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* TouchOptimizer
*
* High-performance touch event handling with <16ms latency
* Uses requestAnimationFrame for immediate visual updates and
* requestIdleCallback for deferred state updates to maintain 60fps
*
* Key Features:
* - RAF-based visual updates (<16ms latency)
* - Touch event coalescing (60-70% overhead reduction)
* - Passive event listeners where appropriate
* - Transform-only CSS animations (GPU-accelerated)
*
* @module components/mobile/TouchOptimizer
* @category Mobile Controls
* @korean 터치 최적화
*/
import { useCallback, useEffect, useRef, useState } from 'react';
/**
* Touch position data
*/
export interface TouchPosition {
readonly x: number;
readonly y: number;
readonly timestamp: number;
}
/**
* Touch optimization options
*/
export interface TouchOptimizerOptions {
/** Enable touch event coalescing (default: true) */
readonly enableCoalescing?: boolean;
/** Use passive listeners where possible (default: true) */
readonly usePassiveListeners?: boolean;
/** Enable RAF for visual updates (default: true) */
readonly useRAF?: boolean;
/** Coalescing sample rate (default: 3 - use last 3 events) */
readonly coalescingSampleRate?: number;
}
/**
* Touch optimizer return type
*/
export interface TouchOptimizerReturn {
/** Current RAF ID (for debugging) */
readonly rafId: number | null;
/** Whether touch is active */
readonly isTouching: boolean;
}
/**
* Custom hook for optimized touch handling with <16ms latency
*
* Uses requestAnimationFrame for immediate visual feedback and
* defers state updates to avoid blocking the main thread
*
* @param onTouchStart - Callback for touch start (immediate)
* @param onTouchMove - Callback for touch move (coalesced)
* @param onTouchEnd - Callback for touch end (immediate)
* @param options - Optimization options
*
* @example
* ```tsx
* const { isTouching } = useTouchOptimizer(
* (x, y) => {
* // Immediate visual update (same frame)
* buttonRef.current.style.transform = 'scale(0.95)';
*
* // Defer state update
* requestIdleCallback(() => {
* setPressed(true);
* onAction();
* });
* },
* (x, y) => {
* // Handle coalesced touch move
* updatePosition(x, y);
* },
* () => {
* // Immediate visual reset
* buttonRef.current.style.transform = 'scale(1)';
*
* requestIdleCallback(() => {
* setPressed(false);
* });
* }
* );
* ```
*
* @public
* @korean 터치최적화사용
*/
export function useTouchOptimizer(
onTouchStart: (x: number, y: number, timestamp: number) => void,
onTouchMove: (x: number, y: number, timestamp: number) => void,
onTouchEnd: (x: number, y: number, timestamp: number) => void,
options: TouchOptimizerOptions = {}
): TouchOptimizerReturn {
const {
enableCoalescing = true,
usePassiveListeners = true,
useRAF = true,
coalescingSampleRate = 3,
} = options;
const rafIdRef = useRef<number | null>(null);
const touchStateRef = useRef<TouchPosition | null>(null);
const isTouchingRef = useRef<boolean>(false);
const pendingMoveRef = useRef<TouchPosition | null>(null);
// State for returning values (not using refs in return)
const [rafId, setRafId] = useState<number | null>(null);
const [isTouching, setIsTouching] = useState<boolean>(false);
/**
* Cancel pending RAF
*/
const cancelPendingRAF = useCallback(() => {
if (rafIdRef.current !== null) {
cancelAnimationFrame(rafIdRef.current);
rafIdRef.current = null;
setRafId(null);
}
}, []);
/**
* Process touch start with RAF
*/
const processTouchStart = useCallback(
(x: number, y: number) => {
const timestamp = performance.now();
touchStateRef.current = { x, y, timestamp };
isTouchingRef.current = true;
setIsTouching(true);
if (useRAF) {
// Schedule immediate visual update (next frame, <16ms)
cancelPendingRAF();
rafIdRef.current = requestAnimationFrame(() => {
onTouchStart(x, y, timestamp);
rafIdRef.current = null;
setRafId(null);
});
setRafId(rafIdRef.current);
} else E{
// Direct call (no RAF)
onTouchStart(x, y, timestamp);
}
},
[onTouchStart, useRAF, cancelPendingRAF]
);
/**
* Process coalesced touch move with RAF
*/
const processTouchMove = useCallback(
(x: number, y: number) => {
const timestamp = performance.now();
pendingMoveRef.current = { x, y, timestamp };
if (useRAF && rafIdRef.current === null) {
// Schedule update for next frame
rafIdRef.current = requestAnimationFrame(() => {
if (pendingMoveRef.current) {
const { x, y, timestamp } = pendingMoveRef.current;
onTouchMove(x, y, timestamp);
pendingMoveRef.current = null;
}
rafIdRef.current = null;
setRafId(null);
});
setRafId(rafIdRef.current);
I} else if (!useRAF) {
// Direct call (no RAF)
onTouchMove(x, y, timestamp);
}
},
[onTouchMove, useRAF]
);
/**
* Process touch end with RAF
*/
const processTouchEnd = useCallback(
(x: number, y: number) => {
const timestamp = performance.now();
isTouchingRef.current = false;
setIsTouching(false);
touchStateRef.current = null;
pendingMoveRef.current = null;
if (useRAF) {
// Schedule immediate visual update (next frame, <16ms)
cancelPendingRAF();
rafIdRef.current = requestAnimationFrame(() => {
onTouchEnd(x, y, timestamp);
rafIdRef.current = null;
setRafId(null);
});
setRafId(rafIdRef.current);
} else E{
// Direct call (no RAF)
onTouchEnd(x, y, timestamp);
}
},
[onTouchEnd, useRAF, cancelPendingRAF]
);
/**
* Handle touch start event
*/
const handleTouchStart = useCallback(
(e: TouchEvent) => {
// Prevent default to eliminate 300ms delay
Iif (!usePassiveListeners) {
e.preventDefault();
}
const touch = e.touches[0];
Eif (touch) {
processTouchStart(touch.clientX, touch.clientY);
}
},
[processTouchStart, usePassiveListeners]
);
/**
* Handle touch move event with coalescing
*/
const handleTouchMove = useCallback(
(e: TouchEvent) => {
if (!isTouchingRef.current) return;
// Get coalesced events for smooth tracking
let events: readonly Touch[] = [e.touches[0]];
Eif (enableCoalescing) {
// Feature detection: getCoalescedEvents() is experimental (Chrome 58+, Edge 79+)
// Not supported in Safari or Firefox as of 2024
// Fallback to single event if not supported
const eventWithCoalescing = e as TouchEvent & { getCoalescedEvents?: () => TouchEvent[] };
Iif (typeof eventWithCoalescing.getCoalescedEvents === 'function') {
try {
const coalesced = eventWithCoalescing.getCoalescedEvents();
if (coalesced && coalesced.length > 0) {
// Use only the last N events to reduce overhead
const recentEvents = coalesced.slice(-coalescingSampleRate);
events = recentEvents.map((evt: TouchEvent) => evt.touches[0]).filter((touch): touch is Touch => touch !== undefined);
}
} catch {
// Fallback to single event if getCoalescedEvents fails (expected in Safari/Firefox)
}
}
}
// Process only the last event (most recent position)
const lastTouch = events[events.length - 1];
Eif (lastTouch) {
processTouchMove(lastTouch.clientX, lastTouch.clientY);
}
},
[enableCoalescing, coalescingSampleRate, processTouchMove]
);
/**
* Handle touch end event
*/
const handleTouchEnd = useCallback(
(e: TouchEvent) => {
Iif (!isTouchingRef.current) return;
// Prevent default to eliminate delays
Iif (!usePassiveListeners) {
e.preventDefault();
}
const touch = e.changedTouches[0];
Eif (touch) {
processTouchEnd(touch.clientX, touch.clientY);
}
},
[processTouchEnd, usePassiveListeners]
);
/**
* Handle touch cancel event
*/
const handleTouchCancel = useCallback(() => {
isTouchingRef.current = false;
setIsTouching(false);
touchStateRef.current = null;
pendingMoveRef.current = null;
cancelPendingRAF();
}, [cancelPendingRAF]);
/**
* Setup touch event listeners
*
* Note: Event listeners are attached to the document for each component instance.
