Last updated: 18. 1.1998, 10:55
<*/NOWARN:F*> MODULE SysMets; (*---------------------------------------------------- SYSMETS.C --- System Metrics Display Program, Final (c) Charles Petzold, 1996 SysMets.mod --- Translation to Stony Brook Modula-2 (c) Peter Stadler, 1997 ----------------------------------------------------*) IMPORT SYSTEM; IMPORT WINUSER; IMPORT WIN32; IMPORT WINGDI; IMPORT SystemDef; IMPORT Strings; IMPORT WINX; CONST szAppName = "SysMets"; VAR hwnd : WIN32.HWND; msg : WINUSER.MSG; wc : WINUSER.WNDCLASSEX; cxChar, cxCaps, cyChar, cxClient, cyClient, iMaxWidth, iVscrollPos, iVscrollMax, iHscrollPos, iHscrollMax : INTEGER; (*++++*****************************************************************) PROCEDURE MaxInt (a,b : INTEGER) : INTEGER; (**********************************************************************) BEGIN IF(a>b) THEN RETURN a; ELSE RETURN b; END; END MaxInt; (*++++*****************************************************************) PROCEDURE MinInt (a,b : INTEGER) : INTEGER; (**********************************************************************) BEGIN IF(a>b) THEN RETURN b; ELSE RETURN a; END; END MinInt; <*/PUSH*> %IF WIN32 %THEN <*/CALLS:WIN32SYSTEM*> %ELSE <*/CALLS:WINSYSTEM*> %END (*++++*****************************************************************) PROCEDURE WndProc (hwnd : WIN32.HWND; iMsg : WIN32.UINT; wParam : WIN32.WPARAM; lParam : WIN32.LPARAM) : WIN32.LRESULT [EXPORT]; (**********************************************************************) VAR szBuffer : ARRAY[0..10] OF CHAR; hdc : WIN32.HDC; i, x, y, iPaintBeg, iPaintEnd, iVscrollInc, iHscrollInc : INTEGER; ps : WINUSER.PAINTSTRUCT; tm : WINGDI.TEXTMETRIC; BEGIN CASE (iMsg) OF | WINUSER.WM_CREATE : hdc := WINUSER.GetDC (hwnd); WINGDI.GetTextMetrics (hdc, tm); cxChar := tm.tmAveCharWidth; IF(tm.tmPitchAndFamily=1) THEN cxCaps := 3*cxChar/2; ELSE cxCaps := 2*cxChar/2; END; cyChar := tm.tmHeight + tm.tmExternalLeading; WINUSER.ReleaseDC (hwnd, hdc); iMaxWidth := 50 * cxChar + 30 * cxCaps; RETURN 0; | WINUSER.WM_SIZE : cxClient := WINUSER.LOWORD (lParam); cyClient := WINUSER.HIWORD (lParam); iVscrollMax := MaxInt (0, SystemDef.NUMLINES + 2 - cyClient DIV cyChar); iVscrollPos := MinInt (iVscrollPos, iVscrollMax); WINUSER.SetScrollRange (hwnd, WINUSER.SB_VERT, 0, iVscrollMax, FALSE); WINUSER.SetScrollPos (hwnd, WINUSER.SB_VERT, iVscrollPos, TRUE); iHscrollMax := MaxInt (0, 2 + (iMaxWidth - cxClient) DIV cxChar); iHscrollPos := MinInt (iHscrollPos, iHscrollMax); WINUSER.SetScrollRange (hwnd, WINUSER.SB_HORZ, 0, iHscrollMax, FALSE); WINUSER.SetScrollPos (hwnd, WINUSER.SB_HORZ, iHscrollPos, TRUE); RETURN 0; | WINUSER.WM_VSCROLL : CASE (WINUSER.LOWORD (wParam)) OF | WINUSER.SB_TOP : iVscrollInc := -iVscrollPos; | WINUSER.SB_BOTTOM : iVscrollInc := iVscrollMax - iVscrollPos; | WINUSER.SB_LINEUP : iVscrollInc := -1; | WINUSER.SB_LINEDOWN : iVscrollInc := 1; | WINUSER.SB_PAGEUP : iVscrollInc := MinInt (-1, -cyClient DIV cyChar); | WINUSER.SB_PAGEDOWN : iVscrollInc := MaxInt (1, cyClient DIV cyChar); | WINUSER.SB_THUMBTRACK : iVscrollInc := VAL(INTEGER,WINUSER.HIWORD (wParam)) - iVscrollPos; ELSE iVscrollInc := 0; END; iVscrollInc := MaxInt (-iVscrollPos, MinInt (iVscrollInc, iVscrollMax - iVscrollPos)); IF (iVscrollInc # 0) THEN iVscrollPos := iVscrollPos+iVscrollInc; WINUSER.ScrollWindow (hwnd, 0, -cyChar * iVscrollInc, WINX.NIL_RECT, WINX.NIL_RECT); WINUSER.SetScrollPos (hwnd, WINUSER.SB_VERT, iVscrollPos, TRUE); WINUSER.UpdateWindow (hwnd); END; RETURN 0; | WINUSER.WM_HSCROLL : CASE (WINUSER.LOWORD (wParam)) OF | WINUSER.SB_LINEUP : iHscrollInc := -1; | WINUSER.SB_LINEDOWN : iHscrollInc := 1; | WINUSER.SB_PAGEUP : iHscrollInc := -8; | WINUSER.SB_PAGEDOWN : iHscrollInc := 8; | WINUSER.SB_THUMBPOSITION : iHscrollInc := VAL(INTEGER,WINUSER.HIWORD (wParam)) - iHscrollPos; ELSE iHscrollInc := 0; END; iHscrollInc := MaxInt (-iHscrollPos, MinInt (iHscrollInc, iHscrollMax - iHscrollPos)); IF (iHscrollInc # 0) THEN iHscrollPos := iHscrollInc+ iHscrollInc; WINUSER.ScrollWindow (hwnd, -cxChar * iHscrollInc, 0, WINX.NIL_RECT, WINX.NIL_RECT); WINUSER.SetScrollPos (hwnd, WINUSER.SB_HORZ, iHscrollPos, TRUE); END; RETURN 0; | WINUSER.WM_KEYDOWN : CASE (wParam) OF | WINUSER.VK_HOME : WINUSER.SendMessage (hwnd, WINUSER.WM_VSCROLL, WINUSER.SB_TOP, 0h); | WINUSER.VK_END : WINUSER.SendMessage (hwnd, WINUSER.WM_VSCROLL, WINUSER.SB_BOTTOM, 0h); | WINUSER.VK_PRIOR : WINUSER.SendMessage (hwnd, WINUSER.WM_VSCROLL, WINUSER.SB_PAGEUP, 0h); | WINUSER.VK_NEXT : WINUSER.SendMessage (hwnd, WINUSER.WM_VSCROLL, WINUSER.SB_PAGEDOWN, 0h); | WINUSER.VK_UP : WINUSER.SendMessage (hwnd, WINUSER.WM_VSCROLL, WINUSER.SB_LINEUP, 0h); | WINUSER.VK_DOWN : WINUSER.SendMessage (hwnd, WINUSER.WM_VSCROLL, WINUSER.SB_LINEDOWN, 0h); | WINUSER.VK_LEFT : WINUSER.SendMessage (hwnd, WINUSER.WM_HSCROLL, WINUSER.SB_PAGEUP, 0h); | WINUSER.VK_RIGHT : WINUSER.SendMessage (hwnd, WINUSER.WM_HSCROLL, WINUSER.SB_PAGEDOWN, 0h); ELSE RETURN 0; END; | WINUSER.WM_PAINT : hdc := WINUSER.BeginPaint (hwnd, ps); iPaintBeg := MaxInt (0, iVscrollPos + ps.rcPaint.top DIV cyChar - 1); iPaintEnd := MinInt (SystemDef.NUMLINES, iVscrollPos + ps.rcPaint.bottom DIV cyChar); FOR i := iPaintBeg TO iPaintEnd-1 DO x := cxChar * (1 - iHscrollPos); y := cyChar * (1 - iVscrollPos + i); WINGDI.TextOut (hdc, x, y, SystemDef.sysmetrics[i].szLabel, LENGTH (SystemDef.sysmetrics[i].szLabel)); WINGDI.TextOut (hdc, x + 30 * cxCaps, y, SystemDef.sysmetrics[i].szDesc, LENGTH (SystemDef.sysmetrics[i].szDesc)); WINGDI.SetTextAlign (hdc, WINGDI.TA_RIGHT BOR WINGDI.TA_TOP); WINGDI.TextOut (hdc, x + 30 * cxCaps + 50 * cxChar, y, szBuffer, WINUSER.wsprintf (szBuffer, "%5d", WINUSER.GetSystemMetrics (SystemDef.sysmetrics[i].iIndex))); WINGDI.SetTextAlign (hdc, WINGDI.TA_LEFT BOR WINGDI.TA_TOP); END; WINUSER.EndPaint (hwnd, ps); RETURN 0; | WINUSER.WM_DESTROY : WINUSER.PostQuitMessage (0); RETURN 0; ELSE RETURN WINUSER.DefWindowProc (hwnd, iMsg, wParam, lParam); END; RETURN WINUSER.DefWindowProc (hwnd, iMsg, wParam, lParam); END WndProc; <*/POP*> (*++++*****************************************************************) PROCEDURE InitApplication () : BOOLEAN; (**********************************************************************) BEGIN wc.cbSize := SIZE(WINUSER.WNDCLASSEX); wc.style := WINUSER.CS_HREDRAW BOR WINUSER.CS_VREDRAW; wc.lpfnWndProc := WndProc; wc.cbClsExtra := 0; wc.cbWndExtra := 0; wc.hInstance := WINX.Instance; wc.hIcon := WINUSER.LoadIcon (NIL, WINUSER.IDI_APPLICATION^); wc.hCursor := WINUSER.LoadCursor (NIL, WINUSER.IDC_ARROW^); wc.hbrBackground := SYSTEM.CAST(WIN32.HBRUSH, WINGDI.GetStockObject (WINGDI.WHITE_BRUSH)); wc.lpszMenuName := NIL; wc.lpszClassName := SYSTEM.ADR(szAppName); wc.hIconSm := WINUSER.LoadIcon (NIL, WINUSER.IDI_APPLICATION^); RETURN WINUSER.RegisterClassEx (wc)#0; END InitApplication; (*++++*****************************************************************) PROCEDURE InitMainWindow () : BOOLEAN; (**********************************************************************) BEGIN hwnd := WINUSER.CreateWindow (szAppName, (* window class name *) "Get System Metrics (final): Translation to Stony Brook Modula-2", (* window caption *) WINUSER.WS_OVERLAPPEDWINDOW, (* window style *) WINUSER.CW_USEDEFAULT, (* initial x position *) WINUSER.CW_USEDEFAULT, (* initial y position *) WINUSER.CW_USEDEFAULT, (* initial x size *) WINUSER.CW_USEDEFAULT, (* initial y size *) NIL, (* parent window handle *) NIL, (* window menu handle *) WINX.Instance, (* program instance handle *) NIL); (* creation parameters *) IF hwnd = NIL THEN RETURN FALSE; END; WINUSER.ShowWindow (hwnd, WINUSER.SW_SHOWDEFAULT); WINUSER.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; (*++++*****************************************************************) BEGIN IF InitApplication() AND InitMainWindow() THEN WHILE (WINUSER.GetMessage(msg,NIL,0,0)) DO WINUSER.TranslateMessage(msg); WINUSER.DispatchMessage(msg); END; END; END SysMets.