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/*
* SPDX-License-Identifier: GPL-2.0-or-later
* SPDX-FileName: AppEvents.cpp
* SPDX-FileContributor: Dmitry Vedenko
*/
#include "AppEvents.h"
#include <cassert>
#include <vector>
namespace AppEvents
{
namespace
{
struct IdleEvent
{
};
struct EventHandlers final : public Observer::Publisher<IdleEvent>
{
std::vector<std::function<void()>> appInitialized;
std::vector<std::function<void()>> appClosing;
bool AppInitializedCalled {};
bool AppClosingCalled {};
using Observer::Publisher<IdleEvent>::Subscribe;
using Observer::Publisher<IdleEvent>::Publish;
};
EventHandlers& GetEventHandlers()
{
static EventHandlers handlers;
return handlers;
}
} // namespace
void OnAppInitialized(std::function<void()> callback)
{
assert(callback);
if (!callback)
return;
auto& handlers = GetEventHandlers();
if (handlers.AppInitializedCalled)
callback();
else
handlers.appInitialized.push_back(std::move(callback));
}
void OnAppClosing(std::function<void()> callback)
{
assert(callback);
if (!callback)
return;
auto& handlers = GetEventHandlers();
if (handlers.AppClosingCalled)
callback();
else
handlers.appClosing.push_back(std::move(callback));
}
Observer::Subscription OnAppIdle(std::function<void()> callback)
{
return GetEventHandlers().Subscribe([callback = std::move(callback)](auto&)
{ callback(); });
}
void ProviderBase::HandleAppInitialized()
{
auto& handlers = GetEventHandlers();
handlers.AppInitializedCalled = true;
std::vector<std::function<void()>> callbacks;
std::swap(callbacks, handlers.appInitialized);
for (auto& callback : callbacks)
callback();
}
void ProviderBase::HandleAppIdle()
{
GetEventHandlers().Publish(IdleEvent{});
}
void ProviderBase::HandleAppClosing()
{
auto& handlers = GetEventHandlers();
handlers.AppClosingCalled = true;
std::vector<std::function<void()>> callbacks;
std::swap(callbacks, handlers.appClosing);
for (auto& callback : callbacks)
callback();
}
} // namespace AppEvents
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