Class: Vice::Blitter

Inherits:
Object
  • Object
show all
Defined in:
lib/vice/blitter.rb

Instance Method Summary collapse

Constructor Details

#initialize(window) ⇒ Blitter

Returns a new instance of Blitter.



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# File 'lib/vice/blitter.rb', line 2

def initialize(window)
  Curses.init_pair 1, Curses::COLOR_BLACK, Curses::COLOR_WHITE
  window.attrset Curses.color_pair(0)
end

Instance Method Details

#drawalert(vice, window) ⇒ Object 



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# File 'lib/vice/blitter.rb', line 25

def drawalert(vice, window)
  window.setpos Curses.lines - 1, 0
  window.addstr ' ' * Curses.cols

  return if vice.msg.nil?

  window.setpos Curses.lines - 1, 0
  window.addstr '  ' + vice.msg

  vice.reset_alert
end

#drawbuffer(vice, window) ⇒ Object 



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# File 'lib/vice/blitter.rb', line 79

def drawbuffer(vice, window)
  buffer = vice.buffers[vice.current_buffer]
  visual_cursor = Vice::Cursor.new buffer.cursor.line, 0

  (0..buffer.cursor.col - 1).each do |i|
    visual_cursor.col += if buffer.currentline[i] == "\t"
               vice.config['tab_width']
             else
               1
             end
  end

  drawtabs vice, buffer, window

  @linenumwidth = buffer.lines.to_s.length + 1

  visual_cursor.line += 1 # space for tabs above buffer
  visual_cursor.line -= buffer.v_scroll
  visual_cursor.col += @linenumwidth + 1 # leave space for line numbers

  while visual_cursor.line >= Curses.lines - 2
    buffer.v_scroll += 1
    visual_cursor.line -= 1
  end

  while visual_cursor.line < 1
    buffer.v_scroll -= 1
    visual_cursor.line += 1
  end

  (1..Curses.lines - 2).each do |r|
    # r: on-screen line
    # i: in-buffer line
    i = r - 1 + buffer.v_scroll
    window.setpos r, 0
    if i < buffer.lines
      line = pad buffer.getline(i).gsub(/(\t)/, ' ' * vice.config['tab_width'])
      window.addstr formatnumber(i + 1) + line
    else
      window.addstr pad(formatnumber('~'))
    end
  end

  drawstatus vice.mode, window, buffer, vice.prompt

  drawalert vice, window

  if vice.mode == :prompt
    window.setpos Curses.lines - 2, vice.prompt.length + 2
  else
    window.setpos visual_cursor.line, visual_cursor.col
  end
  window.refresh
end

#drawstatus(mode, window, buffer, prompt) ⇒ Object 



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# File 'lib/vice/blitter.rb', line 37

def drawstatus(mode, window, buffer, prompt)
  window.attrset Curses.color_pair(1)

  # clear
  window.setpos Curses.lines - 2, 0
  window.addstr ' ' * Curses.cols

  # draw mode
  window.setpos Curses.lines - 2, 0
  modestring = if mode == :insert
           ' -- insert --'
         elsif mode == :prompt
           ' :' + prompt
         end
  window.addstr modestring

  # draw cursor position
  location = buffer.cursor.line.to_s + ',' + buffer.cursor.col.to_s
  window.setpos Curses.lines - 2, Curses.cols - location.length - 1
  window.addstr location

  window.attrset Curses.color_pair(0)
end

#drawtabs(vice, buffer, window) ⇒ Object 



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# File 'lib/vice/blitter.rb', line 7

def drawtabs(vice, buffer, window)
  window.attrset Curses.color_pair(1)
  window.setpos 0, 0
  window.addstr ' ' * Curses.cols
  window.setpos 0, 2
  vice.buffers.each do |b|
    window.attrset(Curses.color_pair(0) | Curses::A_BOLD) if b == buffer

    name = b.filename || '[no name]'
    name = b.modified ? '+ ' + name : name

    window.addstr ' ' + name + ' '

    window.attrset Curses.color_pair(1) if b == buffer
  end
  window.attrset Curses.color_pair(0)
end

#formatnumber(number) ⇒ Object 



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# File 'lib/vice/blitter.rb', line 61

def formatnumber(number)
  delta = if number == '~'
      @linenumwidth - 1
    else
      @linenumwidth - number.to_s.length
    end
  delta.times do
    number = ' ' + number.to_s
  end
  number += ' '
end

#pad(string) ⇒ Object 



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# File 'lib/vice/blitter.rb', line 73

def pad(string)
  delta = Curses.cols - string.length
  delta.times { string += ' ' } if delta > 0
  string
end