home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Tricks of the Windows Gam…ming Gurus (2nd Edition)
/
Disc2.iso
/
vc98
/
mfc
/
src
/
winfrmx.cpp
< prev
next >
Wrap
C/C++ Source or Header
|
1998-06-16
|
11KB
|
406 lines
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
#include "stdafx.h"
#ifdef AFX_CORE3_SEG
#pragma code_seg(AFX_CORE3_SEG)
#endif
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// Basic Help support
void CWnd::OnHelp() // use context to derive help context
{
// attempt to get help from whoever is tracking
HWND hWnd = ::GetCapture();
while (hWnd != NULL)
{
// attempt to process help
if (::SendMessage(hWnd, WM_COMMANDHELP, 0, 0))
return;
// check next parent/owner in the parent/owner chain
hWnd = AfxGetParentOwner(hWnd);
}
// attempt to get help from whoever has the focus
hWnd = ::GetFocus();
while (hWnd != NULL)
{
// attempt to process help
if (::SendMessage(hWnd, WM_COMMANDHELP, 0, 0))
return;
// check next parent/owner in the parent/owner chain
hWnd = AfxGetParentOwner(hWnd);
}
// attempt to get help from the active window
CWnd* pWnd = GetTopLevelParent();
hWnd = ::GetLastActivePopup(pWnd->GetSafeHwnd());
while (hWnd != NULL)
{
// attempt to process help
if (::SendMessage(hWnd, WM_COMMANDHELP, 0, 0))
return;
// check next parent/owner in the parent/owner chain
hWnd = AfxGetParentOwner(hWnd);
}
// No context available, bring up default.
SendMessage(WM_COMMAND, ID_DEFAULT_HELP);
}
void CFrameWnd::OnHelp()
{
// Be careful not call WinHelp when the error is failing to lauch help
if (m_dwPromptContext != 0)
{
if (m_dwPromptContext != HID_BASE_PROMPT+AFX_IDP_FAILED_TO_LAUNCH_HELP)
AfxGetApp()->WinHelp(m_dwPromptContext);
return;
}
CWnd::OnHelp();
}
void CWnd::OnHelpIndex()
{
AfxGetApp()->WinHelp(0L, HELP_INDEX);
}
void CWnd::OnHelpFinder()
{
AfxGetApp()->WinHelp(0L, HELP_FINDER);
}
void CWnd::OnHelpUsing()
{
AfxGetApp()->WinHelp(0L, HELP_HELPONHELP);
}
/////////////////////////////////////////////////////////////////////////////
// Context Help Mode support
BOOL CFrameWnd::CanEnterHelpMode()
{
ASSERT(m_bHelpMode != HELP_ACTIVE); // already in help mode?
// unable to start help if the cursor cannot be loaded from the resources
if (afxData.hcurHelp == NULL)
{
afxData.hcurHelp = ::LoadCursor(NULL, IDC_HELP);
if (afxData.hcurHelp == NULL)
{
// load help cursor after handles have been setup
HINSTANCE hInst = AfxFindResourceHandle(
MAKEINTRESOURCE(AFX_IDC_CONTEXTHELP), RT_GROUP_CURSOR);
afxData.hcurHelp = LoadCursor(hInst,
MAKEINTRESOURCE(AFX_IDC_CONTEXTHELP));
}
if (afxData.hcurHelp == NULL)
return FALSE;
}
// return TRUE if there is a handler for ID_CONTEXT_HELP
AFX_CMDHANDLERINFO info;
return OnCmdMsg(ID_CONTEXT_HELP, CN_COMMAND, NULL, &info);
}
void CFrameWnd::OnContextHelp()
{
// don't enter twice, and don't enter if initialization fails
if (m_bHelpMode == HELP_ACTIVE || !CanEnterHelpMode())
return;
// don't enter help mode with pending WM_EXITHELPMODE message
MSG msg;
if (PeekMessage(&msg, m_hWnd, WM_EXITHELPMODE, WM_EXITHELPMODE,
PM_REMOVE|PM_NOYIELD))
{
return;
}
BOOL bHelpMode = m_bHelpMode;
ASSERT(m_bHelpMode == HELP_INACTIVE || m_bHelpMode == HELP_ENTERING);
