{"version":3,"file":"index.cjs","sources":["../src/lib/types.ts","../src/lib/manifest.ts","../src/lib/actions.ts","../src/lib/reducer.ts","../src/lib/zoom-plugin.ts","../src/lib/handlers/marquee-zoom.handler.ts","../src/lib/index.ts"],"sourcesContent":["import { BasePluginConfig, EventHook } from '@embedpdf/core';\nimport { Rect } from '@embedpdf/models';\nimport { ViewportMetrics } from '@embedpdf/plugin-viewport';\n\n/* ------------------------------------------------------------------ */\n/* public */\n/* ------------------------------------------------------------------ */\n\nexport enum ZoomMode {\n Automatic = 'automatic',\n FitPage = 'fit-page',\n FitWidth = 'fit-width',\n}\n\nexport type ZoomLevel = ZoomMode | number;\n\nexport interface Point {\n vx: number;\n vy: number;\n}\n\nexport interface ZoomChangeEvent {\n documentId: string;\n /** old and new *actual* scale factors */\n oldZoom: number;\n newZoom: number;\n /** level used to obtain the newZoom (number | mode) */\n level: ZoomLevel;\n /** viewport point kept under the finger / mouse‑wheel focus */\n center: Point;\n /** where the viewport should scroll to after the scale change */\n desiredScrollLeft: number;\n desiredScrollTop: number;\n /** metrics at the moment the zoom was requested */\n viewport: ViewportMetrics;\n}\n\nexport interface StateChangeEvent {\n documentId: string;\n state: ZoomDocumentState;\n}\n\nexport interface MarqueeZoomCallback {\n onPreview?: (rect: Rect | null) => void;\n onCommit?: (rect: Rect) => void;\n onSmallDrag?: () => void;\n}\n\nexport interface RegisterMarqueeOnPageOptions {\n documentId: string;\n pageIndex: number;\n scale: number;\n callback: MarqueeZoomCallback;\n}\n\n// Per-document zoom state\nexport interface ZoomDocumentState {\n zoomLevel: ZoomLevel; // last **requested** level\n currentZoomLevel: number; // actual numeric factor\n isMarqueeZoomActive: boolean; // whether marquee zoom mode is active\n}\n\n// Scoped zoom capability\nexport interface ZoomScope {\n requestZoom(level: ZoomLevel, center?: Point): void;\n requestZoomBy(delta: number, center?: Point): void;\n zoomIn(): void;\n zoomOut(): void;\n zoomToArea(pageIndex: number, rect: Rect): void;\n enableMarqueeZoom(): void;\n disableMarqueeZoom(): void;\n toggleMarqueeZoom(): void;\n isMarqueeZoomActive(): boolean;\n getState(): ZoomDocumentState;\n onZoomChange: EventHook;\n onStateChange: EventHook;\n}\n\nexport interface ZoomCapability {\n // Active document operations\n requestZoom(level: ZoomLevel, center?: Point): void;\n requestZoomBy(delta: number, center?: Point): void;\n zoomIn(): void;\n zoomOut(): void;\n zoomToArea(pageIndex: number, rect: Rect): void;\n enableMarqueeZoom(): void;\n disableMarqueeZoom(): void;\n toggleMarqueeZoom(): void;\n isMarqueeZoomActive(): boolean;\n getState(): ZoomDocumentState;\n\n // Document-scoped operations\n forDocument(documentId: string): ZoomScope;\n\n // Global\n registerMarqueeOnPage: (opts: RegisterMarqueeOnPageOptions) => () => void;\n getPresets(): ZoomPreset[];\n\n // Events (include documentId)\n onZoomChange: EventHook;\n onStateChange: EventHook;\n}\n\n/* ------------------------------------------------------------------ */\n/* config / store */\n/* ------------------------------------------------------------------ */\n\nexport interface ZoomRangeStep {\n min: number;\n max: number;\n step: number;\n}\n\nexport interface ZoomPreset {\n name: string;\n value: ZoomLevel;\n icon?: string;\n}\n\nexport interface ZoomPluginConfig extends BasePluginConfig {\n defaultZoomLevel: ZoomLevel;\n minZoom?: number;\n maxZoom?: number;\n zoomStep?: number;\n zoomRanges?: ZoomRangeStep[];\n presets?: ZoomPreset[];\n}\n\nexport interface ZoomState {\n // Per-document zoom state\n documents: Record;\n activeDocumentId: string | null;\n}\n\nexport enum VerticalZoomFocus {\n Center,\n Top,\n}\n\nexport interface ZoomRequest {\n level: ZoomLevel;\n delta?: number;\n center?: Point;\n focus?: VerticalZoomFocus;\n align?: 'keep' | 'center';\n}\n","import { PluginManifest } from '@embedpdf/core';\n\nimport { ZoomMode, ZoomPluginConfig } from './types';\n\nexport const ZOOM_PLUGIN_ID = 'zoom';\n\nexport const manifest: PluginManifest = {\n id: ZOOM_PLUGIN_ID,\n name: 'Zoom Plugin',\n version: '1.0.0',\n provides: ['zoom'],\n requires: ['viewport', 'scroll'],\n optional: ['interaction-manager', 'spread'],\n defaultConfig: {\n defaultZoomLevel: ZoomMode.Automatic,\n minZoom: 0.2,\n maxZoom: 60,\n zoomStep: 0.1,\n zoomRanges: [\n {\n min: 0.2,\n max: 0.5,\n step: 0.05,\n },\n {\n min: 0.5,\n max: 1.0,\n step: 0.1,\n },\n {\n min: 1.0,\n max: 2.0,\n step: 0.2,\n },\n {\n min: 2.0,\n max: 4.0,\n step: 0.4,\n },\n {\n min: 4.0,\n max: 10.0,\n step: 0.8,\n },\n {\n min: 10.0,\n max: 20.0,\n step: 1.6,\n },\n {\n min: 20.0,\n max: 40.0,\n step: 3.2,\n },\n {\n min: 40.0,\n max: 60.0,\n step: 6.4,\n },\n ],\n presets: [\n {\n name: 'Fit Page',\n value: ZoomMode.FitPage,\n },\n {\n name: 'Fit Width',\n value: ZoomMode.FitWidth,\n },\n {\n name: 'Automatic',\n value: ZoomMode.Automatic,\n },\n {\n name: '25%',\n value: 0.25,\n },\n {\n name: '50%',\n value: 0.5,\n },\n {\n name: '100%',\n value: 1,\n },\n {\n name: '125%',\n value: 1.25,\n },\n {\n name: '150%',\n value: 1.5,\n },\n {\n name: '200%',\n value: 2,\n },\n {\n name: '400%',\n value: 4,\n },\n {\n name: '800%',\n value: 8,\n },\n {\n name: '1600%',\n value: 16,\n },\n ],\n },\n};\n","import { Action } from '@embedpdf/core';\nimport { ZoomLevel, ZoomDocumentState } from './types';\n\n// Document lifecycle\nexport const INIT_ZOOM_STATE = 'ZOOM/INIT_STATE';\nexport const CLEANUP_ZOOM_STATE = 'ZOOM/CLEANUP_STATE';\nexport const SET_ACTIVE_DOCUMENT = 'ZOOM/SET_ACTIVE_DOCUMENT';\n\n// Per-document actions\nexport const SET_ZOOM_LEVEL = 'ZOOM/SET_ZOOM_LEVEL';\nexport const SET_MARQUEE_ZOOM_ACTIVE = 'ZOOM/SET_MARQUEE_ZOOM_ACTIVE';\n\n// Document lifecycle actions\nexport interface InitZoomStateAction extends Action {\n type: typeof INIT_ZOOM_STATE;\n payload: {\n documentId: string;\n state: ZoomDocumentState;\n };\n}\n\nexport interface CleanupZoomStateAction extends Action {\n type: typeof CLEANUP_ZOOM_STATE;\n payload: string; // documentId\n}\n\nexport interface SetActiveDocumentAction extends Action {\n type: typeof SET_ACTIVE_DOCUMENT;\n payload: string | null; // documentId\n}\n\nexport interface SetZoomLevelAction extends Action {\n type: typeof SET_ZOOM_LEVEL;\n payload: {\n documentId: string;\n zoomLevel: ZoomLevel;\n currentZoomLevel: number;\n };\n}\n\nexport interface SetMarqueeZoomActiveAction extends Action {\n type: typeof SET_MARQUEE_ZOOM_ACTIVE;\n payload: {\n documentId: string;\n isActive: boolean;\n };\n}\n\nexport type ZoomAction =\n | InitZoomStateAction\n | CleanupZoomStateAction\n | SetActiveDocumentAction\n | SetZoomLevelAction\n | SetMarqueeZoomActiveAction;\n\n// Action Creators\nexport function initZoomState(documentId: string, state: ZoomDocumentState): InitZoomStateAction {\n return { type: INIT_ZOOM_STATE, payload: { documentId, state } };\n}\n\nexport function cleanupZoomState(documentId: string): CleanupZoomStateAction {\n return { type: CLEANUP_ZOOM_STATE, payload: documentId };\n}\n\nexport function setActiveDocument(documentId: string | null): SetActiveDocumentAction {\n return { type: SET_ACTIVE_DOCUMENT, payload: documentId };\n}\n\nexport function setZoomLevel(\n documentId: string,\n zoomLevel: ZoomLevel,\n currentZoomLevel: number,\n): SetZoomLevelAction {\n return { type: SET_ZOOM_LEVEL, payload: { documentId, zoomLevel, currentZoomLevel } };\n}\n\nexport function setMarqueeZoomActive(\n documentId: string,\n isActive: boolean,\n): SetMarqueeZoomActiveAction {\n return { type: SET_MARQUEE_ZOOM_ACTIVE, payload: { documentId, isActive } };\n}\n","import { Reducer } from '@embedpdf/core';\nimport {\n ZoomAction,\n INIT_ZOOM_STATE,\n CLEANUP_ZOOM_STATE,\n SET_ACTIVE_DOCUMENT,\n SET_ZOOM_LEVEL,\n SET_MARQUEE_ZOOM_ACTIVE,\n} from './actions';\nimport { ZoomState, ZoomDocumentState, ZoomMode } from './types';\n\nexport