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71f3379fcc
* Update frontend to Mithril 2 - Update Mithril version to v2.0.4 - Add Typescript typings for Mithril - Rename "props" to "attrs"; "initProps" to "initAttrs"; "m.prop" to "m.stream"; "m.withAttr" to "utils/withAttr". - Use Mithril 2's new lifecycle hooks - SubtreeRetainer has been rewritten to be more useful for the new system - Utils for forcing page re-initializations have been added (force attr in links, setRouteWithForcedRefresh util) - Other mechanical changes, following the upgrade guide - Remove some of the custom stuff in our Component base class - Introduce "fragments" for non-components that control their own DOM - Remove Mithril patches, introduce a few new ones (route attrs in <a>; - Redesign AlertManagerState `show` with 3 overloads: `show(children)`, `show(attrs, children)`, `show(componentClass, attrs, children)` - The `affixedSidebar` util has been replaced with an `AffixedSidebar` component Challenges: - `children` and `tag` are now reserved, and can not be used as attr names - Behavior of links to current page changed in Mithril. If moving to a page that is handled by the same component, the page component WILL NOT be re-initialized by default. Additional code to keep track of the current url is needed (See IndexPage, DiscussionPage, and UserPage for examples) - Native Promise rejections are shown on console when not handled - Instances of components can no longer be stored. The state pattern should be used instead. Refs #1821. Co-authored-by: Alexander Skvortsov <sasha.skvortsov109@gmail.com> Co-authored-by: Matthew Kilgore <tankerkiller125@gmail.com> Co-authored-by: Franz Liedke <franz@develophp.org>
55 lines
1.6 KiB
JavaScript
55 lines
1.6 KiB
JavaScript
/*global s9e*/
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import Component from '../../common/Component';
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/**
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* The `ComposerPostPreview` component renders Markdown as HTML using the
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* TextFormatter library, polling a data source for changes every 50ms. This is
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* done to prevent expensive redraws on e.g. every single keystroke, while
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* still retaining the perception of live updates for the user.
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*
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* ### Attrs
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*
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* - `composer` The state of the composer controlling this preview.
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* - `className` A CSS class for the element surrounding the preview.
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* - `surround` A callback that can execute code before and after re-render, e.g. for scroll anchoring.
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*/
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export default class ComposerPostPreview extends Component {
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static initAttrs(attrs) {
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attrs.className = attrs.className || '';
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attrs.surround = attrs.surround || ((preview) => preview());
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}
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view() {
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return <div className={this.attrs.className} />;
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}
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oncreate(vnode) {
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super.oncreate(vnode);
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// Every 50ms, if the composer content has changed, then update the post's
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// body with a preview.
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let preview;
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const updatePreview = () => {
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// Since we're polling, the composer may have been closed in the meantime,
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// so we bail in that case.
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if (!this.attrs.composer.isVisible()) return;
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const content = this.attrs.composer.fields.content();
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if (preview === content) return;
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preview = content;
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this.attrs.surround(() => s9e.TextFormatter.preview(preview || '', vnode.dom));
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};
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updatePreview();
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this.updateInterval = setInterval(updatePreview, 50);
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}
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onremove() {
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clearInterval(this.updateInterval);
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}
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}
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