mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-12-26 17:34:11 -05:00
9ce5e092f3
When starting a scroll while the mouse is over a mermaid diagram, the scroll sometimes propagates to the iframe, preventing the parent page from scrolling. Fix this by disabling scroll inside the iframe. This is not a problem because those frames are never meant to scroll. Bug seems to affect Firefox only. 
67 lines
2.3 KiB
JavaScript
67 lines
2.3 KiB
JavaScript
import {isDarkTheme} from '../utils.js';
|
|
const {mermaidMaxSourceCharacters} = window.config;
|
|
|
|
const iframeCss = `
|
|
:root {color-scheme: normal}
|
|
body {margin: 0; padding: 0; overflow: hidden}
|
|
#mermaid {display: block; margin: 0 auto}
|
|
`;
|
|
|
|
function displayError(el, err) {
|
|
el.closest('pre').classList.remove('is-loading');
|
|
const errorNode = document.createElement('div');
|
|
errorNode.setAttribute('class', 'ui message error markup-block-error mono');
|
|
errorNode.textContent = err.str || err.message || String(err);
|
|
el.closest('pre').before(errorNode);
|
|
}
|
|
|
|
export async function renderMermaid() {
|
|
const els = document.querySelectorAll('.markup code.language-mermaid');
|
|
if (!els.length) return;
|
|
|
|
const {default: mermaid} = await import(/* webpackChunkName: "mermaid" */'mermaid');
|
|
|
|
mermaid.initialize({
|
|
startOnLoad: false,
|
|
theme: isDarkTheme() ? 'dark' : 'neutral',
|
|
securityLevel: 'strict',
|
|
});
|
|
|
|
for (const el of els) {
|
|
const source = el.textContent;
|
|
|
|
if (mermaidMaxSourceCharacters >= 0 && source.length > mermaidMaxSourceCharacters) {
|
|
displayError(el, new Error(`Mermaid source of ${source.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`));
|
|
continue;
|
|
}
|
|
|
|
let valid;
|
|
try {
|
|
valid = mermaid.parse(source);
|
|
} catch (err) {
|
|
displayError(el, err);
|
|
}
|
|
|
|
if (!valid) {
|
|
el.closest('pre').classList.remove('is-loading');
|
|
continue;
|
|
}
|
|
|
|
try {
|
|
// can't use bindFunctions here because we can't cross the iframe boundary. This
|
|
// means js-based interactions won't work but they aren't intended to work either
|
|
mermaid.mermaidAPI.render('mermaid', source, (svgStr) => {
|
|
const heightStr = (svgStr.match(/viewBox="(.+?)"/) || ['', ''])[1].split(/\s+/)[3];
|
|
if (!heightStr) return displayError(el, new Error('Could not determine chart height'));
|
|
const iframe = document.createElement('iframe');
|
|
iframe.classList.add('markup-render');
|
|
iframe.sandbox = 'allow-scripts';
|
|
iframe.style.height = `${Math.ceil(parseFloat(heightStr))}px`;
|
|
iframe.srcdoc = `<html><head><style>${iframeCss}</style></head><body>${svgStr}</body></html>`;
|
|
el.closest('pre').replaceWith(iframe);
|
|
});
|
|
} catch (err) {
|
|
displayError(el, err);
|
|
}
|
|
}
|
|
}
|