Support chrome.windows extension API events for browserless Panels.

chrome/browser/extensions/extension_panel_event_router.cc

+// Copyright (c) 2012 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/extensions/extension_panel_event_router.h"
+
+#include "base/json/json_writer.h"
+#include "base/values.h"
+#include "chrome/browser/extensions/extension_event_names.h"
+#include "chrome/browser/extensions/extension_event_router.h"
+#include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/extensions/extension_window_controller.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/panels/panel.h"
+#include "chrome/common/extensions/extension_constants.h"
+
+namespace events = extension_event_names;

[stevenjb, 2012/07/20 16:54:33]

Ideally, extension_event_names should be extension::event_names, and this should
be in the extensions namespace, so we wouldn't need this. For now, I'd at least
use event_names since that ebtter describes the namespace (I got confused about
what, for example, kOnWindowCreated was).

+
+ExtensionPanelEventRouter::ExtensionPanelEventRouter(Profile* profile)
+    : profile_(profile),
+      focused_profile_(NULL),
+      focused_window_id_(extension_misc::kUnknownWindowId) {
+}
+
+ExtensionPanelEventRouter::~ExtensionPanelEventRouter() {
+}
+
+void ExtensionPanelEventRouter::OnPanelOpened(Panel* panel) {
+  if (!profile_->IsSameProfile(panel->profile()))
+    return;
+
+  base::ListValue args;
+  DCHECK(panel->extension_window_controller());
+  DictionaryValue* window_dictionary =
+      panel->extension_window_controller()->CreateWindowValue();
+  args.Append(window_dictionary);
+  DispatchEvent(events::kOnWindowCreated, panel->profile(), &args);
+}
+
+void ExtensionPanelEventRouter::OnPanelActiveStatusChanged(
+    Panel* panel, bool is_active_now) {
+  Profile* window_profile = NULL;
+  int window_id = extension_misc::kUnknownWindowId;
+  if (is_active_now && profile_->IsSameProfile(panel->profile())) {
+    window_profile = panel->profile();
+    window_id = panel->extension_window_controller()->GetWindowId();
+  }
+
+  if (focused_window_id_ == window_id)
+    return;
+
+  // window_profile is either this panel's profile's default profile, its

[stevenjb, 2012/07/20 16:54:33]

nit: "the panel profile's" or "the default profile for this panel's profile"
would be easier to read

+  // incognito profile, or NULL iff this profile is losing focus.
+  Profile* previous_focused_profile = focused_profile_;
+  focused_profile_ = window_profile;
+  focused_window_id_ = window_id;

[stevenjb, 2012/07/20 16:54:33]

Couldn't window_id still be kUnknownWindowId at this point? Is that valid?

[jennb, 2012/07/20 18:09:37]

Yes, that's valid and expected when the current focused window loses focus.

+
+  base::ListValue real_args;
+  real_args.Append(Value::CreateIntegerValue(window_id));
+  std::string real_json_args;
+  base::JSONWriter::Write(&real_args, &real_json_args);
+
+  // When switching between windows in the default and incognito profiles,
+  // dispatch WINDOW_ID_NONE to extensions whose profile lost focus that
+  // can't see the new focused window across the incognito boundary.
+  // See crbug.com/46610.
+  std::string none_json_args;
+  if (focused_profile_ != NULL && previous_focused_profile != NULL &&
+      focused_profile_ != previous_focused_profile) {
+    base::ListValue none_args;
+    none_args.Append(
+        Value::CreateIntegerValue(extension_misc::kUnknownWindowId));
+    base::JSONWriter::Write(&none_args, &none_json_args);
+  }
+
+  if (!window_profile)
+    window_profile = previous_focused_profile;
+
+  extensions::ExtensionSystem::Get(window_profile)->event_router()->
+      DispatchEventsToRenderersAcrossIncognito(events::kOnWindowFocusedChanged,
+                                               real_json_args,
+                                               window_profile,
+                                               none_json_args,
+                                               GURL());
+}
+
+void ExtensionPanelEventRouter::OnPanelClosed(Panel* panel) {
+  if (!profile_->IsSameProfile(panel->profile()))
+    return;
+
+  int window_id = panel->extension_window_controller()->GetWindowId();
+  base::ListValue args;
+  args.Append(Value::CreateIntegerValue(window_id));
+  DispatchEvent(events::kOnWindowRemoved, panel->profile(), &args);
+}
+
+void ExtensionPanelEventRouter::DispatchEvent(const char* event_name,
+                                              Profile* profile,
+                                              base::ListValue* args) {
+  std::string json_args;
+  base::JSONWriter::Write(args, &json_args);
+  extensions::ExtensionSystem::Get(profile)->event_router()->
+      DispatchEventToRenderers(event_name, json_args, profile, GURL());
+}