 205 }
 206
 207 /* find a window property */
 208 static obj_handle_t get_property( struct window *win, atom_t atom )
 209 {
 210     int i;
 211
 212     for (i = 0; i < win->prop_inuse; i++)
 213     {
 214         if (win->properties[i].type == PROP_TYPE_FREE) continue;
 215         if (win->properties[i].atom == atom) return win->properties[i].handle;
 216     }
 217     /* FIXME: last error? */
 218     return 0;
 219 }
 220
 221 /* destroy all properties of a window */
 222 inline static void destroy_properties( struct window *win )
 223 {
 224     int i;
 225
 226     if (!win->properties) return;
 227     for (i = 0; i < win->prop_inuse; i++)
 228     {
 229         if (win->properties[i].type == PROP_TYPE_FREE) continue;
 230         release_global_atom( win->properties[i].atom );
 231     }
 232     free( win->properties );
 233 }
 234
 235 /* destroy a window */
 236 static void destroy_window( struct window *win )
 237 {
 238     assert( win != top_window );
 239
 240     /* destroy all children */
 241     while (win->first_child) destroy_window( win->first_child );
 242     while (win->first_unlinked) destroy_window( win->first_unlinked );
 243
 244     /* reset siblings owner */
 245     if (win->parent)
 246     {
 247         struct window *ptr;
 248         for (ptr = win->parent->first_child; ptr; ptr = ptr->next)
 249             if (ptr->owner == win) ptr->owner = NULL;
 250         for (ptr = win->parent->first_unlinked; ptr; ptr = ptr->next)
 251             if (ptr->owner == win) ptr->owner = NULL;
 252     }
 253
 254     if (win->thread->queue)
 255     {
 256         if (win->paint_count) inc_queue_paint_count( win->thread, -win->paint_count );
 257         queue_cleanup_window( win->thread, win->handle );
 258     }
 259     free_user_handle( win->handle );
 260     destroy_properties( win );
 261     unlink_window( win );
 262     if (win->text) free( win->text );
 263     memset( win, 0x55, sizeof(*win) );
 264     free( win );
 265 }
 266
 267 /* create a new window structure (note: the window is not linked in the window tree) */
 268 static struct window *create_window( struct window *parent, struct window *owner, atom_t atom )
 269 {
 270     struct window *win = mem_alloc( sizeof(*win) );
 271     if (!win) return NULL;
 272
 273     if (!(win->handle = alloc_user_handle( win, USER_WINDOW )))
 274     {
 275         free( win );
 276         return NULL;
 277     }
 278     win->parent         = parent;
 279     win->owner          = owner;
 280     win->first_child    = NULL;
 281     win->last_child     = NULL;
 282     win->first_unlinked = NULL;
 283     win->thread         = current;
 284     win->atom           = atom;
 285     win->style          = 0;
 286     win->ex_style       = 0;
 287     win->id             = 0;
 288     win->instance       = NULL;
 289     win->user_data      = NULL;
 290     win->text           = NULL;
 291     win->paint_count    = 0;
 292     win->prop_inuse     = 0;
 293     win->prop_alloc     = 0;
 294     win->properties     = NULL;
 295
 296     if (parent)  /* put it on parent unlinked list */
 297     {
 298         if ((win->next = parent->first_unlinked)) win->next->prev = win;
 299         win->prev = NULL;
 300         parent->first_unlinked = win;
 301     }
 302     else win->next = win->prev = NULL;
 303
 304     return win;
 305 }
 306
 307 /* destroy all windows belonging to a given thread */
 308 void destroy_thread_windows( struct thread *thread )
 309 {
 310     user_handle_t handle = 0;
 311     struct window *win;
 312
 313     while ((win = next_user_handle( &handle, USER_WINDOW )))
 314     {
 315         if (win->thread != thread) continue;
 316         destroy_window( win );
 317     }
 318 }
 319
 320 /* check whether child is a descendant of parent */
 321 int is_child_window( user_handle_t parent, user_handle_t child )
 322 {
 323     struct window *child_ptr = get_user_object( child, USER_WINDOW );
 324     struct window *parent_ptr = get_user_object( parent, USER_WINDOW );
 325
 326     if (!child_ptr || !parent_ptr) return 0;
 327     while (child_ptr->parent)
 328     {
 329         if (child_ptr->parent == parent_ptr) return 1;
 330         child_ptr = child_ptr->parent;
 331     }
 332     return 0;
 333 }
 334
 335 /* return the thread owning a window */
 336 struct thread *get_window_thread( user_handle_t handle )
 337 {
 338     struct window *win = get_user_object( handle, USER_WINDOW );
 339     if (!win || !win->thread) return NULL;
