module Rabbit::Renderer::Display::ScrollHandler

# File lib/rabbit/renderer/display/scroll-handler.rb, line 23
def initialize(*args, &block)
  super
  init_scroll_handler
end

# File lib/rabbit/renderer/display/scroll-handler.rb, line 29
def init_scroll_handler
end

# File lib/rabbit/renderer/display/scroll-handler.rb, line 35
def set_scroll_event(widget)
  scroll = Gtk::EventControllerScroll.new([:both_axes])
  scroll.signal_connect(:scroll) do |_, dx, dy|
    if dy.zero?
      false
    else
      if dy.positive?
        direction = Gdk::ScrollDirection::UP
      else
        direction = Gdk::ScrollDirection::DOWN
      end
      event = ScrollEvent.new(direction)
      handled = call_hook_procs(@scroll_hook_procs, event)
      unless handled
        if direction == Gdk::ScrollDirection::UP
          @canvas.activate("NextSlide")
        else
          @canvas.activate("PreviousSlide")
        end
      end
      true
    end
  end
  widget.add_controller(scroll)
end