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.Dimension;
30 import java.awt.FontMetrics;
31 import java.awt.Insets;
32 import java.awt.SystemColor;
33 import java.awt.TextComponent;
34 import java.awt.event.FocusEvent;
35 import java.awt.event.TextEvent;
36 import java.awt.event.InputMethodListener;
37 import java.awt.event.InputMethodEvent;
38 import java.awt.im.InputMethodRequests;
39 import java.awt.peer.TextComponentPeer;
40 import sun.awt.AWTAccessor;
41
42 import javax.swing.JComponent;
43 import javax.swing.event.DocumentEvent;
44 import javax.swing.event.DocumentListener;
45 import javax.swing.text.Document;
46 import javax.swing.text.JTextComponent;
47
48 abstract class LWTextComponentPeer<T extends TextComponent, D extends JComponent>
49 extends LWComponentPeer<T, D>
50 implements DocumentListener, TextComponentPeer, InputMethodListener {
51
52 /**
53 * Character with reasonable value between the minimum width and maximum.
54 */
55 protected static final char WIDE_CHAR = 'w';
56 private volatile boolean firstChangeSkipped;
57
58 LWTextComponentPeer(final T target,
59 final PlatformComponent platformComponent) {
60 super(target, platformComponent);
61 if (!getTarget().isBackgroundSet()) {
62 getTarget().setBackground(SystemColor.text);
63 }
64 }
65
66 @Override
67 public void initialize() {
68 super.initialize();
69 synchronized (getDelegateLock()) {
70 // This listener should be added before setText().
71 getTextComponent().getDocument().addDocumentListener(this);
72 }
73 setEditable(getTarget().isEditable());
74 setText(getTarget().getText());
75 getTarget().addInputMethodListener(this);
76 final int start = getTarget().getSelectionStart();
77 final int end = getTarget().getSelectionEnd();
78 if (end > start) {
79 select(start, end);
80 }
81 setCaretPosition(getTarget().getCaretPosition());
82 firstChangeSkipped = true;
83 }
84
85 abstract JTextComponent getTextComponent();
86
87 public Dimension getPreferredSize(final int rows, final int columns) {
88 final Insets insets;
89 synchronized (getDelegateLock()) {
90 insets = getDelegate().getInsets();
91 }
92 final int borderHeight = insets.top + insets.bottom;
93 final int borderWidth = insets.left + insets.right;
94 final FontMetrics fm = getFontMetrics(getFont());
95 final int charWidth = (fm != null) ? fm.charWidth(WIDE_CHAR) : 10;
96 final int itemHeight = (fm != null) ? fm.getHeight() : 10;
97 return new Dimension(columns * charWidth + borderWidth,
98 rows * itemHeight + borderHeight);
99 }
100
101 @Override
102 public final void setEditable(final boolean editable) {
103 synchronized (getDelegateLock()) {
104 getTextComponent().setEditable(editable);
105 }
106 }
107
108 @Override
109 public final String getText() {
110 synchronized (getDelegateLock()) {
111 return getTextComponent().getText();
112 }
113 }
114
115 @Override
116 public void setText(final String l) {
117 synchronized (getDelegateLock()) {
118 // JTextArea.setText() posts two different events (remove & insert).
119 // Since we make no differences between text events,
120 // the document listener has to be disabled while
121 // JTextArea.setText() is called.
122 final Document document = getTextComponent().getDocument();
123 document.removeDocumentListener(this);
124 getTextComponent().setText(l);
125 revalidate();
126 if (firstChangeSkipped) {
127 postEvent(new TextEvent(getTarget(),
128 TextEvent.TEXT_VALUE_CHANGED));
129 }
130 document.addDocumentListener(this);
131 }
132 repaintPeer();
133 }
134
135 @Override
136 public final int getSelectionStart() {
137 synchronized (getDelegateLock()) {
138 return getTextComponent().getSelectionStart();
139 }
140 }
141
142 @Override
143 public final int getSelectionEnd() {
144 synchronized (getDelegateLock()) {
145 return getTextComponent().getSelectionEnd();
146 }
147 }
148
149 @Override
150 public final void select(final int selStart, final int selEnd) {
151 synchronized (getDelegateLock()) {
152 getTextComponent().select(selStart, selEnd);
153 }
154 repaintPeer();
155 }
156
157 @Override
158 public final void setCaretPosition(final int pos) {
159 synchronized (getDelegateLock()) {
160 getTextComponent().setCaretPosition(pos);
161 }
162 repaintPeer();
163 }
164
165 @Override
166 public final int getCaretPosition() {
167 synchronized (getDelegateLock()) {
168 return getTextComponent().getCaretPosition();
169 }
170 }
171
172 @Override
173 public final InputMethodRequests getInputMethodRequests() {
174 synchronized (getDelegateLock()) {
175 return getTextComponent().getInputMethodRequests();
176 }
177 }
178
179 @Override
180 public final boolean isFocusable() {
181 return getTarget().isFocusable();
182 }
183
184 protected final void revalidate() {
185 synchronized (getDelegateLock()) {
186 getTextComponent().invalidate();
187 getDelegate().validate();
188 }
189 }
190
191 private void sendTextEvent(final DocumentEvent e) {
192 postEvent(new TextEvent(getTarget(), TextEvent.TEXT_VALUE_CHANGED));
193 synchronized (getDelegateLock()) {
194 revalidate();
195 }
196 }
197
198 @Override
199 public final void changedUpdate(final DocumentEvent e) {
200 sendTextEvent(e);
201 }
202
203 @Override
204 public final void insertUpdate(final DocumentEvent e) {
205 sendTextEvent(e);
206 }
207
208 @Override
209 public final void removeUpdate(final DocumentEvent e) {
210 sendTextEvent(e);
211 }
212
213 @Override
214 public final void inputMethodTextChanged(final InputMethodEvent event) {
215 synchronized (getDelegateLock()) {
216 AWTAccessor.getComponentAccessor().processEvent(getTextComponent(), event);
217 }
218 }
219
220 @Override
221 public final void caretPositionChanged(final InputMethodEvent event) {
222 synchronized (getDelegateLock()) {
223 AWTAccessor.getComponentAccessor().processEvent(getTextComponent(), event);
224 }
225 }
226
227 /**
228 * Restoring native behavior. We should sets the selection range to zero,
229 * when component lost its focus.
230 *
231 * @param e the focus event
232 */
233 @Override
234 protected final void handleJavaFocusEvent(final FocusEvent e) {
235 if (e.getID() == FocusEvent.FOCUS_LOST) {
236 // In order to de-select the selection
237 setCaretPosition(getCaretPosition());
238 }
239 super.handleJavaFocusEvent(e);
240 }
241 }