Core ガイド

import { createSliderController } from '@reelkit/core';

const controller = createSliderController(
  {
    count: 10,
    direction: 'vertical',
    enableWheel: true,
    transitionDuration: 300,
  },
  {
    onAfterChange: (index) => console.log('Changed to:', index),
  }
);

// Attach to DOM element
controller.attach(element);
controller.observe();

// Go to specific index
controller.goTo(5);           // instant
controller.goTo(5, true);     // animated, returns Promise

// Navigate to next/previous
controller.next();
controller.prev();

// Connect to DOM element
controller.attach(element);

// Start gesture, keyboard, and wheel observation
controller.observe();

// Stop gesture, keyboard, and wheel observation
controller.unobserve();

// Detach DOM listeners (reversible — use for React effect cleanup)
controller.detach();

// Permanent teardown (use for Angular onDestroy)
controller.dispose();

// Recalculate positions
controller.adjust();

// Update size
controller.setPrimarySize(600);

// Update configuration
controller.updateConfig({
  count: 20,
  loop: true,
});

import { defaultRangeExtractor } from '@reelkit/core';

// Default: renders current ± 1 (3 DOM nodes)
const indexes = defaultRangeExtractor(currentIndex, count);

// Custom: skip hidden slides by shifting to next valid index
const hiddenSlides = new Set([2, 5]);

const skipHiddenExtractor = (current: number, count: number) => {
  const result: number[] = [];
  // Collect prev, current, next — skip hidden, shift forward
  for (let i = current - 1, added = 0; added < 3 && i < count; i++) {
    if (i >= 0 && !hiddenSlides.has(i)) {
      result.push(i);
      added++;
    }
  }
  return result;
};

import { createSignal, createComputed, reaction } from '@reelkit/core';

// Create a signal
const count = createSignal(0);

// Observe changes (returns a disposer function)
const dispose = count.observe(() => console.log(count.value));

// Update value
count.value = 5;

// Create computed signal (requires a deps factory)
const doubled = createComputed(() => count.value * 2, () => [count]);

// Run side effects on signal changes
const disposeReaction = reaction(
  () => [count],
  () => console.log('Count changed:', count.value)
);

// Cleanup
dispose();
disposeReaction();

const { index, axisValue, indexes } = controller.state;

// Observe index changes (returns a disposer function)
const disposeIndex = index.observe(() => {
  console.log('Current index:', index.value);
});

// Observe visible indexes for virtualization
const disposeIndexes = indexes.observe(() => {
  console.log('Visible:', indexes.value);
});

// Cleanup when done
disposeIndex();
disposeIndexes();

import { createTimelineController } from '@reelkit/core';

const timeline = createTimelineController({
  onScrubStart: () => video.pause(),
  onScrubEnd: () => video.play(),
});

timeline.attach(video);
const dispose = timeline.bindInteractions(trackEl);

// Render: read signals and update DOM
timeline.progress.observe(() => {
  fillEl.style.width = `${timeline.progress.value * 100}%`;
});

// Cleanup
dispose();
timeline.detach();

import { createUrlStateController, urlIndexKey } from '@reelkit/core';

const controller = createUrlStateController({
  param: 'photo',
  ...urlIndexKey(() => items.length),
});

const detach = controller.attach(); // begin mirroring the URL
controller.position.observe(() => {
  // null → closed; a number → open at that slide
  render(controller.position.value);
});

// Write back: opening pushes once, navigating replaces, closing clears
controller.set(3);
controller.set(null);

import {
  createUrlStateController,
  createViewedStateController,
  urlStableIdTwoAxisKey,
  twoAxisViewedTracking,
} from '@reelkit/core';

const key = urlStableIdTwoAxisKey({ outerItems, innerItems });

const url = createUrlStateController({ param: 'story', ...key });
const seen = createViewedStateController({
  storageKey: 'stories-seen',
  ...key,
  ...twoAxisViewedTracking,
});

seen.attach();                       // reads storage, follows other tabs
seen.record({ outer: 2, inner: 1 }); // furthest point wins, a rewatch never rewinds
seen.resolve('user_42');             // → { outer: 2, inner: 1 } | null

import { createTimerController, reaction } from '@reelkit/core';

const timer = createTimerController({
  duration: 5000,
  onComplete: () => console.log('Timer finished!'),
});

// Observe progress (0 to 1)
const dispose = reaction(
  () => [timer.progress],
  () => {
    console.log('Progress:', timer.progress.value);
  },
);

// Start with default duration
timer.start();

// Or override duration for a specific story
timer.start(8000);

// Pause/resume preserves exact position
timer.pause();
timer.resume();

// Reset to 0
timer.reset();

// Cleanup
dispose();
timer.dispose();

import { createSlideshowController, createSliderController } from '@reelkit/core';

const items = [{ type: 'image' }, { type: 'video' }, { type: 'image' }];

const slider = createSliderController(
  { count: items.length, direction: 'horizontal' },
  { onAfterChange: (index) => onSlideChange(index) },
);

const slideshow = createSlideshowController({
  interval: 5000,
  onAdvance: () => {
    if (slider.state.index.value >= items.length - 1) slideshow.pause();
    else slider.next();
  },
});

// Every slide change starts over and waits for the new slide.
function onSlideChange(index: number) {
  slideshow.setSlide(items[index].type === 'video' ? 'video' : 'image');
}

// From the slide: an image counts its interval once it loaded or failed,
// a video advances when it ends (let it play once rather than loop).
const onImageSettled = () => slideshow.ready();
const onVideoEnded = () => slideshow.ended();

// Holds stack: the slideshow runs again once every reason is released.
const onControlsEnter = () => slideshow.hold('hover');
const onControlsLeave = () => slideshow.release('hover');

onSlideChange(0);
slideshow.play();

// Later
slideshow.dispose();