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#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()));

}