1 /*
2 * Copyright (c) 2018, 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 javax.swing.filechooser;
27
28 import java.awt.Image;
29 import javax.swing.Icon;
30 import javax.swing.ImageIcon;
31 import javax.swing.JFileChooser;
32 import javax.swing.UIManager;
33 import sun.awt.shell.ShellFolder;
34 import java.awt.RenderingHints;
35 import java.awt.image.BufferedImage;
36 import java.awt.Graphics2D;
37 import java.awt.GraphicsConfiguration;
38 import java.awt.GraphicsDevice;
39 import java.awt.GraphicsEnvironment;
40 import java.io.FileNotFoundException;
41 import java.awt.Transparency;
42 import java.io.File;
43 import java.io.IOException;
44 import java.awt.image.MultiResolutionImage;
45 import java.awt.image.BaseMultiResolutionImage;
46
47 /**
48 * SystemIcon is JFileChooser's gateway to the
49 * file system icons.
50 *
51 * <p>
52 *
53 * @author shashidhara
54 */
55 public class SystemIcon extends FileSystemView {
56
57 /**
58 * Store the reference to the file
59 */
60 protected File file;
61
62 /**
63 * Create a reference to the file
64 */
65 public SystemIcon() {
66 this.file = null;
67 }
68
69 /**
70 * Stere the reference to the file
71 *
72 * @param f a <code>File</code> object
73 */
74 public SystemIcon(File f) {
75 this.file = f;
76 }
77
78 /**
79 * Icon for a file, directory, or folder as it would be displayed in
80 * a system file browser. Example from Windows: the "M:\" directory
81 * displays a CD-ROM icon.
82 *
83 * The default implementation gets information from the ShellFolder class.
84 *
85 * @param f a <code>File</code> object
86 * @return an icon as it would be displayed by a native file chooser
87 * @see JFileChooser#getIcon
88 * @since 12
89 */
90 public Icon getSystemIcon() {
91 if(this.file == null) {
92 return null;
93 }
94
95 return getSystemIcon(this.file);
96 }
97
98 /**
99 * Scaled icon for a file, directory, or folder as it would be displayed in
100 * a system file browser. Example from Windows: the "M:\" directory
101 * displays a CD-ROM icon.
102 *
103 * The default implementation gets information from the ShellFolder class.
104 *
105 * @param f a <code>File</code> object
106 * @param width width of the icon in pixels to be scaled(valid range: 1 to 256)
107 * @param height height of the icon in pixels to be scaled(valid range: 1 to 256)
108 * @return an icon as it would be displayed by a native file chooser
109 * @see JFileChooser#getIcon
110 * @since 12
111 */
112 public Icon getSystemIcon(int width, int height) {
113 if(this.file == null) {
114 return null;
115 }
116
117 return getSystemIcon(this.file, width, height);
118 }
119
120 /**
121 * Scaled icon for a file, directory, or folder as it would be displayed in
122 * a system file browser. Example from Windows: the "M:\" directory
123 * displays a CD-ROM icon.
124 *
125 * The default implementation gets information from the ShellFolder class.
126 *
127 * @param f a <code>File</code> object
128 * @param size width and height of the icon in pixels to be scaled(valid range: 1 to 256)
129 * @return an icon as it would be displayed by a native file chooser
130 * @see JFileChooser#getIcon
131 * @since 12
132 */
133 public Icon getSystemIcon(int size) {
134 if(this.file == null) {
135 return null;
136 }
137
138 return getSystemIcon(this.file, size, size);
139 }
140
141 /**
142 * Scaled icon for a file, directory, or folder as it would be displayed in
143 * a system file browser. Example from Windows: the "M:\" directory
144 * displays a CD-ROM icon.
145 *
146 * The default implementation gets information from the ShellFolder class.
