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oracle.javatools.ui.tree.lazy
Class LazyProgressController

java.lang.Object
oracle.javatools.ui.tree.lazy.LazyProgressController

public final class LazyProgressController

extends java.lang.Object

A mechanism to track and control the lazy loading of tree nodes.

A controller is not required to use lazy loading nodes - they can be added to the tree and will work as advertised - but the controller does offer additional abilities such as being able to cancel nodes currently in the progress of fetching children.

If used, a controller is intended to track all lazy nodes in a tree, and provide feedback via property changes whether there is at least one node in the tree currently fetching children.

A cancel mechanism is also provided which will cancel any active fetching.

These two things combined are primarily designed to allow a 'stop' ui, such as a button above the lazy tree that can be enabled/disabled as the lazy nodes load, and when pressed can cancel any fetching.

Field Summary

static java.lang.String

PROPERTY_PROGRESS_ACTIVE Property informing that there is at least one tracked progress node currently fetching its children.

Constructor Summary

LazyProgressController(javax.swing.JTree tree)

Method Summary

void	addPropertyChangeListener(java.beans.PropertyChangeListener listener)
void	cancelProgress() Stop any nodes that currently fetching children, and return the nodes to the pre-fetched state
boolean	isProgressActive()
void	removePropertyChangeListener(java.beans.PropertyChangeListener listener)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PROPERTY_PROGRESS_ACTIVE

public static final java.lang.String PROPERTY_PROGRESS_ACTIVE

Property informing that there is at least one tracked progress node currently fetching its children.

See Also:

Constant Field Values

Constructor Detail

LazyProgressController

public LazyProgressController(javax.swing.JTree tree)

Method Detail

cancelProgress

public void cancelProgress()

Stop any nodes that currently fetching children, and return the nodes to the pre-fetched state

isProgressActive

public boolean isProgressActive()

Returns:

true if there is at least one tracked node currently fetching

addPropertyChangeListener

public void addPropertyChangeListener(java.beans.PropertyChangeListener listener)

removePropertyChangeListener

public void removePropertyChangeListener(java.beans.PropertyChangeListener listener)

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