Listener class for events that happen to a ValueTree. More...

#include <juce_ValueTree.h>

Inheritance diagram for ValueTree::Listener:

[legend]

Public Member Functions
virtual	~Listener ()
	Destructor. More...

virtual void	valueTreeChildAdded (ValueTree &parentTree, ValueTree &childWhichHasBeenAdded)=0
	This method is called when a child sub-tree is added. More...

virtual void	valueTreeChildOrderChanged (ValueTree &parentTreeWhoseChildrenHaveMoved, int oldIndex, int newIndex)=0
	This method is called when a tree's children have been re-shuffled. More...

virtual void	valueTreeChildRemoved (ValueTree &parentTree, ValueTree &childWhichHasBeenRemoved, int indexFromWhichChildWasRemoved)=0
	This method is called when a child sub-tree is removed. More...

virtual void	valueTreeParentChanged (ValueTree &treeWhoseParentHasChanged)=0
	This method is called when a tree has been added or removed from a parent node. More...

virtual void	valueTreePropertyChanged (ValueTree &treeWhosePropertyHasChanged, const Identifier &property)=0
	This method is called when a property of this node (or of one of its sub-nodes) has 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...

Detailed Description

Listener class for events that happen to a ValueTree.

To get events from a ValueTree, make your class implement this interface, and use ValueTree::addListener() and ValueTree::removeListener() to register it.

Constructor & Destructor Documentation

◆ ~Listener()

virtual ValueTree::Listener::~Listener ( )

inlinevirtual

Destructor.

Member Function Documentation

◆ valueTreeChildAdded()

virtual void ValueTree::Listener::valueTreeChildAdded	(	ValueTree &	parentTree,
		ValueTree &	childWhichHasBeenAdded
	)

pure virtual

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.

Implemented in ComponentBuilder, AudioProcessorValueTreeState, CachedValue< Type >, and ValueTreeSynchroniser.

◆ valueTreeChildOrderChanged()

virtual void ValueTree::Listener::valueTreeChildOrderChanged	(	ValueTree &	parentTreeWhoseChildrenHaveMoved,
		int	oldIndex,
		int	newIndex
	)

pure virtual

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.

Implemented in ComponentBuilder, AudioProcessorValueTreeState, CachedValue< Type >, and ValueTreeSynchroniser.

◆ valueTreeChildRemoved()

virtual void ValueTree::Listener::valueTreeChildRemoved	(	ValueTree &	parentTree,
		ValueTree &	childWhichHasBeenRemoved,
		int	indexFromWhichChildWasRemoved
	)

pure virtual

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.

Implemented in ComponentBuilder, AudioProcessorValueTreeState, CachedValue< Type >, and ValueTreeSynchroniser.

◆ valueTreeParentChanged()

virtual void ValueTree::Listener::valueTreeParentChanged ( ValueTree & treeWhoseParentHasChanged )

pure virtual

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

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.

Implemented in ComponentBuilder, AudioProcessorValueTreeState, CachedValue< Type >, and ValueTreeSynchroniser.

◆ valueTreePropertyChanged()

virtual void ValueTree::Listener::valueTreePropertyChanged	(	ValueTree &	treeWhosePropertyHasChanged,
		const Identifier &	property
	)

pure virtual

This method is called when a property of this node (or of one of its sub-nodes) has changed.

The tree parameter indicates which tree has had its property changed, and the property parameter indicates the property.

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.

Implemented in ComponentBuilder, AudioProcessorValueTreeState, CachedValue< Type >, and ValueTreeSynchroniser.