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// Copyright 2016 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 "components/exo/wm_helper.h"
namespace exo {
namespace {
WMHelper* g_instance = nullptr;
} // namespace
WMHelper::LifetimeManager::LifetimeManager() = default;
WMHelper::LifetimeManager::~LifetimeManager() {
for (Observer& observer : observers_)
observer.OnDestroyed();
}
void WMHelper::LifetimeManager::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void WMHelper::LifetimeManager::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
WMHelper::WMHelper() {}
WMHelper::~WMHelper() {}
// static
void WMHelper::SetInstance(WMHelper* helper) {
DCHECK_NE(!!helper, !!g_instance);
g_instance = helper;
}
// static
WMHelper* WMHelper::GetInstance() {
DCHECK(g_instance);
return g_instance;
}
// static
bool WMHelper::HasInstance() {
return !!g_instance;
}
} // namespace exo
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