Gallery component (scrollable)

packages/gallery/.npmignore

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+.DS_Store
+*.log
+src
+__tests__
+example
+coverage
+jest.config.js

packages/gallery/README.md

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+# Gallery
+
+Accessible media gallery that can be used inline or in a modal.
+
+---
+
+## Usage
+
+Create the gallery in HTML.
+
+There must be an live region with a `data-gallery-live-region` attribute (an element with `aria-live="polite" aria-atomic="true"` for example) for the accessible announcements.
+Each of the gallery items should have a `data-gallery-item` attribute and an id, which is used to update the document URL and makes slides addressable - you can link to a specific gallery slide using a URL hash matching a slide id. If ids are not added they are programmatically generated.
+
+For navigation, `data-gallery-previous` and `data-gallery-next` attributes on buttons identify them as navigation triggers.
+
+Optionally, a button with `data-gallery-fullscreen` attribute if supporting fullscreen functionality.
+
+Optionally, any buttons with a `data-gallery-navigate` attribute will navigate the gallery to a specific slide, e.g. `data-gallery-navigate="2"`.
+
+```
+<div role="region" class="gallery js-gallery" id="gallery">
+    <div class="gallery__header">
+        <div class="gallery__total" aria-live="polite" aria-atomic="true" data-gallery-live-region>1 of 5</div>
+        <button class="gallery__fullscreen" aria-label="Full screen" data-gallery-fullscreen>
+            <svg class="gallery__fullscreen-icon" focusable="false" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" width="33.547" height="33.281" viewBox="0 0 33.547 33.281">
+                <g transform="translate(-1434 -40.572)">
+                    <path d="M7.334,13.243a.919.919,0,0,0,.007-1.294L3.073,7.667l9.847,0a.914.914,0,0,0,0-1.828l-9.847,0L7.348,1.557A.925.925,0,0,0,7.341.263.91.91,0,0,0,6.054.27L.26,6.106h0a1.026,1.026,0,0,0-.19.288A.872.872,0,0,0,0,6.746a.916.916,0,0,0,.26.64l5.794,5.836A.9.9,0,0,0,7.334,13.243Z" transform="translate(1467.547 50.119) rotate(135)" fill="#fff"/>
+                    <path d="M7.334,13.243a.919.919,0,0,0,.007-1.294L3.073,7.667l9.847,0a.914.914,0,0,0,0-1.828l-9.847,0L7.348,1.557A.925.925,0,0,0,7.341.263.91.91,0,0,0,6.054.27L.26,6.106h0a1.026,1.026,0,0,0-.19.288A.872.872,0,0,0,0,6.746a.916.916,0,0,0,.26.64l5.794,5.836A.9.9,0,0,0,7.334,13.243Z" transform="translate(1434 64.307) rotate(-45)" fill="#fff"/>
+                </g>
+            </svg>
+        </button>
+    </div>
+    <div class="gallery__main">
+        <button class="gallery__previous" aria-label="Previous image" data-gallery-previous>
+            <svg class="gallery__previous-icon" focusable="false" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px"><rect fill="none" height="24" width="24"/><g><polygon points="17.77,3.77 16,2 6,12 16,22 17.77,20.23 9.54,12"/></g></svg>
+        </button>
+        <ul class="gallery__list" tabindex="0">
+            <li class="gallery__item" data-gallery-item id="gallery-1">
+                <div class="gallery__item-img-container">
+                    <picture>
+                        <source srcset="https://placehold.co/1600x1000.jpg" media="(min-width:1000px)">
+                        <source srcset="https://placehold.co/1000x600.png" media="(min-width:700px)">
+                        <source srcset="https://placehold.co/700x400.png" media="(min-width:400px)">
+                        <img loading="lazy" src="https://placehold.co/500x200.png" alt="Test image">
+                    </picture>
+                </div>
+                <div class="gallery__item-footer">
+                    <div class="gallery__item-meta">
+                        <div class="gallery__item-description">
+                            <h2 class="gallery__item-artist">Kate Murphy</h2>
+                            <div class="gallery__item-category">Architecture - March</div>
+                            <div class="gallery__item-title">Example project name here</div>
+                        </div>
+                    </div>
+                </div>
+            </li>
+            <li class="gallery__item" data-gallery-item id="gallery-2">
+                <div class="gallery__item-img-container">
+                    <picture>
+                        <source srcset="https://placehold.co/1600x1400.jpg" media="(min-width:1100px)">
+                        <source srcset="https://placehold.co/1100x1000.png" media="(min-width:710px)">
+                        <source srcset="https://placehold.co/710x900.png" media="(min-width:400px)">
+                        <img loading="lazy" src="https://placehold.co/420x300.png" alt="Test image">
+                    </picture>
+                </div>
+                <div class="gallery__item-footer">
+                    <div class="gallery__item-meta">
+                        <div class="gallery__item-description">
+                            <h2 class="gallery__item-artist">Kate Murphy</h2>
+                            <div class="gallery__item-category">Architecture - April</div>
+                            <div class="gallery__item-title">Example project name here</div>
+                        </div>
+                    </div>
+                </div>
+            </li>
+            <li class="gallery__item" data-gallery-item id="gallery-3">
+                <div class="gallery__item-img-container">
+                    <picture>
+                        <source srcset="https://placehold.co/1630x1500.jpg" media="(min-width:1300px)">
+                        <source srcset="https://placehold.co/1300x1200.png" media="(min-width:730px)">
+                        <source srcset="https://placehold.co/730x300.png" media="(min-width:430px)">
+                        <img loading="lazy" src="https://placehold.co/430x300.png" alt="Test image">
+                    </picture>
+                </div>
+                <div class="gallery__item-footer">
+                    <div class="gallery__item-meta">
+                        <div class="gallery__item-description">
+                            <h2 class="gallery__item-artist">Kate Murphy</h2>
+                            <div class="gallery__item-category">Architecture - May</div>
+                            <div class="gallery__item-title">Example project name here</div>
+                        </div>
+                    </div>
+                </div>
+            </li>
+            <li class="gallery__item" data-gallery-item id="gallery-4">
+                <div class="gallery__item-img-container">
+                    <picture>
+                        <source srcset="https://placehold.co/1640x2400.jpg" media="(min-width:1400px)">
+                        <source srcset="https://placehold.co/1400x2200.png" media="(min-width:740px)">
+                        <source srcset="https://placehold.co/740x1200.png" media="(min-width:440px)">
+                        <img loading="lazy" src="https://placehold.co/430x300.png" alt="Test image">
+                    </picture>
+                </div>
+                <div class="gallery__item-footer">
+                    <div class="gallery__item-meta">
+                        <div class="gallery__item-description">
+                            <h2 class="gallery__item-artist">Kate Murphy</h2>
+                            <div class="gallery__item-category">Architecture - June</div>
+                            <div class="gallery__item-title">Example project name here</div>
+                        </div>
+                    </div>
+                </div>
+            </li>
+        </ul>
+        <button class="gallery__next" aria-label="Next image" data-gallery-next>
+            <svg class="gallery__next-icon" focusable="false" aria-hidden="true" xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px"><g><path d="M0,0h24v24H0V0z" fill="none"/></g><g><polygon points="6.23,20.23 8,22 18,12 8,2 6.23,3.77 14.46,12"/></g></svg>
+        </button>
+    </div>
+</div>
+```
+
+Install the package
+```
+npm i -S @stormid/gallery
+```
+
+Initialise the gallery
+```
+import gallery from '@stormid/gallery';
+
+const [instance] = gallery('.js-gallery');
+## Options
+
+```
+{
+    startIndex: 0,
+    selector: { //selectors for the gallery elements
+        list: '[data-gallery-list]',
+        item: '[data-gallery-item]',
+        fullscreen: '[data-gallery-fullscreen]',
+        liveRegion: '[data-gallery-live-region]',
+        previous: '[data-gallery-previous]',
+        next: '[data-gallery-next]',
+        navigate: '[data-gallery-navigate]'
+    },
+    className: { // classNames used to style different gallery states
+        active: 'is--active',
+        fullscreen: 'is--fullscreen'
+    },
+    manualInitialisation: false, // to prevent automatic initialisation, so it can be initialised via the API
+    updateURL: true, //change URL when item changes
+    announcement(current, total){ //template for the accessible announcement
+        return `${current} of ${total}`;
+    }
+}
+```
+
+## API
+gallery() returns an array of instances. Each instance exposes the interface
+```
+{
+    getState // return the current state Object
+    initialise // to manually initialise if manualInitialisation setting is true
+    goTo // navigate to a slide index (zero indexed)
+    toggleFullScreen // set the gallery to full screen
+}
+```
+
+## Events
+There are 2 events that an instance of the gallery dispatches:
+- `gallery.initialised` when it's initialised
+- `gallery.change` when navigating to a different slide
+
+
+## Tests
+```
+npm t
+```
+
+## License
+MIT