/**
* Handles a manageChildren call. This may translate into multiple manageChildren calls for
* multiple other views.
*
* <p>NB: the assumption for calling this method is that all corresponding ReactShadowNodes have
* been updated **but tagsToDelete have NOT been deleted yet**. This is because we need to use the
* metadata from those nodes to figure out the correct commands to dispatch. This is unlike all
* other calls on this class where we assume all operations on the shadow hierarchy have already
* completed by the time a corresponding method here is called.
*/
public void handleManageChildren(
ReactShadowNode nodeToManage,
int[] indicesToRemove,
int[] tagsToRemove,
ViewAtIndex[] viewsToAdd,
int[] tagsToDelete) {
if (!ENABLED) {
mUIViewOperationQueue.enqueueManageChildren(
nodeToManage.getReactTag(), indicesToRemove, viewsToAdd, tagsToDelete);
return;
}
// We operate on tagsToRemove instead of indicesToRemove because by the time this method is
// called, these views have already been removed from the shadow hierarchy and the indices are
// no longer useful to operate on
for (int i = 0; i < tagsToRemove.length; i++) {
int tagToRemove = tagsToRemove[i];
boolean delete = false;
for (int j = 0; j < tagsToDelete.length; j++) {
if (tagsToDelete[j] == tagToRemove) {
delete = true;
break;
}
}
ReactShadowNode nodeToRemove = mShadowNodeRegistry.getNode(tagToRemove);
removeNodeFromParent(nodeToRemove, delete);
}
for (int i = 0; i < viewsToAdd.length; i++) {
ViewAtIndex toAdd = viewsToAdd[i];
ReactShadowNode nodeToAdd = mShadowNodeRegistry.getNode(toAdd.mTag);
addNodeToNode(nodeToManage, nodeToAdd, toAdd.mIndex);
}
}
/**
* For handling node removal from manageChildren. In the case of removing a layout-only node, we
* need to instead recursively remove all its children from their native parents.
*/
private void removeNodeFromParent(ReactShadowNode nodeToRemove, boolean shouldDelete) {
ReactShadowNode nativeNodeToRemoveFrom = nodeToRemove.getNativeParent();
if (nativeNodeToRemoveFrom != null) {
int index = nativeNodeToRemoveFrom.indexOfNativeChild(nodeToRemove);
nativeNodeToRemoveFrom.removeNativeChildAt(index);
mUIViewOperationQueue.enqueueManageChildren(
nativeNodeToRemoveFrom.getReactTag(),
new int[] {index},
null,
shouldDelete ? new int[] {nodeToRemove.getReactTag()} : null);
} else {
for (int i = nodeToRemove.getChildCount() - 1; i >= 0; i--) {
removeNodeFromParent(nodeToRemove.getChildAt(i), shouldDelete);
}
}
}
private void transitionLayoutOnlyViewToNativeView(
ReactShadowNode node, @Nullable CatalystStylesDiffMap props) {
ReactShadowNode parent = node.getParent();
if (parent == null) {
node.setIsLayoutOnly(false);
return;
}
// First, remove the node from its parent. This causes the parent to update its native children
// count. The removeNodeFromParent call will cause all the view's children to be detached from
// their native parent.
int childIndex = parent.indexOf(node);
parent.removeChildAt(childIndex);
removeNodeFromParent(node, false);
node.setIsLayoutOnly(false);
// Create the view since it doesn't exist in the native hierarchy yet
mUIViewOperationQueue.enqueueCreateView(
node.getRootNode().getReactTag(), node.getReactTag(), node.getViewClass(), props);
// Add the node and all its children as if we are adding a new nodes
parent.addChildAt(node, childIndex);
addNodeToNode(parent, node, childIndex);
for (int i = 0; i < node.getChildCount(); i++) {
addNodeToNode(node, node.getChildAt(i), i);
}
// Update layouts since the children of the node were offset by its x/y position previously.
// Bit of a hack: we need to update the layout of this node's children now that it's no longer
// layout-only, but we may still receive more layout updates at the end of this batch that we
// don't want to ignore.
Assertions.assertCondition(mTagsWithLayoutVisited.size() == 0);
applyLayoutBase(node);
for (int i = 0; i < node.getChildCount(); i++) {
applyLayoutBase(node.getChildAt(i));
}
mTagsWithLayoutVisited.clear();
}
