1 /*
2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package javax.swing.text;
26
27
28 /**
29 * Interface for <code>View</code>s that have size dependent upon tabs.
30 *
31 * @author Timothy Prinzing
32 * @author Scott Violet
33 * @see TabExpander
34 * @see LabelView
35 * @see ParagraphView
36 */
37 public interface TabableView {
38
39 /**
40 * Determines the desired span when using the given
41 * tab expansion implementation. If a container
42 * calls this method, it will do so prior to the
43 * normal layout which would call getPreferredSpan.
44 * A view implementing this should give the same
45 * result in any subsequent calls to getPreferredSpan
46 * along the axis of tab expansion.
47 *
48 * @param x the position the view would be located
49 * at for the purpose of tab expansion >= 0.
50 * @param e how to expand the tabs when encountered.
51 * @return the desired span >= 0
52 */
53 float getTabbedSpan(float x, TabExpander e);
54
55 /**
56 * Determines the span along the same axis as tab
57 * expansion for a portion of the view. This is
58 * intended for use by the TabExpander for cases
59 * where the tab expansion involves aligning the
60 * portion of text that doesn't have whitespace
61 * relative to the tab stop. There is therefore
62 * an assumption that the range given does not
63 * contain tabs.
64 *
65 * @param p0 the starting location in the text document >= 0
66 * @param p1 the ending location in the text document >= p0
67 * @return the span >= 0
68 */
69 float getPartialSpan(int p0, int p1);
70 }
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