1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26
27 package sun.lwawt;
28
29 import java.awt.Component;
30 import java.awt.Dimension;
31 import java.awt.Point;
32 import java.awt.TextArea;
33 import java.awt.event.TextEvent;
34 import java.awt.peer.TextAreaPeer;
35
36 import javax.swing.JScrollBar;
37 import javax.swing.JScrollPane;
38 import javax.swing.JTextArea;
39 import javax.swing.ScrollPaneConstants;
40 import javax.swing.text.Document;
41 import javax.swing.text.JTextComponent;
42
43 final class LWTextAreaPeer
44 extends LWTextComponentPeer<TextArea, LWTextAreaPeer.ScrollableJTextArea>
45 implements TextAreaPeer {
46
47 private static final int DEFAULT_COLUMNS = 60;
48 private static final int DEFAULT_ROWS = 10;
49
50 LWTextAreaPeer(final TextArea target,
51 final PlatformComponent platformComponent) {
52 super(target, platformComponent);
53 }
54
55 @Override
56 protected ScrollableJTextArea createDelegate() {
57 return new ScrollableJTextArea();
58 }
59
60 @Override
61 public void initialize() {
62 super.initialize();
63 final int visibility = getTarget().getScrollbarVisibility();
64 synchronized (getDelegateLock()) {
65 setScrollBarVisibility(visibility);
66 }
67 }
68
69 @Override
70 JTextComponent getTextComponent() {
71 return getDelegate().getView();
72 }
73
74 @Override
75 protected Component getDelegateFocusOwner() {
76 return getTextComponent();
77 }
78
79 @Override
80 public Dimension getMinimumSize() {
81 return getMinimumSize(DEFAULT_ROWS, DEFAULT_COLUMNS);
82 }
83
84 @Override
85 public Dimension getMinimumSize(final int rows, final int columns) {
86 return getPreferredSize(rows, columns);
87 }
88
89 @Override
90 public Dimension getPreferredSize(final int rows, final int columns) {
91 final Dimension size = super.getPreferredSize(rows, columns);
92 synchronized (getDelegateLock()) {
93 final JScrollBar vbar = getDelegate().getVerticalScrollBar();
94 final JScrollBar hbar = getDelegate().getHorizontalScrollBar();
95 final int scrollbarW = vbar != null ? vbar.getWidth() : 0;
96 final int scrollbarH = hbar != null ? hbar.getHeight() : 0;
97 return new Dimension(size.width + scrollbarW,
98 size.height + scrollbarH);
99 }
100 }
101
102 @Override
103 public void insert(final String text, final int pos) {
104 final ScrollableJTextArea pane = getDelegate();
105 synchronized (getDelegateLock()) {
106 final JTextArea area = pane.getView();
107 final boolean doScroll = pos >= area.getDocument().getLength()
108 && area.getDocument().getLength() != 0;
109 area.insert(text, pos);
110 revalidate();
111 if (doScroll) {
112 final JScrollBar vbar = pane.getVerticalScrollBar();
113 if (vbar != null) {
114 vbar.setValue(vbar.getMaximum() - vbar.getVisibleAmount());
115 }
116 }
117 }
118 repaintPeer();
119 }
120
121 @Override
122 public void setText(final String l) {
123 // Please note that we do not want to post an event
124 // if TextArea.setText() replaces an empty text by an empty text,
125 // that is, if component's text remains unchanged.
126 if (!l.isEmpty() || getTextComponent().getDocument().getLength() != 0) {
127 super.setText(l);
128 }
129 }
130
131 @Override
132 public void replaceRange(final String text, final int start,
133 final int end) {
134 synchronized (getDelegateLock()) {
135 // JTextArea.replaceRange() posts two different events.
136 // Since we make no differences between text events,
137 // the document listener has to be disabled while
138 // JTextArea.replaceRange() is called.
139 final Document document = getTextComponent().getDocument();
140 document.removeDocumentListener(this);
141 getDelegate().getView().replaceRange(text, start, end);
142 revalidate();
143 postEvent(new TextEvent(getTarget(), TextEvent.TEXT_VALUE_CHANGED));
144 document.addDocumentListener(this);
145 }
146 repaintPeer();
147 }
148
149 private void setScrollBarVisibility(final int visibility) {
150 final ScrollableJTextArea pane = getDelegate();
151 final JTextArea view = pane.getView();
152 view.setLineWrap(false);
153
154 switch (visibility) {
155 case TextArea.SCROLLBARS_NONE:
156 pane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
157 pane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
158 view.setLineWrap(true);
159 break;
160 case TextArea.SCROLLBARS_VERTICAL_ONLY:
161 pane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
162 pane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
163 view.setLineWrap(true);
164 break;
165 case TextArea.SCROLLBARS_HORIZONTAL_ONLY:
166 pane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
167 pane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
168 break;
169 default:
170 pane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
171 pane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
172 break;
173 }
174 }
175
176 @SuppressWarnings("serial")
177 final class ScrollableJTextArea extends JScrollPane {
178
179 ScrollableJTextArea() {
180 super();
181 getViewport().setView(new JTextAreaDelegate());
182 }
183
184 public JTextArea getView() {
185 return (JTextArea) getViewport().getView();
186 }
187
188 @Override
189 public void setEnabled(final boolean enabled) {
190 getViewport().getView().setEnabled(enabled);
191 super.setEnabled(enabled);
192 }
193
194 @SuppressWarnings("serial")
195 private final class JTextAreaDelegate extends JTextArea {
196
197 // Empty non private constructor was added because access to this
198 // class shouldn't be emulated by a synthetic accessor method.
199 JTextAreaDelegate() {
200 super();
201 }
202
203 @Override
204 public boolean hasFocus() {
205 return getTarget().hasFocus();
206 }
207
208 @Override
209 public Point getLocationOnScreen() {
210 return LWTextAreaPeer.this.getLocationOnScreen();
211 }
212 }
213 }
214 }