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     user_handle_t    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     user_handle_t    last_active;     /* last active popup */
  66     rectangle_t      window_rect;     /* window rectangle */
  67     rectangle_t      client_rect;     /* client rectangle */
  68     unsigned int     style;           /* window style */
  69     unsigned int     ex_style;        /* window extended style */
  70     unsigned int     id;              /* window id */
  71     void*            instance;        /* creator instance */
  72     void*            user_data;       /* user-specific data */
  73     WCHAR           *text;            /* window caption text */
  74     int              paint_count;     /* count of pending paints for this window */
  75     int              prop_inuse;      /* number of in-use window properties */
  76     int              prop_alloc;      /* number of allocated window properties */
  77     struct property *properties;      /* window properties array */
  78 };
  79
  80 static struct window *top_window;  /* top-level (desktop) window */
  81
  82
  83 /* retrieve a pointer to a window from its handle */
  84 inline static struct window *get_window( user_handle_t handle )
  85 {
  86     struct window *ret = get_user_object( handle, USER_WINDOW );
  87     if (!ret) set_error( STATUS_INVALID_HANDLE );
  88     return ret;
  89 }
  90
  91 /* unlink a window from the tree */
  92 static void unlink_window( struct window *win )
  93 {
  94     struct window *parent = win->parent;
  95
  96     assert( parent );
  97
  98     if (win->next) win->next->prev = win->prev;
  99     else if (parent->last_child == win) parent->last_child = win->prev;
 100
 101     if (win->prev) win->prev->next = win->next;
 102     else if (parent->first_child == win) parent->first_child = win->next;
 103     else if (parent->first_unlinked == win) parent->first_unlinked = win->next;
 104 }
 105
 106
 107 /* link a window into the tree (or unlink it if the new parent is NULL)  */
 108 static void link_window( struct window *win, struct window *parent, struct window *previous )
 109 {
 110     unlink_window( win );  /* unlink it from the previous location */
 111
 112     if (parent)
 113     {
 114         win->parent = parent;
 115         if ((win->prev = previous))
 116         {
 117             if ((win->next = previous->next)) win->next->prev = win;
 118             else if (win->parent->last_child == previous) win->parent->last_child = win;
 119             win->prev->next = win;
 120         }
 121         else
 122         {
 123             if ((win->next = parent->first_child)) win->next->prev = win;
 124             else win->parent->last_child = win;
 125             parent->first_child = win;
 126         }
 127     }
 128     else  /* move it to parent unlinked list */
 129     {
 130         parent = win->parent;
 131         if ((win->next = parent->first_unlinked)) win->next->prev = win;
 132         win->prev = NULL;
 133         parent->first_unlinked = win;
 134     }
 135 }
 136
 137 /* set a window property */
 138 static void set_property( struct window *win, atom_t atom, obj_handle_t handle,
 139                           enum property_type type )
 140 {
 141     int i, free = -1;
 142     struct property *new_props;
 143
 144     /* check if it exists already */
 145     for (i = 0; i < win->prop_inuse; i++)
 146     {
 147         if (win->properties[i].type == PROP_TYPE_FREE)
 148         {
 149             free = i;
 150             continue;
 151         }
 152         if (win->properties[i].atom == atom)
 153         {
 154             win->properties[i].type = type;
 155             win->properties[i].handle = handle;
 156             return;
 157         }
 158     }
 159
 160     /* need to add an entry */
 161     if (!grab_global_atom( atom )) return;
 162     if (free == -1)
 163     {
 164         /* no free entry */
 165         if (win->prop_inuse >= win->prop_alloc)
 166         {
