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 "HtmlHelpA"
  46 #else // ANSI
  47     typedef HWND ( WINAPI * HTMLHELP )( HWND, LPCWSTR, UINT, DWORD );
  48     #define HTMLHELP_NAME "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         wxPluginManager::UnloadLibrary( _T("HHCTRL.OCX") );
  84
  85         gs_htmlHelp = 0;
  86     }
  87 }
  88
  89 static HWND GetSuitableHWND()
  90 {
  91     if (wxTheApp->GetTopWindow())
  92         return (HWND) wxTheApp->GetTopWindow()->GetHWND();
  93     else
  94         return GetDesktopWindow();
  95 }
  96
  97 IMPLEMENT_DYNAMIC_CLASS(wxCHMHelpController, wxHelpControllerBase)
  98
  99 bool wxCHMHelpController::Initialize(const wxString& filename)
 100 {
 101     // warn on failure
 102     if( !LoadHtmlHelpLibrary() )
 103         return FALSE;
 104
 105     m_helpFile = filename;
 106     return TRUE;
 107 }
 108
 109 bool wxCHMHelpController::LoadFile(const wxString& file)
 110 {
 111     if (!file.IsEmpty())
 112         m_helpFile = file;
 113     return TRUE;
 114 }
 115
 116 bool wxCHMHelpController::DisplayContents()
 117 {
 118     if (m_helpFile.IsEmpty()) return FALSE;
 119
 120     wxString str = GetValidFilename(m_helpFile);
 121
 122     gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TOPIC, 0L);
 123     return TRUE;
 124 }
 125
 126 // Use topic or HTML filename
 127 bool wxCHMHelpController::DisplaySection(const wxString& section)
 128 {
 129     if (m_helpFile.IsEmpty()) return FALSE;
 130
 131     wxString str = GetValidFilename(m_helpFile);
 132
 133     // Is this an HTML file or a keyword?
 134     bool isFilename = (section.Find(wxT(".htm")) != -1);
 135
 136     if (isFilename)
 137         gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TOPIC, (DWORD) (const wxChar*) section);
 138     else
 139         KeywordSearch(section);
 140     return TRUE;
 141 }
 142
 143 // Use context number
 144 bool wxCHMHelpController::DisplaySection(int section)
 145 {
 146     if (m_helpFile.IsEmpty()) return FALSE;
 147
 148     wxString str = GetValidFilename(m_helpFile);
 149
 150     gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_HELP_CONTEXT, (DWORD)section);
 151     return TRUE;
 152 }
 153
 154 bool wxCHMHelpController::DisplayContextPopup(int contextId)
 155 {
 156     if (m_helpFile.IsEmpty()) return FALSE;
 157
 158     wxString str = GetValidFilename(m_helpFile);
 159
 160     // We also have to specify the popups file (default is cshelp.txt).
 161     // str += wxT("::/cshelp.txt");
 162
 163     HH_POPUP popup;
 164     popup.cbStruct = sizeof(popup);
 165     popup.hinst = (HINSTANCE) wxGetInstance();
 166     popup.idString = contextId ;
 167
 168     GetCursorPos(& popup.pt);
 169     popup.clrForeground = (COLORREF)-1;
 170     popup.clrBackground = (COLORREF)-1;
 171     popup.rcMargins.top = popup.rcMargins.left = popup.rcMargins.right = popup.rcMargins.bottom = -1;
 172     popup.pszFont = NULL;
 173     popup.pszText = NULL;
 174
 175     gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_DISPLAY_TEXT_POPUP, (DWORD) & popup);
 176     return TRUE;
 177 }
 178
 179 bool wxCHMHelpController::DisplayTextPopup(const wxString& text, const wxPoint& pos)
 180 {
 181     HH_POPUP popup;
 182     popup.cbStruct = sizeof(popup);
 183     popup.hinst = (HINSTANCE) wxGetInstance();
 184     popup.idString = 0 ;
 185     popup.pt.x = pos.x; popup.pt.y = pos.y;
 186     popup.clrForeground = (COLORREF)-1;
 187     popup.clrBackground = (COLORREF)-1;
 188     popup.rcMargins.top = popup.rcMargins.left = popup.rcMargins.right = popup.rcMargins.bottom = -1;
 189     popup.pszFont = NULL;
 190     popup.pszText = (const wxChar*) text;
 191
 192     gs_htmlHelp(GetSuitableHWND(), NULL, HH_DISPLAY_TEXT_POPUP, (DWORD) & popup);
 193     return TRUE;
 194 }
 195
 196 bool wxCHMHelpController::DisplayBlock(long block)
 197 {
 198     return DisplaySection(block);
 199 }
 200
 201 bool wxCHMHelpController::KeywordSearch(const wxString& k)
 202 {
 203     if (m_helpFile.IsEmpty()) return FALSE;
 204
 205     wxString str = GetValidFilename(m_helpFile);
 206
 207     HH_AKLINK link;
 208     link.cbStruct =     sizeof(HH_AKLINK) ;
 209     link.fReserved =    FALSE ;
 210     link.pszKeywords =  k.c_str() ;
 211     link.pszUrl =       NULL ;
 212     link.pszMsgText =   NULL ;
 213     link.pszMsgTitle =  NULL ;
 214     link.pszWindow =    NULL ;
 215     link.fIndexOnFail = TRUE ;
 216
 217     gs_htmlHelp(GetSuitableHWND(), (const wxChar*) str, HH_KEYWORD_LOOKUP, (DWORD)& link);
 218     return TRUE;
 219 }
 220
 221 bool wxCHMHelpController::Quit()
 222 {
 223     gs_htmlHelp(GetSuitableHWND(), 0, HH_CLOSE_ALL, 0L);
 224
 225     return TRUE;
 226 }
 227
 228 // Append extension if necessary.
 229 wxString wxCHMHelpController::GetValidFilename(const wxString& file) const
 230 {
 231     wxString path, name, ext;
 232     wxSplitPath(file, & path, & name, & ext);
 233
 234     wxString fullName;
 235     if (path.IsEmpty())
 236         fullName = name + wxT(".chm");
 237     else if (path.Last() == wxT('\\'))
 238         fullName = path + name + wxT(".chm");
 239     else
 240         fullName = path + wxT("\\") + name + wxT(".chm");
 241     return fullName;
 242 }
 243
 244 wxCHMHelpController::~wxCHMHelpController()
 245 {
 246     UnloadHtmlHelpLibrary();
 247 }
 248
 249 #endif // wxUSE_HELP
 250