fa482912e4
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6718 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
231 lines
9.1 KiB
TeX
231 lines
9.1 KiB
TeX
\section{\class{wxHelpController}}\label{wxhelpcontroller}
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This is a family of classes by which
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applications may invoke a help viewer to provide on-line help.
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A help controller allows an application to display help, at the contents
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or at a particular topic, and shut the help program down on termination.
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This avoids proliferation of many instances of the help viewer whenever the
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user requests a different topic via the application's menus or buttons.
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Typically, an application will create a help controller instance
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when it starts, and immediately call {\bf Initialize}\rtfsp
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to associate a filename with it. The help viewer will only get run, however,
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just before the first call to display something.
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Most help controller classes actually derive from wxHelpControllerBase and have
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names of the form wxXXXHelpController or wxHelpControllerXXX. An
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appropriate class is aliased to the name wxHelpController for each platform, as follows:
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\begin{itemize}\itemsep=0pt
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\item On Windows, wxWinHelpController is used.
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\item On all other platforms, wxHelpControllerHtml is used if wxHTML is
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compiled into wxWindows; otherwise wxExtHelpController is used (for invoking an external
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browser).
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\end{itemize}
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The remaining help controller classess need to be named
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explicitly by an application that wishes to make use of them.
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There are currently the following help controller classes defined:
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\begin{itemize}\itemsep=0pt
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\item wxWinHelpController, for controlling Windows Help.
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\item wxExtHelpController, for controlling external browsers under Unix.
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The default browser is Netscape Navigator. The 'help' sample shows its use.
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\item wxHelpControllerHtml, using \helpref{wxHTML}{wxhtml} to display help. See {\tt wx/helpwxht.h} for
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details of use.
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\item \helpref{wxHtmlHelpController}{wxhtmlhelpcontroller}, a more sophisticated help controller using \helpref{wxHTML}{wxhtml}, in
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a similar style to the Microsoft HTML Help viewer and using some of the same files.
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Although it has an API compatible with other help controllers, it has more advanced features, so it is
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recommended that you use the specific API for this class instead.
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\end{itemize}
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\wxheading{Derived from}
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wxHelpControllerBase\\
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/help.h> (wxWindows chooses the appropriate help controller class)\\
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<wx/helpbase.h> (wxHelpControllerBase class)\\
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<wx/helpwin.h> (Windows Help controller)\\
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<wx/generic/helpext.h> (external HTML browser controller)\\
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<wx/generic/helpwxht.h> (simple wxHTML-based help controller)\\
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<wx/html/helpctrl.h> (advanced wxHTML based help controller: wxHtmlHelpController)
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\wxheading{See also}
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\helpref{wxHtmlHelpController}{wxhtmlhelpcontroller}, \helpref{wxHTML}{wxhtml}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxHelpController::wxHelpController}
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\func{}{wxHelpController}{\void}
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Constructs a help instance object, but does not invoke the help viewer.
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\membersection{wxHelpController::\destruct{wxHelpController}}
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\func{}{\destruct{wxHelpController}}{\void}
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Destroys the help instance, closing down the viewer if it is running.
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\membersection{wxHelpController::Initialize}\label{wxhelpcontrollerinitialize}
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\func{virtual void}{Initialize}{\param{const wxString\& }{file}}
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\func{virtual void}{Initialize}{\param{const wxString\& }{file}, \param{int}{ server}}
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Initializes the help instance with a help filename, and optionally a server socket
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number if using wxHelp (now obsolete). Does not invoke the help viewer.
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This must be called directly after the help instance object is created and before
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any attempts to communicate with the viewer.
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You may omit the file extension and a suitable one will be chosen. For
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wxHtmlHelpController, the extensions zip, htb and hhp will be appended while searching for
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a suitable file. For WinHelp, the hlp extension is appended. For wxHelpControllerHtml (the
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standard HTML help controller), the filename is assumed to be a directory containing
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the HTML files.
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\membersection{wxHelpController::DisplayBlock}\label{wxhelpcontrollerdisplayblock}
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\func{virtual bool}{DisplayBlock}{\param{long}{ blockNo}}
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If the help viewer is not running, runs it and displays the file at the given block number.
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{\it WinHelp:} Refers to the context number.
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{\it External HTML help:} the same as for \helpref{wxHelpController::DisplaySection}{wxhelpcontrollerdisplaysection}.
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{\it wxHtmlHelpController:} {\it sectionNo} is an identifier as specified in the {\tt .hhc} file. See \helpref{Help files format}{helpformat}.
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\membersection{wxHelpController::DisplayContents}\label{wxhelpcontrollerdisplaycontents}
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\func{virtual bool}{DisplayContents}{\void}
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If the help viewer is not running, runs it and displays the
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contents.
