comctl32: Fix missing void in empty parameter list.
[wine] / dlls / comctl32 / smoothscroll.c
1 /*
2  * Undocumented SmoothScrollWindow function from COMCTL32.DLL
3  *
4  * Copyright 2000 Marcus Meissner <marcus@jet.franken.de>
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19  *
20  * TODO
21  *     - actually add smooth scrolling
22  */
23
24 #include <stdarg.h>
25
26 #include "windef.h"
27 #include "winbase.h"
28 #include "winreg.h"
29 #include "winerror.h"
30 #include "winuser.h"
31 #include "wine/debug.h"
32
33 WINE_DEFAULT_DEBUG_CHANNEL(commctrl);
34
35 static DWORD    smoothscroll = 2;
36
37 typedef BOOL (CALLBACK *SCROLLWINDOWEXPROC)(HWND,INT,INT,LPRECT,LPRECT,HRGN,LPRECT,DWORD);
38 typedef struct tagSMOOTHSCROLLSTRUCT {
39         DWORD                   dwSize;
40         DWORD                   x2;
41         HWND                    hwnd;
42         DWORD                   dx;
43
44         DWORD                   dy;
45         LPRECT                  lpscrollrect;
46         LPRECT                  lpcliprect;
47         HRGN                    hrgnupdate;
48
49         LPRECT                  lpupdaterect;
50         DWORD                   flags;
51         DWORD                   stepinterval;
52         DWORD                   dx_step;
53
54         DWORD                   dy_step;
55         SCROLLWINDOWEXPROC      scrollfun;      /* same parameters as ScrollWindowEx */
56 } SMOOTHSCROLLSTRUCT;
57
58 /**************************************************************************
59  * SmoothScrollWindow [COMCTL32.382]
60  *
61  * Lots of magic for smooth scrolling windows.
62  *
63  * RETURNS
64  *     Success: TRUE
65  *     Failure: FALSE
66  *
67  * BUGS
68  *     Currently only scrolls ONCE. The comctl32 implementation uses GetTickCount
69  *     and what else to do smooth scrolling.
70  */
71 BOOL WINAPI SmoothScrollWindow( const SMOOTHSCROLLSTRUCT *smooth ) {
72    LPRECT       lpupdaterect = smooth->lpupdaterect;
73    HRGN         hrgnupdate = smooth->hrgnupdate;
74    RECT         tmprect;
75    DWORD        flags = smooth->flags;
76
77    if (smooth->dwSize!=sizeof(SMOOTHSCROLLSTRUCT))
78        return FALSE;
79
80    if (!lpupdaterect)
81        lpupdaterect = &tmprect;
82    SetRectEmpty(lpupdaterect);
83
84    if (!(flags & 0x40000)) { /* no override, use system wide defaults */
85        if (smoothscroll == 2) {
86            HKEY hkey;
87
88            smoothscroll = 0;
89            if (!RegOpenKeyA(HKEY_CURRENT_USER,"Control Panel\\Desktop",&hkey)) {
90                DWORD    len = 4;
91
92                RegQueryValueExA(hkey,"SmoothScroll",0,0,(LPBYTE)&smoothscroll,&len);
93                RegCloseKey(hkey);
94            }
95        }
96        if (!smoothscroll)
97            flags |= 0x20000;
98    }
99
100    if (flags & 0x20000) { /* are we doing jump scrolling? */
101        if ((smooth->x2 & 1) && smooth->scrollfun)
102            return smooth->scrollfun(
103                smooth->hwnd,smooth->dx,smooth->dy,smooth->lpscrollrect,
104                smooth->lpcliprect,hrgnupdate,lpupdaterect,
105                flags & 0xffff
106            );
107        else
108            return ScrollWindowEx(
109                smooth->hwnd,smooth->dx,smooth->dy,smooth->lpscrollrect,
110                smooth->lpcliprect,hrgnupdate,lpupdaterect,
111                flags & 0xffff
112            );
113    }
114
115    FIXME("(hwnd=%p,flags=%x,x2=%x): should smooth scroll here.\n",
116            smooth->hwnd,flags,smooth->x2
117    );
118    /* FIXME: do timer based smooth scrolling */
119    if ((smooth->x2 & 1) && smooth->scrollfun)
120        return smooth->scrollfun(
121            smooth->hwnd,smooth->dx,smooth->dy,smooth->lpscrollrect,
122            smooth->lpcliprect,hrgnupdate,lpupdaterect,
123            flags & 0xffff
124        );
125    else
126        return ScrollWindowEx(
127            smooth->hwnd,smooth->dx,smooth->dy,smooth->lpscrollrect,
128            smooth->lpcliprect,hrgnupdate,lpupdaterect,
129            flags & 0xffff
130        );
131 }