author | aghaisas |
Mon, 10 Jul 2017 14:55:29 +0530 | |
changeset 47151 | 362dcbee0613 |
parent 25859 | 3317bb8137f4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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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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* An interface that provides information to a scrolling container |
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* like JScrollPane. A complex component that's likely to be used |
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* as a viewing a JScrollPane viewport (or other scrolling container) |
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* should implement this interface. |
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* |
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* @see JViewport |
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* @see JScrollPane |
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* @see JScrollBar |
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* @author Hans Muller |
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25201
4adc75e0c4e5
8046485: Add missing @since tag under javax.swing.*
henryjen
parents:
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diff
changeset
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* @since 1.2 |
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*/ |
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public interface Scrollable |
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{ |
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/** |
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* Returns the preferred size of the viewport for a view component. |
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* For example, the preferred size of a <code>JList</code> component |
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* is the size required to accommodate all of the cells in its list. |
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* However, the value of <code>preferredScrollableViewportSize</code> |
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* is the size required for <code>JList.getVisibleRowCount</code> rows. |
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* A component without any properties that would affect the viewport |
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* size should just return <code>getPreferredSize</code> here. |
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* |
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* @return the preferredSize of a <code>JViewport</code> whose view |
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* is this <code>Scrollable</code> |
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* @see JViewport#getPreferredSize |
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*/ |
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Dimension getPreferredScrollableViewportSize(); |
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/** |
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* Components that display logical rows or columns should compute |
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* the scroll increment that will completely expose one new row |
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* or column, depending on the value of orientation. Ideally, |
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* components should handle a partially exposed row or column by |
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* returning the distance required to completely expose the item. |
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* <p> |
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* Scrolling containers, like JScrollPane, will use this method |
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* each time the user requests a unit scroll. |
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* |
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* @param visibleRect The view area visible within the viewport |
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* @param orientation Either SwingConstants.VERTICAL or SwingConstants.HORIZONTAL. |
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* @param direction Less than zero to scroll up/left, greater than zero for down/right. |
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* @return The "unit" increment for scrolling in the specified direction. |
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* This value should always be positive. |
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* @see JScrollBar#setUnitIncrement |
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*/ |
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int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction); |
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/** |
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* Components that display logical rows or columns should compute |
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* the scroll increment that will completely expose one block |
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* of rows or columns, depending on the value of orientation. |
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* <p> |
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* Scrolling containers, like JScrollPane, will use this method |
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* each time the user requests a block scroll. |
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* |
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* @param visibleRect The view area visible within the viewport |
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* @param orientation Either SwingConstants.VERTICAL or SwingConstants.HORIZONTAL. |
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* @param direction Less than zero to scroll up/left, greater than zero for down/right. |
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* @return The "block" increment for scrolling in the specified direction. |
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* This value should always be positive. |
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* @see JScrollBar#setBlockIncrement |
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*/ |
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int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction); |
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/** |
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* Return true if a viewport should always force the width of this |
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* <code>Scrollable</code> to match the width of the viewport. |
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* For example a normal |
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* text view that supported line wrapping would return true here, since it |
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* would be undesirable for wrapped lines to disappear beyond the right |
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* edge of the viewport. Note that returning true for a Scrollable |
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* whose ancestor is a JScrollPane effectively disables horizontal |
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* scrolling. |
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* <p> |
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* Scrolling containers, like JViewport, will use this method each |
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* time they are validated. |
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* |
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* @return True if a viewport should force the Scrollables width to match its own. |
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*/ |
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boolean getScrollableTracksViewportWidth(); |
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/** |
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* Return true if a viewport should always force the height of this |
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* Scrollable to match the height of the viewport. For example a |
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* columnar text view that flowed text in left to right columns |
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* could effectively disable vertical scrolling by returning |
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* true here. |
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* <p> |
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* Scrolling containers, like JViewport, will use this method each |
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* time they are validated. |
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* |
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* @return True if a viewport should force the Scrollables height to match its own. |
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*/ |
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boolean getScrollableTracksViewportHeight(); |
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} |