/*******************************************************************************
 * 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
 * Port to the D programming language:
 *     Frank Benoit <benoit@tionex.de>
 *******************************************************************************/
module dwtx.jface.text.contentassist.ICompletionProposal;

import dwtx.jface.text.contentassist.ContentAssistEvent; // packageimport
import dwtx.jface.text.contentassist.Helper; // packageimport
import dwtx.jface.text.contentassist.PopupCloser; // packageimport
import dwtx.jface.text.contentassist.IContentAssistant; // packageimport
import dwtx.jface.text.contentassist.CompletionProposal; // packageimport
import dwtx.jface.text.contentassist.ICompletionProposalExtension5; // packageimport
import dwtx.jface.text.contentassist.IContextInformationValidator; // packageimport
import dwtx.jface.text.contentassist.IContentAssistListener; // packageimport
import dwtx.jface.text.contentassist.ICompletionProposalExtension6; // packageimport
import dwtx.jface.text.contentassist.ICompletionListener; // packageimport
import dwtx.jface.text.contentassist.ICompletionProposalExtension2; // packageimport
import dwtx.jface.text.contentassist.IContentAssistantExtension4; // packageimport
import dwtx.jface.text.contentassist.ContextInformation; // packageimport
import dwtx.jface.text.contentassist.ICompletionProposalExtension3; // packageimport
import dwtx.jface.text.contentassist.ContextInformationValidator; // packageimport
import dwtx.jface.text.contentassist.IContentAssistProcessor; // packageimport
import dwtx.jface.text.contentassist.AdditionalInfoController; // packageimport
import dwtx.jface.text.contentassist.IContextInformationPresenter; // packageimport
import dwtx.jface.text.contentassist.ICompletionProposalExtension4; // packageimport
import dwtx.jface.text.contentassist.ICompletionListenerExtension; // packageimport
import dwtx.jface.text.contentassist.ContextInformationPopup; // packageimport
import dwtx.jface.text.contentassist.IContextInformationExtension; // packageimport
import dwtx.jface.text.contentassist.IContentAssistantExtension2; // packageimport
import dwtx.jface.text.contentassist.ContentAssistSubjectControlAdapter; // packageimport
import dwtx.jface.text.contentassist.CompletionProposalPopup; // packageimport
import dwtx.jface.text.contentassist.ICompletionProposalExtension; // packageimport
import dwtx.jface.text.contentassist.IContextInformation; // packageimport
import dwtx.jface.text.contentassist.IContentAssistantExtension3; // packageimport
import dwtx.jface.text.contentassist.ContentAssistant; // packageimport
import dwtx.jface.text.contentassist.IContentAssistantExtension; // packageimport
import dwtx.jface.text.contentassist.JFaceTextMessages; // packageimport


import dwt.dwthelper.utils;



import dwt.graphics.Image;
import dwt.graphics.Point;
import dwtx.jface.text.IDocument;


/**
 * The interface of completion proposals generated by content assist processors.
 * A completion proposal contains information used to present the proposed completion
 * to the user, to insert the completion should the user select it, and to present
 * context information for the chosen completion once it has been inserted.
 * <p>
 * In order to provide backward compatibility for clients of <code>ICompletionProposal</code>, extension
 * interfaces are used to provide a means of evolution. The following extension interfaces exist:
 * <ul>
 * <li>{@link dwtx.jface.text.contentassist.ICompletionProposalExtension} since version 2.0 introducing
 *      the following functions:
 *          <ul>
 *              <li>handling of trigger characters other than ENTER</li>
 *              <li>completion proposal validation for a given offset</li>
 *              <li>context information can be freely positioned</li>
 *          </ul>
 * </li>
 * <li>{@link dwtx.jface.text.contentassist.ICompletionProposalExtension2} since version 2.1 introducing
 *      the following functions:
 *          <ul>
 *              <li>handling of trigger characters with modifiers</li>
 *              <li>visual indication for selection of a proposal</li>
 *          </ul>
 * </li>
 * <li>{@link dwtx.jface.text.contentassist.ICompletionProposalExtension3} since version 3.0 introducing
 *      the following functions:
 *          <ul>
 *              <li>provision of a custom information control creator</li>
 *              <li>provide a custom completion text and offset for prefix completion</li>
 *          </ul>
 * </li>
 * <li>{@link dwtx.jface.text.contentassist.ICompletionProposalExtension4} since version 3.1 introducing
 *      the following functions:
 *          <ul>
 *              <li>specify whether a proposal is automatically insertable</li>
 *          </ul>
 * </li>
 * <li>{@link dwtx.jface.text.contentassist.ICompletionProposalExtension5} since version 3.2 introducing
 *      the following function:
 *          <ul>
 *              <li>Allow background computation of the additional info</li>
 *          </ul>
 * </li>
 * <li>{@link dwtx.jface.text.contentassist.ICompletionProposalExtension6} since version 3.4 introducing
 *      the following function:
 *          <ul>
 *              <li>Allow styled ranges in the display string.</li>
 *          </ul>
 * </li>
 * </ul>
 * </p>
 * <p>
 * This interface can be implemented by clients. By default, clients use
 * {@link dwtx.jface.text.contentassist.CompletionProposal} as the
 * standard implementer of this interface.
 * </p>
 *
 * @see IContentAssistProcessor
 */
public interface ICompletionProposal {

    /**
     * Inserts the proposed completion into the given document.
     *
     * @param document the document into which to insert the proposed completion
     */
    void apply(IDocument document);

    /**
     * Returns the new selection after the proposal has been applied to
     * the given document in absolute document coordinates. If it returns
     * <code>null</code>, no new selection is set.
     *
     * A document change can trigger other document changes, which have
     * to be taken into account when calculating the new selection. Typically,
     * this would be done by installing a document listener or by using a
     * document position during {@link #apply(IDocument)}.
     *
     * @param document the document into which the proposed completion has been inserted
     * @return the new selection in absolute document coordinates
     */
    Point getSelection(IDocument document);

    /**
     * Returns optional additional information about the proposal. The additional information will
     * be presented to assist the user in deciding if the selected proposal is the desired choice.
     * <p>
     * If {@link ICompletionProposalExtension5} is implemented, this method should not be called any
     * longer. This method may be deprecated in a future release.
     * </p>
     * 
     * @return the additional information or <code>null</code>
     */
    String getAdditionalProposalInfo();

    /**
     * Returns the string to be displayed in the list of completion proposals.
     *
     * @return the string to be displayed
     */
    String getDisplayString();

    /**
     * Returns the image to be displayed in the list of completion proposals.
     * The image would typically be shown to the left of the display string.
     *
     * @return the image to be shown or <code>null</code> if no image is desired
     */
    Image getImage();

    /**
     * Returns optional context information associated with this proposal.
     * The context information will automatically be shown if the proposal
     * has been applied.
     *
     * @return the context information for this proposal or <code>null</code>
     */
    IContextInformation getContextInformation();
}