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"
31 #define WIN32_NO_STATUS
33 #include "wine/list.h"
44 struct list entry; /* entry in process list */
45 struct process *process; /* process owning the class */
46 int count; /* reference count */
47 int local; /* local class? */
48 atom_t atom; /* class atom */
49 void *instance; /* module instance */
50 unsigned int style; /* class style */
51 int win_extra; /* number of window extra bytes */
52 void *client_ptr; /* pointer to class in client address space */
53 int nb_extra_bytes; /* number of extra bytes */
54 char extra_bytes[1]; /* extra bytes storage */
57 static struct window_class *desktop_class;
59 static struct window_class *create_class( struct process *process, int extra_bytes, int local )
61 struct window_class *class;
63 if (!(class = mem_alloc( sizeof(*class) + extra_bytes - 1 ))) return NULL;
65 class->process = (struct process *)grab_object( process );
68 class->nb_extra_bytes = extra_bytes;
69 memset( class->extra_bytes, 0, extra_bytes );
70 /* other fields are initialized by caller */
72 /* local classes have priority so we put them first in the list */
73 if (local) list_add_head( &process->classes, &class->entry );
74 else list_add_tail( &process->classes, &class->entry );
78 static struct window_class *get_desktop_class(void)
82 if (!(desktop_class = mem_alloc( sizeof(*desktop_class) - 1 ))) return NULL;
83 desktop_class->process = NULL;
84 desktop_class->count = 0;
85 desktop_class->local = 0;
86 desktop_class->nb_extra_bytes = 0;
87 desktop_class->atom = DESKTOP_ATOM;
88 desktop_class->instance = NULL;
89 desktop_class->style = CS_DBLCLKS;
90 desktop_class->win_extra = 0;
91 desktop_class->client_ptr = NULL;
96 static void destroy_class( struct window_class *class )
98 list_remove( &class->entry );
99 release_object( class->process );
103 void destroy_process_classes( struct process *process )
107 while ((ptr = list_head( &process->classes )))
109 struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
110 destroy_class( class );
114 static struct window_class *find_class( struct process *process, atom_t atom, void *instance )
118 LIST_FOR_EACH( ptr, &process->classes )
120 struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
121 if (class->atom != atom) continue;
122 if (!instance || !class->local || class->instance == instance) return class;
124 if (atom == DESKTOP_ATOM) return get_desktop_class();
128 struct window_class *grab_class( struct process *process, atom_t atom,
129 void *instance, int *extra_bytes )
131 struct window_class *class = find_class( process, atom, instance );
135 *extra_bytes = class->win_extra;
137 else set_error( STATUS_INVALID_HANDLE );
141 void release_class( struct window_class *class )
143 assert( class->count > 0 );
147 atom_t get_class_atom( struct window_class *class )
152 void *get_class_client_ptr( struct window_class *class )
154 return class->client_ptr;
157 /* create a window class */
158 DECL_HANDLER(create_class)
160 struct window_class *class;
161 struct winstation *winstation;
163 if (!req->local && req->atom == DESKTOP_ATOM)
164 return; /* silently ignore 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 );
179 if (!(winstation = get_process_winstation( current->process, WINSTA_ACCESSGLOBALATOMS )))
182 if (!grab_global_atom( winstation, req->atom ))
184 release_object( winstation );
187 if (!(class = create_class( current->process, req->extra, req->local )))
189 release_global_atom( winstation, req->atom );
190 release_object( winstation );
193 class->atom = req->atom;
194 class->instance = req->instance;
195 class->style = req->style;
196 class->win_extra = req->win_extra;
197 class->client_ptr = req->client_ptr;
198 release_object( winstation );
201 /* destroy a window class */
202 DECL_HANDLER(destroy_class)
204 struct window_class *class = find_class( current->process, req->atom, req->instance );
207 set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
208 else if (class->count)
209 set_win32_error( ERROR_CLASS_HAS_WINDOWS );
212 reply->client_ptr = class->client_ptr;
213 if (class != desktop_class) destroy_class( class );
218 /* set some information in a class */
219 DECL_HANDLER(set_class_info)
221 struct window_class *class = get_window_class( req->window );
225 if (req->flags && class->process != current->process)
227 set_error( STATUS_ACCESS_DENIED );
231 if (req->extra_size > sizeof(req->extra_value) ||
232 req->extra_offset < -1 ||
233 req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
235 set_win32_error( ERROR_INVALID_INDEX );
238 if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
240 set_error( STATUS_INVALID_PARAMETER );
243 if (req->extra_offset != -1)
245 memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
247 else if (req->flags & SET_CLASS_EXTRA)
249 set_win32_error( ERROR_INVALID_INDEX );
253 reply->old_atom = class->atom;
254 reply->old_style = class->style;
255 reply->old_extra = class->nb_extra_bytes;
256 reply->old_win_extra = class->win_extra;
257 reply->old_instance = class->instance;
259 if (req->flags & SET_CLASS_ATOM)
261 struct winstation *winstation = get_process_winstation( current->process,
262 WINSTA_ACCESSGLOBALATOMS );
263 if (!grab_global_atom( winstation, req->atom ))
265 release_object( winstation );
268 release_global_atom( winstation, class->atom );
269 class->atom = req->atom;
270 release_object( winstation );
272 if (req->flags & SET_CLASS_STYLE) class->style = req->style;
273 if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
274 if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
275 if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
276 &req->extra_value, req->extra_size );