/* * 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 St, Fifth Floor, Boston, MA 02110-1301, USA */ #include <stdio.h> #include <stdlib.h> #include <windows.h> #include <commctrl.h> #include <winnt.h> #include "taskmgr.h" #include "perfdata.h" WNDPROC OldProcessListWndProc; LRESULT CALLBACK ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { HBRUSH hbrBackground; int count; 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 its state * to be restored after we're done */ hDC = (HDC) wParam; DcSave = SaveDC(hDC); /* * Get the background brush */ hbrBackground = (HBRUSH) GetClassLongPtrW(hWnd, GCLP_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; count = SendMessageW(hWnd, LVM_GETITEMCOUNT, 0, 0); SendMessageW(hWnd, LVM_GETITEMRECT, count - 1, (LPARAM) &rcItem); rcClip.bottom = rcItem.bottom; 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); }