lighttroupe/luz

#
# ValueAnimationStates provides named hashes of settings => values, such as "open" or "closed", and the abilty to transition between them
#
# a Ruby version of jQuery's switchClass()
#
module ValueAnimationStates
    def animation_states
        @animation_states ||= {}
    end

    def set_state(name, options)
        add_state(name, options)
        @value_animation_state = name
        set(options)
    end

    def add_state(name, options)
        animation_states[name] = options
        self
    end

    def has_state?(name)
        !animation_states[name].nil?
    end

    def in_state?(name)
        @value_animation_state == name
    end

    def animate_to_state(name, duration=0.5, &proc)
        options = animation_states[name]
        raise ArgumentError unless options
        @value_animation_state = name        # BEFORE animation makes it official
        animate(options, duration, &proc)
        self
    end

    # transitions like {:old => :new, :other => :fourth}
    def switch_state(transitions, duration=0.5, &proc)
        if (new_state = transitions[@value_animation_state])
            animate_to_state(new_state, duration, &proc)
            true
        else
            false
        end
    end
end