dlls/user32/desktop.c

   1 /*
   2  * Desktop window class.
   3  *
   4  * Copyright 1994 Alexandre Julliard
   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
  21 #include <stdarg.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "wingdi.h"
  28 #include "winnls.h"
  29 #include "controls.h"
  30
  31 static HBRUSH hbrushPattern;
  32 static HBITMAP hbitmapWallPaper;
  33 static SIZE bitmapSize;
  34 static BOOL fTileWallPaper;
  35
  36
  37 /*********************************************************************
  38  * desktop class descriptor
  39  */
  40 const struct builtin_class_descr DESKTOP_builtin_class =
  41 {
  42     (LPCWSTR)DESKTOP_CLASS_ATOM, /* name */
  43     CS_DBLCLKS,           /* style */
  44     WINPROC_DESKTOP,      /* proc */
  45     0,                    /* extra */
  46     0,                    /* cursor */
  47     (HBRUSH)(COLOR_BACKGROUND+1)    /* brush */
  48 };
  49
  50
  51 /***********************************************************************
  52  *           DESKTOP_LoadBitmap
  53  */
  54 static HBITMAP DESKTOP_LoadBitmap( const WCHAR *filename )
  55 {
  56     HBITMAP hbitmap;
  57
  58     if (!filename[0]) return 0;
  59     hbitmap = LoadImageW( 0, filename, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE );
  60     if (!hbitmap)
  61     {
  62         WCHAR buffer[MAX_PATH];
  63         UINT len = GetWindowsDirectoryW( buffer, MAX_PATH - 2 );
  64         if (buffer[len - 1] != '\\') buffer[len++] = '\\';
  65         lstrcpynW( buffer + len, filename, MAX_PATH - len );
  66         hbitmap = LoadImageW( 0, buffer, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION | LR_LOADFROMFILE );
  67     }
  68     return hbitmap;
  69 }
  70
  71 /***********************************************************************
  72  *           init_wallpaper
  73  */
  74 static void init_wallpaper( const WCHAR *wallpaper )
  75 {
  76     HBITMAP hbitmap = DESKTOP_LoadBitmap( wallpaper );
  77
  78     if (hbitmapWallPaper) DeleteObject( hbitmapWallPaper );
  79     hbitmapWallPaper = hbitmap;
  80     if (hbitmap)
  81     {
  82         BITMAP bmp;
  83         GetObjectA( hbitmap, sizeof(bmp), &bmp );
  84         bitmapSize.cx = (bmp.bmWidth != 0) ? bmp.bmWidth : 1;
  85         bitmapSize.cy = (bmp.bmHeight != 0) ? bmp.bmHeight : 1;
  86         fTileWallPaper = GetProfileIntA( "desktop", "TileWallPaper", 0 );
  87     }
  88 }
  89
  90 /***********************************************************************
  91  *           DesktopWndProc
  92  */
  93 LRESULT WINAPI DesktopWndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
  94 {
  95     switch (message)
  96     {
  97     case WM_NCCREATE:
  98     {
  99         CREATESTRUCTW *cs = (CREATESTRUCTW *)lParam;
 100         const GUID *guid = cs->lpCreateParams;
 101
 102         if (guid)
 103         {
 104             ATOM atom;
 105             WCHAR buffer[37];
 106
 107             if (GetAncestor( hwnd, GA_PARENT )) return FALSE;  /* refuse to create non-desktop window */
 108
 109             swprintf( buffer, ARRAY_SIZE(buffer), L"%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
 110                       guid->Data1, guid->Data2, guid->Data3,
 111                       guid->Data4[0], guid->Data4[1], guid->Data4[2], guid->Data4[3],
 112                       guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7] );
 113             atom = GlobalAddAtomW( buffer );
 114             SetPropW( hwnd, L"__wine_display_device_guid", ULongToHandle( atom ) );
 115         }
 116         return TRUE;
 117     }
 118     case WM_NCCALCSIZE:
 119         return 0;
 120     default:
 121         return DefWindowProcW( hwnd, message, wParam, lParam );
