first primitive file watcher implemented

src/musrgui/PFileWatcher.cpp

@@ -0,0 +1,117 @@
+/****************************************************************************
+
+  PFileWatcher.cpp
+
+  Author: Andreas Suter
+  e-mail: andreas.suter@psi.ch
+
+  $Id$
+
+*****************************************************************************/
+
+/***************************************************************************
+ *   Copyright (C) 2009 by Andreas Suter                                   *
+ *   andreas.suter@psi.ch                                                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#include <qfileinfo.h>
+#include <qstring.h>
+#include <qdatetime.h>
+#include <qtimer.h>
+
+#include <qmessagebox.h>
+
+#include "PFileWatcher.h"
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * <p>
+ */
+PFileWatcher::PFileWatcher(const QString &fileName, const QDateTime &lastModified) : fFileName(fileName), fLastModified(lastModified)
+{
+  fFileInfo = 0;
+  fFileInfo = new QFileInfo(fFileName);
+  if (!fFileInfo) {
+    fValid = false;
+  }
+}
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * <p>
+ */
+PFileWatcher::~PFileWatcher()
+{
+  if (fFileInfo) {
+    delete fFileInfo;
+    fFileInfo = 0;
+  }
+}
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * <p>
+ */
+bool PFileWatcher::modified()
+{
+  bool result = false;
+
+  fFileInfo->refresh();
+
+  if (fFileInfo->lastModified() > fLastModified)
+    result = true;
+
+  return result;
+}
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * <p>
+ */
+void PFileWatcher::modified(int timeout)
+{
+  fTimerCheck = new QTimer(this);
+
+  connect( fTimerCheck, SIGNAL(timeout()), this, SLOT(checkIfModified()) );
+  QTimer::singleShot(timeout * 1000, this, SLOT(stopFileCheck()));
+
+  fTimerCheck->start(1000);
+}
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * <p>
+ */
+void PFileWatcher::checkIfModified()
+{
+  fFileInfo->refresh();
+
+  if (fFileInfo->lastModified() > fLastModified) {
+    fTimerCheck->stop();
+    emit changed();
+  }
+}
+
+//----------------------------------------------------------------------------------------------------
+/**
+ * <p>
+ */
+void PFileWatcher::stopFileCheck()
+{
+  fTimerCheck->stop();
+}