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// Copyright 2015 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 "ios/web/active_state_manager_impl.h"
#include "base/logging.h"
#include "ios/web/public/browser_state.h"
#include "ios/web/public/web_thread.h"
namespace web {
namespace {
// The number of ActiveStateManagers that are currently in active state.
// At most one ActiveStateManager can be active at any given time.
int g_active_state_manager_active_count = 0;
} // namespace
ActiveStateManagerImpl::ActiveStateManagerImpl(BrowserState* browser_state)
: browser_state_(browser_state), active_(false) {
DCHECK_CURRENTLY_ON_WEB_THREAD(WebThread::UI);
DCHECK(browser_state_);
}
ActiveStateManagerImpl::~ActiveStateManagerImpl() {
FOR_EACH_OBSERVER(Observer, observer_list_, WillBeDestroyed());
DCHECK(!IsActive());
}
void ActiveStateManagerImpl::SetActive(bool active) {
DCHECK_CURRENTLY_ON_WEB_THREAD(WebThread::UI);
if (active == active_) {
return;
}
if (active) {
++g_active_state_manager_active_count;
} else {
--g_active_state_manager_active_count;
}
DCHECK_GE(1, g_active_state_manager_active_count);
active_ = active;
if (active) {
FOR_EACH_OBSERVER(Observer, observer_list_, OnActive());
} else {
FOR_EACH_OBSERVER(Observer, observer_list_, OnInactive());
}
}
bool ActiveStateManagerImpl::IsActive() {
DCHECK_CURRENTLY_ON_WEB_THREAD(WebThread::UI);
return active_;
}
void ActiveStateManagerImpl::AddObserver(Observer* obs) {
DCHECK_CURRENTLY_ON_WEB_THREAD(WebThread::UI);
observer_list_.AddObserver(obs);
}
void ActiveStateManagerImpl::RemoveObserver(Observer* obs) {
DCHECK_CURRENTLY_ON_WEB_THREAD(WebThread::UI);
observer_list_.RemoveObserver(obs);
}
} // namespace web
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