Basic Layouts Example | Qt Widgets 5.13.0

Qt 5.13 | Qt Widgets | Basic Layouts Example

Qt 5.13.0 Reference Documentation

# Basic Layouts Example

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, you may use this file under the terms of the BSD license
      ** as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #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, &QDialogButtonBox::accepted, this, &QDialog::accept);
          connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::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, &QAction::triggered, this, &QDialog::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);
      }