1 /*---------------------------------------------
2 CHECKER3.C -- Mouse Hit-Test Demo Program No.3
3 (c) Charles Petzold, 1998
4 ---------------------------------------------*/
5
6 #include <Windows.h>
7
8 #define DIVISIONS 5
9
10 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
11 LRESULT CALLBACK ChildWndProc(HWND, UINT, WPARAM, LPARAM);
12
13 TCHAR szChildClass[] = TEXT("Checker3_Child");
14
15 int WINAPI WinMain( __in HINSTANCE hInstance
16 , __in_opt HINSTANCE hPrevInstance
17 , __in LPSTR lpCmdLine
18 , __in int nShowCmd )
19 {
20 static TCHAR szAppName[] = TEXT("Checker3");
21 HWND hwnd;
22 MSG msg;
23 WNDCLASS wndclass;
24
25 wndclass.style = CS_HREDRAW | CS_VREDRAW;
26 wndclass.lpfnWndProc = WndProc;
27 wndclass.cbClsExtra = 0;
28 wndclass.cbWndExtra = 0;
29 wndclass.hInstance = hInstance;
30 wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
31 wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
32 wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
33 wndclass.lpszMenuName = NULL;
34 wndclass.lpszClassName = szAppName;
35
36 if (!RegisterClass(&wndclass))
37 {
38 MessageBox(NULL, TEXT("Program requires Windows NT!")
39 , szAppName, MB_ICONERROR);
40 return 0;
41 }
42
43 wndclass.lpfnWndProc = ChildWndProc;
44 wndclass.cbWndExtra = sizeof(long);
45 wndclass.hIcon = NULL;
46 wndclass.lpszClassName = szChildClass;
47
48 RegisterClass(&wndclass);
49
50 hwnd = CreateWindow(szAppName, TEXT("Checker3 Mouse Hit-Test Demo")
51 , WS_OVERLAPPEDWINDOW
52 , CW_USEDEFAULT, CW_USEDEFAULT
53 , CW_USEDEFAULT, CW_USEDEFAULT
54 , NULL, NULL, hInstance, NULL);
55
56 ShowWindow(hwnd, nShowCmd);
57 UpdateWindow(hwnd);
58
59 while (GetMessage(&msg, NULL, 0, 0))
60 {
61 TranslateMessage(&msg);
62 DispatchMessage(&msg);
63 }
64
65 return msg.wParam;
66 }
67
68 LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
69 {
70 static HWND hwndChild[DIVISIONS][DIVISIONS];
71 int cxBlock, cyBlock, x, y;
72
73 switch (message)
74 {
75 case WM_CREATE:
76 for (x = 0; x != DIVISIONS; ++x)
77 for (y = 0; y != DIVISIONS; ++y)
78 {
79 hwndChild[x][y] = CreateWindow(szChildClass, NULL
80 , WS_CHILDWINDOW | WS_VISIBLE
81 , 0, 0, 0, 0
82 , hwnd, (HMENU)(y << 8 | x)
83 , (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE)
84 , NULL);
85 }
86 return 0;
87
88 case WM_SIZE:
89 cxBlock = LOWORD(lParam) / DIVISIONS;
90 cyBlock = HIWORD(lParam) / DIVISIONS;
91
92 for (x = 0; x != DIVISIONS; ++x)
93 for(y = 0; y != DIVISIONS; ++y)
94 {
95 MoveWindow(hwndChild[x][y]
96 , x * cxBlock, y * cyBlock
97 , cxBlock, cyBlock, TRUE);
98 }
99 return 0;
100
101 case WM_LBUTTONDOWN:
102 MessageBeep(0);
103 return 0;
104
105 case WM_DESTROY:
106 PostQuitMessage(0);
107 return 0;
108 }
109
110 return DefWindowProc(hwnd, message, wParam, lParam);
111 }
112
113 LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
114 {
115 HDC hdc;
116 PAINTSTRUCT ps;
117 RECT rect;
118
119 switch (message)
120 {
121 case WM_CREATE:
122 SetWindowLong(hwnd, 0, 0); // on/off flag
123 return 0;
124
125 case WM_LBUTTONDOWN:
126 SetWindowLong(hwnd, 0, 1 ^ GetWindowLong(hwnd, 0));
127 InvalidateRect(hwnd, NULL, FALSE);
128 return 0;
129
130 case WM_PAINT:
131 hdc = BeginPaint(hwnd, &ps);
132
133 GetClientRect(hwnd, &rect);
134 Rectangle(hdc, 0, 0, rect.right, rect.bottom);
135
136 if (GetWindowLong(hwnd, 0))
137 {
138 MoveToEx(hdc, 0, 0, NULL);
139 LineTo(hdc, rect.right, rect.bottom);
140 MoveToEx(hdc, 0, rect.bottom, NULL);
141 LineTo(hdc, rect.right, 0);
142 }
143
144 EndPaint(hwnd, &ps);
145 return 0;
146 }
147
148 return DefWindowProc(hwnd, message, wParam, lParam);
149 }
