dialog.cpp Example File

layouts/dynamiclayouts/dialog.cpp
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 #include <QtWidgets>

 #include "dialog.h"

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

     mainLayout = new QGridLayout;
     mainLayout->addWidget(rotatableGroupBox, 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(rotatableWidgets.count() % 2 == 0);

     foreach (QWidget *widget, rotatableWidgets)
         rotatableLayout->removeWidget(widget);

     rotatableWidgets.enqueue(rotatableWidgets.dequeue());

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

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

 void Dialog::createRotatableGroupBox()
 {
     rotatableGroupBox = new QGroupBox(tr("Rotatable Widgets"));

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

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

     rotatableLayout = new QGridLayout;
     rotatableGroupBox->setLayout(rotatableLayout);

     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,
             QOverload<int>::of(&QComboBox::currentIndexChanged),
             this,
             &Dialog::buttonsOrientationChanged);

     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, &QPushButton::clicked, this, &Dialog::rotateWidgets);
     connect(closeButton, &QPushButton::clicked, this, &Dialog::close);
     connect(helpButton, &QPushButton::clicked, this, &Dialog::help);
 }