source: trunk/examples/layouts/dynamiclayouts/dialog.cpp@ 628

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#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()));
}