lighttroupe/luz-next

class Keyboard
    SHIFT_KEYS = ['left shift', 'right shift']
    boolean_accessor :shift_down

    def initialize(gui)
        @gui = gui
    end

    def raw_key_up(key)
        @shift_down = false if SHIFT_KEYS.include?(key)
    end

    def raw_key_down(key)
        @shift_down = true if SHIFT_KEYS.include?(key)

        if @grab_proc
            #$gui.positive_message "proc"
            @grab_proc.call(key)
        elsif @grab_object && !@grab_object.hidden?        # NOTE object can hide and unhide
            #$gui.positive_message "o:#{@grab_object}"
            @grab_object.on_key_press(key)
        else
            @gui.on_key_press(key)
        end
    end

    def grab(object=nil, &proc)
        @grab_object, @grab_proc = object, proc
    end

    def cancel_grab!
        cancel_grab_silently!
        @gui.default_focus!        # alert the world!
    end

    def cancel_grab_silently!
        @grab_object, @grab_proc = nil, nil
    end

    def grabbed_by_object?(object)
        !@grab_object.nil? && object == @grab_object        # not true when nils
    end
end