const initialDocumentState: ZoomDocumentState = {\n zoomLevel: ZoomMode.Automatic,\n currentZoomLevel: 1,\n isMarqueeZoomActive: false,\n};\n\nexport const initialState: ZoomState = {\n documents: {},\n activeDocumentId: null,\n};\n\nexport const zoomReducer: Reducer = (state = initialState, action) => {\n switch (action.type) {\n case INIT_ZOOM_STATE: {\n const { documentId, state: docState } = action.payload;\n return {\n ...state,\n documents: {\n ...state.documents,\n [documentId]: docState,\n },\n // Set as active if no active document\n activeDocumentId: state.activeDocumentId ?? documentId,\n };\n }\n\n case CLEANUP_ZOOM_STATE: {\n const documentId = action.payload;\n const { [documentId]: removed, ...remainingDocs } = state.documents;\n return {\n ...state,\n documents: remainingDocs,\n activeDocumentId: state.activeDocumentId === documentId ? null : state.activeDocumentId,\n };\n }\n\n case SET_ACTIVE_DOCUMENT: {\n return {\n ...state,\n activeDocumentId: action.payload,\n };\n }\n\n case SET_ZOOM_LEVEL: {\n const { documentId, zoomLevel, currentZoomLevel } = action.payload;\n const docState = state.documents[documentId];\n if (!docState) return state;\n\n return {\n ...state,\n documents: {\n ...state.documents,\n [documentId]: {\n ...docState,\n zoomLevel,\n currentZoomLevel,\n },\n },\n };\n }\n\n case SET_MARQUEE_ZOOM_ACTIVE: {\n const { documentId, isActive } = action.payload;\n const docState = state.documents[documentId];\n if (!docState) return state;\n\n return {\n ...state,\n documents: {\n ...state.documents,\n [documentId]: {\n ...docState,\n isMarqueeZoomActive: isActive,\n },\n },\n };\n }\n\n default:\n return state;\n }\n};\n","import {\n BasePlugin,\n PluginRegistry,\n createEmitter,\n clamp,\n setScale,\n createBehaviorEmitter,\n Listener,\n} from '@embedpdf/core';\nimport { ScrollPlugin, ScrollCapability } from '@embedpdf/plugin-scroll';\nimport { ViewportPlugin, ViewportCapability, ViewportMetrics } from '@embedpdf/plugin-viewport';\n\nimport {\n initZoomState,\n cleanupZoomState,\n setZoomLevel,\n ZoomAction,\n setMarqueeZoomActive,\n} from './actions';\nimport {\n ZoomPluginConfig,\n ZoomState,\n ZoomMode,\n Point,\n ZoomChangeEvent,\n ZoomCapability,\n ZoomPreset,\n ZoomRangeStep,\n VerticalZoomFocus,\n ZoomRequest,\n RegisterMarqueeOnPageOptions,\n ZoomScope,\n StateChangeEvent,\n ZoomDocumentState,\n} from './types';\nimport {\n InteractionManagerCapability,\n InteractionManagerPlugin,\n} from '@embedpdf/plugin-interaction-manager';\nimport { SpreadCapability, SpreadPlugin } from '@embedpdf/plugin-spread';\nimport { Rect, rotateRect } from '@embedpdf/models';\nimport { createMarqueeHandler } from './handlers';\nimport { initialDocumentState } from './reducer';\n\nexport class ZoomPlugin extends BasePlugin<\n ZoomPluginConfig,\n ZoomCapability,\n ZoomState,\n ZoomAction\n> {\n static readonly id = 'zoom' as const;\n\n private readonly zoom$ = createEmitter();\n private readonly state$ = createBehaviorEmitter();\n private readonly viewport: ViewportCapability;\n private readonly viewportPlugin: ViewportPlugin;\n private readonly scroll: ScrollCapability;\n private readonly interactionManager: InteractionManagerCapability | null;\n private readonly spread: SpreadCapability | null;\n private readonly presets: ZoomPreset[];\n private readonly zoomRanges: ZoomRangeStep[];\n private readonly defaultZoomLevel: ZoomMode | number;\n\n private readonly minZoom: number;\n private readonly maxZoom: number;\n private readonly zoomStep: number;\n\n constructor(id: string, registry: PluginRegistry, cfg: ZoomPluginConfig) {\n super(id, registry);\n\n this.viewportPlugin = registry.getPlugin('viewport')!;\n this.viewport = this.viewportPlugin.provides();\n this.scroll = registry.getPlugin('scroll')!.provides();\n const interactionManager = registry.getPlugin('interaction-manager');\n this.interactionManager = interactionManager?.provides() ?? null;\n const spread = registry.getPlugin('spread');\n this.spread = spread?.provides() ?? null;\n\n this.minZoom = cfg.minZoom ?? 