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 }
132
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