#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("keyboard interface demo");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.lpfnWndProc = WndProc;
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;
switch(message) {
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
si.cbSize = sizeof(si);
si.fMask = SIF_RANGE | SIF_PAGE;
si.nMin = 0;
si.nMax = 10 * cyClient;
si.nPage = cyClient;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
si.cbSize = sizeof(si);
si.fMask = SIF_RANGE | SIF_PAGE;
si.nMin = 0;
si.nMax = cxClient * 10;
si.nPage = 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_TOP:
si.nPos = si.nMin;
break;
case SB_BOTTOM:
si.nPos = si.nMax;
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 -= 15;
break;
case SB_LINERIGHT:
si.nPos += 15;
break;
case SB_PAGELEFT:
si.nPos -= si.nPage;
break;
case SB_PAGERIGHT:
si.nPos += si.nPage;
break;
case SB_THUMBTRACK:
si.nPos = si.nTrackPos;
break;
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_KEYDOWN:
switch(wParam) {
case VK_HOME:
SendMessage(hwnd, WM_VSCROLL, SB_TOP, NULL);
break;
case VK_END:
SendMessage(hwnd, WM_VSCROLL, SB_BOTTOM, NULL);
break;
case VK_PRIOR:
SendMessage(hwnd, WM_VSCROLL, SB_PAGEUP, NULL);
break;
case VK_NEXT:
SendMessage(hwnd, WM_VSCROLL, SB_PAGEDOWN, NULL);
break;
case VK_UP:
SendMessage(hwnd, WM_VSCROLL, SB_LINEUP, NULL);
break;
case VK_DOWN:
SendMessage(hwnd, WM_VSCROLL, SB_LINEDOWN, NULL);
break;
case VK_LEFT:
SendMessage(hwnd, WM_HSCROLL, SB_LINELEFT, NULL);
break;
case VK_RIGHT:
SendMessage(hwnd, WM_HSCROLL, SB_LINERIGHT, NULL);
break;
default:
break;
}
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);
for(i = 0; i < 10; i++)
for(j = 0; j < 10; j++) {
Ellipse(hdc, cxClient * i, cyClient * j, cxClient * (i + 1), cyClient * (j + 1));
}
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
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