0.25;\n this.maxZoom = cfg.maxZoom ?? 10;\n this.zoomStep = cfg.zoomStep ?? 0.1;\n this.defaultZoomLevel = cfg.defaultZoomLevel;\n this.presets = cfg.presets ?? [];\n this.zoomRanges = this.normalizeRanges(cfg.zoomRanges ?? []);\n\n // Keep automatic modes up to date per document\n this.viewport.onViewportResize(\n (event) => this.recalcAuto(event.documentId, VerticalZoomFocus.Top),\n {\n mode: 'debounce',\n wait: 150,\n keyExtractor: (event) => event.documentId,\n },\n );\n\n // Subscribe to spread changes\n this.spread?.onSpreadChange((event) => {\n this.recalcAuto(event.documentId, VerticalZoomFocus.Top);\n });\n\n // Register marquee zoom mode\n this.interactionManager?.registerMode({\n id: 'marqueeZoom',\n scope: 'page',\n exclusive: true,\n cursor: 'zoom-in',\n });\n\n this.interactionManager?.onModeChange((state) => {\n // Track marquee zoom state changes for this document\n const isMarqueeActive = state.activeMode === 'marqueeZoom';\n const docState = this.getDocumentState(state.documentId);\n\n // Only dispatch if state actually changed\n if (docState && docState.isMarqueeZoomActive !== isMarqueeActive) {\n this.dispatch(setMarqueeZoomActive(state.documentId, isMarqueeActive));\n }\n });\n }\n\n // ─────────────────────────────────────────────────────────\n // Document Lifecycle Hooks (from BasePlugin)\n // ─────────────────────────────────────────────────────────\n\n protected override onDocumentLoadingStarted(documentId: string): void {\n this.viewport.gate('zoom', documentId);\n // Initialize zoom state for this document\n const docState: ZoomDocumentState = {\n ...initialDocumentState,\n zoomLevel: this.defaultZoomLevel,\n };\n\n this.dispatch(initZoomState(documentId, docState));\n\n this.logger.debug(\n 'ZoomPlugin',\n 'DocumentOpened',\n `Initialized zoom state for document: ${documentId}`,\n );\n }\n\n protected override onDocumentLoaded(documentId: string): void {\n // Apply initial zoom after document is fully loaded\n this.recalcAuto(documentId, VerticalZoomFocus.Top);\n }\n\n protected override onDocumentClosed(documentId: string): void {\n this.dispatch(cleanupZoomState(documentId));\n\n this.logger.debug(\n 'ZoomPlugin',\n 'DocumentClosed',\n `Cleaned up zoom state for document: ${documentId}`,\n );\n }\n\n protected override onRotationChanged(documentId: string): void {\n // Recalculate auto modes when rotation changes\n this.recalcAuto(documentId, VerticalZoomFocus.Top);\n }\n\n /*\n protected override onPagesChanged(documentId: string): void {\n // Recalculate auto modes when pages change\n this.recalcAuto(documentId, VerticalZoomFocus.Top);\n }*/\n\n // ─────────────────────────────────────────────────────────\n // Capability\n // ─────────────────────────────────────────────────────────\n\n protected buildCapability(): ZoomCapability {\n return {\n // Active document operations\n requestZoom: (level, c) => this.requestZoom(level, c),\n requestZoomBy: (d, c) => this.requestZoomBy(d, c),\n zoomIn: () => this.zoomIn(),\n zoomOut: () => this.zoomOut(),\n zoomToArea: (pageIndex, rect) => this.zoomToArea(pageIndex, rect),\n enableMarqueeZoom: () => this.enableMarqueeZoom(),\n disableMarqueeZoom: () => this.disableMarqueeZoom(),\n toggleMarqueeZoom: () => this.toggleMarqueeZoom(),\n isMarqueeZoomActive: () => this.isMarqueeZoomActive(),\n getState: () => this.getDocumentStateOrThrow(),\n\n // Document-scoped operations\n forDocument: (documentId: string) => this.createZoomScope(documentId),\n\n // Global\n registerMarqueeOnPage: (opts) => this.registerMarqueeOnPage(opts),\n getPresets: () => this.presets,\n\n // Events\n onZoomChange: this.zoom$.on,\n onStateChange: this.state$.on,\n };\n }\n\n // ─────────────────────────────────────────────────────────\n // Document Scoping\n // ─────────────────────────────────────────────────────────\n\n private createZoomScope(documentId: string): ZoomScope {\n return {\n requestZoom: (level, c) => this.requestZoom(level, c, documentId),\n requestZoomBy: (d, c) => this.requestZoomBy(d, c, documentId),\n zoomIn: () => this.zoomIn(documentId),\n zoomOut: () => this.zoomOut(documentId),\n zoomToArea: (pageIndex, rect) => this.zoomToArea(pageIndex, rect, documentId),\n enableMarqueeZoom: () => this.enableMarqueeZoom(documentId),\n disableMarqueeZoom: () => this.disableMarqueeZoom(documentId),\n toggleMarqueeZoom: () => this.toggleMarqueeZoom(documentId),\n isMarqueeZoomActive: () => this.isMarqueeZoomActive(documentId),\n getState: () => this.getDocumentStateOrThrow(documentId),\n onZoomChange: (listener: Listener) =>\n this.zoom$.on((event) => {\n if (event.documentId === documentId) listener(event);\n }),\n onStateChange: (listener: Listener) =>\n this.state$.on((event) => {\n if (event.documentId === documentId) listener(event.state);\n }),\n };\n }\n\n // ─────────────────────────────────────────────────────────\n // State Helpers\n // ─────────────────────────────────────────────────────────\n\n private getDocumentState(documentId?: string): ZoomDocumentState | null {\n const id = documentId ?? this.getActiveDocumentId();\n return this.state.documents[id] ?? null;\n }\n\n private getDocumentStateOrThrow(documentId?: string): ZoomDocumentState {\n const state = this.getDocumentState(documentId);\n if (!state) {\n throw new Error(`Zoom state not found for document: ${documentId ?? 'active'}`);\n }\n return state;\n }\n\n // ─────────────────────────────────────────────────────────\n // Core Operations\n // ─────────────────────────────────────────────────────────\n\n private requestZoom(level: ZoomMode | number, center?: Point, documentId?: string): void {\n this.handleRequest({ level, center }, documentId);\n }\n\n private requestZoomBy(delta: number, center?: Point, documentId?: string): void {\n const id = documentId ?? this.getActiveDocumentId();\n const docState = this.getDocumentStateOrThrow(id);\n const cur = docState.currentZoomLevel;\n const target = this.toZoom(cur + delta);\n this.handleRequest({ level: target, center }, id);\n }\n\n private zoomIn(documentId?: string): void {\n const id = documentId ?? this.getActiveDocumentId();\n const docState = this.getDocumentStateOrThrow(id);\n const cur = docState.currentZoomLevel;\n this.handleRequest({ level: cur, delta: this.stepFor(cur) }, id);\n }\n\n private zoomOut(documentId?: string): void {\n const id = documentId ?? this.getActiveDocumentId();\n const docState = this.getDocumentStateOrThrow(id);\n const cur = docState.currentZoomLevel;\n this.handleRequest({ level: cur, delta: -this.stepFor(cur) }, id);\n }\n\n private zoomToArea(pageIndex: number, rect: Rect, documentId?: string): void {\n const id = documentId ?? this.getActiveDocumentId();\n this.handleZoomToArea(id, pageIndex, rect);\n }\n\n private enableMarqueeZoom(documentId?: string): void {\n const id = documentId ?? this.getActiveDocumentId();\n this.interactionManager?.forDocument(id).activate('marqueeZoom');\n }\n\n private disableMarqueeZoom(documentId?: string): void {\n const id = documentId ?? this.getActiveDocumentId();\n this.interactionManager?.forDocument(id).activateDefaultMode();\n }\n\n private toggleMarqueeZoom(documentId?: string): void {\n const id = documentId ?? this.getActiveDocumentId();\n const scope = this.interactionManager?.forDocument(id);\n if (scope?.getActiveMode() === 'marqueeZoom') {\n scope.activateDefaultMode();\n } else {\n scope?.activate('marqueeZoom');\n }\n }\n\n private isMarqueeZoomActive(documentId?: string): boolean {\n const id = documentId ?? this.getActiveDocumentId();\n return this.interactionManager?.forDocument(id).getActiveMode() === 'marqueeZoom';\n }\n\n // ─────────────────────────────────────────────────────────\n // Main Zoom Logic\n // ─────────────────────────────────────────────────────────\n\n private handleRequest(\n { level, delta = 0, center, focus = VerticalZoomFocus.Center, align = 'keep' }: ZoomRequest,\n documentId?: string,\n ) {\n const id = documentId ?? this.getActiveDocumentId();\n const docState = this.getDocumentStateOrThrow(id);\n const coreDoc = this.coreState.core.documents[id];\n if (!coreDoc) return;\n\n const viewport = this.viewport.forDocument(id);\n const metrics = viewport.getMetrics();\n const oldZoom = docState.currentZoomLevel;\n\n if (metrics.clientWidth === 0 || metrics.clientHeight === 0) {\n return;\n }\n\n // Step 1: Resolve target numeric zoom\n const base = typeof level === 'number' ? level : this.computeZoomForMode(id, level, metrics);\n\n if (base === false) return;\n\n const exactZoom = clamp(base + delta, this.minZoom, this.maxZoom);\n const newZoom = Math.floor(exactZoom * 1000) / 1000;\n\n // Step 2: Figure out viewport point to keep under focus\n const focusPoint: Point = center ?? {\n vx: metrics.clientWidth / 2,\n vy: focus === VerticalZoomFocus.Top ? 0 : metrics.clientHeight / 2,\n };\n\n // Step 3: Compute desired scroll offsets\n const { desiredScrollLeft, desiredScrollTop } = this.computeScrollForZoomChange(\n id,\n metrics,\n oldZoom,\n newZoom,\n focusPoint,\n align,\n );\n\n // Step 4: Dispatch and notify\n if (!isNaN(desiredScrollLeft) && !isNaN(desiredScrollTop)) {\n this.viewportPlugin.setViewportScrollMetrics(id, {\n scrollLeft: desiredScrollLeft,\n scrollTop: desiredScrollTop,\n });\n }\n\n this.dispatch(setZoomLevel(id, typeof level === 'number' ? newZoom : level, newZoom));\n this.dispatchCoreAction(setScale(newZoom, id));\n if (this.viewport.isGated(id)) {\n this.viewport.releaseGate('zoom', id);\n }\n\n viewport.scrollTo({\n x: desiredScrollLeft,\n y: desiredScrollTop,\n behavior: 'instant',\n });\n\n const evt: ZoomChangeEvent = {\n documentId: id,\n oldZoom,\n newZoom,\n level,\n center: focusPoint,\n desiredScrollLeft,\n desiredScrollTop,\n viewport: metrics,\n };\n\n this.zoom$.emit(evt);\n }\n\n private computeZoomForMode(\n documentId: string,\n mode: ZoomMode,\n vp: ViewportMetrics,\n ): number | false {\n const coreDoc = this.coreState.core.documents[documentId];\n if (!coreDoc) return false;\n\n const scrollScope = this.scroll.forDocument(documentId);\n const pgGap = scrollScope ? this.scroll.getPageGap() : 0;\n const vpGap = this.viewport.getViewportGap();\n\n const spreads = scrollScope.getSpreadPagesWithRotatedSize();\n if (!spreads.length) return false;\n\n if (vp.clientWidth === 0 || vp.clientHeight === 0) return false;\n\n const availableWidth = vp.clientWidth - 2 * vpGap;\n const availableHeight = vp.clientHeight - 2 * vpGap;\n\n if (availableWidth <= 0 || availableHeight <= 0) return false;\n\n let maxContentW = 0,\n maxContentH = 0;\n\n spreads.forEach((spread) => {\n const contentW = spread.reduce((s, p, i) => s + p.rotatedSize.width + (i ? pgGap : 0), 0);\n const contentH = Math.max(...spread.map((p) => p.rotatedSize.height));\n maxContentW = Math.max(maxContentW, contentW);\n maxContentH = Math.max(maxContentH, contentH);\n });\n\n switch (mode) {\n case ZoomMode.FitWidth:\n return availableWidth / maxContentW;\n case ZoomMode.FitPage:\n return Math.min(availableWidth / maxContentW, availableHeight / maxContentH);\n case ZoomMode.Automatic:\n return Math.min(availableWidth / maxContentW, 1);\n default:\n return 1;\n }\n }\n\n private computeScrollForZoomChange(\n documentId: string,\n vp: ViewportMetrics,\n oldZoom: number,\n newZoom: number,\n focus: Point,\n align: 'keep' | 'center' = 'keep',\n ) {\n const scrollScope = this.scroll.forDocument(documentId);\n const layout = scrollScope.getLayout();\n const vpGap = this.viewport.getViewportGap();\n\n const contentW = layout.totalContentSize.width;\n const contentH = layout.totalContentSize.height;\n\n const availableWidth = vp.clientWidth - 2 * vpGap;\n const availableHeight = vp.clientHeight - 2 * vpGap;\n\n const off = (availableSpace: number, cw: number, zoom: number) =>\n cw * zoom < availableSpace ? (availableSpace - cw * zoom) / 2 : 0;\n\n const offXold = off(availableWidth, contentW, oldZoom);\n const offYold = off(availableHeight, contentH, oldZoom);\n\n const offXnew = off(availableWidth, contentW, newZoom);\n const offYnew = off(availableHeight, contentH, newZoom);\n\n const cx = (vp.scrollLeft + focus.vx - vpGap - offXold) / oldZoom;\n const cy = (vp.scrollTop + focus.vy - vpGap - offYold) / oldZoom;\n\n const baseLeft = cx * newZoom + vpGap + offXnew;\n const baseTop = cy * newZoom + vpGap + offYnew;\n\n const desiredScrollLeft =\n align === 'center' ? baseLeft - vp.clientWidth / 2 : baseLeft - focus.vx;\n const desiredScrollTop =\n align === 'center' ? baseTop - vp.clientHeight / 2 : baseTop - focus.vy;\n\n return {\n desiredScrollLeft: Math.max(0, desiredScrollLeft),\n desiredScrollTop: Math.max(0, desiredScrollTop),\n };\n }\n\n private handleZoomToArea(documentId: string, pageIndex: number, rect: Rect) {\n const coreDoc = this.coreState.core.documents[documentId];\n if (!coreDoc) return;\n\n const rotation = coreDoc.rotation;\n const viewport = this.viewport.forDocument(documentId);\n const vp = viewport.getMetrics();\n const vpGap = this.viewport.getViewportGap();\n const docState = this.getDocumentStateOrThrow(documentId);\n const oldZ = docState.currentZoomLevel;\n\n const availableW = vp.clientWidth - 2 * vpGap;\n const availableH = vp.clientHeight - 2 * vpGap;\n\n const scrollScope = this.scroll.forDocument(documentId);\n const layout = scrollScope.getLayout();\n\n const vItem = layout.virtualItems.find((it) =>\n it.pageLayouts.some((p) => p.pageIndex === pageIndex),\n );\n if (!vItem) return;\n\n const pageRel = vItem.pageLayouts.find((p) => p.pageIndex === pageIndex)!;\n\n const rotatedRect = rotateRect(\n { width: pageRel.width, height: pageRel.height },\n rect,\n rotation,\n );\n\n const targetZoom = this.toZoom(\n Math.min(availableW / rotatedRect.size.width, availableH / rotatedRect.size.height),\n );\n\n const pageAbsX = vItem.x + pageRel.x;\n const pageAbsY = vItem.y + pageRel.y;\n\n const cxContent = pageAbsX + rotatedRect.origin.x + rotatedRect.size.width / 2;\n const cyContent = pageAbsY + rotatedRect.origin.y + rotatedRect.size.height / 2;\n\n const off = (avail: number, cw: number, z: number) =>\n cw * z < avail ? (avail - cw * z) / 2 : 0;\n\n const offXold = off(availableW, layout.totalContentSize.width, oldZ);\n const offYold = off(availableH, layout.totalContentSize.height, oldZ);\n\n const centerVX = vpGap + offXold + cxContent * oldZ - vp.scrollLeft;\n const centerVY = vpGap + offYold + cyContent * oldZ - vp.scrollTop;\n\n this.handleRequest(\n {\n level: targetZoom,\n center: { vx: centerVX, vy: centerVY },\n align: 'center',\n },\n documentId,\n );\n }\n\n private recalcAuto(documentId: string, focus?: VerticalZoomFocus) {\n const docState = this.getDocumentState(documentId);\n if (!docState) return;\n\n if (\n docState.zoomLevel === ZoomMode.Automatic ||\n docState.zoomLevel === ZoomMode.FitPage ||\n docState.zoomLevel === ZoomMode.FitWidth\n ) {\n this.handleRequest({ level: docState.zoomLevel, focus }, documentId);\n }\n }\n\n // ─────────────────────────────────────────────────────────\n // Helpers\n // ─────────────────────────────────────────────────────────\n\n private normalizeRanges(ranges: ZoomRangeStep[]): ZoomRangeStep[] {\n return [...ranges].filter((r) => r.step > 0 && r.max > r.min).sort((a, b) => a.min - b.min);\n }\n\n private stepFor(zoom: number): number {\n const r = this.zoomRanges.find((r) => zoom >= r.min && zoom < r.max);\n return r ? r.step : this.zoomStep;\n }\n\n private toZoom(v: number) {\n return parseFloat(clamp(v, this.minZoom, this.maxZoom).toFixed(2));\n }\n\n // ─────────────────────────────────────────────────────────\n // Marquee Zoom\n // ─────────────────────────────────────────────────────────\n\n public registerMarqueeOnPage(opts: RegisterMarqueeOnPageOptions) {\n if (!this.interactionManager) {\n this.logger.warn(\n 'ZoomPlugin',\n 'MissingDependency',\n 'Interaction manager plugin not loaded, marquee zoom disabled',\n );\n return () => {};\n }\n\n const coreDoc = this.coreState.core.documents[opts.documentId];\n if (!coreDoc || !coreDoc.document) {\n this.logger.warn('ZoomPlugin', 'DocumentNotFound', 'Document not found');\n return () => {};\n }\n\n const page = coreDoc.document.pages[opts.pageIndex];\n if (!page) {\n this.logger.warn('ZoomPlugin', 'PageNotFound', `Page ${opts.pageIndex} not found`);\n return () => {};\n }\n\n const handlers = createMarqueeHandler({\n pageSize: page.size,\n scale: opts.scale,\n onPreview: opts.callback.onPreview,\n onCommit: (rect) => {\n this.zoomToArea(opts.pageIndex, rect, opts.documentId);\n opts.callback.onCommit?.