Method update

valdi/src/valdi/runtime/Attributes/ViewNodeAttribute.cpp:342–398

}

Result<Void> ViewNodeAttribute::update(ViewTransactionScope& viewTransactionScope,
                                       ViewNode* viewNode,
                                       bool hasView,
                                       bool justAddedView,
                                       const Ref<Animator>& animator) {
    auto needValue = !empty() && (!_handlerNeedsView || hasView);

    if (needValue) {
        if (!_hasAppliedValue || _appliedValueDirty) {
            _hasAppliedValue = true;
            _appliedValueDirty = false;

            auto pendingAnimatedValue = std::move(_pendingAnimatedValue);

            auto result = getResolvedPreprocessedValue();
            if (!result) {
                return result.moveError();
            }

            // The intention here is to only apply the attribute values that are supposed to describe the initial
            // pre-animation state of the view, but got captured in the view's "appearing in the viewport" animation
            bool shouldForceApplyWithoutAnimation = pendingAnimatedValue == nullptr && justAddedView;
            if (shouldForceApplyWithoutAnimation) {
                return _handler->applyAttribute(viewTransactionScope, *viewNode, result.value(), nullptr);
            }
            auto flushResult =
                flushPendingAnimatedValue(viewTransactionScope, viewNode, pendingAnimatedValue, animator != nullptr);

            auto applyResult = _handler->applyAttribute(viewTransactionScope, *viewNode, result.value(), animator);

            if (!applyResult) {
                return applyResult;
            }

            if (!flushResult) {
                return flushResult;
            }
        }

        return Void();
    } else {
        if (_hasAppliedValue) {
            _hasAppliedValue = false;
            _appliedValueDirty = false;

            auto pendingAnimatedValue = std::move(_pendingAnimatedValue);
            auto flushResult =
                flushPendingAnimatedValue(viewTransactionScope, viewNode, pendingAnimatedValue, animator != nullptr);

            _handler->resetAttribute(viewTransactionScope, *viewNode, animator);

            return flushResult;
        }

        return Void();
    }
}