Class: Yatte::Overlay

Inherits:
Object
  • Object
show all
Defined in:
lib/yatte/overlay.rb

Overview

Abstract base for modal overlay pickers (file finder, project search, …). Subclasses override: #prepare (optional), #fetch(query), #inner_width_cap, #title_for(items), #render_row(item, inner_width, selected:).

Direct Known Subclasses

FileFinderOverlay, ProjectSearchOverlay

Instance Method Summary collapse

Constructor Details

#initialize(terminal:, input:, background:) ⇒ Overlay

Returns a new instance of Overlay.



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# File 'lib/yatte/overlay.rb', line 8

def initialize(terminal:, input:, background:)
  @terminal = terminal
  @input = input
  @background = background
end

Instance Method Details

#pick ⇒ Object

Runs the modal loop. Returns the chosen item (via #fetch) or nil on cancel.



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# File 'lib/yatte/overlay.rb', line 15

def pick
  prepare
  query = +""
  selected = 0
  scroll_offset = 0
  items = fetch(query)
  query_changed = false

  loop do
    if query_changed
      items = fetch(query)
      query_changed = false
    end
    selected = selected.clamp(0, [items.length - 1, 0].max)

    rows, = @terminal.size
    visible_count = [rows - 7, 1].max

    scroll_offset = selected if selected < scroll_offset
    if selected >= scroll_offset + visible_count
      scroll_offset = selected - visible_count + 1
    end

    draw(query, items, selected, scroll_offset, visible_count)

    key = @input.read_keypress
    case key
    when :enter
      return items[selected]
    when :escape
      return nil
    when :backspace
      unless query.empty?
        query.chop!
        query_changed = true
        selected = 0
        scroll_offset = 0
      end
    when :arrow_up
      selected -= 1 if selected > 0
    when :arrow_down
      selected += 1 if selected < items.length - 1
    when String
      query << key
      query_changed = true
      selected = 0
      scroll_offset = 0
    end
  end
end