qt5base-lts/tests/manual/qscreen/propertywatcher.cpp

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#include "propertywatcher.h"
#include <QMetaProperty>
#include <QFormLayout>
#include <QPushButton>
#include "propertyfield.h"

PropertyWatcher::PropertyWatcher(QObject *subject, QString annotation, QWidget *parent)
    : QWidget(parent), m_subject(subject), m_layout(new QFormLayout)
{
    setWindowTitle(QString("Properties of %1 %2 %3")
        .arg(subject->metaObject()->className()).arg(subject->objectName()).arg(annotation));
    setMinimumSize(450, 300);
    const QMetaObject* meta = m_subject->metaObject();

    for (int i = 0; i < meta->propertyCount(); ++i) {
        QMetaProperty prop = meta->property(i);
        if (prop.isReadable()) {
            PropertyField* field = new PropertyField(m_subject, prop);
            m_layout->addRow(prop.name(), field);
        }
    }
    QPushButton *updateButton = new QPushButton("update");
    connect(updateButton, &QPushButton::clicked, this, &PropertyWatcher::updateAllFields);
    m_layout->addRow("", updateButton);
    m_layout->setFieldGrowthPolicy(QFormLayout::ExpandingFieldsGrow);
    setLayout(m_layout);
    connect(subject, &QObject::destroyed, this, &PropertyWatcher::subjectDestroyed);
}

PropertyWatcher::~PropertyWatcher()
{
}

void PropertyWatcher::updateAllFields()
{
    QList<PropertyField *> fields = findChildren<PropertyField*>();
    foreach (PropertyField *field, fields)
        field->propertyChanged();
    emit updatedAllFields(this);
}

void PropertyWatcher::subjectDestroyed()
{
    qDebug("screen destroyed");
}