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- /*-------------------------------------------------
- CHECKER4.C -- Mouse Hit-Test Demo Program No. 4
- (c) Charles Petzold, 1998
- -------------------------------------------------*/
-
- #include <windows.h>
-
- #define DIVISIONS 5
-
- LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
- LRESULT CALLBACK ChildWndProc (HWND, UINT, WPARAM, LPARAM) ;
-
- int idFocus = 0 ;
- TCHAR szChildClass[] = TEXT ("Checker4_Child") ;
-
- int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
- PSTR szCmdLine, int iCmdShow)
- {
- static TCHAR szAppName[] = TEXT ("Checker4") ;
- 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 ("Program requires Windows NT!"),
- szAppName, MB_ICONERROR) ;
- return 0 ;
- }
-
- wndclass.lpfnWndProc = ChildWndProc ;
- wndclass.cbWndExtra = sizeof (long) ;
- wndclass.hIcon = NULL ;
- wndclass.lpszClassName = szChildClass ;
-
- RegisterClass (&wndclass) ;
-
- hwnd = CreateWindow (szAppName, TEXT ("Checker4 Mouse Hit-Test Demo"),
- 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 HWND hwndChild[DIVISIONS][DIVISIONS] ;
- int cxBlock, cyBlock, x, y ;
-
- switch (message)
- {
- case WM_CREATE :
- for (x = 0 ; x < DIVISIONS ; x++)
- for (y = 0 ; y < DIVISIONS ; y++)
- hwndChild[x][y] = CreateWindow (szChildClass, NULL,
- WS_CHILDWINDOW | WS_VISIBLE,
- 0, 0, 0, 0,
- hwnd, (HMENU) (y << 8 | x),
- (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE),
- NULL) ;
- return 0 ;
-
- case WM_SIZE :
- cxBlock = LOWORD (lParam) / DIVISIONS ;
- cyBlock = HIWORD (lParam) / DIVISIONS ;
-
- for (x = 0 ; x < DIVISIONS ; x++)
- for (y = 0 ; y < DIVISIONS ; y++)
- MoveWindow (hwndChild[x][y],
- x * cxBlock, y * cyBlock,
- cxBlock, cyBlock, TRUE) ;
- return 0 ;
-
- case WM_LBUTTONDOWN :
- MessageBeep (0) ;
- return 0 ;
-
- // On set-focus message, set focus to child window
-
- case WM_SETFOCUS:
- SetFocus (GetDlgItem (hwnd, idFocus)) ;
- return 0 ;
-
- // On key-down message, possibly change the focus window
-
- case WM_KEYDOWN:
- x = idFocus & 0xFF ;
- y = idFocus >> 8 ;
-
- switch (wParam)
- {
- case VK_UP: y-- ; break ;
- case VK_DOWN: y++ ; break ;
- case VK_LEFT: x-- ; break ;
- case VK_RIGHT: x++ ; break ;
- case VK_HOME: x = y = 0 ; break ;
- case VK_END: x = y = DIVISIONS - 1 ; break ;
- default: return 0 ;
- }
-
- x = (x + DIVISIONS) % DIVISIONS ;
- y = (y + DIVISIONS) % DIVISIONS ;
-
- idFocus = y << 8 | x ;
-
- SetFocus (GetDlgItem (hwnd, idFocus)) ;
- return 0 ;
-
- case WM_DESTROY :
- PostQuitMessage (0) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-
- LRESULT CALLBACK ChildWndProc (HWND hwnd, UINT message,
- WPARAM wParam, LPARAM lParam)
- {
- HDC hdc ;
- PAINTSTRUCT ps ;
- RECT rect ;
-
- switch (message)
- {
- case WM_CREATE :
- SetWindowLong (hwnd, 0, 0) ; // on/off flag
- return 0 ;
-
- case WM_KEYDOWN:
- // Send most key presses to the parent window
-
- if (wParam != VK_RETURN && wParam != VK_SPACE)
- {
- SendMessage (GetParent (hwnd), message, wParam, lParam) ;
- return 0 ;
- }
- // For Return and Space, fall through to toggle the square
-
- case WM_LBUTTONDOWN :
- SetWindowLong (hwnd, 0, 1 ^ GetWindowLong (hwnd, 0)) ;
- SetFocus (hwnd) ;
- InvalidateRect (hwnd, NULL, FALSE) ;
- return 0 ;
-
- // For focus messages, invalidate the window for repaint
-
- case WM_SETFOCUS:
- idFocus = GetWindowLong (hwnd, GWL_ID) ;
-
- // Fall through
-
- case WM_KILLFOCUS:
- InvalidateRect (hwnd, NULL, TRUE) ;
- return 0 ;
-
- case WM_PAINT :
- hdc = BeginPaint (hwnd, &ps) ;
-
- GetClientRect (hwnd, &rect) ;
- Rectangle (hdc, 0, 0, rect.right, rect.bottom) ;
-
- // Draw the "x" mark
-
- if (GetWindowLong (hwnd, 0))
- {
- MoveToEx (hdc, 0, 0, NULL) ;
- LineTo (hdc, rect.right, rect.bottom) ;
- MoveToEx (hdc, 0, rect.bottom, NULL) ;
- LineTo (hdc, rect.right, 0) ;
- }
-
- // Draw the "focus" rectangle
-
- if (hwnd == GetFocus ())
- {
- rect.left += rect.right / 10 ;
- rect.right -= rect.left ;
- rect.top += rect.bottom / 10 ;
- rect.bottom -= rect.top ;
-
- SelectObject (hdc, GetStockObject (NULL_BRUSH)) ;
- SelectObject (hdc, CreatePen (PS_DASH, 0, 0)) ;
- Rectangle (hdc, rect.left, rect.top, rect.right, rect.bottom) ;
- DeleteObject (SelectObject (hdc, GetStockObject (BLACK_PEN))) ;
- }
-
- EndPaint (hwnd, &ps) ;
- return 0 ;
- }
- return DefWindowProc (hwnd, message, wParam, lParam) ;
- }
-