(rect);\n },\n onSmallDrag: () => {\n this.zoomIn(opts.documentId);\n opts.callback.onSmallDrag?.();\n },\n });\n\n const off = this.interactionManager.registerHandlers({\n documentId: opts.documentId,\n modeId: 'marqueeZoom',\n handlers,\n pageIndex: opts.pageIndex,\n });\n\n return off;\n }\n\n // ─────────────────────────────────────────────────────────\n // Store Update Handlers\n // ─────────────────────────────────────────────────────────\n\n override onStoreUpdated(prevState: ZoomState, newState: ZoomState): void {\n // Emit state changes for each changed document\n for (const documentId in newState.documents) {\n const prevDoc = prevState.documents[documentId];\n const newDoc = newState.documents[documentId];\n\n if (\n prevDoc &&\n newDoc &&\n (prevDoc.currentZoomLevel !== newDoc.currentZoomLevel ||\n prevDoc.zoomLevel !== newDoc.zoomLevel ||\n prevDoc.isMarqueeZoomActive !== newDoc.isMarqueeZoomActive)\n ) {\n this.state$.emit({\n documentId,\n state: newDoc,\n });\n }\n }\n }\n\n // ─────────────────────────────────────────────────────────\n // Lifecycle\n // ─────────────────────────────────────────────────────────\n\n async initialize(): Promise {\n this.logger.info('ZoomPlugin', 'Initialize', 'Zoom plugin initialized');\n }\n\n async destroy() {\n this.zoom$.clear();\n this.state$.clear();\n super.destroy();\n }\n}\n","import { Position, Rect, Size } from '@embedpdf/models';\nimport { clamp } from '@embedpdf/core';\nimport {\n EmbedPdfPointerEvent,\n PointerEventHandlersWithLifecycle,\n} from '@embedpdf/plugin-interaction-manager';\n\nexport function createMarqueeHandler(opts: {\n pageSize: Size;\n scale: number;\n minDragPx?: number;\n onPreview?: (rect: Rect | null) => void;\n onCommit?: (rect: Rect) => void;\n onSmallDrag?: () => void;\n}): PointerEventHandlersWithLifecycle {\n const { pageSize, scale, minDragPx = 5, onPreview, onCommit, onSmallDrag } = opts;\n\n let start: Position | null = null;\n let last: Rect | null = null;\n\n return {\n onPointerDown: (pos, evt) => {\n start = pos;\n last = { origin: { x: pos.x, y: pos.y }, size: { width: 0, height: 0 } };\n onPreview?.(last);\n evt.setPointerCapture?.();\n },\n onPointerMove: (pos) => {\n if (!start) return;\n const x = clamp(pos.x, 0, pageSize.width);\n const y = clamp(pos.y, 0, pageSize.height);\n last = {\n origin: { x: Math.min(start.x, x), y: Math.min(start.y, y) },\n size: { width: Math.abs(x - start.x), height: Math.abs(y - start.y) },\n };\n onPreview?.(last);\n },\n onPointerUp: (_pos, evt) => {\n if (last) {\n const dragPx = Math.max(last.size.width, last.size.height) * scale;\n if (dragPx > minDragPx) {\n onCommit?.(last); // Large drag → zoom to area\n } else {\n onSmallDrag?.(); // Small drag → zoom in\n }\n }\n start = null;\n last = null;\n onPreview?.(null);\n evt.releasePointerCapture?.();\n },\n onPointerCancel: (_pos, evt) => {\n start = null;\n last = null;\n onPreview?.(null);\n evt.releasePointerCapture?.();\n },\n };\n}\n","import { PluginPackage } from '@embedpdf/core';\n\nimport { ZoomAction } from './actions';\nimport { manifest, ZOOM_PLUGIN_ID } from './manifest';\nimport { zoomReducer, initialState, initialDocumentState } from './reducer';\nimport { ZoomPluginConfig, ZoomState } from './types';\nimport { ZoomPlugin } from './zoom-plugin';\n\nexport const ZoomPluginPackage: PluginPackage =\n {\n manifest,\n create: (registry, config) => new ZoomPlugin(ZOOM_PLUGIN_ID, registry, config),\n reducer: zoomReducer,\n initialState,\n };\n\nexport * from 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