Enable WebUI ScreenLocker for aura by abstracting lock window.

chrome/browser/chromeos/login/webui_screen_locker.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/login/webui_screen_locker.h"
 
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/network_library.h"
-#include "chrome/browser/chromeos/legacy_window_manager/wm_ipc.h"
 #include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/chromeos/login/screen_locker.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/login/webui_login_display.h"
 #include "chrome/browser/ui/views/dom_view.h"
 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/url_constants.h"
 #include "content/browser/renderer_host/render_widget_host_view.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/screen.h"
-#include "ui/views/widget/native_widget_gtk.h"
-
-// These conflict with some of the Chrome headers, so must be included last.
-#include <X11/extensions/XTest.h>
-#include <X11/keysym.h>
-#include <gdk/gdkkeysyms.h>
-#include <gdk/gdkx.h>
 
 namespace {
 
 // URL which corresponds to the login WebUI.
 const char kLoginURL[] = "chrome://oobe/login";
 
-// The maximum duration for which locker should try to grab the keyboard and
-// mouse and its interval for regrabbing on failure.
-const int kMaxGrabFailureSec = 30;
-const int64 kRetryGrabIntervalMs = 500;
-
-// Maximum number of times we'll try to grab the keyboard and mouse before
-// giving up.  If we hit the limit, Chrome exits and the session is terminated.
-const int kMaxGrabFailures = kMaxGrabFailureSec * 1000 / kRetryGrabIntervalMs;
-
-// A ScreenLock window that covers entire screen to keep the keyboard
-// focus/events inside the grab widget.
-class LockWindow : public views::NativeWidgetGtk {
- public:
-  explicit LockWindow(chromeos::WebUIScreenLocker* webui_screen_locker)
-      : views::NativeWidgetGtk(new views::Widget),
-        toplevel_focus_widget_(NULL),
-        webui_screen_locker_(webui_screen_locker) {
-    EnableDoubleBuffer(true);
-  }
-
-  virtual gboolean OnButtonPress(GtkWidget* widget,
-                                 GdkEventButton* event) OVERRIDE {
-    // Never propagate mouse events to parent.
-    return true;
-  }
-
-  virtual void OnDestroy(GtkWidget* object) OVERRIDE {
-    VLOG(1) << "OnDestroy: LockWindow destroyed";
-    views::NativeWidgetGtk::OnDestroy(object);
-  }
-
-  virtual void ClearNativeFocus() OVERRIDE {
-    DCHECK(toplevel_focus_widget_);
-    gtk_widget_grab_focus(toplevel_focus_widget_);
-  }
-
-  virtual void HandleGtkGrabBroke() OVERRIDE {
-    webui_screen_locker_->HandleGtkGrabBroke();
-  }
-
-  // Sets the widget to move the focus to when clearning the native
-  // widget's focus.
-  void set_toplevel_focus_widget(GtkWidget* widget) {
-    gtk_widget_set_can_focus(widget, TRUE);
-    toplevel_focus_widget_ = widget;
-  }
-
- private:
-  // The widget we set focus to when clearning the focus on native
-  // widget.  Gdk input is grabbed in WebUIScreenLocker, and resetting the focus
-  // by using gtk_window_set_focus seems to confuse gtk and doesn't let focus
-  // move to native widget under this.
-  GtkWidget* toplevel_focus_widget_;
-
-  // The WebUI screen locker.
-  chromeos::WebUIScreenLocker* webui_screen_locker_;
-
-  DISALLOW_COPY_AND_ASSIGN(LockWindow);
-};
-
-// Define separate methods for each error code so that stack trace
-// will tell which error the grab failed with.
-void FailedWithGrabAlreadyGrabbed() {
-  LOG(FATAL) << "Grab already grabbed";
-}
-void FailedWithGrabInvalidTime() {
-  LOG(FATAL) << "Grab invalid time";
-}
-void FailedWithGrabNotViewable() {
-  LOG(FATAL) << "Grab not viewable";
-}
-void FailedWithGrabFrozen() {
-  LOG(FATAL) << "Grab frozen";
-}
-void FailedWithUnknownError() {
-  LOG(FATAL) << "Grab uknown";
-}
-
 }  // namespace
 
 namespace chromeos {
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebUIScreenLocker implementation.
 
