docs/latex/wx/dirtrav.tex

   1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   2 %% Name:        dirtrav.tex
   3 %% Purpose:     wxDirTraverser documentation
   4 %% Author:      Vadim Zeitlin
   5 %% Modified by:
   6 %% Created:     14.01.02 (extracted from dir.tex)
   7 %% RCS-ID:      $Id$
   8 %% Copyright:   (c) Vadim Zeitlin
   9 %% License:     wxWindows license
  10 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  11
  12 \section{\class{wxDirTraverser}}\label{wxdirtraverser}
  13
  14 wxDirTraverser is an abstract interface which must be implemented by objects
  15 passed to \helpref{Traverse}{wxdirtraverse} function.
  16
  17 Example of use (this works almost like \helpref{GetAllFiles}{wxdirgetallfiles}):
  18
  19 \begin{verbatim}
  20     class wxDirTraverserSimple : public wxDirTraverser
  21     {
  22     public:
  23         wxDirTraverserSimple(wxArrayString& files) : m_files(files) { }
  24
  25         virtual wxDirTraverseResult OnFile(const wxString& filename)
  26         {
  27             m_files.Add(filename);
  28             return wxDIR_CONTINUE;
  29         }
  30
  31         virtual wxDirTraverseResult OnDir(const wxString& WXUNUSED(dirname))
  32         {
  33             return wxDIR_CONTINUE;
  34         }
  35
  36     private:
  37         wxArrayString& m_files;
  38     };
  39
  40     // get the names of all files in the array
  41     wxArrayString files;
  42     wxDirTraverserSimple traverser(files);
  43
  44     wxDir dir(dirname);
  45     dir.Traverse(traverser);
  46 \end{verbatim}
  47
  48 \wxheading{Derived from}
  49
  50 No base class
  51
  52 \wxheading{Constants}
  53
  54 The elements of {\tt wxDirTraverseResult} are the possible return values of the
  55 callback functions:
  56
  57 {\small
  58 \begin{verbatim}
  59 enum wxDirTraverseResult
  60 {
  61     wxDIR_IGNORE = -1,      // ignore this directory but continue with others
  62     wxDIR_STOP,             // stop traversing
  63     wxDIR_CONTINUE          // continue into this directory
  64 };
  65 \end{verbatim}
  66 }
  67
  68 \wxheading{Include files}
  69
  70 <wx/dir.h>
  71
  72 \latexignore{\rtfignore{\wxheading{Members}}}
  73
  74
  75 \membersection{wxDirTraverser::OnDir}\label{wxdirtraverserondir}
  76
  77 \func{virtual wxDirTraverseResult}{OnDir}{\param{const wxString\& }{dirname}}
  78
  79 This function is called for each directory. It may return {\tt wxSIR\_STOP}
  80 to abort traversing completely, {\tt wxDIR\_IGNORE} to skip this directory but
  81 continue with others or {\tt wxDIR\_CONTINUE} to enumerate all files and
  82 subdirectories in this directory.
  83
  84 This is a pure virtual function and must be implemented in the derived class.
  85
  86
  87 \membersection{wxDirTraverser::OnFile}\label{wxdirtraverseronfile}
  88
  89 \func{virtual wxDirTraverseResult}{OnFile}{\param{const wxString\& }{filename}}
  90
  91 This function is called for each file. It may return {\tt wxDIR\_STOP} to abort
  92 traversing (for example, if the file being searched is found) or
  93 {\tt wxDIR\_CONTINUE} to proceed.
  94
  95 This is a pure virtual function and must be implemented in the derived class.
  96
  97
  98 \membersection{wxDirTraverser::OnOpenError}\label{wxopenerrortraverseronopenerror}
  99
 100 \func{virtual wxDirTraverseResult}{OnOpenError}{\param{const wxString\& }{openerrorname}}
 101
 102 This function is called for each directory which we failed to open for
 103 enumerating. It may return {\tt wxSIR\_STOP} to abort traversing completely,
 104 {\tt wxDIR\_IGNORE} to skip this directory but continue with others or
 105 {\tt wxDIR\_CONTINUE} to retry opening this directory once again.
 106
 107 The base class version always returns {\tt wxDIR\_IGNORE}.
 108
 109