valgrind: code cosmetics

Change-Id: I695c7d40aeb0b0b1e6f8cc0856e5fa5d9d1ce2d1
Reviewed-on: http://codereview.qt.nokia.com/1600
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/valgrind/callgrind/callgrindstackbrowser.cpp

@@ -0,0 +1,84 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** 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.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at info@qt.nokia.com.
+**
+**************************************************************************/
+
+#include "callgrindstackbrowser.h"
+
+namespace Valgrind {
+namespace Callgrind {
+
+StackBrowser::StackBrowser(QObject *parent)
+    : QObject(parent)
+{
+}
+
+void StackBrowser::clear()
+{
+    m_stack.clear();
+    m_redoStack.clear();
+    emit currentChanged();
+}
+
+void StackBrowser::select(const Function *item)
+{
+    if (!m_stack.isEmpty() && m_stack.top() == item)
+        return;
+
+    m_stack.push(item);
+    m_redoStack.clear();
+    emit currentChanged();
+}
+
+const Function *StackBrowser::current() const
+{
+    return m_stack.isEmpty() ? 0 : m_stack.top();
+}
+
+void StackBrowser::goBack()
+{
+    if (m_stack.isEmpty())
+        return;
+
+    m_redoStack.push(m_stack.pop());
+    emit currentChanged();
+}
+
+void StackBrowser::goNext()
+{
+    if (m_redoStack.isEmpty())
+        return;
+
+    m_stack.push(m_redoStack.pop());
+    emit currentChanged();
+}
+
+} // namespace Callgrind
+} // namespace Valgrind