added a preImage of the selection in order to avoid unnecessary events being triggered

[wxWidgets.git] / src / unix / dir.cpp

diff --git a/src/unix/dir.cpp b/src/unix/dir.cpp
index 13b8d2a68a05becc2630de91a4735e7783d0913e..95f2e78f191d1094ecf4ed0db2d829ac8a30004f 100644 (file)
--- a/src/unix/dir.cpp
+++ b/src/unix/dir.cpp
@@ -37,6 +37,8 @@
 #include "wx/filefn.h"          // for wxMatchWild
 
 #include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
 
 #include <dirent.h>
 
@@ -117,9 +119,14 @@ wxDirData::~wxDirData()
 
 bool wxDirData::Read(wxString *filename)
 {
-    dirent *de = (dirent *)NULL;    // just to silent compiler warnings
+    dirent *de = (dirent *)NULL;    // just to silence compiler warnings
     bool matches = FALSE;
 
+    // speed up string concatenation in the loop a bit
+    wxString path = m_dirname;
+    path += _T('/');
+    path.reserve(path.length() + 255);
+
     while ( !matches )
     {
         de = readdir(m_dir);
@@ -133,24 +140,25 @@ bool wxDirData::Read(wxString *filename)
         {
             if ( !(m_flags & wxDIR_DOTDOT) )
                 continue;
+
+            // we found a valid match
+            break;
         }
 
         // check the type now
-        if ( !(m_flags & wxDIR_FILES) &&
-             !wxDir::Exists(m_dirname + _T('/') + de->d_name) )
+        if ( !(m_flags & wxDIR_FILES) && !wxDir::Exists(path + de->d_name) )
         {
             // it's a file, but we don't want them
             continue;
         }
-        else if ( !(m_flags & wxDIR_DIRS) &&
-                  wxDir::Exists(m_dirname + _T('/') + de->d_name) )
+        else if ( !(m_flags & wxDIR_DIRS) && wxDir::Exists(path + de->d_name) )
         {
             // it's a dir, and we don't want it
             continue;
         }
 
         // finally, check the name
-        if ( !m_filespec )
+        if ( m_filespec.empty() )
         {
             matches = m_flags & wxDIR_HIDDEN ? TRUE : de->d_name[0] != '.';
         }
@@ -277,3 +285,49 @@ bool wxDir::GetNext(wxString *filename) const
 
     return M_DIR->Read(filename);
 }
+
+bool wxDir::HasSubDirs(const wxString& spec)
+{
+    wxCHECK_MSG( IsOpened(), FALSE, _T("must wxDir::Open() first") );
+
+    if ( spec.empty() )
+    {
+        // faster check for presence of any subdirectory: normally each subdir
+        // has a hard link to the parent directory and so, knowing that there
+        // are at least "." and "..", we have a subdirectory if and only if
+        // links number is > 2 - this is just a guess but it works fairly well
+        // in practice
+        //
+        // note that we may guess wrongly in one direction only: i.e. we may
+        // return true when there are no subdirectories but this is ok as the
+        // caller will learn it soon enough when it calls GetFirst(wxDIR)
+        // anyhow
+        wxStructStat stBuf;
+        if ( wxStat(M_DIR->GetName(), &stBuf) == 0 )
+        {
+            switch ( stBuf.st_nlink )
+            {
+                case 2:
+                    // just "." and ".."
+                    return FALSE;
+
+                case 0:
+                case 1:
+                    // weird filesystem, don't try to guess for it, use dumb
+                    // method below
+                    break;
+
+                default:
+                    // assume we have subdirs - may turn out to be wrong if we
+                    // have other hard links to this directory but it's not
+                    // that bad as explained above
+                    return TRUE;
+            }
+        }
+    }
+
+    // just try to find first directory
+    wxString s;
+    return GetFirst(&s, spec, wxDIR_DIRS | wxDIR_HIDDEN);
+}
+