Windows: Use WS_EX_NOACTIVATE to control initial window activation (issue #1856)

libcef/browser/native/browser_platform_delegate_native_win.cc

@@ -207,8 +207,27 @@ bool CefBrowserPlatformDelegateNativeWin::CreateHostWindow() {
                       gfx::Rect(0, 0, point.x(), point.y()));
 
   window_widget_ = delegate_view->GetWidget();
+
+  const HWND widget_hwnd = HWNDForWidget(window_widget_);
+  DCHECK(widget_hwnd);
+  const DWORD widget_ex_styles = GetWindowLongPtr(widget_hwnd, GWL_EXSTYLE);
+
+  if (window_info_.ex_style & WS_EX_NOACTIVATE) {
+    // Add the WS_EX_NOACTIVATE style on the DesktopWindowTreeHostWin HWND
+    // so that HWNDMessageHandler::Show() called via Widget::Show() does not
+    // activate the window.
+    SetWindowLongPtr(widget_hwnd, GWL_EXSTYLE,
+                     widget_ex_styles | WS_EX_NOACTIVATE);
+  }
+
   window_widget_->Show();
 
+  if (window_info_.ex_style & WS_EX_NOACTIVATE) {
+    // Remove the WS_EX_NOACTIVATE style so that future mouse clicks inside the
+    // browser correctly activate and focus the window.
+    SetWindowLongPtr(widget_hwnd, GWL_EXSTYLE, widget_ex_styles);
+  }
+
   return true;
 }
 

tests/cefclient/browser/browser_window_osr_win.cc

@@ -41,6 +41,9 @@ void BrowserWindowOsrWin::GetPopupConfig(CefWindowHandle temp_handle,
   windowInfo.external_begin_frame_enabled =
       osr_window_->settings().external_begin_frame_enabled;
 
+  // Don't activate the hidden browser on creation.
+  windowInfo.ex_style |= WS_EX_NOACTIVATE;
+
   client = client_handler_;
 }
 

tests/cefclient/browser/browser_window_std_win.cc

@@ -26,6 +26,11 @@ void BrowserWindowStdWin::CreateBrowser(
   RECT wnd_rect = {rect.x, rect.y, rect.x + rect.width, rect.y + rect.height};
   window_info.SetAsChild(parent_handle, wnd_rect);
 
+  if (GetWindowLongPtr(parent_handle, GWL_EXSTYLE) & WS_EX_NOACTIVATE) {
+    // Don't activate the browser window on creation.
+    window_info.ex_style |= WS_EX_NOACTIVATE;
+  }
+
   CefBrowserHost::CreateBrowser(window_info, client_handler_,
                                 client_handler_->startup_url(), settings,
                                 request_context);
@@ -39,6 +44,10 @@ void BrowserWindowStdWin::GetPopupConfig(CefWindowHandle temp_handle,
 
   // The window will be properly sized after the browser is created.
   windowInfo.SetAsChild(temp_handle, RECT());
+
+  // Don't activate the hidden browser window on creation.
+  windowInfo.ex_style |= WS_EX_NOACTIVATE;
+
   client = client_handler_;
 }
 
@@ -53,8 +62,11 @@ void BrowserWindowStdWin::ShowPopup(ClientWindowHandle parent_handle,
   if (hwnd) {
     SetParent(hwnd, parent_handle);
     SetWindowPos(hwnd, NULL, x, y, static_cast<int>(width),
-                 static_cast<int>(height), SWP_NOZORDER);
-    ShowWindow(hwnd, SW_SHOW);
+                 static_cast<int>(height), SWP_NOZORDER | SWP_NOACTIVATE);
+
+    const bool no_activate =
+        GetWindowLongPtr(parent_handle, GWL_EXSTYLE) & WS_EX_NOACTIVATE;
+    ShowWindow(hwnd, no_activate ? SW_SHOWNOACTIVATE : SW_SHOW);
   }
 }
 

tests/cefclient/browser/client_handler.cc

@@ -249,7 +249,8 @@ ClientHandler::ClientHandler(Delegate* delegate,
       browser_count_(0),
       console_log_file_(MainContext::Get()->GetConsoleLogPath()),
       first_console_message_(true),
-      focus_on_editable_field_(false) {
+      focus_on_editable_field_(false),
+      initial_navigation_(true) {
   DCHECK(!console_log_file_.empty());
 