 340     return (struct thread *)grab_object( win->thread );
 341 }
 342
 343 /* find a child of the specified window that needs repainting */
 344 static struct window *find_child_to_repaint( struct window *parent, struct thread *thread )
 345 {
 346     struct window *ptr, *ret = NULL;
 347
 348     for (ptr = parent->first_child; ptr && !ret; ptr = ptr->next)
 349     {
 350         if (!(ptr->style & WS_VISIBLE)) continue;
 351         if (ptr->paint_count && ptr->thread == thread)
 352             ret = ptr;
 353         else /* explore its children */
 354             ret = find_child_to_repaint( ptr, thread );
 355     }
 356
 357     if (ret && (ret->ex_style & WS_EX_TRANSPARENT))
 358     {
 359         /* transparent window, check for non-transparent sibling to paint first */
 360         for (ptr = ret->next; ptr; ptr = ptr->next)
 361         {
 362             if (!(ptr->style & WS_VISIBLE)) continue;
 363             if (ptr->ex_style & WS_EX_TRANSPARENT) continue;
 364             if (ptr->paint_count && ptr->thread == thread) return ptr;
 365         }
 366     }
 367     return ret;
 368 }
 369
 370
 371 /* find a window that needs repainting */
 372 user_handle_t find_window_to_repaint( user_handle_t parent, struct thread *thread )
 373 {
 374     struct window *win = parent ? get_window( parent ) : top_window;
 375
 376     if (!win || !(win->style & WS_VISIBLE)) return 0;
 377     if (!win->paint_count || win->thread != thread)
 378         win = find_child_to_repaint( win, thread );
 379     return win ? win->handle : 0;
 380 }
 381
 382
 383 /* create a window */
 384 DECL_HANDLER(create_window)
 385 {
 386     reply->handle = 0;
 387     if (!req->parent)  /* return desktop window */
 388     {
 389         if (!top_window)
 390         {
 391             if (!(top_window = create_window( NULL, NULL, req->atom ))) return;
 392             top_window->thread = NULL;  /* no thread owns the desktop */
 393         }
 394         reply->handle = top_window->handle;
 395     }
 396     else
 397     {
 398         struct window *win, *parent, *owner = NULL;
 399
 400         if (!(parent = get_window( req->parent ))) return;
 401         if (req->owner && !(owner = get_window( req->owner ))) return;
 402         if (owner == top_window) owner = NULL;
 403         else if (owner && owner->parent != parent)
 404         {
 405             /* owner must be a sibling of the new window */
 406             set_error( STATUS_ACCESS_DENIED );
 407             return;
 408         }
 409         if (!(win = create_window( parent, owner, req->atom ))) return;
 410         reply->handle = win->handle;
 411     }
 412 }
 413
 414
 415 /* link a window into the tree */
 416 DECL_HANDLER(link_window)
 417 {
 418     struct window *win, *parent = NULL, *previous = NULL;
 419
 420     if (!(win = get_window( req->handle ))) return;
 421     if (req->parent && !(parent = get_window( req->parent ))) return;
 422
 423     if (win == top_window)
 424     {
 425         set_error( STATUS_INVALID_PARAMETER );
 426         return;
 427     }
 428     reply->full_parent = parent ? parent->handle : 0;
 429     if (parent && req->previous)
 430     {
 431         if (req->previous == (user_handle_t)1)  /* special case: HWND_BOTTOM */
 432         {
 433             previous = parent->last_child;
 434             if (previous == win) return;  /* nothing to do */
 435         }
 436         else
 437         {
 438             if (!(previous = get_window( req->previous ))) return;
 439             /* previous must be a child of parent, and not win itself */
 440             if (previous->parent != parent || previous == win)
 441             {
 442                 set_error( STATUS_INVALID_PARAMETER );
 443                 return;
 444             }
 445         }
 446     }
 447     link_window( win, parent, previous );
 448 }
 449
 450
 451 /* destroy a window */
 452 DECL_HANDLER(destroy_window)
 453 {
 454     struct window *win = get_window( req->handle );
 455     if (win)
 456     {
 457         if (win != top_window) destroy_window( win );
 458         else set_error( STATUS_ACCESS_DENIED );
 459     }
 460 }
 461
 462
 463 /* set a window owner */
 464 DECL_HANDLER(set_window_owner)
 465 {
 466     struct window *win = get_window( req->handle );
 467     struct window *owner = get_window( req->owner );
 468
 469     if (!win || !owner) return;
 470     if (owner->parent != win->parent)
 471     {
 472         /* owner has to be a sibling of window */
