DarkMode.h

#pragma once
#include <QApplication>
#include <QCheckBox>
#include <QFrame>
#include <QLabel>
#include <QListWidget>
#include <QMainWindow>
#include <QPushButton>
#include <QRadioButton>

namespace Examples {
  class Application : public QApplication {
  public:
    Application(int &argc, char **argv) : QApplication(argc, argv) {
      enableDarkMode();
    }

  private:
    void enableDarkMode() {
    #ifndef Q_OS_MACOS
      qApp->setStyle("Fusion");
      auto darkPalette = QPalette();
      auto darkColor = QColor(38, 38, 38);
      auto disabledColor = QColor(127,127,127);
      darkPalette.setColor(QPalette::Window, darkColor);
      darkPalette.setColor(QPalette::WindowText, Qt::white);
      darkPalette.setColor(QPalette::Base, QColor(18,18,18));
      darkPalette.setColor(QPalette::AlternateBase, darkColor);
      darkPalette.setColor(QPalette::ToolTipBase, Qt::white);
      darkPalette.setColor(QPalette::ToolTipText, Qt::white);
      darkPalette.setColor(QPalette::Text, Qt::white);
      darkPalette.setColor(QPalette::Disabled, QPalette::Text, disabledColor);
      darkPalette.setColor(QPalette::Button, darkColor);
      darkPalette.setColor(QPalette::ButtonText, Qt::white);
      darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, disabledColor);
      darkPalette.setColor(QPalette::BrightText, Qt::red);
      darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));
      darkPalette.setColor(QPalette::Highlight, QColor(42, 130, 218));
      darkPalette.setColor(QPalette::HighlightedText, Qt::black);
      darkPalette.setColor(QPalette::Disabled, QPalette::HighlightedText, disabledColor);

      qApp->setPalette(darkPalette);
      qApp->setStyleSheet("QToolTip { color: #ffffff; background-color: #2a82da; border: 1px solid white; }");
    #endif
    }
  };

  class Window1 : public QMainWindow {
    Q_OBJECT
  public:
    Window1() {
      label.move(10, 14);
      label.setText("Dark mode");

      pushButton.move(110, 10);
      pushButton.setText("Click me");

      listWidget.move(10, 50);
      listWidget.resize(120, 100);
      listWidget.addItems({"Item 1", "Item 2", "Item 3", "Item 4", "Item 5", "Item 6", "Item 7", "Item 8", "Item 9", "Item 10"});
      listWidget.setCurrentRow(0);

      radioButton1.move(10, 170);
      radioButton1.setText("Radio 1");
      radioButton1.setChecked(true);

      radioButton2.move(110, 170);
      radioButton2.setText("Radio 2");

      checkBox1.move(10, 200);
      checkBox1.setText("Check 1");
      checkBox1.setChecked(true);

      checkBox2.move(110, 200);
      checkBox2.setText("Check 2");

      setCentralWidget(&frame);
      resize(300, 300);
    }

  private:
    QFrame frame;
    QLabel label {&frame};
    QPushButton pushButton {&frame};
    QListWidget listWidget {&frame};
    QRadioButton radioButton1 {&frame};
    QRadioButton radioButton2 {&frame};
    QCheckBox checkBox1 {&frame};
    QCheckBox checkBox2 {&frame};
  };
}