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# dialog.cpp Example File
layouts/dynamiclayouts/dialog.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** 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 "dialog.h"

    Dialog::Dialog(QWidget *parent)
        : QDialog(parent)
    {
        createRotableGroupBox();
        createOptionsGroupBox();
        createButtonBox();

        mainLayout = new QGridLayout;
        mainLayout->addWidget(rotableGroupBox, 0, 0);
        mainLayout->addWidget(optionsGroupBox, 1, 0);
        mainLayout->addWidget(buttonBox, 2, 0);
        setLayout(mainLayout);

        mainLayout->setSizeConstraint(QLayout::SetMinimumSize);

        setWindowTitle(tr("Dynamic Layouts"));
    }

    void Dialog::buttonsOrientationChanged(int index)
    {
        mainLayout->setSizeConstraint(QLayout::SetNoConstraint);
        setMinimumSize(0, 0);

        Qt::Orientation orientation = Qt::Orientation(
                buttonsOrientationComboBox->itemData(index).toInt());

        if (orientation == buttonBox->orientation())
            return;

        mainLayout->removeWidget(buttonBox);

        int spacing = mainLayout->spacing();

        QSize oldSizeHint = buttonBox->sizeHint() + QSize(spacing, spacing);
        buttonBox->setOrientation(orientation);
        QSize newSizeHint = buttonBox->sizeHint() + QSize(spacing, spacing);

        if (orientation == Qt::Horizontal) {
            mainLayout->addWidget(buttonBox, 2, 0);
            resize(size() + QSize(-oldSizeHint.width(), newSizeHint.height()));
        } else {
            mainLayout->addWidget(buttonBox, 0, 3, 2, 1);
            resize(size() + QSize(newSizeHint.width(), -oldSizeHint.height()));
        }

        mainLayout->setSizeConstraint(QLayout::SetDefaultConstraint);
    }

    void Dialog::rotateWidgets()
    {
        Q_ASSERT(rotableWidgets.count() % 2 == 0);

        foreach (QWidget *widget, rotableWidgets)
            rotableLayout->removeWidget(widget);

        rotableWidgets.enqueue(rotableWidgets.dequeue());

        const int n = rotableWidgets.count();
        for (int i = 0; i < n / 2; ++i) {
            rotableLayout->addWidget(rotableWidgets[n - i - 1], 0, i);
            rotableLayout->addWidget(rotableWidgets[i], 1, i);
        }
    }

    void Dialog::help()
    {
        QMessageBox::information(this, tr("Dynamic Layouts Help"),
                                   tr("This example shows how to change layouts "
                                      "dynamically."));
    }

    void Dialog::createRotableGroupBox()
    {
        rotableGroupBox = new QGroupBox(tr("Rotable Widgets"));

        rotableWidgets.enqueue(new QSpinBox);
        rotableWidgets.enqueue(new QSlider);
        rotableWidgets.enqueue(new QDial);
        rotableWidgets.enqueue(new QProgressBar);

        int n = rotableWidgets.count();
        for (int i = 0; i < n; ++i) {
            connect(rotableWidgets[i], SIGNAL(valueChanged(int)),
                    rotableWidgets[(i + 1) % n], SLOT(setValue(int)));
        }

        rotableLayout = new QGridLayout;
        rotableGroupBox->setLayout(rotableLayout);

        rotateWidgets();
    }

    void Dialog::createOptionsGroupBox()
    {
        optionsGroupBox = new QGroupBox(tr("Options"));

        buttonsOrientationLabel = new QLabel(tr("Orientation of buttons:"));

        buttonsOrientationComboBox = new QComboBox;
        buttonsOrientationComboBox->addItem(tr("Horizontal"), Qt::Horizontal);
        buttonsOrientationComboBox->addItem(tr("Vertical"), Qt::Vertical);

        connect(buttonsOrientationComboBox, SIGNAL(currentIndexChanged(int)),
                this, SLOT(buttonsOrientationChanged(int)));

        optionsLayout = new QGridLayout;
        optionsLayout->addWidget(buttonsOrientationLabel, 0, 0);
        optionsLayout->addWidget(buttonsOrientationComboBox, 0, 1);
        optionsLayout->setColumnStretch(2, 1);
        optionsGroupBox->setLayout(optionsLayout);
    }

    void Dialog::createButtonBox()
    {
        buttonBox = new QDialogButtonBox;

        closeButton = buttonBox->addButton(QDialogButtonBox::Close);
        helpButton = buttonBox->addButton(QDialogButtonBox::Help);
        rotateWidgetsButton = buttonBox->addButton(tr("Rotate &Widgets"),
                                                   QDialogButtonBox::ActionRole);

        connect(rotateWidgetsButton, SIGNAL(clicked()), this, SLOT(rotateWidgets()));
        connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));
        connect(helpButton, SIGNAL(clicked()), this, SLOT(help()));
    }