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// 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/ui/gtk/gconf_titlebar_listener.h"
#include <gtk/gtk.h>
#include "base/environment.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/nix/xdg_util.h"
#include "chrome/browser/ui/gtk/browser_titlebar.h"
#include "ui/base/x/x11_util.h"
namespace {
// The GConf key we read for the button placement string. Even through the key
// has "metacity" in it, it's shared between metacity and compiz.
const char* kButtonLayoutKey = "/apps/metacity/general/button_layout";
// GConf requires us to subscribe to a parent directory before we can subscribe
// to changes in an individual key in that directory.
const char* kMetacityGeneral = "/apps/metacity/general";
} // namespace
// Public interface:
// static
GConfTitlebarListener* GConfTitlebarListener::GetInstance() {
return Singleton<GConfTitlebarListener>::get();
}
void GConfTitlebarListener::SetTitlebarButtons(BrowserTitlebar* titlebar) {
if (client_) {
titlebar->BuildButtons(current_value_);
titlebars_.insert(titlebar);
} else {
titlebar->BuildButtons(BrowserTitlebar::kDefaultButtonString);
}
}
void GConfTitlebarListener::RemoveObserver(BrowserTitlebar* titlebar) {
titlebars_.erase(titlebar);
}
// Protected:
GConfTitlebarListener::~GConfTitlebarListener() {}
// Private:
GConfTitlebarListener::GConfTitlebarListener() : client_(NULL) {
scoped_ptr<base::Environment> env(base::Environment::Create());
base::nix::DesktopEnvironment de =
base::nix::GetDesktopEnvironment(env.get());
if (de == base::nix::DESKTOP_ENVIRONMENT_GNOME ||
de == base::nix::DESKTOP_ENVIRONMENT_UNITY ||
ui::GuessWindowManager() == ui::WM_METACITY) {
client_ = gconf_client_get_default();
// If we fail to get a context, that's OK, since we'll just fallback on
// not receiving gconf keys.
if (client_) {
// Get the initial value of the key.
GError* error = NULL;
GConfValue* gconf_value = gconf_client_get(client_, kButtonLayoutKey,
&error);
if (HandleGError(error, kButtonLayoutKey))
return;
ParseAndStoreValue(gconf_value);
if (gconf_value)
gconf_value_free(gconf_value);
// Register that we're interested in the values of this directory.
gconf_client_add_dir(client_, kMetacityGeneral,
GCONF_CLIENT_PRELOAD_ONELEVEL, &error);
if (HandleGError(error, kMetacityGeneral))
return;
// Register to get notifies about changes to this key.
gconf_client_notify_add(
client_, kButtonLayoutKey,
reinterpret_cast<void (*)(GConfClient*, guint, GConfEntry*, void*)>(
OnChangeNotificationThunk),
this, NULL, &error);
if (HandleGError(error, kButtonLayoutKey))
return;
}
}
}
void GConfTitlebarListener::OnChangeNotification(GConfClient* client,
guint cnxn_id,
GConfEntry* entry) {
if (strcmp(gconf_entry_get_key(entry), kButtonLayoutKey) == 0) {
GConfValue* gconf_value = gconf_entry_get_value(entry);
ParseAndStoreValue(gconf_value);
// Broadcast the new configuration to all windows:
for (std::set<BrowserTitlebar*>::const_iterator it = titlebars_.begin();
it != titlebars_.end(); ++it) {
(*it)->BuildButtons(current_value_);
}
}
}
bool GConfTitlebarListener::HandleGError(GError* error, const char* key) {
if (error != NULL) {
LOG(ERROR) << "Error with gconf key '" << key << "': " << error->message;
g_error_free(error);
g_object_unref(client_);
client_ = NULL;
return true;
}
return false;
}
void GConfTitlebarListener::ParseAndStoreValue(GConfValue* gconf_value) {
if (gconf_value) {
const char* value = gconf_value_get_string(gconf_value);
current_value_ = value ? value : BrowserTitlebar::kDefaultButtonString;
} else {
current_value_ = BrowserTitlebar::kDefaultButtonString;
}
}
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