author | malenkov |
Wed, 30 Apr 2014 19:28:05 +0400 | |
changeset 24544 | c0133e7c7162 |
parent 22574 | 7f8ce0c8c20a |
child 25201 | 4adc75e0c4e5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2013, 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.*; |
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import java.awt.event.*; |
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import javax.swing.text.*; |
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import javax.swing.plaf.*; |
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import javax.accessibility.*; |
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import java.util.Collections; |
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import java.util.Set; |
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import java.util.StringTokenizer; |
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import java.io.ObjectOutputStream; |
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import java.io.ObjectInputStream; |
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import java.io.IOException; |
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/** |
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* A <code>JTextArea</code> is a multi-line area that displays plain text. |
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* It is intended to be a lightweight component that provides source |
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* compatibility with the <code>java.awt.TextArea</code> class where it can |
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* reasonably do so. |
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* You can find information and examples of using all the text components in |
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* <a href="http://docs.oracle.com/javase/tutorial/uiswing/components/text.html">Using Text Components</a>, |
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* a section in <em>The Java Tutorial.</em> |
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* |
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* <p> |
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* This component has capabilities not found in the |
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* <code>java.awt.TextArea</code> class. The superclass should be |
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* consulted for additional capabilities. |
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* Alternative multi-line text classes with |
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* more capabilities are <code>JTextPane</code> and <code>JEditorPane</code>. |
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* <p> |
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* The <code>java.awt.TextArea</code> internally handles scrolling. |
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* <code>JTextArea</code> is different in that it doesn't manage scrolling, |
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* but implements the swing <code>Scrollable</code> interface. This allows it |
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* to be placed inside a <code>JScrollPane</code> if scrolling |
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* behavior is desired, and used directly if scrolling is not desired. |
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* <p> |
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* The <code>java.awt.TextArea</code> has the ability to do line wrapping. |
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* This was controlled by the horizontal scrolling policy. Since |
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* scrolling is not done by <code>JTextArea</code> directly, backward |
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* compatibility must be provided another way. <code>JTextArea</code> has |
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* a bound property for line wrapping that controls whether or |
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* not it will wrap lines. By default, the line wrapping property |
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* is set to false (not wrapped). |
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* <p> |
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* <code>java.awt.TextArea</code> has two properties <code>rows</code> |
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* and <code>columns</code> that are used to determine the preferred size. |
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* <code>JTextArea</code> uses these properties to indicate the |
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* preferred size of the viewport when placed inside a <code>JScrollPane</code> |
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* to match the functionality provided by <code>java.awt.TextArea</code>. |
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* <code>JTextArea</code> has a preferred size of what is needed to |
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* display all of the text, so that it functions properly inside of |
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* a <code>JScrollPane</code>. If the value for <code>rows</code> |
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* or <code>columns</code> is equal to zero, |
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* the preferred size along that axis is used for |
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* the viewport preferred size along the same axis. |
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* <p> |
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* The <code>java.awt.TextArea</code> could be monitored for changes by adding |
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* a <code>TextListener</code> for <code>TextEvent</code>s. |
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* In the <code>JTextComponent</code> based |
