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[wxWidgets.git] / docs / latex / wx / dirtrav.tex

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Name:        dirtrav.tex
%% Purpose:     wxDirTraverser documentation
%% Author:      Vadim Zeitlin
%% Modified by:
%% Created:     14.01.02 (extracted from dir.tex)
%% RCS-ID:      $Id$
%% Copyright:   (c) Vadim Zeitlin
%% License:     wxWidgets license
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\section{\class{wxDirTraverser}}\label{wxdirtraverser}

wxDirTraverser is an abstract interface which must be implemented by objects
passed to \helpref{Traverse}{wxdirtraverse} function.

Example of use (this works almost like \helpref{GetAllFiles}{wxdirgetallfiles}):

\begin{verbatim}
    class wxDirTraverserSimple : public wxDirTraverser
    {
    public:
        wxDirTraverserSimple(wxArrayString& files) : m_files(files) { }

        virtual wxDirTraverseResult OnFile(const wxString& filename)
        {
            m_files.Add(filename);
            return wxDIR_CONTINUE;
        }

        virtual wxDirTraverseResult OnDir(const wxString& WXUNUSED(dirname))
        {
            return wxDIR_CONTINUE;
        }

    private:
        wxArrayString& m_files;
    };

    // get the names of all files in the array
    wxArrayString files;
    wxDirTraverserSimple traverser(files);

    wxDir dir(dirname);
    dir.Traverse(traverser);
\end{verbatim}

\wxheading{Derived from}

No base class

\wxheading{Constants}

The elements of {\tt wxDirTraverseResult} are the possible return values of the
callback functions:

{\small
\begin{verbatim}
enum wxDirTraverseResult
{
    wxDIR_IGNORE = -1,      // ignore this directory but continue with others
    wxDIR_STOP,             // stop traversing
    wxDIR_CONTINUE          // continue into this directory
};
\end{verbatim}
}

\wxheading{Include files}

<wx/dir.h>

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxDirTraverser::OnDir}\label{wxdirtraverserondir}

\func{virtual wxDirTraverseResult}{OnDir}{\param{const wxString\& }{dirname}}

This function is called for each directory. It may return {\tt wxSIR\_STOP} 
to abort traversing completely, {\tt wxDIR\_IGNORE} to skip this directory but
continue with others or {\tt wxDIR\_CONTINUE} to enumerate all files and
subdirectories in this directory.

This is a pure virtual function and must be implemented in the derived class.

\membersection{wxDirTraverser::OnFile}\label{wxdirtraverseronfile}

\func{virtual wxDirTraverseResult}{OnFile}{\param{const wxString\& }{filename}}

This function is called for each file. It may return {\tt wxDIR\_STOP} to abort
traversing (for example, if the file being searched is found) or 
{\tt wxDIR\_CONTINUE} to proceed.

This is a pure virtual function and must be implemented in the derived class.

\membersection{wxOpenErrorTraverser::OnOpenError}\label{wxopenerrortraverseronopenerror}

\func{virtual wxOpenErrorTraverseResult}{OnOpenError}{\param{const wxString\& }{openerrorname}}

This function is called for each directory which we failed to open for
enumerating. It may return {\tt wxSIR\_STOP} to abort traversing completely,
{\tt wxDIR\_IGNORE} to skip this directory but continue with others or 
{\tt wxDIR\_CONTINUE} to retry opening this directory once again.

The base class version always returns {\tt wxDIR\_IGNORE}.