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 *create_class( struct process *process, int extra_bytes, int local )
59 struct window_class *class;
61 if (!(class = mem_alloc( sizeof(*class) + extra_bytes - 1 ))) return NULL;
63 class->process = (struct process *)grab_object( process );
66 class->nb_extra_bytes = extra_bytes;
67 memset( class->extra_bytes, 0, extra_bytes );
68 /* other fields are initialized by caller */
70 /* local classes have priority so we put them first in the list */
71 if (local) list_add_head( &process->classes, &class->entry );
72 else list_add_tail( &process->classes, &class->entry );
76 static void destroy_class( struct window_class *class )
78 list_remove( &class->entry );
79 release_object( class->process );
83 void destroy_process_classes( struct process *process )
87 while ((ptr = list_head( &process->classes )))
89 struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
90 destroy_class( class );
94 static struct window_class *find_class( struct process *process, atom_t atom, void *instance )
98 LIST_FOR_EACH( ptr, &process->classes )
100 struct window_class *class = LIST_ENTRY( ptr, struct window_class, entry );
101 if (class->atom != atom) continue;
102 if (!instance || !class->local || class->instance == instance) return class;
107 struct window_class *grab_class( struct process *process, atom_t atom,
108 void *instance, int *extra_bytes )
110 struct window_class *class = find_class( process, atom, instance );
114 *extra_bytes = class->win_extra;
116 else set_error( STATUS_INVALID_HANDLE );
120 void release_class( struct window_class *class )
122 assert( class->count > 0 );
126 int is_desktop_class( struct window_class *class )
128 return (class->atom == DESKTOP_ATOM && !class->local);
131 atom_t get_class_atom( struct window_class *class )
136 void *get_class_client_ptr( struct window_class *class )
138 return class->client_ptr;
141 /* create a window class */
142 DECL_HANDLER(create_class)
144 struct window_class *class;
146 class = find_class( current->process, req->atom, req->instance );
147 if (class && !class->local == !req->local)
149 set_win32_error( ERROR_CLASS_ALREADY_EXISTS );
152 if (req->extra < 0 || req->extra > 4096 || req->win_extra < 0 || req->win_extra > 4096)
154 /* don't allow stupid values here */
155 set_error( STATUS_INVALID_PARAMETER );
159 if (!grab_global_atom( NULL, req->atom )) return;
161 if (!(class = create_class( current->process, req->extra, req->local )))
163 release_global_atom( NULL, req->atom );
166 class->atom = req->atom;
167 class->instance = req->instance;
168 class->style = req->style;
169 class->win_extra = req->win_extra;
170 class->client_ptr = req->client_ptr;
173 /* destroy a window class */
174 DECL_HANDLER(destroy_class)
176 struct window_class *class = find_class( current->process, req->atom, req->instance );
179 set_win32_error( ERROR_CLASS_DOES_NOT_EXIST );
180 else if (class->count)
181 set_win32_error( ERROR_CLASS_HAS_WINDOWS );
184 reply->client_ptr = class->client_ptr;
185 destroy_class( class );
190 /* set some information in a class */
191 DECL_HANDLER(set_class_info)
193 struct window_class *class = get_window_class( req->window );
197 if (req->flags && class->process != current->process)
199 set_error( STATUS_ACCESS_DENIED );
203 if (req->extra_size > sizeof(req->extra_value) ||
204 req->extra_offset < -1 ||
205 req->extra_offset > class->nb_extra_bytes - (int)req->extra_size)
207 set_win32_error( ERROR_INVALID_INDEX );
210 if ((req->flags & SET_CLASS_WINEXTRA) && (req->win_extra < 0 || req->win_extra > 4096))
212 set_error( STATUS_INVALID_PARAMETER );
215 if (req->extra_offset != -1)
217 memcpy( &reply->old_extra_value, class->extra_bytes + req->extra_offset, req->extra_size );
219 else if (req->flags & SET_CLASS_EXTRA)
221 set_win32_error( ERROR_INVALID_INDEX );
225 reply->old_atom = class->atom;
226 reply->old_style = class->style;
227 reply->old_extra = class->nb_extra_bytes;
228 reply->old_win_extra = class->win_extra;
229 reply->old_instance = class->instance;
231 if (req->flags & SET_CLASS_ATOM)
233 if (!grab_global_atom( NULL, req->atom )) return;
234 release_global_atom( NULL, class->atom );
235 class->atom = req->atom;
237 if (req->flags & SET_CLASS_STYLE) class->style = req->style;
238 if (req->flags & SET_CLASS_WINEXTRA) class->win_extra = req->win_extra;
239 if (req->flags & SET_CLASS_INSTANCE) class->instance = req->instance;
240 if (req->flags & SET_CLASS_EXTRA) memcpy( class->extra_bytes + req->extra_offset,
241 &req->extra_value, req->extra_size );