 WebUIScreenLocker::WebUIScreenLocker(ScreenLocker* screen_locker)
     : ScreenLockerDelegate(screen_locker),
-      drawn_(false),
-      input_grabbed_(false),
-      ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
-      grab_failure_count_(0),
-      kbd_grab_status_(GDK_GRAB_INVALID_TIME),
-      mouse_grab_status_(GDK_GRAB_INVALID_TIME) {
+      lock_ready_(false),
+      webui_ready_(false) {
 }
 
 void WebUIScreenLocker::LockScreen(bool unlock_on_input) {
-  static const GdkColor kGdkBlack = {0, 0, 0, 0};
-
   gfx::Rect bounds(gfx::Screen::GetMonitorAreaNearestWindow(NULL));
 
-  LockWindow* lock_window = new LockWindow(this);
+  LockWindow* lock_window = LockWindow::Create();
+  lock_window->set_observer(this);
   lock_window_ = lock_window->GetWidget();
-  views::Widget::InitParams params(
-      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
-  params.bounds = bounds;
-  params.native_widget = lock_window;
-  lock_window_->Init(params);
-  gtk_widget_modify_bg(
-      lock_window_->GetNativeView(), GTK_STATE_NORMAL, &kGdkBlack);
-
-  g_signal_connect(lock_window_->GetNativeView(), "client-event",
-                   G_CALLBACK(OnClientEventThunk), this);
-
-  // TODO(flackr): Obscure the screen with black / a screensaver if
-  // unlock_on_input.
-  DCHECK(GTK_WIDGET_REALIZED(lock_window_->GetNativeView()));
-  WmIpc::instance()->SetWindowType(
-      lock_window_->GetNativeView(),
-      WM_IPC_WINDOW_CHROME_SCREEN_LOCKER,
-      NULL);
-
   WebUILoginView::Init(lock_window_);
   lock_window_->SetContentsView(this);
   lock_window_->Show();
   OnWindowCreated();
   LoadURL(GURL(kLoginURL));
+  lock_window->Grab(webui_login_);
+
   // User list consisting of a single logged-in user.
   UserList users(1, &chromeos::UserManager::Get()->logged_in_user());
   login_display_.reset(new WebUILoginDisplay(this));
   login_display_->set_background_bounds(bounds);
-  login_display_->set_parent_window(
-      GTK_WINDOW(lock_window_->GetNativeView()));
   login_display_->Init(users, false, false);
 
   static_cast<OobeUI*>(GetWebUI())->ShowSigninScreen(login_display_.get());
 
   registrar_.Add(this,
                  chrome::NOTIFICATION_LOGIN_USER_IMAGE_CHANGED,
                  content::NotificationService::AllSources());
-
-  ClearGtkGrab();
-
-  // Call this after lock_window_->Show(); otherwise the 1st invocation
-  // of gdk_xxx_grab() will always fail.
-  TryGrabAllInputs();
-
-  // Add the window to its own group so that its grab won't be stolen if
-  // gtk_grab_add() gets called on behalf on a non-screen-locker widget (e.g.
-  // a modal dialog) -- see http://crosbug.com/8999.  We intentionally do this
-  // after calling ClearGtkGrab(), as want to be in the default window group
-  // then so we can break any existing GTK grabs.
-  GtkWindowGroup* window_group = gtk_window_group_new();
-  gtk_window_group_add_window(window_group,
-                              GTK_WINDOW(lock_window_->GetNativeView()));
-  g_object_unref(window_group);
-
-  lock_window->set_toplevel_focus_widget(lock_window->window_contents());
-}
-
-void WebUIScreenLocker::OnGrabInputs() {
-  DVLOG(1) << "OnGrabInputs";
-  input_grabbed_ = true;
-  if (drawn_)
-    ScreenLockReady();
-}
-
-void WebUIScreenLocker::OnWindowManagerReady() {
-  DVLOG(1) << "OnClientEvent: drawn for lock";
-  drawn_ = true;
-  if (input_grabbed_)
-    ScreenLockReady();
 }
 
 void WebUIScreenLocker::ScreenLockReady() {
   ScreenLockerDelegate::ScreenLockReady();
   SetInputEnabled(true);
 }
 
