src/msw/dirdlg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dirdlg.cpp
   3 // Purpose:     wxDirDialog
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "dirdlg.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_DIRDLG
  32
  33 #if defined(__WIN95__) && !defined(__GNUWIN32_OLD__) && wxUSE_OLE
  34
  35 #ifndef WX_PRECOMP
  36     #include "wx/utils.h"
  37     #include "wx/dialog.h"
  38     #include "wx/dirdlg.h"
  39     #include "wx/log.h"
  40 #endif
  41
  42 #include "wx/msw/private.h"
  43
  44 #include <shlobj.h> // Win95 shell
  45
  46 // ----------------------------------------------------------------------------
  47 // constants
  48 // ----------------------------------------------------------------------------
  49
  50 #ifndef MAX_PATH
  51     #define MAX_PATH 4096      // be generous
  52 #endif
  53
  54 // ----------------------------------------------------------------------------
  55 // wxWindows macros
  56 // ----------------------------------------------------------------------------
  57
  58 IMPLEMENT_CLASS(wxDirDialog, wxDialog)
  59
  60 // ----------------------------------------------------------------------------
  61 // private functions prototypes
  62 // ----------------------------------------------------------------------------
  63
  64 // free the parameter
  65 static void ItemListFree(LPITEMIDLIST pidl);
  66
  67 // the callback proc for the dir dlg
  68 static int CALLBACK BrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lp,
  69                                        LPARAM pData);
  70
  71
  72 // ============================================================================
  73 // implementation
  74 // ============================================================================
  75
  76 // ----------------------------------------------------------------------------
  77 // wxDirDialog
  78 // ----------------------------------------------------------------------------
  79
  80 wxDirDialog::wxDirDialog(wxWindow *parent,
  81                          const wxString& message,
  82                          const wxString& defaultPath,
  83                          long WXUNUSED(style),
  84                          const wxPoint& WXUNUSED(pos))
  85 {
  86     m_message = message;
  87     m_parent = parent;
  88
  89     SetPath(defaultPath);
  90 }
  91
  92 void wxDirDialog::SetPath(const wxString& path)
  93 {
  94     m_path = path;
  95
  96     // SHBrowseForFolder doesn't like '/'s nor the trailing backslashes
  97     m_path.Replace(_T("/"), _T("\\"));
  98     if ( !m_path.empty() )
  99     {
 100         while ( *(m_path.end() - 1) == _T('\\') )
 101         {
 102             size_t len = m_path.length();
 103             if ( len == 1 )
 104             {
 105                 // leave '/' alone
 106                 break;
 107             }
 108
 109             m_path.erase(len - 1);
 110         }
 111     }
 112 }
 113
 114 int wxDirDialog::ShowModal()
 115 {
 116     wxWindow *parent = GetParent();
 117
 118     BROWSEINFO bi;
 119     bi.hwndOwner      = parent ? GetHwndOf(parent) : NULL;
 120     bi.pidlRoot       = NULL;
 121     bi.pszDisplayName = NULL;
 122     bi.lpszTitle      = m_message.c_str();
 123     bi.ulFlags        = BIF_RETURNONLYFSDIRS | BIF_STATUSTEXT;
 124     bi.lpfn           = BrowseCallbackProc;
 125     bi.lParam         = (LPARAM)m_path.c_str();    // param for the callback
 126
 127     LPITEMIDLIST pidl = SHBrowseForFolder(&bi);
 128
 129     if ( bi.pidlRoot )
 130     {
 131         ItemListFree((LPITEMIDLIST)bi.pidlRoot);
 132     }
 133
 134     if ( !pidl )
 135     {
 136         // Cancel button pressed
 137         return wxID_CANCEL;
 138     }
 139
 140     BOOL ok = SHGetPathFromIDList(pidl, m_path.GetWriteBuf(MAX_PATH));
 141     m_path.UngetWriteBuf();
 142
 143     ItemListFree(pidl);
 144
 145     if ( !ok )
 146     {
 147         wxLogLastError(wxT("SHGetPathFromIDList"));
 148
 149         return wxID_CANCEL;
 150     }
 151
 152     return wxID_OK;
 153 }
 154
 155 // ----------------------------------------------------------------------------
 156 // private functions
 157 // ----------------------------------------------------------------------------
 158
 159 static int CALLBACK
 160 BrowseCallbackProc(HWND hwnd, UINT uMsg, LPARAM lp, LPARAM pData)
 161 {
 162     switch(uMsg)
 163     {
 164         case BFFM_INITIALIZED:
 165             // sent immediately after initialisation and so we may set the
 166             // initial selection here
 167             //
 168             // wParam = TRUE => lParam is a string and not a PIDL
 169             SendMessage(hwnd, BFFM_SETSELECTION, TRUE, pData);
 170             break;
 171
 172         case BFFM_SELCHANGED:
 173             {
 174                 // Set the status window to the currently selected path.
 175                 TCHAR szDir[MAX_PATH];
 176                 if ( SHGetPathFromIDList((LPITEMIDLIST)lp, szDir) )
 177                 {
 178                     wxString strDir(szDir);
 179                     int maxChars = 40; // Have to truncate string else it displays incorrectly
 180                     if (strDir.Len() > (size_t) (maxChars - 3))
 181                     {
 182                         strDir = strDir.Right(maxChars - 3);
 183                         strDir = wxString(wxT("...")) + strDir;
 184                     }
 185                     SendMessage(hwnd, BFFM_SETSTATUSTEXT, 0, (LPARAM) (const wxChar*) strDir);
 186                 }
 187             }
 188             break;
 189
 190         //case BFFM_VALIDATEFAILED: -- might be used to provide custom message
 191         //                             if the user types in invalid dir name
 192     }
 193
 194     return 0;
 195 }
 196
 197
 198 static void ItemListFree(LPITEMIDLIST pidl)
 199 {
 200     if ( pidl )
 201     {
 202         LPMALLOC pMalloc;
 203         SHGetMalloc(&pMalloc);
 204         if ( pMalloc )
 205         {
 206             pMalloc->Free(pidl);
 207             pMalloc->Release();
 208         }
 209         else
 210         {
 211             wxLogLastError(wxT("SHGetMalloc"));
 212         }
 213     }
 214 }
 215
 216 #else
 217     #include "../generic/dirdlgg.cpp"
 218 #endif // compiler/platform on which the code here compiles
 219
 220 #endif // wxUSE_DIRDLG