Last updated: 15. 2.1998, 11:33
<*/NOWARN:F*> (*----------------------------------------- BLOKOUT1.C -- Mouse Button Demo Program (c) Charles Petzold, 1996 BlokOut1.MOD -- Translation to Stony Brook Modula-2 (c) Peter Stadler, 1997 -----------------------------------------*) MODULE BlokOut1; IMPORT WINUSER; IMPORT WINX; IMPORT WINGDI; IMPORT WIN32; IMPORT SYSTEM; CONST szAppName = "BlokOut1"; VAR hwnd : WIN32.HWND; msg : WINUSER.MSG; wc : WINUSER.WNDCLASSEX; fBlocking : BOOLEAN; fValidBox : BOOLEAN; ptBeg : WIN32.POINT; ptEnd : WIN32.POINT; ptBoxBeg : WIN32.POINT; ptBoxEnd : WIN32.POINT; (*++++**********************************************************************) PROCEDURE DrawBoxOutline (hwnd : WIN32.HWND; ptBeg,ptEnd : WIN32.POINT); (***************************************************************************) VAR hdc : WIN32.HDC; BEGIN hdc := WINUSER.GetDC (hwnd); WINGDI.SetROP2 (hdc, WINGDI.R2_NOT); WINGDI.SelectObject (hdc, WINGDI.GetStockObject (0)); WINGDI.Rectangle (hdc, ptBeg.x, ptBeg.y, ptEnd.x, ptEnd.y); WINUSER.ReleaseDC (hwnd, hdc); END DrawBoxOutline; <*/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 hdc : WIN32.HDC; ps : WINUSER.PAINTSTRUCT; BEGIN CASE (iMsg) OF | WINUSER.WM_LBUTTONDOWN : ptBeg.x := WINUSER.LOWORD (lParam); ptEnd.x := WINUSER.LOWORD (lParam); ptBeg.y := WINUSER.HIWORD (lParam); ptEnd.y := WINUSER.HIWORD (lParam); DrawBoxOutline (hwnd, ptBeg, ptEnd); WINUSER.SetCursor (WINUSER.LoadCursor (NIL, WINUSER.IDC_CROSS^)); fBlocking := TRUE; RETURN 0; | WINUSER.WM_MOUSEMOVE : IF (fBlocking) THEN WINUSER.SetCursor (WINUSER.LoadCursor (NIL, WINUSER.IDC_CROSS^)); DrawBoxOutline (hwnd, ptBeg, ptEnd); ptEnd.x := WINUSER.LOWORD (lParam); ptEnd.y := WINUSER.HIWORD (lParam); DrawBoxOutline (hwnd, ptBeg, ptEnd); END; RETURN 0; | WINUSER.WM_LBUTTONUP : IF (fBlocking) THEN DrawBoxOutline (hwnd, ptBeg, ptEnd); ptBoxBeg := ptBeg; ptBoxEnd.x := WINUSER.LOWORD (lParam); ptBoxEnd.y := WINUSER.HIWORD (lParam); WINUSER.SetCursor (WINUSER.LoadCursor (NIL, WINUSER.IDC_ARROW^)); fBlocking := FALSE; fValidBox := TRUE; WINUSER.InvalidateRect (hwnd, WINX.NIL_RECT, TRUE); END; RETURN 0; | WINUSER.WM_CHAR : IF (VAL(WIN32.UINT,fBlocking) BAND wParam = 27) THEN (* ie, Escape *) DrawBoxOutline (hwnd, ptBeg, ptEnd); WINUSER.SetCursor (WINUSER.LoadCursor (NIL, WINUSER.IDC_ARROW^)); fBlocking := FALSE; END; RETURN 0; | WINUSER.WM_PAINT : hdc := WINUSER.BeginPaint (hwnd, ps); IF (fValidBox) THEN WINGDI.SelectObject (hdc, WINGDI.GetStockObject (WINGDI.BLACK_BRUSH)); WINGDI.Rectangle (hdc, ptBoxBeg.x, ptBoxBeg.y, ptBoxEnd.x, ptBoxEnd.y); END; IF (fBlocking) THEN WINGDI.SetROP2 (hdc, WINGDI.R2_NOT); WINGDI.SelectObject (hdc, WINGDI.GetStockObject (0)); WINGDI.Rectangle (hdc, ptBeg.x, ptBeg.y, ptEnd.x, ptEnd.y); END; WINUSER.EndPaint (hwnd, ps); RETURN 0; | WINUSER.WM_DESTROY : WINUSER.PostQuitMessage (0); RETURN 0; ELSE RETURN WINUSER.DefWindowProc (hwnd, iMsg, wParam, lParam); END; 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, "Mouse Button Demo: Translation to Stony Brook Modula-2", WINUSER.WS_OVERLAPPEDWINDOW, WINUSER.CW_USEDEFAULT, WINUSER.CW_USEDEFAULT, WINUSER.CW_USEDEFAULT, WINUSER.CW_USEDEFAULT, NIL, NIL, wc.hInstance, NIL); 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 BlokOut1.