JUCE  v6.1.6 (6.0.8-1114)
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juce::ValueTreeSynchroniser Class Referenceabstract

This class can be used to watch for all changes to the state of a ValueTree, and to convert them to a transmittable binary encoding. More...

#include <juce_ValueTreeSynchroniser.h>

Inheritance diagram for juce::ValueTreeSynchroniser:
Collaboration diagram for juce::ValueTreeSynchroniser:

Public Member Functions

 ValueTreeSynchroniser (const ValueTree &tree)
 Creates a ValueTreeSynchroniser that watches the given tree. More...
 
 ~ValueTreeSynchroniser () override
 Destructor. More...
 
const ValueTreegetRoot () noexcept
 Returns the root ValueTree that is being observed. More...
 
void sendFullSyncCallback ()
 Forces the sending of a full state message, which may be large, as it encodes the entire ValueTree. More...
 
virtual void stateChanged (const void *encodedChange, size_t encodedChangeSize)=0
 This callback happens when the ValueTree changes and the given state-change message needs to be applied to any other trees that need to stay in sync with it. More...
 

Static Public Member Functions

static bool applyChange (ValueTree &target, const void *encodedChangeData, size_t encodedChangeDataSize, UndoManager *undoManager)
 Applies an encoded change to the given destination tree. More...
 

Private Member Functions

void valueTreeChildAdded (ValueTree &, ValueTree &) override
 This method is called when a child sub-tree is added. More...
 
void valueTreeChildOrderChanged (ValueTree &, int, int) override
 This method is called when a tree's children have been re-shuffled. More...
 
void valueTreeChildRemoved (ValueTree &, ValueTree &, int) override
 This method is called when a child sub-tree is removed. More...
 
virtual void valueTreeParentChanged (ValueTree &treeWhoseParentHasChanged)
 This method is called when a tree has been added or removed from a parent. More...
 
void valueTreePropertyChanged (ValueTree &, const Identifier &) override
 This method is called when a property of this tree (or of one of its sub-trees) is changed. More...
 
virtual void valueTreeRedirected (ValueTree &treeWhichHasBeenChanged)
 This method is called when a tree is made to point to a different internal shared object. More...
 

Private Attributes

ValueTree valueTree
 

Detailed Description

This class can be used to watch for all changes to the state of a ValueTree, and to convert them to a transmittable binary encoding.

The purpose of this class is to allow two or more ValueTrees to be remotely synchronised by transmitting encoded changes over some kind of transport mechanism.

To use it, you'll need to implement a subclass of ValueTreeSynchroniser and implement the stateChanged() method to transmit the encoded change (maybe via a network or other means) to a remote destination, where it can be applied to a target tree.

@tags{DataStructures}

Constructor & Destructor Documentation

◆ ValueTreeSynchroniser()

juce::ValueTreeSynchroniser::ValueTreeSynchroniser ( const ValueTree tree)

Creates a ValueTreeSynchroniser that watches the given tree.

After creating an instance of this class and somehow attaching it to a target tree, you probably want to call sendFullSyncCallback() to get them into a common starting state.

◆ ~ValueTreeSynchroniser()

juce::ValueTreeSynchroniser::~ValueTreeSynchroniser ( )
override

Destructor.

Member Function Documentation

◆ applyChange()

static bool juce::ValueTreeSynchroniser::applyChange ( ValueTree target,
const void *  encodedChangeData,
size_t  encodedChangeDataSize,
UndoManager undoManager 
)
static

Applies an encoded change to the given destination tree.

When you implement a receiver for changes that were sent by the stateChanged() message, this is the function that you'll need to call to apply them to the target tree that you want to be synced.

◆ getRoot()

const ValueTree& juce::ValueTreeSynchroniser::getRoot ( )
inlinenoexcept

Returns the root ValueTree that is being observed.

◆ sendFullSyncCallback()

void juce::ValueTreeSynchroniser::sendFullSyncCallback ( )

Forces the sending of a full state message, which may be large, as it encodes the entire ValueTree.

