Class: Yatte::Screen

Inherits:
Object
  • Object
show all
Defined in:
lib/yatte/screen.rb

Constant Summary collapse

THROTTLE_MS =

~60fps

16

Instance Method Summary collapse

Constructor Details

#initialize(terminal) ⇒ Screen

Returns a new instance of Screen.



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# File 'lib/yatte/screen.rb', line 7

def initialize(terminal)
  @terminal = terminal
  @last_render_time = 0.0
  @previous_lines = []
  @previous_size = nil
  @force_redraw = true
end

Instance Method Details

#force_redraw! ⇒ Object 



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# File 'lib/yatte/screen.rb', line 81

def force_redraw!
  @force_redraw = true
end

#refresh(context, force: false) ⇒ Object 



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# File 'lib/yatte/screen.rb', line 15

def refresh(context, force: false)
  now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  elapsed_ms = (now - @last_render_time) * 1000
  unless force || @force_redraw || elapsed_ms >= THROTTLE_MS
    return
  end

  buffer = context.buffer
  cursor = context.cursor
  tabs = context.tabs
  git_status = context.git_status

  rows, cols = @terminal.size
  current_size = [rows, cols]
  if @previous_size != current_size
    @force_redraw = true
    @previous_size = current_size
  end

  tab_bar_height = (tabs && tabs.length > 1) ? 1 : 0
  text_rows = rows - 2 - tab_bar_height
  git_gutter = git_status ? 1 : 0
  gutter_width = gutter_width_for(buffer.line_count) + git_gutter
  text_cols = cols - gutter_width

  cursor.scroll(text_rows, text_cols)

  # Build all lines
  new_lines = []
  if tab_bar_height > 0
    new_lines << build_tab_bar(tabs, context.active_tab_index, cols)
  end
  text_rows.times do |i|
    file_row = i + cursor.row_offset
    new_lines << if file_row >= buffer.line_count
      build_empty_row(buffer, cursor, i, text_rows, cols)
    else
      build_text_row(buffer, file_row, cursor, gutter_width,
        text_cols, cols, context.selection, context.bracket_match,
        context.language, git_status)
    end
  end
  new_lines << build_status_bar(context.filename, context.dirty,
    buffer, cursor, cols)
  new_lines << build_message_bar(context.message, context.message_time,
    cols)

  # Diff and write only changed lines
  buf = +""
  buf << Yatte::HIDE_CURSOR

  new_lines.each_with_index do |line, i|
    if @force_redraw || i >= @previous_lines.length || @previous_lines[i] != line
      buf << "\x1b[#{i + 1};1H" << line << Yatte::CLEAR
    end
  end

  position_cursor(buf, cursor, gutter_width, tab_bar_height)
  buf << Yatte::SHOW_CURSOR

  @terminal.write(buf)
  @previous_lines = new_lines
  @force_redraw = false
  @last_render_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
end

#text_area_size(tab_count: 1) ⇒ Object 



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# File 'lib/yatte/screen.rb', line 85

def text_area_size(tab_count: 1)
  rows, cols = @terminal.size
  gutter_width = 5
  tab_bar_height = (tab_count > 1) ? 1 : 0
  [rows - 2 - tab_bar_height, cols - gutter_width]
end