feat: Add shared FolkJS utilities (maximize, pinned-view, toJSON)
- maximize.ts: maximizeShape(), restoreShape(), toggleMaximize() - pinned-view.ts: PinnedViewManager class for viewport-fixed shapes - folk-shape.ts: Base toJSON() method for Automerge sync - Updated exports in lib/index.ts Completes task-8: Port shared hooks as FolkJS utilities 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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@ -1,9 +1,10 @@
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---
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id: task-8
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title: Port shared hooks as FolkJS utilities
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status: To Do
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status: Done
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assignee: []
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created_date: '2026-01-02 16:10'
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updated_date: '2026-01-02 18:45'
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labels:
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- foundation
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- utilities
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@ -36,7 +37,30 @@ These utilities enable the StandardizedToolWrapper features (maximize, pin, clos
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## Acceptance Criteria
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<!-- AC:BEGIN -->
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- [ ] #1 maximizeShape utility working
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- [ ] #2 PinnedViewManager class working
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- [ ] #3 All shapes have consistent toJSON/fromJSON
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- [x] #1 maximizeShape utility working
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- [x] #2 PinnedViewManager class working
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- [x] #3 All shapes have consistent toJSON/fromJSON
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<!-- AC:END -->
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## Notes
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### Implementation Complete
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Created three utility implementations:
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1. **maximize.ts** - `maximizeShape()`, `restoreShape()`, `toggleMaximize()`, `isMaximized()`
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- Uses WeakMap to store original dimensions
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- Animates with 0.3s CSS transitions
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- Accounts for canvas transforms
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2. **pinned-view.ts** - `PinnedViewManager` class
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- 9 preset positions + 'current' for in-place pinning
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- RequestAnimationFrame for zero-lag viewport tracking
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- Compensates for canvas pan/zoom transforms
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- Singleton pattern via `getPinnedViewManager()`
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3. **folk-shape.ts** - Base `toJSON()` method
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- Returns type, id, x, y, width, height, rotation
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- Subclasses override and extend
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All utilities exported from `lib/index.ts`.
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@ -126,8 +126,8 @@ export class FolkMyShape extends FolkShape {
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| React Hook | FolkJS Equivalent | Status |
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|------------|-------------------|--------|
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| useMaximize | maximizeShape() utility | To Do |
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| usePinnedToView | PinnedViewManager class | To Do |
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| useMaximize | maximizeShape() utility | ✅ Done |
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| usePinnedToView | PinnedViewManager class | ✅ Done |
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| useCalendarEvents | CalendarService class | To Do |
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| useWhisperTranscription | WhisperService class | To Do |
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| useLiveImage | LiveImageService class | To Do |
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@ -545,4 +545,20 @@ export class FolkShape extends FolkElement {
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this.requestUpdate();
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}
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/**
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* Serialize shape to JSON for Automerge sync
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* Subclasses should override and call super.toJSON()
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*/
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toJSON(): Record<string, unknown> {
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return {
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type: "folk-shape",
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id: this.id,
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x: this.x,
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y: this.y,
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width: this.width,
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height: this.height,
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rotation: this.rotation,
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};
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}
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}
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@ -17,6 +17,8 @@ export * from "./resize-manager";
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export * from "./cursors";
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export * from "./utils";
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export * from "./tags";
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export * from "./maximize";
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export * from "./pinned-view";
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// Components
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export * from "./folk-shape";
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@ -0,0 +1,147 @@
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import type { FolkShape } from "./folk-shape";
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interface StoredDimensions {
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x: number;
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y: number;
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width: number;
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height: number;
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rotation: number;
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}
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// Store original dimensions for each maximized shape
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const originalDimensions = new WeakMap<FolkShape, StoredDimensions>();
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/**
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* Check if a shape is currently maximized
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*/
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export function isMaximized(shape: FolkShape): boolean {
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return originalDimensions.has(shape);
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}
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/**
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* Maximize a shape to fill the viewport
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* @param shape - The shape to maximize
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* @param padding - Padding from viewport edges (default 40px)
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* @param animate - Whether to animate the transition (default true)
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*/
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export function maximizeShape(
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shape: FolkShape,
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padding = 40,
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animate = true
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): void {
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if (isMaximized(shape)) {
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// Already maximized, restore instead
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restoreShape(shape, animate);
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return;
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}
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// Store original dimensions
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originalDimensions.set(shape, {
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x: shape.x,
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y: shape.y,
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width: shape.width,
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height: shape.height,
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rotation: shape.rotation,
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});
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// Calculate viewport dimensions
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const viewportWidth = window.innerWidth - padding * 2;
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const viewportHeight = window.innerHeight - padding * 2;
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// Get canvas element to account for any transforms
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const canvas = shape.closest("#canvas") as HTMLElement | null;
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const canvasRect = canvas?.getBoundingClientRect();
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const scrollX = window.scrollX || 0;
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const scrollY = window.scrollY || 0;
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// Calculate centered position
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const newX = padding + scrollX - (canvasRect?.left || 0);
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const newY = padding + scrollY - (canvasRect?.top || 0);
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if (animate) {
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shape.style.transition = "all 0.3s ease-out";
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}
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// Apply maximized dimensions
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shape.x = newX;
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shape.y = newY;
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shape.width = viewportWidth;
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shape.height = viewportHeight;
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shape.rotation = 0;
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// Add maximized state
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shape.setAttribute("data-maximized", "true");
