* Copyright (c) 2026 Huawei Device Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "high_contrast_observer.h"
namespace OHOS::Ace::Platform {
HighContrastObserver& HighContrastObserver::GetInstance()
{
static HighContrastObserver instance;
return instance;
}
void HighContrastObserver::SubscribeHighContrastChange(int32_t instanceId, HighContrastCallback&& callback)
{
std::lock_guard<std::mutex> lock(mutex_);
callbacks_[instanceId] = std::move(callback);
}
void HighContrastObserver::SetListenHighContrastCallback(ListenHighContrastCallback&& callback)
{
std::lock_guard<std::mutex> lock(mutex_);
listenHighContrastCallback_ = std::move(callback);
if (listenHighContrastCallback_) {
listenHighContrastCallback_(highContrastState_);
}
for (auto& pair : callbacks_) {
if (pair.second) {
pair.second();
}
}
}
void HighContrastObserver::UnsubscribeHighContrastChange(int32_t instanceId)
{
std::lock_guard<std::mutex> lock(mutex_);
callbacks_.erase(instanceId);
}
void HighContrastObserver::OnHighContrastChange(bool newHighContrast)
{
std::lock_guard<std::mutex> lock(mutex_);
if (highContrastState_ == newHighContrast) {
return;
}
highContrastState_ = newHighContrast;
if (listenHighContrastCallback_) {
listenHighContrastCallback_(highContrastState_);
}
for (auto& pair : callbacks_) {
if (pair.second) {
pair.second();
}
}
}
}