text: /****************************************************************************
  **
  ** Copyright (C) 2015 The Qt Company Ltd.
  ** Contact: http://www.qt.io/licensing/
  **
  ** This file is part of the test suite of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL21$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
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  ** information use the contact form at http://www.qt.io/contact-us.
  **
  ** GNU Lesser General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU Lesser
  ** General Public License version 2.1 or version 3 as published by the Free
  ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
  ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
  ** following information to ensure the GNU Lesser General Public License
  ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
  ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  **
  ** As a special exception, The Qt Company gives you certain additional
  ** rights. These rights are described in The Qt Company LGPL Exception
  ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  #include "mainwindow.h"
  #include "hbwidget.h"
  #include "vbwidget.h"
  #include "gridwidget.h"
  #include <QGridLayout>
  #include <QComboBox>
  
  MainWindow::MainWindow(QWidget *parent)
      : QMainWindow(parent)
  {
      QWidget *widget = new QWidget(this);
      setCentralWidget(widget);
      m_mainLayout = new QGridLayout(widget);
  
      QComboBox *combo = new QComboBox();
      combo->addItem("HBox Layout");
      combo->addItem("VBox Layout");
      combo->addItem("Grid Layout");
      connect(combo, SIGNAL(currentIndexChanged(int)), this, SLOT(layoutIndexChanged(int)));
      HbWidget *hbWidget = new HbWidget(this);
  
      m_mainLayout->addWidget(combo);
      m_mainLayout->addWidget(hbWidget);
  }
  
  MainWindow::~MainWindow()
  {
  
  }
  
  void MainWindow::layoutIndexChanged(int index)
  {
      delete m_mainLayout->takeAt(1)->widget();
  
      switch (index) {
      case 0: {
          HbWidget *hbWidget = new HbWidget(this);
          m_mainLayout->addWidget(hbWidget);
          break;
          }
      case 1: {
          VbWidget *vbWidget = new VbWidget(this);
          m_mainLayout->addWidget(vbWidget);
          break;
          }
      default: {
          GridWidget *gridW = new GridWidget(this);
          m_mainLayout->addWidget(gridW);
          break;
          }
      }
  }
  