fix(electron): optimize electron open/close on mac (#6224)

1. never close main window on mac to allow it to be quickly open
1. make the browser show a bit faster
2. brought up app window when clicking some menu items

packages/frontend/electron/src/main/application-menu/create.ts

@@ -2,6 +2,7 @@ import { app, Menu } from 'electron';
 
 import { isMacOS } from '../../shared/utils';
 import { revealLogFile } from '../logger';
+import { initAndShowMainWindow } from '../main-window';
 import { checkForUpdates } from '../updater';
 import { applicationMenuSubjects } from './subject';
 
@@ -42,7 +43,9 @@ export function createApplicationMenu() {
           id: MENUITEM_NEW_PAGE,
           label: 'New Doc',
           accelerator: isMac ? 'Cmd+N' : 'Ctrl+N',
-          click: () => {
+          click: async () => {
+            await initAndShowMainWindow();
+            // fixme: if the window is just created, the new page action will not be triggered
             applicationMenuSubjects.newPageAction.next();
           },
         },
@@ -100,7 +103,12 @@ export function createApplicationMenu() {
               { type: 'separator' },
               { role: 'front' },
               { type: 'separator' },
-              { role: 'window' },
+              {
+                role: 'window',
+                click: async () => {
+                  await initAndShowMainWindow();
+                },
+              },
             ]
           : [{ role: 'close' }]),
       ],
@@ -125,6 +133,7 @@ export function createApplicationMenu() {
         {
           label: 'Check for Updates',
           click: async () => {
+            await initAndShowMainWindow();
             await checkForUpdates();
           },
         },

packages/frontend/electron/src/main/index.ts

@@ -52,9 +52,7 @@ if (!isSingleInstance) {
  * Shout down background process if all windows was closed
  */
 app.on('window-all-closed', () => {
-  if (process.platform !== 'darwin') {
-    app.quit();
-  }
+  app.quit();
 });
 
 /**

packages/frontend/electron/src/main/main-window.ts

@@ -27,6 +27,14 @@ const getWindowAdditionalArguments = async () => {
   ];
 };
 
+function closeAllWindows() {
+  BrowserWindow.getAllWindows().forEach(w => {
+    if (!w.isDestroyed()) {
+      w.destroy();
+    }
+  });
+}
+
 async function createWindow(additionalArguments: string[]) {
   logger.info('create window');
   const mainWindowState = electronWindowState({
@@ -82,12 +90,7 @@ async function createWindow(additionalArguments: string[]) {
    * @see https://github.com/electron/electron/issues/25012
    */
   browserWindow.on('ready-to-show', () => {
-    if (IS_DEV) {
-      // do not gain focus in dev mode
-      browserWindow.showInactive();
-    } else {
-      browserWindow.show();
-    }
+    helperConnectionUnsub?.();
     helperConnectionUnsub = helperProcessManager.connectRenderer(
       browserWindow.webContents
     );
@@ -96,15 +99,26 @@ async function createWindow(additionalArguments: string[]) {
   });
 
   browserWindow.on('close', e => {
-    e.preventDefault();
-    // close and destroy all windows
-    BrowserWindow.getAllWindows().forEach(w => {
-      if (!w.isDestroyed()) {
-        w.destroy();
-      }
-    });
-    helperConnectionUnsub?.();
     // TODO: gracefully close the app, for example, ask user to save unsaved changes
+    e.preventDefault();
+    if (!isMacOS()) {
+      closeAllWindows();
+    } else {
+      // hide window on macOS
+      // application quit will be handled by closing the hidden window
+      //
+      // explanation:
+      // - closing the top window (by clicking close button or CMD-w)
+      //   - will be captured in "close" event here
+      //   - hiding the app to make the app open faster when user click the app icon
+      // - quit the app by "cmd+q" or right click on the dock icon and select "quit"
+      //   - all browser windows will capture the "close" event
+      //   - the hidden window will close all windows
+      //   - "window-all-closed" event will be emitted and eventually quit the app
+      browserWindow.hide();
+    }
+    helperConnectionUnsub?.();
+    helperConnectionUnsub = undefined;
   });
 
   browserWindow.on('leave-full-screen', () => {
@@ -148,15 +162,37 @@ async function createWindow(additionalArguments: string[]) {
 // singleton
 let browserWindow$: Promise<BrowserWindow> | undefined;
 
+// a hidden window that prevents the app from quitting on MacOS
+let hiddenMacWindow: BrowserWindow | undefined;
+
 /**
  * Init main BrowserWindow. Will create a new window if it's not created yet.
  */
-export async function initMainWindow() {
+export async function initAndShowMainWindow() {
   if (!browserWindow$ || (await browserWindow$.then(w => w.isDestroyed()))) {
     const additionalArguments = await getWindowAdditionalArguments();
     browserWindow$ = createWindow(additionalArguments);
   }
   const mainWindow = await browserWindow$;
+
+  if (IS_DEV) {
+    // do not gain focus in dev mode
+    mainWindow.showInactive();
+  } else {
+    mainWindow.show();
+  }
+
+  if (!hiddenMacWindow && isMacOS()) {
+    hiddenMacWindow = new BrowserWindow({
+      show: false,
+      width: 100,
+      height: 100,
+    });
+    hiddenMacWindow.on('close', () => {
+      closeAllWindows();
+    });
+  }
+
   return mainWindow;
 }
 

packages/frontend/electron/src/main/ui/handlers.ts

@@ -4,7 +4,7 @@ import { getLinkPreview } from 'link-preview-js';
 import { isMacOS } from '../../shared/utils';
 import { persistentConfig } from '../config-storage/persist';
 import { logger } from '../logger';
-import { getMainWindow, initMainWindow } from '../main-window';
+import { getMainWindow, initAndShowMainWindow } from '../main-window';
 import { getOnboardingWindow } from '../onboarding';
 import type { NamespaceHandlers } from '../type';
 import { launchStage } from '../windows-manager/stage';
@@ -58,7 +58,7 @@ export const uiHandlers = {
     try {
       const onboarding = await getOnboardingWindow();
       onboarding?.hide();
-      await initMainWindow();
+      await initAndShowMainWindow();
       // need to destroy onboarding window after main window is ready
       // otherwise the main window will be closed as well
       onboarding?.destroy();

packages/frontend/electron/src/main/windows-manager/launcher.ts

@@ -1,5 +1,5 @@
 import { logger } from '../logger';
-import { initMainWindow } from '../main-window';
+import { initAndShowMainWindow } from '../main-window';
 import {
   getOnboardingWindow,
   getOrCreateOnboardingWindow,
@@ -12,7 +12,7 @@ import { launchStage } from './stage';
 export async function launch() {
   const stage = launchStage.value;
   if (stage === 'main') {
-    initMainWindow().catch(e => {
+    initAndShowMainWindow().catch(e => {
       logger.error('Failed to restore or create window:', e);
     });