markNeedsPaint method

void markNeedsPaint()

Mark this render object as needing to be repainted.

This will cause paint to be called during the next paint pass. The paint request propagates up to the root on first mark, where it requests a visual update. Subsequent calls while already dirty short-circuit after re-requesting a visual update (same frame-skip concern as markNeedsLayout).

Implementation

void markNeedsPaint() {
  if (_needsPaint) {
    owner?.requestVisualUpdate();
    return;
  }
  _needsPaint = true;

  if (parent != null) {
    // Continue propagation up the tree
    parent!.markNeedsPaint();
  } else {
    // We're the root - always request visual update to ensure a frame
    // gets scheduled, even if the flag was already set
    owner?.requestVisualUpdate();
  }
}