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joplin/packages/app-desktop/gui/note-viewer/preload.js
2020-11-05 16:58:23 +00:00

41 lines
1.6 KiB
JavaScript

// In order to give access to the webview to certain functions of the main process, we need
// this bridge which listens from the main process and sends to the webview and the other
// way around. This is necessary after having enabled the "contextIsolation" option, which
// prevents the webview from accessing low-level methods in the main process.
const ipcRenderer = require('electron').ipcRenderer;
ipcRenderer.on('setHtml', (event, html, options) => {
window.postMessage({ target: 'webview', name: 'setHtml', data: { html: html, options: options } }, '*');
});
ipcRenderer.on('scrollToHash', (event, hash) => {
window.postMessage({ target: 'webview', name: 'scrollToHash', data: { hash: hash } }, '*');
});
ipcRenderer.on('setPercentScroll', (event, percent) => {
window.postMessage({ target: 'webview', name: 'setPercentScroll', data: { percent: percent } }, '*');
});
ipcRenderer.on('setMarkers', (event, keywords, options) => {
window.postMessage({ target: 'webview', name: 'setMarkers', data: { keywords: keywords, options: options } }, '*');
});
window.addEventListener('message', event => {
// Here we only deal with messages that are sent from the webview to the main Electron process
if (!event.data || event.data.target !== 'main') return;
const callName = event.data.name;
const args = event.data.args;
if (args.length === 0) {
ipcRenderer.sendToHost(callName);
} else if (args.length === 1) {
ipcRenderer.sendToHost(callName, args[0]);
} else if (args.length === 2) {
ipcRenderer.sendToHost(callName, args[1]);
} else {
throw new Error('Unsupported number of args');
}
});