Module: Thaum::HitTest

Defined in:
lib/thaum/hit_test.rb

Overview

Mouse hit testing for the layout tree and modals.

Class Method Summary collapse

Class Method Details

.hit(app:, abs_x:, abs_y:) ⇒ Object

Walk every leaf Sigil with an allocated rect, return the LAST one whose rect contains (abs_x, abs_y). Last-in-render-order wins on overlap, matching the draw walk in Painter.



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# File 'lib/thaum/hit_test.rb', line 11

def hit(app:, abs_x:, abs_y:)
  hit = nil
  Tree.walk(app) do |node|
    next unless node.is_a?(Sigil)

    rect = node.rect or next
    next unless point_in_rect?(x: abs_x, y: abs_y, rect: rect)

    hit = node
  end
  hit
end

.point_in_rect?(x:, y:, rect:) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/thaum/hit_test.rb', line 24

def point_in_rect?(x:, y:, rect:)
  x >= rect.x && x < rect.x + rect.width && y >= rect.y && y < rect.y + rect.height
end