module Rabbit::Renderer::Display::Spotlight

# File lib/rabbit/renderer/display/spotlight.rb, line 21
def initialize(canvas)
  super
  init_spotlight
end

# File lib/rabbit/renderer/display/spotlight.rb, line 40
def spotlighting?
  @spotlighting
end

# File lib/rabbit/renderer/display/spotlight.rb, line 26
def toggle_spotlight
  @spotlighting = !@spotlighting
  if spotlighting?
    grab
    @spotlight_center_x ||= 0
    @spotlight_center_y ||= 0
  else
    ungrab
    @spotlight_center_x = nil
    @spotlight_center_y = nil
  end
  queue_draw
end

# File lib/rabbit/renderer/display/spotlight.rb, line 103
def draw_spotlight
  return unless spotlighting?
  radius = width * @spotlight_radius_ratio
  base = [
          @spotlight_center_x - radius / 8,
          @spotlight_center_y,
          radius / 6,
          @spotlight_center_x + radius / 8,
          @spotlight_center_y,
          radius,
         ]
  color_stops = [
                 [0, 1, 1, 1, 0],
                 [0.7, 0, 0, 0, 0.8],
                 [1, 0, 0, 0, 0.8],
                ]
  params = {
    :pattern => {
      :type => :radial,
      :base => base,
      :color_stops => color_stops,
    }
  }
  draw_rectangle(true, 0, 0, size.real_width, size.real_height, nil, params)
end

# File lib/rabbit/renderer/display/spotlight.rb, line 45
def init_spotlight
  @spotlighting = false

  @spotlight_radius_ratio = 0.1
  @spotlight_center_x = nil
  @spotlight_center_y = nil

  add_button_press_hook do |event|
    is_target = lambda do
      return false unless event.button == 3
      if Gdk::EventType.const_defined?(:BUTTON2_PRESS)
        event.event_type == Gdk::EventType::BUTTON2_PRESS
      else
        event.event_type == Gdk::EventType::BUTTON_PRESS and
          event.n_presses == 2
      end
    end
    if is_target.call
      add_button_handler do
        @spotlight_center_x = event.x
        @spotlight_center_y = event.y
        @canvas.activate("ToggleSpotlight")
        clear_button_handler
        true
      end
    end
    false
  end

  add_motion_notify_hook do |x, y|
    if spotlighting?
      @spotlight_center_x = x
      @spotlight_center_y = y
      queue_draw
      true
    else
      false
    end
  end

  add_scroll_hook do |event|
    if spotlighting?
      case event.direction
      when Gdk::ScrollDirection::UP
        @spotlight_radius_ratio =
          [0.1, @spotlight_radius_ratio - 0.1].max
      when Gdk::ScrollDirection::DOWN
        @spotlight_radius_ratio =
          [1, @spotlight_radius_ratio + 0.1].min
      end
      queue_draw
      true
    else
      false
    end
  end
end