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- /*--------------------------------------
- TYPER.C -- Typing Program
- (c) Charles Petzold, 1998
- --------------------------------------*/
-
- #include <windows.h>
-
- #define BUFFER(x,y) *(pBuffer + y * cxBuffer + x)
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static TCHAR szAppName[] = TEXT ("Typer") ;
- HWND hwnd ;
- MSG msg ;
- WNDCLASS wndclass ;
-
- wndclass.style = CS_HREDRAW | CS_VREDRAW ;
- wndclass.lpfnWndProc = WndProc ;
- wndclass.cbClsExtra = 0 ;
- wndclass.cbWndExtra = 0 ;
- wndclass.hInstance = hInstance ;
- wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
- wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
- wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
- wndclass.lpszMenuName = NULL ;
- wndclass.lpszClassName = szAppName ;
-
- if (!RegisterClass (&wndclass))
- {
- MessageBox (NULL, TEXT ("This program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- hwnd = CreateWindow (szAppName, TEXT ("Typing Program"),
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT, CW_USEDEFAULT,
- CW_USEDEFAULT, CW_USEDEFAULT,
- NULL, NULL, hInstance, NULL) ;
-
- ShowWindow (hwnd, iCmdShow) ;
- UpdateWindow (hwnd) ;
-
- while (GetMessage (&msg, NULL, 0, 0))
- {
- TranslateMessage (&msg) ;
- DispatchMessage (&msg) ;
- }
- return msg.wParam ;
- }
-
- LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static DWORD dwCharSet = DEFAULT_CHARSET ;
- static int cxChar, cyChar, cxClient, cyClient, cxBuffer, cyBuffer,
- xCaret, yCaret ;
- static TCHAR * pBuffer = NULL ;
- HDC hdc ;
- int x, y, i ;
- PAINTSTRUCT ps ;
- TEXTMETRIC tm ;
-
- switch (message)
- {
- case WM_INPUTLANGCHANGE:
- dwCharSet = wParam ;
- // fall through
- case WM_CREATE:
- hdc = GetDC (hwnd) ;
- SelectObject (hdc, CreateFont (0, 0, 0, 0, 0, 0, 0, 0,
- dwCharSet, 0, 0, 0, FIXED_PITCH, NULL)) ;
-
- GetTextMetrics (hdc, &tm) ;
- cxChar = tm.tmAveCharWidth ;
- cyChar = tm.tmHeight ;
-
- DeleteObject (SelectObject (hdc, GetStockObject (SYSTEM_FONT))) ;
- ReleaseDC (hwnd, hdc) ;
- // fall through
- case WM_SIZE:
- // obtain window size in pixels
-
- if (message == WM_SIZE)
- {
- cxClient = LOWORD (lParam) ;
- cyClient = HIWORD (lParam) ;
- }
- // calculate window size in characters
-
- cxBuffer = max (1, cxClient / cxChar) ;
- cyBuffer = max (1, cyClient / cyChar) ;
-
- // allocate memory for buffer and clear it
-
- if (pBuffer != NULL)
- free (pBuffer) ;
-
- pBuffer = (TCHAR *) malloc (cxBuffer * cyBuffer * sizeof (TCHAR)) ;
-
- for (y = 0 ; y < cyBuffer ; y++)
- for (x = 0 ; x < cxBuffer ; x++)
- BUFFER(x,y) = ' ' ;
-
- // set caret to upper left corner
-
- xCaret = 0 ;
- yCaret = 0 ;
-
- if (hwnd == GetFocus ())
- SetCaretPos (xCaret * cxChar, yCaret * cyChar) ;
-
- InvalidateRect (hwnd, NULL, TRUE) ;
- return 0 ;
-
- case WM_SETFOCUS:
- // create and show the caret
-
- CreateCaret (hwnd, NULL, cxChar, cyChar) ;
- SetCaretPos (xCaret * cxChar, yCaret * cyChar) ;
- ShowCaret (hwnd) ;