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* components, changes are broadcasted from the model via a |
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* <code>DocumentEvent</code> to <code>DocumentListeners</code>. |
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* The <code>DocumentEvent</code> gives |
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* the location of the change and the kind of change if desired. |
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* The code fragment might look something like: |
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* <pre> |
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* DocumentListener myListener = ??; |
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* JTextArea myArea = ??; |
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* myArea.getDocument().addDocumentListener(myListener); |
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* </pre> |
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* |
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* <dl> |
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* <dt><b>Newlines</b> |
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* <dd> |
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* For a discussion on how newlines are handled, see |
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* <a href="text/DefaultEditorKit.html">DefaultEditorKit</a>. |
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* </dl> |
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* |
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* <p> |
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* <strong>Warning:</strong> Swing is not thread safe. For more |
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* information see <a |
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* href="package-summary.html#threading">Swing's Threading |
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* Policy</a>. |
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* <p> |
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* <strong>Warning:</strong> |
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* Serialized objects of this class will not be compatible with |
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* future Swing releases. The current serialization support is |
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* appropriate for short term storage or RMI between applications running |
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* the same version of Swing. As of 1.4, support for long term storage |
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* of all JavaBeans™ |
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* has been added to the <code>java.beans</code> package. |
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* Please see {@link java.beans.XMLEncoder}. |
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* |
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* @beaninfo |
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* attribute: isContainer false |
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* description: A multi-line area that displays plain text. |
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* |
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* @author Timothy Prinzing |
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* @see JTextPane |
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* @see JEditorPane |
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*/ |
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@SuppressWarnings("serial") // Same-version serialization only |
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public class JTextArea extends JTextComponent { |
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/** |
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* @see #getUIClassID |
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* @see #readObject |
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*/ |
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private static final String uiClassID = "TextAreaUI"; |
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/** |
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* Constructs a new TextArea. A default model is set, the initial string |
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* is null, and rows/columns are set to 0. |
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*/ |
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public JTextArea() { |
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this(null, null, 0, 0); |
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} |
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/** |
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* Constructs a new TextArea with the specified text displayed. |
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* A default model is created and rows/columns are set to 0. |
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* |
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* @param text the text to be displayed, or null |
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*/ |
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public JTextArea(String text) { |
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this(null, text, 0, 0); |
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} |
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/** |
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* Constructs a new empty TextArea with the specified number of |
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* rows and columns. A default model is created, and the initial |
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* string is null. |
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* |
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* @param rows the number of rows >= 0 |
