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 package sun.lwawt;
27
28 import javax.swing.*;
29 import javax.swing.event.ChangeListener;
30 import javax.swing.event.ChangeEvent;
31 import java.awt.*;
32 import java.awt.peer.ScrollPanePeer;
33 import java.util.List;
34
35 final class LWScrollPanePeer extends LWContainerPeer<ScrollPane, JScrollPane>
36 implements ScrollPanePeer, ChangeListener {
37
38 LWScrollPanePeer(final ScrollPane target,
39 final PlatformComponent platformComponent) {
40 super(target, platformComponent);
41 }
42
43 protected JScrollPane createDelegate() {
44 final JScrollPane sp = new JScrollPane();
45 final JPanel panel = new JPanel();
46 panel.setOpaque(false);
47 panel.setVisible(false);
48 sp.getViewport().setView(panel);
49 sp.setBorder(BorderFactory.createEmptyBorder());
50 sp.getViewport().addChangeListener(this);
51 return sp;
52 }
53
54 @Override
55 public void stateChanged(final ChangeEvent e) {
56 SwingUtilities.invokeLater(new Runnable() {
57 @Override
58 public void run() {
59 final LWComponentPeer viewPeer = getViewPeer();
60 if (viewPeer != null) {
61 final Rectangle r;
62 synchronized (getDelegateLock()) {
63 r = getDelegate().getViewport().getView().getBounds();
64 }
65 viewPeer.setBounds(r.x, r.y, r.width, r.height, SET_BOUNDS,
66 true, true);
67 }
68 }
69 });
70 }
71
72 @Override
73 public void initialize() {
74 super.initialize();
75 final int policy = getTarget().getScrollbarDisplayPolicy();
76 synchronized (getDelegateLock()) {
77 getDelegate().getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
78 getDelegate().setVerticalScrollBarPolicy(convertVPolicy(policy));
79 getDelegate().setHorizontalScrollBarPolicy(convertHPolicy(policy));
80 }
81 }
82
83 LWComponentPeer getViewPeer() {
84 List<LWComponentPeer> peerList = getChildren();
85 return peerList.isEmpty() ? null : peerList.get(0);
86 }
87
88
89 @Override
90 protected Rectangle getContentSize() {
91 Rectangle viewRect = getDelegate().getViewport().getViewRect();
92 return new Rectangle(viewRect.width, viewRect.height);
93 }
94
95 @Override
96 public void layout() {
97 super.layout();
98 synchronized (getDelegateLock()) {
99 LWComponentPeer viewPeer = getViewPeer();
100 if (viewPeer != null) {
101 Component view = getDelegate().getViewport().getView();
102 view.setBounds(viewPeer.getBounds());
103 view.setPreferredSize(viewPeer.getPreferredSize());
104 view.setMinimumSize(viewPeer.getMinimumSize());
105 getDelegate().invalidate();
106 getDelegate().validate();
107 viewPeer.setBounds(view.getBounds());
108 }
109 }
110 }
111
112 @Override
113 public void setScrollPosition(int x, int y) {
114 }
115
116 @Override
117 public int getHScrollbarHeight() {
118 synchronized (getDelegateLock()) {
119 return getDelegate().getHorizontalScrollBar().getHeight();
120 }
121 }
122
123 @Override
124 public int getVScrollbarWidth() {
125 synchronized (getDelegateLock()) {
126 return getDelegate().getVerticalScrollBar().getWidth();
127 }
128 }
129
130 @Override
131 public void childResized(int w, int h) {
132 synchronized (getDelegateLock()) {
133 getDelegate().invalidate();
134 getDelegate().validate();
135 }
136 }
137
138 @Override
139 public void setUnitIncrement(Adjustable adj, int u) {
140 }
141
142 @Override
143 public void setValue(Adjustable adj, int v) {
144 }
145
146 private static int convertHPolicy(final int policy) {
147 switch (policy) {
148 case ScrollPane.SCROLLBARS_NEVER:
149 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER;
150 case ScrollPane.SCROLLBARS_ALWAYS:
151 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS;
152 default:
153 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
154 }
155 }
156
157 private static int convertVPolicy(final int policy) {
158 switch (policy) {
159 case ScrollPane.SCROLLBARS_NEVER:
160 return ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER;
161 case ScrollPane.SCROLLBARS_ALWAYS:
162 return ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
163 default:
164 return ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
165 }
166 }
167 }