В книге Петцолда "Программирование в Windows" (Programming Windows) есть программы с обработкой полос прокрутки для окна.
В данном примере реализована и вертикальная и горизонтальная прокрутка. Может быть будет полезно раз вы обрабатываете события SB_LINEDOWN, SB_PAGEDOWN и т.д.?
Код:
/*----------------------------------------------------
SYSMETS3.C -- System Metrics Display Program No. 3
(c) Charles Petzold, 1996
----------------------------------------------------*/
#include <windows.h>
#include "sysmets.h"
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static char szAppName[] = "SysMets3" ;
HWND hwnd ;
MSG msg ;
WNDCLASSEX wndclass ;
wndclass.cbSize = sizeof (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 ;
wndclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION) ;
RegisterClassEx (&wndclass) ;
hwnd = CreateWindow (szAppName, "Get System Metrics No. 3",
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 iMsg, WPARAM wParam, LPARAM lParam)
{
static int cxChar, cxCaps, cyChar, cxClient, cyClient, iMaxWidth,
iVscrollPos, iVscrollMax, iHscrollPos, iHscrollMax ;
char szBuffer[10] ;
HDC hdc ;
int i, x, y, iPaintBeg, iPaintEnd, iVscrollInc, iHscrollInc ;
PAINTSTRUCT ps ;
TEXTMETRIC tm ;
switch (iMsg)
{
case WM_CREATE :
hdc = GetDC (hwnd) ;
GetTextMetrics (hdc, &tm) ;
cxChar = tm.tmAveCharWidth ;
cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2 ;
cyChar = tm.tmHeight + tm.tmExternalLeading ;
ReleaseDC (hwnd, hdc) ;
iMaxWidth = 40 * cxChar + 22 * cxCaps ;
return 0 ;
case WM_SIZE :
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
iVscrollMax = max (0, NUMLINES + 2 - cyClient / cyChar) ;
iVscrollPos = min (iVscrollPos, iVscrollMax) ;
SetScrollRange (hwnd, SB_VERT, 0, iVscrollMax, FALSE) ;
SetScrollPos (hwnd, SB_VERT, iVscrollPos, TRUE) ;
iHscrollMax = max (0, 2 + (iMaxWidth - cxClient) / cxChar) ;
iMaxWidth = 40 * cxChar + 22 * cxCaps ;
iHscrollPos = min (iHscrollPos, iHscrollMax) ;
SetScrollRange (hwnd, SB_HORZ, 0, iHscrollMax, FALSE) ;
SetScrollPos (hwnd, SB_HORZ, iHscrollPos, TRUE) ;
return 0 ;
case WM_VSCROLL :
switch (LOWORD (wParam))
{
case SB_TOP :
iVscrollInc = -iVscrollPos ;
break ;
case SB_BOTTOM :
iVscrollInc = iVscrollMax - iVscrollPos ;
break ;
case SB_LINEUP :
iVscrollInc = -1 ;
break ;
case SB_LINEDOWN :
iVscrollInc = 1 ;
break ;
case SB_PAGEUP :
iVscrollInc = min (-1, -cyClient / cyChar) ;
break ;
case SB_PAGEDOWN :
iVscrollInc = max (1, cyClient / cyChar) ;
break ;
case SB_THUMBTRACK :
iVscrollInc = HIWORD (wParam) - iVscrollPos ;
break ;
default :
iVscrollInc = 0 ;
}
iVscrollInc = max (-iVscrollPos,
min (iVscrollInc, iVscrollMax - iVscrollPos)) ;
if (iVscrollInc != 0)
{
iVscrollPos += iVscrollInc ;
ScrollWindow (hwnd, 0, -cyChar * iVscrollInc, NULL, NULL) ;
SetScrollPos (hwnd, SB_VERT, iVscrollPos, TRUE) ;
UpdateWindow (hwnd) ;
}
return 0 ;
case WM_HSCROLL :
switch (LOWORD (wParam))
{
case SB_LINEUP :
iHscrollInc = -1 ;
break ;
case SB_LINEDOWN :
iHscrollInc = 1 ;
break ;
case SB_PAGEUP :
iHscrollInc = -8 ;
break ;
case SB_PAGEDOWN :
iHscrollInc = 8 ;
break ;
case SB_THUMBPOSITION :
iHscrollInc = HIWORD (wParam) - iHscrollPos ;
break ;
default :
iHscrollInc = 0 ;
}
iHscrollInc = max (-iHscrollPos,
min (iHscrollInc, iHscrollMax - iHscrollPos)) ;
if (iHscrollInc != 0)
{
iHscrollPos += iHscrollInc ;
ScrollWindow (hwnd, -cxChar * iHscrollInc, 0, NULL, NULL) ;
SetScrollPos (hwnd, SB_HORZ, iHscrollPos, TRUE) ;
}
return 0 ;
case WM_PAINT :
hdc = BeginPaint (hwnd, &ps) ;
iPaintBeg = max (0, iVscrollPos + ps.rcPaint.top / cyChar - 1) ;
iPaintEnd = min (NUMLINES,
iVscrollPos + ps.rcPaint.bottom / cyChar) ;
for (i = iPaintBeg ; i < iPaintEnd ; i++)
{
x = cxChar * (1 - iHscrollPos) ;
y = cyChar * (1 - iVscrollPos + i) ;
TextOut (hdc, x, y,
sysmetrics[i].szLabel,
strlen (sysmetrics[i].szLabel)) ;
TextOut (hdc, x + 22 * cxCaps, y,
sysmetrics[i].szDesc,
strlen (sysmetrics[i].szDesc)) ;
SetTextAlign (hdc, TA_RIGHT | TA_TOP) ;
TextOut (hdc, x + 22 * cxCaps + 40 * cxChar, y,
szBuffer,
wsprintf (szBuffer, "%5d",
GetSystemMetrics (sysmetrics[i].iIndex))) ;
SetTextAlign (hdc, TA_LEFT | TA_TOP) ;
}
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY :
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
}
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