clearsightstudio/ProMotion-menu

module ProMotion; module Menu
  module Transition

     VISUAL_STATES = {
      # Creates a slide and scale visual state block that gives an experience
      # similar to Mailbox.app. It scales from 90% to 100%, and translates 50
      # pixels in the x direction. In addition, it also sets alpha from 0.0 to 1.0.
      slide_and_scale: MMDrawerVisualState.slideAndScaleVisualStateBlock,

      # Creates a slide visual state block that gives the user an experience that
      # slides at the same speed of the center view controller during animation.
      # This is equal to calling parallaxVisualStateBlockWithParallaxFactor: with
      # a parallax factor of 1.0. This is similar to the menu in Spotify's app.
      slide: MMDrawerVisualState.slideVisualStateBlock,

      # Creates a parallax experience that slides the side drawer view controller
      # at a different rate than the center view controller during animation. For
      # every parallaxFactor of points moved by the center view controller, the side
      # drawer view controller will move 1 point. Passing in 1.0 is the equivalent
      # of a applying a sliding animation, while passing in 'MAX_FLOAT' is the equivalent
      # of having no animation at all.
      parallax: MMDrawerVisualState.parallaxVisualStateBlockWithParallaxFactor(3),

      # Creates a swinging door visual state block that gives the user an experience that
      # animates the drawer in along the hinge.
      swinging_door: MMDrawerVisualState.swingingDoorVisualStateBlock
    }

    def transition_animation=(visual_block)
      # Parallax requires a parallax_factor. Set it by passing the visual_block
      # block in with underscore parallax_factor attached to the end. i.e.
      # transition_animation = :parallax_6 for parallax_factor 6.
      self.setDrawerVisualStateBlock(mask_for_transition(visual_block))
    end

    def mask_for_transition(visual_block)
      unless visual_block.nil?
        if visual_block.include? "parallax"
          parallax_factor = visual_block.include?("_") ? visual_block.split("_")[1].to_i : 3
          visual_state = MMDrawerVisualState.parallaxVisualStateBlockWithParallaxFactor(parallax_factor)
        end
      end
      visual_state ||= VISUAL_STATES[visual_block]
      visual_state
    end

  end
end; end