programs/explorer/appbar.c

   1 /*
   2  * SHAppBarMessage implementation
   3  *
   4  * Copyright 2008 Vincent Povirk for CodeWeavers
   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * TODO: freedesktop _NET_WM_STRUT integration
  21  *
  22  * TODO: find when a fullscreen app is in the foreground and send FULLSCREENAPP
  23  *  notifications
  24  *
  25  * TODO: detect changes in the screen size and send ABN_POSCHANGED ?
  26  *
  27  * TODO: multiple monitor support
  28  */
  29
  30 #include "windows.h"
  31 #include "shellapi.h"
  32 #include "wine/unicode.h"
  33 #include "wine/debug.h"
  34 #include "explorer_private.h"
  35
  36 #include "wine/list.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(appbar);
  39
  40 struct appbar_data_msg  /* platform-independent data */
  41 {
  42     LONG      hWnd;
  43     UINT      uCallbackMessage;
  44     UINT      uEdge;
  45     RECT      rc;
  46     ULONGLONG lParam;
  47 };
  48
  49 struct appbar_cmd
  50 {
  51     ULONG  return_map;
  52     DWORD  return_process;
  53     struct appbar_data_msg abd;
  54 };
  55
  56 struct appbar_response
  57 {
  58     ULONGLONG result;
  59     struct appbar_data_msg abd;
  60 };
  61
  62 static HWND appbarmsg_window = NULL;
  63
  64 struct appbar_data
  65 {
  66     struct list entry;
  67     HWND hwnd;
  68     UINT callback_msg;
  69     UINT edge;
  70     RECT rc;
  71     BOOL space_reserved;
  72     /* BOOL autohide; */
  73 };
  74
  75 static struct list appbars = LIST_INIT(appbars);
  76
  77 static struct appbar_data* get_appbar(HWND hwnd)
  78 {
  79     struct appbar_data* data;
  80
  81     LIST_FOR_EACH_ENTRY(data, &appbars, struct appbar_data, entry)
  82     {
  83         if (data->hwnd == hwnd)
  84             return data;
  85     }
  86
  87     return NULL;
  88 }
  89
  90 /* send_poschanged: send ABN_POSCHANGED to every appbar except one */
  91 static void send_poschanged(HWND hwnd)
  92 {
  93     struct appbar_data* data;
  94     LIST_FOR_EACH_ENTRY(data, &appbars, struct appbar_data, entry)
  95     {
  96         if (data->hwnd != hwnd)
  97         {
  98             PostMessageW(data->hwnd, data->callback_msg, ABN_POSCHANGED, 0);
  99         }
 100     }
 101 }
 102
 103 /* appbar_cliprect: cut out parts of the rectangle that interfere with existing appbars */
 104 static void appbar_cliprect( HWND hwnd, RECT *rect )
 105 {
 106     struct appbar_data* data;
 107     LIST_FOR_EACH_ENTRY(data, &appbars, struct appbar_data, entry)
 108     {
 109         if (data->hwnd == hwnd)
 110         {
 111             /* we only care about appbars that were added before this one */
 112             return;
 113         }
 114         if (data->space_reserved)
 115         {
 116             /* move in the side that corresponds to the other appbar's edge */
 117             switch (data->edge)
 118             {
 119             case ABE_BOTTOM:
 120                 rect->bottom = min(rect->bottom, data->rc.top);
 121                 break;
 122             case ABE_LEFT:
 123                 rect->left = max(rect->left, data->rc.right);
 124                 break;
 125             case ABE_RIGHT:
 126                 rect->right = min(rect->right, data->rc.left);
 127                 break;
 128             case ABE_TOP:
 129                 rect->top = max(rect->top, data->rc.bottom);
 130                 break;
 131             }
 132         }
 133     }
 134 }
 135
 136 static UINT_PTR handle_appbarmessage(DWORD msg, struct appbar_data_msg *abd)
 137 {
 138     struct appbar_data* data;
 139     HWND hwnd = LongToHandle( abd->hWnd );
 140
 141     switch (msg)
 142     {
 143     case ABM_NEW:
 144         if (get_appbar(hwnd))
 145         {
 146             /* fail when adding an hwnd the second time */
 147             return FALSE;
 148         }
 149
 150         data = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(struct appbar_data));
 151         if (!data)
 152         {
 153             WINE_ERR("out of memory\n");
 154             return FALSE;
 155         }
 156         data->hwnd = hwnd;
 157         data->callback_msg = abd->uCallbackMessage;
 158
 159         list_add_tail(&appbars, &data->entry);
 160
 161         return TRUE;
 162     case ABM_REMOVE:
 163         if ((data = get_appbar(hwnd)))
 164         {
 165             list_remove(&data->entry);
 166
 167             send_poschanged(hwnd);
 168
 169             HeapFree(GetProcessHeap(), 0, data);
 170         }
 171         else
 172             WINE_WARN("removing hwnd %p not on the list\n", hwnd);
 173         return TRUE;
 174     case ABM_QUERYPOS:
 175         if (abd->uEdge > ABE_BOTTOM)
 176             WINE_WARN("invalid edge %i for %p\n", abd->uEdge, hwnd);
 177         appbar_cliprect( hwnd, &abd->rc );
 178         return TRUE;
 179     case ABM_SETPOS:
 180         if (abd->uEdge > ABE_BOTTOM)
 181         {
 182             WINE_WARN("invalid edge %i for %p\n", abd->uEdge, hwnd);
 183             return TRUE;
 184         }
 185         if ((data = get_appbar(hwnd)))
 186         {
 187             /* calculate acceptable space */
 188             appbar_cliprect( hwnd, &abd->rc );
 189
 190             if (!EqualRect(&abd->rc, &data->rc))
 191                 send_poschanged(hwnd);
 192
 193             /* reserve that space for this appbar */
 194             data->edge = abd->uEdge;
 195             data->rc = abd->rc;
 196             data->space_reserved = TRUE;
 197         }
 198         else
 199         {
 200             WINE_WARN("app sent ABM_SETPOS message for %p without ABM_ADD\n", hwnd);
 201         }
 202         return TRUE;
 203     case ABM_GETSTATE:
 204         WINE_FIXME("SHAppBarMessage(ABM_GETSTATE): stub\n");
 205         return ABS_ALWAYSONTOP | ABS_AUTOHIDE;
 206     case ABM_GETTASKBARPOS:
 207         WINE_FIXME("SHAppBarMessage(ABM_GETTASKBARPOS, hwnd=%p): stub\n", hwnd);
 208         /* Report the taskbar is at the bottom of the screen. */
 209         abd->rc.left = 0;
 210         abd->rc.right = GetSystemMetrics(SM_CXSCREEN);
 211         abd->rc.bottom = GetSystemMetrics(SM_CYSCREEN);
 212         abd->rc.top = abd->rc.bottom-1;
 213         abd->uEdge = ABE_BOTTOM;
 214         return TRUE;
 215     case ABM_ACTIVATE:
 216         return TRUE;
 217     case ABM_GETAUTOHIDEBAR:
 218         WINE_FIXME("SHAppBarMessage(ABM_GETAUTOHIDEBAR, hwnd=%p, edge=%x): stub\n", hwnd, abd->uEdge);
 219         return 0;
 220     case ABM_SETAUTOHIDEBAR:
 221         WINE_FIXME("SHAppBarMessage(ABM_SETAUTOHIDEBAR, hwnd=%p, edge=%x, lparam=%s): stub\n",
 222                    hwnd, abd->uEdge, wine_dbgstr_longlong(abd->lParam));
 223         return TRUE;
 224     case ABM_WINDOWPOSCHANGED:
 225         return TRUE;
 226     default:
 227         WINE_FIXME("SHAppBarMessage(%x) unimplemented\n", msg);
 228         return FALSE;
 229     }
 230 }
 231
 232 static LRESULT CALLBACK appbar_wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
 233 {
 234     switch (msg)
 235     {
 236     case WM_COPYDATA:
 237         {
 238             COPYDATASTRUCT* cds;
 239             struct appbar_cmd cmd;
 240             UINT_PTR result;
 241             HANDLE return_hproc;
 242             HANDLE return_map;
 243             LPVOID return_view;
 244             struct appbar_response* response;
 245
 246             cds = (COPYDATASTRUCT*)lparam;
 247             if (cds->cbData != sizeof(struct appbar_cmd))
 248                 return TRUE;
 249             CopyMemory(&cmd, cds->lpData, cds->cbData);
 250
 251             result = handle_appbarmessage(cds->dwData, &cmd.abd);
 252
 253             return_hproc = OpenProcess(PROCESS_DUP_HANDLE, FALSE, cmd.return_process);
 254             if (return_hproc == NULL)
 255             {
 256                 WINE_ERR("couldn't open calling process\n");
 257                 return TRUE;
 258             }
 259
 260             if (!DuplicateHandle(return_hproc, UlongToHandle(cmd.return_map),
 261                                  GetCurrentProcess(), &return_map, 0, FALSE, DUPLICATE_SAME_ACCESS))
 262             {
 263                 WINE_ERR("couldn't duplicate handle\n");
 264                 CloseHandle(return_hproc);
 265                 return TRUE;
 266             }
 267             CloseHandle(return_hproc);
 268
 269             return_view = MapViewOfFile(return_map, FILE_MAP_WRITE, 0, 0, sizeof(struct appbar_response));
 270
 271             if (return_view)
 272             {
 273                 response = (struct appbar_response*)return_view;
 274                 response->result = result;
 275                 response->abd = cmd.abd;
 276
 277                 UnmapViewOfFile(return_view);
 278             }
 279             else
 280                 WINE_ERR("couldn't map view of file\n");
 281
 282             CloseHandle(return_map);
 283             return TRUE;
 284         }
 285     default:
 286         break;
 287     }
 288
 289     return DefWindowProcW(hwnd, msg, wparam, lparam);
 290 }
 291
 292 void initialize_appbar(void)
 293 {
 294     WNDCLASSEXW class;
 295     static const WCHAR classname[] = {'W','i','n','e','A','p','p','B','a','r',0};
 296
 297     /* register the appbar window class */
 298     ZeroMemory(&class, sizeof(class));
 299     class.cbSize = sizeof(class);
 300     class.lpfnWndProc = appbar_wndproc;
 301     class.hInstance = NULL;
 302     class.lpszClassName = classname;
 303
 304     if (!RegisterClassExW(&class))
 305     {
 306         WINE_ERR("Could not register appbar message window class\n");
 307         return;
 308     }
 309
 310     appbarmsg_window = CreateWindowW(classname, classname, 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL);
 311     if (!appbarmsg_window)
 312     {
 313         WINE_ERR("Could not create appbar message window\n");
 314         return;
 315     }
 316 }