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C/C++ Source or Header  |  1989-01-09  |  5.4 KB  |  152 lines
  1. /*---------------------------------------------------
  2.    SYSVALS2.C -- System Values Display Program No. 2
  3.   ---------------------------------------------------*/
  4.  
  5. #define INCL_WIN
  6. #define INCL_GPI
  7. #include <os2.h>
  8. #include <stdlib.h>
  9. #include <string.h>
  10. #include "sysvals.h"
  11.  
  12. MRESULT EXPENTRY ClientWndProc (HWND, USHORT, MPARAM, MPARAM) ;
  13.  
  14. int main (void)
  15.      {
  16.      static CHAR  szClientClass [] = "SysVals2" ;
  17.      static ULONG flFrameFlags = FCF_TITLEBAR      | FCF_SYSMENU  |
  18.                                  FCF_SIZEBORDER    | FCF_MINMAX   |
  19.                                  FCF_SHELLPOSITION | FCF_TASKLIST |
  20.                                  FCF_VERTSCROLL ;
  21.      HAB          hab ;
  22.      HMQ          hmq ;
  23.      HWND         hwndFrame, hwndClient ;
  24.      QMSG         qmsg ;
  25.  
  26.      hab = WinInitialize (0) ;
  27.      hmq = WinCreateMsgQueue (hab, 0) ;
  28.  
  29.      WinRegisterClass (hab, szClientClass, ClientWndProc, CS_SIZEREDRAW, 0) ;
  30.  
  31.      hwndFrame = WinCreateStdWindow (HWND_DESKTOP, WS_VISIBLE,
  32.                                      &flFrameFlags, szClientClass, NULL,
  33.                                      0L, NULL, 0, &hwndClient) ;
  34.  
  35.      WinSendMsg (hwndFrame, WM_SETICON,
  36.                  WinQuerySysPointer (HWND_DESKTOP, SPTR_APPICON, FALSE),
  37.                  NULL) ;
  38.  
  39.      while (WinGetMsg (hab, &qmsg, NULL, 0, 0))
  40.           WinDispatchMsg (hab, &qmsg) ;
  41.  
  42.      WinDestroyWindow (hwndFrame) ;
  43.      WinDestroyMsgQueue (hmq) ;
  44.      WinTerminate (hab) ;
  45.      return 0 ;
  46.      }
  47.  
  48. MRESULT EXPENTRY ClientWndProc (HWND hwnd, USHORT msg, MPARAM mp1, MPARAM mp2)
  49.      {
  50.      static HWND  hwndVscroll ;
  51.      static SHORT cxChar, cxCaps, cyChar, cyDesc,
  52.                   sVscrollPos, cxClient, cyClient ;
  53.      CHAR         szBuffer [10] ;
  54.      FONTMETRICS  fm ;
  55.      HPS          hps ;
  56.      POINTL       ptl ;
  57.      SHORT        sLine ;
  58.  
  59.      switch (msg)
  60.           {
  61.           case WM_CREATE:
  62.                hps = WinGetPS (hwnd) ;
  63.                GpiQueryFontMetrics (hps, (LONG) sizeof fm, &fm) ;
  64.  
  65.                cxChar = (SHORT) fm.lAveCharWidth ;
  66.                cxCaps = (SHORT) fm.lEmInc ;
  67.                cyChar = (SHORT) fm.lMaxBaselineExt ;
  68.                cyDesc = (SHORT) fm.lMaxDescender ;
  69.  
  70.                WinReleasePS (hps) ;
  71.  
  72.                hwndVscroll = WinWindowFromID (
  73.                                    WinQueryWindow (hwnd, QW_PARENT, FALSE),
  74.                                    FID_VERTSCROLL) ;
  75.  
  76.                WinSendMsg (hwndVscroll, SBM_SETSCROLLBAR,
  77.                                    MPFROM2SHORT (sVscrollPos, 0),
  78.                                    MPFROM2SHORT (0, NUMLINES - 1)) ;
  79.                return 0 ;
  80.  
  81.           case WM_SIZE:
  82.                cxClient = SHORT1FROMMP (mp2) ;
  83.                cyClient = SHORT2FROMMP (mp2) ;
  84.                return 0 ;
  85.  
  86.           case WM_VSCROLL:
  87.                switch (SHORT2FROMMP (mp2))
  88.                     {
  89.                     case SB_LINEUP:
  90.                          sVscrollPos -= 1 ;
  91.                          break ;
  92.  
  93.                     case SB_LINEDOWN:
  94.                          sVscrollPos += 1 ;
  95.                          break ;
  96.  
  97.                     case SB_PAGEUP:
  98.                          sVscrollPos -= cyClient / cyChar ;
  99.                          break ;
  100.  
  101.                     case SB_PAGEDOWN:
  102.                          sVscrollPos += cyClient / cyChar ;
  103.                          break ;
  104.  
  105.                     case SB_SLIDERPOSITION:
  106.                          sVscrollPos = SHORT1FROMMP (mp2) ;
  107.                          break ;
  108.                     }
  109.                sVscrollPos = max (0, min (sVscrollPos, NUMLINES - 1)) ;
  110.  
  111.                if (sVscrollPos != SHORT1FROMMR (WinSendMsg (hwndVscroll,
  112.                                        SBM_QUERYPOS, NULL, NULL)))
  113.                     {
  114.                     WinSendMsg (hwndVscroll, SBM_SETPOS,
  115.                                 MPFROMSHORT (sVscrollPos), NULL) ;
  116.                     WinInvalidateRect (hwnd, NULL, FALSE) ;
  117.                     }
  118.                return 0 ;
  119.  
  120.           case WM_PAINT:
  121.                hps = WinBeginPaint (hwnd, NULL, NULL) ;
  122.                GpiErase (hps) ;
  123.  
  124.                for (sLine = 0 ; sLine < NUMLINES ; sLine++)
  125.                     {
  126.                     ptl.x = cxCaps ;
  127.                     ptl.y = cyClient - cyChar * (sLine + 1 - sVscrollPos)
  128.                                      + cyDesc ;
  129.  
  130.                     GpiCharStringAt (hps, &ptl,
  131.                               (LONG) strlen (sysvals[sLine].szIdentifier),
  132.                               sysvals[sLine].szIdentifier) ;
  133.  
  134.                     ptl.x += 20 * cxCaps ;
  135.                     GpiCharStringAt (hps, &ptl,
  136.                               (LONG) strlen (sysvals[sLine].szDescription),
  137.                               sysvals[sLine].szDescription) ;
  138.  
  139.                     ltoa (WinQuerySysValue (HWND_DESKTOP,
  140.                                sysvals[sLine].sIndex), szBuffer, 10) ;
  141.  
  142.                     ptl.x += 38 * cxChar ;
  143.                     GpiCharStringAt (hps, &ptl, (LONG) strlen (szBuffer),
  144.                                      szBuffer) ;
  145.                     }
  146.                WinEndPaint (hps) ;
  147.                return 0 ;
  148.           }
  149.      return WinDefWindowProc (hwnd, msg, mp1, mp2) ;
  150.      }
  151. 
  152.