dispatchPointer
Dispatches event to the reverse paint-order hit path.
An empty tree returns InputResult.Ignored. A non-empty tree must be laid out with no pending measurement or layout work. If that precondition fails, the tree is poisoned. Hit testing uses half-open accumulated bounds without implicit parent clipping. The deepest and latest-painted hit node runs first. InputResult.Ignored bubbles to earlier candidates. InputResult.Consumed stops dispatch. A captured move or matching-button drag or release bypasses bounds and ancestor clips and stops propagation even when the owner returns ignored. Capture is acquired only by a capable node's consumed press and is cleared before the matching release callback. A callback failure poisons the tree only when it escapes the callback.
Return
consumed when a node handled the event, otherwise ignored.
Parameters
the event in tree coordinates.
Throws
when layout is incomplete or geometry remains pending. It is also thrown when the operation is called from another execution owner, re-enters an active operation, or the tree is not active.
when a pointer callback fails after pipeline work begins. The original throwable is propagated unchanged after cleanup attempts.