linux_aura: Implement the static part of the dbus menu for Unity.

chrome/browser/ui/views/frame/global_menu_bar_registrar_x11.cc

+// Copyright 2013 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/ui/views/frame/global_menu_bar_registrar_x11.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "chrome/browser/ui/views/frame/global_menu_bar_x11.h"
+#include "content/public/browser/browser_thread.h"
+
+using content::BrowserThread;
+
+namespace {
+
+const char kAppMenuRegistrarName[] = "com.canonical.AppMenu.Registrar";
+const char kAppMenuRegistrarPath[] = "/com/canonical/AppMenu/Registrar";
+
+}  // namespace
+
+// static
+GlobalMenuBarRegistrarX11* GlobalMenuBarRegistrarX11::GetInstance() {
+  return Singleton<GlobalMenuBarRegistrarX11>::get();
+}
+
+void GlobalMenuBarRegistrarX11::OnWindowMapped(unsigned long xid) {
+  live_xids_.insert(xid);
+
+  if (registrar_proxy_)
+    RegisterXID(xid);
+}
+
+void GlobalMenuBarRegistrarX11::OnWindowUnmapped(unsigned long xid) {
+  if (registrar_proxy_)
+    UnregisterXID(xid);
+
+  live_xids_.erase(xid);
+}
+
+GlobalMenuBarRegistrarX11::GlobalMenuBarRegistrarX11()
+    : registrar_proxy_(NULL) {
+  // libdbusmenu uses the gio version of dbus; I tried using the code in dbus/,
+  // but it looks like that's isn't sharing the bus name with the gio version,
+  // even when |connection_type| is set to SHARED.
+  g_dbus_proxy_new_for_bus(
+      G_BUS_TYPE_SESSION,
+      static_cast<GDBusProxyFlags>(
+          G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES |
+          G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS |
+          G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START),
+      NULL,
+      kAppMenuRegistrarName,
+      kAppMenuRegistrarPath,
+      kAppMenuRegistrarName,
+      NULL,  // TODO: Probalby want a real cancelable.
+      static_cast<GAsyncReadyCallback>(OnProxyCreatedThunk),
+      this);
+}
+
+GlobalMenuBarRegistrarX11::~GlobalMenuBarRegistrarX11() {
+  if (registrar_proxy_) {
+    g_signal_handlers_disconnect_by_func(
+        registrar_proxy_,
+        reinterpret_cast<void*>(OnNameOwnerChangedThunk),
+        this);
+    g_object_unref(registrar_proxy_);
+  }
+}
+
+void GlobalMenuBarRegistrarX11::RegisterXID(unsigned long xid) {
+  DCHECK(registrar_proxy_);
+  std::string path = GlobalMenuBarX11::GetPathForWindow(xid);
+
+  // TODO(erg): The mozilla implementation goes to a lot of callback trouble
+  // just to make sure that they react to make sure there's some sort of
+  // cancelable object; including making a whole callback just to handle the
+  // cancelable.
+  //
+  // I don't see any reason why we should care if "RegisterWindow" completes or
+  // not.
+  g_dbus_proxy_call(registrar_proxy_,
+                    "RegisterWindow",
+                    g_variant_new("(uo)", xid, path.c_str()),
+                    G_DBUS_CALL_FLAGS_NONE, -1,
+                    NULL,
+                    NULL,
+                    NULL);
+}
+
+void GlobalMenuBarRegistrarX11::UnregisterXID(unsigned long xid) {
+  DCHECK(registrar_proxy_);
+  std::string path = GlobalMenuBarX11::GetPathForWindow(xid);
+
+  // TODO(erg): The mozilla implementation goes to a lot of callback trouble
+  // just to make sure that they react to make sure there's some sort of
+  // cancelable object; including making a whole callback just to handle the
+  // cancelable.
+  //
+  // I don't see any reason why we should care if "UnregisterWindow" completes
+  // or not.
+  g_dbus_proxy_call(registrar_proxy_,
+                    "UnregisterWindow",
+                    g_variant_new("(u)", xid),
+                    G_DBUS_CALL_FLAGS_NONE, -1,
+                    NULL,
+                    NULL,
+                    NULL);
+}
+
+void GlobalMenuBarRegistrarX11::OnProxyCreated(GObject* source,
+                                               GAsyncResult* result) {
+  GError* error = NULL;
+  GDBusProxy* proxy = g_dbus_proxy_new_for_bus_finish(result, &error);
+  if (error) {
+    g_error_free(error);
+    return;
+  }
+
+  // TODO(erg): Mozilla's implementation has a workaround for GDBus
+  // cancellation here. However, it's marked as fixed. If there's weird
+  // problems with cancelation, look at how they fixed their issues.
+
+  registrar_proxy_ = proxy;
+
+  g_signal_connect(registrar_proxy_, "notify::g-name-owner",
+                   G_CALLBACK(OnNameOwnerChangedThunk), this);
+
+  OnNameOwnerChanged(NULL, NULL);
+}
+
+void GlobalMenuBarRegistrarX11::OnNameOwnerChanged(GObject* /* ignored */,
+                                                   GParamSpec* /* ignored */) {
+  // If the name owner changed, we need to reregister all the live xids with
+  // the system.
+  for (std::set<unsigned long>::const_iterator it = live_xids_.begin();
+       it != live_xids_.end(); ++it) {
+    RegisterXID(*it);
+  }
+}