 167             /* need to grow the array */
 168             if (!(new_props = realloc( win->properties,
 169                                        sizeof(*new_props) * (win->prop_alloc + 16) )))
 170             {
 171                 set_error( STATUS_NO_MEMORY );
 172                 release_global_atom( atom );
 173                 return;
 174             }
 175             win->prop_alloc += 16;
 176             win->properties = new_props;
 177         }
 178         free = win->prop_inuse++;
 179     }
 180     win->properties[free].atom   = atom;
 181     win->properties[free].type   = type;
 182     win->properties[free].handle = handle;
 183 }
 184
 185 /* remove a window property */
 186 static obj_handle_t remove_property( struct window *win, atom_t atom )
 187 {
 188     int i;
 189
 190     for (i = 0; i < win->prop_inuse; i++)
 191     {
 192         if (win->properties[i].type == PROP_TYPE_FREE) continue;
 193         if (win->properties[i].atom == atom)
 194         {
 195             release_global_atom( atom );
 196             win->properties[i].type = PROP_TYPE_FREE;
 197             return win->properties[i].handle;
 198         }
 199     }
 200     /* FIXME: last error? */
 201     return 0;
 202 }
 203
 204 /* find a window property */
 205 static obj_handle_t get_property( struct window *win, atom_t atom )
 206 {
 207     int i;
 208
 209     for (i = 0; i < win->prop_inuse; i++)
 210     {
 211         if (win->properties[i].type == PROP_TYPE_FREE) continue;
 212         if (win->properties[i].atom == atom) return win->properties[i].handle;
 213     }
 214     /* FIXME: last error? */
 215     return 0;
 216 }
 217
 218 /* destroy all properties of a window */
 219 inline static void destroy_properties( struct window *win )
 220 {
 221     int i;
 222
 223     if (!win->properties) return;
 224     for (i = 0; i < win->prop_inuse; i++)
 225     {
 226         if (win->properties[i].type == PROP_TYPE_FREE) continue;
 227         release_global_atom( win->properties[i].atom );
 228     }
 229     free( win->properties );
 230 }
 231
 232 /* destroy a window */
 233 static void destroy_window( struct window *win )
 234 {
 235     assert( win != top_window );
 236
 237     /* destroy all children */
 238     while (win->first_child) destroy_window( win->first_child );
 239     while (win->first_unlinked) destroy_window( win->first_unlinked );
 240
 241     if (win->thread->queue)
 242     {
 243         if (win->paint_count) inc_queue_paint_count( win->thread, -win->paint_count );
 244         queue_cleanup_window( win->thread, win->handle );
 245     }
 246     free_user_handle( win->handle );
 247     destroy_properties( win );
 248     unlink_window( win );
 249     if (win->text) free( win->text );
 250     memset( win, 0x55, sizeof(*win) );
 251     free( win );
 252 }
 253
 254 /* create a new window structure (note: the window is not linked in the window tree) */
 255 static struct window *create_window( struct window *parent, struct window *owner, atom_t atom )
 256 {
 257     struct window *win = mem_alloc( sizeof(*win) );
 258     if (!win) return NULL;
 259
 260     if (!(win->handle = alloc_user_handle( win, USER_WINDOW )))
 261     {
 262         free( win );
 263         return NULL;
 264     }
 265     win->parent         = parent;
 266     win->owner          = owner ? owner->handle : 0;
 267     win->first_child    = NULL;
 268     win->last_child     = NULL;
 269     win->first_unlinked = NULL;
 270     win->thread         = current;
 271     win->atom           = atom;
 272     win->last_active    = win->handle;
 273     win->style          = 0;
 274     win->ex_style       = 0;
 275     win->id             = 0;
 276     win->instance       = NULL;
 277     win->user_data      = NULL;
 278     win->text           = NULL;
 279     win->paint_count    = 0;
 280     win->prop_inuse     = 0;
 281     win->prop_alloc     = 0;
 282     win->properties     = NULL;
 283
 284     if (parent)  /* put it on parent unlinked list */
 285     {
