dialog.cpp Example File

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#include <QtWidgets>
#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()));
}