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|
/*++
Module Name:
help.c
Abstract:
Author:
Jaime Sasson - 10-Aug-1993
Environment:
ULIB, Windows
--*/
#include "precomp.h"
#pragma hdrstop
//
// Global variables used in the module
//
HHOOK _hHook;
INT _HelpContext;
WCHAR _HelpFile[ MAX_PATH + 1 ];
LRESULT
HelpHookProc(
IN INT nCode,
IN WPARAM wParam,
IN LPARAM lParam
)
/*++
Routine Description:
Hook proc to detect F1 key presses.
Arguments:
Standard arguments of a hook procedure.
Return Value:
--*/
{
PMSG pmsg = (PMSG)lParam;
if(nCode < 0) {
return( CallNextHookEx( _hHook, nCode, wParam, lParam ) );
}
if(((nCode == MSGF_DIALOGBOX) || (nCode == MSGF_MENU))
&& (pmsg->message == WM_KEYDOWN)
&& (LOWORD(pmsg->wParam) == VK_F1))
{
PostMessage( _hWndMain, AP_HELP_KEY, nCode, 0);
return(TRUE);
}
return(FALSE);
}
BOOLEAN
InitializeHelp(
IN PCWSTR HelpFile
)
/*++
Routine Description:
Initialize the help module by initializing its global data.
Arguments:
HelpFile - Name of the help file to be invoked.
Return Value:
BOOLEAN - Returns TRUE if the initialization succeeded.
returns FALSE otherwise.
--*/
{
wcscpy( _HelpFile, HelpFile );
_hHook = SetWindowsHookEx( WH_MSGFILTER,
HelpHookProc,
NULL,
GetCurrentThreadId() );
if( _hHook == NULL ) {
return( FALSE );
}
return( TRUE );
}
VOID
CleanUpHelp(
)
/*++
Routine Description:
Clean up the HELP object, by unhooking HelpHookProc.
Arguments:
None.
Return Value:
None.
--*/
{
UnhookWindowsHookEx( _hHook );
}
VOID
DisplayHelp(
)
/*++
Routine Description:
Display context-sensitive help.
Arguments:
None.
Return Value:
BOOLEAN - Returns TRUE if the operation succeeds. Otherwise, return FALSE.
--*/
{
if( _HelpContext != IDH_NONE ) {
WinHelp( _hWndMain,
_HelpFile,
(UINT)HELP_CONTEXT,
_HelpContext );
DrawMenuBar( _hWndMain );
}
}
VOID
DisplayHelpIndex(
)
/*++
Routine Description:
Invoke winhelp to display the help file index.
Arguments:
None.
Return Value:
None.
--*/
{
WinHelp( _hWndMain, _HelpFile, (UINT)HELP_INDEX, 0 );
}
VOID
DisplayHelpOnHelp(
)
/*++
Routine Description:
Invoke winhelp to display help on help.
Arguments:
None.
Return Value:
None.
--*/
{
WinHelp( _hWndMain, _HelpFile, (UINT)HELP_HELPONHELP, 0 );
}
VOID
DisplayHelpSearch(
)
/*++
Routine Description:
Invoke winhelp so that it prompt the user to enter a key.
Arguments:
None.
Return Value:
None.
--*/
{
WinHelp( _hWndMain, _HelpFile, (UINT)HELP_PARTIALKEY, (DWORD)"" );
}
VOID
QuitHelp(
)
/*++
Routine Description:
Inform winhelp that help is no more needed.
Arguments:
None.
Return Value:
None.
--*/
{
WinHelp( _hWndMain, _HelpFile, (UINT)HELP_QUIT, 0 );
}
INT
GetHelpContext(
)
/*++
Routine Description:
Return the current help context.
Arguments:
None.
Return Value:
INT - Ireturns the current help id.
--*/
{
return( _HelpContext );
}
VOID
SetHelpContext(
IN INT HelpId
)
/*++
Routine Description:
Set the current help context.
Arguments:
HelpContext - Help context id.
Return Value:
None.
--*/
{
_HelpContext = HelpId;
}
VOID
SetMenuItemHelpContext(
IN WPARAM wParam,
IN LPARAM lParam
)
/*++
Routine Description:
Routine to set help context based on which menu item is currently
selected.
Arguments:
wParam,lParam - params to window proc in WM_MENUSELECT case
Return Value:
None.
--*/
{
if(HIWORD(lParam) == 0) { // menu closed
SetHelpContext( IDH_SAVE_REPAIR_INFO );
} else if (HIWORD(wParam) & MF_POPUP) { // popup selected
SetHelpContext( IDH_NONE );
} else if (HIWORD(wParam) & MF_SYSMENU) { // system menu
SetHelpContext( IDH_SYSTEM_MENU );
} else { // regular old menu item
SetHelpContext( IDH_NONE );
}
}
|
