Class: Arrolio::Flowables::TwoColumnBlock

Inherits:
Arrolio::Flowable show all
Defined in:
lib/arrolio/flowables/two_column_block.rb

Overview

Two-column layout for a cover-page header. Renders left and right content blocks side-by-side without table borders, matching the reference PDF's two-column fo:table layout. Used by flow builders to place flavor-specific cover text in two columns.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Arrolio::Flowable

#do_split, #keep_together?, #keep_with_next?, #page_break_after?, #page_break_before?, #space_after, #space_before, #split, #splittable?

Constructor Details

#initialize(left_flowables:, right_flowables:, left_ratio: 0.5, style: Style::Definition.new) ⇒ TwoColumnBlock

left_flowables: Array of TextFlowable for the left column. right_flowables: Array of TextFlowable for the right column. left_ratio: Fraction of width for the left column (default 0.5).



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# File 'lib/arrolio/flowables/two_column_block.rb', line 15

def initialize(left_flowables:, right_flowables:, left_ratio: 0.5,
               style: Style::Definition.new)
  super(style: style)
  @left_flowables = Array(left_flowables)
  @right_flowables = Array(right_flowables)
  @left_ratio = left_ratio.to_f
end

Instance Attribute Details

#left_flowables ⇒ Object (readonly)

Returns the value of attribute left_flowables.



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# File 'lib/arrolio/flowables/two_column_block.rb', line 10

def left_flowables
  @left_flowables
end

#left_ratio ⇒ Object (readonly)

Returns the value of attribute left_ratio.



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# File 'lib/arrolio/flowables/two_column_block.rb', line 10

def left_ratio
  @left_ratio
end

#right_flowables ⇒ Object (readonly)

Returns the value of attribute right_flowables.



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# File 'lib/arrolio/flowables/two_column_block.rb', line 10

def right_flowables
  @right_flowables
end

#style ⇒ Object (readonly)

Returns the value of attribute style.



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# File 'lib/arrolio/flowables/two_column_block.rb', line 10

def style
  @style
end

Instance Method Details

#emit(x, y, width, context = nil) ⇒ Object 



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# File 'lib/arrolio/flowables/two_column_block.rb', line 31

def emit(x, y, width, context = nil)
  left_w = width * @left_ratio
  right_w = width * (1.0 - @left_ratio)
  right_x = x + left_w
  boxes = []

  left_cursor = y
  @left_flowables.each do |f|
    fboxes, consumed = f.emit(x, left_cursor, left_w, context)
    boxes.concat(fboxes)
    left_cursor -= consumed
  end

  right_cursor = y
  @right_flowables.each do |f|
    fboxes, consumed = f.emit(right_x, right_cursor, right_w, context)
    boxes.concat(fboxes)
    right_cursor -= consumed
  end

  consumed = [y - left_cursor, y - right_cursor].max
  [boxes, consumed]
end

#height(width, context = nil) ⇒ Object 



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# File 'lib/arrolio/flowables/two_column_block.rb', line 23

def height(width, context = nil)
  left_w = width * @left_ratio
  right_w = width * (1.0 - @left_ratio)
  left_h = @left_flowables.sum { |f| f.height(left_w, context) }
  right_h = @right_flowables.sum { |f| f.height(right_w, context) }
  [left_h, right_h].max
end