1 files changed, 115 insertions, 0 deletions
diff --git a/svtools/source/misc/filechangedchecker.cxx b/svtools/source/misc/filechangedchecker.cxx
new file mode 100644
index 0000000000..7ffc5cae83
--- /dev/null
+++ b/svtools/source/misc/filechangedchecker.cxx
@@ -0,0 +1,115 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+#include <osl/file.hxx>
+
+#include <svtools/filechangedchecker.hxx>
+#include <utility>
+#include <vcl/timer.hxx>
+
+FileChangedChecker::FileChangedChecker(OUString aFilename,
+        ::std::function<void ()> aCallback)
+    : mTimer("SVTools FileChangedChecker Timer")
+    , mFileName(std::move(aFilename))
+    , mLastModTime()
+    , mpCallback(std::move(aCallback))
+{
+    // Get the current last file modified Status
+    getCurrentModTime(mLastModTime);
+
+    // associate the callback function for the Timer
+    mTimer.SetInvokeHandler(LINK(this, FileChangedChecker, TimerHandler));
+
+    // set timer interval
+    mTimer.SetTimeout(100);
+
+    // start the timer
+    resetTimer();
+}
+
+FileChangedChecker::FileChangedChecker(OUString aFilename)
+    : mTimer("")
+    , mFileName(std::move(aFilename))
+    , mLastModTime()
+    , mpCallback(nullptr)
+{
+    // Get the current last file modified Status
+    getCurrentModTime(mLastModTime);
+}
+
+void FileChangedChecker::resetTimer()
+{
+    if (mpCallback == nullptr)
+        return;
+
+    // Start the Idle if it's not active
+    if (!mTimer.IsActive())
+        mTimer.Start();
+
+    // Set lowest Priority
+    mTimer.SetPriority(TaskPriority::LOWEST);
+}
+
+bool FileChangedChecker::getCurrentModTime(TimeValue& o_rValue) const
+{
+    // Need a Directory item to fetch file status
+    osl::DirectoryItem aItem;
+    if (osl::FileBase::E_None != osl::DirectoryItem::get(mFileName, aItem))
+        return false;
+
+    // Retrieve the status - we are only interested in last File
+    // Modified time
+    osl::FileStatus aStatus( osl_FileStatus_Mask_ModifyTime );
+    if (osl::FileBase::E_None != aItem.getFileStatus(aStatus))
+        return false;
+
+    o_rValue = aStatus.getModifyTime();
+    return true;
+}
+
+bool FileChangedChecker::hasFileChanged(bool bUpdate)
+{
+    // Get the current file Status
+    TimeValue newTime={0,0};
+    if( !getCurrentModTime(newTime) )
+        return true; // well. hard to answer correctly here ...
+
+    // Check if the seconds time stamp has any difference
+    // If so, then our file has changed meanwhile
+    if( newTime.Seconds != mLastModTime.Seconds ||
+        newTime.Nanosec != mLastModTime.Nanosec )
+    {
+        // Since the file has changed, set the new status as the file status and
+        // return True
+        if(bUpdate)
+            mLastModTime = newTime ;
+
+        return true;
+    }
+    else
+        return false;
+}
+
+IMPL_LINK_NOARG(FileChangedChecker, TimerHandler, Timer *, void)
+{
+    // If the file has changed, then update the graphic in the doc
+    SAL_INFO("svtools", "Timeout Called");
+    if(hasFileChanged())
+    {
+        SAL_INFO("svtools", "File modified");
+        mpCallback();
+    }
+
+    // Reset the Timer in any case
+    resetTimer();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */