This paper introduces a formal model for "Pointer Focus Registration," defined as the computational process of mapping a continuous, high-frequency spatial input stream (the pointer) to a discrete, stateful interface context (the focus). While contemporary Human-Computer Interaction (HCI) literature extensively covers target acquisition (Fitts’ Law) and event handling, the underlying registration mechanics—specifically the translation of raw coordinate streams into focus locks—remains under-specifed. We propose a unified architecture that addresses temporal desynchronization, sub-pixel jitter, and the "race condition" inherent in rapid traversal. We present a "Phase-Locked Focus Algorithm" (PLFA) capable of predictive focus registration, reducing cognitive load by minimizing focus thrashing during high-velocity input. Theoretical bounds and implementation schematics are provided.
You cannot understand pointer focus until you see its three dominant, warring paradigms. pointer focus registration code
// 4. Garbage Collection (Remove low confidence candidates) PruneCandidates(); This paper introduces a formal model for "Pointer
You click a button. It highlights. You type, and text appears. It feels instantaneous, obvious, even banal. We present a "Phase-Locked Focus Algorithm" (PLFA) capable
Most bugs live in the gray zone between implicit and grab-based registration.
