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jeremybenn |
/* Scrollable.java --
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Copyright (C) 2002, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing;
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import java.awt.Dimension;
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import java.awt.Rectangle;
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/**
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* Defines the method that a component should implement to behave nicely
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* in {@link JScrollPane}s. Note that this is not required for a component
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* to be used in a <code>JScrollPane</code>, but can highly improve the
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* user experience when scrolling the component.
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*/
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public interface Scrollable
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{
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Dimension getPreferredScrollableViewportSize();
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/**
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* Return the preferred scrolling amount (in pixels) for the given
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* scrolling direction and orientation when scrolling in small amounts
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* like table lines.
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*
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* @param visibleRect the currently visible part of the component.
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* @param orientation the scrolling orientation
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* @param direction the scrolling direction (negative - up, positive -down).
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* The values greater than one means that more mouse wheel or similar
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* events were generated, and hence it is better to scroll the longer
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* distance.
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*
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* @return the preferred scrolling distance, negative if up or left.
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*/
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int getScrollableUnitIncrement(Rectangle visibleRect, int orientation,
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int direction);
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/**
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* Return the preferred scrolling amount (in pixels) for the given
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* scrolling direction and orientation when scrolling in large amounts
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* (pages).
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*
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* @param visibleRect the currently visible part of the component.
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* @param orientation the scrolling orientation
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* @param direction the scrolling direction (negative - up, positive -down).
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* The values greater than one means that more mouse wheel or similar
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* events were generated, and hence it is better to scroll the longer
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* distance.
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*
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* @return the preferred scrolling distance, negative if up or left.
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*/
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int getScrollableBlockIncrement(Rectangle visibleRect, int orientation,
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int direction);
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/**
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* Return true if the width of the scrollable is always equal to the
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* view, where it is displayed, width (for instance, the text area with
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* the word wrap). In such case, the horizontal scrolling should not be
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* performed.
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*
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* @return true is no horizontal scrolling is assumed, faster otherwise.
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*/
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boolean getScrollableTracksViewportWidth();
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/**
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* Return true if the height of the scrollable is always equal to the view,
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* where it is displayed, height.In such case, the vertical scrolling should
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* not be performed.
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*
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* @return true is no horizontal scrolling is assumed, faster otherwise.
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*/
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boolean getScrollableTracksViewportHeight();
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}
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