TopComponent.Registry (Window System API)

Enclosing class:

TopComponent
```
public static interface TopComponent.Registry
```
Registry of all top components. There is one instance that can be obtained via TopComponent.getRegistry() and it permits listening to the currently selected element, and to the activated nodes assigned to it.

Field Summary

Fields
Modifier and Type	Field	Description
`static java.lang.String`	`PROP_ACTIVATED`	Name of property for the selected top component.
`static java.lang.String`	`PROP_ACTIVATED_NODES`	Name of property for lastly activated nodes.
`static java.lang.String`	`PROP_CURRENT_NODES`	Name of property for currently selected nodes.
`static java.lang.String`	`PROP_OPENED`	Name of property for the set of opened components.
`static java.lang.String`	`PROP_TC_CLOSED`	Name of property for listening to TopComponents closed through close() call, either by user or programmatically.
`static java.lang.String`	`PROP_TC_OPENED`	Name of property for listening to TopComponents opened through open() call, either by user or programmatically.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addPropertyChangeListener(java.beans.PropertyChangeListener l)`	Add a property change listener.
`TopComponent`	`getActivated()`	Get the currently selected element.
`org.openide.nodes.Node[]`	`getActivatedNodes()`	Getter for the lastly activated nodes.
`org.openide.nodes.Node[]`	`getCurrentNodes()`	Getter for the currently selected nodes.
`java.util.Set<TopComponent>`	`getOpened()`	Get reference to a set of all opened componets in the system.
`void`	`removePropertyChangeListener(java.beans.PropertyChangeListener l)`	Remove a property change listener.

- Field Detail
  - PROP_OPENED
```
static final java.lang.String PROP_OPENED
```
    Name of property for the set of opened components.
    
    See Also:
    
    Constant Field Values
  - PROP_ACTIVATED
```
static final java.lang.String PROP_ACTIVATED
```
    Name of property for the selected top component.
    
    See Also:
    
    Constant Field Values
  - PROP_CURRENT_NODES
```
static final java.lang.String PROP_CURRENT_NODES
```
    Name of property for currently selected nodes.
    
    See Also:
    
    Constant Field Values
  - PROP_ACTIVATED_NODES
```
static final java.lang.String PROP_ACTIVATED_NODES
```
    Name of property for lastly activated nodes.
    
    See Also:
    
    Constant Field Values
  - PROP_TC_OPENED
```
static final java.lang.String PROP_TC_OPENED
```
    Name of property for listening to TopComponents opened through open() call, either by user or programmatically. Fired property change event returns opened TopComponent from its getNewValue()
    
    See Also:
    
    Constant Field Values
  - PROP_TC_CLOSED
```
static final java.lang.String PROP_TC_CLOSED
```
    Name of property for listening to TopComponents closed through close() call, either by user or programmatically. Fired property change event returns closed TopComponent from its getNewValue().
    
    See Also:
    
    Constant Field Values
- Method Detail
  - getOpened
```
java.util.Set<TopComponent> getOpened()
```
    Get reference to a set of all opened componets in the system.
    
    Returns:
    
    live read-only set of TopComponents
  - getActivated
```
TopComponent getActivated()
```
    Get the currently selected element.
    
    Returns:
    
    the selected top component, or null if there is none
  - getCurrentNodes
```
org.openide.nodes.Node[] getCurrentNodes()
```
    Getter for the currently selected nodes.
    
    Returns:
    
    array of nodes or null if no component activated or it returns null from getActivatedNodes ().
  - getActivatedNodes
```
org.openide.nodes.Node[] getActivatedNodes()
```
    Getter for the lastly activated nodes. Comparing to previous method it always remembers the selected nodes of the last component that had ones.
    
    Returns:
    
    array of nodes (not null)
  - addPropertyChangeListener
```
void addPropertyChangeListener(java.beans.PropertyChangeListener l)
```
    Add a property change listener.
    
    Parameters:
    
    l - the listener to add
  - removePropertyChangeListener
```
void removePropertyChangeListener(java.beans.PropertyChangeListener l)
```
    Remove a property change listener.
    
    Parameters:
    
    l - the listener to remove

Interface TopComponent.Registry

Field Summary

Method Summary

Field Detail

PROP_OPENED

PROP_ACTIVATED

PROP_CURRENT_NODES

PROP_ACTIVATED_NODES

PROP_TC_OPENED

PROP_TC_CLOSED

Method Detail

getOpened

getActivated

getCurrentNodes

getActivatedNodes

addPropertyChangeListener

removePropertyChangeListener