1 /*
2 * Copyright (c) 1997, 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
85 * so this optimization is usually worth the performance hit when obscured.
86 * <p>
87 * <strong>Warning:</strong> Swing is not thread safe. For more
88 * information see <a
89 * href="package-summary.html#threading">Swing's Threading
90 * Policy</a>.
91 * <p>
92 * <strong>Warning:</strong>
93 * Serialized objects of this class will not be compatible with
94 * future Swing releases. The current serialization support is
95 * appropriate for short term storage or RMI between applications running
96 * the same version of Swing. As of 1.4, support for long term storage
97 * of all JavaBeans™
98 * has been added to the <code>java.beans</code> package.
99 * Please see {@link java.beans.XMLEncoder}.
100 *
101 * @author Hans Muller
102 * @author Philip Milne
103 * @see JScrollPane
104 */
105 public class JViewport extends JComponent implements Accessible
106 {
107 /**
108 * @see #getUIClassID
109 * @see #readObject
110 */
111 private static final String uiClassID = "ViewportUI";
112
113 /** Property used to indicate window blitting should not be done.
114 */
115 static final Object EnableWindowBlit = "EnableWindowBlit";
116
117 /**
118 * True when the viewport dimensions have been determined.
119 * The default is false.
120 */
121 protected boolean isViewSizeSet = false;
122
123 /**
124 * The last <code>viewPosition</code> that we've painted, so we know how
1279 public void setExtentSize(Dimension newExtent) {
1280 Dimension oldExtent = getExtentSize();
1281 if (!newExtent.equals(oldExtent)) {
1282 setSize(newExtent);
1283 fireStateChanged();
1284 }
1285 }
1286
1287 /**
1288 * A listener for the view.
1289 * <p>
1290 * <strong>Warning:</strong>
1291 * Serialized objects of this class will not be compatible with
1292 * future Swing releases. The current serialization support is
1293 * appropriate for short term storage or RMI between applications running
1294 * the same version of Swing. As of 1.4, support for long term storage
1295 * of all JavaBeans™
1296 * has been added to the <code>java.beans</code> package.
1297 * Please see {@link java.beans.XMLEncoder}.
1298 */
1299 protected class ViewListener extends ComponentAdapter implements Serializable
1300 {
1301 public void componentResized(ComponentEvent e) {
1302 fireStateChanged();
1303 revalidate();
1304 }
1305 }
1306
1307 /**
1308 * Creates a listener for the view.
1309 * @return a <code>ViewListener</code>
1310 */
1311 protected ViewListener createViewListener() {
1312 return new ViewListener();
1313 }
1314
1315
1316 /**
1317 * Subclassers can override this to install a different
1318 * layout manager (or <code>null</code>) in the constructor. Returns
1748 if (accessibleContext == null) {
1749 accessibleContext = new AccessibleJViewport();
1750 }
1751 return accessibleContext;
1752 }
1753
1754 /**
1755 * This class implements accessibility support for the
1756 * <code>JViewport</code> class. It provides an implementation of the
1757 * Java Accessibility API appropriate to viewport user-interface elements.
1758 * <p>
1759 * <strong>Warning:</strong>
1760 * Serialized objects of this class will not be compatible with
1761 * future Swing releases. The current serialization support is
1762 * appropriate for short term storage or RMI between applications running
1763 * the same version of Swing. As of 1.4, support for long term storage
1764 * of all JavaBeans™
1765 * has been added to the <code>java.beans</code> package.
1766 * Please see {@link java.beans.XMLEncoder}.
1767 */
1768 protected class AccessibleJViewport extends AccessibleJComponent {
1769 /**
1770 * Get the role of this object.
1771 *
1772 * @return an instance of AccessibleRole describing the role of
1773 * the object
1774 */
1775 public AccessibleRole getAccessibleRole() {
1776 return AccessibleRole.VIEWPORT;
1777 }
1778 } // inner class AccessibleJViewport
1779 }
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1 /*
2 * Copyright (c) 1997, 2014, 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
85 * so this optimization is usually worth the performance hit when obscured.
