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https://github.com/reactos/reactos.git
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99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/*
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* PROJECT: ReactOS Task Manager
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* LICENSE: LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
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* PURPOSE: Processes List.
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* COPYRIGHT: Copyright 1999-2001 Brian Palmer <brianp@reactos.org>
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*/
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#include "precomp.h"
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INT_PTR CALLBACK ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
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WNDPROC OldProcessListWndProc;
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INT_PTR CALLBACK
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ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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HBRUSH hbrBackground;
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RECT rcItem;
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RECT rcClip;
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HDC hDC;
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int DcSave;
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switch (message)
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{
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case WM_ERASEBKGND:
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/*
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* The list control produces a nasty flicker
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* when the user is resizing the window because
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* it erases the background to white, then
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* paints the list items over it.
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*
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* We will clip the drawing so that it only
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* erases the parts of the list control that
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* show only the background.
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*/
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/*
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* Get the device context and save it's state
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* to be restored after we're done
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*/
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hDC = (HDC) wParam;
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DcSave = SaveDC(hDC);
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/*
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* Get the background brush
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*/
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hbrBackground = (HBRUSH)(LONG_PTR) GetClassLongPtrW(hWnd, GCL_HBRBACKGROUND);
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/*
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* Calculate the clip rect by getting the RECT
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* of the first and last items and adding them up.
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*
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* We also have to get the item's icon RECT and
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* subtract it from our clip rect because we don't
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* use icons in this list control.
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*/
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rcClip.left = LVIR_BOUNDS;
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SendMessageW(hWnd, LVM_GETITEMRECT, 0, (LPARAM)&rcClip);
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rcItem.left = LVIR_BOUNDS;
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SendMessageW(hWnd, LVM_GETITEMRECT, ListView_GetItemCount(hWnd) - 1, (LPARAM)&rcItem);
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rcClip.bottom = rcItem.bottom;
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rcClip.right = rcItem.right;
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rcItem.left = LVIR_ICON;
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SendMessageW(hWnd, LVM_GETITEMRECT, 0, (LPARAM)&rcItem);
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rcClip.left = rcItem.right;
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/*
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* Now exclude the clip rect
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*/
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ExcludeClipRect(hDC, rcClip.left, rcClip.top, rcClip.right, rcClip.bottom);
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/*
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* Now erase the background
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*
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*
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* FIXME: Should I erase it myself or
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* pass down the updated HDC and let
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* the default handler do it?
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*/
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GetClientRect(hWnd, &rcItem);
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FillRect(hDC, &rcItem, hbrBackground);
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/*
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* Now restore the DC state that we
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* saved earlier
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*/
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RestoreDC(hDC, DcSave);
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return TRUE;
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}
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/*
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* We pass on all messages except WM_ERASEBKGND
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*/
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return CallWindowProcW(OldProcessListWndProc, hWnd, message, wParam, lParam);
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}
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