qt5base-lts/tests/manual/qlayout/gridwidget.cpp

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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the test suite of the Qt Toolkit.
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#include "gridwidget.h"
#include <QGridLayout>
#include <QPushButton>
#include <QComboBox>
#include <QDateTimeEdit>
#include <QLineEdit>
#include <QSpinBox>
#include <QLabel>
#include <QCheckBox>

GridWidget::GridWidget(QWidget *parent) :
    QWidget(parent)
{
    QGridLayout *hb = new QGridLayout(this);
    hb->setObjectName("GridWidget");
    QComboBox *combo = new QComboBox();
    combo->addItem("123");
    QComboBox *combo2 = new QComboBox();
    combo2->setEditable(true);
    combo2->addItem("123");

    hb->addWidget(new QLabel("123"), 0, 0);
    hb->addWidget(new QLabel("123"), 0, 1);
    hb->addWidget(new QLineEdit("123"), 1, 0);
    hb->addWidget(new QLineEdit("123"), 1, 1);
    hb->addWidget(new QCheckBox("123"), 0, 2);
    hb->addWidget(new QCheckBox("123"), 1, 2);
    hb->addWidget(combo, 0, 3);
    hb->addWidget(combo2, 1, 3);
    hb->addWidget(new QDateTimeEdit(), 0, 4);
    hb->addWidget(new QPushButton("123"), 1, 4);
    hb->addWidget(new QSpinBox(), 0, 5);
    hb->addWidget(new QSpinBox(), 1, 5);

    qDebug("There should be four warnings, but no crash or freeze:");
    hb->addWidget(this, 6, 6); ///< This command should print a warning, but should not add "this"
    hb->addWidget(nullptr, 6, 7); ///< This command should print a warning, but should not add "NULL"
    hb->addLayout(hb, 7, 6); ///< This command should print a warning, but should not add "hb"
    hb->addLayout(nullptr, 7, 7); ///< This command should print a warning, but should not add "NULL"
    qDebug("Neither crashed nor frozen");
}