 122     }
 123 }
 124
 125 /***********************************************************************
 126  *           PaintDesktop   (USER32.@)
 127  *
 128  */
 129 BOOL WINAPI PaintDesktop(HDC hdc)
 130 {
 131     HWND hwnd = GetDesktopWindow();
 132
 133     /* check for an owning thread; otherwise don't paint anything (non-desktop mode) */
 134     if (GetWindowThreadProcessId( hwnd, NULL ))
 135     {
 136         RECT rect;
 137
 138         GetClientRect( hwnd, &rect );
 139
 140         /* Paint desktop pattern (only if wall paper does not cover everything) */
 141
 142         if (!hbitmapWallPaper ||
 143             (!fTileWallPaper && ((bitmapSize.cx < rect.right) || (bitmapSize.cy < rect.bottom))))
 144         {
 145             HBRUSH brush = hbrushPattern;
 146             if (!brush) brush = (HBRUSH)GetClassLongPtrW( hwnd, GCLP_HBRBACKGROUND );
 147             /* Set colors in case pattern is a monochrome bitmap */
 148             SetBkColor( hdc, RGB(0,0,0) );
 149             SetTextColor( hdc, GetSysColor(COLOR_BACKGROUND) );
 150             FillRect( hdc, &rect, brush );
 151         }
 152
 153         /* Paint wall paper */
 154
 155         if (hbitmapWallPaper)
 156         {
 157             INT x, y;
 158             HDC hMemDC = CreateCompatibleDC( hdc );
 159
 160             SelectObject( hMemDC, hbitmapWallPaper );
 161
 162             if (fTileWallPaper)
 163             {
 164                 for (y = 0; y < rect.bottom; y += bitmapSize.cy)
 165                     for (x = 0; x < rect.right; x += bitmapSize.cx)
 166                         BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 167             }
 168             else
 169             {
 170                 x = (rect.left + rect.right - bitmapSize.cx) / 2;
 171                 y = (rect.top + rect.bottom - bitmapSize.cy) / 2;
 172                 if (x < 0) x = 0;
 173                 if (y < 0) y = 0;
 174                 BitBlt( hdc, x, y, bitmapSize.cx, bitmapSize.cy, hMemDC, 0, 0, SRCCOPY );
 175             }
 176             DeleteDC( hMemDC );
 177         }
 178     }
 179     return TRUE;
 180 }
 181
 182 /***********************************************************************
 183  *           SetDeskWallPaper   (USER32.@)
 184  *
 185  * FIXME: is there a unicode version?
 186  */
 187 BOOL WINAPI SetDeskWallPaper( LPCSTR filename )
 188 {
 189     return SystemParametersInfoA( SPI_SETDESKWALLPAPER, MAX_PATH, (void *)filename, SPIF_UPDATEINIFILE );
 190 }
 191
 192
 193 /***********************************************************************
 194  *           update_wallpaper
 195  */
 196 BOOL update_wallpaper( const WCHAR *wallpaper, const WCHAR *pattern )
 197 {
 198     int pat[8];
 199
 200     if (hbrushPattern) DeleteObject( hbrushPattern );
 201     hbrushPattern = 0;
 202     memset( pat, 0, sizeof(pat) );
 203     if (pattern)
 204     {
 205         char buffer[64];
 206         WideCharToMultiByte( CP_ACP, 0, pattern, -1, buffer, sizeof(buffer), NULL, NULL );
 207         if (sscanf( buffer, " %d %d %d %d %d %d %d %d",
 208                     &pat[0], &pat[1], &pat[2], &pat[3],
 209                     &pat[4], &pat[5], &pat[6], &pat[7] ))
 210         {
 211             WORD ptrn[8];
 212             HBITMAP hbitmap;
 213             int i;
 214
 215             for (i = 0; i < 8; i++) ptrn[i] = pat[i] & 0xffff;
 216             hbitmap = CreateBitmap( 8, 8, 1, 1, ptrn );
 217             hbrushPattern = CreatePatternBrush( hbitmap );
 218             DeleteObject( hbitmap );
 219         }
 220     }
 221     init_wallpaper( wallpaper );
 222     RedrawWindow( GetDesktopWindow(), 0, 0, RDW_INVALIDATE | RDW_ERASE | RDW_NOCHILDREN );
 223     return TRUE;
 224 }