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Open-Source PDF SDK & AI Document Processing

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Helpers, Hooks & Constants ​

This guide covers the utility modules (helpers/), Vue composables (hooks/), and registries (constants/) that support the UI layer.

Helpers — src/helpers/ ​

FilePurpose
device.jsDevice/browser detection (detailed below).
hotkeysManager.jsMinimal keyboard-shortcut manager: register(combo, handler), unregister(combo), initialize(), destroy(). Not yet wired into the app.
loadDocument.jsConvenience wrapper around core.loadDocument(src, options, docNum) that wires the engine's progress callback to useDocument.setLoadingProgress. Usable helper (the live loading path in DocumentContainer.vue calls core.loadDocument directly).
initDocument.jsLive bootstrap: new ComPDFKitViewer(options) from lib/webview.min.js, then core.setDocumentViewer(1, documentViewer).
setupI18n.jsi18next initialization reference (declares Languages[] catalog + languageRules).
getHashParameters.jsParses window.location.hash into a key/value object (typed boolean coercion).
getPopupPosition.jsComputes screen coordinates for annotation popups.
loadScript.jsloadScript(src, warning) — Promise wrapper injecting <script> into <head>. Also exports loadConfig(initOptions) (the iframe↔parent config handshake).
renderStampPreview.jsFloating .stamp-preview div that follows the mouse showing a stamp image.
utils.jsuploadFile(extension), hslToRgb, convertColor, areColorsSimilar(c1, c2, threshold=10).
annotationPermissions.jscanCopyAnnotations({ isReadOnly, isUserAdmin, currentAuthor, annotations }).

device.js ​

Exports booleans/functions computed once at module load from navigator.userAgent and window.innerWidth:

  • Layout breakpoints: isDesktop() (> 900), isTabletOrMobile() (<= 900), isMobile / isMobileSize() (< 640).
  • OS: isMac, isWindows, isIOS (incl. iOS 13 MacIntel+touch), isAndroid, isHarmonyOSMobile, isiPad.
  • Mobile aggregate: isMobileDevice (iOS || Android || HarmonyOS || webOS/BlackBerry/IEMobile/Opera Mini) and isMobileDeviceFunc().
  • Browsers: isChrome, isSafari, isChromeOniOS, isFirefoxOniOS, isFirefox, isIEEdge, isIEEdgeChromium, isIE11, isIE, isIEEdgeLegacy.

device.js is pulled in by ~27 components/stores; isMobileDevice / isiPad drive the mobile guards in setActiveToolMode / setToolbarGroup.

getPopupPosition.js ​

getAnnotationPopupPositionBasedOn(rect, pageNumber, popup, documentViewerKey=1, position='right') → { left, top }. Pipeline: convert page-space rect corners to window coords via core.pageToWindow; read popup.getBoundingClientRect(); clamp left (center or right-aligned, BOUNDARY_PADDING=4) and top (prefer below the annotation at annotBottom + ANNOTATION_PADDING, fall back to above, then to the side with more space).

Hooks — src/hooks/ ​

FileStatusPurpose
useSearch.jsFunctional, self-containedReturns reactive search state (searchQuery, searchResults, currentIndex, searching, currentResult) plus search(), setActiveResult(), clear() methods that delegate to core.search / core.setActiveSearchResult / core.clearSearchResults. Does not touch the global document store, so it does not conflict with the store-driven search panel.
useOnAnnotationPopupOpen.jsFunctional, no consumersReturns a { selectedAnnotation } ref; registers annotationSelected / annotationDeselected and removes them via onScopeDispose, so listeners are cleaned up when the owning scope disposes.

Both hooks are currently orphaned (no consumers found by grep). They are safe to use as-is; alternatively prefer the store-based approach for search.

Constants — src/constants/ ​

dataElements.js ​

A centralized UPPER_SNAKE_CASE → camelCase/kebab-case map of every dataElement identifier — the single source of truth for the store's activeElements / disabledElements / activeElementsTab / headers keys. Sections: toolbar/header buttons, annotation tools, popup actions, crop popup, redaction, form tools, measurement tools, content editor, compare, document actions, panels, dialogs, disable-only chrome, and tab constants (ThumbnailsButton, OutlinesButton, AnnotationButton, LayersButton, SignatureButton, SearchButton, General, Appearance, Preference, Standard, Dynamic, Custom, Keyboard, Trackpad, …).

toolNames.js ​

Three exports:

  • ToolNames — UPPER_SNAKE → camelCase map of every tool name (View, Annotation, Form, Measurement, Content editor, Signature, Security).
  • DataElementToToolName — reverse map from DataElements.*_BUTTON to ToolNames.*.
  • map — { [toolName]: { tool, toolName? } } lookup used by document.js#setToolState.
  • register(tool) — adds a custom tool to map.

panel.js ​

  • panelNames — { pageModePanel, stampPanel } (lazy-rendered panels).
  • noLazyPanelNames — { stylePanel, leftPanel, rightPanel, linkPanel, colorSeparationPanel, contentEditorPanel, redactionPanel } (eager-rendered panels).

API helpers — src/api_helpers/ ​

FilePurpose
createEncapsulatedStore.jsWraps a Pinia store to expose only dispatch(action)(args) and getState(key) (deep-cloned). Used by popup APIs, getPassword, getPanels.
createPopupAPI.jsBuilds the UI.Popup interface (add / update / getItems) for a given popup data-element.