Create a branch for header work.

svn path=/branches/header-work/; revision=45691

base/applications/taskmgr/proclist.c

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+/*
+ *  ReactOS Task Manager
+ *
+ *  proclist.c
+ *
+ *  Copyright (C) 1999 - 2001  Brian Palmer  <brianp@reactos.org>
+ *
+ * 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 Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <precomp.h>
+
+
+INT_PTR CALLBACK    ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
+
+WNDPROC             OldProcessListWndProc;
+
+
+INT_PTR CALLBACK
+ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+    HBRUSH  hbrBackground;
+    RECT    rcItem;
+    RECT    rcClip;
+    HDC     hDC;
+    int     DcSave;
+
+    switch (message)
+    {
+    case WM_ERASEBKGND:
+
+        /*
+         * The list control produces a nasty flicker
+         * when the user is resizing the window because
+         * it erases the background to white, then
+         * paints the list items over it.
+         *
+         * We will clip the drawing so that it only
+         * erases the parts of the list control that
+         * show only the background.
+         */
+
+        /*
+         * Get the device context and save it's state
+         * to be restored after we're done
+         */
+        hDC = (HDC) wParam;
+        DcSave = SaveDC(hDC);
+
+        /*
+         * Get the background brush
+         */
+        hbrBackground = (HBRUSH)(LONG_PTR) GetClassLongPtrW(hWnd, GCL_HBRBACKGROUND);
+
+        /*
+         * Calculate the clip rect by getting the RECT
+         * of the first and last items and adding them up.
+         *
+         * We also have to get the item's icon RECT and
+         * subtract it from our clip rect because we don't
+         * use icons in this list control.
+         */
+        rcClip.left = LVIR_BOUNDS;
+        SendMessageW(hWnd, LVM_GETITEMRECT, 0, (LPARAM)&rcClip);
+        rcItem.left = LVIR_BOUNDS;
+        SendMessageW(hWnd, LVM_GETITEMRECT, ListView_GetItemCount(hWnd) - 1, (LPARAM)&rcItem);
+        rcClip.bottom = rcItem.bottom;
+	rcClip.right = rcItem.right;
+        rcItem.left = LVIR_ICON;
+        SendMessageW(hWnd, LVM_GETITEMRECT, 0, (LPARAM)&rcItem);
+        rcClip.left = rcItem.right;
+
+        /*
+         * Now exclude the clip rect
+         */
+        ExcludeClipRect(hDC, rcClip.left, rcClip.top, rcClip.right, rcClip.bottom);
+
+        /*
+         * Now erase the background
+         *
+         *
+         * FIXME: Should I erase it myself or
+         * pass down the updated HDC and let
+         * the default handler do it?
+         */
+        GetClientRect(hWnd, &rcItem);
+        FillRect(hDC, &rcItem, hbrBackground);
+
+        /*
+         * Now restore the DC state that we
+         * saved earlier
+         */
+        RestoreDC(hDC, DcSave);
+
+        return TRUE;
+    }
+
+    /*
+     * We pass on all messages except WM_ERASEBKGND
+     */
+    return CallWindowProcW(OldProcessListWndProc, hWnd, message, wParam, lParam);
+}