 286         if ((win->next = parent->first_unlinked)) win->next->prev = win;
 287         win->prev = NULL;
 288         parent->first_unlinked = win;
 289     }
 290     else win->next = win->prev = NULL;
 291
 292     /* if parent belongs to a different thread, attach the two threads */
 293     if (parent && parent->thread && parent->thread != current)
 294         attach_thread_input( current, parent->thread );
 295     return win;
 296 }
 297
 298 /* destroy all windows belonging to a given thread */
 299 void destroy_thread_windows( struct thread *thread )
 300 {
 301     user_handle_t handle = 0;
 302     struct window *win;
 303
 304     while ((win = next_user_handle( &handle, USER_WINDOW )))
 305     {
 306         if (win->thread != thread) continue;
 307         destroy_window( win );
 308     }
 309 }
 310
 311 /* check whether child is a descendant of parent */
 312 int is_child_window( user_handle_t parent, user_handle_t child )
 313 {
 314     struct window *child_ptr = get_user_object( child, USER_WINDOW );
 315     struct window *parent_ptr = get_user_object( parent, USER_WINDOW );
 316
 317     if (!child_ptr || !parent_ptr) return 0;
 318     while (child_ptr->parent)
 319     {
 320         if (child_ptr->parent == parent_ptr) return 1;
 321         child_ptr = child_ptr->parent;
 322     }
 323     return 0;
 324 }
 325
 326 /* check whether window is a top-level window */
 327 int is_top_level_window( user_handle_t window )
 328 {
 329     struct window *win = get_user_object( window, USER_WINDOW );
 330     return (win && win->parent == top_window);
 331 }
 332
 333 /* make a window active if possible */
 334 int make_window_active( user_handle_t window )
 335 {
 336     struct window *owner, *win = get_window( window );
 337
 338     if (!win) return 0;
 339
 340     /* set last active for window and its owner */
 341     win->last_active = win->handle;
 342     if ((owner = get_user_object( win->owner, USER_WINDOW ))) owner->last_active = win->handle;
 343     return 1;
 344 }
 345
 346
 347 /* return the thread owning a window */
 348 struct thread *get_window_thread( user_handle_t handle )
 349 {
 350     struct window *win = get_user_object( handle, USER_WINDOW );
 351     if (!win || !win->thread) return NULL;
 352     return (struct thread *)grab_object( win->thread );
 353 }
 354
 355 /* find a child of the specified window that needs repainting */
 356 static struct window *find_child_to_repaint( struct window *parent, struct thread *thread )
 357 {
 358     struct window *ptr, *ret = NULL;
 359
 360     for (ptr = parent->first_child; ptr && !ret; ptr = ptr->next)
 361     {
 362         if (!(ptr->style & WS_VISIBLE)) continue;
 363         if (ptr->paint_count && ptr->thread == thread)
 364             ret = ptr;
 365         else /* explore its children */
 366             ret = find_child_to_repaint( ptr, thread );
 367     }
 368
 369     if (ret && (ret->ex_style & WS_EX_TRANSPARENT))
 370     {
 371         /* transparent window, check for non-transparent sibling to paint first */
 372         for (ptr = ret->next; ptr; ptr = ptr->next)
 373         {
 374             if (!(ptr->style & WS_VISIBLE)) continue;
 375             if (ptr->ex_style & WS_EX_TRANSPARENT) continue;
 376             if (ptr->paint_count && ptr->thread == thread) return ptr;
 377         }
 378     }
 379     return ret;
 380 }
 381
 382
 383 /* find a window that needs repainting */
 384 user_handle_t find_window_to_repaint( user_handle_t parent, struct thread *thread )
 385 {
 386     struct window *win = parent ? get_window( parent ) : top_window;
 387
 388     if (!win || !(win->style & WS_VISIBLE)) return 0;
 389     if (!win->paint_count || win->thread != thread)
 390         win = find_child_to_repaint( win, thread );
 391     return win ? win->handle : 0;
 392 }
 393
 394
 395 /* create a window */
 396 DECL_HANDLER(create_window)
 397 {
 398     reply->handle = 0;
 399     if (!req->parent)  /* return desktop window */
 400     {
 401         if (!top_window)
 402         {
