Class: TuiTui::FocusRing

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

Overview

Immutable focus state for a fixed set of targets.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*targets, current: nil) ⇒ FocusRing

Returns a new instance of FocusRing.

Raises:

  • (ArgumentError) 


8
9
10
11
12
13
 
# File 'lib/tui_tui/focus_ring.rb', line 8

def initialize(*targets, current: nil)
  @targets = targets.flatten.freeze
  raise ArgumentError, "FocusRing needs at least one target" if @targets.empty?

  @current = current || @targets.first
end

Instance Attribute Details

#current ⇒ Object (readonly)

Returns the value of attribute current.



6
7
8
 
# File 'lib/tui_tui/focus_ring.rb', line 6

def current
  @current
end

Instance Method Details

#focus(target) ⇒ Object 



21
22
23
 
# File 'lib/tui_tui/focus_ring.rb', line 21

def focus(target)
  @targets.include?(target) ? self.class.new(@targets, current: target) : self
end

#focused?(target) ⇒ Boolean

Returns:

  • (Boolean) 


15
 
# File 'lib/tui_tui/focus_ring.rb', line 15

def focused?(target) = @current == target

#next ⇒ Object 



17
18
19
 
# File 'lib/tui_tui/focus_ring.rb', line 17

def next
  focus(@targets[(@targets.index(@current) + 1) % @targets.size])
end