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jeremybenn |
/* TextArea.java -- A multi-line text entry component
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Copyright (C) 1999, 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 java.awt;
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import java.awt.event.KeyEvent;
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import java.awt.peer.ComponentPeer;
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import java.awt.peer.TextAreaPeer;
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import java.util.HashSet;
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import java.util.Set;
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import javax.accessibility.AccessibleContext;
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import javax.accessibility.AccessibleStateSet;
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/**
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* A TextArea is a text component capable of displaying multiple lines
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* of user-editable text. A TextArea handles its own scrolling and
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* can display vertical and horizontal scrollbars as navigation aids.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class TextArea extends TextComponent implements java.io.Serializable
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{
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/**
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* Display both horiztonal and vertical scroll bars.
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*/
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public static final int SCROLLBARS_BOTH = 0;
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/**
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* Display vertical scroll bar only.
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*/
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public static final int SCROLLBARS_VERTICAL_ONLY = 1;
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/**
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* Display horizatonal scroll bar only.
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*/
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public static final int SCROLLBARS_HORIZONTAL_ONLY = 2;
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/**
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* Do not display scrollbars.
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*/
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public static final int SCROLLBARS_NONE = 3;
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/**
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* Serialization constant.
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*/
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private static final long serialVersionUID = 3692302836626095722L;
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/**
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* @serial The number of columns used in this text area's preferred
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* and minimum size calculations.
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*/
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private int columns;
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/**
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* @serial The number of rows used in this text area's preferred and
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* minimum size calculations.
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*/
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private int rows;
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/**
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* @serial The scrollbar display policy. One of SCROLLBARS_BOTH,
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* SCROLLBARS_VERTICAL_ONLY, SCROLLBARS_HORIZONTAL_ONLY,
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* SCROLLBARS_NONE.
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*/
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private int scrollbarVisibility;
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/*
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* The number used to generate the name returned by getName.
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*/
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private static transient long next_text_number;
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/**
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* Initialize a new instance of <code>TextArea</code> that is empty.
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* Conceptually the <code>TextArea</code> has 0 rows and 0 columns
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* but its initial bounds are defined by its peer or by the
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* container in which it is packed. Both horizontal and vertical
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* scrollbars will be displayed.
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*
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* @exception HeadlessException if GraphicsEnvironment.isHeadless () is true
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*/
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public TextArea ()
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{
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this ("", 0, 0, SCROLLBARS_BOTH);
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}
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/**
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* Initialize a new instance of <code>TextArea</code> that contains
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* the specified text. Conceptually the <code>TextArea</code> has 0
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* rows and 0 columns but its initial bounds are defined by its peer
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* or by the container in which it is packed. Both horizontal and
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* veritcal scrollbars will be displayed. The TextArea initially contains
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* the specified text. If text specified as <code>null<code>, it will
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* be set to "".
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*
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* @param text The text to display in this text area (<code>null</code> permitted).
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*
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* @exception HeadlessException if GraphicsEnvironment.isHeadless () is true
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*/
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public TextArea (String text)
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{
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this (text, 0, 0, SCROLLBARS_BOTH);
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}
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/**
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* Initialize a new instance of <code>TextArea</code> that is empty
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* and can display the specified number of rows and columns of text,
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* without the need to scroll. Both horizontal and vertical
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* scrollbars will be displayed.
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*
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* @param rows The number of rows in this text area.
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* @param columns The number of columns in this text area.
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*
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* @exception HeadlessException if GraphicsEnvironment.isHeadless () is true
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*/
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public TextArea (int rows, int columns)
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{
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this ("", rows, columns, SCROLLBARS_BOTH);
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}
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/**
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* Initialize a new instance of <code>TextArea</code> that can
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* display the specified number of rows and columns of text, without
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* the need to scroll. The TextArea initially contains the
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* specified text. If text specified as <code>null<code>, it will
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* be set to "".
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*
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* @param text The text to display in this text area (<code>null</code> permitted).
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* @param rows The number of rows in this text area.
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* @param columns The number of columns in this text area.
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*
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* @exception HeadlessException if GraphicsEnvironment.isHeadless () is true
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*/
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public TextArea (String text, int rows, int columns)
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{
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this (text, rows, columns, SCROLLBARS_BOTH);
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}
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/**
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* Initialize a new instance of <code>TextArea</code> that initially
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* contains the specified text. The TextArea can display the
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* specified number of rows and columns of text, without the need to
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* scroll. This constructor allows specification of the scroll bar
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* display policy. The TextArea initially contains the specified text.
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* If text specified as <code>null<code>, it will be set to "".
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*
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* @param text The text to display in this text area (<code>null</code> permitted).
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* @param rows The number of rows in this text area.
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* @param columns The number of columns in this text area.
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* @param scrollbarVisibility The scroll bar display policy. One of
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* SCROLLBARS_BOTH, SCROLLBARS_VERTICAL_ONLY,
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* SCROLLBARS_HORIZONTAL_ONLY, SCROLLBARS_NONE.
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*
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* @exception HeadlessException if GraphicsEnvironment.isHeadless () is true
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*/
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public TextArea (String text, int rows, int columns, int scrollbarVisibility)
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{
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super (text);
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if (GraphicsEnvironment.isHeadless ())
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throw new HeadlessException ();
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if (rows < 0)
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this.rows = 0;
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else
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this.rows = rows;
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if (columns < 0)
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this.columns = 0;
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else
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this.columns = columns;
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if (scrollbarVisibility < 0 || scrollbarVisibility > 4)
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this.scrollbarVisibility = SCROLLBARS_BOTH;
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else
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this.scrollbarVisibility = scrollbarVisibility;
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// TextAreas need to receive tab key events so we override the
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// default forward and backward traversal key sets.
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Set s = new HashSet ();
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s.add (AWTKeyStroke.getAWTKeyStroke (KeyEvent.VK_TAB,
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KeyEvent.CTRL_DOWN_MASK));
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setFocusTraversalKeys (KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, s);
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s = new HashSet ();
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s.add (AWTKeyStroke.getAWTKeyStroke (KeyEvent.VK_TAB,
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KeyEvent.SHIFT_DOWN_MASK
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| KeyEvent.CTRL_DOWN_MASK));
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setFocusTraversalKeys (KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, s);
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}
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/**
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* Retrieve the number of columns that this text area would prefer
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* to display. This value may or may not correspond to the number
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* of columns that are actually displayed.
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*
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* @return The preferred number of columns.
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*/
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public int getColumns ()
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{
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return columns;
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}
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/**
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* Set the preferred number of columns for this text area. This
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* method does not cause the number of columns displayed by the text
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* area to be updated, if the text area is currently visible.
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*
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* @param columns The preferred number of columns.
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*
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* @exception IllegalArgumentException If columns is less than zero.
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*/
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public synchronized void setColumns (int columns)
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{
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if (columns < 0)
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throw new IllegalArgumentException ("Value is less than zero: "
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+ columns);
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this.columns = columns;
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}
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/**
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* Retrieve the number of rows that this text area would prefer to
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* display. This value may or may not correspond to the number of
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* rows that are actually displayed.
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*
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* @return The preferred number of rows.
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*/
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public int getRows ()
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{
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return rows;
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}
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/**
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* Set the preferred number of rows for this text area. This method
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* does not cause the number of columns displayed by the text area
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* to be updated, if the text area is currently visible.
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*
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* @param rows The preferred number of rows.
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*
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* @exception IllegalArgumentException If rows is less than zero.
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*/
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public synchronized void setRows (int rows)
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{
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if (rows < 1)
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throw new IllegalArgumentException ("Value is less than one: " + rows);
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this.rows = rows;
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}
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/**
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* Retrieve the minimum size for this text area.
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*
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* @return The minimum size for this text field.
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*/
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public Dimension getMinimumSize ()
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{
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return getMinimumSize (getRows (), getColumns ());
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}
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/**
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* Retrieve the minimum size for this text area. If the minimum
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* size has been set, then rows and columns are used in the calculation.
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*
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* @param rows The number of rows to use in the minimum size
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* calculation.
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* @param columns The number of columns to use in the minimum size
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* calculation.
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*
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* @return The minimum size for this text area.
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*/
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public Dimension getMinimumSize (int rows, int columns)
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{
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return minimumSize (rows, columns);
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}
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/**
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* Retrieve the minimum size for this text area.
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*
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* @return The minimum size for this text area.
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*
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* @deprecated This method is deprecated in favor of
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* <code>getMinimumSize ()</code>.
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*/
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public Dimension minimumSize ()
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{
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return minimumSize (getRows (), getColumns ());
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}
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/**
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* Retrieve the minimum size for this text area. If the minimum
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* size has been set, then rows and columns are used in the calculation.
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*
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* @param rows The number of rows to use in the minimum size
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* calculation.
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* @param columns The number of columns to use in the minimum size
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* calculation.
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*
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* @return The minimum size for this text area.
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*
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* @deprecated This method is deprecated in favor of
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* <code>getMinimumSize (int, int)</code>.
