100 lines
3.9 KiB
C
100 lines
3.9 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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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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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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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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//==============================================================================
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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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virtual ~ValueTreeSynchroniser();
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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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void valueTreeParentChanged (ValueTree&) 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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