 473         set_error( STATUS_ACCESS_DENIED );
 474         return;
 475     }
 476     win->owner = owner;
 477     reply->full_owner = owner->handle;
 478 }
 479
 480
 481 /* get information from a window handle */
 482 DECL_HANDLER(get_window_info)
 483 {
 484     struct window *win = get_window( req->handle );
 485
 486     reply->full_handle = 0;
 487     reply->tid = reply->pid = 0;
 488     if (win)
 489     {
 490         reply->full_handle = win->handle;
 491         if (win->thread)
 492         {
 493             reply->tid  = get_thread_id( win->thread );
 494             reply->pid  = get_process_id( win->thread->process );
 495             reply->atom = win->atom;
 496         }
 497     }
 498 }
 499
 500
 501 /* set some information in a window */
 502 DECL_HANDLER(set_window_info)
 503 {
 504     struct window *win = get_window( req->handle );
 505     if (!win) return;
 506     reply->old_style     = win->style;
 507     reply->old_ex_style  = win->ex_style;
 508     reply->old_id        = win->id;
 509     reply->old_instance  = win->instance;
 510     reply->old_user_data = win->user_data;
 511     if (req->flags & SET_WIN_STYLE) win->style = req->style;
 512     if (req->flags & SET_WIN_EXSTYLE) win->ex_style = req->ex_style;
 513     if (req->flags & SET_WIN_ID) win->id = req->id;
 514     if (req->flags & SET_WIN_INSTANCE) win->instance = req->instance;
 515     if (req->flags & SET_WIN_USERDATA) win->user_data = req->user_data;
 516 }
 517
 518
 519 /* get a list of the window parents, up to the root of the tree */
 520 DECL_HANDLER(get_window_parents)
 521 {
 522     struct window *ptr, *win = get_window( req->handle );
 523     int total = 0;
 524     user_handle_t *data;
 525     size_t len;
 526
 527     if (win) for (ptr = win->parent; ptr; ptr = ptr->parent) total++;
 528
 529     reply->count = total;
 530     len = min( get_reply_max_size(), total * sizeof(user_handle_t) );
 531     if (len && ((data = set_reply_data_size( len ))))
 532     {
 533         for (ptr = win->parent; ptr && len; ptr = ptr->parent, len -= sizeof(*data))
 534             *data++ = ptr->handle;
 535     }
 536 }
 537
 538
 539 /* get a list of the window children */
 540 DECL_HANDLER(get_window_children)
 541 {
 542     struct window *ptr, *parent = get_window( req->parent );
 543     int total = 0;
 544     user_handle_t *data;
 545     size_t len;
 546
 547     if (parent)
 548         for (ptr = parent->first_child, total = 0; ptr; ptr = ptr->next)
 549         {
 550             if (req->atom && ptr->atom != req->atom) continue;
 551             if (req->tid && get_thread_id(ptr->thread) != req->tid) continue;
 552             total++;
 553         }
 554
 555     reply->count = total;
 556     len = min( get_reply_max_size(), total * sizeof(user_handle_t) );
 557     if (len && ((data = set_reply_data_size( len ))))
 558     {
 559         for (ptr = parent->first_child; ptr && len; ptr = ptr->next)
 560         {
 561             if (req->atom && ptr->atom != req->atom) continue;
 562             if (req->tid && get_thread_id(ptr->thread) != req->tid) continue;
 563             *data++ = ptr->handle;
 564             len -= sizeof(*data);
 565         }
 566     }
 567 }
 568
 569
 570 /* get window tree information from a window handle */
 571 DECL_HANDLER(get_window_tree)
 572 {
 573     struct window *win = get_window( req->handle );
 574
 575     if (!win) return;
 576
 577     if (win->parent)
 578     {
 579         struct window *parent = win->parent;
 580         reply->parent        = parent->handle;
 581         reply->owner         = win->owner ? win->owner->handle : 0;
 582         reply->next_sibling  = win->next ? win->next->handle : 0;
 583         reply->prev_sibling  = win->prev ? win->prev->handle : 0;
 584         reply->first_sibling = parent->first_child ? parent->first_child->handle : 0;
 585         reply->last_sibling  = parent->last_child ? parent->last_child->handle : 0;
 586     }
 587     else
 588     {
 589         reply->parent        = 0;
 590         reply->owner         = 0;
 591         reply->next_sibling  = 0;
 592         reply->prev_sibling  = 0;
 593         reply->first_sibling = 0;
 594         reply->last_sibling  = 0;
 595     }
 596     reply->first_child = win->first_child ? win->first_child->handle : 0;
 597     reply->last_child  = win->last_child ? win->last_child->handle : 0;
 598 }
 599
 600
 601 /* set the window and client rectangles of a window */
 602 DECL_HANDLER(set_window_rectangles)
