class Chamomile::Viewport

# File lib/chamomile/components/viewport.rb, line 9
def initialize(width: 80, height: 24, key_map: DEFAULT_KEY_MAP)
  @width = width
  @height = height
  @key_map = key_map
  @lines = []
  @y_offset = 0
  @x_offset = 0
  @mouse_wheel_enabled = true
  @mouse_wheel_delta = 3
  @soft_wrap = false
end

# File lib/chamomile/components/viewport.rb, line 133
def at_bottom?
  @y_offset >= max_scroll
end

# File lib/chamomile/components/viewport.rb, line 129
def at_top?
  @y_offset <= 0
end

# File lib/chamomile/components/viewport.rb, line 50
def content
  @lines.join("\n")
end

# File lib/chamomile/components/viewport.rb, line 38
def content=(s)
  @lines = s.to_s.split("\n", -1)
  clamp_offset
  @x_offset = @x_offset.clamp(0, [max_horizontal_scroll, 0].max) unless @soft_wrap
end

# File lib/chamomile/components/viewport.rb, line 143
def ensure_visible(line)
  if line < @y_offset
    self.y_offset = line
  elsif line >= @y_offset + @height
    self.y_offset = line - @height + 1
  end
  self
end

# File lib/chamomile/components/viewport.rb, line 92
def goto_bottom
  self.y_offset = max_scroll
end

# File lib/chamomile/components/viewport.rb, line 88
def goto_top
  self.y_offset = 0
end

# File lib/chamomile/components/viewport.rb, line 84
def half_page_down
  scroll_down(@height / 2)
end

# File lib/chamomile/components/viewport.rb, line 80
def half_page_up
  scroll_up(@height / 2)
end

# File lib/chamomile/components/viewport.rb, line 153
def handle(msg)
  case msg
  when Chamomile::KeyEvent
    handle_key(msg)
  when Chamomile::MouseEvent
    handle_mouse(msg)
  end

  nil
end

# File lib/chamomile/components/viewport.rb, line 30
def height=(new_height)
  @height = new_height
  clamp_offset
end

# File lib/chamomile/components/viewport.rb, line 120
def max_horizontal_scroll
  return 0 if @lines.empty?

  longest = @lines.map(&:length).max || 0
  [longest - @width, 0].max
end

# File lib/chamomile/components/viewport.rb, line 76
def page_down
  scroll_down(@height)
end

# File lib/chamomile/components/viewport.rb, line 72
def page_up
  scroll_up(@height)
end

# File lib/chamomile/components/viewport.rb, line 68
def scroll_down(n = 1)
  self.y_offset = @y_offset + n
end

# File lib/chamomile/components/viewport.rb, line 102
def scroll_left(n = 1)
  return if @soft_wrap

  self.x_offset = @x_offset - n
end

# File lib/chamomile/components/viewport.rb, line 137
def scroll_percent
  return 1.0 if max_scroll <= 0

  @y_offset.to_f / max_scroll
end

# File lib/chamomile/components/viewport.rb, line 108
def scroll_right(n = 1)
  return if @soft_wrap

  self.x_offset = @x_offset + n
end

# File lib/chamomile/components/viewport.rb, line 64
def scroll_up(n = 1)
  self.y_offset = @y_offset - n
end

# File lib/chamomile/components/viewport.rb, line 45
def set_content(s)
  self.content = s
  self
end

# File lib/chamomile/components/viewport.rb, line 54
def total_line_count
  @soft_wrap ? wrapped_lines.length : @lines.length
end

# File lib/chamomile/components/viewport.rb, line 167
def view
  if @soft_wrap
    render_soft_wrap
  else
    render_normal
  end
end

# File lib/chamomile/components/viewport.rb, line 58
def visible_line_count
  [total_line_count, @height].min
end

# File lib/chamomile/components/viewport.rb, line 21
def width=(new_width)
  @width = new_width
  clamp_offset
  @x_offset = @x_offset.clamp(0, [max_horizontal_scroll, 0].max) unless @soft_wrap
end

# File lib/chamomile/components/viewport.rb, line 114
def x_offset=(n)
  return if @soft_wrap

  @x_offset = n.clamp(0, [max_horizontal_scroll, 0].max)
end

# File lib/chamomile/components/viewport.rb, line 96
def y_offset=(n)
  @y_offset = n.clamp(0, max_scroll)
end