http://blog.csdn.net/chla/archive/2010/12/06/6058758.aspx
转贴地址： http://unix-cd.com/vc/www/23/2010-01/14771.html
这个例子展示了用SetWindoworgEx与滚动条结合起来使用， 我发了很长时间才明白窗口，视口这些玩意。
代码看起来非常简单， 所以我就没有写过多的注释了：
这个例子展示了用SetWindoworgEx与滚动条结合起来使用， 我发了很长时间才明白窗口，视口这些玩意。
代码看起来非常简单， 所以我就没有写过多的注释了：
源代码：
#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
PSTR szCmdLine,
int iCmdShow) {
static TCHAR szAppName[] = TEXT("Draw 100 circles");
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 = GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if(!RegisterClass(&wndclass)) {
MessageBox(NULL, TEXT("Register failure..."),
szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName,
szAppName,
WS_OVERLAPPEDWINDOW | WS_VSCROLL | WS_HSCROLL,
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 int cxClient, cyClient;
HDC hdc;
PAINTSTRUCT ps;
SCROLLINFO si;
int i, j, iVertPos, iHorzPos;
HBRUSH hBrush;
switch(message) {
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
si.cbSize = sizeof(si);
si.fMask = SIF_PAGE | SIF_RANGE;
si.nPage = cyClient;
si.nMin = 0;
si.nMax = 10 * cyClient;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
si.nPage = cxClient;
si.nMin = 0;
si.nMax = 10 * cxClient;
SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
return 0;
case WM_VSCROLL:
si.cbSize = sizeof(si);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd, SB_VERT, &si);
iVertPos = si.nPos;
switch(LOWORD(wParam)) {
case SB_LINEUP:
si.nPos -= 10;
break;
case SB_LINEDOWN:
si.nPos += 10;
break;
case SB_PAGEUP:
si.nPos -= si.nPage;
break;
case SB_PAGEDOWN:
si.nPos += si.nPage;
break;
case SB_THUMBTRACK:
si.nPos = si.nTrackPos;
break;
default:
break;
}
si.fMask = SIF_POS;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
GetScrollInfo(hwnd, SB_VERT, &si);
if(si.nPos != iVertPos) {
ScrollWindow(hwnd, 0, iVertPos - si.nPos, NULL, NULL);
UpdateWindow(hwnd);
}
return 0;
case WM_HSCROLL:
si.cbSize = sizeof(si);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd, SB_HORZ, &si);
iHorzPos = si.nPos;
switch(LOWORD(wParam)) {
case SB_LINELEFT:
si.nPos -= 20;
break;
case SB_LINERIGHT:
si.nPos += 20;
break;
case SB_PAGELEFT:
si.nPos -= cxClient;
break;
case SB_PAGERIGHT:
si.nPos += cxClient;
break;
case SB_THUMBTRACK:
si.nPos = si.nTrackPos;
default:
break;
}
si.fMask = SIF_POS;
SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
GetScrollInfo(hwnd, SB_HORZ, &si);
if(si.nPos != iHorzPos) {
ScrollWindow(hwnd, iHorzPos - si.nPos, 0, NULL, NULL);
UpdateWindow(hwnd);
}
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
si.cbSize = sizeof(si);
si.fMask = SIF_POS;
GetScrollInfo(hwnd, SB_VERT, &si);
iVertPos = si.nPos;
GetScrollInfo(hwnd, SB_HORZ, &si);
iHorzPos = si.nPos;
SetWindowOrgEx(hdc, iHorzPos, iVertPos, NULL);
hBrush = CreateSolidBrush(RGB(0, 100, 100));
SelectObject(hdc, hBrush);
for(i = 0; i < 10; i++)
for(j = 0; j < 10; j++)
{
Ellipse(hdc, j * cxClient + cxClient / 4, i * cyClient + (cyClient / 2 - cxClient / 4),
j * cxClient + 3 * cxClient / 4, i * cyClient + (cyClient / 2 + cxClient / 4));
}
EndPaint(hwnd, &ps);
DeleteObject(hBrush);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
代码
1 #include <windows.h>
2 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
3 int WINAPI WinMain(HINSTANCE hInstance,
4 HINSTANCE hPrevInstance,
5 PSTR szCmdLine,
6 int iCmdShow) {
7 static TCHAR szAppName[] = TEXT("Draw 100 circles");
8 HWND hwnd;
9 MSG msg;
10 WNDCLASS wndclass;
11
12 wndclass.style = CS_HREDRAW | CS_VREDRAW;
13 wndclass.lpfnWndProc = WndProc;
14 wndclass.cbClsExtra = 0;
15 wndclass.cbWndExtra = 0;
16 wndclass.hInstance = hInstance;
17 wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
18 wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
