Last updated: 18. 1.1998, 11: 4
<* +M2EXTENSIONS *> (*-------------------------------------- TYPER.C --- Typing Program (c) Charles Petzold, 1996 Typer.mod --- Translation to XDS Modula-2 (c) Peter Stadler, 1997 --------------------------------------*) MODULE Typer; IMPORT SYSTEM; IMPORT Windows; IMPORT Storage; CONST szAppName = "Typer"; VAR hwnd : Windows.HWND; msg : Windows.MSG; wc : Windows.WNDCLASSEX; (* #define BUFFER(x,y) *(pBuffer + y * cxBuffer + x) *) TYPE BUFFER = ARRAY[0..10000] OF CHAR; VAR Buffer : BUFFER; pBuffer : POINTER TO BUFFER; cxChar : INTEGER; cyChar : INTEGER; cxClient: INTEGER; cyClient: INTEGER; cxBuffer: INTEGER; cyBuffer: INTEGER; xCaret : INTEGER; yCaret : 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; (*++++*****************************************************************) PROCEDURE BUFFEROut (x,y : INTEGER) : CHAR; (**********************************************************************) (* #define BUFFER(x,y) *(pBuffer + y * cxBuffer + x) *) VAR ch : CHAR; BEGIN ch := Buffer[y*cxBuffer+x]; RETURN ch; END BUFFEROut; (*++++*****************************************************************) PROCEDURE BUFFERIn (x,y : INTEGER; ch : CHAR); (**********************************************************************) BEGIN Buffer[y*cxBuffer+x] := ch; END BUFFERIn; (*++++*****************************************************************) PROCEDURE [Windows.CALLBACK] WndProc (hwnd : Windows.HWND; iMsg : Windows.UINT; wParam : Windows.WPARAM; lParam : Windows.LPARAM) : Windows.LRESULT; (**********************************************************************) VAR hdc : Windows.HDC; x : INTEGER; y : INTEGER; i : INTEGER; ps : Windows.PAINTSTRUCT; tm : Windows.TEXTMETRIC; ch2 : ARRAY[0..1] OF CHAR; BEGIN CASE (iMsg) OF | Windows.WM_CREATE : hdc := Windows.GetDC (hwnd); Windows.SelectObject (hdc, Windows.GetStockObject (Windows.SYSTEM_FIXED_FONT)); Windows.GetTextMetrics (hdc, tm); cxChar := tm.tmAveCharWidth; cyChar := tm.tmHeight; Windows.ReleaseDC (hwnd, hdc); RETURN 0; | Windows.WM_SIZE : (* obtain window size in pixels *) cxClient := Windows.LOWORD (lParam); cyClient := Windows.HIWORD (lParam); (* calculate window size in characters *) cxBuffer := MaxInt (1, cxClient DIV cxChar); cyBuffer := MaxInt (1, cyClient DIV cyChar); (* allocate memory for buffer and clear it *) IF (pBuffer # NIL) THEN Storage.DEALLOCATE(pBuffer,10000); END; Storage.ALLOCATE(pBuffer,10000); (* IF ((pBuffer := (char * ) malloc (cxBuffer * cyBuffer)) = NIL) THEN MessageBox (hwnd, "Window too large. Cannot " "allocate enough memory.", "Typer", MB_ICONEXCLAMATION + MB_OK); ELSE *) FOR y := 0 TO cyBuffer-1 DO FOR x := 0 TO cxBuffer-1 DO BUFFERIn (x,y,' '); END; END; (* END; *) (* set caret to upper left corner *) xCaret := 0; yCaret := 0; IF (hwnd = Windows.GetFocus ()) THEN Windows.SetCaretPos (xCaret * cxChar, yCaret * cyChar); END; RETURN 0; | Windows.WM_SETFOCUS : (* create and show the caret *) Windows.CreateCaret (hwnd, NIL, cxChar, cyChar); Windows.SetCaretPos (xCaret * cxChar, yCaret * cyChar); Windows.ShowCaret (hwnd); RETURN 0; | Windows.WM_KILLFOCUS : (* hide and destroy the caret *) Windows.HideCaret (hwnd); Windows.DestroyCaret (); RETURN 0; | Windows.WM_KEYDOWN : CASE (wParam) OF | Windows.VK_HOME : xCaret := 0; | Windows.VK_END : xCaret := cxBuffer - 1; | Windows.VK_PRIOR : yCaret := 0; | Windows.VK_NEXT : yCaret := cyBuffer - 1; | Windows.VK_LEFT : xCaret := MaxInt (xCaret - 1, 0); | Windows.VK_RIGHT : xCaret := MinInt (xCaret + 1, cxBuffer - 1); | Windows.VK_UP : yCaret := MaxInt (yCaret - 1, 0); | Windows.VK_DOWN : yCaret := MinInt (yCaret + 1, cyBuffer - 1); | Windows.VK_DELETE : FOR x := xCaret TO cxBuffer - 2 DO BUFFERIn (x, yCaret,BUFFEROut (x + 1, yCaret)); END; BUFFERIn (cxBuffer - 1, yCaret, ' '); Windows.HideCaret (hwnd); hdc := Windows.GetDC (hwnd); Windows.SelectObject (hdc, Windows.GetStockObject (Windows.SYSTEM_FIXED_FONT)); ch2[0] := BUFFEROut (xCaret, yCaret); Windows.TextOut (hdc, xCaret * cxChar, yCaret * cyChar, ch2, cxBuffer - xCaret); Windows.ShowCaret (hwnd); Windows.ReleaseDC (hwnd, hdc); ELSE END; Windows.SetCaretPos (xCaret * cxChar, yCaret * cyChar); RETURN 0; | Windows.WM_CHAR : FOR i := 0 TO VAL(INTEGER,Windows.LOWORD (lParam))-1 DO CASE (wParam) OF | 8 : (* backspace *) IF (xCaret > 0) THEN DEC(xCaret); Windows.SendMessage (hwnd, Windows.WM_KEYDOWN, Windows.VK_DELETE, 1h); END; | 9 : (* tab *) REPEAT Windows.SendMessage (hwnd, Windows.WM_CHAR, 0, 1h); UNTIL (xCaret MOD 8 = 0); | 10 : (* line feed *) INC(yCaret); IF (yCaret = cyBuffer) THEN yCaret := 0; END; | 13 : (* carriage RETURN *) xCaret := 0; INC(yCaret); IF (yCaret = cyBuffer) THEN yCaret := 0; END; | 27 : (* escape *) FOR y := 0 TO cyBuffer-1 DO FOR x := 0 TO cxBuffer-1 DO BUFFERIn (x, y,' '); END; END; xCaret := 0; yCaret := 0; Windows.InvalidateRect (hwnd, NIL, FALSE); ELSE (* character codes *) BUFFERIn (xCaret, yCaret, SYSTEM.CAST(CHAR,wParam)); Windows.HideCaret (hwnd); hdc := Windows.GetDC (hwnd); Windows.SelectObject (hdc, Windows.GetStockObject (Windows.SYSTEM_FIXED_FONT)); ch2[0] := BUFFEROut (xCaret, yCaret); Windows.TextOut (hdc, xCaret * cxChar, yCaret * cyChar, ch2, 1); Windows.ShowCaret (hwnd); Windows.ReleaseDC (hwnd, hdc); INC(xCaret); IF (xCaret = cxBuffer) THEN xCaret := 0; INC(yCaret); IF (yCaret = cyBuffer) THEN yCaret := 0; END; END; END; END; Windows.SetCaretPos (xCaret * cxChar, yCaret * cyChar); RETURN 0; | Windows.WM_PAINT : hdc := Windows.BeginPaint (hwnd, ps); Windows.SelectObject (hdc, Windows.GetStockObject (Windows.SYSTEM_FIXED_FONT)); FOR y := 0 TO cyBuffer-1 DO FOR x := 0 TO cxBuffer-1 DO ch2[0] := BUFFEROut (xCaret, yCaret); Windows.TextOut (hdc, x, y * cyChar, ch2, 1); END; END; Windows.EndPaint (hwnd, ps); RETURN 0; | Windows.WM_DESTROY : Windows.PostQuitMessage (0); RETURN 0; ELSE RETURN Windows.DefWindowProc (hwnd, iMsg, wParam, lParam); END; END WndProc; (*++++*****************************************************************) PROCEDURE InitApplication () : BOOLEAN; (**********************************************************************) VAR rc : CARDINAL; BEGIN wc.cbSize := SIZE(Windows.WNDCLASSEX); wc.style := Windows.CS_HREDRAW + Windows.CS_VREDRAW; wc.lpfnWndProc := WndProc; wc.cbClsExtra := 0; wc.cbWndExtra := 0; wc.hInstance := Windows.MyInstance(); wc.hIcon := Windows.LoadIcon (NIL, Windows.IDI_APPLICATION); wc.hCursor := Windows.LoadCursor (NIL, Windows.IDC_ARROW); wc.hbrBackground := SYSTEM.CAST(Windows.HBRUSH, Windows.GetStockObject (Windows.WHITE_BRUSH)); wc.lpszMenuName := NIL; wc.lpszClassName := SYSTEM.ADR(szAppName); wc.hIconSm := Windows.LoadIcon (NIL, Windows.IDI_APPLICATION); rc := Windows.RegisterClassEx (wc); RETURN rc#0; END InitApplication; (*++++*****************************************************************) PROCEDURE InitMainWindow () : BOOLEAN; (**********************************************************************) BEGIN hwnd := Windows.CreateWindow (szAppName, (* window class name *) "Typing Program: Translation to XDS Modula-2", (* window caption *) Windows.WS_OVERLAPPEDWINDOW, (* window style *) Windows.CW_USEDEFAULT, (* initial x position *) Windows.CW_USEDEFAULT, (* initial y position *) Windows.CW_USEDEFAULT, (* initial x size *) Windows.CW_USEDEFAULT, (* initial y size *) NIL, (* parent window handle *) NIL, (* window menu handle *) Windows.MyInstance(), (* program instance handle *) NIL); (* creation parameters *) IF hwnd = NIL THEN RETURN FALSE; END; Windows.ShowWindow (hwnd, Windows.SW_SHOWDEFAULT); Windows.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; (*++++*****************************************************************) BEGIN pBuffer := NIL; IF InitApplication() AND InitMainWindow() THEN WHILE (Windows.GetMessage(msg,NIL,0,0)) DO Windows.TranslateMessage(msg); Windows.DispatchMessage(msg); END; END; END Typer.