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* @param columns the number of columns >= 0 |
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* @exception IllegalArgumentException if the rows or columns |
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* arguments are negative. |
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*/ |
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public JTextArea(int rows, int columns) { |
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this(null, null, rows, columns); |
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} |
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/** |
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* Constructs a new TextArea with the specified text and number |
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* of rows and columns. A default model is created. |
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* |
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* @param text the text to be displayed, or null |
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* @param rows the number of rows >= 0 |
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* @param columns the number of columns >= 0 |
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* @exception IllegalArgumentException if the rows or columns |
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* arguments are negative. |
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*/ |
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public JTextArea(String text, int rows, int columns) { |
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this(null, text, rows, columns); |
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} |
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/** |
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* Constructs a new JTextArea with the given document model, and defaults |
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* for all of the other arguments (null, 0, 0). |
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* |
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* @param doc the model to use |
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*/ |
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public JTextArea(Document doc) { |
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this(doc, null, 0, 0); |
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} |
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/** |
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* Constructs a new JTextArea with the specified number of rows |
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* and columns, and the given model. All of the constructors |
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* feed through this constructor. |
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* |
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* @param doc the model to use, or create a default one if null |
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* @param text the text to be displayed, null if none |
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* @param rows the number of rows >= 0 |
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* @param columns the number of columns >= 0 |
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* @exception IllegalArgumentException if the rows or columns |
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* arguments are negative. |
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*/ |
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public JTextArea(Document doc, String text, int rows, int columns) { |
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super(); |
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this.rows = rows; |
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this.columns = columns; |
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if (doc == null) { |
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doc = createDefaultModel(); |
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} |
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setDocument(doc); |
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if (text != null) { |
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setText(text); |
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select(0, 0); |
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} |
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if (rows < 0) { |
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throw new IllegalArgumentException("rows: " + rows); |
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} |
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if (columns < 0) { |
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throw new IllegalArgumentException("columns: " + columns); |
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} |
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LookAndFeel.installProperty(this, |
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"focusTraversalKeysForward", |
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JComponent. |
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getManagingFocusForwardTraversalKeys()); |
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LookAndFeel.installProperty(this, |
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"focusTraversalKeysBackward", |
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JComponent. |
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getManagingFocusBackwardTraversalKeys()); |
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} |
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/** |
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* Returns the class ID for the UI. |
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* |
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* @return the ID ("TextAreaUI") |