This will internally invoke stateChanged() with the encoded version of the state.

◆ stateChanged()

virtual void juce::ValueTreeSynchroniser::stateChanged ( const void *  encodedChange,
size_t  encodedChangeSize 
)
pure virtual

This callback happens when the ValueTree changes and the given state-change message needs to be applied to any other trees that need to stay in sync with it.

The data is an opaque blob of binary that you should transmit to wherever your target tree lives, and use applyChange() to apply this to the target tree.

◆ valueTreeChildAdded()

void juce::ValueTreeSynchroniser::valueTreeChildAdded ( ValueTree parentTree,
ValueTree childWhichHasBeenAdded 
)
overrideprivatevirtual

This method is called when a child sub-tree is added.

Note that when you register a listener to a tree, it will receive this callback for child changes in both that tree and any of its children, (recursively, at any depth). If your tree has sub-trees but you only want to know about changes to the top level tree, just check the parentTree parameter to make sure it's the one that you're interested in.

Reimplemented from juce::ValueTree::Listener.

◆ valueTreeChildOrderChanged()

void juce::ValueTreeSynchroniser::valueTreeChildOrderChanged ( ValueTree parentTreeWhoseChildrenHaveMoved,
int  oldIndex,
int  newIndex 
)
overrideprivatevirtual

This method is called when a tree's children have been re-shuffled.

Note that when you register a listener to a tree, it will receive this callback for child changes in both that tree and any of its children, (recursively, at any depth). If your tree has sub-trees but you only want to know about changes to the top level tree, just check the parameter to make sure it's the tree that you're interested in.

Reimplemented from juce::ValueTree::Listener.

◆ valueTreeChildRemoved()

void juce::ValueTreeSynchroniser::valueTreeChildRemoved ( ValueTree parentTree,
ValueTree childWhichHasBeenRemoved,
int  indexFromWhichChildWasRemoved 
)
overrideprivatevirtual

This method is called when a child sub-tree is removed.

Note that when you register a listener to a tree, it will receive this callback for child changes in both that tree and any of its children, (recursively, at any depth). If your tree has sub-trees but you only want to know about changes to the top level tree, just check the parentTree parameter to make sure it's the one that you're interested in.

Reimplemented from juce::ValueTree::Listener.

◆ valueTreeParentChanged()

virtual void juce::ValueTree::Listener::valueTreeParentChanged ( ValueTree treeWhoseParentHasChanged)
virtualinherited

This method is called when a tree has been added or removed from a parent.

This callback happens when the tree to which the listener was registered is added or removed from a parent. Unlike the other callbacks, it applies only to the tree to which the listener is registered, and not to any of its children.

Reimplemented in juce::ComponentBuilder.

◆ valueTreePropertyChanged()

void juce::ValueTreeSynchroniser::valueTreePropertyChanged ( ValueTree treeWhosePropertyHasChanged,
const Identifier property 
)
overrideprivatevirtual

This method is called when a property of this tree (or of one of its sub-trees) is changed.

Note that when you register a listener to a tree, it will receive this callback for property changes in that tree, and also for any of its children, (recursively, at any depth). If your tree has sub-trees but you only want to know about changes to the top level tree, simply check the tree parameter in this callback to make sure it's the tree you're interested in.

Reimplemented from juce::ValueTree::Listener.

◆ valueTreeRedirected()

virtual void juce::ValueTree::Listener::valueTreeRedirected ( ValueTree treeWhichHasBeenChanged)
virtualinherited

This method is called when a tree is made to point to a different internal shared object.

When operator= is used to make a ValueTree refer to a different object, this callback will be made.

Reimplemented in juce::AudioProcessorValueTreeState.

Member Data Documentation

◆ valueTree

ValueTree juce::ValueTreeSynchroniser::valueTree
private

The documentation for this class was generated from the following file: