src/msw/helpchm.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        helpchm.cpp
   3 // Purpose:     Help system: MS HTML Help implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     16/04/2000
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13     #pragma implementation "helpchm.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20     #pragma hdrstop
  21 #endif
  22
  23 #if wxUSE_HELP && wxUSE_MS_HTML_HELP && defined(__WIN95__)
  24
  25 #include "wx/filefn.h"
  26 #include "wx/msw/helpchm.h"
  27
  28 #include "wx/dynlib.h"
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/intl.h"
  32     #include "wx/app.h"
  33 #endif
  34
  35 #include "wx/msw/private.h"
  36 #include "wx/msw/missing.h"
  37
  38 // ----------------------------------------------------------------------------
  39 // utility functions to manage the loading/unloading
  40 // of hhctrl.ocx
  41 // ----------------------------------------------------------------------------
  42
  43 #ifndef UNICODE
  44     typedef HWND ( WINAPI * HTMLHELP )( HWND, LPCSTR, UINT, DWORD );
  45     #define HTMLHELP_NAME wxT("HtmlHelpA")
  46 #else // ANSI
  47     typedef HWND ( WINAPI * HTMLHELP )( HWND, LPCWSTR, UINT, DWORD );
  48     #define HTMLHELP_NAME wxT("HtmlHelpW")
  49 #endif
  50
  51 // dll symbol handle
  52 static HTMLHELP gs_htmlHelp = 0;
  53
  54 static bool LoadHtmlHelpLibrary()
  55 {
  56     wxPluginLibrary *lib = wxPluginManager::LoadLibrary( _T("HHCTRL.OCX"), wxDL_DEFAULT | wxDL_VERBATIM );
  57
  58     if( !lib )
  59     {
  60         wxLogError(_("MS HTML Help functions are unavailable because the MS HTML Help library is not installed on this machine. Please install it."));
  61         return FALSE;
  62     }
  63     else
  64     {
  65         gs_htmlHelp = (HTMLHELP)lib->GetSymbol( HTMLHELP_NAME );
  66
  67         if( !gs_htmlHelp )
  68         {
  69             wxLogError(_("Failed to initialize MS HTML Help."));
  70
  71             lib->UnrefLib();
  72             return FALSE ;
  73         }
  74     }
  75
  76     return TRUE;
  77 }
  78
  79 static void UnloadHtmlHelpLibrary()
  80 {
  81     if ( gs_htmlHelp )
  82     {
  83         if (wxPluginManager::UnloadLibrary( _T("HHCTRL.OCX") ))
  84             gs_htmlHelp = 0;
  85     }
  86 }
  87
  88 static HWND GetSuitableHWND()
  89 {
  90     if (wxTheApp->GetTopWindow())
  91         return (HWND) wxTheApp->GetTopWindow()->GetHWND();
  92     else
  93         return GetDesktopWindow();
  94 }
  95
  96 IMPLEMENT_DYNAMIC_CLASS(wxCHMHelpController, wxHelpControllerBase)
  97
  98 bool wxCHMHelpController::Initialize(const wxString& filename)
  99 {
 100     // warn on failure
 101     if( !LoadHtmlHelpLibrary() )
 102         return FALSE;
 103
 104     m_helpFile = filename;
 105     return TRUE;
 106 }
 107
 108 bool wxCHMHelpController::LoadFile(const wxString& file)
 109 {
 110     if (!file.IsEmpty())
 111         m_helpFile = file;
 112     return TRUE;
 113 }
 114
 115 bool wxCHMHelpController::DisplayContents()
 116 {
 117     if (m_helpFile.IsEmpty()) return FALSE;
 118
 119     wxString str = GetValidFilename(m_helpFile);
 120
 121     gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TOPIC, 0L);
 122     return TRUE;
 123 }
 124
 125 // Use topic or HTML filename
 126 bool wxCHMHelpController::DisplaySection(const wxString& section)
 127 {
 128     if (m_helpFile.IsEmpty()) return FALSE;
 129
 130     wxString str = GetValidFilename(m_helpFile);
 131
 132     // Is this an HTML file or a keyword?
