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/*
* Undocumented SmoothScrollWindow function from COMCTL32.DLL
*
* Copyright 2000 Marcus Meissner <marcus@jet.franken.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* TODO
* - actually add smooth scrolling
*/
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "winreg.h"
#include "winerror.h"
#include "winuser.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(commctrl);
static DWORD smoothscroll = 2;
typedef BOOL (CALLBACK *SCROLLWINDOWEXPROC)(HWND,INT,INT,LPRECT,LPRECT,HRGN,LPRECT,DWORD);
typedef struct tagSMOOTHSCROLLSTRUCT {
DWORD dwSize;
DWORD x2;
HWND hwnd;
DWORD dx;
DWORD dy;
LPRECT lpscrollrect;
LPRECT lpcliprect;
HRGN hrgnupdate;
LPRECT lpupdaterect;
DWORD flags;
DWORD stepinterval;
DWORD dx_step;
DWORD dy_step;
SCROLLWINDOWEXPROC scrollfun; /* same parameters as ScrollWindowEx */
} SMOOTHSCROLLSTRUCT;
/**************************************************************************
* SmoothScrollWindow [COMCTL32.382]
*
* Lots of magic for smooth scrolling windows.
*
* RETURNS
* Success: TRUE
* Failure: FALSE
*
* BUGS
* Currently only scrolls ONCE. The comctl32 implementation uses GetTickCount
* and what else to do smooth scrolling.
*/
BOOL WINAPI SmoothScrollWindow( const SMOOTHSCROLLSTRUCT *smooth ) {
LPRECT lpupdaterect = smooth->lpupdaterect;
HRGN hrgnupdate = smooth->hrgnupdate;
RECT tmprect;
DWORD flags = smooth->flags;
if (smooth->dwSize!=sizeof(SMOOTHSCROLLSTRUCT))
return FALSE;
if (!lpupdaterect)
lpupdaterect = &tmprect;
SetRectEmpty(lpupdaterect);
if (!(flags & 0x40000)) { /* no override, use system wide defaults */
if (smoothscroll == 2) {
HKEY hkey;
smoothscroll = 0;
if (!RegOpenKeyA(HKEY_CURRENT_USER,"Control Panel\\Desktop",&hkey)) {
DWORD len = 4;
RegQueryValueExA(hkey,"SmoothScroll",0,0,(LPBYTE)&smoothscroll,&len);
RegCloseKey(hkey);
}
}
if (!smoothscroll)
flags |= 0x20000;
}
if (flags & 0x20000) { /* are we doing jump scrolling? */
if ((smooth->x2 & 1) && smooth->scrollfun)
return smooth->scrollfun(
smooth->hwnd,smooth->dx,smooth->dy,smooth->lpscrollrect,
smooth->lpcliprect,hrgnupdate,lpupdaterect,
flags & 0xffff
);
else
return ScrollWindowEx(
smooth->hwnd,smooth->dx,smooth->dy,smooth->lpscrollrect,
smooth->lpcliprect,hrgnupdate,lpupdaterect,
flags & 0xffff
);
}
FIXME("(hwnd=%p,flags=%x,x2=%x): should smooth scroll here.\n",
smooth->hwnd,flags,smooth->x2
);
/* FIXME: do timer based smooth scrolling */
if ((smooth->x2 & 1) && smooth->scrollfun)
return smooth->scrollfun(
smooth->hwnd,smooth->dx,smooth->dy,smooth->lpscrollrect,
smooth->lpcliprect,hrgnupdate,lpupdaterect,
flags & 0xffff
);
else
return ScrollWindowEx(
smooth->hwnd,smooth->dx,smooth->dy,smooth->lpscrollrect,
smooth->lpcliprect,hrgnupdate,lpupdaterect,
flags & 0xffff
);
}
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