74 lines
2.0 KiB
JavaScript
74 lines
2.0 KiB
JavaScript
/* global messageBox editor $ prefs */
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/* exported createLivePreview */
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'use strict';
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function createLivePreview(preprocess) {
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let data;
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let previewer;
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let enabled = prefs.get('editor.livePreview');
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const label = $('#preview-label');
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const errorContainer = $('#preview-errors');
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prefs.subscribe(['editor.livePreview'], (key, value) => {
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if (value && data && data.id && data.enabled) {
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previewer = createPreviewer();
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previewer.update(data);
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}
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if (!value && previewer) {
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previewer.disconnect();
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previewer = null;
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}
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enabled = value;
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});
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return {update, show};
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function show(state) {
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label.classList.toggle('hidden', !state);
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}
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function update(_data) {
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data = _data;
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if (!previewer) {
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if (!data.id || !data.enabled || !enabled) {
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return;
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}
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previewer = createPreviewer();
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}
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previewer.update(data);
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}
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function createPreviewer() {
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const port = chrome.runtime.connect({
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name: 'livePreview'
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});
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port.onDisconnect.addListener(err => {
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throw err;
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});
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return {update, disconnect};
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function update(data) {
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Promise.resolve()
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.then(() => preprocess ? preprocess(data) : data)
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.then(data => port.postMessage(data))
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.then(
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() => errorContainer.classList.add('hidden'),
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err => {
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if (Array.isArray(err)) {
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err = err.join('\n');
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} else if (err && err.index !== undefined) {
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// FIXME: this would fail if editors[0].getValue() !== data.sourceCode
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const pos = editor.getEditors()[0].posFromIndex(err.index);
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err.message = `${pos.line}:${pos.ch} ${err.message || String(err)}`;
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}
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errorContainer.classList.remove('hidden');
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errorContainer.onclick = () => messageBox.alert(err.message || String(err), 'pre');
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}
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);
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}
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function disconnect() {
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port.disconnect();
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}
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}
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}
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