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* @see JComponent#getUIClassID |
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* @see UIDefaults#getUI |
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*/ |
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public String getUIClassID() { |
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return uiClassID; |
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} |
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/** |
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* Creates the default implementation of the model |
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* to be used at construction if one isn't explicitly |
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* given. A new instance of PlainDocument is returned. |
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* |
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* @return the default document model |
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*/ |
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protected Document createDefaultModel() { |
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return new PlainDocument(); |
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} |
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/** |
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* Sets the number of characters to expand tabs to. |
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* This will be multiplied by the maximum advance for |
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* variable width fonts. A PropertyChange event ("tabSize") is fired |
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* when the tab size changes. |
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* |
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* @param size number of characters to expand to |
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* @see #getTabSize |
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* @beaninfo |
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* preferred: true |
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* bound: true |
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* description: the number of characters to expand tabs to |
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*/ |
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public void setTabSize(int size) { |
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Document doc = getDocument(); |
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if (doc != null) { |
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int old = getTabSize(); |
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doc.putProperty(PlainDocument.tabSizeAttribute, Integer.valueOf(size)); |
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firePropertyChange("tabSize", old, size); |
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} |
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} |
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/** |
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* Gets the number of characters used to expand tabs. If the document is |
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* null or doesn't have a tab setting, return a default of 8. |
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* |
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* @return the number of characters |
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*/ |
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public int getTabSize() { |
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int size = 8; |
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Document doc = getDocument(); |
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if (doc != null) { |
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Integer i = (Integer) doc.getProperty(PlainDocument.tabSizeAttribute); |
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if (i != null) { |
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size = i.intValue(); |
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} |
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} |
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return size; |
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} |
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/** |
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* Sets the line-wrapping policy of the text area. If set |
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* to true the lines will be wrapped if they are too long |
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* to fit within the allocated width. If set to false, |
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* the lines will always be unwrapped. A <code>PropertyChange</code> |
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* event ("lineWrap") is fired when the policy is changed. |
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* By default this property is false. |
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* |
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* @param wrap indicates if lines should be wrapped |
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* @see #getLineWrap |
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* @beaninfo |
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* preferred: true |
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* bound: true |
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* description: should lines be wrapped |
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*/ |
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public void setLineWrap(boolean wrap) { |
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boolean old = this.wrap; |
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this.wrap = wrap; |
