Last updated: 18. 1.1998, 11:15
<* +M2EXTENSIONS *> (*----------------------------------------- BLOKOUT1.C -- Mouse Button Demo Program (c) Charles Petzold, 1996 BlokOut1.MOD -- Translation to XDS Modula-2 (c) Peter Stadler, 1997 -----------------------------------------*) MODULE BlokOut1; IMPORT Windows; IMPORT SYSTEM; CONST szAppName = "BlokOut1"; VAR hwnd : Windows.HWND; msg : Windows.MSG; wc : Windows.WNDCLASSEX; fBlocking : BOOLEAN; fValidBox : BOOLEAN; ptBeg : Windows.POINT; ptEnd : Windows.POINT; ptBoxBeg : Windows.POINT; ptBoxEnd : Windows.POINT; (*++++**********************************************************************) PROCEDURE DrawBoxOutline (hwnd : Windows.HWND; ptBeg,ptEnd : Windows.POINT); (***************************************************************************) VAR hdc : Windows.HDC; BEGIN hdc := Windows.GetDC (hwnd); Windows.SetROP2 (hdc, Windows.R2_NOT); Windows.SelectObject (hdc, Windows.GetStockObject (SYSTEM.CAST(Windows.STOCK_ENUM,0))); Windows.Rectangle (hdc, ptBeg.x, ptBeg.y, ptEnd.x, ptEnd.y); Windows.ReleaseDC (hwnd, hdc); END DrawBoxOutline; (*++++**********************************************************************) PROCEDURE [Windows.CALLBACK] WndProc (hwnd : Windows.HWND; iMsg : Windows.UINT; wParam : Windows.WPARAM; lParam : Windows.LPARAM) : Windows.LRESULT; (***************************************************************************) VAR hdc : Windows.HDC; ps : Windows.PAINTSTRUCT; BEGIN CASE (iMsg) OF | Windows.WM_LBUTTONDOWN : ptBeg.x := Windows.LOWORD (lParam); ptEnd.x := Windows.LOWORD (lParam); ptBeg.y := Windows.HIWORD (lParam); ptEnd.y := Windows.HIWORD (lParam); DrawBoxOutline (hwnd, ptBeg, ptEnd); Windows.SetCursor (Windows.LoadCursor (NIL, Windows.IDC_CROSS)); fBlocking := TRUE; RETURN 0; | Windows.WM_MOUSEMOVE : IF (fBlocking) THEN Windows.SetCursor (Windows.LoadCursor (NIL, Windows.IDC_CROSS)); DrawBoxOutline (hwnd, ptBeg, ptEnd); ptEnd.x := Windows.LOWORD (lParam); ptEnd.y := Windows.HIWORD (lParam); DrawBoxOutline (hwnd, ptBeg, ptEnd); END; RETURN 0; | Windows.WM_LBUTTONUP : IF (fBlocking) THEN DrawBoxOutline (hwnd, ptBeg, ptEnd); ptBoxBeg := ptBeg; ptBoxEnd.x := Windows.LOWORD (lParam); ptBoxEnd.y := Windows.HIWORD (lParam); Windows.SetCursor (Windows.LoadCursor (NIL, Windows.IDC_ARROW)); fBlocking := FALSE; fValidBox := TRUE; Windows.InvalidateRect (hwnd, NIL, TRUE); END; RETURN 0; | Windows.WM_CHAR : IF (SYSTEM.CAST(Windows.UINT,fBlocking) - wParam = 27) THEN (* ie, Escape *) DrawBoxOutline (hwnd, ptBeg, ptEnd); Windows.SetCursor (Windows.LoadCursor (NIL, Windows.IDC_ARROW)); fBlocking := FALSE; END; RETURN 0; | Windows.WM_PAINT : hdc := Windows.BeginPaint (hwnd, ps); IF (fValidBox) THEN Windows.SelectObject (hdc, Windows.GetStockObject (Windows.BLACK_BRUSH)); Windows.Rectangle (hdc, ptBoxBeg.x, ptBoxBeg.y, ptBoxEnd.x, ptBoxEnd.y); END; IF (fBlocking) THEN Windows.SetROP2 (hdc, Windows.R2_NOT); Windows.SelectObject (hdc, Windows.GetStockObject (SYSTEM.CAST(Windows.STOCK_ENUM,0))); Windows.Rectangle (hdc, ptBeg.x, ptBeg.y, ptEnd.x, ptEnd.y); 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; (***************************************************************************) 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); RETURN Windows.RegisterClassEx(wc)#0; END InitApplication; (*+++***********************************************************************) PROCEDURE InitMainWindow () : BOOLEAN; (***************************************************************************) BEGIN hwnd := Windows.CreateWindow (szAppName, "Mouse Button Demo: Translation to XDS Modula-2", Windows.WS_OVERLAPPEDWINDOW, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, NIL, NIL, wc.hInstance, NIL); IF hwnd = NIL THEN RETURN FALSE; END; Windows.ShowWindow (hwnd, Windows.SW_SHOWDEFAULT); Windows.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; BEGIN IF InitApplication() AND InitMainWindow() THEN WHILE (Windows.GetMessage (msg, NIL, 0, 0)) DO Windows.TranslateMessage (msg); Windows.DispatchMessage (msg); END; END; END BlokOut1.