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*/
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public Dimension minimumSize (int rows, int columns)
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{
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if (isMinimumSizeSet())
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return new Dimension(minSize);
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TextAreaPeer peer = (TextAreaPeer) getPeer ();
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if (peer == null)
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return new Dimension (getWidth(), getHeight());
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return peer.getMinimumSize (rows, columns);
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}
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/**
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* Retrieve the preferred size for this text area.
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*
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* @return The preferred size for this text field.
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*/
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public Dimension getPreferredSize ()
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{
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return getPreferredSize (getRows (), getColumns ());
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}
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/**
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* Retrieve the preferred size for this text area. If the preferred
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* size has been set, then rows and columns are used in the calculation.
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*
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* @param rows The number of rows to use in the preferred size
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* calculation.
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* @param columns The number of columns to use in the preferred size
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* calculation.
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*
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* @return The preferred size for this text area.
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*/
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public Dimension getPreferredSize (int rows, int columns)
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373 |
|
|
{
|
374 |
|
|
return preferredSize (rows, columns);
|
375 |
|
|
}
|
376 |
|
|
|
377 |
|
|
/**
|
378 |
|
|
* Retrieve the preferred size for this text area.
|
379 |
|
|
*
|
380 |
|
|
* @return The preferred size for this text field.
|
381 |
|
|
*
|
382 |
|
|
* @deprecated This method is deprecated in favor of
|
383 |
|
|
* <code>getPreferredSize ()</code>.
|
384 |
|
|
*/
|
385 |
|
|
public Dimension preferredSize ()
|
386 |
|
|
{
|
387 |
|
|
return preferredSize (getRows (), getColumns ());
|
388 |
|
|
}
|
389 |
|
|
|
390 |
|
|
/**
|
391 |
|
|
* Retrieve the preferred size for this text area. If the preferred
|
392 |
|
|
* size has been set, then rows and columns are used in the calculation.
|
393 |
|
|
*
|
394 |
|
|
* @param rows The number of rows to use in the preferred size
|
395 |
|
|
* calculation.
|
396 |
|
|
* @param columns The number of columns to use in the preferred size
|
397 |
|
|
* calculation.
|
398 |
|
|
*
|
399 |
|
|
* @return The preferred size for this text area.
|
400 |
|
|
*
|
401 |
|
|
* @deprecated This method is deprecated in favor of
|
402 |
|
|
* <code>getPreferredSize (int, int)</code>.
|
403 |
|
|
*/
|
404 |
|
|
public Dimension preferredSize (int rows, int columns)
|
405 |
|
|
{
|
406 |
|
|
if (isPreferredSizeSet())
|
407 |
|
|
return new Dimension(prefSize);
|
408 |
|
|
|
409 |
|
|
TextAreaPeer peer = (TextAreaPeer) getPeer ();
|
410 |
|
|
if (peer == null)
|
411 |
|
|
return new Dimension (getWidth(), getHeight());
|
412 |
|
|
|
413 |
|
|
return peer.getPreferredSize (rows, columns);
|
414 |
|
|
}
|
415 |
|
|
|
416 |
|
|
/**
|
417 |
|
|
* Retrieve the scroll bar display policy -- one of SCROLLBARS_BOTH,
|
418 |
|
|
* SCROLLBARS_VERTICAL_ONLY, SCROLLBARS_HORIZONTAL_ONLY,
|
419 |
|
|
* SCROLLBARS_NONE.
|
420 |
|
|
*
|
421 |
|
|
* @return The current scroll bar display policy.
|
422 |
|
|
*/
|
423 |
|
|
public int getScrollbarVisibility ()
|
424 |
|
|
{
|
425 |
|
|
return scrollbarVisibility;
|
426 |
|
|
}
|
427 |
|
|
|
428 |
|
|
/**
|
429 |
|
|
* Notify this object that it should create its native peer.
|
430 |
|
|
*/
|
431 |
|
|
public void addNotify ()
|
432 |
|
|
{
|
433 |
|
|
if (getPeer () == null)
|
434 |
|
|
setPeer ((ComponentPeer) getToolkit().createTextArea (this));
|
435 |
|
|
}
|
436 |
|
|
|
437 |
|
|
/**
|
438 |
|
|
* Append the specified text to the end of the current text.
|
439 |
|
|
*
|
440 |
|
|
* @param str The text to append.