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// Remove transition after animation
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if (animate) {
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setTimeout(() => {
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shape.style.transition = "";
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}, 300);
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}
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// Dispatch event
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shape.dispatchEvent(
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new CustomEvent("maximize", {
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detail: { maximized: true },
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bubbles: true,
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})
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);
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}
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/**
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* Restore a maximized shape to its original dimensions
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* @param shape - The shape to restore
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* @param animate - Whether to animate the transition (default true)
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*/
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export function restoreShape(shape: FolkShape, animate = true): void {
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const original = originalDimensions.get(shape);
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if (!original) return;
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if (animate) {
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shape.style.transition = "all 0.3s ease-out";
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}
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// Restore original dimensions
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shape.x = original.x;
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shape.y = original.y;
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shape.width = original.width;
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shape.height = original.height;
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shape.rotation = original.rotation;
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// Remove maximized state
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shape.removeAttribute("data-maximized");
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originalDimensions.delete(shape);
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// Remove transition after animation
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if (animate) {
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setTimeout(() => {
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shape.style.transition = "";
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}, 300);
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}
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// Dispatch event
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shape.dispatchEvent(
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new CustomEvent("maximize", {
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detail: { maximized: false },
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bubbles: true,
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})
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);
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}
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/**
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* Toggle maximize state of a shape
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* @param shape - The shape to toggle
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* @param padding - Padding from viewport edges (default 40px)
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* @param animate - Whether to animate the transition (default true)
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*/
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export function toggleMaximize(
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shape: FolkShape,
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padding = 40,
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animate = true
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): void {
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if (isMaximized(shape)) {
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restoreShape(shape, animate);
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} else {
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maximizeShape(shape, padding, animate);
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}
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}
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@ -0,0 +1,275 @@
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import type { FolkShape } from "./folk-shape";
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export type PinPosition =
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| "current"
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| "top-left"
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| "top-center"
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| "top-right"
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| "center-left"
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| "center"
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| "center-right"
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| "bottom-left"
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| "bottom-center"
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| "bottom-right";
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interface PinnedShapeState {
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shape: FolkShape;
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position: PinPosition;
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offset: { x: number; y: number };
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originalX: number;
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originalY: number;
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}
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/**
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* PinnedViewManager - Keeps shapes fixed to viewport positions as the canvas moves/zooms
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*
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* Usage:
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* const manager = new PinnedViewManager(canvasElement);
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* manager.pin(shape, 'top-right');
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* manager.unpin(shape);
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*/
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export class PinnedViewManager {
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#canvas: HTMLElement;
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#pinnedShapes = new Map<FolkShape, PinnedShapeState>();
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#rafId: number | null = null;
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#lastCanvasTransform = { x: 0, y: 0, scale: 1 };
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constructor(canvas: HTMLElement) {
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this.#canvas = canvas;
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this.#startTracking();
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}
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/**
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* Pin a shape to a viewport position
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* @param shape - The shape to pin
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* @param position - Where to pin it (default: 'current' keeps current screen position)
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*/
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pin(shape: FolkShape, position: PinPosition = "current"): void {
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if (this.#pinnedShapes.has(shape)) {
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// Update position if already pinned
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const state = this.#pinnedShapes.get(shape)!;
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state.position = position;
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this.#updateOffset(state);
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return;
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}
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const state: PinnedShapeState = {
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shape,
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position,
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offset: { x: 0, y: 0 },
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originalX: shape.x,
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originalY: shape.y,
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};
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this.#updateOffset(state);
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this.#pinnedShapes.set(shape, state);
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// Add pinned attribute for styling
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shape.setAttribute("data-pinned", position);
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// Dispatch event
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shape.dispatchEvent(
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new CustomEvent("pin", {
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detail: { pinned: true, position },
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bubbles: true,
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})
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);
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}
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/**
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* Unpin a shape, returning it to normal canvas behavior
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*/
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unpin(shape: FolkShape): void {
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const state = this.#pinnedShapes.get(shape);
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if (!state) return;
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this.#pinnedShapes.delete(shape);
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shape.removeAttribute("data-pinned");
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// Dispatch event
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shape.dispatchEvent(
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new CustomEvent("pin", {
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detail: { pinned: false },
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bubbles: true,
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})
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);
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}
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/**
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* Check if a shape is pinned
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*/
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isPinned(shape: FolkShape): boolean {
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return this.#pinnedShapes.has(shape);
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}
