windows/sysmetrics.c

   1 /*
   2  * System metrics functions
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <stdarg.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <assert.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winreg.h"
  29 #include "wingdi.h"
  30 #include "winuser.h"
  31 #include "winerror.h"
  32 #include "user.h"
  33
  34 static int sysMetrics[SM_CMETRICS+1];
  35 static HDC display_dc;
  36
  37
  38 /***********************************************************************
  39  * RegistryTwips2Pixels
  40  *
  41  * Convert a a dimension value that was obtained from the registry.  These are
  42  * quoted as being "twips" values if negative and pixels if positive.
  43  * See for example
  44  *   MSDN Library - April 2001 -> Resource Kits ->
  45  *       Windows 2000 Resource Kit Reference ->
  46  *       Technical Reference to the Windows 2000 Registry ->
  47  *       HKEY_CURRENT_USER -> Control Panel -> Desktop -> WindowMetrics
  48  *
  49  * This is written as a function to prevent repeated evaluation of the
  50  * argument.
  51  */
  52 inline static int RegistryTwips2Pixels(int x)
  53 {
  54     if (x < 0)
  55         x = (-x+7)/15;
  56     return x;
  57 }
  58
  59
  60 /***********************************************************************
  61  * SYSMETRICS_GetRegistryMetric
  62  *
  63  * Get a registry entry from the already open key.  This allows us to open the
  64  * section once and read several values.
  65  *
  66  * Of course this function belongs somewhere more usable but here will do
  67  * for now.
  68  */
  69 static int SYSMETRICS_GetRegistryMetric (
  70         HKEY       hkey,            /* handle to the registry section */
  71         const char *key,            /* value name in the section */
  72         int        default_value)   /* default to return */
  73 {
  74     int value = default_value;
  75     if (hkey)
  76     {
  77         BYTE buffer[128];
  78         DWORD type, count = sizeof(buffer);
  79         if(!RegQueryValueExA (hkey, key, 0, &type, buffer, &count))
  80         {
  81             if (type != REG_SZ)
  82             {
  83                 /* Are there any utilities for converting registry entries
  84                  * between formats?
  85                  */
  86                 /* FIXME_(reg)("We need reg format converter\n"); */
  87             }
  88             else
  89                 value = atoi(buffer);
  90         }
  91     }
  92     return RegistryTwips2Pixels(value);
  93 }
  94
  95
  96 /***********************************************************************
  97  *           SYSMETRICS_Init
  98  *
  99  * Initialisation of the system metrics array.
 100  *
 101  * Differences in return values between 3.1 and 95 apps under Win95 (FIXME ?):
 102  * SM_CXVSCROLL        x+1      x       Fixed May 24, 1999 - Ronald B. Cemer
 103  * SM_CYHSCROLL        x+1      x       Fixed May 24, 1999 - Ronald B. Cemer
 104  * SM_CXDLGFRAME       x-1      x       Already fixed
 105  * SM_CYDLGFRAME       x-1      x       Already fixed
 106  * SM_CYCAPTION        x+1      x       Fixed May 24, 1999 - Ronald B. Cemer
 107  * SM_CYMENU           x-1      x       Already fixed
 108  * SM_CYFULLSCREEN     x-1      x
 109  * SM_CXFRAME                           Fixed July 6, 2001 - Bill Medland
 110  *
 111  * Starting at Win95 there are now a large number or Registry entries in the
 112  * [WindowMetrics] section that are probably relevant here.
