ShadowViewMutationList calculateShadowViewMutations(
const ShadowNode &oldRootShadowNode,
const ShadowNode &newRootShadowNode
) {
// Root shadow nodes must have same tag.
assert(oldRootShadowNode.getTag() == newRootShadowNode.getTag());
ShadowViewMutationList mutations;
if (oldRootShadowNode != newRootShadowNode) {
mutations.push_back(
ShadowViewMutation::UpdateMutation(
ShadowView(),
ShadowView(oldRootShadowNode),
ShadowView(newRootShadowNode),
-1
)
);
}
calculateShadowViewMutations(
mutations,
ShadowView(oldRootShadowNode),
sliceChildShadowNodeViewPairs(oldRootShadowNode),
sliceChildShadowNodeViewPairs(newRootShadowNode)
);
return mutations;
}
LayoutMetrics UIManager::getRelativeLayoutMetrics(
const ShadowNode &shadowNode,
const ShadowNode *ancestorShadowNode) const {
SystraceSection s("UIManager::getRelativeLayoutMetrics");
if (!ancestorShadowNode) {
shadowTreeRegistry_->visit(
shadowNode.getSurfaceId(), [&](const ShadowTree &shadowTree) {
shadowTree.tryCommit(
[&](const SharedRootShadowNode &oldRootShadowNode) {
ancestorShadowNode = oldRootShadowNode.get();
return nullptr;
});
});
}
auto layoutableShadowNode =
dynamic_cast<const LayoutableShadowNode *>(&shadowNode);
auto layoutableAncestorShadowNode =
dynamic_cast<const LayoutableShadowNode *>(ancestorShadowNode);
if (!layoutableShadowNode || !layoutableAncestorShadowNode) {
return EmptyLayoutMetrics;
}
return layoutableShadowNode->getRelativeLayoutMetrics(
*layoutableAncestorShadowNode);
}
ShadowView::ShadowView(const ShadowNode &shadowNode):
componentName(shadowNode.getComponentName()),
componentHandle(shadowNode.getComponentHandle()),
tag(shadowNode.getTag()),
props(shadowNode.getProps()),
eventEmitter(shadowNode.getEventEmitter()),
layoutMetrics(layoutMetricsFromShadowNode(shadowNode)),
localData(shadowNode.getLocalData()) {}
static void sliceChildShadowNodeViewPairsRecursively(ShadowViewNodePairList &pairList, Point layoutOffset, const ShadowNode &shadowNode) {
for (const auto &childShadowNode : shadowNode.getChildren()) {
auto shadowView = ShadowView(*childShadowNode);
const auto layoutableShadowNode = dynamic_cast<const LayoutableShadowNode *>(childShadowNode.get());
if (layoutableShadowNode && layoutableShadowNode->isLayoutOnly()) {
sliceChildShadowNodeViewPairsRecursively(
pairList,
layoutOffset + shadowView.layoutMetrics.frame.origin,
*childShadowNode
);
} else {
shadowView.layoutMetrics.frame.origin += layoutOffset;
pairList.push_back({shadowView, *childShadowNode});
}
}
}
