CVS commit by aacid: 

Watch files as kghostview does (use the very same code :-D)
Will be available in KDE 3.4
FEATURE: 94016


  M +51 -1     kpdf_part.cpp   1.93
  M +10 -4     kpdf_part.h   1.42
  M +1 -0      kpdf_part.rc   1.21


--- kdegraphics/kpdf/kpdf/kpdf_part.cpp  #1.92:1.93
@@ -33,4 +33,5 @@
 #include <kapplication.h>
 #include <kdebug.h>
+#include <kdirwatch.h>
 #include <kinstance.h>
 #include <kprinter.h>
@@ -100,4 +101,5 @@ Part::Part(QWidget *parentWidget, const 
 
   setWidget(pdfpartview);
+  m_watchFile = new KToggleAction( i18n( "&Watch File" ), 0, this, SLOT( slotWatchFile() ), actionCollection(), "watch_file" );
 
   m_showScrollBars = new KToggleAction( i18n( "Show &Scrollbars" ), 0,
@@ -186,4 +188,10 @@ Part::Part(QWidget *parentWidget, const 
   m_zoomTo->setCurrentItem( idx );
 
+  m_watcher = new KDirWatch( this );
+  connect( m_watcher, SIGNAL( dirty( const QString& ) ), this, SLOT( slotFileDirty( const QString& ) ) );
+  m_dirtyHandler = new QTimer( this );
+  connect( m_dirtyHandler, SIGNAL( timeout() ),this, SLOT( slotDoFileDirty() ) );
+
+
 
   // set our XML-UI resource file
@@ -304,4 +312,5 @@ void Part::writeSettings()
     general.writeEntry( "ShowTOC", m_showTOC->isChecked() );
     general.writeEntry( "ShowPageList", m_showPageList->isChecked() );
+    general.writeEntry( "WatchFile", m_watchFile->isChecked() );
     general.sync();
 }
@@ -316,4 +325,6 @@ void Part::readSettings()
     m_showPageList->setChecked( general.readBoolEntry( "ShowPageList", true ) );
     showMarkList( m_showPageList->isChecked() );
+    m_watchFile->setChecked( general.readBoolEntry( "WatchFile", true ) );
+    slotWatchFile();
 }
 
@@ -392,7 +403,46 @@ Part::createAboutData()
 }
 
+  void
+Part::slotWatchFile()
+{
+  if( m_watchFile->isChecked() )
+    m_watcher->startScan();
+  else
+  {
+    m_dirtyHandler->stop();
+    m_watcher->stopScan();
+  }
+}
+
+  void
+Part::slotFileDirty( const QString& fileName )
+{
+  // The beauty of this is that each start cancels the previous one.
+  // This means that timeout() is only fired when there have
+  // no changes to the file for the last 750 milisecs.
+  // This is supposed to ensure that we don't update on every other byte
+  // that gets written to the file.
+  if ( fileName == m_file )
+  {
+    m_dirtyHandler->start( 750, true );
+  }
+}
+
+  void
+Part::slotDoFileDirty()
+{
+  int p = m_currentPage;
+  if (openFile())
+  {
+    if (p > m_doc->getNumPages()) p = m_doc->getNumPages();
+    goToPage(p);
+  }
+}
+
+
   bool
 Part::closeURL()
 {
+  if (!m_file.isEmpty()) m_watcher->removeFile(m_file);
   pdfpartview->stopThumbnailGeneration();
   delete m_doc;
@@ -461,6 +511,6 @@ Part::openFile()
     m_outputDev->setPDFDocument(m_doc);
     goToPage(1);
-
   }
+  if (!m_watcher->contains(m_file)) m_watcher->addFile(m_file);
 
   return true;

--- kdegraphics/kpdf/kpdf/kpdf_part.h  #1.41:1.42
@@ -27,4 +27,5 @@ class KAboutData;
 class KAction;
 class KConfig;
+class KDirWatch;
 class KURL;
 class KToggleAction;
@@ -141,4 +142,5 @@ namespace KPDF
       KAction* m_nextPage;
       KAction *m_gotoPage;
+      KToggleAction* m_watchFile;
       KToggleAction* m_showScrollBars;
       KToggleAction* m_showPageList;
@@ -148,5 +150,6 @@ namespace KPDF
       KAction *m_find;
       KAction *m_findNext;
-
+      KDirWatch *m_watcher;
+      QTimer *m_dirtyHandler;
       QString m_findText;
 
@@ -165,4 +168,7 @@ namespace KPDF
                 void pageClicked ( int );
     void fileSaveAs();
+    void slotWatchFile();
+    void slotFileDirty( const QString& );
+    void slotDoFileDirty();
   };
 

--- kdegraphics/kpdf/kpdf/kpdf_part.rc  #1.20:1.21
@@ -28,4 +28,5 @@
   <Menu name="settings"><text>&amp;Settings</text>
     <Action name="show_scrollbars" group="show_merge"/>
+    <Action name="watch_file" group="show_merge"/>
     <Action name="show_toc" group="show_merge"/>
     <Action name="show_page_list" group="show_merge"/>