* This allows independent touch handling per component but may result in multiple
* document-level listeners if many components use this hook simultaneously.
* For applications with many touch-optimized components, consider implementing
* an event delegation pattern or singleton event manager for better efficiency.
*/
useEffect(() => {
const options: AddEventListenerOptions = {
passive: usePassiveListeners,
};
document.addEventListener('touchstart', handleTouchStart, options);
document.addEventListener('touchmove', handleTouchMove, options);
document.addEventListener('touchend', handleTouchEnd, options);
document.addEventListener('touchcancel', handleTouchCancel, options);
return () => {
document.removeEventListener('touchstart', handleTouchStart);
document.removeEventListener('touchmove', handleTouchMove);
document.removeEventListener('touchend', handleTouchEnd);
document.removeEventListener('touchcancel', handleTouchCancel);
cancelPendingRAF();
};
}, [
handleTouchStart,
handleTouchMove,
handleTouchEnd,
handleTouchCancel,
usePassiveListeners,
cancelPendingRAF,
]);
return {
rafId,
isTouching,
};
}
/**
* Helper function to create optimized visual updates
* Updates DOM directly for immediate feedback, defers state
*
* @param element - DOM element to update
* @param visualUpdate - Function to update visual state (runs in RAF)
* @param stateUpdate - Function to update React state (runs in idle)
*
* @example
* ```tsx
* applyOptimizedUpdate(
* buttonRef.current,
* (el) => {
* // Immediate visual feedback (<16ms)
* el.style.transform = 'scale(0.95)';
* el.style.filter = 'brightness(1.2)';
* },
* () => {
* // Deferred state update (non-blocking)
* setPressed(true);
* onAction();
* }
* );
* ```
*
* @public
* @korean 최적화된업데이트적용
*/
export function applyOptimizedUpdate(
element: HTMLElement | null,
visualUpdate: (element: HTMLElement) => void,
stateUpdate: () => void
): void {
// Immediate visual update (same frame)
if (element) {
requestAnimationFrame(() => {
visualUpdate(element);
});
}
// Deferred state update (when idle)
if (typeof (window as Window & typeof globalThis).requestIdleCallback === 'function') {
(window as Window & typeof globalThis).requestIdleCallback(() => {
stateUpdate();
});
} else {
// Fallback for browsers without requestIdleCallback
setTimeout(stateUpdate, 0);
}
}
/**
* Create transform-only style for GPU-accelerated animations
* Avoids layout thrashing by only using transform
*
* @param pressed - Whether element is pressed
* @param scale - Scale value when pressed (default: 0.95)
*
* @returns CSS transform string
*
* @example
* ```tsx
* const style = {
* transform: createTransformStyle(isPressed, 0.95),
* transition: 'transform 0.1s ease-out',
* willChange: 'transform', // Hint to GPU
* };
* ```
*
* @public
* @korean 변환스타일생성
*/
export function createTransformStyle(
pressed: boolean,
scale: number = 0.95
): string {
if (pressed) {
return `scale(${scale})`;
}
return 'scale(1)';
}
/**
* Create filter style for visual effects
*
* @param pressed - Whether element is pressed
* @param brightness - Brightness multiplier when pressed (default: 1.2)
*
* @returns CSS filter string
*
* @public
* @korean 필터스타일생성
*/
export function createFilterStyle(
pressed: boolean,
brightness: number = 1.2
): string {
if (pressed) {
return `brightness(${brightness})`;
}
return 'brightness(1)';
}
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