 603 {
 604     struct window *win = get_window( req->handle );
 605
 606     if (win)
 607     {
 608         win->window_rect = req->window;
 609         win->client_rect = req->client;
 610     }
 611 }
 612
 613
 614 /* get the window and client rectangles of a window */
 615 DECL_HANDLER(get_window_rectangles)
 616 {
 617     struct window *win = get_window( req->handle );
 618
 619     if (win)
 620     {
 621         reply->window = win->window_rect;
 622         reply->client = win->client_rect;
 623     }
 624 }
 625
 626
 627 /* get the window text */
 628 DECL_HANDLER(get_window_text)
 629 {
 630     struct window *win = get_window( req->handle );
 631
 632     if (win && win->text)
 633     {
 634         size_t len = strlenW( win->text ) * sizeof(WCHAR);
 635         if (len > get_reply_max_size()) len = get_reply_max_size();
 636         set_reply_data( win->text, len );
 637     }
 638 }
 639
 640
 641 /* set the window text */
 642 DECL_HANDLER(set_window_text)
 643 {
 644     struct window *win = get_window( req->handle );
 645
 646     if (win)
 647     {
 648         WCHAR *text = NULL;
 649         size_t len = get_req_data_size() / sizeof(WCHAR);
 650         if (len)
 651         {
 652             if (!(text = mem_alloc( (len+1) * sizeof(WCHAR) ))) return;
 653             memcpy( text, get_req_data(), len * sizeof(WCHAR) );
 654             text[len] = 0;
 655         }
 656         if (win->text) free( win->text );
 657         win->text = text;
 658     }
 659 }
 660
 661
 662 /* increment the window paint count */
 663 DECL_HANDLER(inc_window_paint_count)
 664 {
 665     struct window *win = get_window( req->handle );
 666
 667     if (win && win->thread)
 668     {
 669         int old = win->paint_count;
 670         if ((win->paint_count += req->incr) < 0) win->paint_count = 0;
 671         inc_queue_paint_count( win->thread, win->paint_count - old );
 672     }
 673 }
 674
 675
 676 /* get the coordinates offset between two windows */
 677 DECL_HANDLER(get_windows_offset)
 678 {
 679     struct window *win;
 680
 681     reply->x = reply->y = 0;
 682     if (req->from)
 683     {
 684         if (!(win = get_window( req->from ))) return;
 685         while (win)
 686         {
 687             reply->x += win->client_rect.left;
 688             reply->y += win->client_rect.top;
 689             win = win->parent;
 690         }
 691     }
 692     if (req->to)
 693     {
 694         if (!(win = get_window( req->to ))) return;
 695         while (win)
 696         {
 697             reply->x -= win->client_rect.left;
 698             reply->y -= win->client_rect.top;
 699             win = win->parent;
 700         }
 701     }
 702 }
 703
 704
 705 /* set a window property */
 706 DECL_HANDLER(set_window_property)
 707 {
 708     struct window *win = get_window( req->window );
 709
 710     if (win) set_property( win, req->atom, req->handle,
 711                            req->string ? PROP_TYPE_STRING : PROP_TYPE_ATOM );
 712 }
 713
 714
 715 /* remove a window property */
 716 DECL_HANDLER(remove_window_property)
 717 {
 718     struct window *win = get_window( req->window );
 719     reply->handle = 0;
 720     if (win) reply->handle = remove_property( win, req->atom );
 721 }
 722
 723
 724 /* get a window property */
 725 DECL_HANDLER(get_window_property)
 726 {
 727     struct window *win = get_window( req->window );
 728     reply->handle = 0;
 729     if (win) reply->handle = get_property( win, req->atom );
 730 }
 731
 732
 733 /* get the list of properties of a window */
 734 DECL_HANDLER(get_window_properties)
 735 {
 736     property_data_t *data;
 737     int i, count, max = get_reply_max_size() / sizeof(*data);
 738     struct window *win = get_window( req->window );
 739
 740     reply->total = 0;
 741     if (!win) return;
 742
 743     for (i = count = 0; i < win->prop_inuse; i++)
 744         if (win->properties[i].type != PROP_TYPE_FREE) count++;
 745     reply->total = count;
 746
 747     if (count > max) count = max;
 748     if (!count || !(data = set_reply_data_size( count * sizeof(*data) ))) return;
 749
 750     for (i = 0; i < win->prop_inuse && count; i++)
 751     {
 752         if (win->properties[i].type == PROP_TYPE_FREE) continue;
 753         data->atom   = win->properties[i].atom;
 754         data->string = (win->properties[i].type == PROP_TYPE_STRING);
 755         data->handle = win->properties[i].handle;
 756         data++;
 757         count--;
 758     }
 759 }