stylewidget.cpp Example File

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 #include <QApplication>
 #include <QString>
 #include <QFile>

 #include "stylewidget.h"

 StyleWidget::StyleWidget(QWidget *parent)
  : QFrame(parent)
 {
         m_ui.setupUi(this);
 }

 void StyleWidget::on_close_clicked()
 {
     close();
 }

 void StyleWidget::on_blueStyle_clicked()
 {
     QFile styleSheet(":/files/blue.qss");

     if (!styleSheet.open(QIODevice::ReadOnly)) {
         qWarning("Unable to open :/files/blue.qss");
         return;
     }

     qApp->setStyleSheet(styleSheet.readAll());
 }

 void StyleWidget::on_khakiStyle_clicked()
 {
     QFile styleSheet(":/files/khaki.qss");

     if (!styleSheet.open(QIODevice::ReadOnly)) {
         qWarning("Unable to open :/files/khaki.qss");
         return;
     }

     qApp->setStyleSheet(styleSheet.readAll());
 }

 void StyleWidget::on_noStyle_clicked()
 {
     QFile styleSheet(":/files/nostyle.qss");

     if (!styleSheet.open(QIODevice::ReadOnly)) {
         qWarning("Unable to open :/files/nostyle.qss");
         return;
     }

     qApp->setStyleSheet(styleSheet.readAll());
 }

 void StyleWidget::on_transparentStyle_clicked()
 {
     QFile styleSheet(":/files/transparent.qss");

     if (!styleSheet.open(QIODevice::ReadOnly)) {
         qWarning("Unable to open :/files/transparent.qss");
         return;
     }

     qApp->setStyleSheet(styleSheet.readAll());
 }