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firePropertyChange("lineWrap", old, wrap); |
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} |
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/** |
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* Gets the line-wrapping policy of the text area. If set |
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* to true the lines will be wrapped if they are too long |
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* to fit within the allocated width. If set to false, |
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* the lines will always be unwrapped. |
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* |
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* @return if lines will be wrapped |
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*/ |
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public boolean getLineWrap() { |
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return wrap; |
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} |
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/** |
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* Sets the style of wrapping used if the text area is wrapping |
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* lines. If set to true the lines will be wrapped at word |
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* boundaries (whitespace) if they are too long |
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* to fit within the allocated width. If set to false, |
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* the lines will be wrapped at character boundaries. |
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* By default this property is false. |
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* |
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* @param word indicates if word boundaries should be used |
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* for line wrapping |
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* @see #getWrapStyleWord |
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* @beaninfo |
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* preferred: false |
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* bound: true |
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* description: should wrapping occur at word boundaries |
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*/ |
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public void setWrapStyleWord(boolean word) { |
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boolean old = this.word; |
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this.word = word; |
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firePropertyChange("wrapStyleWord", old, word); |
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} |
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/** |
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* Gets the style of wrapping used if the text area is wrapping |
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* lines. If set to true the lines will be wrapped at word |
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* boundaries (ie whitespace) if they are too long |
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* to fit within the allocated width. If set to false, |
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* the lines will be wrapped at character boundaries. |
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* |
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* @return if the wrap style should be word boundaries |
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* instead of character boundaries |
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* @see #setWrapStyleWord |
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359 |
*/ |
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360 |
public boolean getWrapStyleWord() { |
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361 |
return word; |
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} |
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/** |
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* Translates an offset into the components text to a |
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* line number. |
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* |
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* @param offset the offset >= 0 |
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* @return the line number >= 0 |
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* @exception BadLocationException thrown if the offset is |
371 |
* less than zero or greater than the document length. |
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*/ |
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373 |
public int getLineOfOffset(int offset) throws BadLocationException { |
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Document doc = getDocument(); |
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if (offset < 0) { |
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throw new BadLocationException("Can't translate offset to line", -1); |
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} else if (offset > doc.getLength()) { |
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throw new BadLocationException("Can't translate offset to line", doc.getLength()+1); |
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} else { |
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Element map = getDocument().getDefaultRootElement(); |
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return map.getElementIndex(offset); |
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} |
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} |
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/** |
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* Determines the number of lines contained in the area. |
