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()));
  }