 #if defined(OS_LINUX)
@@ -497,6 +498,22 @@ void ClientHandler::OnTakeFocus(CefRefPtr<CefBrowser> browser, bool next) {
   NotifyTakeFocus(next);
 }
 
+bool ClientHandler::OnSetFocus(CefRefPtr<CefBrowser> browser,
+                               FocusSource source) {
+  CEF_REQUIRE_UI_THREAD();
+
+  if (initial_navigation_) {
+    CefRefPtr<CefCommandLine> command_line =
+        CefCommandLine::GetGlobalCommandLine();
+    if (command_line->HasSwitch(switches::kNoActivate)) {
+      // Don't give focus to the browser on creation.
+      return true;
+    }
+  }
+
+  return false;
+}
+
 bool ClientHandler::OnPreKeyEvent(CefRefPtr<CefBrowser> browser,
                                   const CefKeyEvent& event,
                                   CefEventHandle os_event,
@@ -606,6 +623,10 @@ void ClientHandler::OnLoadingStateChange(CefRefPtr<CefBrowser> browser,
                                          bool canGoForward) {
   CEF_REQUIRE_UI_THREAD();
 
+  if (!isLoading && initial_navigation_) {
+    initial_navigation_ = false;
+  }
+
   NotifyLoadingState(isLoading, canGoBack, canGoForward);
 }
 

tests/cefclient/browser/client_handler.h

@@ -169,6 +169,7 @@ class ClientHandler : public CefClient,
 
   // CefFocusHandler methods
   void OnTakeFocus(CefRefPtr<CefBrowser> browser, bool next) OVERRIDE;
+  bool OnSetFocus(CefRefPtr<CefBrowser> browser, FocusSource source) OVERRIDE;
 
   // CefKeyboardHandler methods
   bool OnPreKeyEvent(CefRefPtr<CefBrowser> browser,
@@ -370,6 +371,9 @@ class ClientHandler : public CefClient,
   // True if an editable field currently has focus.
   bool focus_on_editable_field_;
 
+  // True for the initial navigation after browser creation.
+  bool initial_navigation_;
+
   // Set of Handlers registered with the message router.
   MessageHandlerSet message_handler_set_;
 

tests/cefclient/browser/osr_window_win.cc

@@ -76,6 +76,11 @@ void OsrWindowWin::CreateBrowser(HWND parent_hwnd,
   CefWindowInfo window_info;
   window_info.SetAsWindowless(hwnd_);
 
+  if (GetWindowLongPtr(parent_hwnd, GWL_EXSTYLE) & WS_EX_NOACTIVATE) {
+    // Don't activate the browser window on creation.
+    window_info.ex_style |= WS_EX_NOACTIVATE;
+  }
+
   window_info.shared_texture_enabled = settings_.shared_texture_enabled;
   window_info.external_begin_frame_enabled =
       settings_.external_begin_frame_enabled;
@@ -220,10 +225,16 @@ void OsrWindowWin::Create(HWND parent_hwnd, const RECT& rect) {
 
   RegisterOsrClass(hInst, background_brush);
 
+  DWORD ex_style = 0;
+  if (GetWindowLongPtr(parent_hwnd, GWL_EXSTYLE) & WS_EX_NOACTIVATE) {
+    // Don't activate the browser window on creation.
+    ex_style |= WS_EX_NOACTIVATE;
+  }
+
   // Create the native window with a border so it's easier to visually identify
   // OSR windows.
-  hwnd_ = ::CreateWindow(
-      kWndClass, 0,
+  hwnd_ = ::CreateWindowEx(
+      ex_style, kWndClass, 0,
       WS_BORDER | WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS | WS_VISIBLE,
       rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,
       parent_hwnd, 0, hInst, 0);

tests/cefclient/browser/root_window.h

@@ -150,6 +150,7 @@ class RootWindow
     ShowNormal,
     ShowMinimized,
     ShowMaximized,
+    ShowNoActivate,
   };
 
