Module: Marvi::Renderer::Curses::TabBar

Defined in:
lib/marvi/renderer/curses/tab_bar.rb

Overview

Pure layout computation for the tab bar so it can be tested without a terminal. Tabs are packed greedily left to right and wrap to a new row when the screen width is exceeded, producing a multi-row bar.

Defined Under Namespace

Classes: Item

Class Method Summary collapse

Class Method Details

.item_at(items, y, x) ⇒ Object 



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# File 'lib/marvi/renderer/curses/tab_bar.rb', line 41

def item_at(items, y, x)
  items.find { |item| item.contains?(y, x) }
end

.item_for_click(items, y, x) ⇒ Object

Resolve a click including the margin row directly below the bar, which is attributed to the tab above it — a taller click target.



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# File 'lib/marvi/renderer/curses/tab_bar.rb', line 47

def item_for_click(items, y, x)
  item_at(items, y, x) || ((y == rows(items)) ? item_at(items, y - 1, x) : nil)
end

.layout(labels, screen_width) ⇒ Object 



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# File 'lib/marvi/renderer/curses/tab_bar.rb', line 20

def layout(labels, screen_width)
  screen_width = [screen_width, 1].max
  row = 0
  col = 0
  labels.each_with_index.map do |label, index|
    text = truncate_to_width(" #{label} ", screen_width)
    width = Unicode::DisplayWidth.of(text)
    if col.positive? && col + width > screen_width
      row += 1
      col = 0
    end
    item = Item.new(index: index, text: text, row: row, col: col, width: width)
    col += width
    item
  end
end

.rows(items) ⇒ Object 



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# File 'lib/marvi/renderer/curses/tab_bar.rb', line 37

def rows(items)
  items.empty? ? 0 : items.last.row + 1
end

.truncate_to_width(text, max_width) ⇒ Object 



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# File 'lib/marvi/renderer/curses/tab_bar.rb', line 51

def truncate_to_width(text, max_width)
  return text if Unicode::DisplayWidth.of(text) <= max_width

  result = +""
  width = 0
  text.each_char do |ch|
    ch_width = Unicode::DisplayWidth.of(ch)
    break if width + ch_width > max_width

    result << ch
    width += ch_width
  end
  result
end