Mercurial > projects > dwt2
view org.eclipse.jface/src/org/eclipse/jface/viewers/ILazyTreeContentProvider.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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/******************************************************************************* * Copyright (c) 2005, 2006 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module org.eclipse.jface.viewers.ILazyTreeContentProvider; import org.eclipse.jface.viewers.IContentProvider; import java.lang.all; import java.util.Set; /** * The ILazyTreeContentProvider is the content provider for tree viewers created * using the SWT.VIRTUAL flag that only wish to return their contents as they * are queried. * * @since 3.2 */ public interface ILazyTreeContentProvider : IContentProvider { /** * Called when a previously-blank item becomes visible in the TreeViewer. If * the content provider knows the child element for the given parent at this * index, it should respond by calling * {@link TreeViewer#replace(Object, int, Object)}. The content provider * should also update the child count for any replaced element by calling * {@link 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. * * <strong>NOTE</strong> #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. * * @param parent * The parent of the element, or the viewer's input if the * element to update is a root element * @param index * The index of the element to update in the tree */ public void updateElement(Object parent, int index); /** * Called when the TreeViewer needs an up-to-date child count for the given * element, for example from {@link TreeViewer#refresh()} and * {@link TreeViewer#setInput(Object)}. If the content provider knows the * given element, it should respond by calling * {@link TreeViewer#setChildCount(Object, int)}. If the given current * child count is already correct, no action has to be taken by this content * provider. * * @param element * The element for which an up-to-date child count is needed, or * the viewer's input if the number of root elements is requested * @param currentChildCount * The current child count for the element that needs updating */ public void updateChildCount(Object element, int currentChildCount); /** * Returns the parent for the given element, or <code>null</code> * indicating that the parent can't be computed. * In this case the tree-structured viewer can't expand * a given node correctly if requested. * * @param element the element * @return the parent element, or <code>null</code> if it * has none or if the parent cannot be computed */ public Object getParent(Object element); }