public interface ILazyTreePathContentProvider extends IContentProvider
|Modifier and Type||Method and Description|
Return the possible parent paths for the given element.
Called when a previously-blank item becomes visible in the TreeViewer.
Called when the TreeViewer needs up-to-date information whether the node at the given tree path can be expanded.
void updateElement(TreePath parentPath, int index)
TreeViewer.replace(Object, int, Object). The content provider should also update the child count for any replaced element by calling
TreeViewer.setChildCount(Object, int). If the given current child count is already correct, setChildCount does not have to be called since a call to replace will not change the child count. If the content provider doesn't know the child count at this point, and can more efficiently determine if the element has any children, then it can instead call
NOTE #updateElement(int index) can be used to determine selection values. If TableViewer#replace(Object, int) is not called before returning from this method, selections may have missing or stale elements. In this situation it is suggested that the selection is asked for again after replace() has been called.
parentPath- The tree path of parent of the element, or if the element to update is a root element, an empty tree path
index- The index of the element to update in the tree
void updateChildCount(TreePath treePath, int currentChildCount)
StructuredViewer.setInput(Object). If the content provider knows the element at the given tree path, it should respond by calling
TreeViewer.setChildCount(Object, int). If the given current child count is already correct, no action has to be taken by this content provider.
treePath- The tree path for which an up-to-date child count is needed, or if the number of root elements is requested, the empty tree path
currentChildCount- The current child count for the element that needs updating
void updateHasChildren(TreePath path)
TreeViewer.setHasChildren(Object, boolean). The content provider may also choose to call
TreeViewer.setChildCount(Object, int)instead if it knows the number of 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
path- The tree path for which up-to-date information about children is needed
element- the element
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