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org.eclipse.jface.viewers
Interface ITreeContentProvider
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All Superinterfaces:
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IContentProvider,
IStructuredContentProvider
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All Known Subinterfaces:
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ICommonContentProvider,
IPipelinedTreeContentProvider
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All Known Implementing Classes:
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AbstractSynchronizationContentProvider,
BaseWorkbenchContentProvider,
ObservableListTreeContentProvider,
ObservableSetTreeContentProvider,
PreferenceContentProvider,
RefactoringHistoryContentProvider,
SynchronizationContentProvider,
TreeNodeContentProvider,
WorkbenchContentProvider
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public interface ITreeContentProvider
- extends
IStructuredContentProvider
An interface to content providers for tree-structure-oriented
viewers.
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See Also:
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AbstractTreeViewer
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Method Summary
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Object[]
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getChildren
(
Object parentElement)
Returns the child elements of the given parent element. |
Object
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getParent
(
Object element)
Returns the parent for the given element, or null
indicating that the parent can't be computed. |
boolean
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hasChildren
(
Object element)
Returns whether the given element has children. |
getChildren
Object[] getChildren(
Object parentElement)
- Returns the child elements of the given parent element.
The difference between this method and IStructuredContentProvider.getElements
is that getElements is called to obtain the
tree viewer's root elements, whereas getChildren is used
to obtain the children of a given parent element in the tree (including a root).
The result is not modified by the viewer.
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Parameters:
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parentElement - the parent element
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Returns:
- an array of child elements
getParent
Object getParent(
Object element)
- Returns the parent for the given element, or
null
indicating that the parent can't be computed.
In this case the tree-structured viewer can't expand
a given node correctly if requested.
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Parameters:
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element - the element
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Returns:
- the parent element, or
null if it
has none or if the parent cannot be computed
hasChildren
boolean hasChildren(
Object element)
- Returns whether the given element has children.
Intended as an optimization for when the viewer does not
need the actual children. Clients may be able to implement
this more efficiently than getChildren.
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Parameters:
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element - the element
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Returns:
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true if the given element has children,
and false if it has no children
Guidelines for using Eclipse APIs.
Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.
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