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277 278 279 280 | /** * Magnifier Context * * Provides magnifier state and utilities to child components, * avoiding deep prop drilling while maintaining type safety. * * This context consolidates: * - Magnifier visibility and expansion state * - Zoom state and animation * - Touch interaction state * - Cursor position and viewport calculations * - Interaction state machine * - Springs and animations */ 'use client' import type { SpringValue } from '@react-spring/web' import { createContext, type ReactNode, type RefObject, useContext, useMemo } from 'react' import type { UseInteractionStateMachineReturn } from '../interaction' // ============================================================================ // Types // ============================================================================ export interface MagnifierSpring { top: SpringValue<number> left: SpringValue<number> width: SpringValue<number> height: SpringValue<number> opacity: SpringValue<number> movementMultiplier: SpringValue<number> } export interface ParsedViewBox { x: number y: number width: number height: number } export interface SafeZoneMargins { top: number right: number bottom: number left: number } export interface PrecisionCalculations { isAtThreshold: boolean screenPixelRatio: number } // ============================================================================ // Context Value Type // ============================================================================ export interface MagnifierContextValue { // ------------------------------------------------------------------------- // Refs // ------------------------------------------------------------------------- /** Container element ref */ containerRef: RefObject<HTMLDivElement> /** SVG element ref */ svgRef: RefObject<SVGSVGElement> /** Magnifier element ref */ magnifierRef: RefObject<HTMLDivElement> /** Cursor position ref (mutable) */ cursorPositionRef: React.MutableRefObject<{ x: number; y: number } | null> /** Scale probe 1 ref (for empirical scale measurement) */ scaleProbe1Ref: RefObject<SVGCircleElement> /** Scale probe 2 ref (for empirical scale measurement) */ scaleProbe2Ref: RefObject<SVGCircleElement> /** Anchor probe ref (for closed-loop 1:1 tracking) */ anchorProbeRef: RefObject<SVGCircleElement> /** Anchor SVG position - set on touch start, probe stays at this SVG coord */ anchorSvgPositionRef: React.MutableRefObject<{ x: number; y: number } | null> // ------------------------------------------------------------------------- // Position & Animation // ------------------------------------------------------------------------- /** Current cursor position in container coordinates (from state machine) */ cursorPosition: { x: number; y: number } | null // Note: setCursorPosition removed - dispatch to interaction state machine instead /** Zoom spring value */ zoomSpring: SpringValue<number> /** Magnifier position/opacity springs */ magnifierSpring: MagnifierSpring /** Parsed viewBox dimensions */ parsedViewBox: ParsedViewBox /** Safe zone margins for UI elements */ safeZoneMargins: SafeZoneMargins // ------------------------------------------------------------------------- // Magnifier State // ------------------------------------------------------------------------- /** Whether magnifier is visible */ showMagnifier: boolean /** Set magnifier visibility */ setShowMagnifier: (show: boolean) => void /** Whether magnifier is expanded (full size) */ isMagnifierExpanded: boolean /** Set magnifier expansion */ setIsMagnifierExpanded: (expanded: boolean) => void /** Target opacity for magnifier */ targetOpacity: number /** Set target opacity */ setTargetOpacity: (opacity: number) => void /** Target zoom level */ targetZoom: number /** Set target zoom */ setTargetZoom: (zoom: number) => void // ------------------------------------------------------------------------- // Interaction State Machine // ------------------------------------------------------------------------- /** Full interaction state machine return */ interaction: UseInteractionStateMachineReturn // ------------------------------------------------------------------------- // Derived Interaction State (convenience) // ------------------------------------------------------------------------- /** Whether mobile map dragging triggered the magnifier */ mobileMapDragTriggeredMagnifier: boolean /** Whether mobile map is being dragged */ isMobileMapDragging: boolean /** Whether magnifier is being dragged */ isMagnifierDragging: boolean /** Whether pointer is locked (precision mode) */ pointerLocked: boolean // ------------------------------------------------------------------------- // Device & Theme // ------------------------------------------------------------------------- /** Whether dark mode is active */ isDark: boolean /** Whether device is touch-based */ isTouchDevice: boolean /** Whether device supports precision mode (pointer lock) */ canUsePrecisionMode: boolean // ------------------------------------------------------------------------- // Precision Mode // ------------------------------------------------------------------------- /** Precision mode threshold */ precisionModeThreshold: number /** Precision calculations */ precisionCalcs: PrecisionCalculations // ------------------------------------------------------------------------- // Zoom Controls // ------------------------------------------------------------------------- /** Get current zoom level (from spring) */ getCurrentZoom: () => number /** High zoom threshold for styling changes */ highZoomThreshold: number } // ============================================================================ // Context Creation // ============================================================================ const MagnifierContext = createContext<MagnifierContextValue | null>(null) // ============================================================================ // Provider Component // ============================================================================ export interface MagnifierProviderProps { children: ReactNode value: MagnifierContextValue } /** * Provider for Magnifier context. * * This provider should wrap the magnifier overlay and related components * to provide shared state without prop drilling. * * @example * ```tsx * <MagnifierProvider value={magnifierContextValue}> * <MagnifierOverlay /> * <ZoomLinesOverlay /> * </MagnifierProvider> * ``` */ export function MagnifierProvider({ children, value }: MagnifierProviderProps) { // Memoize the value to prevent unnecessary re-renders // Only re-create when key values change const memoizedValue = useMemo( () => value, [ // Refs (stable) value.containerRef, value.svgRef, value.magnifierRef, value.cursorPositionRef, value.scaleProbe1Ref, value.scaleProbe2Ref, value.anchorProbeRef, value.anchorSvgPositionRef, // Position & Animation value.cursorPosition, value.zoomSpring, value.magnifierSpring, value.parsedViewBox, value.safeZoneMargins, // Magnifier State value.showMagnifier, value.setShowMagnifier, value.isMagnifierExpanded, value.setIsMagnifierExpanded, value.targetOpacity, value.setTargetOpacity, value.targetZoom, value.setTargetZoom, // Interaction State Machine value.interaction, // Derived State value.mobileMapDragTriggeredMagnifier, value.isMobileMapDragging, value.isMagnifierDragging, value.pointerLocked, // Device & Theme value.isDark, value.isTouchDevice, value.canUsePrecisionMode, // Precision Mode value.precisionModeThreshold, value.precisionCalcs, // Zoom value.getCurrentZoom, value.highZoomThreshold, ] ) return <MagnifierContext.Provider value={memoizedValue}>{children}</MagnifierContext.Provider> } // ============================================================================ // Hooks // ============================================================================ /** * Access Magnifier context. * * @throws Error if used outside of MagnifierProvider * @returns Magnifier context value * * @example * ```tsx * function MagnifierControls() { * const { showMagnifier, isMagnifierExpanded, isDark } = useMagnifierContext() * // ... * } * ``` */ export function useMagnifierContext(): MagnifierContextValue { const context = useContext(MagnifierContext) if (!context) { throw new Error('useMagnifierContext must be used within a MagnifierProvider') } return context } /** * Safely access Magnifier context (returns null if not available). * * Useful for components that can optionally use the context. * * @returns Magnifier context value or null */ export function useMagnifierContextSafe(): MagnifierContextValue | null { return useContext(MagnifierContext) } |