-void WebUIScreenLocker::ClearGtkGrab() {
-  GtkWidget* current_grab_window;
-  // Grab gtk input first so that the menu holding gtk grab will
-  // close itself.
-  gtk_grab_add(webui_login_->native_view());
-
-  // Make sure there is no gtk grab widget so that gtk simply propagates
-  // an event.  GTK maintains grab widgets in a linked-list, so we need to
-  // remove until it's empty.
-  while ((current_grab_window = gtk_grab_get_current()) != NULL)
-    gtk_grab_remove(current_grab_window);
-}
-
-void WebUIScreenLocker::TryGrabAllInputs() {
-  // Grab on the RenderWidgetHostView hosting the WebUI login screen.
-  GdkWindow* grab_widget = webui_login_->dom_contents()->tab_contents()->
-      GetRenderWidgetHostView()->GetNativeView()->window;
-  // Grab x server so that we can atomically grab and take
-  // action when grab fails.
-  gdk_x11_grab_server();
-  gtk_grab_add(webui_login_->native_view());
-  if (kbd_grab_status_ != GDK_GRAB_SUCCESS)
-    kbd_grab_status_ = gdk_keyboard_grab(grab_widget, FALSE, GDK_CURRENT_TIME);
-  if (mouse_grab_status_ != GDK_GRAB_SUCCESS) {
-    mouse_grab_status_ =
-        gdk_pointer_grab(grab_widget,
-                         FALSE,
-                         static_cast<GdkEventMask>(
-                             GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
-                             GDK_POINTER_MOTION_MASK),
-                         NULL,
-                         NULL,
-                         GDK_CURRENT_TIME);
-  }
-  if ((kbd_grab_status_ != GDK_GRAB_SUCCESS ||
-       mouse_grab_status_ != GDK_GRAB_SUCCESS) &&
-      grab_failure_count_++ < kMaxGrabFailures) {
-    LOG(WARNING) << "Failed to grab inputs. Trying again in "
-                 << kRetryGrabIntervalMs << " ms: kbd="
-                 << kbd_grab_status_ << ", mouse=" << mouse_grab_status_;
-    TryUngrabOtherClients();
-    gdk_x11_ungrab_server();
-    MessageLoop::current()->PostDelayedTask(
-        FROM_HERE,
-        base::Bind(&WebUIScreenLocker::TryGrabAllInputs,
-                   weak_factory_.GetWeakPtr()),
-        kRetryGrabIntervalMs);
-  } else {
-    gdk_x11_ungrab_server();
-    GdkGrabStatus status = kbd_grab_status_;
-    if (status == GDK_GRAB_SUCCESS) {
-      status = mouse_grab_status_;
-    }
-    switch (status) {
-      case GDK_GRAB_SUCCESS:
-        break;
-      case GDK_GRAB_ALREADY_GRABBED:
-        FailedWithGrabAlreadyGrabbed();
-        break;
-      case GDK_GRAB_INVALID_TIME:
-        FailedWithGrabInvalidTime();
-        break;
-      case GDK_GRAB_NOT_VIEWABLE:
-        FailedWithGrabNotViewable();
-        break;
-      case GDK_GRAB_FROZEN:
-        FailedWithGrabFrozen();
-        break;
-      default:
-        FailedWithUnknownError();
-        break;
-    }
-    DVLOG(1) << "Grab Success";
-    OnGrabInputs();
-  }
-}
-
-void WebUIScreenLocker::TryUngrabOtherClients() {
-#if !defined(NDEBUG)
-  {
-    int event_base, error_base;
-    int major, minor;
-    // Make sure we have XTest extension.
-    DCHECK(XTestQueryExtension(ui::GetXDisplay(),
-                               &event_base, &error_base,
-                               &major, &minor));
-  }
-#endif
-
-  // The following code is an attempt to grab inputs by closing
-  // supposedly opened menu. This happens when a plugin has a menu
-  // opened.
-  if (mouse_grab_status_ == GDK_GRAB_ALREADY_GRABBED ||
-      mouse_grab_status_ == GDK_GRAB_FROZEN) {
-    // Successfully grabbed the keyboard, but pointer is still
-    // grabbed by other client. Another attempt to close supposedly
-    // opened menu by emulating keypress at the left top corner.
-    Display* display = ui::GetXDisplay();
-    Window root, child;
-    int root_x, root_y, win_x, winy;
-    unsigned int mask;
-    XQueryPointer(display,
-                  ui::GetX11WindowFromGtkWidget(
-                      static_cast<LockWindow*>(lock_window_->native_widget())->
-                      window_contents()),
-                  &root, &child, &root_x, &root_y,
-                  &win_x, &winy, &mask);
-    XTestFakeMotionEvent(display, -1, -10000, -10000, CurrentTime);
-    XTestFakeButtonEvent(display, 1, True, CurrentTime);
-    XTestFakeButtonEvent(display, 1, False, CurrentTime);
-    // Move the pointer back.
-    XTestFakeMotionEvent(display, -1, root_x, root_y, CurrentTime);
-    XFlush(display);
-  } else if (kbd_grab_status_ == GDK_GRAB_ALREADY_GRABBED ||
-             kbd_grab_status_ == GDK_GRAB_FROZEN) {
-    // Successfully grabbed the pointer, but keyboard is still grabbed
-    // by other client. Another attempt to close supposedly opened
-    // menu by emulating escape key.  Such situation must be very
-    // rare, but handling this just in case
-    Display* display = ui::GetXDisplay();
-    KeyCode escape = XKeysymToKeycode(display, XK_Escape);
-    XTestFakeKeyEvent(display, escape, True, CurrentTime);
-    XTestFakeKeyEvent(display, escape, False, CurrentTime);
-    XFlush(display);
-  }
-}
-
-void WebUIScreenLocker::HandleGtkGrabBroke() {
-  // Input should never be stolen from ScreenLocker once it's
-  // grabbed.  If this happens, it's a bug and has to be fixed. We
-  // let chrome crash to get a crash report and dump, and
-  // SessionManager will terminate the session to logout.
-  CHECK_NE(GDK_GRAB_SUCCESS, kbd_grab_status_);
-  CHECK_NE(GDK_GRAB_SUCCESS, mouse_grab_status_);
-}
-
 void WebUIScreenLocker::OnAuthenticate() {
 }
 