19 wndclass.hbrBackground = GetStockObject(WHITE_BRUSH);
20 wndclass.lpszMenuName = NULL;
21 wndclass.lpszClassName = szAppName;
22
23 if(!RegisterClass(&wndclass)) {
24 MessageBox(NULL, TEXT("Register failure..."),
25 szAppName, MB_ICONERROR);
26 return 0;
27 }
28
29 hwnd = CreateWindow(szAppName,
30 szAppName,
31 WS_OVERLAPPEDWINDOW | WS_VSCROLL | WS_HSCROLL,
32 CW_USEDEFAULT,
33 CW_USEDEFAULT,
34 CW_USEDEFAULT,
35 CW_USEDEFAULT,
36 NULL,
37 NULL,
38 hInstance,
39 NULL);
40
41 ShowWindow(hwnd, iCmdShow);
42 UpdateWindow(hwnd);
43
44 while(GetMessage(&msg, NULL, 0, 0)) {
45 TranslateMessage(&msg);
46 DispatchMessage(&msg);
47 }
48 return msg.wParam;
49 }
50 LRESULT CALLBACK WndProc(HWND hwnd,
51 UINT message,
52 WPARAM wParam,
53 LPARAM lParam) {
54 static int cxClient, cyClient;
55 HDC hdc;
56 PAINTSTRUCT ps;
57 SCROLLINFO si;
58 int i, j, iVertPos, iHorzPos;
59 HBRUSH hBrush;
60
61 switch(message) {
62
63 case WM_SIZE:
64 cxClient = LOWORD(lParam);
65 cyClient = HIWORD(lParam);
66 si.cbSize = sizeof(si);
67 si.fMask = SIF_PAGE | SIF_RANGE;
68 si.nPage = cyClient;
69 si.nMin = 0;
70 si.nMax = 10 * cyClient;
71 SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
72 si.nPage = cxClient;
73 si.nMin = 0;
74 si.nMax = 10 * cxClient;
75 SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
76 return 0;
77
78 case WM_VSCROLL:
79 si.cbSize = sizeof(si);
80 si.fMask = SIF_ALL;
81 GetScrollInfo(hwnd, SB_VERT, &si);
82 iVertPos = si.nPos;
83
84 switch(LOWORD(wParam)) {
85 case SB_LINEUP:
86 si.nPos -= 10;
87 break;
88 case SB_LINEDOWN:
89 si.nPos += 10;
90 break;
91 case SB_PAGEUP:
92 si.nPos -= si.nPage;
93 break;
94 case SB_PAGEDOWN:
95 si.nPos += si.nPage;
96 break;
97 case SB_THUMBTRACK:
98 si.nPos = si.nTrackPos;
99 break;
100 default:
101 break;
102 }
103
104 si.fMask = SIF_POS;
105 SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
106 GetScrollInfo(hwnd, SB_VERT, &si);
107 if(si.nPos != iVertPos) {
108 ScrollWindow(hwnd, 0, iVertPos - si.nPos, NULL, NULL);
109 UpdateWindow(hwnd);
110 }
111 return 0;
112
113 case WM_HSCROLL:
114 si.cbSize = sizeof(si);
115 si.fMask = SIF_ALL;
116 GetScrollInfo(hwnd, SB_HORZ, &si);
117 iHorzPos = si.nPos;
118
119 switch(LOWORD(wParam)) {
120 case SB_LINELEFT:
121 si.nPos -= 20;
122 break;
123 case SB_LINERIGHT:
124 si.nPos += 20;
125 break;
126 case SB_PAGELEFT:
127 si.nPos -= cxClient;
128 break;
129 case SB_PAGERIGHT:
130 si.nPos += cxClient;
131 break;
132 case SB_THUMBTRACK:
133 si.nPos = si.nTrackPos;
134 default:
135 break;
136 }
137
138 si.fMask = SIF_POS;
139 SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
140 GetScrollInfo(hwnd, SB_HORZ, &si);
141 if(si.nPos != iHorzPos) {
142 ScrollWindow(hwnd, iHorzPos - si.nPos, 0, NULL, NULL);
143 UpdateWindow(hwnd);
144 }
145 return 0;
146
147 case WM_PAINT:
148 hdc = BeginPaint(hwnd, &ps);
149 si.cbSize = sizeof(si);
150 si.fMask = SIF_POS;
151 GetScrollInfo(hwnd, SB_VERT, &si);
152 iVertPos = si.nPos;
153 GetScrollInfo(hwnd, SB_HORZ, &si);
154 iHorzPos = si.nPos;
155 SetWindowOrgEx(hdc, iHorzPos, iVertPos, NULL);
156 hBrush = CreateSolidBrush(RGB(0, 100, 100));
157 SelectObject(hdc, hBrush);
158
159 for(i = 0; i < 10; i++)
160 for(j = 0; j < 10; j++)
161 {
162 Ellipse(hdc, j * cxClient + cxClient / 4, i * cyClient + (cyClient / 2 - cxClient / 4),
163 j * cxClient + 3 * cxClient / 4, i * cyClient + (cyClient / 2 + cxClient / 4));
164 }
165 EndPaint(hwnd, &ps);
166 DeleteObject(hBrush);
167 return 0;
168
169 case WM_DESTROY:
170 PostQuitMessage(0);
171 return 0;
172 }
173 return DefWindowProc(hwnd, message, wParam, lParam);
174 }
175
源码本地下载地址: https://files.cnblogs.com/chulia20002001/Ttreelist.rar
发表于 @2010年12月06日 16:57:00