2 files changed, 25 insertions, 0 deletions
diff --git a/win8/metro_driver/chrome_app_view_ash.cc b/win8/metro_driver/chrome_app_view_ash.cc
index e9a9363..2214185 100644
--- a/win8/metro_driver/chrome_app_view_ash.cc
+++ b/win8/metro_driver/chrome_app_view_ash.cc
@@ -40,6 +40,10 @@ typedef winfoundtn::ITypedEventHandler<
     winui::Core::CoreWindow*,
     winui::Core::CharacterReceivedEventArgs*> CharEventHandler;
 
+typedef winfoundtn::ITypedEventHandler<
+    winui::Core::CoreWindow*,
+    winui::Core::VisibilityChangedEventArgs*> VisibilityChangedHandler;
+
 // This function is exported by chrome.exe.
 typedef int (__cdecl *BreakpadExceptionHandler)(EXCEPTION_POINTERS* info);
 
@@ -283,6 +287,11 @@ ChromeAppViewAsh::SetWindow(winui::Core::ICoreWindow* window) {
       &character_received_token_);
   CheckHR(hr);
 
+  hr = window_->add_VisibilityChanged(mswr::Callback<VisibilityChangedHandler>(
+      this, &ChromeAppViewAsh::OnVisibilityChanged).Get(),
+      &visibility_changed_token_);
+  CheckHR(hr);
+
   // By initializing the direct 3D swap chain with the corewindow
   // we can now directly blit to it from the browser process.
   direct3d_helper_.Initialize(window);
@@ -488,6 +497,18 @@ HRESULT ChromeAppViewAsh::OnCharacterReceived(
   return S_OK;
 }
 
+HRESULT ChromeAppViewAsh::OnVisibilityChanged(
+    winui::Core::ICoreWindow* sender,
+    winui::Core::IVisibilityChangedEventArgs* args) {
+  boolean visible = false;
+  HRESULT hr = args->get_Visible(&visible);
+  if (FAILED(hr))
+    return hr;
+
+  ui_channel_->Send(new MetroViewerHostMsg_VisibilityChanged(!!visible));
+  return S_OK;
+}
+
 
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/win8/metro_driver/chrome_app_view_ash.h b/win8/metro_driver/chrome_app_view_ash.h
index 886510c..1906297 100644
--- a/win8/metro_driver/chrome_app_view_ash.h
+++ b/win8/metro_driver/chrome_app_view_ash.h
@@ -56,6 +56,9 @@ class ChromeAppViewAsh
   HRESULT OnCharacterReceived(winui::Core::ICoreWindow* sender,
                               winui::Core::ICharacterReceivedEventArgs* args);
 
+  HRESULT OnVisibilityChanged(winui::Core::ICoreWindow* sender,
+                              winui::Core::IVisibilityChangedEventArgs* args);
+
   mswr::ComPtr<winui::Core::ICoreWindow> window_;
   mswr::ComPtr<winapp::Core::ICoreApplicationView> view_;
   EventRegistrationToken activated_token_;
@@ -66,6 +69,7 @@ class ChromeAppViewAsh
   EventRegistrationToken keydown_token_;
   EventRegistrationToken keyup_token_;
   EventRegistrationToken character_received_token_;
+  EventRegistrationToken visibility_changed_token_;
 
   metro_driver::Direct3DHelper direct3d_helper_;