mirror of
https://github.com/juce-framework/JUCE.git
synced 2026-01-10 23:44:24 +00:00
133 lines
3.2 KiB
C++
133 lines
3.2 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2022 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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class LockingAsyncUpdater::Impl : public CallbackMessage
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{
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public:
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explicit Impl (std::function<void()> cb)
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: callback (std::move (cb)) {}
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void clear()
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{
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const ScopedLock lock (mutex);
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deliver = false;
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callback = nullptr;
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}
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void trigger()
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{
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{
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const ScopedLock lock (mutex);
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if (deliver)
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return;
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deliver = true;
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}
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if (! post())
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cancel();
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}
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void cancel()
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{
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const ScopedLock lock (mutex);
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deliver = false;
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}
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bool isPending()
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{
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const ScopedLock lock (mutex);
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return deliver;
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}
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void messageCallback() override
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{
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const ScopedLock lock (mutex);
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if (std::exchange (deliver, false))
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NullCheckedInvocation::invoke (callback);
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}
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private:
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CriticalSection mutex;
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std::function<void()> callback;
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bool deliver = false;
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};
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//==============================================================================
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LockingAsyncUpdater::LockingAsyncUpdater (std::function<void()> callbackToUse)
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: impl (new Impl (std::move (callbackToUse))) {}
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LockingAsyncUpdater::LockingAsyncUpdater (LockingAsyncUpdater&& other) noexcept
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: impl (std::exchange (other.impl, nullptr)) {}
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LockingAsyncUpdater& LockingAsyncUpdater::operator= (LockingAsyncUpdater&& other) noexcept
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{
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LockingAsyncUpdater temp { std::move (other) };
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std::swap (temp.impl, impl);
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return *this;
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}
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LockingAsyncUpdater::~LockingAsyncUpdater()
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{
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if (impl != nullptr)
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impl->clear();
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}
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void LockingAsyncUpdater::triggerAsyncUpdate()
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{
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if (impl != nullptr)
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impl->trigger();
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else
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jassertfalse; // moved-from!
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}
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void LockingAsyncUpdater::cancelPendingUpdate() noexcept
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{
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if (impl != nullptr)
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impl->cancel();
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else
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jassertfalse; // moved-from!
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}
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void LockingAsyncUpdater::handleUpdateNowIfNeeded()
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{
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if (impl != nullptr)
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impl->messageCallback();
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else
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jassertfalse; // moved-from!
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}
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bool LockingAsyncUpdater::isUpdatePending() const noexcept
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{
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if (impl != nullptr)
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return impl->isPending();
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jassertfalse; // moved-from!
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return false;
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}
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} // namespace juce
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