[OS X] Implement 'activate-with-open-windows' event for app.

atom/browser/api/atom_api_app.cc

@@ -171,6 +171,10 @@ void App::OnActivateWithNoOpenWindows() {
   Emit("activate-with-no-open-windows");
 }
 
+void App::OnActivateWithOpenWindows() {
+  Emit("activate-with-open-windows");
+}
+
 void App::OnWillFinishLaunching() {
   Emit("will-finish-launching");
 }

atom/browser/api/atom_api_app.h

@@ -42,6 +42,7 @@ class App : public mate::EventEmitter,
   void OnOpenFile(bool* prevent_default, const std::string& file_path) override;
   void OnOpenURL(const std::string& url) override;
   void OnActivateWithNoOpenWindows() override;
+  void OnActivateWithOpenWindows() override;
   void OnWillFinishLaunching() override;
   void OnFinishLaunching() override;
   void OnSelectCertificate(

atom/browser/browser.cc

@@ -98,6 +98,10 @@ void Browser::ActivateWithNoOpenWindows() {
   FOR_EACH_OBSERVER(BrowserObserver, observers_, OnActivateWithNoOpenWindows());
 }
 
+void Browser::ActivateWithOpenWindows() {
+  FOR_EACH_OBSERVER(BrowserObserver, observers_, OnActivateWithOpenWindows());
+}
+
 void Browser::WillFinishLaunching() {
   FOR_EACH_OBSERVER(BrowserObserver, observers_, OnWillFinishLaunching());
 }

atom/browser/browser.h

@@ -111,6 +111,9 @@ class Browser : public WindowListObserver {
   // Tell the application that application is activated with no open windows.
   void ActivateWithNoOpenWindows();
 
+  // Tell the application that application is activated with open windows.
+  void ActivateWithOpenWindows();
+
   // Tell the application the loading has been done.
   void WillFinishLaunching();
   void DidFinishLaunching();

atom/browser/browser_observer.h

@@ -47,6 +47,10 @@ class BrowserObserver {
   // dock icon).
   virtual void OnActivateWithNoOpenWindows() {}
 
+  // The browser is activated with open windows (usually by clicking on the dock
+  // icon).
+  virtual void OnActivateWithOpenWindows() {}
+
   // The browser has finished loading.
   virtual void OnWillFinishLaunching() {}
   virtual void OnFinishLaunching() {}

atom/browser/mac/atom_application_delegate.mm

@@ -53,6 +53,7 @@
                     hasVisibleWindows:(BOOL)flag {
   atom::Browser* browser = atom::Browser::Get();
   if (flag) {
+    browser->ActivateWithOpenWindows();
     return YES;
   } else {
     browser->ActivateWithNoOpenWindows();

docs/api/app.md

@@ -100,6 +100,11 @@ Emitted when the application is activated while there are no open windows, which
 usually happens when the user has closed all of the application's windows and
 then clicks on the application's dock icon.
 
+### Event: activated-with-open-windows _OS X_
+
+Emitted when the application is activated while there are open windows, which
+usually happens when clicks on the applications's dock icon.
+
 ### Event: 'browser-window-blur'
 
 Returns: