Class: TuiTui::CanvasRenderer

Inherits:
Object
  • Object
show all
Defined in:
lib/tui_tui/canvas_renderer.rb

Overview

Terminal-facing row rendering and diff helpers for Canvas.

Instance Method Summary collapse

Constructor Details

#initialize(canvas) ⇒ CanvasRenderer

Returns a new instance of CanvasRenderer.



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# File 'lib/tui_tui/canvas_renderer.rb', line 6

def initialize(canvas)
  @canvas = canvas
end

Instance Method Details

#changed_span(previous, row) ⇒ Object 



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# File 'lib/tui_tui/canvas_renderer.rb', line 14

def changed_span(previous, row)
  mine = @canvas.grid_row(row)
  theirs = previous.grid_row(row)
  first = last = nil
  mine.each_index do |i|
    next if mine[i] == theirs[i]

    first ||= i
    last = i
  end

  return nil if first.nil?

  first -= 1 while first.positive? && mine[first].continuation?
  [first + 1, last + 1]
end

#render_row(row, from: 1, to: @canvas.cols, depth: :ansi256, enabled: true) ⇒ Object 



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# File 'lib/tui_tui/canvas_renderer.rb', line 31

def render_row(row, from: 1, to: @canvas.cols, depth: :ansi256, enabled: true)
  out = +""
  run = +""
  run_style = :none
  @canvas.grid_row(row)[(from - 1)..(to - 1)].each do |cell|
    next if cell.continuation?

    if run_style != :none && run_style != cell.style
      out << paint(run, run_style, depth, enabled)
      run = +""
    end

    run_style = cell.style
    run << cell.char
  end

  out << paint(run, run_style, depth, enabled) unless run.empty?
  out
end

#same_size?(other_canvas) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tui_tui/canvas_renderer.rb', line 10

def same_size?(other_canvas)
  other_canvas.rows == @canvas.rows && other_canvas.cols == @canvas.cols
end