mirror of
https://github.com/juce-framework/JUCE.git
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145 lines
3.8 KiB
C++
145 lines
3.8 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE 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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