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.event.MouseWheelEvent;
33 import java.awt.peer.ScrollPanePeer;
34 import java.util.List;
35
36 final class LWScrollPanePeer extends LWContainerPeer<ScrollPane, JScrollPane>
37 implements ScrollPanePeer, ChangeListener {
38
39 LWScrollPanePeer(final ScrollPane target,
40 final PlatformComponent platformComponent) {
41 super(target, platformComponent);
42 }
43
44 protected JScrollPane createDelegate() {
45 final JScrollPane sp = new JScrollPane();
46 final JPanel panel = new JPanel();
47 panel.setOpaque(false);
48 panel.setVisible(false);
49 sp.getViewport().setView(panel);
50 sp.setBorder(BorderFactory.createEmptyBorder());
51 sp.getViewport().addChangeListener(this);
52 return sp;
53 }
54
55 @Override
56 public void handleEvent(AWTEvent e) {
57 if (e instanceof MouseWheelEvent) {
58 MouseWheelEvent wheelEvent = (MouseWheelEvent) e;
59 //java.awt.ScrollPane consumes the event
60 // in case isWheelScrollingEnabled() is true,
61 // forcibly send the consumed event to the delegate
62 if (getTarget().isWheelScrollingEnabled() && wheelEvent.isConsumed()) {
63 sendEventToDelegate(wheelEvent);
64 }
65 } else {
66 super.handleEvent(e);
67 }
68 }
69
70 @Override
71 public void stateChanged(final ChangeEvent e) {
72 SwingUtilities.invokeLater(new Runnable() {
73 @Override
74 public void run() {
75 final LWComponentPeer viewPeer = getViewPeer();
76 if (viewPeer != null) {
77 final Rectangle r;
78 synchronized (getDelegateLock()) {
79 r = getDelegate().getViewport().getView().getBounds();
80 }
81 viewPeer.setBounds(r.x, r.y, r.width, r.height, SET_BOUNDS,
82 true, true);
83 }
84 }
85 });
86 }
87
88 @Override
89 void initializeImpl() {
90 super.initializeImpl();
91 final int policy = getTarget().getScrollbarDisplayPolicy();
92 synchronized (getDelegateLock()) {
93 getDelegate().getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
94 getDelegate().setVerticalScrollBarPolicy(convertVPolicy(policy));
95 getDelegate().setHorizontalScrollBarPolicy(convertHPolicy(policy));
96 }
97 }
98
99 LWComponentPeer getViewPeer() {
100 List<LWComponentPeer> peerList = getChildren();
101 return peerList.isEmpty() ? null : peerList.get(0);
102 }
103
104
105 @Override
106 protected Rectangle getContentSize() {
107 Rectangle viewRect = getDelegate().getViewport().getViewRect();
108 return new Rectangle(viewRect.width, viewRect.height);
109 }
110
111 @Override
112 public void layout() {
113 super.layout();
114 synchronized (getDelegateLock()) {
115 LWComponentPeer viewPeer = getViewPeer();
116 if (viewPeer != null) {
117 Component view = getDelegate().getViewport().getView();
118 view.setBounds(viewPeer.getBounds());
119 view.setPreferredSize(viewPeer.getPreferredSize());
120 view.setMinimumSize(viewPeer.getMinimumSize());
121 getDelegate().invalidate();
122 getDelegate().validate();
123 viewPeer.setBounds(view.getBounds());
124 }
125 }
126 }
127
128 @Override
129 public void setScrollPosition(int x, int y) {
130 }
131
132 @Override
133 public int getHScrollbarHeight() {
134 synchronized (getDelegateLock()) {
135 return getDelegate().getHorizontalScrollBar().getHeight();
136 }
137 }
138
139 @Override
140 public int getVScrollbarWidth() {
141 synchronized (getDelegateLock()) {
142 return getDelegate().getVerticalScrollBar().getWidth();
143 }
144 }
145
146 @Override
147 public void childResized(int w, int h) {
148 synchronized (getDelegateLock()) {
149 getDelegate().invalidate();
150 getDelegate().validate();
151 }
152 }
153
154 @Override
155 public void setUnitIncrement(Adjustable adj, int u) {
156 }
157
158 @Override
159 public void setValue(Adjustable adj, int v) {
160 }
161
162 private static int convertHPolicy(final int policy) {
163 switch (policy) {
164 case ScrollPane.SCROLLBARS_NEVER:
165 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER;
166 case ScrollPane.SCROLLBARS_ALWAYS:
167 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS;
168 default:
169 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
170 }
171 }
172
173 private static int convertVPolicy(final int policy) {
174 switch (policy) {
175 case ScrollPane.SCROLLBARS_NEVER:
176 return ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER;
177 case ScrollPane.SCROLLBARS_ALWAYS:
178 return ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
179 default:
180 return ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
181 }
182 }
183 }