From 584b24ebfe8ca50808326e71e3fd82b138b52e3c Mon Sep 17 00:00:00 2001
From: Jonas Schwabe <jonas@jnugh.de>
Date: Sun, 9 Apr 2017 13:15:51 +0200
Subject: [PATCH] Add display-metrics-changed handler to place window on screen
 on display matrics change

---
 src/main.js            | 49 ++++++++++++++++++++++++++++++++++++++++++
 src/main/mainWindow.js | 32 ++-------------------------
 2 files changed, 51 insertions(+), 30 deletions(-)

diff --git a/src/main.js b/src/main.js
index a1ea01fb..d0f4a644 100644
--- a/src/main.js
+++ b/src/main.js
@@ -213,6 +213,55 @@ app.on('window-all-closed', () => {
   }
 });
 
+function getValidWindowPosition(state, screen) {
+  // Check if the previous position is out of the viewable area
+  // (e.g. because the screen has been plugged off)
+  const displays = screen.getAllDisplays();
+  let minX = 0;
+  let maxX = 0;
+  let minY = 0;
+  let maxY = 0;
+  for (let i = 0; i < displays.length; i++) {
+    const display = displays[i];
+    maxX = Math.max(maxX, display.bounds.x + display.bounds.width);
+    maxY = Math.max(maxY, display.bounds.y + display.bounds.height);
+    minX = Math.min(minX, display.bounds.x);
+    minY = Math.min(minY, display.bounds.y);
+  }
+
+  if (state.x > maxX || state.y > maxY || state.x < minX || state.y < minY) {
+    Reflect.deleteProperty(state, 'x');
+    Reflect.deleteProperty(state, 'y');
+    Reflect.deleteProperty(state, 'width');
+    Reflect.deleteProperty(state, 'height');
+  }
+
+  return state;
+}
+
+function handleScreenResize(screen, browserWindow) {
+  function handle() {
+    const position = browserWindow.getPosition();
+    const size = browserWindow.getSize();
+    const validPosition = getValidWindowPosition({
+      x: position[0],
+      y: position[1],
+      width: size[0],
+      height: size[1]
+    }, screen);
+    browserWindow.setPosition(validPosition.x || 0, validPosition.y || 0);
+  }
+
+  browserWindow.on('restore', handle);
+  handle();
+}
+
+app.on('browser-window-created', (e, newWindow) => {
+  // Screen cannot be required before app is ready
+  const {screen} = require('electron'); // eslint-disable-line global-require
+  handleScreenResize(screen, newWindow);
+});
+
 // For OSX, show hidden mainWindow when clicking dock icon.
 app.on('activate', () => {
   mainWindow.show();
diff --git a/src/main/mainWindow.js b/src/main/mainWindow.js
index 5b0dd42d..83175758 100644
--- a/src/main/mainWindow.js
+++ b/src/main/mainWindow.js
@@ -14,35 +14,6 @@ function saveWindowState(file, window) {
   }
 }
 
-function getValidWindowPosition(state) {
-  // Screen cannot be required before app is ready
-  const {screen} = require('electron'); // eslint-disable-line global-require
-
-  // Check if the previous position is out of the viewable area
-  // (e.g. because the screen has been plugged off)
-  const displays = screen.getAllDisplays();
-  let minX = 0;
-  let maxX = 0;
-  let minY = 0;
-  let maxY = 0;
-  for (let i = 0; i < displays.length; i++) {
-    const display = displays[i];
-    maxX = Math.max(maxX, display.bounds.x + display.bounds.width);
-    maxY = Math.max(maxY, display.bounds.y + display.bounds.height);
-    minX = Math.min(minX, display.bounds.x);
-    minY = Math.min(minY, display.bounds.y);
-  }
-
-  if (state.x > maxX || state.y > maxY || state.x < minX || state.y < minY) {
-    Reflect.deleteProperty(state, 'x');
-    Reflect.deleteProperty(state, 'y');
-    Reflect.deleteProperty(state, 'width');
-    Reflect.deleteProperty(state, 'height');
-  }
-
-  return state;
-}
-
 function createMainWindow(config, options) {
   const defaultWindowWidth = 1000;
   const defaultWindowHeight = 700;
@@ -53,11 +24,12 @@ function createMainWindow(config, options) {
   const boundsInfoPath = path.join(app.getPath('userData'), 'bounds-info.json');
   var windowOptions;
   try {
-    windowOptions = getValidWindowPosition(JSON.parse(fs.readFileSync(boundsInfoPath, 'utf-8')));
+    windowOptions = JSON.parse(fs.readFileSync(boundsInfoPath, 'utf-8'));
   } catch (e) {
     // Follow Electron's defaults, except for window dimensions which targets 1024x768 screen resolution.
     windowOptions = {width: defaultWindowWidth, height: defaultWindowHeight};
   }
+
   if (process.platform === 'linux') {
     windowOptions.icon = options.linuxAppIcon;
   }