Clover IIIF

A flexible IIIF Manifest viewer for Image, Audio, and Video canvases built with React.js

Demo | Code

Clover IIIF is a UI component that renders a multicanvas IIIF item viewer for Video and Sound content resources with pan-zoom support for Image via OpenSeadragon. Provide a IIIF Presentation manifest and the component:

• Renders a multi-canvas Video, Sound, and Image viewer
• Renders thumbnails as navigation between canvases
• Renders annotations with the motivation of supplementing with a content resource having the format of text/vtt for Video and Sound
• Video and Sound are rendered within a HTML5 <video> element
• Image canvases are renderered with OpenSeadragon
• Supports HLS streaming for .m3u8 extensions
• Supports IIIF Collections and toggling between child Manifests
• Supports placeholderCanvas for Image canvases.

Example showing Clover IIIF rendering Video with a supplementing VTT cues for navigation.

---

Documentation

• Installation
• Basic Usage
• Active Canvas
• Configuring Captions
• Custom Theme
• Reference
• Manifest Requirements
• Development

---

Installation

Install the component from your command line using npm install,

npm install @samvera/clover-iiif

OR if you prefer Yarn, use yarn add.

yarn add @samvera/clover-iiif

---

Basic Usage

Add the CloverIIIF component to your jsx or tsx code.

import CloverIIIF from "@samvera/clover-iiif";

Minimal usage providing the <CloverIIIF/> component with an external manifest.

const id =
  "https://raw.githubusercontent.com/samvera-labs/clover-iiif/main/public/fixtures/iiif/manifests/sample.json";

return <CloverIIIF id={id} />;

See Example

Usage with Next.js

Usage with Next.js requires a dynamic import using next/dynamic due to a dependency of OpenSeadragon.

import dynamic from "next/dynamic";

const CloverIIIF = dynamic(() => import("@samvera/clover-iiif"), {
  ssr: false,
});

const id = "https://digital.lib.utk.edu/assemble/manifest/heilman/1187";

return <CloverIIIF id={id} />;

---

Active Canvas

Example on using canvasIdCallback to return to your consuming application the active canvas ID. This will return as a string.

const id =
  "https://raw.githubusercontent.com/samvera-labs/clover-iiif/main/public/fixtures/iiif/manifests/sample.json";

const handlCanvasIdCallback = (activeCanvasId) => {
  if (activeCanvasId) console.log(activeCanvasId);
};

return <CloverIIIF id={id} canvasIdCallback={handlCanvasIdCallback} />;

See Example

---

Configuring Captions

WebVTT content resources are the source for both content mapped closed captioning <track/> elements in the HTML 5 video player and to the navigator panel adjacent to it. You may ignore these resources as tracks if they are not intended for closed captioning or subtitling by string values matching the label of the content resource. This is a manual option within the viewer as there is no defined way for a manifest to prescribe motivation for these resources beyond supplementing.

Supplementing Annotation to Ignore

{
  "id": "https://raw.githubusercontent.com/samvera-labs/clover-iiif/main/public/fixtures/iiif/manifests/captions.json/canvas/1/page/annotation_page/1/annotation/2",
  "type": "Annotation",
  "motivation": "supplementing",
  "body": {
    "id": "https://raw.githubusercontent.com/samvera-labs/clover-iiif/main/public/fixtures/vtt/around_the_corner_chapters.vtt",
    "type": "Text",
    "format": "text/vtt",
    "label": {
      "en": ["Chapters"]
    },
    "language": "en"
  },
  "target": "https://raw.githubusercontent.com/samvera-labs/clover-iiif/main/public/fixtures/iiif/manifests/captions.json/canvas/1"
}

Configuration Option Implementation

export default function App() {
  const id =
    "https://raw.githubusercontent.com/samvera-labs/clover-iiif/main/public/fixtures/iiif/manifests/captions.json";

  const options = {
    ignoreCaptionLabels: ["Chapters"],
  };

  return <CloverIIIF id={id} options={options} />;
}

See Example

---

Custom Theme

You may choose to override the base theme by setting optional colors and fonts. Naming conventions for colors are limited to those shown in the config example below.

