1 /*
2 * Copyright (c) 2011, 2013, 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 /**
37 * Lightweight implementation of {@link ScrollPanePeer}. Delegates most of the
38 * work to the {@link JScrollPane}.
39 */
40 final class LWScrollPanePeer extends LWContainerPeer<ScrollPane, JScrollPane>
41 implements ScrollPanePeer, ChangeListener {
42
43 LWScrollPanePeer(final ScrollPane target,
44 final PlatformComponent platformComponent) {
45 super(target, platformComponent);
46 }
47
48 @Override
49 JScrollPane createDelegate() {
50 final JScrollPane sp = new JScrollPane();
51 final JPanel panel = new JPanel();
52 panel.setOpaque(false);
53 panel.setVisible(false);
54 sp.getViewport().setView(panel);
55 sp.setBorder(BorderFactory.createEmptyBorder());
56 sp.getViewport().addChangeListener(this);
57 return sp;
58 }
59
60 @Override
61 public void handleEvent(AWTEvent e) {
62 if (e instanceof MouseWheelEvent) {
63 MouseWheelEvent wheelEvent = (MouseWheelEvent) e;
64 //java.awt.ScrollPane consumes the event
65 // in case isWheelScrollingEnabled() is true,
66 // forcibly send the consumed event to the delegate
67 if (getTarget().isWheelScrollingEnabled() && wheelEvent.isConsumed()) {
68 sendEventToDelegate(wheelEvent);
69 }
70 } else {
71 super.handleEvent(e);
72 }
73 }
74
75 @Override
76 public void stateChanged(final ChangeEvent e) {
77 SwingUtilities.invokeLater(new Runnable() {
78 @Override
79 public void run() {
80 final LWComponentPeer<?, ?> viewPeer = getViewPeer();
81 if (viewPeer != null) {
82 final Rectangle r;
83 synchronized (getDelegateLock()) {
84 r = getDelegate().getViewport().getView().getBounds();
85 }
86 viewPeer.setBounds(r.x, r.y, r.width, r.height, SET_BOUNDS,
87 true, true);
88 }
89 }
90 });
91 }
92
93 @Override
94 void initializeImpl() {
95 super.initializeImpl();
96 final int policy = getTarget().getScrollbarDisplayPolicy();
97 synchronized (getDelegateLock()) {
98 getDelegate().getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
99 getDelegate().setVerticalScrollBarPolicy(convertVPolicy(policy));
100 getDelegate().setHorizontalScrollBarPolicy(convertHPolicy(policy));
101 }
102 }
103
104 LWComponentPeer<?, ?> getViewPeer() {
105 final List<LWComponentPeer<?, ?>> peerList = getChildren();
106 return peerList.isEmpty() ? null : peerList.get(0);
107 }
108
109 @Override
110 Rectangle getContentSize() {
111 final Rectangle viewRect;
112 synchronized (getDelegateLock()) {
113 viewRect = getDelegate().getViewport().getViewRect();
114 }
115 return new Rectangle(viewRect.width, viewRect.height);
116 }
117
118 @Override
119 public void layout() {
120 super.layout();
121 synchronized (getDelegateLock()) {
122 final LWComponentPeer<?, ?> viewPeer = getViewPeer();
123 if (viewPeer != null) {
124 Component view = getDelegate().getViewport().getView();
125 view.setBounds(viewPeer.getBounds());
126 view.setPreferredSize(viewPeer.getPreferredSize());
127 view.setMinimumSize(viewPeer.getMinimumSize());
128 getDelegate().invalidate();
129 getDelegate().validate();
130 viewPeer.setBounds(view.getBounds());
131 }
132 }
133 }
134
135 @Override
136 public void setScrollPosition(int x, int y) {
137 }
138
139 @Override
140 public int getHScrollbarHeight() {
141 synchronized (getDelegateLock()) {
142 return getDelegate().getHorizontalScrollBar().getHeight();
143 }
144 }
145
146 @Override
147 public int getVScrollbarWidth() {
148 synchronized (getDelegateLock()) {
149 return getDelegate().getVerticalScrollBar().getWidth();
150 }
151 }
152
153 @Override
154 public void childResized(int w, int h) {
155 synchronized (getDelegateLock()) {
156 getDelegate().invalidate();
157 getDelegate().validate();
158 }
159 }
160
161 @Override
162 public void setUnitIncrement(Adjustable adj, int u) {
163 }
164
165 @Override
166 public void setValue(Adjustable adj, int v) {
167 }
168
169 private static int convertHPolicy(final int policy) {
170 switch (policy) {
171 case ScrollPane.SCROLLBARS_NEVER:
172 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER;
173 case ScrollPane.SCROLLBARS_ALWAYS:
174 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS;
175 default:
176 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
177 }
178 }
179
180 private static int convertVPolicy(final int policy) {
181 switch (policy) {
182 case ScrollPane.SCROLLBARS_NEVER:
183 return ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER;
184 case ScrollPane.SCROLLBARS_ALWAYS:
185 return ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
186 default:
187 return ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
188 }
189 }
190 }