Macro gtk_macros::add_style_class

macro_rules! add_style_class {
    ($widget:expr, @$name:ident) => { ... };
    ($widget:expr, $names:expr) => { ... };
}

Add a style class or list of style classes to a widget

• Before:

  Example 1:

  let button = gtk::Button::new();
  let ctx = button.style_context();
  ctx.add_class("foo");

  Example 2:

  let button = gtk::Button::new();
  let ctx = button.style_context();
  ctx.add_class("foo");
  ctx.add_class("bar");

• After:

  Example 1:

  let button = gtk::Button::new();
  add_style_class!(button, @foo);

  Example 2:

  let button = gtk::Button::new();
  add_style_class!(button, &["foo", "bar"]);