+                    return false;
+            }
+        }
+    }
+    return AddBook(wxFileName(actualFilename));
+}
+
+bool wxHtmlHelpController::LoadFile(const wxString& WXUNUSED(file))
+{
+    // Don't reload the file or we'll have it appear again, presumably.
+    return true;
+}
+
+bool wxHtmlHelpController::DisplaySection(int sectionNo)
+{
+    return Display(sectionNo);
+}
+
+bool wxHtmlHelpController::DisplayTextPopup(const wxString& text, const wxPoint& WXUNUSED(pos))
+{
+#if wxUSE_TIPWINDOW
+    static wxTipWindow* s_tipWindow = NULL;
+
+    if (s_tipWindow)
+    {
+        // Prevent s_tipWindow being nulled in OnIdle,
+        // thereby removing the chance for the window to be closed by ShowHelp
+        s_tipWindow->SetTipWindowPtr(NULL);
+        s_tipWindow->Close();
+    }
+    s_tipWindow = NULL;
+
+    if ( !text.empty() )
+    {
+        s_tipWindow = new wxTipWindow(wxTheApp->GetTopWindow(), text, 100, & s_tipWindow);
+
+        return true;
+    }
+#else
+    wxUnusedVar(text);
+#endif // wxUSE_TIPWINDOW
+
+    return false;
+}
+
+void wxHtmlHelpController::SetFrameParameters(const wxString& title,
+                                   const wxSize& size,
+                                   const wxPoint& pos,
+                                   bool WXUNUSED(newFrameEachTime))
+{
+    SetTitleFormat(title);
+    if (m_helpFrame)
+    {
+        m_helpFrame->SetSize(pos.x, pos.y, size.x, size.y);
+    }
+}
+
+wxFrame* wxHtmlHelpController::GetFrameParameters(wxSize *size,
+                                   wxPoint *pos,
+                                   bool *newFrameEachTime)
+{
+    if (newFrameEachTime)
+        (* newFrameEachTime) = false;
+    if (size && m_helpFrame)
+        (* size) = m_helpFrame->GetSize();
+    if (pos && m_helpFrame)
+        (* pos) = m_helpFrame->GetPosition();
+    return m_helpFrame;
+}
+
+bool wxHtmlHelpController::Quit()
+{
+    DestroyHelpWindow();
+    return true;
+}
+
+// Make the help controller's frame 'modal' if
+// needed
+void wxHtmlHelpController::AddGrabIfNeeded()
+{
+    // So far, wxGTK only
+#ifdef __WXGTK__
+    bool needGrab = false;
+
+    // Check if there are any modal windows present,
+    // in which case we need to add a grab.
+    for ( wxWindowList::compatibility_iterator node = wxTopLevelWindows.GetFirst();
+          node;
+          node = node->GetNext() )
+    {
+        wxWindow *win = node->GetData();
+        wxDialog *dialog = wxDynamicCast(win, wxDialog);
+
+        if (dialog && dialog->IsModal())
+            needGrab = true;
+    }
+
+    if (needGrab && m_helpFrame)
+        m_helpFrame->AddGrab();
+#endif // __WXGTK__
+}
+
+bool wxHtmlHelpController::Display(const wxString& x)
+{
+    CreateHelpWindow();
+    bool success = m_helpFrame->Display(x);
+    AddGrabIfNeeded();
+    return success;
+}
+
+bool wxHtmlHelpController::Display(int id)
+{
+    CreateHelpWindow();
+    bool success = m_helpFrame->Display(id);
+    AddGrabIfNeeded();
+    return success;
+}
+
+bool wxHtmlHelpController::DisplayContents()
+{
+    CreateHelpWindow();
+    bool success = m_helpFrame->DisplayContents();
+    AddGrabIfNeeded();
+    return success;
+}
+
+bool wxHtmlHelpController::DisplayIndex()
+{
+    CreateHelpWindow();
+    bool success = m_helpFrame->DisplayIndex();
+    AddGrabIfNeeded();
+    return success;
+}
+
+bool wxHtmlHelpController::KeywordSearch(const wxString& keyword,
+                                         wxHelpSearchMode mode)
+{
+    CreateHelpWindow();
+    bool success = m_helpFrame->KeywordSearch(keyword, mode);
+    AddGrabIfNeeded();
+    return success;
+}
+
+#endif // wxUSE_WXHTML_HELP
+