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  *      SetKeyboardState            [USER.223]
  47  */
  48 void SetKeyboardState(BYTE FAR *lpKeyState)
  49 {
  50     if (lpKeyState != NULL) {
  51         memcpy(KeyStateTable, lpKeyState, 256);
  52         MouseButtonsStates[0] = KeyStateTable[VK_LBUTTON];
  53         MouseButtonsStates[1] = KeyStateTable[VK_MBUTTON];
  54         MouseButtonsStates[2] = KeyStateTable[VK_RBUTTON];
  55     }
  56 }
  57
  58 /**********************************************************************
  59  *            GetAsyncKeyState        (USER.249)
  60  *
  61  *      Determine if a key is or was pressed.  retval has high-order
  62  * byte set to 1 if currently pressed, low-order byte 1 if key has
  63  * been pressed.
  64  *
  65  *      This uses the variable AsyncMouseButtonsStates and
  66  * AsyncKeyStateTable (set in event.c) which have the mouse button
  67  * number or key number (whichever is applicable) set to true if the
  68  * mouse or key had been depressed since the last call to
  69  * GetAsyncKeyState.
  70  */
  71 int GetAsyncKeyState(int nKey)
  72 {
  73     short retval;
  74
  75     switch (nKey) {
  76      case VK_LBUTTON:
  77         retval = AsyncMouseButtonsStates[0] |
  78         (MouseButtonsStates[0] << 8);
  79         break;
  80      case VK_MBUTTON:
  81         retval = AsyncMouseButtonsStates[1] |
  82         (MouseButtonsStates[1] << 8);
  83         break;
  84      case VK_RBUTTON:
  85         retval = AsyncMouseButtonsStates[2] |
  86         (MouseButtonsStates[2] << 8);
  87         break;
  88      default:
  89         retval = AsyncKeyStateTable[nKey] |
  90         (KeyStateTable[nKey] << 8);
  91         break;
  92     }
  93
  94     bzero(AsyncMouseButtonsStates, 3);  /* all states to false */
  95     bzero(AsyncKeyStateTable, 256);
  96
  97     return retval;
  98 }
  99