 113  */
 114 void SYSMETRICS_Init(void)
 115 {
 116     HKEY hkey; /* key to the window metrics area of the registry */
 117     INT dummy;
 118
 119     display_dc = CreateICA( "DISPLAY", NULL, NULL, NULL );
 120     assert( display_dc );
 121
 122     if (RegOpenKeyExA (HKEY_CURRENT_USER, "Control Panel\\desktop\\WindowMetrics",
 123                        0, KEY_QUERY_VALUE, &hkey) != ERROR_SUCCESS) hkey = 0;
 124
 125     sysMetrics[SM_CXVSCROLL] = SYSMETRICS_GetRegistryMetric( hkey, "ScrollWidth", 16 );
 126     sysMetrics[SM_CYHSCROLL] = sysMetrics[SM_CXVSCROLL];
 127
 128     /* The Win 2000 resource kit SAYS that this is governed by the ScrollHeight
 129      * but on my computer that controls the CYV/CXH values. */
 130     sysMetrics[SM_CYCAPTION] = SYSMETRICS_GetRegistryMetric(hkey, "CaptionHeight", 18)
 131                                  + 1; /* for the separator? */
 132
 133     sysMetrics[SM_CYMENU] = SYSMETRICS_GetRegistryMetric (hkey, "MenuHeight", 18) + 1;
 134
 135
 136     sysMetrics[SM_CXDLGFRAME] = 3;
 137     sysMetrics[SM_CYDLGFRAME] = sysMetrics[SM_CXDLGFRAME];
 138
 139     /* force setting of SM_CXFRAME/SM_CYFRAME */
 140     SystemParametersInfoA( SPI_GETBORDER, 0, &dummy, 0 );
 141
 142     sysMetrics[SM_CXCURSOR] = 32;
 143     sysMetrics[SM_CYCURSOR] = 32;
 144     sysMetrics[SM_CXBORDER] = 1;
 145     sysMetrics[SM_CYBORDER] = sysMetrics[SM_CXBORDER];
 146     sysMetrics[SM_CYVTHUMB] = sysMetrics[SM_CXVSCROLL];
 147     sysMetrics[SM_CXHTHUMB] = sysMetrics[SM_CYVTHUMB];
 148     sysMetrics[SM_CXICON] = 32;
 149     sysMetrics[SM_CYICON] = 32;
 150     sysMetrics[SM_CYKANJIWINDOW] = 0;
 151     sysMetrics[SM_MOUSEPRESENT] = 1;
 152     sysMetrics[SM_CYVSCROLL] = SYSMETRICS_GetRegistryMetric (hkey, "ScrollHeight", sysMetrics[SM_CXVSCROLL]);
 153     sysMetrics[SM_CXHSCROLL] = SYSMETRICS_GetRegistryMetric (hkey, "ScrollHeight", sysMetrics[SM_CYHSCROLL]);
 154     sysMetrics[SM_DEBUG] = 0;
 155
 156     sysMetrics[SM_SWAPBUTTON] = 0;
 157     sysMetrics[SM_SWAPBUTTON] = SYSPARAMS_GetMouseButtonSwap();
 158
 159     sysMetrics[SM_RESERVED1] = 0;
 160     sysMetrics[SM_RESERVED2] = 0;
 161     sysMetrics[SM_RESERVED3] = 0;
 162     sysMetrics[SM_RESERVED4] = 0;
 163
 164     /* FIXME: The following two are calculated, but how? */
 165     sysMetrics[SM_CXMIN] = 112;
 166     sysMetrics[SM_CYMIN] = 27;
 167
 168     sysMetrics[SM_CXSIZE] = SYSMETRICS_GetRegistryMetric (hkey, "CaptionWidth", sysMetrics[SM_CYCAPTION] - 1);
 169     sysMetrics[SM_CYSIZE] = sysMetrics[SM_CYCAPTION] - 1;
 170     sysMetrics[SM_CXMINTRACK] = sysMetrics[SM_CXMIN];
 171     sysMetrics[SM_CYMINTRACK] = sysMetrics[SM_CYMIN];
 172
 173     sysMetrics[SM_CXDOUBLECLK] = 4;
 174     sysMetrics[SM_CYDOUBLECLK] = 4;
 175     SYSPARAMS_GetDoubleClickSize( &sysMetrics[SM_CXDOUBLECLK], &sysMetrics[SM_CYDOUBLECLK] );
 176
 177     sysMetrics[SM_CXICONSPACING] = 75;
 178     SystemParametersInfoA( SPI_ICONHORIZONTALSPACING, 0,
 179                            &sysMetrics[SM_CXICONSPACING], 0 );
 180     sysMetrics[SM_CYICONSPACING] = 75;
 181     SystemParametersInfoA( SPI_ICONVERTICALSPACING, 0,
 182                            &sysMetrics[SM_CYICONSPACING], 0 );
 183
 184     SystemParametersInfoA( SPI_GETMENUDROPALIGNMENT, 0,
 185                            &sysMetrics[SM_MENUDROPALIGNMENT], 0 );
 186     sysMetrics[SM_PENWINDOWS] = 0;
 187     sysMetrics[SM_DBCSENABLED] = 0;
 188
 189     /* FIXME: Need to query X for the following */
 190     sysMetrics[SM_CMOUSEBUTTONS] = 3;
 191
 192     sysMetrics[SM_SECURE] = 0;
 193     sysMetrics[SM_CXEDGE] = sysMetrics[SM_CXBORDER] + 1;
