Function ygDirtiedCallback

valdi/src/valdi/runtime/Context/ViewNode.cpp:3725–3742

}

void ViewNode::setMaintainScrollAnchor(bool maintain) {
    auto& scrollState = getOrCreateScrollState();
    scrollState.setMaintainScrollAnchor(maintain);
}

void ViewNode::setPreserveScrollPosition(bool preserve) {
    auto& scrollState = getOrCreateScrollState();
    scrollState.setPreserveScrollPosition(preserve);
    // Capture the anchor immediately on enable, from the current (still valid, pre-insertion)
    // layout. Otherwise the anchor stays empty until the next scroll/layout pass; if that pass is
    // a content insertion (live message / forward page), Step 1 in updateScrollState would be
    // skipped (no anchor) and the viewport would jump before the anchor is first recorded.
    if (preserve && _calculatedFrame.height > 0.0f) {
        refreshPreserveAnchor(
            this, scrollState, scrollState.getDirectionAgnosticContentOffset().y, _calculatedFrame.height);
    }
}

template<typename F>
void ViewNode::updateViewportExtension(F&& handler) {
    auto& scrollState = getOrCreateScrollState();