const id =
  "https://raw.githubusercontent.com/samvera-labs/clover-iiif/main/public/fixtures/iiif/manifests/sample.json";

const customTheme = {
  colors: {
    /**
     * Black and dark grays in a light theme.
     * All must contrast to 4.5 or greater with `secondary`.
     */
    primary: "#37474F",
    primaryMuted: "#546E7A",
    primaryAlt: "#263238",

    /**
     * Key brand color(s).
     * `accent` must contrast to 4.5 or greater with `secondary`.
     */
    accent: "#C62828",
    accentMuted: "#E57373",
    accentAlt: "#B71C1C",

    /**
     * White and light grays in a light theme.
     * All must must contrast to 4.5 or greater with `primary` and  `accent`.
     */
    secondary: "#FFFFFF",
    secondaryMuted: "#ECEFF1",
    secondaryAlt: "#CFD8DC",
  },
  fonts: {
    sans: "'Avenir', 'Helvetica Neue', sans-serif",
    display: "Optima, Georgia, Arial, sans-serif",
  },
};

return <CloverIIIF id={id} customTheme={customTheme} />;

See Example

---

Reference

Prop	Type	Required	Default
id	string	Yes
manifestId (deprecated)	string	No
canvasIdCallback	function	No
customTheme	object	No
options	object	No
options.canvasBackgroundColor	string	No	#1a1d1e
options.canvasHeight	string	No	500px
options.ignoreCaptionLabels	string[]	No	[]
options.openSeadragon	OpenSeadragon.Options	No
options.renderAbout	boolean	No	true
options.showIIIFBadge	boolean	No	true
options.showInformationToggle	boolean	No	true
options.showTitle	boolean	No	true
options.withCredentials	boolean	No	false

Clover can configured through an options prop, which will serve as a object for common options.

• Options canvasBackgroundColor and canvasHeight will apply to both <video> elements and the OpenseaDragon canvas.
• Options renderAbout and showInformationToggle relate to rendering Manifest content in an <aside> and providing user ability to close that panel.
• The Option withCredentials being set as true will inform IIIF resource requests to be made using credentials such as cookies, authorization headers or TLS client certificates.

You can override the OpenSeadragon default options set within Clover to adjust touch and mouse gesture settings and various other configurations.

import CloverIIIF from "@samvera/clover-iiif";

...

// Supported options
const options = {
  // Primary title (Manifest label) for top level canvas.  Defaults to true
  showTitle: false,

  // IIIF Badge and popover containing options.  Defaults to true
  showIIIFBadge: false,

  // Ignore supplementing canvases by label value that are not for captioning
  ignoreCaptionLabels: ['Chapters'],

  // Override canvas background color, defaults to #1a1d1e
  canvasBackgroundColor: "#000",

  // Set canvas zooming onScoll (this defaults to false)
  openSeadragon: {
    gestureSettingsMouse: {
      scrollToZoom: true;
    }
  }
}
...

<CloverIIIF id={...} options={options} />

---

IIIF Presentation API Requirements

The Manifest or Collection provided to id:

• MUST be a IIIF Presentation API valid manifest,
• MUST have at least one canvas with an annotation of the motivation of painting and content resource with the type of Video, Sound, or Image
• MAY have canvases with annotations of the motivation of supplementing and content resource with the format of text/vtt
• MAY have HLS streaming media, however, the file extension MUST be .m3u8 for Sound and Video

---

Development

Clover IIIF is built with:

• TypeScript
• ESBuild
• Vault
• OpenSeadragon
• Radix UI
• Stitches

Environment

This will open up a local dev server with live reloading.

npm install
npm run dev

Build

This will build and package the component

npm run build

This will create a static version of the site to the /static directory

npm run build:static

Notes

• ESBuild compiles TypeScript to JavaScript, but does not do type checking. To view type checking errors (in addtion to what your IDE will be complaining about), run:

tsc

License

This project is available under the MIT License.