6 * Copyright (C) 1999 - 2001 Brian Palmer <brianp@reactos.org>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
23 #define WIN32_LEAN_AND_MEAN /* Exclude rarely-used stuff from Windows headers */
37 WNDPROC OldProcessListWndProc;
40 LRESULT CALLBACK ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
53 * The list control produces a nasty flicker
54 * when the user is resizing the window because
55 * it erases the background to white, then
56 * paints the list items over it.
58 * We will clip the drawing so that it only
59 * erases the parts of the list control that
60 * show only the background.
64 * Get the device context and save it's state
65 * to be restored after we're done
71 * Get the background brush
73 hbrBackground = (HBRUSH) GetClassLongPtr(hWnd, GCLP_HBRBACKGROUND);
76 * Calculate the clip rect by getting the RECT
77 * of the first and last items and adding them up.
79 * We also have to get the item's icon RECT and
80 * subtract it from our clip rect because we don't
81 * use icons in this list control.
83 rcClip.left = LVIR_BOUNDS;
84 SendMessage(hWnd, LVM_GETITEMRECT, 0, (LPARAM) &rcClip);
85 rcItem.left = LVIR_BOUNDS;
86 SendMessage(hWnd, LVM_GETITEMRECT, ListView_GetItemCount(hWnd) - 1, (LPARAM) &rcItem);
88 rcClip.bottom = rcItem.bottom;
89 rcItem.left = LVIR_ICON;
90 SendMessage(hWnd, LVM_GETITEMRECT, 0, (LPARAM) &rcItem);
91 rcClip.left = rcItem.right;
94 * Now exclude the clip rect
96 ExcludeClipRect(hDC, rcClip.left, rcClip.top, rcClip.right, rcClip.bottom);
99 * Now erase the background
102 * FIXME: Should I erase it myself or
103 * pass down the updated HDC and let
104 * the default handler do it?
106 GetClientRect(hWnd, &rcItem);
107 FillRect(hDC, &rcItem, hbrBackground);
110 * Now restore the DC state that we
113 RestoreDC(hDC, DcSave);
119 * We pass on all messages except WM_ERASEBKGND
121 return CallWindowProc(OldProcessListWndProc, hWnd, message, wParam, lParam);