--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hbcore/gui/hbwidgetsequentialshow.cpp	Mon Apr 19 14:02:13 2010 +0300
@@ -0,0 +1,121 @@
+/****************************************************************************
+**
+** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (developer.feedback@nokia.com)
+**
+** This file is part of the HbCore module of the UI Extensions for Mobile.
+**
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this file.
+** Please review the following information to ensure the GNU Lesser General
+** Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at developer.feedback@nokia.com.
+**
+****************************************************************************/
+
+#include "hbwidgetsequentialshow_p.h"
+#include <hbwidget.h>
+
+HbWidgetSequentialShow::HbWidgetSequentialShow(ExternalSynchorization *externalSynchorization,
+    void *funcArg)
+{
+    mWidgetShown = 0;
+    mExternalSynchorization = externalSynchorization; // no ownership transfer
+    mExternalSynchorizationArg = funcArg;
+}
+
+HbWidgetSequentialShow::~HbWidgetSequentialShow()
+{
+}
+
+// Add widget into a show queue
+void HbWidgetSequentialShow::add(HbWidget *widget)
+{
+    // Allow only single instance of a same widget in the queue
+    if (mQueue.contains(widget)) {
+        return;
+    }
+    mQueue.append(widget);
+    connect(widget, SIGNAL(visibleChanged()), SLOT(widgetVisibleChanged()));
+}
+
+// Remove widget from a show queue
+void HbWidgetSequentialShow::remove(HbWidget *widget)
+{
+    if (mWidgetShown == widget) {
+        mWidgetShown = 0;
+    }
+    mQueue.removeOne(widget);
+    widget->disconnect(this);
+    showNext();
+}
+
+// Set currently showing widget
+void HbWidgetSequentialShow::setShowing(HbWidget *widget)
+{
+    Q_ASSERT(mWidgetShown == 0);
+    mWidgetShown = widget;
+}
+
+// Return a widget that is to be shown
+HbWidget *HbWidgetSequentialShow::toShowNow()
+{
+    HbWidget *toShow = 0;
+    if (mWidgetShown == 0 && !mQueue.empty() && externalAllows()){
+        toShow = static_cast<HbWidget*>(mQueue.first());
+    }
+    return toShow;
+}
+
+// Show next widget if appropriate
+void HbWidgetSequentialShow::showNext()
+{
+    HbWidget *toShow = toShowNow();
+    if (toShow) {
+        toShow->show();
+    }
+}
+
+// Return true if external synchronization allows showing of widget
+bool HbWidgetSequentialShow::externalAllows()
+{
+    bool allows = true;
+    if (mExternalSynchorization) {
+        allows = mExternalSynchorization(mExternalSynchorizationArg);
+    }
+    return allows;
+}
+
+// Widget visibility has changed
+void HbWidgetSequentialShow::widgetVisibleChanged()
+{
+    // Added to the queue.
+    HbWidget *widget = static_cast<HbWidget*>(sender());
+    if (!widget->isVisible()) {
+        // Hidden widget is removed from the queue
+        remove(widget);
+    }
+    else {
+        // Widget is visible, it should be the widget currently shown. If not, remove it from
+        // the queue as sequence has been broken.
+        if (mWidgetShown != widget) {
+            remove(widget);
+        }
+    }
+}
+
+// External synchronization status has changed
+void HbWidgetSequentialShow::externalStatusChanged()
+{
+    showNext();
+}