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\membersection{wxHelpController::DisplaySection}\label{wxhelpcontrollerdisplaysection}
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\func{virtual bool}{DisplaySection}{\param{int}{ sectionNo}}
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If the help viewer is not running, runs it and displays the given section.
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{\it WinHelp:} {\it sectionNo} is a context id.
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{\it External HTML help/wxHTML based help:} wxExtHelpController and wxHelpControllerHtml implement {\it sectionNo} as an id in a map file, which is of the form:
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\begin{verbatim}
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0 wx.html ; Index
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1 wx34.html#classref ; Class reference
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2 wx204.html ; Function reference
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\end{verbatim}
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{\it wxHtmlHelpController:} {\it sectionNo} is an identifier as specified in the {\tt .hhc} file. See \helpref{Help files format}{helpformat}.
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\membersection{wxHelpController::GetFrameParameters}\label{wxhelpcontrollergetframeparameters}
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\func{virtual wxFrame *}{GetFrameParameters}{\param{const wxSize * }{size = NULL}, \param{const wxPoint * }{pos = NULL},
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\param{bool *}{newFrameEachTime = NULL}}
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This reads the current settings for the help frame in the case of the
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wxHelpControllerHtml, setting the frame size, position and
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the newFrameEachTime parameters to the last values used. It also
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returns the pointer to the last opened help frame. This can be used
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for example, to automatically close the help frame on program
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shutdown.
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wxHtmlHelpController returns the frame,
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size and position.
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For all other help controllers, this function does nothing
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and just returns NULL.
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\wxheading{Parameters}
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\docparam{viewer}{This defaults to "netscape" for wxExtHelpController.}
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\docparam{flags}{This defaults to wxHELP\_NETSCAPE for wxExtHelpController, indicating
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that the viewer is a variant of Netscape Navigator.}
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\membersection{wxHelpController::KeywordSearch}\label{wxhelpcontrollerkeywordsearch}
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\func{virtual bool}{KeywordSearch}{\param{const wxString\& }{keyWord}}
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If the help viewer is not running, runs it, and searches for sections matching the given keyword. If one
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match is found, the file is displayed at this section.
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{\it WinHelp:} If more than one match is found,
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the first topic is displayed.
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{\it External HTML help:} If more than one match is found,
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a choice of topics is displayed.
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{\it wxHtmlHelpController:} see \helpref{wxHtmlHelpController::KeywordSearch}{wxhtmlhelpcontrollerkeywordsearch}.
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\membersection{wxHelpController::LoadFile}\label{wxhelpcontrollerloadfile}
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\func{virtual bool}{LoadFile}{\param{const wxString\& }{file = ""}}
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If the help viewer is not running, runs it and loads the given file.
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If the filename is not supplied or is
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empty, the file specified in {\bf Initialize} is used. If the viewer is
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already displaying the specified file, it will not be reloaded. This
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member function may be used before each display call in case the user
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has opened another file.
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wxHtmlHelpController ignores this call.
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\membersection{wxHelpController::OnQuit}\label{wxhelpcontrolleronquit}
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\func{virtual bool}{OnQuit}{\void}
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Overridable member called when this application's viewer is quit by the user.
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This does not work for all help controllers.
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\membersection{wxHelpController::SetFrameParameters}\label{wxhelpcontrollersetframeparameters}
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\func{virtual void}{SetFrameParameters}{\param{const wxString \& }{title},
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\param{const wxSize \& }{size}, \param{const wxPoint \& }{pos = wxDefaultPosition},
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\param{bool }{newFrameEachTime = FALSE}}
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For wxHelpControllerHtml, this allows the application to set the
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default frame title, size and position for the frame. If the title
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contains \%s, this will be replaced with the page title. If the
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parameter newFrameEachTime is set, the controller will open a new
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help frame each time it is called.
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For wxHtmlHelpController, the title is set (again with \%s indicating the
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page title) and also the size and position of the frame if the frame is already
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open. {\it newFrameEachTime} is ignored.
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For all other help controllers this function has no effect.
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\membersection{wxHelpController::SetViewer}\label{wxhelpcontrollersetviewer}
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\func{virtual void}{SetViewer}{\param{const wxString\& }{viewer}, \param{long}{ flags}}
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Sets detailed viewer information. So far this is only relevant to wxExtHelpController.
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Some examples of usage:
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\begin{verbatim}
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m_help.SetViewer("kdehelp");
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m_help.SetViewer("gnome-help-browser");
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m_help.SetViewer("netscape", wxHELP_NETSCAPE);
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\end{verbatim}
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\membersection{wxHelpController::Quit}\label{wxhelpcontrollerquit}
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\func{virtual bool}{Quit}{\void}
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If the viewer is running, quits it by disconnecting.
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For Windows Help, the viewer will only close if no other application is using it.
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