m_bHelpMode = HELP_ACTIVE;
#ifndef _AFX_NO_OLE_SUPPORT
// allow any in-place active servers to go into help mode
if (bHelpMode != HELP_ENTERING && m_pNotifyHook != NULL &&
!m_pNotifyHook->OnContextHelp(TRUE))
{
TRACE0("Error: an in-place server failed to enter context help mode.\n");
m_pNotifyHook->OnContextHelp(FALSE); // undo partial help mode
m_bHelpMode = HELP_INACTIVE;
return;
}
#endif
if (bHelpMode == HELP_INACTIVE)
{
// need to delay help startup until later
PostMessage(WM_COMMAND, ID_CONTEXT_HELP);
m_bHelpMode = HELP_ENTERING;
return;
}
ASSERT(m_bHelpMode == HELP_ACTIVE);
// display special help mode message on status bar
UINT nMsgSave = (UINT)SendMessage(WM_SETMESSAGESTRING,
(WPARAM)AFX_IDS_HELPMODEMESSAGE);
if (nMsgSave == 0)
nMsgSave = AFX_IDS_IDLEMESSAGE;
DWORD dwContext = 0;
POINT point;
GetCursorPos(&point);
SetHelpCapture(point, NULL);
LONG lIdleCount = 0;
CWinApp* pApp = AfxGetApp();
while (m_bHelpMode)
{
if (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE))
{
if (!ProcessHelpMsg(msg, &dwContext))
break;
ASSERT(dwContext == 0);
}
else if (!pApp->OnIdle(lIdleCount++))
{
lIdleCount = 0;
WaitMessage();
}
}
m_bHelpMode = HELP_INACTIVE;
ReleaseCapture();
// make sure the cursor is set appropriately
SetCapture();
ReleaseCapture();
// restore original status bar text
SendMessage(WM_SETMESSAGESTRING, (WPARAM)nMsgSave);
#ifndef _AFX_NO_OLE_SUPPORT
// tell in-place servers to exit Shift+F1 help mode
if (m_pNotifyHook != NULL)
m_pNotifyHook->OnContextHelp(FALSE);
#endif
if (dwContext != 0)
{
if (dwContext == -1)
SendMessage(WM_COMMAND, ID_DEFAULT_HELP);
else
pApp->WinHelp(dwContext);
}
PostMessage(WM_KICKIDLE); // trigger idle update
}
/////////////////////////////////////////////////////////////////////////////
// OnContextHelp helpers.
HWND CFrameWnd::SetHelpCapture(POINT point, BOOL* pbDescendant)
// set or release capture, depending on where the mouse is
// also assign the proper cursor to be displayed.
{
if (!m_bHelpMode)
return NULL;
HWND hWndCapture = ::GetCapture();
CWnd* pWndHit = WindowFromPoint(point);
HWND hWndHit = pWndHit->GetSafeHwnd();
CWnd* pTopHit = pWndHit->GetTopLevelParent();
CWnd* pTopActive = GetActiveWindow()->GetTopLevelParent();
BOOL bDescendant = FALSE;
HTASK hCurTask = (HTASK)GetCurrentThreadId();
HTASK hTaskHit = hWndHit != NULL ? ::GetWindowTask(hWndHit) : NULL;
if (pTopActive == NULL || hWndHit == ::GetDesktopWindow())
{
if (hWndCapture == m_hWnd)
ReleaseCapture();
SetCursor(afxData.hcurArrow);
}
else if (pTopActive == NULL ||
hWndHit == NULL || hCurTask != hTaskHit ||
!AfxIsDescendant(m_hWnd, hWndHit))
{
if (hCurTask != hTaskHit)
hWndHit = NULL;
if (hWndCapture == m_hWnd)
ReleaseCapture();
}
else
{
bDescendant = TRUE;
if (pTopActive != pTopHit)
hWndHit = NULL;
else
{
if (hWndCapture != m_hWnd)
::SetCapture(m_hWnd);
SetCursor(afxData.hcurHelp);
}
}
if (pbDescendant != NULL)
*pbDescendant = bDescendant;
return hWndHit;
}
AFX_STATIC DWORD AFXAPI _AfxMapClientArea(HWND hWnd, POINT point)
{
DWORD dwContext;
do
{
ASSERT(::IsWindow(hWnd));
// check current window
::ScreenToClient(hWnd, &point);
