| /******************************************************************************* |
| * 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. |
| * <p> |
| * |
| * In order to provide backward compatibility for clients of |
| * <code>ITextHover</code>, extension interfaces are used as a means of |
| * evolution. The following extension interfaces exist: |
| * <ul> |
| * <li>{@link org.eclipse.jface.text.ITextHoverExtension} since version 3.0 |
| * allowing a text hover to provide a creator for the hover control. This allows |
| * for sophisticated hovers in a way that information computed by the hover can |
| * be displayed in the best possible form.</li> |
| * <li>{@link org.eclipse.jface.text.ITextHoverExtension2} since version 3.4 |
| * allowing a text hover to return hover-specific information objects.</li> |
| * </ul></p> |
| * <p> |
| * Clients may implement this interface.</p> |
| * |
| * @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 by <code>getHoverRegion</code>. If the returned |
| * information is <code>null</code> 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 <code>null</code> 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.<p> |
| * 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); |
| } |