 133     bool isFilename = (section.Find(wxT(".htm")) != -1);
 134
 135     if (isFilename)
 136         gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TOPIC, (DWORD) (const wxChar*) section);
 137     else
 138         KeywordSearch(section);
 139     return TRUE;
 140 }
 141
 142 // Use context number
 143 bool wxCHMHelpController::DisplaySection(int section)
 144 {
 145     if (m_helpFile.IsEmpty()) return FALSE;
 146
 147     wxString str = GetValidFilename(m_helpFile);
 148
 149     gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_HELP_CONTEXT, (DWORD)section);
 150     return TRUE;
 151 }
 152
 153 bool wxCHMHelpController::DisplayContextPopup(int contextId)
 154 {
 155     if (m_helpFile.IsEmpty()) return FALSE;
 156
 157     wxString str = GetValidFilename(m_helpFile);
 158
 159     // We also have to specify the popups file (default is cshelp.txt).
 160     // str += wxT("::/cshelp.txt");
 161
 162     HH_POPUP popup;
 163     popup.cbStruct = sizeof(popup);
 164     popup.hinst = (HINSTANCE) wxGetInstance();
 165     popup.idString = contextId ;
 166
 167     GetCursorPos(& popup.pt);
 168     popup.clrForeground = (COLORREF)-1;
 169     popup.clrBackground = (COLORREF)-1;
 170     popup.rcMargins.top = popup.rcMargins.left = popup.rcMargins.right = popup.rcMargins.bottom = -1;
 171     popup.pszFont = NULL;
 172     popup.pszText = NULL;
 173
 174     gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TEXT_POPUP, (DWORD) & popup);
 175     return TRUE;
 176 }
 177
 178 bool wxCHMHelpController::DisplayTextPopup(const wxString& text, const wxPoint& pos)
 179 {
 180     HH_POPUP popup;
 181     popup.cbStruct = sizeof(popup);
 182     popup.hinst = (HINSTANCE) wxGetInstance();
 183     popup.idString = 0 ;
 184     popup.pt.x = pos.x; popup.pt.y = pos.y;
 185     popup.clrForeground = (COLORREF)-1;
 186     popup.clrBackground = (COLORREF)-1;
 187     popup.rcMargins.top = popup.rcMargins.left = popup.rcMargins.right = popup.rcMargins.bottom = -1;
 188     popup.pszFont = NULL;
 189     popup.pszText = (const wxChar*) text;
 190
 191     gs_htmlHelp(GetSuitableHWND(), NULL, HH_DISPLAY_TEXT_POPUP, (DWORD) & popup);
 192     return TRUE;
 193 }
 194
 195 bool wxCHMHelpController::DisplayBlock(long block)
 196 {
 197     return DisplaySection(block);
 198 }
 199
 200 bool wxCHMHelpController::KeywordSearch(const wxString& k)
 201 {
 202     if (m_helpFile.IsEmpty()) return FALSE;
 203
 204     wxString str = GetValidFilename(m_helpFile);
 205
 206     HH_AKLINK link;
 207     link.cbStruct =     sizeof(HH_AKLINK) ;
 208     link.fReserved =    FALSE ;
 209     link.pszKeywords =  k.c_str() ;
 210     link.pszUrl =       NULL ;
 211     link.pszMsgText =   NULL ;
 212     link.pszMsgTitle =  NULL ;
 213     link.pszWindow =    NULL ;
 214     link.fIndexOnFail = TRUE ;
 215
 216     gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_KEYWORD_LOOKUP, (DWORD)& link);
 217     return TRUE;
 218 }
 219
 220 bool wxCHMHelpController::Quit()
 221 {
 222     gs_htmlHelp(GetSuitableHWND(), 0, HH_CLOSE_ALL, 0L);
 223
 224     return TRUE;
 225 }
 226
 227 // Append extension if necessary.
 228 wxString wxCHMHelpController::GetValidFilename(const wxString& file) const
 229 {
 230     wxString path, name, ext;
 231     wxSplitPath(file, & path, & name, & ext);
 232
 233     wxString fullName;
 234     if (path.IsEmpty())
 235         fullName = name + wxT(".chm");
 236     else if (path.Last() == wxT('\\'))
 237         fullName = path + name + wxT(".chm");
 238     else
 239         fullName = path + wxT("\\") + name + wxT(".chm");
 240     return fullName;
 241 }
 242
 243 wxCHMHelpController::~wxCHMHelpController()
 244 {
 245     UnloadHtmlHelpLibrary();
 246 }
 247
 248 #endif // wxUSE_HELP
 249