- return 0 ;
-
- case WM_KILLFOCUS:
- // hide and destroy the caret
-
- HideCaret (hwnd) ;
- DestroyCaret () ;
- return 0 ;
-
- case WM_KEYDOWN:
- switch (wParam)
- {
- case VK_HOME:
- xCaret = 0 ;
- break ;
-
- case VK_END:
- xCaret = cxBuffer - 1 ;
- break ;
-
- case VK_PRIOR:
- yCaret = 0 ;
- break ;
-
- case VK_NEXT:
- yCaret = cyBuffer - 1 ;
- break ;
-
- case VK_LEFT:
- xCaret = max (xCaret - 1, 0) ;
- break ;
-
- case VK_RIGHT:
- xCaret = min (xCaret + 1, cxBuffer - 1) ;
- break ;
-
- case VK_UP:
- yCaret = max (yCaret - 1, 0) ;
- break ;
-
- case VK_DOWN:
- yCaret = min (yCaret + 1, cyBuffer - 1) ;
- break ;
-
- case VK_DELETE:
- for (x = xCaret ; x < cxBuffer - 1 ; x++)
- BUFFER (x, yCaret) = BUFFER (x + 1, yCaret) ;
-
- BUFFER (cxBuffer - 1, yCaret) = ' ' ;
-
- HideCaret (hwnd) ;
- hdc = GetDC (hwnd) ;
-
- SelectObject (hdc, CreateFont (0, 0, 0, 0, 0, 0, 0, 0,
- dwCharSet, 0, 0, 0, FIXED_PITCH, NULL)) ;
-
- TextOut (hdc, xCaret * cxChar, yCaret * cyChar,
- & BUFFER (xCaret, yCaret),
- cxBuffer - xCaret) ;
-
- DeleteObject (SelectObject (hdc, GetStockObject (SYSTEM_FONT))) ;
- ReleaseDC (hwnd, hdc) ;
- ShowCaret (hwnd) ;
- break ;
- }
- SetCaretPos (xCaret * cxChar, yCaret * cyChar) ;
- return 0 ;
-
- case WM_CHAR:
- for (i = 0 ; i < (int) LOWORD (lParam) ; i++)
- {
- switch (wParam)
- {
- case '\b': // backspace
- if (xCaret > 0)
- {
- xCaret-- ;
- SendMessage (hwnd, WM_KEYDOWN, VK_DELETE, 1) ;
- }
- break ;
-
- case '\t': // tab
- do
- {
- SendMessage (hwnd, WM_CHAR, ' ', 1) ;
- }
- while (xCaret % 8 != 0) ;
- break ;
-
- case '\n': // line feed
- if (++yCaret == cyBuffer)
- yCaret = 0 ;
- break ;
-
- case '\r': // carriage return
- xCaret = 0 ;
-
- if (++yCaret == cyBuffer)
- yCaret = 0 ;
- break ;
-
- case '\x1B': // escape
- for (y = 0 ; y < cyBuffer ; y++)
- for (x = 0 ; x < cxBuffer ; x++)
- BUFFER (x, y) = ' ' ;
-
- xCaret = 0 ;
- yCaret = 0 ;
-
- InvalidateRect (hwnd, NULL, FALSE) ;
- break ;
-
- default: // character codes
- BUFFER (xCaret, yCaret) = (TCHAR) wParam ;
-
- HideCaret (hwnd) ;
- hdc = GetDC (hwnd) ;
-
- SelectObject (hdc, CreateFont (0, 0, 0, 0, 0, 0, 0, 0,
- dwCharSet, 0, 0, 0, FIXED_PITCH, NULL)) ;
-
- TextOut (hdc, xCaret * cxChar, yCaret * cyChar,
- & BUFFER (xCaret, yCaret), 1) ;
-
- DeleteObject (
- SelectObject (hdc, GetStockObject (SYSTEM_FONT))) ;
- ReleaseDC (hwnd, hdc) ;
- ShowCaret (hwnd) ;
-
- if (++xCaret == cxBuffer)
- {
- xCaret = 0 ;
-
- if (++yCaret == cyBuffer)
- yCaret = 0 ;
- }
- break ;
- }
- }
-
- SetCaretPos (xCaret * cxChar, yCaret * cyChar) ;
- return 0 ;
-
- case WM_PAINT:
- hdc = BeginPaint (hwnd, &ps) ;
-
- SelectObject (hdc, CreateFont (0, 0, 0, 0, 0, 0, 0, 0,
- dwCharSet, 0, 0, 0, FIXED_PITCH, NULL)) ;
-
- for (y = 0 ; y < cyBuffer ; y++)
- TextOut (hdc, 0, y * cyChar, & BUFFER(0,y), cxBuffer) ;
-
- DeleteObject (SelectObject (hdc, GetStockObject (SYSTEM_FONT))) ;
- EndPaint (hwnd, &ps) ;
- return 0 ;
-
- case WM_DESTROY:
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-