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Add alchemy-picture-thumbnail component
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| module Alchemy | ||
| module Admin | ||
| class PictureThumbnail < ViewComponent::Base | ||
| attr_reader :picture, :url | ||
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| def initialize(picture, size: :medium) | ||
| @picture = picture | ||
| @url = picture.thumbnail_url(size: preview_size(size)) | ||
| end | ||
|
|
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| def call | ||
| content_tag("alchemy-picture-thumbnail") do | ||
| image_tag(url, alt: picture.name) | ||
| end | ||
| end | ||
|
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| private | ||
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| def preview_size(size) | ||
| Alchemy::Picture::THUMBNAIL_SIZES.fetch( | ||
| size, | ||
| Alchemy::Picture::THUMBNAIL_SIZES[:medium] | ||
| ) | ||
| end | ||
| end | ||
| end | ||
| end |
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118 changes: 118 additions & 0 deletions
118
app/javascript/alchemy_admin/components/picture_thumbnail.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| import Spinner from "alchemy_admin/spinner" | ||
|
|
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| const MAX_RETRIES = 10 | ||
| const WAIT_TIME = 1000 | ||
| const OFFSET_INCREMENT = 100 | ||
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| class PictureThumbnail extends HTMLElement { | ||
| #retries = MAX_RETRIES | ||
| #retryOffset = 0 | ||
| #started = false | ||
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| constructor() { | ||
| super() | ||
| this.observer = new MutationObserver(this.handleMutation.bind(this)) | ||
| this.classList.add("thumbnail_background") | ||
| this.spinner = new Spinner(this.spinnerSize) | ||
| } | ||
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| connectedCallback() { | ||
| if (this.image && !this.image.complete) { | ||
| this.start() | ||
| } | ||
| this.observer.observe(this, { | ||
| subtree: true, | ||
| childList: true, | ||
| attributes: true, | ||
| attributeOldValue: true, | ||
| attributeFilter: ["src"] | ||
| }) | ||
| } | ||
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| disconnectedCallback() { | ||
| this.observer.disconnect() | ||
| this.reset() | ||
| } | ||
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| handleMutation(mutations) { | ||
| mutations.forEach((mutation) => { | ||
| const hasImage = | ||
| mutation.type == "childList" && | ||
| Array.from(mutation.addedNodes).some((node) => node.nodeName === "IMG") | ||
| const sourceChanged = | ||
| mutation.type == "attributes" && | ||
| mutation.oldValue !== mutation.target.src | ||
| if (hasImage || sourceChanged) { | ||
| this.start() | ||
| } | ||
| }) | ||
| } | ||
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| handleEvent(event) { | ||
| switch (event.type) { | ||
| case "load": | ||
| this.showImage() | ||
| break | ||
| case "error": | ||
| this.retry() | ||
| break | ||
| } | ||
| } | ||
|
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| start() { | ||
| if (this.#started) return | ||
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| this.#started = true | ||
| this.image.classList.add("hidden") | ||
| this.spinner.spin(this) | ||
| this.image.addEventListener("load", this) | ||
| this.image.addEventListener("error", this) | ||
| } | ||
|
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| showImage() { | ||
| this.#started = false | ||
| this.image.classList.remove("hidden") | ||
| this.classList.add("loaded") | ||
| this.spinner.stop() | ||
| this.reset() | ||
| } | ||
|
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| retry() { | ||
| if (this.#retries > 0) { | ||
| this.#retries-- | ||
| setTimeout(() => { | ||
| this.image.src = this.image.src | ||
| }, WAIT_TIME + this.#retryOffset) | ||
| this.#retryOffset += OFFSET_INCREMENT | ||
| } else { | ||
| this.showError() | ||
| } | ||
| } | ||
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| showError() { | ||
| const message = `Could not load "${this.image.src}"` | ||
| console.error(message) | ||
| this.innerHTML = `<span class="icon error ri-file-damage-line" title="${message}" />` | ||
| this.reset() | ||
| } | ||
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| reset() { | ||
| this.#started = false | ||
| this.#retries = MAX_RETRIES | ||
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| if (this.image) { | ||
| this.image.removeEventListener("load", this) | ||
| this.image.removeEventListener("error", this) | ||
| } | ||
| } | ||
|
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| get spinnerSize() { | ||
| return this.getAttribute("spinner-size") || "small" | ||
| } | ||
|
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| get image() { | ||
| return this.querySelector("img") | ||
| } | ||
| } | ||
|
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| customElements.define("alchemy-picture-thumbnail", PictureThumbnail) |
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