 194     sysMetrics[SM_CYEDGE] = sysMetrics[SM_CXEDGE];
 195     sysMetrics[SM_CXMINSPACING] = 160;
 196     sysMetrics[SM_CYMINSPACING] = 24;
 197     sysMetrics[SM_CXSMICON] = 16;
 198     sysMetrics[SM_CYSMICON] = 16;
 199     sysMetrics[SM_CYSMCAPTION] = SYSMETRICS_GetRegistryMetric(hkey, "SmCaptionHeight", 15) + 1;
 200     sysMetrics[SM_CXSMSIZE] = SYSMETRICS_GetRegistryMetric(hkey, "SmCaptionWidth", 13);
 201     sysMetrics[SM_CYSMSIZE] = sysMetrics[SM_CYSMCAPTION] - 1;
 202     sysMetrics[SM_CXMENUSIZE] = SYSMETRICS_GetRegistryMetric(hkey, "MenuWidth", sysMetrics[SM_CYMENU] - 1);
 203     sysMetrics[SM_CYMENUSIZE] = sysMetrics[SM_CYMENU] - 1;
 204
 205     /* FIXME: What do these mean? */
 206     sysMetrics[SM_ARRANGE] = ARW_HIDE;
 207     sysMetrics[SM_CXMINIMIZED] = 160;
 208     sysMetrics[SM_CYMINIMIZED] = 24;
 209
 210     /* FIXME: How do I calculate these? */
 211     sysMetrics[SM_NETWORK] = 3;
 212
 213     /* For the following: 0 = ok, 1 = failsafe, 2 = failsafe + network */
 214     sysMetrics[SM_CLEANBOOT] = 0;
 215
 216     sysMetrics[SM_CXDRAG] = 4;
 217     sysMetrics[SM_CYDRAG] = 4;
 218     sysMetrics[SM_CXMENUCHECK] = 13;
 219     sysMetrics[SM_CYMENUCHECK] = 13;
 220
 221     /* FIXME: Should check the type of processor for the following */
 222     sysMetrics[SM_SLOWMACHINE] = 0;
 223
 224     /* FIXME: Should perform a check */
 225     sysMetrics[SM_MIDEASTENABLED] = 0;
 226
 227     sysMetrics[SM_MOUSEWHEELPRESENT] = 1;
 228
 229     sysMetrics[SM_XVIRTUALSCREEN] = 0;
 230     sysMetrics[SM_YVIRTUALSCREEN] = 0;
 231     sysMetrics[SM_CMONITORS] = 1;
 232     sysMetrics[SM_SAMEDISPLAYFORMAT] = 1;
 233     sysMetrics[SM_CMETRICS] = SM_CMETRICS;
 234
 235     SystemParametersInfoA( SPI_GETSHOWSOUNDS, 0, &sysMetrics[SM_SHOWSOUNDS], 0 );
 236
 237     if (hkey) RegCloseKey (hkey);
 238 }
 239
 240
 241 /***********************************************************************
 242  *              SYSMETRICS_Set
 243  *
 244  *  Sets system metrics.
 245  */
 246 INT SYSMETRICS_Set( INT index, INT value )
 247 {
 248     if ((index < 0) || (index > SM_CMETRICS)) return 0;
 249     else
 250     {
 251         INT prev = sysMetrics[index];
 252         sysMetrics[index] = value;
 253         return prev;
 254     }
 255 }
 256
 257
 258 /***********************************************************************
 259  *              GetSystemMetrics (USER32.@)
 260  */
 261 INT WINAPI GetSystemMetrics( INT index )
 262 {
 263     /* some metrics are dynamic */
 264     switch (index)
 265     {
 266     case SM_CXSCREEN:
 267     case SM_CXFULLSCREEN:
 268     case SM_CXVIRTUALSCREEN:
 269         return GetDeviceCaps( display_dc, HORZRES );
 270     case SM_CYSCREEN:
 271     case SM_CYVIRTUALSCREEN:
 272         return GetDeviceCaps( display_dc, VERTRES );
 273     case SM_CYFULLSCREEN:
 274         return GetDeviceCaps( display_dc, VERTRES ) - sysMetrics[SM_CYCAPTION];
 275
 276     /* FIXME: How do I calculate these? */
 277     case SM_CXMAXTRACK:
 278         return GetDeviceCaps( display_dc, HORZRES ) + 4 + 2 * sysMetrics[SM_CXFRAME];
 279     case SM_CYMAXTRACK:
 280         return GetDeviceCaps( display_dc, VERTRES ) + 4 + 2 * sysMetrics[SM_CYFRAME];
 281     case SM_CXMAXIMIZED:
 282         return GetDeviceCaps( display_dc, HORZRES ) + 2 * sysMetrics[SM_CXFRAME];
 283     case SM_CYMAXIMIZED:
 284         return GetDeviceCaps( display_dc, VERTRES ) + 2 * sysMetrics[SM_CYFRAME];
 285
 286     default:
 287         if ((index < 0) || (index > SM_CMETRICS)) return 0;
 288         return sysMetrics[index];
 289     }
 290 }