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* |
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* @return the number of lines > 0 |
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*/ |
390 |
public int getLineCount() { |
|
391 |
Element map = getDocument().getDefaultRootElement(); |
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return map.getElementCount(); |
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} |
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/** |
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* Determines the offset of the start of the given line. |
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* |
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* @param line the line number to translate >= 0 |
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* @return the offset >= 0 |
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* @exception BadLocationException thrown if the line is |
401 |
* less than zero or greater or equal to the number of |
|
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* lines contained in the document (as reported by |
|
403 |
* getLineCount). |
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*/ |
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405 |
public int getLineStartOffset(int line) throws BadLocationException { |
|
406 |
int lineCount = getLineCount(); |
|
407 |
if (line < 0) { |
|
408 |
throw new BadLocationException("Negative line", -1); |
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409 |
} else if (line >= lineCount) { |
|
410 |
throw new BadLocationException("No such line", getDocument().getLength()+1); |
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411 |
} else { |
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412 |
Element map = getDocument().getDefaultRootElement(); |
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413 |
Element lineElem = map.getElement(line); |
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return lineElem.getStartOffset(); |
|
415 |
} |
|
416 |
} |
|
417 |
||
418 |
/** |
|
419 |
* Determines the offset of the end of the given line. |
|
420 |
* |
|
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|
421 |
* @param line the line >= 0 |
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|
422 |
* @return the offset >= 0 |
2 | 423 |
* @exception BadLocationException Thrown if the line is |
424 |
* less than zero or greater or equal to the number of |
|
425 |
* lines contained in the document (as reported by |
|
426 |
* getLineCount). |
|
427 |
*/ |
|
428 |
public int getLineEndOffset(int line) throws BadLocationException { |
|
429 |
int lineCount = getLineCount(); |
|
430 |
if (line < 0) { |
|
431 |
throw new BadLocationException("Negative line", -1); |
|
432 |
} else if (line >= lineCount) { |
|
433 |
throw new BadLocationException("No such line", getDocument().getLength()+1); |
|
434 |
} else { |
|
435 |
Element map = getDocument().getDefaultRootElement(); |
|
436 |
Element lineElem = map.getElement(line); |
|
437 |
int endOffset = lineElem.getEndOffset(); |
|
438 |
// hide the implicit break at the end of the document |
|
439 |
return ((line == lineCount - 1) ? (endOffset - 1) : endOffset); |
|
440 |
} |
|
441 |
} |
|
442 |
||
443 |
// --- java.awt.TextArea methods --------------------------------- |
|
444 |
||
445 |
/** |
|
446 |
* Inserts the specified text at the specified position. Does nothing |
|
447 |
* if the model is null or if the text is null or empty. |
|
448 |
* |
|
449 |
* @param str the text to insert |
|
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|
450 |
* @param pos the position at which to insert >= 0 |
2 | 451 |
* @exception IllegalArgumentException if pos is an |
452 |
* invalid position in the model |
|
453 |
* @see TextComponent#setText |
|
454 |
* @see #replaceRange |
|
455 |
*/ |
|
456 |
public void insert(String str, int pos) { |
|
457 |
Document doc = getDocument(); |
|
458 |
if (doc != null) { |
|
459 |
try { |
|
460 |
doc.insertString(pos, str, null); |
|
461 |
} catch (BadLocationException e) { |
|
462 |
throw new IllegalArgumentException(e.getMessage()); |
|
463 |
} |
|
464 |
} |
|
465 |
} |
|
466 |
||
467 |
/** |
|
468 |
* Appends the given text to the end of the document. Does nothing if |
|
469 |
* the model is null or the string is null or empty. |
|
470 |
* |
|
471 |
* @param str the text to insert |
|
472 |
* @see #insert |
|
473 |
*/ |
|
474 |
public void append(String str) { |
|
475 |
Document doc = getDocument(); |
|
476 |
if (doc != null) { |
|
477 |
try { |
|
478 |
doc.insertString(doc.getLength(), str, null); |
|
479 |
} catch (BadLocationException e) { |
|
480 |
} |
|
481 |
} |
|
482 |
} |
|
483 |
||
484 |
/** |
|
485 |
* Replaces text from the indicated start to end position with the |
|
486 |
* new text specified. Does nothing if the model is null. Simply |
|
487 |
* does a delete if the new string is null or empty. |
|
488 |
* |
|
489 |
* @param str the text to use as the replacement |
|
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|
490 |
* @param start the start position >= 0 |
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|
491 |
* @param end the end position >= start |
2 | 492 |
* @exception IllegalArgumentException if part of the range is an |
493 |
* invalid position in the model |
|
494 |
* @see #insert |
|
495 |
* @see #replaceRange |
|
496 |
*/ |
|
497 |
public void replaceRange(String str, int start, int end) { |
|
498 |
if (end < start) { |
|
499 |
throw new IllegalArgumentException("end before start"); |
|
500 |
} |
|
501 |
Document doc = getDocument(); |
|
502 |
if (doc != null) { |
|
503 |
try { |
|
504 |
if (doc instanceof AbstractDocument) { |
|
505 |
((AbstractDocument)doc).replace(start, end - start, str, |
|
506 |
null); |
|
507 |
} |
|
508 |
else { |
|
509 |
doc.remove(start, end - start); |
|
510 |
doc.insertString(start, str, null); |
|
511 |
} |
|
512 |
} catch (BadLocationException e) { |
|
513 |