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/**
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* Get the pin position of a shape
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*/
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getPinPosition(shape: FolkShape): PinPosition | null {
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return this.#pinnedShapes.get(shape)?.position || null;
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}
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/**
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* Toggle pin state of a shape
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*/
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togglePin(shape: FolkShape, position: PinPosition = "current"): void {
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if (this.isPinned(shape)) {
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this.unpin(shape);
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} else {
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this.pin(shape, position);
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}
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}
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/**
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* Clean up - call when destroying the canvas
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*/
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destroy(): void {
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if (this.#rafId !== null) {
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cancelAnimationFrame(this.#rafId);
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}
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this.#pinnedShapes.clear();
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}
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#updateOffset(state: PinnedShapeState): void {
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const { shape, position } = state;
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const viewport = this.#getViewport();
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const padding = 20;
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switch (position) {
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case "current":
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// Keep current screen position
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state.offset = { x: shape.x, y: shape.y };
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break;
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case "top-left":
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state.offset = { x: padding, y: padding };
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break;
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case "top-center":
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state.offset = {
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x: viewport.width / 2 - shape.width / 2,
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y: padding,
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};
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break;
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case "top-right":
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state.offset = {
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x: viewport.width - shape.width - padding,
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y: padding,
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};
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break;
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case "center-left":
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state.offset = {
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x: padding,
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y: viewport.height / 2 - shape.height / 2,
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};
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break;
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case "center":
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state.offset = {
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x: viewport.width / 2 - shape.width / 2,
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y: viewport.height / 2 - shape.height / 2,
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};
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break;
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case "center-right":
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state.offset = {
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x: viewport.width - shape.width - padding,
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y: viewport.height / 2 - shape.height / 2,
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};
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break;
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case "bottom-left":
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state.offset = {
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x: padding,
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y: viewport.height - shape.height - padding,
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};
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break;
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case "bottom-center":
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state.offset = {
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x: viewport.width / 2 - shape.width / 2,
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y: viewport.height - shape.height - padding,
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};
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break;
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case "bottom-right":
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state.offset = {
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x: viewport.width - shape.width - padding,
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y: viewport.height - shape.height - padding,
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};
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break;
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}
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}
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#getViewport(): { width: number; height: number } {
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return {
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width: window.innerWidth,
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height: window.innerHeight,
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};
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}
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#getCanvasTransform(): { x: number; y: number; scale: number } {
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const transform = this.#canvas.style.transform;
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if (!transform) {
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return { x: 0, y: 0, scale: 1 };
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}
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// Parse scale
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const scaleMatch = transform.match(/scale\(([^)]+)\)/);
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const scale = scaleMatch ? parseFloat(scaleMatch[1]) : 1;
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// Parse translate
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const translateMatch = transform.match(
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/translate\(([^,]+),\s*([^)]+)\)/
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);
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const x = translateMatch ? parseFloat(translateMatch[1]) : 0;
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const y = translateMatch ? parseFloat(translateMatch[2]) : 0;
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return { x, y, scale };
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}
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#startTracking(): void {
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const update = () => {
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const currentTransform = this.#getCanvasTransform();
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// Only update if transform changed
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if (
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currentTransform.x !== this.#lastCanvasTransform.x ||
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currentTransform.y !== this.#lastCanvasTransform.y ||
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currentTransform.scale !== this.#lastCanvasTransform.scale
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) {
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this.#lastCanvasTransform = currentTransform;
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this.#updatePinnedShapes();
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}
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this.#rafId = requestAnimationFrame(update);
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};
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this.#rafId = requestAnimationFrame(update);
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}
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#updatePinnedShapes(): void {
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const { x: canvasX, y: canvasY, scale } = this.#lastCanvasTransform;
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for (const [, state] of this.#pinnedShapes) {
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const { shape, offset, position } = state;
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if (position === "current") {
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// For 'current' position, compensate for canvas movement
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shape.x = (offset.x - canvasX) / scale;
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shape.y = (offset.y - canvasY) / scale;
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} else {
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// For fixed positions, recalculate offset and apply
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this.#updateOffset(state);
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shape.x = (offset.x - canvasX) / scale;
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shape.y = (offset.y - canvasY) / scale;
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}
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}
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}
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}
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// Singleton instance for convenience
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let defaultManager: PinnedViewManager | null = null;
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/**
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* Get or create a PinnedViewManager for the given canvas
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*/
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export function getPinnedViewManager(canvas: HTMLElement): PinnedViewManager {
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if (!defaultManager) {
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defaultManager = new PinnedViewManager(canvas);
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}
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return defaultManager;
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}
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