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 stateChanged(final ChangeEvent e) {
57 SwingUtilities.invokeLater(new Runnable() {
58 @Override
59 public void run() {
60 final LWComponentPeer viewPeer = getViewPeer();
61 if (viewPeer != null) {
62 final Rectangle r;
63 synchronized (getDelegateLock()) {
64 r = getDelegate().getViewport().getView().getBounds();
65 }
66 viewPeer.setBounds(r.x, r.y, r.width, r.height, SET_BOUNDS,
67 true, true);
68 }
69 }
70 });
71 }
72
73 @Override
74 public void initialize() {
75 super.initialize();
76 final int policy = getTarget().getScrollbarDisplayPolicy();
77 synchronized (getDelegateLock()) {
78 getDelegate().getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
79 getDelegate().setVerticalScrollBarPolicy(convertVPolicy(policy));
80 getDelegate().setHorizontalScrollBarPolicy(convertHPolicy(policy));
81 }
82 }
83
84 LWComponentPeer getViewPeer() {
85 List<LWComponentPeer> peerList = getChildren();
86 return peerList.isEmpty() ? null : peerList.get(0);
87 }
88
89
90 @Override
91 protected Rectangle getContentSize() {
92 Rectangle viewRect = getDelegate().getViewport().getViewRect();
93 return new Rectangle(viewRect.width, viewRect.height);
94 }
95
96 @Override
97 public void layout() {
98 super.layout();
99 synchronized (getDelegateLock()) {
100 LWComponentPeer viewPeer = getViewPeer();
101 if (viewPeer != null) {
102 Component view = getDelegate().getViewport().getView();
103 view.setBounds(viewPeer.getBounds());
104 view.setPreferredSize(viewPeer.getPreferredSize());
105 view.setMinimumSize(viewPeer.getMinimumSize());
106 getDelegate().invalidate();
107 getDelegate().validate();
108 viewPeer.setBounds(view.getBounds());
109 }
110 }
111 }
112
113 @Override
114 public void handleEvent(AWTEvent e) {
115 if (e instanceof MouseWheelEvent
116 && !getTarget().isWheelScrollingEnabled()) {
117 return;
118 }
119 super.handleEvent(e);
120 }
121
122 @Override
123 public boolean handlesWheelScrolling() {
124 return isVerticalBarVisible() || isHorizontalBarVisible();
125 }
126
127
128 private boolean isVerticalBarVisible() {
129 synchronized (getDelegateLock()) {
130 JScrollBar verticalScrollBar = getDelegate().getVerticalScrollBar();
131 return verticalScrollBar != null && verticalScrollBar.isVisible();
132 }
133 }
134
135 private boolean isHorizontalBarVisible() {
136 synchronized (getDelegateLock()) {
137 JScrollBar horizontalScrollBar = getDelegate().getHorizontalScrollBar();
138 return horizontalScrollBar != null && horizontalScrollBar.isVisible();
139 }
140 }
141
142 @Override
143 public Insets getInsets() {
144 if (getViewPeer() != null) {
145 synchronized (getDelegateLock()) {
146 int right = isVerticalBarVisible() ? getVScrollbarWidth() : 0;
147 int bottom = isHorizontalBarVisible() ? getHScrollbarHeight() : 0;
148 return new Insets(0, 0, bottom, right);
149 }
150 }
151 return new Insets(0, 0, 0, 0);
152 }
153
154
155 @Override
156 public void setScrollPosition(int x, int y) {
157 synchronized (getDelegateLock()) {
158 getDelegate().getViewport().setViewPosition(new Point(x, y));
159 }
160 }
161
162 @Override
163 public int getHScrollbarHeight() {
164 synchronized (getDelegateLock()) {
165 JScrollBar horizontalScrollBar = getDelegate().getHorizontalScrollBar();
166 return horizontalScrollBar != null ? horizontalScrollBar.getHeight() : 0;
167 }
168 }
169
170 @Override
171 public int getVScrollbarWidth() {
172 synchronized (getDelegateLock()) {
173 JScrollBar verticalScrollBar = getDelegate().getVerticalScrollBar();
174 return verticalScrollBar != null ? verticalScrollBar.getWidth() : 0;
175 }
176 }
177
178 @Override
179 public void childResized(int w, int h) {
180 synchronized (getDelegateLock()) {
181 getDelegate().invalidate();
182 getDelegate().validate();
183 }
184 }
185
186 @Override
187 public void setUnitIncrement(Adjustable adj, int u) {
188 }
189
190 @Override
191 public void setValue(Adjustable adj, int v) {
192 LWComponentPeer c = getViewPeer();
193 if (c == null) {
194 return;
195 }
196 Point p = c.getTarget().getLocation();
197 switch (adj.getOrientation()) {
198 case Adjustable.VERTICAL:
199 setScrollPosition(-(p.x), v);
200 break;
201 case Adjustable.HORIZONTAL:
202 setScrollPosition(v, (-p.y));
203 break;
204 }
205 }
206
207 private static int convertHPolicy(final int policy) {
208 switch (policy) {
209 case ScrollPane.SCROLLBARS_NEVER:
210 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER;
211 case ScrollPane.SCROLLBARS_ALWAYS:
212 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS;
213 default:
214 return ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
215 }
216 }
217
218 private static int convertVPolicy(final int policy) {
219 switch (policy) {
220 case ScrollPane.SCROLLBARS_NEVER:
221 return ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER;
222 case ScrollPane.SCROLLBARS_ALWAYS:
223 return ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
224 default:
225 return ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
226 }
227 }
228 }