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require "prawn/core/text/formatted/line_wrap"
require "prawn/core/text/formatted/arranger"
module Prawn
module Core
module Text
module Formatted #:nodoc:
module Wrap #:nodoc:
def initialize(array, options)
@line_wrap = Prawn::Core::Text::Formatted::LineWrap.new
@arranger = Prawn::Core::Text::Formatted::Arranger.new(@document,
:kerning => options[:kerning])
end
# See the developer documentation for Prawn::Core::Text#wrap
#
# Formatted#wrap should set the following variables:
# <tt>@line_height</tt>::
# the height of the tallest fragment in the last printed line
# <tt>@descender</tt>::
# the descender height of the tallest fragment in the last
# printed line
# <tt>@ascender</tt>::
# the ascender heigth of the tallest fragment in the last
# printed line
# <tt>@baseline_y</tt>::
# the baseline of the current line
# <tt>@nothing_printed</tt>::
# set to true until something is printed, then false
# <tt>@everything_printed</tt>::
# set to false until everything printed, then true
#
# Returns any formatted text that was not printed
#
def wrap(array) #:nodoc:
initialize_wrap(array)
stop = false
while !stop
# wrap before testing if enough height for this line because the
# height of the highest fragment on this line will be used to
# determine the line height
@line_wrap.wrap_line(:document => @document,
:kerning => @kerning,
:width => available_width,
:arranger => @arranger)
if enough_height_for_this_line?
move_baseline_down
print_line
else
stop = true
end
stop ||= @single_line || @arranger.finished?
end
@text = @printed_lines.join("\n")
@everything_printed = @arranger.finished?
@arranger.unconsumed
end
private
def print_line
@nothing_printed = false
printed_fragments = []
fragments_this_line = []
word_spacing = word_spacing_for_this_line
while fragment = @arranger.retrieve_fragment
fragment.word_spacing = word_spacing
if fragment.text == "\n"
printed_fragments << "\n" if @printed_lines.last == ""
break
end
printed_fragments << fragment.text
fragments_this_line << fragment
end
accumulated_width = 0
fragments_this_line.reverse! if @direction == :rtl
fragments_this_line.each do |fragment|
fragment.default_direction = @direction
format_and_draw_fragment(fragment, accumulated_width,
@line_wrap.width, word_spacing)
accumulated_width += fragment.width
end
if "".respond_to?(:force_encoding)
printed_fragments.map! { |s| s.force_encoding("utf-8") }
end
@printed_lines << printed_fragments.join
end
def word_spacing_for_this_line
if @align == :justify &&
@line_wrap.space_count > 0 &&
!@line_wrap.paragraph_finished?
(available_width - @line_wrap.width) / @line_wrap.space_count
else
0
end
end
def enough_height_for_this_line?
@line_height = @arranger.max_line_height
@descender = @arranger.max_descender
@ascender = @arranger.max_ascender
if @baseline_y == 0
diff = @ascender + @descender
else
diff = @descender + @line_height + @leading
end
required_total_height = @baseline_y.abs + diff
if required_total_height > @height + 0.0001
# no room for the full height of this line
@arranger.repack_unretrieved
false
else
true
end
end
def initialize_wrap(array)
@text = nil
@arranger.format_array = array
# these values will depend on the maximum value within a given line
@line_height = 0
@descender = 0
@ascender = 0
@baseline_y = 0
@printed_lines = []
@nothing_printed = true
@everything_printed = false
end
def format_and_draw_fragment(fragment, accumulated_width,
line_width, word_spacing)
@arranger.apply_color_and_font_settings(fragment) do
draw_fragment(fragment, accumulated_width,
line_width, word_spacing)
end
end
end
end
end
end
end
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