2 * Server-side window class management
4 * Copyright (C) 2002 Mike McCormack
5 * Copyright (C) 2003 Alexandre Julliard
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "wine/port.h"
30 #include "wine/list.h"
39 struct list entry; /* entry in process list */
40 struct process *process; /* process owning the class */
41 int count; /* reference count */
42 int local; /* local class? */
43 atom_t atom; /* class atom */
44 void *instance; /* module instance */
45 unsigned int style; /* class style */
46 int win_extra; /* number of window extra bytes */
47 void *client_ptr; /* pointer to class in client address space */
48 int nb_extra_bytes; /* number of extra bytes */
49 char extra_bytes[1]; /* extra bytes storage */
52 #define DESKTOP_ATOM ((atom_t)32769)
54 static struct window_class *desktop_class;
56 static struct window_class *create_class( struct process *process, int extra_bytes, int local )
58 struct window_class *class;
60 if (!(class = mem_alloc( sizeof(*class) + extra_bytes - 1 ))) return NULL;
62 class->process = (struct process *)grab_object( process );
65 class->nb_extra_bytes = extra_bytes;
66 memset( class->extra_bytes, 0, extra_bytes );
67 /* other fields are initialized by caller */
69 /* local classes have priority so we put them first in the list */
70 if (local) list_add_head( &process->classes, &class->entry );
71 else list_add_tail( &process->classes, &class->entry );
75 static struct window_class *create_desktop_class( unsigned int style, int win_extra )
77 struct window_class *class;
79 if (!(class = mem_alloc( sizeof(*class) - 1 ))) return NULL;
81 class->process = NULL;
84 class->nb_extra_bytes = 0;
85 class->atom = DESKTOP_ATOM;
86 class->instance = NULL;
88 class->win_extra = win_extra;
89 class->client_ptr = NULL;
90 desktop_class = class;
94 static void destroy_class( struct window_class *class )
96 list_remove( &class->entry );
97 release_object( class->process );
101 void destroy_process_classes( struct process *process )
105 while ((ptr = list_head( &process->classes )))
107 struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
108 destroy_class( class );
112 static struct window_class *find_class( struct process *process, atom_t atom, void *instance )
116 LIST_FOR_EACH( ptr, &process->classes )
118 struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
119 if (class->atom != atom) continue;
120 if (!instance || !class->local || class->instance == instance) return class;
122 if (atom == DESKTOP_ATOM) return desktop_class;
126 struct window_class *grab_class( struct process *process, atom_t atom,
127 void *instance, int *extra_bytes )
129 struct window_class *class = find_class( process, atom, instance );
133 *extra_bytes = class->win_extra;
135 else set_error( STATUS_INVALID_HANDLE );
139 void release_class( struct window_class *class )
141 assert( class->count > 0 );
145 atom_t get_class_atom( struct window_class *class )
150 void *get_class_client_ptr( struct window_class *class )
152 return class->client_ptr;
155 /* create a window class */
156 DECL_HANDLER(create_class)
158 struct window_class *class;
160 if (!req->local && req->atom == DESKTOP_ATOM)
162 if (!desktop_class) create_desktop_class( req->style, req->win_extra );
163 return; /* silently ignore further attempts to create the desktop class */
166 class = find_class( current->process, req->atom, req->instance );
167 if (class && !class->local == !req->local)
169 set_win32_error( ERROR_CLASS_ALREADY_EXISTS );
172 if (req->extra < 0 || req->extra > 4096 || req->win_extra < 0 || req->win_extra > 4096)
174 /* don't allow stupid values here */
175 set_error( STATUS_INVALID_PARAMETER );
178 if (!grab_global_atom( req->atom )) return;
180 if (!(class = create_class( current->process, req->extra, req->local )))
182 release_global_atom( req->atom );
185 class->atom = req->atom;
186 class->instance = req->instance;
187 class->style = req->style;
188 class->win_extra = req->win_extra;
189 class->client_ptr = req->client_ptr;
192 /* destroy a window class */
193 DECL_HANDLER(destroy_class)
195 struct window_class *class = find_class( current->process, req->atom, req->instance );
198 set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
199 else if (class->count)
200 set_win32_error( ERROR_CLASS_HAS_WINDOWS );
203 reply->client_ptr = class->client_ptr;
204 if (class != desktop_class) destroy_class( class );
209 /* set some information in a class */
210 DECL_HANDLER(set_class_info)
212 struct window_class *class = get_window_class( req->window );
216 if (req->flags && class->process != current->process)
218 set_error( STATUS_ACCESS_DENIED );
222 if (req->extra_size > sizeof(req->extra_value) ||
223 req->extra_offset < -1 ||
224 req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
226 set_win32_error( ERROR_INVALID_INDEX );
229 if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
231 set_error( STATUS_INVALID_PARAMETER );
234 if (req->extra_offset != -1)
236 memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
238 else if (req->flags & SET_CLASS_EXTRA)
240 set_win32_error( ERROR_INVALID_INDEX );
244 reply->old_atom = class->atom;
245 reply->old_style = class->style;
246 reply->old_extra = class->nb_extra_bytes;
247 reply->old_win_extra = class->win_extra;
248 reply->old_instance = class->instance;
250 if (req->flags & SET_CLASS_ATOM)
252 if (!grab_global_atom( req->atom )) return;
253 release_global_atom( class->atom );
254 class->atom = req->atom;
256 if (req->flags & SET_CLASS_STYLE) class->style = req->style;
257 if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
258 if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
259 if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
260 &req->extra_value, req->extra_size );