throw new IllegalArgumentException(e.getMessage()); |
|
514 |
} |
|
515 |
} |
|
516 |
} |
|
517 |
||
518 |
/** |
|
519 |
* Returns the number of rows in the TextArea. |
|
520 |
* |
|
20157
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|
521 |
* @return the number of rows >= 0 |
2 | 522 |
*/ |
523 |
public int getRows() { |
|
524 |
return rows; |
|
525 |
} |
|
526 |
||
527 |
/** |
|
528 |
* Sets the number of rows for this TextArea. Calls invalidate() after |
|
529 |
* setting the new value. |
|
530 |
* |
|
20157
cafca01a8e28
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diff
changeset
|
531 |
* @param rows the number of rows >= 0 |
2 | 532 |
* @exception IllegalArgumentException if rows is less than 0 |
533 |
* @see #getRows |
|
534 |
* @beaninfo |
|
535 |
* description: the number of rows preferred for display |
|
536 |
*/ |
|
537 |
public void setRows(int rows) { |
|
538 |
int oldVal = this.rows; |
|
539 |
if (rows < 0) { |
|
540 |
throw new IllegalArgumentException("rows less than zero."); |
|
541 |
} |
|
542 |
if (rows != oldVal) { |
|
543 |
this.rows = rows; |
|
544 |
invalidate(); |
|
545 |
} |
|
546 |
} |
|
547 |
||
548 |
/** |
|
549 |
* Defines the meaning of the height of a row. This defaults to |
|
550 |
* the height of the font. |
|
551 |
* |
|
20157
cafca01a8e28
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diff
changeset
|
552 |
* @return the height >= 1 |
2 | 553 |
*/ |
554 |
protected int getRowHeight() { |
|
555 |
if (rowHeight == 0) { |
|
556 |
FontMetrics metrics = getFontMetrics(getFont()); |
|
557 |
rowHeight = metrics.getHeight(); |
|
558 |
} |
|
559 |
return rowHeight; |
|
560 |
} |
|
561 |
||
562 |
/** |
|
563 |
* Returns the number of columns in the TextArea. |
|
564 |
* |
|
20157
cafca01a8e28
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5506
diff
changeset
|
565 |
* @return number of columns >= 0 |
2 | 566 |
*/ |
567 |
public int getColumns() { |
|
568 |
return columns; |
|
569 |
} |
|
570 |
||
571 |
/** |
|
572 |
* Sets the number of columns for this TextArea. Does an invalidate() |
|
573 |
* after setting the new value. |
|
574 |
* |
|
20157
cafca01a8e28
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yan
parents:
5506
diff
changeset
|
575 |
* @param columns the number of columns >= 0 |
2 | 576 |
* @exception IllegalArgumentException if columns is less than 0 |
577 |
* @see #getColumns |
|
578 |
* @beaninfo |
|
579 |
* description: the number of columns preferred for display |
|
580 |
*/ |
|
581 |
public void setColumns(int columns) { |
|
582 |
int oldVal = this.columns; |
|
583 |
if (columns < 0) { |
|
584 |
throw new IllegalArgumentException("columns less than zero."); |
|
585 |
} |
|
586 |
if (columns != oldVal) { |
|
587 |
this.columns = columns; |
|
588 |
invalidate(); |
|
589 |
} |
|
590 |
} |
|
591 |
||
592 |
/** |
|
593 |
* Gets column width. |
|
594 |
* The meaning of what a column is can be considered a fairly weak |
|
595 |
* notion for some fonts. This method is used to define the width |
|
596 |
* of a column. By default this is defined to be the width of the |
|
597 |
* character <em>m</em> for the font used. This method can be |
|
598 |
* redefined to be some alternative amount. |
|
599 |
* |
|
20157
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parents:
5506
diff
changeset
|
600 |
* @return the column width >= 1 |
2 | 601 |
*/ |
602 |
protected int getColumnWidth() { |
|
603 |
if (columnWidth == 0) { |
|
604 |
FontMetrics metrics = getFontMetrics(getFont()); |
|
605 |
columnWidth = metrics.charWidth('m'); |
|
606 |
} |
|
607 |
return columnWidth; |
|
608 |
} |
|
609 |
||
610 |
// --- Component methods ----------------------------------------- |
|
611 |
||
612 |
/** |
|
613 |
* Returns the preferred size of the TextArea. This is the |
|
614 |
* maximum of the size needed to display the text and the |
|
615 |
* size requested for the viewport. |
|
616 |
* |
|
617 |
* @return the size |
|
618 |
*/ |
|
619 |
public Dimension getPreferredSize() { |
|
620 |
Dimension d = super.getPreferredSize(); |
|
621 |
d = (d == null) ? new Dimension(400,400) : d; |
|
622 |
Insets insets = getInsets(); |
|
623 |
||
624 |
if (columns != 0) { |
|
625 |
d.width = Math.max(d.width, columns * getColumnWidth() + |
|
626 |
insets.left + insets.right); |
|
627 |
} |
|
628 |
if (rows != 0) { |
|
629 |
d.height = Math.max(d.height, rows * getRowHeight() + |
|
630 |
insets.top + insets.bottom); |
|
631 |
} |
|
632 |
return d; |
|
633 |
} |
|
634 |
||
635 |
/** |
|
636 |
* Sets the current font. This removes cached row height and column |
|
637 |
* width so the new font will be reflected, and calls revalidate(). |
|
638 |
* |
|
639 |
* @param f the font to use as the current font |
|
640 |
*/ |
|
641 |
public void setFont(Font f) { |
|
642 |
super.setFont(f); |
|
643 |
rowHeight = 0; |
|
644 |
columnWidth = 0; |
|
645 |
} |
|
646 |
||
647 |
||
648 |
/** |
|
649 |
* Returns a string representation of this JTextArea. This method |
|
650 |
* is intended to be used only for debugging purposes, and the |
|
651 |
* content and format of the returned string may vary between |
|
652 |
* implementations. The returned string may be empty but may not |
|
653 |
* be <code>null</code>. |
|
654 |
* |
|
655 |
* @return a string representation of this JTextArea. |
|
656 |
*/ |
|
657 |
protected String paramString() { |
|
658 |
String wrapString = (wrap ? |
|
659 |
"true" : "false"); |
|
660 |
String wordString = (word ? |
|
661 |
"true" : "false"); |
|
662 |
||
663 |
return super.paramString() + |
|
664 |
",colums=" + columns + |
|
665 |
",columWidth=" + columnWidth + |
|
666 |
",rows=" + rows + |
|
667 |
",rowHeight=" + rowHeight + |
|
668 |
",word=" + wordString + |
|
669 |
",wrap=" + wrapString; |
|
670 |
} |
|
671 |
||
672 |
// --- Scrollable methods ---------------------------------------- |
|
673 |
||
674 |
/** |
|
675 |
* Returns true if a viewport should always force the width of this |
|
676 |
* Scrollable to match the width of the viewport. This is implemented |