 403             if (!(top_window = create_window( NULL, NULL, req->atom ))) return;
 404             top_window->thread = NULL;  /* no thread owns the desktop */
 405             top_window->style  = WS_POPUP | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
 406         }
 407         reply->handle = top_window->handle;
 408     }
 409     else
 410     {
 411         struct window *win, *parent, *owner = NULL;
 412
 413         if (!(parent = get_window( req->parent ))) return;
 414         if (req->owner && !(owner = get_window( req->owner ))) return;
 415         if (owner == top_window) owner = NULL;
 416         else if (owner && parent != top_window)
 417         {
 418             /* an owned window must be created as top-level */
 419             set_error( STATUS_ACCESS_DENIED );
 420             return;
 421         }
 422         if (!(win = create_window( parent, owner, req->atom ))) return;
 423         reply->handle = win->handle;
 424     }
 425 }
 426
 427
 428 /* link a window into the tree */
 429 DECL_HANDLER(link_window)
 430 {
 431     struct window *win, *parent = NULL, *previous = NULL;
 432
 433     if (!(win = get_window( req->handle ))) return;
 434     if (req->parent && !(parent = get_window( req->parent ))) return;
 435
 436     if (win == top_window)
 437     {
 438         set_error( STATUS_INVALID_PARAMETER );
 439         return;
 440     }
 441     reply->full_parent = parent ? parent->handle : 0;
 442     if (parent && req->previous)
 443     {
 444         if (req->previous == (user_handle_t)1)  /* special case: HWND_BOTTOM */
 445         {
 446             previous = parent->last_child;
 447             if (previous == win) return;  /* nothing to do */
 448         }
 449         else
 450         {
 451             if (!(previous = get_window( req->previous ))) return;
 452             /* previous must be a child of parent, and not win itself */
 453             if (previous->parent != parent || previous == win)
 454             {
 455                 set_error( STATUS_INVALID_PARAMETER );
 456                 return;
 457             }
 458         }
 459     }
 460     link_window( win, parent, previous );
 461 }
 462
 463
 464 /* destroy a window */
 465 DECL_HANDLER(destroy_window)
 466 {
 467     struct window *win = get_window( req->handle );
 468     if (win)
 469     {
 470         if (win != top_window) destroy_window( win );
 471         else set_error( STATUS_ACCESS_DENIED );
 472     }
 473 }
 474
 475
 476 /* set a window owner */
 477 DECL_HANDLER(set_window_owner)
 478 {
 479     struct window *win = get_window( req->handle );
 480     struct window *owner = NULL;
 481
 482     if (!win) return;
 483     if (req->owner && !(owner = get_window( req->owner ))) return;
 484     if (win == top_window)
 485     {
 486         set_error( STATUS_ACCESS_DENIED );
 487         return;
 488     }
 489     reply->prev_owner = win->owner;
 490     reply->full_owner = win->owner = owner ? owner->handle : 0;
 491 }
 492
 493
 494 /* get information from a window handle */
 495 DECL_HANDLER(get_window_info)
 496 {
 497     struct window *win = get_window( req->handle );
 498
 499     reply->full_handle = 0;
 500     reply->tid = reply->pid = 0;
 501     if (win)
 502     {
 503         reply->full_handle = win->handle;
 504         reply->last_active = win->handle;
 505         if (get_user_object( win->last_active, USER_WINDOW )) reply->last_active = win->last_active;
 506         if (win->thread)
 507         {
 508             reply->tid  = get_thread_id( win->thread );
 509             reply->pid  = get_process_id( win->thread->process );
 510             reply->atom = win->atom;
 511         }
 512     }
 513 }
 514
 515
 516 /* set some information in a window */
 517 DECL_HANDLER(set_window_info)
 518 {
 519     struct window *win = get_window( req->handle );
 520
 521     if (!win) return;
 522     if (req->flags && win == top_window)
 523     {
 524         set_error( STATUS_ACCESS_DENIED );
 525         return;
 526     }
