Class: SlideField::Viewer

Inherits:
Gosu::Window
  • Object
show all
Defined in:
lib/slidefield/viewer.rb

Constant Summary collapse

LOAD_AROUND =

preloader settings

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LOAD_DELAY = 
1000

Instance Method Summary collapse

Constructor Details

#initialize(project) ⇒ Viewer

Returns a new instance of Viewer.



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# File 'lib/slidefield/viewer.rb', line 6

def initialize(project)
  layout = project[:layout].first
  layout_size = layout.get :size
  fullscreen = layout.get :fullscreen

  super *layout_size, fullscreen

  @time = 0
  @animator = SlideField::Animator.new layout_size

  @slides = []
  project[:slide].each {|slide_data|
    manager = SlideField::ObjectManager.new slide_data, self
    @slides << manager
  }

  change_slide 0
end

Instance Method Details

#button_down(id) ⇒ Object 



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# File 'lib/slidefield/viewer.rb', line 58

def button_down(id)
  case id
  when Gosu::KbHome
    change_slide 0
  when Gosu::KbEnd
    change_slide @slides.length-1
  when
    Gosu::KbReturn,
    Gosu::KbSpace,
    Gosu::KbTab,
    Gosu::KbRight,
    Gosu::KbDown,
    Gosu::KbPageDown,
    Gosu::KbNumpadAdd

    change_slide @current+1
  when
    Gosu::KbBackspace,
    Gosu::KbLeft,
    Gosu::KbUp,
    Gosu::KbPageUp,
    Gosu::KbNumpadSubtract

    change_slide @current-1
  when Gosu::KbEscape, Gosu::KbQ
    close
  end
end

#change_slide(index) ⇒ Object 



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# File 'lib/slidefield/viewer.rb', line 87

def change_slide(index)
  return if @current == index || index < 0 || index > @slides.length-1

  @previous = @current
  @current = index

  if @previous
    @slides[@previous].deactivate
    @forward = @previous < @current
  else
    @forward = true
  end

  @slides[@current].load unless @slides[@current].loaded?
  @slides[@current].activate
  @animator.reset
end

#draw ⇒ Object 



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# File 'lib/slidefield/viewer.rb', line 41

def draw
  # animate the previous slide
  if @previous && @animator.need_redraw?
    @animator.frame @time, false, @forward do
      @slides[@previous].draw @animator
    end
  end

  @animator.frame @time, true, @forward do
    @slides[@current].draw @animator
  end
end

#needs_redraw? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/slidefield/viewer.rb', line 54

def needs_redraw?
  @animator.need_redraw?
end

#update ⇒ Object 



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# File 'lib/slidefield/viewer.rb', line 25

def update
  now = Gosu::milliseconds

  unless needs_redraw?
    if now - @time > LOAD_DELAY && @can_preload
      smart_loader
      @can_preload = false
    end

    return
  end

  @time = now
  @can_preload = true
end