|
677 |
* to return true if the line wrapping policy is true, and false |
|
678 |
* if lines are not being wrapped. |
|
679 |
* |
|
680 |
* @return true if a viewport should force the Scrollables width |
|
681 |
* to match its own. |
|
682 |
*/ |
|
683 |
public boolean getScrollableTracksViewportWidth() { |
|
684 |
return (wrap) ? true : super.getScrollableTracksViewportWidth(); |
|
685 |
} |
|
686 |
||
687 |
/** |
|
688 |
* Returns the preferred size of the viewport if this component |
|
689 |
* is embedded in a JScrollPane. This uses the desired column |
|
690 |
* and row settings if they have been set, otherwise the superclass |
|
691 |
* behavior is used. |
|
692 |
* |
|
693 |
* @return The preferredSize of a JViewport whose view is this Scrollable. |
|
694 |
* @see JViewport#getPreferredSize |
|
695 |
*/ |
|
696 |
public Dimension getPreferredScrollableViewportSize() { |
|
697 |
Dimension size = super.getPreferredScrollableViewportSize(); |
|
698 |
size = (size == null) ? new Dimension(400,400) : size; |
|
699 |
Insets insets = getInsets(); |
|
700 |
||
701 |
size.width = (columns == 0) ? size.width : |
|
702 |
columns * getColumnWidth() + insets.left + insets.right; |
|
703 |
size.height = (rows == 0) ? size.height : |
|
704 |
rows * getRowHeight() + insets.top + insets.bottom; |
|
705 |
return size; |
|
706 |
} |
|
707 |
||
708 |
/** |
|
709 |
* Components that display logical rows or columns should compute |
|
710 |
* the scroll increment that will completely expose one new row |
|
711 |
* or column, depending on the value of orientation. This is implemented |
|
712 |
* to use the values returned by the <code>getRowHeight</code> and |
|
713 |
* <code>getColumnWidth</code> methods. |
|
714 |
* <p> |
|
715 |
* Scrolling containers, like JScrollPane, will use this method |
|
716 |
* each time the user requests a unit scroll. |
|
717 |
* |
|
718 |
* @param visibleRect the view area visible within the viewport |
|
719 |
* @param orientation Either SwingConstants.VERTICAL or |
|
720 |
* SwingConstants.HORIZONTAL. |
|
721 |
* @param direction Less than zero to scroll up/left, |
|
722 |
* greater than zero for down/right. |
|
723 |
* @return The "unit" increment for scrolling in the specified direction |
|
724 |
* @exception IllegalArgumentException for an invalid orientation |
|
725 |
* @see JScrollBar#setUnitIncrement |
|
726 |
* @see #getRowHeight |
|
727 |
* @see #getColumnWidth |
|
728 |
*/ |
|
729 |
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) { |
|
730 |
switch (orientation) { |
|
731 |
case SwingConstants.VERTICAL: |
|
732 |
return getRowHeight(); |
|
733 |
case SwingConstants.HORIZONTAL: |
|
734 |
return getColumnWidth(); |
|
735 |
default: |
|
736 |
throw new IllegalArgumentException("Invalid orientation: " + orientation); |
|
737 |
} |
|
738 |
} |
|
739 |
||
740 |
/** |
|
741 |
* See readObject() and writeObject() in JComponent for more |
|
742 |
* information about serialization in Swing. |
|
743 |
*/ |
|
744 |
private void writeObject(ObjectOutputStream s) throws IOException { |
|
745 |
s.defaultWriteObject(); |
|
746 |
if (getUIClassID().equals(uiClassID)) { |
|
747 |
byte count = JComponent.getWriteObjCounter(this); |
|
748 |
JComponent.setWriteObjCounter(this, --count); |
|
749 |
if (count == 0 && ui != null) { |
|
750 |
ui.installUI(this); |
|
751 |
} |
|
752 |
} |
|
753 |
} |
|
754 |
||
755 |
///////////////// |
|
756 |
// Accessibility support |
|
757 |
//////////////// |
|
758 |
||
759 |
||
760 |
/** |
|
761 |
* Gets the AccessibleContext associated with this JTextArea. |
|
762 |
* For JTextAreas, the AccessibleContext takes the form of an |
|
763 |
* AccessibleJTextArea. |
|
764 |
* A new AccessibleJTextArea instance is created if necessary. |
|
765 |
* |
|
766 |
* @return an AccessibleJTextArea that serves as the |
|
767 |
* AccessibleContext of this JTextArea |
|
768 |
*/ |
|
769 |
public AccessibleContext getAccessibleContext() { |
|
770 |
if (accessibleContext == null) { |
|
771 |
accessibleContext = new AccessibleJTextArea(); |
|
772 |
} |
|
773 |
return accessibleContext; |
|
774 |
} |
|
775 |
||
776 |
/** |
|
777 |
* This class implements accessibility support for the |
|
778 |
* <code>JTextArea</code> class. It provides an implementation of the |
|
779 |
* Java Accessibility API appropriate to text area user-interface |
|
780 |
* elements. |
|
781 |
* <p> |
|
782 |
* <strong>Warning:</strong> |
|
783 |
* Serialized objects of this class will not be compatible with |
|
784 |
* future Swing releases. The current serialization support is |
|
785 |
* appropriate for short term storage or RMI between applications running |
|
786 |
* the same version of Swing. As of 1.4, support for long term storage |
|
20458 | 787 |
* of all JavaBeans™ |
2 | 788 |
* has been added to the <code>java.beans</code> package. |
789 |
* Please see {@link java.beans.XMLEncoder}. |
|
790 |
*/ |
|
22574
7f8ce0c8c20a
8032627: Add @SuppressWarnings("serial") to appropriate javax.swing classes
darcy
parents:
22260
diff
changeset
|
791 |
@SuppressWarnings("serial") // Same-version serialization only |
2 | 792 |
protected class AccessibleJTextArea extends AccessibleJTextComponent { |
793 |
||
794 |
/** |
|
795 |
* Gets the state set of this object. |
|
796 |
* |
|
797 |
* @return an instance of AccessibleStateSet describing the states |
|
798 |
* of the object |
|
799 |
* @see AccessibleStateSet |
|
800 |
*/ |
|
801 |
public AccessibleStateSet getAccessibleStateSet() { |
|
802 |
AccessibleStateSet states = super.getAccessibleStateSet(); |
|
803 |
states.add(AccessibleState.MULTI_LINE); |
|
804 |
return states; |
|
805 |
} |
|
806 |
} |
|
807 |
||
808 |
// --- variables ------------------------------------------------- |
|
809 |
||
810 |
private int rows; |
|
811 |
private int columns; |
|
812 |
private int columnWidth; |
|
813 |
private int rowHeight; |
|
814 |
private boolean wrap; |
|
815 |
private boolean word; |
|
816 |
||
817 |
} |