86 * <p>
87 * <strong>Warning:</strong> Swing is not thread safe. For more
88 * information see <a
89 * href="package-summary.html#threading">Swing's Threading
90 * Policy</a>.
91 * <p>
92 * <strong>Warning:</strong>
93 * Serialized objects of this class will not be compatible with
94 * future Swing releases. The current serialization support is
95 * appropriate for short term storage or RMI between applications running
96 * the same version of Swing. As of 1.4, support for long term storage
97 * of all JavaBeans™
98 * has been added to the <code>java.beans</code> package.
99 * Please see {@link java.beans.XMLEncoder}.
100 *
101 * @author Hans Muller
102 * @author Philip Milne
103 * @see JScrollPane
104 */
105 @SuppressWarnings("serial") // Same-version serialization only
106 public class JViewport extends JComponent implements Accessible
107 {
108 /**
109 * @see #getUIClassID
110 * @see #readObject
111 */
112 private static final String uiClassID = "ViewportUI";
113
114 /** Property used to indicate window blitting should not be done.
115 */
116 static final Object EnableWindowBlit = "EnableWindowBlit";
117
118 /**
119 * True when the viewport dimensions have been determined.
120 * The default is false.
121 */
122 protected boolean isViewSizeSet = false;
123
124 /**
125 * The last <code>viewPosition</code> that we've painted, so we know how
1280 public void setExtentSize(Dimension newExtent) {
1281 Dimension oldExtent = getExtentSize();
1282 if (!newExtent.equals(oldExtent)) {
1283 setSize(newExtent);
1284 fireStateChanged();
1285 }
1286 }
1287
1288 /**
1289 * A listener for the view.
1290 * <p>
1291 * <strong>Warning:</strong>
1292 * Serialized objects of this class will not be compatible with
1293 * future Swing releases. The current serialization support is
1294 * appropriate for short term storage or RMI between applications running
1295 * the same version of Swing. As of 1.4, support for long term storage
1296 * of all JavaBeans™
1297 * has been added to the <code>java.beans</code> package.
1298 * Please see {@link java.beans.XMLEncoder}.
1299 */
1300 @SuppressWarnings("serial") // Same-version serialization only
1301 protected class ViewListener extends ComponentAdapter implements Serializable
1302 {
1303 public void componentResized(ComponentEvent e) {
1304 fireStateChanged();
1305 revalidate();
1306 }
1307 }
1308
1309 /**
1310 * Creates a listener for the view.
1311 * @return a <code>ViewListener</code>
1312 */
1313 protected ViewListener createViewListener() {
1314 return new ViewListener();
1315 }
1316
1317
1318 /**
1319 * Subclassers can override this to install a different
1320 * layout manager (or <code>null</code>) in the constructor. Returns
1750 if (accessibleContext == null) {
1751 accessibleContext = new AccessibleJViewport();
1752 }
1753 return accessibleContext;
1754 }
1755
1756 /**
1757 * This class implements accessibility support for the
1758 * <code>JViewport</code> class. It provides an implementation of the
1759 * Java Accessibility API appropriate to viewport user-interface elements.
1760 * <p>
1761 * <strong>Warning:</strong>
1762 * Serialized objects of this class will not be compatible with
1763 * future Swing releases. The current serialization support is
1764 * appropriate for short term storage or RMI between applications running
1765 * the same version of Swing. As of 1.4, support for long term storage
1766 * of all JavaBeans™
1767 * has been added to the <code>java.beans</code> package.
1768 * Please see {@link java.beans.XMLEncoder}.
1769 */
1770 @SuppressWarnings("serial") // Same-version serialization only
1771 protected class AccessibleJViewport extends AccessibleJComponent {
1772 /**
1773 * Get the role of this object.
1774 *
1775 * @return an instance of AccessibleRole describing the role of
1776 * the object
1777 */
1778 public AccessibleRole getAccessibleRole() {
1779 return AccessibleRole.VIEWPORT;
1780 }
1781 } // inner class AccessibleJViewport
1782 }
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