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C/C++ Source or Header  |  1989-02-20  |  9.4 KB  |  258 lines
  1. /*--------------------------------------------
  2.    SYSVALS.C -- System Values Display Program
  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 [] = "SysVals" ;
  17.      static ULONG flFrameFlags = FCF_TITLEBAR      | FCF_SYSMENU  |
  18.                                  FCF_SIZEBORDER    | FCF_MINMAX   |
  19.                                  FCF_SHELLPOSITION | FCF_TASKLIST |
  20.                                  FCF_VERTSCROLL    | FCF_HORZSCROLL ;
  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. LONG RtJustCharStringAt (HPS hps, POINTL *pptl, LONG lLength, CHAR *pchText)
  49.      {
  50.      POINTL aptlTextBox[TXTBOX_COUNT] ;
  51.  
  52.      GpiQueryTextBox (hps, lLength, pchText, TXTBOX_COUNT, aptlTextBox) ;
  53.  
  54.      pptl->x -= aptlTextBox[TXTBOX_CONCAT].x ;
  55.  
  56.      return GpiCharStringAt (hps, pptl, lLength, pchText) ;
  57.      }
  58.  
  59. MRESULT EXPENTRY ClientWndProc (HWND hwnd, USHORT msg, MPARAM mp1, MPARAM mp2)
  60.      {
  61.      static HWND  hwndHscroll, hwndVscroll ;
  62.      static SHORT sHscrollMax, sVscrollMax, sHscrollPos, sVscrollPos,
  63.                   cxChar, cxCaps, cyChar, cyDesc, cxClient, cyClient,
  64.                   cxTextTotal ;
  65.      CHAR         szBuffer [10] ;
  66.      FONTMETRICS  fm ;
  67.      HPS          hps ;
  68.      POINTL       ptl ;
  69.      SHORT        sLine, sPaintBeg, sPaintEnd, sHscrollInc, sVscrollInc ;
  70.      RECTL        rclInvalid ;
  71.  
  72.      switch (msg)
  73.           {
  74.           case WM_CREATE:
  75.                hps = WinGetPS (hwnd) ;
  76.      
  77.                GpiQueryFontMetrics (hps, (LONG) sizeof fm, &fm) ;
  78.  
  79.                cxChar = (SHORT) fm.lAveCharWidth ;
  80.                cxCaps = (SHORT) fm.lEmInc ;
  81.                cyChar = (SHORT) fm.lMaxBaselineExt ;
  82.                cyDesc = (SHORT) fm.lMaxDescender ;
  83.  
  84.                WinReleasePS (hps) ;
  85.  
  86.                cxTextTotal = 28 * cxCaps + 38 * cxChar ;
  87.  
  88.                hwndHscroll = WinWindowFromID (
  89.                                    WinQueryWindow (hwnd, QW_PARENT, FALSE),
  90.                                    FID_HORZSCROLL) ;
  91.  
  92.                hwndVscroll = WinWindowFromID (
  93.                                    WinQueryWindow (hwnd, QW_PARENT, FALSE),
  94.                                    FID_VERTSCROLL) ;
  95.                return 0 ;
  96.  
  97.           case WM_SIZE:
  98.                cxClient = SHORT1FROMMP (mp2) ;
  99.                cyClient = SHORT2FROMMP (mp2) ;
  100.  
  101.                sHscrollMax = max (0, cxTextTotal - cxClient) ;
  102.                sHscrollPos = min (sHscrollPos, sHscrollMax) ;
  103.  
  104.                WinSendMsg (hwndHscroll, SBM_SETSCROLLBAR,
  105.                                         MPFROM2SHORT (sHscrollPos, 0),
  106.                                         MPFROM2SHORT (0, sHscrollMax)) ;
  107.  
  108.                WinEnableWindow (hwndHscroll, sHscrollMax ? TRUE : FALSE) ;
  109.  
  110.                sVscrollMax = max (0, NUMLINES - cyClient / cyChar) ;
  111.                sVscrollPos = min (sVscrollPos, sVscrollMax) ;
  112.  
  113.                WinSendMsg (hwndVscroll, SBM_SETSCROLLBAR,
  114.                                         MPFROM2SHORT (sVscrollPos, 0),
  115.                                         MPFROM2SHORT (0, sVscrollMax)) ;
  116.  
  117.                WinEnableWindow (hwndVscroll, sVscrollMax ? TRUE : FALSE) ;
  118.                return 0 ;
  119.  
  120.           case WM_HSCROLL:
  121.                switch (SHORT2FROMMP (mp2))
  122.                     {
  123.                     case SB_LINELEFT:
  124.                          sHscrollInc = -cxCaps ;
  125.                          break ;
  126.  
  127.                     case SB_LINERIGHT:
  128.                          sHscrollInc = cxCaps ;
  129.                          break ;
  130.  
  131.                     case SB_PAGELEFT:
  132.                          sHscrollInc = -8 * cxCaps ;
  133.                          break ;
  134.  
  135.                     case SB_PAGERIGHT:
  136.                          sHscrollInc = 8 * cxCaps ;
  137.                          break ;
  138.  
