dialog.cpp Example File

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  #include <QtWidgets>

  #include "dialog.h"

  Dialog::Dialog()
  {
      createMenu();
      createHorizontalGroupBox();
      createGridGroupBox();
      createFormGroupBox();

      bigEditor = new QTextEdit;
      bigEditor->setPlainText(tr("This widget takes up all the remaining space "
                                 "in the top-level layout."));

      buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok
                                       | QDialogButtonBox::Cancel);

      connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
      connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));

      QVBoxLayout *mainLayout = new QVBoxLayout;
      mainLayout->setMenuBar(menuBar);
      mainLayout->addWidget(horizontalGroupBox);
      mainLayout->addWidget(gridGroupBox);
      mainLayout->addWidget(formGroupBox);
      mainLayout->addWidget(bigEditor);
      mainLayout->addWidget(buttonBox);
      setLayout(mainLayout);

      setWindowTitle(tr("Basic Layouts"));
  }

  void Dialog::createMenu()
  {
      menuBar = new QMenuBar;

      fileMenu = new QMenu(tr("&File"), this);
      exitAction = fileMenu->addAction(tr("E&xit"));
      menuBar->addMenu(fileMenu);

      connect(exitAction, SIGNAL(triggered()), this, SLOT(accept()));
  }

  void Dialog::createHorizontalGroupBox()
  {
      horizontalGroupBox = new QGroupBox(tr("Horizontal layout"));
      QHBoxLayout *layout = new QHBoxLayout;

      for (int i = 0; i < NumButtons; ++i) {
          buttons[i] = new QPushButton(tr("Button %1").arg(i + 1));
          layout->addWidget(buttons[i]);
      }
      horizontalGroupBox->setLayout(layout);
  }

  void Dialog::createGridGroupBox()
  {
      gridGroupBox = new QGroupBox(tr("Grid layout"));
      QGridLayout *layout = new QGridLayout;

      for (int i = 0; i < NumGridRows; ++i) {
          labels[i] = new QLabel(tr("Line %1:").arg(i + 1));
          lineEdits[i] = new QLineEdit;
          layout->addWidget(labels[i], i + 1, 0);
          layout->addWidget(lineEdits[i], i + 1, 1);
      }

      smallEditor = new QTextEdit;
      smallEditor->setPlainText(tr("This widget takes up about two thirds of the "
                                   "grid layout."));
      layout->addWidget(smallEditor, 0, 2, 4, 1);

      layout->setColumnStretch(1, 10);
      layout->setColumnStretch(2, 20);
      gridGroupBox->setLayout(layout);
  }

  void Dialog::createFormGroupBox()
  {
      formGroupBox = new QGroupBox(tr("Form layout"));
      QFormLayout *layout = new QFormLayout;
      layout->addRow(new QLabel(tr("Line 1:")), new QLineEdit);
      layout->addRow(new QLabel(tr("Line 2, long text:")), new QComboBox);
      layout->addRow(new QLabel(tr("Line 3:")), new QSpinBox);
      formGroupBox->setLayout(layout);
  }