Re: Ruby GTK modify widget colors

Hi,

In <[email protected]>
  "Ruby GTK modify widget colors" on Thu, 10 Jan 2019 23:38:55 +0100,
  ulli bei Unity <[email protected]> wrote:

> I want to modify the widget colors in GTK3. I only found an example
> with GTK2.
> 
> With GTK3 it doesn't work.
> 
> Has someone a solution?

You can use CSS in GTK+ 3:

require "gtk3"

application = Gtk::Application.new
application.signal_connect(:activate) do
  provider = Gtk::CssProvider.new
  provider.load(data: <<-CSS)
button {
  background-image: none;
  background-color: yellow;
}

label {
  font-size: 28px;
  color: magenta;
}

button:hover {
  background-color: cyan;
}

button:hover label {
  color: blue;
}

button:active {
  background-color: green;
}

button:active label {
  color: white;
}
  CSS
  Gtk::StyleContext.add_provider_for_screen(Gdk::Screen.default,
                                            provider,
                                            Gtk::StyleProvider::PRIORITY_APPLICATION)

  window = Gtk::ApplicationWindow.new(application)
  window.set_size_request(300, 200)

  button = Gtk::Button.new(label: "Button")
  button.set_size_request(100, -1)

  fixed = Gtk::Fixed.new
  fixed.put(button, 10, 10)

  window << fixed
  window.show_all
end
application.run

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