第七章 鼠标（CHECKER3）

 /*---------------------------------------------
 CHECKER3.C -- Mouse Hit-Test Demo Program No.3
               (c) Charles Petzold, 1998
 ---------------------------------------------*/

 #include <Windows.h>

 #define DIVISIONS 5

 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
 LRESULT CALLBACK ChildWndProc(HWND, UINT, WPARAM, LPARAM);

 TCHAR szChildClass[] = TEXT("Checker3_Child");

 int WINAPI WinMain( __in HINSTANCE hInstance
                     , __in_opt HINSTANCE hPrevInstance
                     , __in LPSTR lpCmdLine
                     , __in int nShowCmd )
 {
     static TCHAR szAppName[] = TEXT("Checker3");
     HWND hwnd;
     MSG msg;
     WNDCLASS wndclass;

     wndclass.style = CS_HREDRAW | CS_VREDRAW;
     wndclass.lpfnWndProc = WndProc;
     wndclass.cbClsExtra = ;
     wndclass.cbWndExtra = ;
     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 ;
     }

     wndclass.lpfnWndProc = ChildWndProc;
     wndclass.cbWndExtra = sizeof(long);
     wndclass.hIcon = NULL;
     wndclass.lpszClassName = szChildClass;

     RegisterClass(&wndclass);

     hwnd = CreateWindow(szAppName, TEXT("Checker3 Mouse Hit-Test Demo")
         , WS_OVERLAPPEDWINDOW
         , CW_USEDEFAULT, CW_USEDEFAULT
         , CW_USEDEFAULT, CW_USEDEFAULT
         , NULL, NULL, hInstance, NULL);

     ShowWindow(hwnd, nShowCmd);
     UpdateWindow(hwnd);

     while (GetMessage(&msg, NULL, , ))
     {
         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 = ; x != DIVISIONS; ++x)
             for (y = ; y != DIVISIONS; ++y)
             {
                 hwndChild[x][y] = CreateWindow(szChildClass, NULL
                     , WS_CHILDWINDOW | WS_VISIBLE
                     , , , ,
                     , hwnd, (HMENU)(y <<  | x)
                     , (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE)
                     , NULL);
             }
         return ;

     case WM_SIZE:
         cxBlock = LOWORD(lParam) / DIVISIONS;
         cyBlock = HIWORD(lParam) / DIVISIONS;

         for (x = ; x != DIVISIONS; ++x)
             for(y = ; y != DIVISIONS; ++y)
             {
                 MoveWindow(hwndChild[x][y]
                     , x * cxBlock, y * cyBlock
                     , cxBlock, cyBlock, TRUE);
             }
         return ;

     case WM_LBUTTONDOWN:
         MessageBeep();
         return ;

     case WM_DESTROY:
         PostQuitMessage();
         return ;
     }

     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, , );    // on/off flag
         return ;

     case WM_LBUTTONDOWN:
         SetWindowLong(hwnd, ,  ^ GetWindowLong(hwnd, ));
         InvalidateRect(hwnd, NULL, FALSE);
         return ;

     case WM_PAINT:
         hdc = BeginPaint(hwnd, &ps);

         GetClientRect(hwnd, &rect);
         Rectangle(hdc, , , rect.right, rect.bottom);

         if (GetWindowLong(hwnd, ))
         {
             MoveToEx(hdc, , , NULL);
             LineTo(hdc, rect.right, rect.bottom);
             MoveToEx(hdc, , rect.bottom, NULL);
             LineTo(hdc, rect.right, );
         }

         EndPaint(hwnd, &ps);
         return ;
     }

     return DefWindowProc(hwnd, message, wParam, lParam);
 }

CHECKER3.C