2 Copyright (C) 2002, 2004 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
40 import java.awt.Dimension;
41 import java.awt.Rectangle;
44 * Defines the method that a component should implement to behave nicely
45 * in {@link JScrollPane}s. Note that this is not required for a component
46 * to be used in a <code>JScrollPane</code>, but can highly improve the
47 * user experience when scrolling the component.
49 public interface Scrollable
51 Dimension getPreferredScrollableViewportSize();
54 * Return the preferred scrolling amount (in pixels) for the given
55 * scrolling direction and orientation when scrolling in small amounts
58 * @param visibleRect the currently visible part of the component.
59 * @param orientation the scrolling orientation
60 * @param direction the scrolling direction (negative - up, positive -down).
61 * The values greater than one means that more mouse wheel or similar
62 * events were generated, and hence it is better to scroll the longer
65 * @return the preferred scrolling distance, negative if up or left.
67 int getScrollableUnitIncrement(Rectangle visibleRect, int orientation,
71 * Return the preferred scrolling amount (in pixels) for the given
72 * scrolling direction and orientation when scrolling in large amounts
75 * @param visibleRect the currently visible part of the component.
76 * @param orientation the scrolling orientation
77 * @param direction the scrolling direction (negative - up, positive -down).
78 * The values greater than one means that more mouse wheel or similar
79 * events were generated, and hence it is better to scroll the longer
82 * @return the preferred scrolling distance, negative if up or left.
84 int getScrollableBlockIncrement(Rectangle visibleRect, int orientation,
88 * Return true if the width of the scrollable is always equal to the
89 * view, where it is displayed, width (for instance, the text area with
90 * the word wrap). In such case, the horizontal scrolling should not be
93 * @return true is no horizontal scrolling is assumed, faster otherwise.
95 boolean getScrollableTracksViewportWidth();
98 * Return true if the height of the scrollable is always equal to the view,
99 * where it is displayed, height.In such case, the vertical scrolling should
102 * @return true is no horizontal scrolling is assumed, faster otherwise.
104 boolean getScrollableTracksViewportHeight();