dwContext = ::SendMessage(hWnd, WM_HELPHITTEST, 0,
MAKELONG(point.x, point.y));
::ClientToScreen(hWnd, &point);
// don't use owner's of popup windows, just child/parent relationship
if ((GetWindowLong(hWnd, GWL_STYLE) & WS_CHILD) == 0)
break;
// check parent window
hWnd = ::GetParent(hWnd);
}
while (hWnd && dwContext == 0);
return dwContext == 0 ? -1 : dwContext;
}
AFX_STATIC DWORD AFXAPI _AfxMapNonClientArea(int iHit)
{
ASSERT(iHit != HTCLIENT);
if (iHit < 0 || iHit > HTHELP)
return (DWORD)-1;
return HID_BASE_NCAREAS+iHit;
}
BOOL CFrameWnd::ProcessHelpMsg(MSG& msg, DWORD* pContext)
{
ASSERT(pContext != NULL);
if (msg.message == WM_EXITHELPMODE ||
(msg.message == WM_KEYDOWN && msg.wParam == VK_ESCAPE))
{
PeekMessage(&msg, NULL, msg.message, msg.message, PM_REMOVE);
return FALSE;
}
CPoint point;
if ((msg.message >= WM_MOUSEFIRST && msg.message <= WM_MOUSELAST) ||
(msg.message >= WM_NCMOUSEFIRST && msg.message <= WM_NCMOUSELAST))
{
BOOL bDescendant;
HWND hWndHit = SetHelpCapture(msg.pt, &bDescendant);
if (hWndHit == NULL)
return TRUE;
if (bDescendant)
{
if (msg.message != WM_LBUTTONDOWN)
{
// Hit one of our owned windows -- eat the message.
PeekMessage(&msg, NULL, msg.message, msg.message, PM_REMOVE);
return TRUE;
}
int iHit = (int)::SendMessage(hWndHit, WM_NCHITTEST, 0,
MAKELONG(msg.pt.x, msg.pt.y));
if (iHit == HTMENU || iHit == HTSYSMENU)
{
ASSERT(::GetCapture() == m_hWnd);
ReleaseCapture();
// the message we peeked changes into a non-client because
// of the release capture.
GetMessage(&msg, NULL, WM_NCLBUTTONDOWN, WM_NCLBUTTONDOWN);
DispatchMessage(&msg);
GetCursorPos(&point);
SetHelpCapture(point, NULL);
}
else if (iHit == HTCLIENT)
{
*pContext = _AfxMapClientArea(hWndHit, msg.pt);
PeekMessage(&msg, NULL, msg.message, msg.message, PM_REMOVE);
return FALSE;
}
else
{
*pContext = _AfxMapNonClientArea(iHit);
PeekMessage(&msg, NULL, msg.message, msg.message, PM_REMOVE);
return FALSE;
}
}
else
{
// Hit one of our apps windows (or desktop) -- dispatch the message.
PeekMessage(&msg, NULL, msg.message, msg.message, PM_REMOVE);
// Dispatch mouse messages that hit the desktop!
DispatchMessage(&msg);
}
}
else if (msg.message == WM_SYSCOMMAND ||
(msg.message >= WM_KEYFIRST && msg.message <= WM_KEYLAST))
{
if (::GetCapture() != NULL)
{
ReleaseCapture();
MSG msg;
while (PeekMessage(&msg, NULL, WM_MOUSEFIRST,
WM_MOUSELAST, PM_REMOVE|PM_NOYIELD));
}
if (PeekMessage(&msg, NULL, msg.message, msg.message, PM_NOREMOVE))
{
GetMessage(&msg, NULL, msg.message, msg.message);
if (!PreTranslateMessage(&msg))
{
TranslateMessage(&msg);
if (msg.message == WM_SYSCOMMAND ||
(msg.message >= WM_SYSKEYFIRST &&
msg.message <= WM_SYSKEYLAST))
{
// only dispatch system keys and system commands
ASSERT(msg.message == WM_SYSCOMMAND ||
(msg.message >= WM_SYSKEYFIRST &&
msg.message <= WM_SYSKEYLAST));
DispatchMessage(&msg);
}
}
}
GetCursorPos(&point);
SetHelpCapture(point, NULL);
}
else
{
// allow all other messages to go through (capture still set)
if (PeekMessage(&msg, NULL, msg.message, msg.message, PM_REMOVE))
DispatchMessage(&msg);
}
return TRUE;
}
/////////////////////////////////////////////////////////////////////////////