Module: Charming::Presentation::Layout

Defined in:
lib/charming/presentation/layout.rb

Overview

Layout contains generic screen-size math and composition helpers. It is intentionally unaware of application shells such as sidebars or nav panes.

Class Method Summary collapse

Class Method Details

.available_height(screen, reserved: 0, min: nil, max: nil) ⇒ Object 



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# File 'lib/charming/presentation/layout.rb', line 21

def available_height(screen, reserved: 0, min: nil, max: nil)
  clamp_size(screen.height - reserved, min: min, max: max)
end

.available_width(screen, reserved: 0, min: nil, max: nil) ⇒ Object 



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# File 'lib/charming/presentation/layout.rb', line 17

def available_width(screen, reserved: 0, min: nil, max: nil)
  clamp_size(screen.width - reserved, min: min, max: max)
end

.clamp_size(value, min: nil, max: nil) ⇒ Object 



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# File 'lib/charming/presentation/layout.rb', line 10

def clamp_size(value, min: nil, max: nil)
  size = value.to_i
  size = [size, min].max if min
  size = [size, max].min if max
  size
end

.selected_window_start(selected_index:, item_count:, window_size:) ⇒ Object 



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# File 'lib/charming/presentation/layout.rb', line 33

def selected_window_start(selected_index:, item_count:, window_size:)
  count = item_count.to_i
  size = [window_size.to_i, 1].max
  selected = selected_index.to_i.clamp(0, [count - 1, 0].max)
  max_start = [count - size, 0].max

  (selected - size + 1).clamp(0, max_start)
end

.stack_or_row(*blocks, narrow:, gap: 0) ⇒ Object 



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# File 'lib/charming/presentation/layout.rb', line 25

def stack_or_row(*blocks, narrow:, gap: 0)
  if narrow
    UI.join_vertical(*blocks, gap: gap)
  else
    UI.join_horizontal(*blocks, gap: gap)
  end
end