| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jface.text.contentassist; |
| |
| |
| import org.eclipse.jface.text.ITextViewer; |
| |
| |
| /** |
| * An <code>IContentAssistant</code> provides support on interactive content completion. |
| * The content assistant is a <code>ITextViewer</code> add-on. Its |
| * purpose is to propose, display, and insert completions of the content |
| * of the text viewer's document at the viewer's cursor position. In addition |
| * to handle completions, a content assistant can also be requested to provide |
| * context information. Context information is shown in a tooltip like popup. |
| * As it is not always possible to determine the exact context at a given |
| * document offset, a content assistant displays the possible contexts and requests |
| * the user to choose the one whose information should be displayed.<p> |
| * A content assistant has a list of <code>IContentAssistProcessor</code> |
| * objects each of which is registered for a particular document content |
| * type. The content assistant uses the processors to react on the request |
| * of completing documents or presenting context information.<p> |
| * The interface can be implemented by clients. By default, clients use |
| * <code>ContentAssistant</code> as the standard implementer of this interface. |
| * |
| * @see ITextViewer |
| * @see IContentAssistProcessor |
| */ |
| |
| public interface IContentAssistant { |
| |
| //------ proposal popup orientation styles ------------ |
| /** The context info list will overlay the list of completion proposals. */ |
| public final static int PROPOSAL_OVERLAY= 10; |
| /** The completion proposal list will be removed before the context info list will be shown. */ |
| public final static int PROPOSAL_REMOVE= 11; |
| /** The context info list will be presented without hiding or overlapping the completion proposal list. */ |
| public final static int PROPOSAL_STACKED= 12; |
| |
| //------ context info box orientation styles ---------- |
| /** Context info will be shown above the location it has been requested for without hiding the location. */ |
| public final static int CONTEXT_INFO_ABOVE= 20; |
| /** Context info will be shown below the location it has been requested for without hiding the location. */ |
| public final static int CONTEXT_INFO_BELOW= 21; |
| |
| |
| /** |
| * Installs content assist support on the given text viewer. |
| * |
| * @param textViewer the text viewer on which content assist will work |
| */ |
| void install(ITextViewer textViewer); |
| |
| /** |
| * Uninstalls content assist support from the text viewer it has |
| * previously be installed on. |
| */ |
| void uninstall(); |
| |
| /** |
| * Shows all possible completions of the content at the viewer's cursor position. |
| * |
| * @return an optional error message if no proposals can be computed |
| */ |
| String showPossibleCompletions(); |
| |
| /** |
| * Shows context information for the content at the viewer's cursor position. |
| * |
| * @return an optional error message if no context information can be computed |
| */ |
| String showContextInformation(); |
| |
| /** |
| * Returns the content assist processor to be used for the given content type. |
| * |
| * @param contentType the type of the content for which this |
| * content assistant is to be requested |
| * @return an instance content assist processor or |
| * <code>null</code> if none exists for the specified content type |
| */ |
| IContentAssistProcessor getContentAssistProcessor(String contentType); |
| } |