147 *
148 * @param f a <code>File</code> object
149 * @param width width of the icon in pixels to be scaled(valid range: 1 to 256)
150 * @param height height of the icon in pixels to be scaled(valid range: 1 to 256)
151 * @return an icon as it would be displayed by a native file chooser
152 * @see JFileChooser#getIcon
153 * @since 12
154 */
155 public Icon getSystemIcon(File f, int width, int height) {
156 if (f == null) {
157 return null;
158 }
159
160 if((width > 256 || width < 1) || (height > 256 || height < 1)) {
161 return null;
162 }
163
164 int size;
165 if(width > height) {
166 size = width;
167 } else {
168 size = height;
169 }
170
171 Icon icon = getSystemIcon(f, size);
172 Image scaledImg = null;
173
174 // scale the icon to the required size
175 if(icon != null) {
176 scaledImg = scaleIconImage(icon, width, height);
177 }
178
179 if (scaledImg != null) {
180 return new ImageIcon(scaledImg);
181 }
182
183 return null;
184 }
185
186 /**
187 * Scaled icon for a file, directory, or folder as it would be displayed in
188 * a system file browser. Example from Windows: the "M:\" directory
189 * displays a CD-ROM icon.
190 *
191 * The default implementation gets information from the ShellFolder class.
192 *
193 * @param f a <code>File</code> object
194 * @param width width of the icon in pixels to be scaled(valid range: 1 to 256)
195 * @param height height of the icon in pixels to be scaled(valid range: 1 to 256)
196 * @return an multi resolution image icons as it would be displayed by a native file chooser
197 * @see JFileChooser#getIcon
198 * @since 12
199 */
200 public MultiResolutionImage getSystemIcons(File f, int width, int height) {
201 Image[] imageArray;
202 if (f == null) {
203 return null;
204 }
205
206 if((width > 256 || width < 1) || (height > 256 || height < 1)) {
207 return null;
208 }
209
210 int size;
211 if(width > height) {
212 size = width;
213 } else {
214 size = height;
215 }
216
217 Icon icon = getSystemIcon(f, size);
218 Image scaledImg = null;
219
220 // scale the icon to the required size
221 if(icon != null) {
222 scaledImg = scaleIconImage(icon, width, height);
223 }
224
225 if(scaledImg != null) {
226 imageArray = new Image[2];
227
228 if(icon instanceof ImageIcon) {
229 imageArray[0] = ((ImageIcon)icon).getImage(); // store the original icon returned from the system
230 } else {
231 BufferedImage image = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_RGB);
232 icon.paintIcon(null, image.getGraphics(), 0, 0);
233 imageArray[0] = (Image)image; // store the original icon returned from the system
234 }
235 imageArray[1] = scaledImg; // store the scaled up icon
236
237 return new BaseMultiResolutionImage(imageArray);
238 }
239
240 return null;
241 }
242
243 private static Image scaleIconImage(Icon srcIcon, int scaledW, int scaledH) {
244 if (srcIcon == null) {
245 return null;
246 }
247
248 int w;
249 int h;
250
251 w = srcIcon.getIconWidth();
252 h = srcIcon.getIconHeight();
253
254 GraphicsEnvironment ge =
255 GraphicsEnvironment.getLocalGraphicsEnvironment();
256 GraphicsDevice gd = ge.getDefaultScreenDevice();
257 GraphicsConfiguration gc = gd.getDefaultConfiguration();
258
259 // convert to image
260 BufferedImage iconImage = gc.createCompatibleImage(w, h,
261 Transparency.TRANSLUCENT);
262 Graphics2D g = iconImage.createGraphics();
263 srcIcon.paintIcon(null, g, 0, 0);
264 g.dispose();
265
266 // and scale it nicely
267 BufferedImage scaledImage = gc.createCompatibleImage(scaledW, scaledH,
268 Transparency.TRANSLUCENT);
269 g = scaledImage.createGraphics();
270 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
271 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
272 g.drawImage(iconImage, 0, 0, scaledW, scaledH, null);
273 g.dispose();
274
275 return (Image)scaledImage;
276 }
277
278 public File createNewFolder(File containingDir) throws IOException {
279 return null;
280 }
281 }