reactos/rosapps/taskmgr/proclist.cpp

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/*
* ReactOS Task Manager
*
* proclist.cpp
*
* Copyright (C) 1999 - 2001 Brian Palmer <brianp@reactos.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "stdafx.h"
#include "taskmgr.h"
#include "ProcessPage.h"
#include "proclist.h"
#include "perfdata.h"
LRESULT CALLBACK ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
LONG OldProcessListWndProc;
LRESULT 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) GetClassLong(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.
//
ListView_GetItemRect(hWnd, 0, &rcClip, LVIR_BOUNDS);
ListView_GetItemRect(hWnd, ListView_GetItemCount(hWnd) - 1, &rcItem, LVIR_BOUNDS);
rcClip.bottom = rcItem.bottom;
ListView_GetItemRect(hWnd, 0, &rcItem, LVIR_ICON);
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 CallWindowProc((WNDPROC)OldProcessListWndProc, hWnd, message, wParam, lParam);
}