 void WebUIScreenLocker::SetInputEnabled(bool enabled) {
   login_display_->SetUIEnabled(enabled);
   SetStatusAreaEnabled(enabled);
 }
 
 void WebUIScreenLocker::SetSignoutEnabled(bool enabled) {
   // TODO(flackr): Implement (crbug.com/105267).
@@ skipping 23 matching lines @@
 
 void WebUIScreenLocker::ClearErrors() {
   GetWebUI()->CallJavascriptFunction("cr.ui.Oobe.clearErrors");
 }
 
 WebUIScreenLocker::~WebUIScreenLocker() {
   DCHECK(lock_window_);
   lock_window_->Close();
 }
 
-void WebUIScreenLocker::OnClientEvent(GtkWidget* widge, GdkEventClient* event) {
-  WmIpc::Message msg;
-  WmIpc::instance()->DecodeMessage(*event, &msg);
-  if (msg.type() == WM_IPC_MESSAGE_CHROME_NOTIFY_SCREEN_REDRAWN_FOR_LOCK)
-    OnWindowManagerReady();
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // WebUIScreenLocker, content::NotificationObserver implementation:
 
 void WebUIScreenLocker::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   if (type != chrome::NOTIFICATION_LOGIN_USER_IMAGE_CHANGED)
     return;
 
@@ skipping 33 matching lines @@
   NOTREACHED();
 }
 
 void WebUIScreenLocker::OnUserSelected(const std::string& username) {
 }
 
 void WebUIScreenLocker::OnStartEnterpriseEnrollment() {
   NOTREACHED();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// LockWindow::Observer implementation:
+
+void WebUIScreenLocker::OnLockWindowReady() {
+  lock_ready_ = true;
+  if (webui_ready_)
+    ScreenLockReady();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Overridden from WebUILoginView:
+
+void WebUIScreenLocker::OnTabMainFrameFirstRender() {
+  WebUILoginView::OnTabMainFrameFirstRender();
+  webui_ready_ = true;
+  if (lock_ready_)
+    ScreenLockReady();
+}
+
 }  // namespace chromeos