src/msw/helpchm.cpp

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