mirror of
https://github.com/juce-framework/JUCE.git
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122 lines
3.3 KiB
C++
122 lines
3.3 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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VBlankAttachment::VBlankAttachment (Component* c, std::function<void()> callbackIn)
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: owner (c),
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callback (std::move (callbackIn))
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{
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jassert (owner != nullptr && callback);
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updateOwner();
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updatePeer();
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}
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VBlankAttachment::VBlankAttachment (VBlankAttachment&& other)
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: VBlankAttachment (other.owner, std::move (other.callback))
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{
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other.cleanup();
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}
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VBlankAttachment& VBlankAttachment::operator= (VBlankAttachment&& other)
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{
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cleanup();
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owner = other.owner;
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callback = std::move (other.callback);
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updateOwner();
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updatePeer();
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other.cleanup();
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return *this;
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}
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VBlankAttachment::~VBlankAttachment()
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{
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cleanup();
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}
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void VBlankAttachment::onVBlank()
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{
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callback();
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}
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void VBlankAttachment::componentParentHierarchyChanged (Component&)
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{
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updatePeer();
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}
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void VBlankAttachment::updateOwner()
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{
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if (auto previousLastOwner = std::exchange (lastOwner, owner); previousLastOwner != owner)
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{
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if (previousLastOwner != nullptr)
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previousLastOwner->removeComponentListener (this);
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if (owner != nullptr)
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owner->addComponentListener (this);
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}
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}
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void VBlankAttachment::updatePeer()
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{
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if (owner != nullptr)
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{
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if (auto* peer = owner->getPeer())
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{
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peer->addVBlankListener (this);
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if (lastPeer != peer && ComponentPeer::isValidPeer (lastPeer))
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lastPeer->removeVBlankListener (this);
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lastPeer = peer;
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}
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}
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else if (auto peer = std::exchange (lastPeer, nullptr); ComponentPeer::isValidPeer (peer))
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{
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peer->removeVBlankListener (this);
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}
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}
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void VBlankAttachment::cleanup()
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{
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owner = nullptr;
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updateOwner();
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updatePeer();
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}
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} // namespace juce
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