- Qt 5.5
- Qt Widgets
- Basic Layouts Example
- dialog.cpp Example File
- Qt 5.5.1 Reference Documentation

# dialog.cpp Example File

layouts/basiclayouts/dialog.cpp

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    ** This file is part of the examples of the Qt Toolkit.
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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);
    }