Skip to main content
summaryrefslogtreecommitdiffstats
blob: 7f800770c47e8a43286f6079bd3f458bb1bb6914 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/*******************************************************************************
 * Copyright (c) 2000, 2016 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.contentassist;

import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;

import org.eclipse.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 org.eclipse.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 org.eclipse.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 org.eclipse.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 org.eclipse.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 org.eclipse.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 org.eclipse.jface.text.contentassist.ICompletionProposalExtension6} since version 3.4 introducing
 *		the following function:
 *			<ul>
 *				<li>Allow styled ranges in the display string.</li>
 *			</ul>
 * </li>
 * <li>{@link org.eclipse.jface.text.contentassist.ICompletionProposalExtension7} since version 3.11 introducing
 *		the following function:
 *			<ul>
 *				<li>Emphasize ranges in the styled display string of the proposal that match the token at the
 *				current caret offset.</li>
 *			</ul>
 * </li>
 * </ul>
 * </p>
 * <p>
 * This interface can be implemented by clients. By default, clients use
 * {@link org.eclipse.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
	 *
	 * @see ICompletionProposalExtension6#getStyledDisplayString()
	 * @see ICompletionProposalExtension7#getStyledDisplayString(IDocument, int, BoldStylerProvider)
	 */
	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();
}

Back to the top