|
441 |
|
|
*/
|
442 |
|
|
public void append (String str)
|
443 |
|
|
{
|
444 |
|
|
appendText (str);
|
445 |
|
|
}
|
446 |
|
|
|
447 |
|
|
/**
|
448 |
|
|
* Append the specified text to the end of the current text.
|
449 |
|
|
*
|
450 |
|
|
* @param str The text to append.
|
451 |
|
|
*
|
452 |
|
|
* @deprecated This method is deprecated in favor of
|
453 |
|
|
* <code>append ()</code>.
|
454 |
|
|
*/
|
455 |
|
|
public void appendText (String str)
|
456 |
|
|
{
|
457 |
|
|
TextAreaPeer peer = (TextAreaPeer) getPeer ();
|
458 |
|
|
|
459 |
|
|
if (peer != null)
|
460 |
|
|
peer.insert (str, peer.getText().length ());
|
461 |
|
|
else
|
462 |
|
|
setText(getText() + str);
|
463 |
|
|
}
|
464 |
|
|
|
465 |
|
|
/**
|
466 |
|
|
* Insert the specified text at the specified position. The first
|
467 |
|
|
* character in the text area is at position zero.
|
468 |
|
|
*
|
469 |
|
|
* @param str The text to insert.
|
470 |
|
|
* @param pos The position at which to insert text.
|
471 |
|
|
*/
|
472 |
|
|
public void insert (String str, int pos)
|
473 |
|
|
{
|
474 |
|
|
insertText (str, pos);
|
475 |
|
|
}
|
476 |
|
|
|
477 |
|
|
/**
|
478 |
|
|
* Insert the specified text at the specified position. The first
|
479 |
|
|
* character in the text area is at position zero.
|
480 |
|
|
*
|
481 |
|
|
* @param str The text to insert.
|
482 |
|
|
* @param pos The position at which to insert text.
|
483 |
|
|
*
|
484 |
|
|
* @deprecated This method is deprecated in favor of
|
485 |
|
|
* <code>insert ()</code>.
|
486 |
|
|
*/
|
487 |
|
|
public void insertText (String str, int pos)
|
488 |
|
|
{
|
489 |
|
|
String tmp1 = null;
|
490 |
|
|
String tmp2 = null;
|
491 |
|
|
|
492 |
|
|
TextAreaPeer peer = (TextAreaPeer) getPeer ();
|
493 |
|
|
|
494 |
|
|
if (peer != null)
|
495 |
|
|
peer.insert (str, pos);
|
496 |
|
|
else
|
497 |
|
|
{
|
498 |
|
|
tmp1 = getText().substring(0, pos);
|
499 |
|
|
tmp2 = getText().substring(pos, getText().length());
|
500 |
|
|
setText(tmp1 + str + tmp2);
|
501 |
|
|
}
|
502 |
|
|
}
|
503 |
|
|
|
504 |
|
|
/**
|
505 |
|
|
* Replace a range of characters with the specified text. The
|
506 |
|
|
* character at the start position will be replaced, unless start ==
|
507 |
|
|
* end. The character at the end posistion will not be replaced.
|
508 |
|
|
* The first character in the text area is at position zero. The
|
509 |
|
|
* length of the replacement text may differ from the length of the
|
510 |
|
|
* text that is replaced.
|
511 |
|
|
*
|
512 |
|
|
* @param str The new text for the range.
|
513 |
|
|
* @param start The start position of the replacement range.
|
514 |
|
|
* @param end The end position of the replacement range.
|
515 |
|
|
*/
|
516 |
|
|
public void replaceRange (String str, int start, int end)
|
517 |
|
|
{
|
518 |
|
|
replaceText (str, start, end);
|
519 |
|
|
}
|
520 |
|
|
|
521 |
|
|
/**
|
522 |
|
|
* Replace a range of characters with the specified text. The
|
523 |
|
|
* character at the start position will be replaced, unless start ==
|
524 |
|
|
* end. The character at the end posistion will not be replaced.
|
525 |
|
|
* The first character in the text area is at position zero. The
|
526 |
|
|
* length of the replacement text may differ from the length of the
|
527 |
|
|
* text that is replaced.
|
528 |
|
|
*
|
529 |
|
|
* @param str The new text for the range.
|
530 |
|
|
* @param start The start position of the replacement range.
|
531 |
|
|
* @param end The end position of the replacement range.
|
532 |
|
|
*
|
533 |
|
|
* @deprecated This method is deprecated in favor of
|
534 |
|
|
* <code>replaceRange ()</code>.
