Add NativeWindowObserver::OnCloseButtonClicked

atom/browser/api/atom_api_browser_window.cc

@@ -243,6 +243,14 @@ void BrowserWindow::WillDestroyNativeObject() {
   }
 }
 
+void BrowserWindow::OnCloseButtonClicked(bool* prevent_default) {
+  // When user tries to close the window by clicking the close button, we do
+  // not close the window immediately, instead we try to close the web page
+  // first, and when the web page is closed the window will also be closed.
+  *prevent_default = true;
+  window_->RequestToClosePage();
+}
+
 void BrowserWindow::OnWindowClosed() {
   api_web_contents_->DestroyWebContents(true /* async */);
 

atom/browser/api/atom_api_browser_window.h

@@ -71,6 +71,7 @@ class BrowserWindow : public mate::TrackableObject<BrowserWindow>,
   // NativeWindowObserver:
   void WillCloseWindow(bool* prevent_default) override;
   void WillDestroyNativeObject() override;
+  void OnCloseButtonClicked(bool* prevent_default) override;
   void OnWindowClosed() override;
   void OnWindowEndSession() override;
   void OnWindowBlur() override;

atom/browser/native_window.cc

@@ -427,14 +427,6 @@ void NativeWindow::CloseFilePreview() {
 }
 
 void NativeWindow::RequestToClosePage() {
-  bool prevent_default = false;
-  for (NativeWindowObserver& observer : observers_)
-    observer.WillCloseWindow(&prevent_default);
-  if (prevent_default) {
-    WindowList::WindowCloseCancelled(this);
-    return;
-  }
-
   // Assume the window is not responding if it doesn't cancel the close and is
   // not closed in 5s, in this way we can quickly show the unresponsive
   // dialog when the window is busy executing some script withouth waiting for
@@ -480,6 +472,25 @@ void NativeWindow::RendererResponsive(content::WebContents* source) {
     observer.OnWindowResponsive();
 }
 
+void NativeWindow::NotifyWindowCloseButtonClicked() {
+  // First ask the observers whether we want to close.
+  bool prevent_default = false;
+  for (NativeWindowObserver& observer : observers_)
+    observer.WillCloseWindow(&prevent_default);
+  if (prevent_default) {
+    WindowList::WindowCloseCancelled(this);
+    return;
+  }
+
+  // Then ask the observers how should we close the window.
+  for (NativeWindowObserver& observer : observers_)
+    observer.OnCloseButtonClicked(&prevent_default);
+  if (prevent_default)
+    return;
+
+  CloseImmediately();
+}
+
 void NativeWindow::NotifyWindowClosed() {
   if (is_closed_)
     return;

atom/browser/native_window.h

@@ -249,6 +249,7 @@ class NativeWindow : public base::SupportsUserData,
 
   // Public API used by platform-dependent delegates and observers to send UI
   // related notifications.
+  void NotifyWindowCloseButtonClicked();
   void NotifyWindowClosed();
   void NotifyWindowEndSession();
   void NotifyWindowBlur();

atom/browser/native_window_mac.mm

@@ -415,10 +415,7 @@ bool ScopedDisableResize::disable_resize_ = false;
 }
 
 - (BOOL)windowShouldClose:(id)window {
-  // When user tries to close the window by clicking the close button, we do
-  // not close the window immediately, instead we try to close the web page
-  // first, and when the web page is closed the window will also be closed.
-  shell_->RequestToClosePage();
+  shell_->NotifyWindowCloseButtonClicked();
   return NO;
 }
 

atom/browser/native_window_observer.h

@@ -37,6 +37,9 @@ class NativeWindowObserver {
   // Called before the native window object is going to be destroyed.
   virtual void WillDestroyNativeObject() {}
 
+  // Called when closed button is clicked.
+  virtual void OnCloseButtonClicked(bool* prevent_default) {}
+
   // Called when the window is closed.
   virtual void OnWindowClosed() {}
 

atom/browser/native_window_views.cc

@@ -124,7 +124,8 @@ class NativeWindowClientView : public views::ClientView {
   virtual ~NativeWindowClientView() {}
 
   bool CanClose() override {
-    static_cast<NativeWindowViews*>(contents_view())->RequestToClosePage();
+    static_cast<NativeWindowViews*>(contents_view())->
+        NotifyWindowCloseButtonClicked();
     return false;
   }