1 /*
2 * Copyright (c) 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.swing;
27
28 import java.awt.BorderLayout;
29 import java.awt.Color;
30 import java.awt.Component;
31 import java.awt.Container;
32 import java.awt.EventQueue;
33 import java.awt.Graphics;
34 import java.awt.Graphics2D;
35 import java.awt.Rectangle;
36 import java.awt.image.BufferedImage;
37 import java.awt.image.DataBufferInt;
38
39 import javax.swing.JLayeredPane;
40 import javax.swing.JPanel;
41 import javax.swing.JRootPane;
42 import javax.swing.RootPaneContainer;
43
44 import sun.awt.LightweightFrame;
45
46 /**
47 * The frame serves as a lightweight container which paints its content to an offscreen image
48 * and provides access to the image's data via the {@link LightweightContent} interface.
49 * Note, that it may not be shown as a standalone toplevel frame. Its purpose is to provide
50 * functionality for lightweight embedding.
51 *
52 * @author Artem Ananiev
53 * @author Anton Tarasov
54 */
55 public final class JLightweightFrame extends LightweightFrame implements RootPaneContainer {
56
57 private final JRootPane rootPane = new JRootPane();
58
59 private LightweightContent content;
60
61 private Component component;
62 private JPanel contentPane;
63
64 private BufferedImage bbImage;
65
66 /**
67 * Constructs a new, initially invisible {@code JLightweightFrame} instance.
68 */
69 public JLightweightFrame() {
70 super();
71 add(rootPane, BorderLayout.CENTER);
72 setBackground(new Color(0, 0, 0, 0));
73 }
74
75 /**
76 * Sets the {@link LightweightContent} instance for this frame.
77 * The {@code JComponent} object returned by the {@link LightweightContent#getComponent()}
78 * method is immediately added to the frame's content pane.
79 *
80 * @param content the {@link LightweightContent} instance
81 */
82 public void setContent(LightweightContent content) {
83 this.content = content;
84 this.component = content.getComponent();
85
86 initInterior();
87 }
88
89 @Override
90 public Graphics getGraphics() {
91 if (bbImage == null) return null;
92
93 Graphics2D g = bbImage.createGraphics();
94 g.setBackground(getBackground());
95 g.setColor(getForeground());
96 g.setFont(getFont());
97 return g;
98 }
99
100 @Override
101 public void grabFocus() {
102 super.grabFocus();
103 if (content != null) {
104 content.focusGrabbed();
105 }
106 }
107
108 @Override
109 public void ungrabFocus(boolean postEvent) {
110 super.ungrabFocus(postEvent);
111 if (content != null) {
112 content.focusUngrabbed();
113 }
114 }
115
116 private void initInterior() {
117 contentPane = new JPanel() {
118 @Override
119 public void paint(Graphics g) {
120 content.paintLock();
121 try {
122 super.paint(g);
123
124 final Rectangle clip = g.getClipBounds() != null ?
125 g.getClipBounds() : new Rectangle(0, 0, contentPane.getWidth(), contentPane.getHeight());
126
127 clip.x = Math.max(0, clip.x);
128 clip.y = Math.max(0, clip.y);
129 clip.width = Math.min(contentPane.getWidth(), clip.width);
130 clip.height = Math.min(contentPane.getHeight(), clip.height);
131
132 EventQueue.invokeLater(new Runnable() {
133 @Override
134 public void run() {
135 content.imageUpdated(clip.x, clip.y, clip.width, clip.height);
136 }
137 });
138 } finally {
139 content.paintUnlock();
140 }
141 }
142 @Override
143 protected boolean isPaintingOrigin() {
144 return true;
145 }
146 };
147 contentPane.setLayout(new BorderLayout());
148 contentPane.add(component);
149 setContentPane(contentPane);
150 }
151
152 @SuppressWarnings("deprecation")
153 @Override public void reshape(int x, int y, int width, int height) {
154 super.reshape(x, y, width, height);
155
156 if (width == 0 || height == 0) {
157 return;
158 }
159
160 content.paintLock();
161 try {
162 if ((bbImage == null) || (width != bbImage.getWidth()) || (height != bbImage.getHeight())) {
163 boolean createBB = true;
164 int newW = width;
165 int newH = height;
166 if (bbImage != null) {
167 int oldW = bbImage.getWidth();
168 int oldH = bbImage.getHeight();
169 if ((oldW >= newW) && (oldH >= newH)) {
170 createBB = false;
171 } else {
172 if (oldW >= newW) {
173 newW = oldW;
174 } else {
175 newW = Math.max((int)(oldW * 1.2), width);
176 }
177 if (oldH >= newH) {
178 newH = oldH;
179 } else {
180 newH = Math.max((int)(oldH * 1.2), height);
181 }
182 }
183 }
184 if (createBB) {
185 BufferedImage oldBB = bbImage;
186 bbImage = new BufferedImage(newW, newH, BufferedImage.TYPE_INT_ARGB_PRE);
187 if (oldBB != null) {
188 Graphics g = bbImage.getGraphics();
189 try {
190 g.drawImage(oldBB, 0, 0, newW, newH, null);
191 } finally {
192 g.dispose();
193 oldBB.flush();
194 }
195 }
196 DataBufferInt dataBuf = (DataBufferInt)bbImage.getRaster().getDataBuffer();
197 content.imageBufferReset(dataBuf.getData(), 0, 0, width, height, bbImage.getWidth());
198 } else {
199 content.imageReshaped(0, 0, width, height);
200 }
201 }
202 } finally {
203 content.paintUnlock();
204 }
205 }
206
207 @Override
208 public JRootPane getRootPane() {
209 return rootPane;
210 }
211
212 @Override
213 public void setContentPane(Container contentPane) {
214 getRootPane().setContentPane(contentPane);
215 }
216
217 @Override
218 public Container getContentPane() {
219 return getRootPane().getContentPane();
220 }
221
222 @Override
223 public void setLayeredPane(JLayeredPane layeredPane) {
224 getRootPane().setLayeredPane(layeredPane);
225 }
226
227 @Override
228 public JLayeredPane getLayeredPane() {
229 return getRootPane().getLayeredPane();
230 }
231
232 @Override
233 public void setGlassPane(Component glassPane) {
234 getRootPane().setGlassPane(glassPane);
235 }
236
237 @Override
238 public Component getGlassPane() {
239 return getRootPane().getGlassPane();
240 }
241 }