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.positive?
	string
end