fix setup of new document, closes #966

src/public/app/services/zoom.js

@@ -0,0 +1,48 @@
+import options from "./options.js";
+import Component from "../widgets/component.js";
+import utils from "../services/utils.js";
+
+const MIN_ZOOM = 0.5;
+const MAX_ZOOM = 2.0;
+
+export default class ZoomService extends Component {
+    constructor() {
+        super();
+
+        this.setZoomFactor(options.getFloat('zoomFactor'));
+    }
+
+    setZoomFactor(zoomFactor) {
+        zoomFactor = parseFloat(zoomFactor);
+    
+        const webFrame = utils.dynamicRequire('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 utils.dynamicRequire('electron').webFrame.getZoomFactor();
+    }
+
+    zoomOutEvent() {
+        this.setZoomFactorAndSave(this.getCurrentZoom() - 0.1);
+    }
+
+    zoomInEvent() {
+        this.setZoomFactorAndSave(this.getCurrentZoom() + 0.1);
+    }
+
+    setZoomFactorAndSaveEvent({zoomFactor}) {
+        this.setZoomFactorAndSave(zoomFactor);
+    }
+}