svtools/source/misc/filechangedchecker.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include <sal/config.h>
  11
  12 #include <svtools/filechangedchecker.hxx>
  13
  14 FileChangedChecker::FileChangedChecker(const OUString& rFilename, const ::boost::function0<void>& rCallback) :
  15     mIdle(),
  16     mFileName(rFilename),
  17     mLastModTime(),
  18     mpCallback(rCallback)
  19 {
  20     // Get the curren last file modified Status
  21     getCurrentModTime(mLastModTime);
  22
  23     // associate the callback function for the Idle
  24     mIdle.SetIdleHdl(LINK(this, FileChangedChecker, TimerHandler));
  25
  26     //start the timer
  27     resetTimer();
  28 }
  29
  30 void FileChangedChecker::resetTimer()
  31 {
  32     //Start the Idle if its not active
  33     if(!mIdle.IsActive())
  34         mIdle.Start();
  35
  36     // Set lowest Priority
  37     mIdle.SetPriority(SchedulerPriority::LOWEST);
  38 }
  39
  40 bool FileChangedChecker::getCurrentModTime(TimeValue& o_rValue) const
  41 {
  42     // Need a Directory item to fetch file status
  43     osl::DirectoryItem aItem;
  44     osl::DirectoryItem::get(mFileName, aItem);
  45
  46     // Retrieve the status - we are only interested in last File
  47     // Modified time
  48     osl::FileStatus aStatus( osl_FileStatus_Mask_ModifyTime );
  49     if( osl::FileBase::E_None != aItem.getFileStatus(aStatus) )
  50         return false;
  51
  52     o_rValue = aStatus.getModifyTime();
  53     return true;
  54 }
  55
  56 bool FileChangedChecker::hasFileChanged()
  57 {
  58     // Get the current file Status
  59     TimeValue newTime={0,0};
  60     if( !getCurrentModTime(newTime) )
  61         return true; // well. hard to answer correctly here ...
  62
  63     // Check if the seconds time stamp has any difference
  64     // If so, then our file has changed meanwhile
  65     if( newTime.Seconds != mLastModTime.Seconds ||
  66         newTime.Nanosec != mLastModTime.Nanosec )
  67     {
  68         // Since the file has changed, set the new status as the file status and
  69         // return True
  70         mLastModTime = newTime ;
  71
  72         return true;
  73     }
  74     else
  75         return false;
  76 }
  77
  78 IMPL_LINK_NOARG_TYPED(FileChangedChecker, TimerHandler, Idle *, void)
  79 {
  80     // If the file has changed, then update the graphic in the doc
  81     OSL_TRACE("Timeout Called");
  82     if(hasFileChanged())
  83     {
  84         OSL_TRACE("File modified");
  85         mpCallback();
  86     }
  87
  88     // Reset the Idle in any case
  89     resetTimer();
  90 }
  91
  92 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */