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use WM_NOTIFY messages to communicate with the desktop window thread as they can't be sent from processes other than csrss

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svn path=/trunk/; revision=10577
This commit is contained in:
Thomas Bluemel 2004-08-17 14:57:52 +00:00
parent a7f4ff2664
commit 2ac9e121e9
1 changed files with 93 additions and 45 deletions
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138
reactos/subsys/csrss/win32csr/desktopbg.c
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@ -1,4 +1,4 @@
/* $Id: desktopbg.c,v 1.8 2004/05/08 19:35:32 weiden Exp $
/* $Id: desktopbg.c,v 1.9 2004/08/17 14:57:52 weiden Exp $
*
* reactos/subsys/csrss/win32csr/desktopbg.c
*
@ -43,63 +43,97 @@ typedef struct tagDTBG_THREAD_DATA
NTSTATUS Status;
} DTBG_THREAD_DATA, *PDTBG_THREAD_DATA;
typedef struct tagPRIVATE_NOTIFY_DESKTOP
{
NMHDR hdr;
union
{
struct /* PM_SHOW_DESKTOP */
{
int Width;
int Height;
} ShowDesktop;
};
} PRIVATE_NOTIFY_DESKTOP, *PPRIVATE_NOTIFY_DESKTOP;
static BOOL Initialized = FALSE;
static HWND VisibleDesktopWindow = NULL;
static LRESULT CALLBACK
DtbgWindowProc(HWND Wnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
LRESULT Result;
switch(Msg)
{
case WM_ERASEBKGND:
{
PaintDesktop((HDC)wParam);
Result = 1;
}
break;
return 1;
case WM_PAINT:
{
PAINTSTRUCT PS;
RECT rc;
HDC hDC;
if(GetUpdateRect(Wnd, &rc, FALSE) &&
(hDC = BeginPaint(Wnd, &PS)))
{
PAINTSTRUCT PS;
BeginPaint(Wnd, &PS);
/* No need to paint, already done in WM_ERASEBKGND. */
PaintDesktop(hDC);
EndPaint(Wnd, &PS);
Result = 0;
}
break;
return 0;
}
case WM_SETCURSOR:
Result = (LRESULT) SetCursor(LoadCursorW(0, (LPCWSTR)IDC_ARROW));
break;
return (LRESULT) SetCursor(LoadCursorW(0, (LPCWSTR)IDC_ARROW));
case WM_NCCREATE:
Result = (LRESULT) TRUE;
break;
return (LRESULT) TRUE;
case WM_CREATE:
Result = 0;
break;
case PM_SHOW_DESKTOP:
Result = ! SetWindowPos(Wnd,
NULL, 0, 0,
(int)(short) LOWORD(lParam),
(int)(short) HIWORD(lParam),
SWP_NOACTIVATE | SWP_NOZORDER | SWP_SHOWWINDOW | SWP_NOREDRAW);
UpdateWindow(Wnd);
VisibleDesktopWindow = Wnd;
break;
case PM_HIDE_DESKTOP:
Result = ! SetWindowPos(Wnd,
NULL, 0, 0, 0, 0,
SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOMOVE | SWP_NOSIZE |
SWP_HIDEWINDOW);
UpdateWindow(Wnd);
VisibleDesktopWindow = NULL;
break;
default:
Result = 0;
break;
return 0;
case WM_NOTIFY:
{
PPRIVATE_NOTIFY_DESKTOP nmh = (PPRIVATE_NOTIFY_DESKTOP)lParam;
/* Use WM_NOTIFY for private messages since it can't be sent between
processes! */
switch(nmh->hdr.code)
{
case PM_SHOW_DESKTOP:
{
LRESULT Result;
Result = ! SetWindowPos(Wnd,
NULL, 0, 0,
nmh->ShowDesktop.Width,
nmh->ShowDesktop.Height,
SWP_NOACTIVATE | SWP_NOZORDER | SWP_SHOWWINDOW | SWP_NOREDRAW);
UpdateWindow(Wnd);
VisibleDesktopWindow = Wnd;
return Result;
}
case PM_HIDE_DESKTOP:
{
LRESULT Result;
Result = ! SetWindowPos(Wnd,
NULL, 0, 0, 0, 0,
SWP_NOACTIVATE | SWP_NOZORDER | SWP_NOMOVE | SWP_NOSIZE |
SWP_HIDEWINDOW);
UpdateWindow(Wnd);
VisibleDesktopWindow = NULL;
return Result;
}
default:
DPRINT("Unknown notification code 0x%x sent to the desktop window!\n", nmh->code);
return 0;
}
}
}
return Result;
return 0;
}
static BOOL FASTCALL
@ -253,16 +287,23 @@ CSR_API(CsrCreateDesktop)
CSR_API(CsrShowDesktop)
{
PRIVATE_NOTIFY_DESKTOP nmh;
DPRINT("CsrShowDesktop\n");
Reply->Header.MessageSize = sizeof(CSRSS_API_REPLY);
Reply->Header.DataSize = sizeof(CSRSS_API_REPLY) - LPC_MESSAGE_BASE_SIZE;
nmh.hdr.hwndFrom = Request->Data.ShowDesktopRequest.DesktopWindow;
nmh.hdr.idFrom = 0;
nmh.hdr.code = PM_SHOW_DESKTOP;
nmh.ShowDesktop.Width = (int)Request->Data.ShowDesktopRequest.Width;
nmh.ShowDesktop.Height = (int)Request->Data.ShowDesktopRequest.Height;
Reply->Status = SendMessageW(Request->Data.ShowDesktopRequest.DesktopWindow,
PM_SHOW_DESKTOP,
0,
MAKELONG(Request->Data.ShowDesktopRequest.Width,
Request->Data.ShowDesktopRequest.Height))
WM_NOTIFY,
(WPARAM)nmh.hdr.hwndFrom,
(LPARAM)&nmh)
? STATUS_UNSUCCESSFUL : STATUS_SUCCESS;
return Reply->Status;
@ -270,13 +311,20 @@ CSR_API(CsrShowDesktop)
CSR_API(CsrHideDesktop)
{
PRIVATE_NOTIFY_DESKTOP nmh;
DPRINT("CsrHideDesktop\n");
Reply->Header.MessageSize = sizeof(CSRSS_API_REPLY);
Reply->Header.DataSize = sizeof(CSRSS_API_REPLY) - LPC_MESSAGE_BASE_SIZE;
nmh.hdr.hwndFrom = Request->Data.ShowDesktopRequest.DesktopWindow;
nmh.hdr.idFrom = 0;
nmh.hdr.code = PM_HIDE_DESKTOP;
Reply->Status = SendMessageW(Request->Data.ShowDesktopRequest.DesktopWindow,
PM_HIDE_DESKTOP, 0, 0)
WM_NOTIFY,
(WPARAM)nmh.hdr.hwndFrom,
(LPARAM)&nmh)
? STATUS_UNSUCCESSFUL : STATUS_SUCCESS;
return Reply->Status;