windows/keyboard.c

   1 /*
   2  * Keyboard related functions
   3  *
   4  * Copyright 1993 Bob Amstadt
   5  */
   6
   7 static char Copyright[] = "Copyright  Bob Amstadt, 1993";
   8
   9 #include <string.h>
  10 #include "win.h"
  11 #include "windows.h"
  12
  13 extern BOOL MouseButtonsStates[3];
  14 extern BOOL AsyncMouseButtonsStates[3];
  15 extern BYTE KeyStateTable[256];
  16 extern BYTE AsyncKeyStateTable[256];
  17
  18 /**********************************************************************
  19  *              GetKeyState                     [USER.106]
  20  */
  21 int GetKeyState(int keycode)
  22 {
  23         switch(keycode) {
  24                 case VK_LBUTTON:
  25                     return MouseButtonsStates[0];
  26                 case VK_MBUTTON:
  27                     return MouseButtonsStates[1];
  28                 case VK_RBUTTON:
  29                     return MouseButtonsStates[2];
  30                 default:
  31                     return KeyStateTable[keycode];
  32                 }
  33 }
  34
  35 /**********************************************************************
  36  *              GetKeyboardState                        [USER.222]
  37  */
  38 void GetKeyboardState(BYTE FAR *lpKeyState)
  39 {
  40     if (lpKeyState != NULL) {
  41         KeyStateTable[VK_LBUTTON] = MouseButtonsStates[0];
  42         KeyStateTable[VK_MBUTTON] = MouseButtonsStates[1];
  43         KeyStateTable[VK_RBUTTON] = MouseButtonsStates[2];
  44         memcpy(lpKeyState, KeyStateTable, 256);
  45     }
  46 }
  47
  48 /**********************************************************************
  49  *            GetAsyncKeyState        (USER.249)
  50  *
  51  *      Determine if a key is or was pressed.  retval has high-order
  52  * byte set to 1 if currently pressed, low-order byte 1 if key has
  53  * been pressed.
  54  *
  55  *      This uses the variable AsyncMouseButtonsStates and
  56  * AsyncKeyStateTable (set in event.c) which have the mouse button
  57  * number or key number (whichever is applicable) set to true if the
  58  * mouse or key had been depressed since the last call to
  59  * GetAsyncKeyState.
  60  */
  61 int GetAsyncKeyState(int nKey)
  62 {
  63         short   retval;
  64
  65         switch (nKey) {
  66
  67            case VK_LBUTTON:
  68                 retval = AsyncMouseButtonsStates[0] |
  69                               (MouseButtonsStates[0] << 8);
  70                 break;
  71            case VK_MBUTTON:
  72                 retval = AsyncMouseButtonsStates[1] |
  73                               (MouseButtonsStates[1] << 8);
  74                 break;
  75            case VK_RBUTTON:
  76                 retval = AsyncMouseButtonsStates[2] |
  77                               (MouseButtonsStates[2] << 8);
  78                 break;
  79            default:
  80                 retval = AsyncKeyStateTable[nKey] |
  81                               (KeyStateTable[nKey] << 8);
  82                 break;
  83         }
  84
  85         bzero(AsyncMouseButtonsStates, 3);      /* all states to false */
  86         bzero(AsyncKeyStateTable, 256);
  87
  88         return retval;
  89 }
  90