windows/keyboard.c

   1 /*
   2  * Keyboard related functions
   3  *
   4  * Copyright 1993 Bob Amstadt
   5  */
   6 #include <string.h>
   7 #include "win.h"
   8 #include "windows.h"
   9
  10 extern BOOL MouseButtonsStates[3];
  11 extern BOOL AsyncMouseButtonsStates[3];
  12 extern BYTE KeyStateTable[256];
  13 extern BYTE AsyncKeyStateTable[256];
  14
  15 /**********************************************************************
  16  *              GetKeyState                     [USER.106]
  17  */
  18 int GetKeyState(int keycode)
  19 {
  20         switch(keycode) {
  21                 case VK_LBUTTON:
  22                     return MouseButtonsStates[0];
  23                 case VK_MBUTTON:
  24                     return MouseButtonsStates[1];
  25                 case VK_RBUTTON:
  26                     return MouseButtonsStates[2];
  27                 default:
  28                     return KeyStateTable[keycode];
  29                 }
  30 }
  31
  32 /**********************************************************************
  33  *              GetKeyboardState                        [USER.222]
  34  */
  35 void GetKeyboardState(BYTE FAR *lpKeyState)
  36 {
  37     if (lpKeyState != NULL) {
  38         KeyStateTable[VK_LBUTTON] = MouseButtonsStates[0];
  39         KeyStateTable[VK_MBUTTON] = MouseButtonsStates[1];
  40         KeyStateTable[VK_RBUTTON] = MouseButtonsStates[2];
  41         memcpy(lpKeyState, KeyStateTable, 256);
  42     }
  43 }
  44
  45 /**********************************************************************
  46  *            GetAsyncKeyState        (USER.249)
  47  *
  48  *      Determine if a key is or was pressed.  retval has high-order
  49  * byte set to 1 if currently pressed, low-order byte 1 if key has
  50  * been pressed.
  51  *
  52  *      This uses the variable AsyncMouseButtonsStates and
  53  * AsyncKeyStateTable (set in event.c) which have the mouse button
  54  * number or key number (whichever is applicable) set to true if the
  55  * mouse or key had been depressed since the last call to
  56  * GetAsyncKeyState.
  57  */
  58 int GetAsyncKeyState(int nKey)
  59 {
  60         short   retval;
  61
  62         switch (nKey) {
  63
  64            case VK_LBUTTON:
  65                 retval = AsyncMouseButtonsStates[0] |
  66                               (MouseButtonsStates[0] << 8);
  67                 break;
  68            case VK_MBUTTON:
  69                 retval = AsyncMouseButtonsStates[1] |
  70                               (MouseButtonsStates[1] << 8);
  71                 break;
  72            case VK_RBUTTON:
  73                 retval = AsyncMouseButtonsStates[2] |
  74                               (MouseButtonsStates[2] << 8);
  75                 break;
  76            default:
  77                 retval = AsyncKeyStateTable[nKey] |
  78                               (KeyStateTable[nKey] << 8);
  79                 break;
  80         }
  81
  82         bzero(AsyncMouseButtonsStates, 3);      /* all states to false */
  83         bzero(AsyncKeyStateTable, 256);
  84
  85         return retval;
  86 }
  87