Eclipse Plug-in Developer Guide (Galileo) - ObservableSetContentProvider (Eclipse Platform API Specification)

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Eclipse Platform
Release 3.5

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org.eclipse.jface.databinding.viewers
Class ObservableSetContentProvider


java.lang.Object
  
org.eclipse.jface.databinding.viewers.ObservableSetContentProvider

All Implemented Interfaces:: IContentProvider, IStructuredContentProvider

public class ObservableSetContentProvider
extends Object
implements IStructuredContentProvider
extends Object
implements IStructuredContentProvider

A content provider for AbstractTableViewer or AbstractListViewer that provides elements of an IObservableSet when set as the viewer's input. Objects of this class listen for changes to the observable set, and will insert and remove viewer elements to reflect observed changes.

Since:: 1.1
Restriction:: This class is not intended to be subclassed by clients.

Constructor Summary

ObservableSetContentProvider ()
          Constructs an ObservableSetContentProvider

ObservableSetContentProvider ( IViewerUpdater viewerUpdater)
          Constructs an ObservableSetContentProvider with the given viewer updater

Method Summary

void dispose ()
          Disposes of this content provider.

Object[] getElements ( Object inputElement)
          Returns the elements to display in the viewer when its input is set to the given element.

IObservableSet getKnownElements ()
          Returns the set of elements known to this content provider.

IObservableSet getRealizedElements ()
          Returns the set of known elements which have been realized in the viewer.

void inputChanged ( Viewer viewer, Object oldInput, Object newInput)
          Notifies this content provider that the given viewer's input has been switched to a different element.

Methods inherited from class java.lang. Object

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

Constructor Detail

ObservableSetContentProvider

public ObservableSetContentProvider()

Constructs an ObservableSetContentProvider

ObservableSetContentProvider

public ObservableSetContentProvider(
IViewerUpdater viewerUpdater)

Constructs an ObservableSetContentProvider with the given viewer updater

Parameters:: viewerUpdater - the viewer updater to use when elements are added or removed from the input observable set.
Since:: 1.3

Method Detail

inputChanged

public void inputChanged(
Viewer viewer,
                         
Object oldInput,
                         
Object newInput)

Description copied from interface: IContentProvider

Notifies this content provider that the given viewer's input has been switched to a different element.

A typical use for this method is registering the content provider as a listener to changes on the new input (using model-specific means), and deregistering the viewer from the old input. In response to these change notifications, the content provider should update the viewer (see the add, remove, update and refresh methods on the viewers).

The viewer should not be updated during this call, as it might be in the process of being disposed.

Specified by:: inputChanged in interface IContentProvider

Parameters:: viewer - the viewer; oldInput - the old input element, or null if the viewer did not previously have an input; newInput - the new input element, or null if the viewer does not have an input

getElements

public 
Object[] getElements(
Object inputElement)

Description copied from interface: IStructuredContentProvider

Returns the elements to display in the viewer when its input is set to the given element. These elements can be presented as rows in a table, items in a list, etc. The result is not modified by the viewer.

NOTE: For instances where the viewer is displaying a tree containing a single 'root' element it is still necessary that the 'input' does not return itself from this method. This leads to recursion issues (see bug 9262).

Specified by:: getElements in interface IStructuredContentProvider

Parameters:: inputElement - the input element
Returns:: the array of elements to display in the viewer

dispose

public void dispose()

Description copied from interface: IContentProvider

Disposes of this content provider. This is called by the viewer when it is disposed.

The viewer should not be updated during this call, as it is in the process of being disposed.

Specified by:: dispose in interface IContentProvider

getKnownElements

public 
IObservableSet getKnownElements()

Returns the set of elements known to this content provider. Label providers may track this set if they need to be notified about additions before the viewer sees the added element, and notified about removals after the element was removed from the viewer. This is intended for use by label providers, as it will always return the items that need labels.

Returns:: unmodifiable set of items that will need labels

getRealizedElements

public 
IObservableSet getRealizedElements()

Returns the set of known elements which have been realized in the viewer. Clients may track this set in order to perform custom actions on elements while they are known to be present in the viewer.