/******************************************************************************* * Copyright (c) 2000, 2008 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 *******************************************************************************/ package org.eclipse.jface.text; /** * Computes the information to be shown in a hover popup which appears on top of * the text viewer's text widget when a hover event occurs. If the text hover * does not provide information no hover popup is shown. Any implementer of this * interface must be capable of operating in a non-UI thread. *
*
* In order to provide backward compatibility for clients of
* ITextHover
, extension interfaces are used as a means of
* evolution. The following extension interfaces exist:
*
* Clients may implement this interface.
* * @see org.eclipse.jface.text.ITextHoverExtension * @see org.eclipse.jface.text.ITextHoverExtension2 * @see org.eclipse.jface.text.ITextViewer */ public interface ITextHover { /** * Returns the information which should be presented when a hover popup is shown * for the specified hover region. The hover region has the same semantics * as the region returned bygetHoverRegion
. If the returned
* information is null
or empty no hover popup will be shown.
*
* @param textViewer the viewer on which the hover popup should be shown
* @param hoverRegion the text range in the viewer which is used to determine
* the hover display information
* @return the hover popup display information, or null
if none available
* @deprecated As of 3.4, replaced by {@link ITextHoverExtension2#getHoverInfo2(ITextViewer, IRegion)}
*/
@Deprecated
String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion);
/**
* Returns the text region which should serve as the source of information
* to compute the hover popup display information. The popup has been requested
* for the given offset.* For example, if hover information can be provided on a per method basis in a * source viewer, the offset should be used to find the enclosing method and the * source range of the method should be returned. * * @param textViewer the viewer on which the hover popup should be shown * @param offset the offset for which the hover request has been issued * @return the hover region used to compute the hover display information */ IRegion getHoverRegion(ITextViewer textViewer, int offset); }