dlls/windows.gaming.input/event_handlers.c

   1 /* WinRT Windows.Gaming.Input implementation
   2  *
   3  * Copyright 2022 Rémi Bernon for CodeWeavers
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  18  */
  19
  20 #include "private.h"
  21
  22 static CRITICAL_SECTION handlers_cs;
  23 static CRITICAL_SECTION_DEBUG handlers_cs_debug =
  24 {
  25     0, 0, &handlers_cs,
  26     { &handlers_cs_debug.ProcessLocksList, &handlers_cs_debug.ProcessLocksList },
  27       0, 0, { (DWORD_PTR)(__FILE__ ": handlers_cs") }
  28 };
  29 static CRITICAL_SECTION handlers_cs = { &handlers_cs_debug, -1, 0, 0, 0, 0 };
  30 static EventRegistrationToken next_token = {.value = 1};
  31
  32 struct handler_entry
  33 {
  34     struct list entry;
  35     EventRegistrationToken token;
  36     IEventHandler_IInspectable *handler;
  37 };
  38
  39 HRESULT event_handlers_append( struct list *list, IEventHandler_IInspectable *handler, EventRegistrationToken *token )
  40 {
  41     struct handler_entry *entry;
  42
  43     if (!(entry = calloc( 1, sizeof(*entry) ))) return E_OUTOFMEMORY;
  44     IEventHandler_IInspectable_AddRef( (entry->handler = handler) );
  45
  46     EnterCriticalSection( &handlers_cs );
  47
  48     *token = entry->token = next_token;
  49     next_token.value++;
  50     list_add_tail( list, &entry->entry );
  51
  52     LeaveCriticalSection( &handlers_cs );
  53
  54     return S_OK;
  55 }
  56
  57 HRESULT event_handlers_remove( struct list *list, EventRegistrationToken *token )
  58 {
  59     struct handler_entry *entry;
  60     BOOL found = FALSE;
  61
  62     EnterCriticalSection( &handlers_cs );
  63
  64     LIST_FOR_EACH_ENTRY( entry, list, struct handler_entry, entry )
  65         if ((found = !memcmp( &entry->token, token, sizeof(*token) ))) break;
  66     if (found) list_remove( &entry->entry );
  67
  68     LeaveCriticalSection( &handlers_cs );
  69
  70     if (found)
  71     {
  72         IEventHandler_IInspectable_Release( entry->handler );
  73         free( entry );
  74     }
  75
  76     return S_OK;
  77 }
  78
  79 void event_handlers_notify( struct list *list, IInspectable *element )
  80 {
  81     struct handler_entry *entry;
  82
  83     EnterCriticalSection( &handlers_cs );
  84
  85     LIST_FOR_EACH_ENTRY( entry, list, struct handler_entry, entry )
  86         IEventHandler_IInspectable_Invoke( entry->handler, NULL, element );
  87
  88     LeaveCriticalSection( &handlers_cs );
  89 }