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# simplewizard.cpp Example File
dialogs/simplewizard/simplewizard.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
        ** this file.  Please review the following information to ensure GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
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        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #include <QtGui>

        #include "simplewizard.h"

        SimpleWizard::SimpleWizard(QWidget *parent)
            : QDialog(parent)
        {
            cancelButton = new QPushButton(tr("Cancel"));
            backButton = new QPushButton(tr("< &Back"));
            nextButton = new QPushButton(tr("Next >"));
            finishButton = new QPushButton(tr("&Finish"));

            connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));
            connect(backButton, SIGNAL(clicked()), this, SLOT(backButtonClicked()));
            connect(nextButton, SIGNAL(clicked()), this, SLOT(nextButtonClicked()));
            connect(finishButton, SIGNAL(clicked()), this, SLOT(accept()));

            buttonLayout = new QHBoxLayout;
            buttonLayout->addStretch(1);
            buttonLayout->addWidget(cancelButton);
            buttonLayout->addWidget(backButton);
            buttonLayout->addWidget(nextButton);
            buttonLayout->addWidget(finishButton);

            mainLayout = new QVBoxLayout;
            mainLayout->addLayout(buttonLayout);
            setLayout(mainLayout);
        }

        void SimpleWizard::setButtonEnabled(bool enable)
        {
            if (history.size() == numPages)
                finishButton->setEnabled(enable);
            else
                nextButton->setEnabled(enable);
        }

        void SimpleWizard::setNumPages(int n)
        {
            numPages = n;
            history.append(createPage(0));
            switchPage(0);
        }

        void SimpleWizard::backButtonClicked()
        {
            nextButton->setEnabled(true);
            finishButton->setEnabled(true);

            QWidget *oldPage = history.takeLast();
            switchPage(oldPage);
            delete oldPage;
        }

        void SimpleWizard::nextButtonClicked()
        {
            nextButton->setEnabled(true);
            finishButton->setEnabled(history.size() == numPages - 1);

            QWidget *oldPage = history.last();
            history.append(createPage(history.size()));
            switchPage(oldPage);
        }

        void SimpleWizard::switchPage(QWidget *oldPage)
        {
            if (oldPage) {
                oldPage->hide();
                mainLayout->removeWidget(oldPage);
            }

            QWidget *newPage = history.last();
            mainLayout->insertWidget(0, newPage);
            newPage->show();
            newPage->setFocus();

            backButton->setEnabled(history.size() != 1);
            if (history.size() == numPages) {
                nextButton->setEnabled(false);
                finishButton->setDefault(true);
            } else {
                nextButton->setDefault(true);
                finishButton->setEnabled(false);
            }

            setWindowTitle(tr("Simple Wizard - Step %1 of %2")
                           .arg(history.size())
                           .arg(numPages));
        }