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106 lines
4.4 KiB
C++
106 lines
4.4 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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//==============================================================================
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/**
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This class can be used to watch for all changes to the state of a ValueTree,
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and to convert them to a transmittable binary encoding.
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The purpose of this class is to allow two or more ValueTrees to be remotely
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synchronised by transmitting encoded changes over some kind of transport
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mechanism.
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To use it, you'll need to implement a subclass of ValueTreeSynchroniser
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and implement the stateChanged() method to transmit the encoded change (maybe
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via a network or other means) to a remote destination, where it can be
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applied to a target tree.
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@tags{DataStructures}
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*/
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class JUCE_API ValueTreeSynchroniser : private ValueTree::Listener
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{
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public:
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/** Creates a ValueTreeSynchroniser that watches the given tree.
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After creating an instance of this class and somehow attaching it to
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a target tree, you probably want to call sendFullSyncCallback() to
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get them into a common starting state.
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*/
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ValueTreeSynchroniser (const ValueTree& tree);
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/** Destructor. */
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~ValueTreeSynchroniser() override;
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/** This callback happens when the ValueTree changes and the given state-change message
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needs to be applied to any other trees that need to stay in sync with it.
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The data is an opaque blob of binary that you should transmit to wherever your
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target tree lives, and use applyChange() to apply this to the target tree.
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*/
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virtual void stateChanged (const void* encodedChange, size_t encodedChangeSize) = 0;
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/** Forces the sending of a full state message, which may be large, as it
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encodes the entire ValueTree.
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This will internally invoke stateChanged() with the encoded version of the state.
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*/
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void sendFullSyncCallback();
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/** Applies an encoded change to the given destination tree.
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When you implement a receiver for changes that were sent by the stateChanged()
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message, this is the function that you'll need to call to apply them to the
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target tree that you want to be synced.
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*/
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static bool applyChange (ValueTree& target,
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const void* encodedChangeData, size_t encodedChangeDataSize,
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UndoManager* undoManager);
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/** Returns the root ValueTree that is being observed. */
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const ValueTree& getRoot() noexcept { return valueTree; }
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private:
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ValueTree valueTree;
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void valueTreePropertyChanged (ValueTree&, const Identifier&) override;
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void valueTreeChildAdded (ValueTree&, ValueTree&) override;
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void valueTreeChildRemoved (ValueTree&, ValueTree&, int) override;
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void valueTreeChildOrderChanged (ValueTree&, int, int) override;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ValueTreeSynchroniser)
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};
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} // namespace juce
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