  139.                     case SB_SLIDERPOSITION:
  140.                          sHscrollInc = SHORT1FROMMP (mp2) - sHscrollPos;
  141.                          break ;
  142.  
  143.                     default:
  144.                          sHscrollInc = 0 ;
  145.                          break ;
  146.                     }
  147.  
  148.                sHscrollInc = max (-sHscrollPos,
  149.                              min (sHscrollInc, sHscrollMax - sHscrollPos)) ;
  150.  
  151.                if (sHscrollInc != 0)
  152.                     {
  153.                     sHscrollPos += sHscrollInc ;
  154.                     WinScrollWindow (hwnd, -sHscrollInc, 0,
  155.                                    NULL, NULL, NULL, NULL, SW_INVALIDATERGN) ;
  156.  
  157.                     WinSendMsg (hwndHscroll, SBM_SETPOS,
  158.                                 MPFROMSHORT (sHscrollPos), NULL) ;
  159.                     }
  160.                return 0 ;
  161.  
  162.           case WM_VSCROLL:
  163.                switch (SHORT2FROMMP (mp2))
  164.                     {
  165.                     case SB_LINEUP:
  166.                          sVscrollInc = -1 ;
  167.                          break ;
  168.  
  169.                     case SB_LINEDOWN:
  170.                          sVscrollInc = 1 ;
  171.                          break ;
  172.  
  173.                     case SB_PAGEUP:
  174.                          sVscrollInc = min (-1, -cyClient / cyChar) ;
  175.                          break ;
  176.  
  177.                     case SB_PAGEDOWN:
  178.                          sVscrollInc = max (1, cyClient / cyChar) ;
  179.                          break ;
  180.  
  181.                     case SB_SLIDERTRACK:
  182.                          sVscrollInc = SHORT1FROMMP (mp2) - sVscrollPos;
  183.                          break ;
  184.  
  185.                     default:
  186.                          sVscrollInc = 0 ;
  187.                          break ;
  188.                     }
  189.  
  190.                sVscrollInc = max (-sVscrollPos,
  191.                              min (sVscrollInc, sVscrollMax - sVscrollPos)) ;
  192.  
  193.                if (sVscrollInc != 0) ;
  194.                     {
  195.                     sVscrollPos += sVscrollInc ;
  196.                     WinScrollWindow (hwnd, 0, cyChar * sVscrollInc,
  197.                                    NULL, NULL, NULL, NULL, SW_INVALIDATERGN) ;
  198.  
  199.                     WinSendMsg (hwndVscroll, SBM_SETPOS,
  200.                                 MPFROMSHORT (sVscrollPos), NULL) ;
  201.                     WinUpdateWindow (hwnd) ;
  202.                     }
  203.                return 0 ;
  204.  
  205.           case WM_CHAR:
  206.                switch (CHARMSG(&msg)->vkey)
  207.                     {
  208.                     case VK_LEFT:
  209.                     case VK_RIGHT:
  210.                          return WinSendMsg (hwndHscroll, msg, mp1, mp2) ;
  211.                     case VK_UP:
  212.                     case VK_DOWN:
  213.                     case VK_PAGEUP:
  214.                     case VK_PAGEDOWN:
  215.                          return WinSendMsg (hwndVscroll, msg, mp1, mp2) ;
  216.                     }
  217.                break ;
  218.  
  219.           case WM_PAINT:
  220.                hps = WinBeginPaint (hwnd, NULL, &rclInvalid) ;
  221.                GpiErase (hps) ;
  222.  
  223.                sPaintBeg = max (0, sVscrollPos +
  224.                               (cyClient - (SHORT) rclInvalid.yTop) / cyChar) ;
  225.                sPaintEnd = min (NUMLINES, sVscrollPos +
  226.                               (cyClient - (SHORT) rclInvalid.yBottom)
  227.                                    / cyChar + 1) ;
  228.  
  229.                for (sLine = sPaintBeg ; sLine < sPaintEnd ; sLine++)
  230.                     {
  231.                     ptl.x = cxCaps - sHscrollPos ;
  232.                     ptl.y = cyClient - cyChar * (sLine + 1 - sVscrollPos)
  233.                                      + cyDesc ;
  234.  
  235.                     GpiCharStringAt (hps, &ptl,
  236.                               (LONG) strlen (sysvals[sLine].szIdentifier),
  237.                               sysvals[sLine].szIdentifier) ;
  238.  
  239.                     ptl.x += 20 * cxCaps ;
  240.                     GpiCharStringAt (hps, &ptl,
  241.                               (LONG) strlen (sysvals[sLine].szDescription),
  242.                               sysvals[sLine].szDescription) ;
  243.  
  244.                     ltoa (WinQuerySysValue (HWND_DESKTOP,
  245.                                sysvals[sLine].sIndex), szBuffer, 10) ;
  246.  
  247.                     ptl.x += 38 * cxChar + 6 * cxCaps ;
  248.                     RtJustCharStringAt (hps, &ptl, (LONG) strlen (szBuffer),
  249.                                         szBuffer) ;
  250.                     }
  251.  
  252.                WinEndPaint (hps) ;
  253.                return 0 ;
  254.           }
  255.      return WinDefWindowProc (hwnd, msg, mp1, mp2) ;
  256.      }
  257. 
  258.