markDescendantNeedsPaint method

@override void markDescendantNeedsPaint()

Called when a descendant render object's paint output has changed.

Viewport render objects override this to invalidate their paint cache so the next paint call re-renders the child subtree.

Implementation

@override
void markDescendantNeedsPaint() {
  super.markDescendantNeedsPaint();
  _needsRepaint = true;
  _invalidateVisiblePaintCache();
}