embeddeddialog.cpp Example File

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 #include "embeddeddialog.h"
 #include "ui_embeddeddialog.h"

 #include <QtWidgets>

 EmbeddedDialog::EmbeddedDialog(QWidget *parent)
     : QDialog(parent)
 {
     ui = new Ui_embeddedDialog;
     ui->setupUi(this);
     ui->layoutDirection->setCurrentIndex(layoutDirection() != Qt::LeftToRight);

     foreach (QString styleName, QStyleFactory::keys()) {
         ui->style->addItem(styleName);
         if (style()->objectName().toLower() == styleName.toLower())
             ui->style->setCurrentIndex(ui->style->count() - 1);
     }

     connect(ui->layoutDirection, SIGNAL(activated(int)),
             this, SLOT(layoutDirectionChanged(int)));
     connect(ui->spacing, SIGNAL(valueChanged(int)),
             this, SLOT(spacingChanged(int)));
     connect(ui->fontComboBox, SIGNAL(currentFontChanged(QFont)),
             this, SLOT(fontChanged(QFont)));
     connect(ui->style, SIGNAL(activated(QString)),
             this, SLOT(styleChanged(QString)));
 }

 EmbeddedDialog::~EmbeddedDialog()
 {
     delete ui;
 }

 void EmbeddedDialog::layoutDirectionChanged(int index)
 {
     setLayoutDirection(index == 0 ? Qt::LeftToRight : Qt::RightToLeft);
 }

 void EmbeddedDialog::spacingChanged(int spacing)
 {
     layout()->setSpacing(spacing);
     adjustSize();
 }

 void EmbeddedDialog::fontChanged(const QFont &font)
 {
     setFont(font);
 }

 static void setStyleHelper(QWidget *widget, QStyle *style)
 {
     widget->setStyle(style);
     widget->setPalette(style->standardPalette());
     foreach (QObject *child, widget->children()) {
         if (QWidget *childWidget = qobject_cast<QWidget *>(child))
             setStyleHelper(childWidget, style);
     }
 }

 void EmbeddedDialog::styleChanged(const QString &styleName)
 {
     QStyle *style = QStyleFactory::create(styleName);
     if (style)
         setStyleHelper(this, style);
 }