 527     reply->old_style     = win->style;
 528     reply->old_ex_style  = win->ex_style;
 529     reply->old_id        = win->id;
 530     reply->old_instance  = win->instance;
 531     reply->old_user_data = win->user_data;
 532     if (req->flags & SET_WIN_STYLE) win->style = req->style;
 533     if (req->flags & SET_WIN_EXSTYLE) win->ex_style = req->ex_style;
 534     if (req->flags & SET_WIN_ID) win->id = req->id;
 535     if (req->flags & SET_WIN_INSTANCE) win->instance = req->instance;
 536     if (req->flags & SET_WIN_USERDATA) win->user_data = req->user_data;
 537 }
 538
 539
 540 /* get a list of the window parents, up to the root of the tree */
 541 DECL_HANDLER(get_window_parents)
 542 {
 543     struct window *ptr, *win = get_window( req->handle );
 544     int total = 0;
 545     user_handle_t *data;
 546     size_t len;
 547
 548     if (win) for (ptr = win->parent; ptr; ptr = ptr->parent) total++;
 549
 550     reply->count = total;
 551     len = min( get_reply_max_size(), total * sizeof(user_handle_t) );
 552     if (len && ((data = set_reply_data_size( len ))))
 553     {
 554         for (ptr = win->parent; ptr && len; ptr = ptr->parent, len -= sizeof(*data))
 555             *data++ = ptr->handle;
 556     }
 557 }
 558
 559
 560 /* get a list of the window children */
 561 DECL_HANDLER(get_window_children)
 562 {
 563     struct window *ptr, *parent = get_window( req->parent );
 564     int total = 0;
 565     user_handle_t *data;
 566     size_t len;
 567
 568     if (parent)
 569         for (ptr = parent->first_child, total = 0; ptr; ptr = ptr->next)
 570         {
 571             if (req->atom && ptr->atom != req->atom) continue;
 572             if (req->tid && get_thread_id(ptr->thread) != req->tid) continue;
 573             total++;
 574         }
 575
 576     reply->count = total;
 577     len = min( get_reply_max_size(), total * sizeof(user_handle_t) );
 578     if (len && ((data = set_reply_data_size( len ))))
 579     {
 580         for (ptr = parent->first_child; ptr && len; ptr = ptr->next)
 581         {
 582             if (req->atom && ptr->atom != req->atom) continue;
 583             if (req->tid && get_thread_id(ptr->thread) != req->tid) continue;
 584             *data++ = ptr->handle;
 585             len -= sizeof(*data);
 586         }
 587     }
 588 }
 589
 590
 591 /* get window tree information from a window handle */
 592 DECL_HANDLER(get_window_tree)
 593 {
 594     struct window *win = get_window( req->handle );
 595
 596     if (!win) return;
 597
 598     if (win->parent)
 599     {
 600         struct window *parent = win->parent;
 601         reply->parent        = parent->handle;
 602         reply->owner         = win->owner;
 603         reply->next_sibling  = win->next ? win->next->handle : 0;
 604         reply->prev_sibling  = win->prev ? win->prev->handle : 0;
 605         reply->first_sibling = parent->first_child ? parent->first_child->handle : 0;
 606         reply->last_sibling  = parent->last_child ? parent->last_child->handle : 0;
 607     }
 608     else
 609     {
 610         reply->parent        = 0;
 611         reply->owner         = 0;
 612         reply->next_sibling  = 0;
 613         reply->prev_sibling  = 0;
 614         reply->first_sibling = 0;
 615         reply->last_sibling  = 0;
 616     }
 617     reply->first_child = win->first_child ? win->first_child->handle : 0;
 618     reply->last_child  = win->last_child ? win->last_child->handle : 0;
 619 }
 620
 621
 622 /* set the window and client rectangles of a window */
 623 DECL_HANDLER(set_window_rectangles)
 624 {
 625     struct window *win = get_window( req->handle );
 626
 627     if (win)
 628     {
 629         win->window_rect = req->window;
 630         win->client_rect = req->client;
 631     }
 632 }
 633
 634
 635 /* get the window and client rectangles of a window */
 636 DECL_HANDLER(get_window_rectangles)
 637 {
 638     struct window *win = get_window( req->handle );
 639
 640     if (win)
 641     {
 642         reply->window = win->window_rect;
