1 files changed, 92 insertions, 0 deletions
diff --git a/examples/webenginewidgets/demobrowser/autosaver.cpp b/examples/webenginewidgets/demobrowser/autosaver.cpp
new file mode 100644
index 000000000..53e89b448
--- /dev/null
+++ b/examples/webenginewidgets/demobrowser/autosaver.cpp
@@ -0,0 +1,92 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "autosaver.h"
+
+#include <QtCore/QDir>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QMetaObject>
+#include <QtDebug>
+
+#define AUTOSAVE_IN  1000 * 3  // seconds
+#define MAXWAIT      1000 * 15 // seconds
+
+AutoSaver::AutoSaver(QObject *parent) : QObject(parent)
+{
+    Q_ASSERT(parent);
+}
+
+AutoSaver::~AutoSaver()
+{
+    if (m_timer.isActive())
+        qWarning() << "AutoSaver: still active when destroyed, changes not saved.";
+}
+
+void AutoSaver::changeOccurred()
+{
+    if (m_firstChange.isNull())
+        m_firstChange.start();
+
+    if (m_firstChange.elapsed() > MAXWAIT) {
+        saveIfNeccessary();
+    } else {
+        m_timer.start(AUTOSAVE_IN, this);
+    }
+}
+
+void AutoSaver::timerEvent(QTimerEvent *event)
+{
+    if (event->timerId() == m_timer.timerId()) {
+        saveIfNeccessary();
+    } else {
+        QObject::timerEvent(event);
+    }
+}
+
+void AutoSaver::saveIfNeccessary()
+{
+    if (!m_timer.isActive())
+        return;
+    m_timer.stop();
+    m_firstChange = QTime();
+    if (!QMetaObject::invokeMethod(parent(), "save", Qt::DirectConnection)) {
+        qWarning() << "AutoSaver: error invoking slot save() on parent";
+    }
+}