From 55a79cd69f11da0fe33aaea2ac469dbcd27efee9 Mon Sep 17 00:00:00 2001
From: Johannes Millan <johannes.millan@gmail.com>
Date: Fri, 23 Nov 2018 17:02:02 +0100
Subject: [PATCH] feat: add mousewheel zoom for electron

---
 src/app/app.component.ts | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index 771e99f4c8..e620aa7c27 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -66,6 +66,7 @@ export class AppComponent implements OnInit {
     if (IS_ELECTRON) {
       this._electronService.ipcRenderer.send(IPC_APP_READY);
       this._initElectronErrorHandler();
+      this._initMousewheelZoomForElectron();
 
       this._electronService.ipcRenderer.on(IPC_TRANSFER_SETTINGS_REQUESTED, () => {
         this._electronService.ipcRenderer.send(IPC_TRANSFER_SETTINGS_TO_ELECTRON, this._configService.cfg);
@@ -152,4 +153,19 @@ export class AppComponent implements OnInit {
       console.error(data);
     });
   }
+
+  private _initMousewheelZoomForElectron() {
+    const ZOOM_DELTA = 0.05;
+    const webFrame = this._electronService.webFrame;
+    document.addEventListener('mousewheel', (event: MouseWheelEvent) => {
+      if (event && event.ctrlKey) {
+        const zoomFactor = webFrame.getZoomFactor();
+        if (event.deltaY > 0) {
+          webFrame.setZoomFactor(zoomFactor + ZOOM_DELTA);
+        } else if (event.deltaY < 0) {
+          webFrame.setZoomFactor(zoomFactor - ZOOM_DELTA);
+        }
+      }
+    }, false);
+  }
 }