|
535 |
|
|
*/
|
536 |
|
|
public void replaceText (String str, int start, int end)
|
537 |
|
|
{
|
538 |
|
|
String tmp1 = null;
|
539 |
|
|
String tmp2 = null;
|
540 |
|
|
|
541 |
|
|
TextAreaPeer peer = (TextAreaPeer) getPeer();
|
542 |
|
|
|
543 |
|
|
if (peer != null)
|
544 |
|
|
peer.replaceRange(str, start, end);
|
545 |
|
|
else
|
546 |
|
|
{
|
547 |
|
|
tmp1 = getText().substring(0, start);
|
548 |
|
|
tmp2 = getText().substring(end, getText().length());
|
549 |
|
|
setText(tmp1 + str + tmp2);
|
550 |
|
|
}
|
551 |
|
|
}
|
552 |
|
|
|
553 |
|
|
/**
|
554 |
|
|
* Retrieve a debugging string for this text area.
|
555 |
|
|
*
|
556 |
|
|
* @return A debugging string for this text area.
|
557 |
|
|
*/
|
558 |
|
|
protected String paramString ()
|
559 |
|
|
{
|
560 |
|
|
String sbVisibility = "";
|
561 |
|
|
|
562 |
|
|
switch (scrollbarVisibility)
|
563 |
|
|
{
|
564 |
|
|
case SCROLLBARS_BOTH:
|
565 |
|
|
sbVisibility = "both";
|
566 |
|
|
break;
|
567 |
|
|
case SCROLLBARS_VERTICAL_ONLY:
|
568 |
|
|
sbVisibility = "vertical-only";
|
569 |
|
|
break;
|
570 |
|
|
case SCROLLBARS_HORIZONTAL_ONLY:
|
571 |
|
|
sbVisibility = "horizontal-only";
|
572 |
|
|
break;
|
573 |
|
|
case SCROLLBARS_NONE:
|
574 |
|
|
sbVisibility = "none";
|
575 |
|
|
break;
|
576 |
|
|
}
|
577 |
|
|
|
578 |
|
|
String editable = "";
|
579 |
|
|
if (isEditable ())
|
580 |
|
|
editable = "editable,";
|
581 |
|
|
|
582 |
|
|
return getName () + "," + getX () + "," + getY () + "," + getWidth ()
|
583 |
|
|
+ "x" + getHeight () + "," + "text=" + getText () + "," + editable
|
584 |
|
|
+ "selection=" + getSelectionStart () + "-" + getSelectionEnd ()
|
585 |
|
|
+ ",rows=" + rows + ",columns=" + columns + ",scrollbarVisibility="
|
586 |
|
|
+ sbVisibility;
|
587 |
|
|
}
|
588 |
|
|
|
589 |
|
|
/**
|
590 |
|
|
* Generate a unique name for this text area.
|
591 |
|
|
*
|
592 |
|
|
* @return A unique name for this text area.
|
593 |
|
|
*/
|
594 |
|
|
String generateName ()
|
595 |
|
|
{
|
596 |
|
|
return "text" + getUniqueLong ();
|
597 |
|
|
}
|
598 |
|
|
|
599 |
|
|
private static synchronized long getUniqueLong ()
|
600 |
|
|
{
|
601 |
|
|
return next_text_number++;
|
602 |
|
|
}
|
603 |
|
|
|
604 |
|
|
protected class AccessibleAWTTextArea extends AccessibleAWTTextComponent
|
605 |
|
|
{
|
606 |
|
|
private static final long serialVersionUID = 3472827823632144419L;
|
607 |
|
|
|
608 |
|
|
protected AccessibleAWTTextArea()
|
609 |
|
|
{
|
610 |
|
|
}
|
611 |
|
|
|
612 |
|
|
public AccessibleStateSet getAccessibleStateSet()
|
613 |
|
|
{
|
614 |
|
|
return super.getAccessibleStateSet();
|
615 |
|
|
}
|
616 |
|
|
}
|
617 |
|
|
|
618 |
|
|
/**
|
619 |
|
|
* Gets the AccessibleContext associated with this <code>TextArea</code>.
|
620 |
|
|
* The context is created, if necessary.
|
621 |
|
|
*
|
622 |
|
|
* @return the associated context
|
623 |
|
|
*/
|
624 |
|
|
public AccessibleContext getAccessibleContext()
|
625 |
|
|
{
|
626 |
|
|
/* Create the context if this is the first request */
|
627 |
|
|
if (accessibleContext == null)
|
628 |
|
|
accessibleContext = new AccessibleAWTTextArea();
|
629 |
|
|
return accessibleContext;
|
630 |
|
|
}
|
631 |
|
|
}
|