change color of button on click in cpp qt code example

Example 1: change button color java swing

botton.SetBackground(Color.red);

Example 2: cgange background from button click java fx

BackgroundImage backgroundImage = new BackgroundImage( new Image( getClass().getResource("/testing/background.jpg").toExternalForm()), BackgroundRepeat.NO_REPEAT, BackgroundRepeat.NO_REPEAT, BackgroundPosition.DEFAULT, BackgroundSize.DEFAULT);
        Background background = new Background(backgroundImage);

        Button button = new Button( "Click me!");
        button.setBackground(background);