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The accessibility recorder polls focus every ~250ms, missing fast transitions and reacting late. wait_for_focus_change blocks on the native AddFocusChangedEventHandler and returns the moment focus moves - zero-latency, miss-free, the accessibility-tree analogue of wait_for_window. The real event handler is registered/unregistered under a lock on the calling thread (COMObject + queue). Extends the backend ABC + Windows UIA backend via the fake-backend seam.
Add ax_events: reactive UIA focus-change wait
Up to standards ✅🟢 Issues
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| Metric | Results |
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| Complexity | 23 |
| Duplication | 0 |
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Release: native-UIA depth, part 3 (v202) — lane complete
Final piece of the ROUND-15 native Windows UI (UIA) depth lane.
ax_events(v202, Add ax_events: reactive UIA focus-change wait #424) —wait_for_focus_change: block on the nativeAddFocusChangedEventHandlerand return the moment focus moves — the zero-latency, miss-free reactive wait (vs the ~250 ms polling recorder), registered/unregistered under a lock on the calling thread.Native-UIA depth lane complete (v195–v202, 8 features)
virtualized(realize off-screen items) ·ax_props(rich properties) ·table_pattern(headers + cell addressing) ·transform_window(move/resize + window state) ·legacy_accessible(MSAA bridge) · advancedax_text(find/select/attributes) ·selection_view(selection + views) ·ax_events(reactive focus wait).All extend the accessibility backend ABC + Windows UIA backend through the same injectable fake-backend seam (headless-testable; real UIA gated to Windows). EN/Zh docs + WHATS_NEW included.