add extension chrome.windows.onFocusChanged

atom/common/api/resources/windows_bindings.js

@@ -1,6 +1,7 @@
 var ipc = require('ipc_utils')
 
 var id = 1;
+var focusId = 1;
 
 var binding = {
   getCurrent: function () {
@@ -46,6 +47,57 @@ var binding = {
     ipc.send('chrome-windows-update', responseId, windowId, updateInfo)
   },
 
+  get: function (windowId, getInfo, cb) {
+    console.warn('chrome.windows.get is not supported yet')
+  },
+
+  getLastFocused: function (getInfo, cb) {
+    console.warn('chrome.windows.getLastFocused is not supported yet')
+  },
+
+  remove: function (windowId, cb) {
+    console.warn('chrome.windows.remove is not supported yet')
+  },
+
+  onCreated: {
+
+    addListener: function (callback) {
+      console.warn('chrome.windows.onCreated is not supported yet')
+    },
+
+    Filters: ['app', 'normal', 'panel', 'popup']
+  },
+
+  onRemoved: {
+
+    addListener: function (callback) {
+      console.warn('chrome.windows.onRemoved is not supported yet')
+    },
+
+    Filters: ['app', 'normal', 'panel', 'popup']
+  },
+
+  onFocusChanged: {
+
+    addListener: function (cb) {
+
+      if(cb.length != 1) {
+        console.warn('Callback has wrong number of arguments.')
+      }
+
+      var responseId = ++focusId
+
+      ipc.on('chrome-windows-focused-window-update-response-' + responseId, function (evt, responseId) {
+        cb(responseId);
+      })
+
+      ipc.send('chrome-windows-focused-window-update', responseId)
+
+    },
+
+    Filters: ['app', 'normal', 'panel', 'popup']
+  },
+
   WINDOW_ID_NONE: -1,
   WINDOW_ID_CURRENT: -2
 };

lib/browser/api/extensions.js

@@ -527,6 +527,48 @@ ipcMain.on('chrome-windows-get-all', function (evt, responseId, getInfo) {
     response)
 })
 
+
+
+ipcMain.on('chrome-windows-focused-window-update', function (evt, responseId) {
+
+  //There are two cases here:
+  //1. A new window gets focus (focus event)
+  //2. All the windows blur (blur event, no focus event)
+  //NB. Created or closed windows won't trigger here - presumably they use onCreated/onRemoved
+
+  app.on('browser-window-focus', function (event, browserWindow) {
+
+    var forthcomingWindow = browserWindow
+    var forthcomingId = (null == forthcomingWindow) ? -1 : forthcomingWindow.id
+
+    evt.sender.send('chrome-windows-focused-window-update-response-' + responseId, forthcomingId)
+  })
+
+
+  app.on('browser-window-blur', function (event, browserWindow) {
+
+    //see https://github.com/electron/electron/issues/4942
+    setImmediate(function() {
+
+      var forthcomingWindow = BrowserWindow.getFocusedWindow()
+
+      var forthcomingId = (null == forthcomingWindow) ? -1 : forthcomingWindow.id
+      var previousId = browserWindow.id
+
+      var allWindowsBlurred = (-1 == forthcomingId && -1 != previousId)
+      if (allWindowsBlurred) {
+        var blurredResponse = -1
+        evt.sender.send('chrome-windows-focused-window-update-response-' + responseId, blurredResponse)
+      }
+
+    });
+  })
+
+})
+
+
+
+
 ipcMain.on('chrome-windows-update', function (evt, responseId, windowId, updateInfo) {
   var response = updateWindow(windowId, updateInfo)
   evt.sender.send('chrome-windows-update-response-' + responseId, response)