Qt 5.11 | Qt Widgets | Basic Layouts Example | dialog.cpp Example File

Qt 5.11.3 Reference Documentation

# dialog.cpp Example File

layouts/basiclayouts/dialog.cpp

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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);
      }