   // Show the window.

tests/cefclient/browser/root_window_win.cc

@@ -226,6 +226,9 @@ void RootWindowWin::Show(ShowMode mode) {
     case ShowMaximized:
       nCmdShow = SW_SHOWMAXIMIZED;
       break;
+    case ShowNoActivate:
+      nCmdShow = SW_SHOWNOACTIVATE;
+      break;
     default:
       break;
   }
@@ -334,8 +337,16 @@ void RootWindowWin::CreateRootWindow(const CefBrowserSettings& settings,
   find_message_id_ = RegisterWindowMessage(FINDMSGSTRING);
   CHECK(find_message_id_);
 
+  CefRefPtr<CefCommandLine> command_line =
+      CefCommandLine::GetGlobalCommandLine();
+  const bool no_activate = command_line->HasSwitch(switches::kNoActivate);
+
   const DWORD dwStyle = WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN;
-  const DWORD dwExStyle = always_on_top_ ? WS_EX_TOPMOST : 0;
+  DWORD dwExStyle = always_on_top_ ? WS_EX_TOPMOST : 0;
+  if (no_activate) {
+    // Don't activate the browser window on creation.
+    dwExStyle |= WS_EX_NOACTIVATE;
+  }
 
   int x, y, width, height;
   if (::IsRectEmpty(&start_rect_)) {
@@ -373,7 +384,7 @@ void RootWindowWin::CreateRootWindow(const CefBrowserSettings& settings,
 
   if (!initially_hidden) {
     // Show this window.
-    Show(ShowNormal);
+    Show(no_activate ? ShowNoActivate : ShowNormal);
   }
 }
 
@@ -1069,6 +1080,22 @@ void RootWindowWin::OnSetLoadingState(bool isLoading,
     EnableWindow(stop_hwnd_, isLoading);
     EnableWindow(edit_hwnd_, TRUE);
   }
+
+  if (!isLoading && GetWindowLongPtr(hwnd_, GWL_EXSTYLE) & WS_EX_NOACTIVATE) {
+    // Done with the initial navigation. Remove the WS_EX_NOACTIVATE style so
+    // that future mouse clicks inside the browser correctly activate and focus
+    // the window. For the top-level window removing this style causes Windows
+    // to display the task bar button.
+    SetWindowLongPtr(hwnd_, GWL_EXSTYLE,
+                     GetWindowLongPtr(hwnd_, GWL_EXSTYLE) & ~WS_EX_NOACTIVATE);
+
+    if (browser_window_) {
+      HWND browser_hwnd = browser_window_->GetWindowHandle();
+      SetWindowLongPtr(
+          browser_hwnd, GWL_EXSTYLE,
+          GetWindowLongPtr(browser_hwnd, GWL_EXSTYLE) & ~WS_EX_NOACTIVATE);
+    }
+  }
 }
 
 namespace {

tests/shared/common/client_switches.cc

@@ -43,6 +43,7 @@ const char kWidevineCdmPath[] = "widevine-cdm-path";
 const char kSslClientCertificate[] = "ssl-client-certificate";
 const char kCRLSetsPath[] = "crl-sets-path";
 const char kLoadExtension[] = "load-extension";
+const char kNoActivate[] = "no-activate";
 
 }  // namespace switches
 }  // namespace client

tests/shared/common/client_switches.h

@@ -37,6 +37,7 @@ extern const char kWidevineCdmPath[];
 extern const char kSslClientCertificate[];
 extern const char kCRLSetsPath[];
 extern const char kLoadExtension[];
+extern const char kNoActivate[];
 
 }  // namespace switches
 }  // namespace client