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// Copyright (c) 2010 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/sync/glue/theme_change_processor.h"
#include "base/logging.h"
#include "chrome/browser/browser_theme_provider.h"
#include "chrome/browser/profile.h"
#include "chrome/browser/sync/engine/syncapi.h"
#include "chrome/browser/sync/glue/theme_util.h"
#include "chrome/browser/sync/protocol/theme_specifics.pb.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/notification_details.h"
#include "chrome/common/notification_source.h"
namespace browser_sync {
namespace {
std::string GetThemeId(Extension* current_theme) {
if (current_theme) {
DCHECK(current_theme->is_theme());
}
return current_theme ? current_theme->id() : "default/system";
}
} // namespace
ThemeChangeProcessor::ThemeChangeProcessor(
UnrecoverableErrorHandler* error_handler)
: ChangeProcessor(error_handler),
profile_(NULL) {
DCHECK(error_handler);
}
ThemeChangeProcessor::~ThemeChangeProcessor() {}
void ThemeChangeProcessor::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(running());
DCHECK(profile_);
Extension* extension = Details<Extension>(details).ptr();
std::string current_or_future_theme_id =
profile_->GetThemeProvider()->GetThemeID();
Extension* current_theme = profile_->GetTheme();
switch (type.value) {
case NotificationType::BROWSER_THEME_CHANGED:
// We pay attention to this notification only when it signifies
// that a user changed the theme to the default/system theme, or
// when it signifies that a user changed the theme to a custom
// one that was already installed. Otherwise, current_theme
// still points to the previous theme until it gets installed
// and loaded (and we get an EXTENSION_LOADED notification).
LOG(INFO) << "Got BROWSER_THEME_CHANGED notification for theme "
<< GetThemeId(extension);
DCHECK_EQ(Source<BrowserThemeProvider>(source).ptr(),
profile_->GetThemeProvider());
if (extension != NULL) {
DCHECK(extension->is_theme());
DCHECK_EQ(extension->id(), current_or_future_theme_id);
if (!current_theme || (current_theme->id() != extension->id())) {
return;
}
}
break;
case NotificationType::EXTENSION_LOADED:
// We pay attention to this notification only when it signifies
// that a theme extension has been loaded because that means
// that the user set the current theme to a custom theme that
// needed to be downloaded and installed and that it was
// installed successfully.
DCHECK_EQ(Source<Profile>(source).ptr(), profile_);
CHECK(extension);
if (!extension->is_theme()) {
return;
}
LOG(INFO) << "Got EXTENSION_LOADED notification for theme "
<< extension->id();
DCHECK_EQ(extension->id(), current_or_future_theme_id);
DCHECK_EQ(extension, current_theme);
break;
case NotificationType::EXTENSION_UNLOADED:
// We pay attention to this notification only when it signifies
// that a theme extension has been unloaded because that means
// that the user set the current theme to a custom theme and then
// changed his mind and undid it (reverting to the previous
// theme).
DCHECK_EQ(Source<Profile>(source).ptr(), profile_);
CHECK(extension);
if (!extension->is_theme()) {
return;
}
LOG(INFO) << "Got EXTENSION_UNLOADED notification for theme "
<< extension->id();
extension = current_theme;
break;
default:
LOG(DFATAL) << "Unexpected notification received: " << type.value;
break;
}
DCHECK_EQ(extension, current_theme);
if (extension) {
DCHECK(extension->is_theme());
}
LOG(INFO) << "Theme changed to " << GetThemeId(extension);
// Here, we know that a theme is being set; the theme is a custom
// theme iff extension is non-NULL.
sync_api::WriteTransaction trans(share_handle());
sync_api::WriteNode node(&trans);
if (!node.InitByClientTagLookup(syncable::THEMES,
kCurrentThemeClientTag)) {
std::string err = "Could not create node with client tag: ";
error_handler()->OnUnrecoverableError(FROM_HERE,
err + kCurrentThemeClientTag);
return;
}
sync_pb::ThemeSpecifics old_theme_specifics = node.GetThemeSpecifics();
// Make sure to base new_theme_specifics on old_theme_specifics so
// we preserve the state of use_system_theme_by_default.
sync_pb::ThemeSpecifics new_theme_specifics = old_theme_specifics;
GetThemeSpecificsFromCurrentTheme(profile_, &new_theme_specifics);
// Do a write only if something actually changed so as to guard
// against cycles.
if (!AreThemeSpecificsEqual(old_theme_specifics, new_theme_specifics)) {
node.SetThemeSpecifics(new_theme_specifics);
}
return;
}
void ThemeChangeProcessor::ApplyChangesFromSyncModel(
const sync_api::BaseTransaction* trans,
const sync_api::SyncManager::ChangeRecord* changes,
int change_count) {
if (!running()) {
return;
}
// TODO(akalin): Normally, we should only have a single change and
// it should be an update. However, the syncapi may occasionally
// generates multiple changes. When we fix syncapi to not do that,
// we can remove the extra logic below. See:
// http://code.google.com/p/chromium/issues/detail?id=41696 .
if (change_count < 1) {
std::string err("Unexpected change_count: ");
err += change_count;
error_handler()->OnUnrecoverableError(FROM_HERE, err);
return;
}
if (change_count > 1) {
LOG(WARNING) << change_count << " theme changes detected; "
<< "only applying the last one";
}
const sync_api::SyncManager::ChangeRecord& change =
changes[change_count - 1];
if (change.action != sync_api::SyncManager::ChangeRecord::ACTION_UPDATE &&
change.action != sync_api::SyncManager::ChangeRecord::ACTION_DELETE) {
std::string err = "strange theme change.action " + change.action;
error_handler()->OnUnrecoverableError(FROM_HERE, err);
return;
}
sync_pb::ThemeSpecifics theme_specifics;
// If the action is a delete, simply use the default values for
// ThemeSpecifics, which would cause the default theme to be set.
if (change.action != sync_api::SyncManager::ChangeRecord::ACTION_DELETE) {
sync_api::ReadNode node(trans);
if (!node.InitByIdLookup(change.id)) {
error_handler()->OnUnrecoverableError(FROM_HERE,
"Theme node lookup failed.");
return;
}
DCHECK_EQ(node.GetModelType(), syncable::THEMES);
DCHECK(profile_);
theme_specifics = node.GetThemeSpecifics();
}
StopObserving();
SetCurrentThemeFromThemeSpecificsIfNecessary(theme_specifics, profile_);
StartObserving();
}
void ThemeChangeProcessor::StartImpl(Profile* profile) {
DCHECK(profile);
profile_ = profile;
StartObserving();
}
void ThemeChangeProcessor::StopImpl() {
StopObserving();
profile_ = NULL;
}
void ThemeChangeProcessor::StartObserving() {
DCHECK(profile_);
LOG(INFO) << "Observing BROWSER_THEME_CHANGED, EXTENSION_LOADED, "
<< "and EXTENSION_UNLOADED";
notification_registrar_.Add(
this, NotificationType::BROWSER_THEME_CHANGED,
Source<BrowserThemeProvider>(profile_->GetThemeProvider()));
notification_registrar_.Add(
this, NotificationType::EXTENSION_LOADED,
Source<Profile>(profile_));
notification_registrar_.Add(
this, NotificationType::EXTENSION_UNLOADED,
Source<Profile>(profile_));
}
void ThemeChangeProcessor::StopObserving() {
DCHECK(profile_);
LOG(INFO) << "Unobserving all notifications";
notification_registrar_.RemoveAll();
}
} // namespace browser_sync
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