 643         reply->client = win->client_rect;
 644     }
 645 }
 646
 647
 648 /* get the window text */
 649 DECL_HANDLER(get_window_text)
 650 {
 651     struct window *win = get_window( req->handle );
 652
 653     if (win && win->text)
 654     {
 655         size_t len = strlenW( win->text ) * sizeof(WCHAR);
 656         if (len > get_reply_max_size()) len = get_reply_max_size();
 657         set_reply_data( win->text, len );
 658     }
 659 }
 660
 661
 662 /* set the window text */
 663 DECL_HANDLER(set_window_text)
 664 {
 665     struct window *win = get_window( req->handle );
 666
 667     if (win)
 668     {
 669         WCHAR *text = NULL;
 670         size_t len = get_req_data_size() / sizeof(WCHAR);
 671         if (len)
 672         {
 673             if (!(text = mem_alloc( (len+1) * sizeof(WCHAR) ))) return;
 674             memcpy( text, get_req_data(), len * sizeof(WCHAR) );
 675             text[len] = 0;
 676         }
 677         if (win->text) free( win->text );
 678         win->text = text;
 679     }
 680 }
 681
 682
 683 /* increment the window paint count */
 684 DECL_HANDLER(inc_window_paint_count)
 685 {
 686     struct window *win = get_window( req->handle );
 687
 688     if (win && win->thread)
 689     {
 690         int old = win->paint_count;
 691         if ((win->paint_count += req->incr) < 0) win->paint_count = 0;
 692         inc_queue_paint_count( win->thread, win->paint_count - old );
 693     }
 694 }
 695
 696
 697 /* get the coordinates offset between two windows */
 698 DECL_HANDLER(get_windows_offset)
 699 {
 700     struct window *win;
 701
 702     reply->x = reply->y = 0;
 703     if (req->from)
 704     {
 705         if (!(win = get_window( req->from ))) return;
 706         while (win)
 707         {
 708             reply->x += win->client_rect.left;
 709             reply->y += win->client_rect.top;
 710             win = win->parent;
 711         }
 712     }
 713     if (req->to)
 714     {
 715         if (!(win = get_window( req->to ))) return;
 716         while (win)
 717         {
 718             reply->x -= win->client_rect.left;
 719             reply->y -= win->client_rect.top;
 720             win = win->parent;
 721         }
 722     }
 723 }
 724
 725
 726 /* set a window property */
 727 DECL_HANDLER(set_window_property)
 728 {
 729     struct window *win = get_window( req->window );
 730
 731     if (win) set_property( win, req->atom, req->handle,
 732                            req->string ? PROP_TYPE_STRING : PROP_TYPE_ATOM );
 733 }
 734
 735
 736 /* remove a window property */
 737 DECL_HANDLER(remove_window_property)
 738 {
 739     struct window *win = get_window( req->window );
 740     reply->handle = 0;
 741     if (win) reply->handle = remove_property( win, req->atom );
 742 }
 743
 744
 745 /* get a window property */
 746 DECL_HANDLER(get_window_property)
 747 {
 748     struct window *win = get_window( req->window );
 749     reply->handle = 0;
 750     if (win) reply->handle = get_property( win, req->atom );
 751 }
 752
 753
 754 /* get the list of properties of a window */
 755 DECL_HANDLER(get_window_properties)
 756 {
 757     property_data_t *data;
 758     int i, count, max = get_reply_max_size() / sizeof(*data);
 759     struct window *win = get_window( req->window );
 760
 761     reply->total = 0;
 762     if (!win) return;
 763
 764     for (i = count = 0; i < win->prop_inuse; i++)
 765         if (win->properties[i].type != PROP_TYPE_FREE) count++;
 766     reply->total = count;
 767
 768     if (count > max) count = max;
 769     if (!count || !(data = set_reply_data_size( count * sizeof(*data) ))) return;
 770
 771     for (i = 0; i < win->prop_inuse && count; i++)
 772     {
 773         if (win->properties[i].type == PROP_TYPE_FREE) continue;
 774         data->atom   = win->properties[i].atom;
 775         data->string = (win->properties[i].type == PROP_TYPE_STRING);
 776         data->handle = win->properties[i].handle;
 777         data++;
 778         count--;
 779     }
 780 }