格式擴充

這篇文章將闡述格式擴充插件的基本概念。

格式擴充插件的主要目的是使 Eagle 能夠預覽尚未支援的檔案格式。與其他類型插件不同，格式擴充插件在 manifest.json 中不需要定義 main 屬性，而是需要設定 preview 屬性。以下是一個範例程式碼：

"preview": {}

在 preview 中可以定義要擴充的檔案副檔名。例如，如果想要讓 Eagle 支援 icns 圖示格式，可以輸入 "icns": {}：

"preview" : {
    "icns": {}
}

另外，如果你需要同時設定多個副檔名，你可以使用 , 將不同副檔名隔開進行定義，比如：

"preview" : {
    "icns,ico": {}
}

格式擴充插件可以分成兩個部分：

"thumbnail.path"：提供用於解析要擴充的檔案格式的縮圖的 .js 檔案。
"viewer.path"：提供用於預覽要擴充的格式的 .html 檔案。

"preview": {
    "icns": {
        "thumbnail": {
            "path": "thumbnail/icns.js",
            "size": 400,
            "allowZoom": false
        },
        "viewer": {
            "path": "viewer/icns.html"
        }
    }
}

設定其它 metadata.json 欄位後，最終程式碼如下：

{
    "id": "LARSKLB8OTOC2",
    "version": "1.0.0",
    "platform": "all",
    "arch": "all",
    "name": "Preview Plugin",
    "logo": "/logo.png",
    "keywords": [
        "icns"
    ],
    "devTools": false,
    "preview": {
        "icns": {
            "thumbnail": {
                "path": "thumbnail/icns.js",
                "size": 400,
                "allowZoom": false
            },
            "viewer": {
                "path": "viewer/icns.html"
            }
        }
    }
}

const fs = require('fs');
const icns = require('./../js/icns-util.js');
const imageSize = require('./../js/image-size.js');

module.exports = async ({ src, dest, item }) => {
    return new Promise(async (resolve, reject) => {
        try {
            // 1. parsing and generate thumbnail file to dest
            await icns.icns2png(src, dest);
            let size = await imageSize(dest);

            // 2. Check if the result is correct
            if (!fs.existsSync(dest) || size.width === 0) {
                return reject(new Error(`icns file thumbnail generate fail.`));
            }

            // 3. update the item dimensions
            item.height = size?.height || item.height;
            item.width = size?.width || item.width;

            // 4. return the result
            return resolve(item);
        }
        catch (err) {
            return reject(err);
        }
    });
}

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>ICNS Viewer</title>
    <style>
        html, body {
            margin: 0;
            padding: 0;
            overflow: hidden;
        }
        #viewer {
            pointer-events: none;
            object-fit: contain;
            object-position: center;
            width: 100%;
            height: 100%;
            max-width: 100vw;
            max-height: 100vh;
        }
    </style>
</head>
<body>
    <img id="viewer"/>
    <script>
        const urlParams = new URLSearchParams(window.location.search);
        const id = urlParams.get('id');
        const filePath = urlParams.get('path');
        const width = urlParams.get('width');
        const height = urlParams.get('height');
        const theme = urlParams.get('theme');
        const lang = urlParams.get('lang');

        const viewer = document.querySelector('#viewer');

        // 1. Load the thumbnail image first
        // 👍 Avoid loading for too long, and UI has no content
        viewer.src = filePath.replace(".icns", "_thumbnail.png");

        // 2. Load the file and replace thumbnail
        (async function() {
            const icns = require('./../js/icns-util.js');
            let buffer = await icns.icns2buffer(filePath);
            let base64 = `data:image/png;base64,${buffer.toString('base64')}`;
            viewer.src = base64;
        })();
    </script>
</body>
</html>

請注意，目前格式擴充插件不支援 Eagle Plugin API 和 DevTools 除錯功能。

完整範例程式碼： https://github.com/eagle-app/eagle-plugin-examples/tree/main/Preview

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"preview": { "icns": { "thumbnail": { "path": "thumbnail/icns.js", "size": 400, "allowZoom": false }, "viewer": { "path": "viewer/icns.html" } } }

{ "id": "LARSKLB8OTOC2", "version": "1.0.0", "platform": "all", "arch": "all", "name": "Preview Plugin", "logo": "/logo.png", "keywords": [ "icns" ], "devTools": false, "preview": { "icns": { "thumbnail": { "path": "thumbnail/icns.js", "size": 400, "allowZoom": false }, "viewer": { "path": "viewer/icns.html" } } } }

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>ICNS Viewer</title> <style> html, body { margin: 0; padding: 0; overflow: hidden; } #viewer { pointer-events: none; object-fit: contain; object-position: center; width: 100%; height: 100%; max-width: 100vw; max-height: 100vh; } </style> </head> <body> <img id="viewer"/> <script> const urlParams = new URLSearchParams(window.location.search); const id = urlParams.get('id'); const filePath = urlParams.get('path'); const width = urlParams.get('width'); const height = urlParams.get('height'); const theme = urlParams.get('theme'); const lang = urlParams.get('lang'); const viewer = document.querySelector('#viewer'); // 1. Load the thumbnail image first // 👍 Avoid loading for too long, and UI has no content viewer.src = filePath.replace(".icns", "_thumbnail.png"); // 2. Load the file and replace thumbnail (async function() { const icns = require('./../js/icns-util.js'); let buffer = await icns.icns2buffer(filePath); let base64 = `data:image/png;base64,${buffer.toString('base64')}`; viewer.src = base64; })(); </script> </body> </html>