trilium/src/public/javascripts/services/zoom.js

import options from "./options.js";
import Component from "../widgets/component.js";

const MIN_ZOOM = 0.5;
const MAX_ZOOM = 2.0;

export default class ZoomService extends Component {
    constructor(appContext, parent) {
        super(appContext, parent);

        this.setZoomFactor(options.getFloat('zoomFactor'));
    }

    setZoomFactor(zoomFactor) {
        zoomFactor = parseFloat(zoomFactor);
    
        const webFrame = require('electron').webFrame;
        webFrame.setZoomFactor(zoomFactor);
    }
    
    async setZoomFactorAndSave(zoomFactor) {
        if (zoomFactor >= MIN_ZOOM && zoomFactor <= MAX_ZOOM) {
            this.setZoomFactor(zoomFactor);
    
            await options.save('zoomFactor', zoomFactor);
        }
        else {
            console.log(`Zoom factor ${zoomFactor} outside of the range, ignored.`);
        }
    }
    
    getCurrentZoom() {
        return require('electron').webFrame.getZoomFactor();
    }

    zoomOutListener() {
        this.setZoomFactorAndSave(this.getCurrentZoom() - 0.1);
    }

    zoomInListener() {
        this.setZoomFactorAndSave(this.getCurrentZoom() + 0.1);
    }

    setZoomFactorAndSaveListener({zoomFactor}) {
        this.setZoomFactorAndSave(zoomFactor);
    }
}