Module: Arrolio::Engine::MarginCollapse

Defined in:
lib/arrolio/engine/margin_collapse.rb

Overview

The engine's block-margin collapse rule — the ONE place the spacing between consecutive flowables is decided.

Current semantics (verified against the reference render): the incoming flowable's consumption is reduced by min(prev_space_after, curr_space_before). Because TextFlowable counts its margins inside consumed while ListFlowable-based flowables do not (see Flowable's margin contract), the EFFECTIVE gap works out to CSS max() only when curr.space_before <= prev.space_after; otherwise the gap under-shoots. The calibrated flavor spacing rides these quirks — unify only together with recalibration (TODO 96).

Class Method Summary collapse

Class Method Details

.overlap(prev_space_after, curr_space_before) ⇒ Object

The overlap subtracted from the incoming flowable's consumption: the previous flowable already charged its space-after into the cursor.



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# File 'lib/arrolio/engine/margin_collapse.rb', line 23

def overlap(prev_space_after, curr_space_before)
  [prev_space_after.to_f, curr_space_before.to_f].min
end