| /******************************************************************************* |
| * Copyright (c) 2000, 2007 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * 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 {@link org.eclipse.jface.text.ITextViewer} 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 tool tip 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 |
| * {@link org.eclipse.jface.text.contentassist.IContentAssistProcessor} 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> |
| * <p> |
| * In order to provide backward compatibility for clients of <code>IContentAssistant</code>, |
| * extension interfaces are used to provide a means of evolution. The following extension interfaces |
| * exist: |
| * </p> |
| * <ul> |
| * <li>{@link org.eclipse.jface.text.contentassist.IContentAssistantExtension} since version 3.0 |
| * introducing the following functions: |
| * <ul> |
| * <li>handle documents with multiple partitions</li> |
| * <li>insertion of common completion prefixes</li> |
| * </ul> |
| * </li> |
| * <li>{@link org.eclipse.jface.text.contentassist.IContentAssistantExtension2} since version 3.2 |
| * introducing the following functions: |
| * <ul> |
| * <li>repeated invocation (cycling) mode</li> |
| * <li>completion listeners</li> |
| * <li>a local status line for the completion popup</li> |
| * <li>control over the behavior when no proposals are available</li> |
| * </ul> |
| * </li> |
| * <li>{@link org.eclipse.jface.text.contentassist.IContentAssistantExtension3} since version 3.2 |
| * introducing the following function: |
| * <ul> |
| * <li>a key-sequence to listen for in repeated invocation mode</li> |
| * </ul> |
| * </li> |
| * <li>{@link org.eclipse.jface.text.contentassist.IContentAssistantExtension4} since version 3.4 |
| * introducing the following function: |
| * <ul> |
| * <li>allows to get a handler for the given command identifier</li> |
| * </ul> |
| * </li> |
| * </ul> |
| * |
| * <p> |
| * The interface can be implemented by clients. By default, clients use |
| * {@link org.eclipse.jface.text.contentassist.ContentAssistant} as the standard implementer of this |
| * interface. |
| * </p> |
| * |
| * @see org.eclipse.jface.text.ITextViewer |
| * @see org.eclipse.jface.text.contentassist.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); |
| } |