--- /dev/null 2018-09-28 14:23:17.000000000 +0530 +++ new/src/java.desktop/share/classes/javax/swing/filechooser/SystemIcon.java 2018-09-28 14:23:14.837001900 +0530 @@ -0,0 +1,265 @@ +/* + * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +package javax.swing.filechooser; + +import java.awt.Image; +import javax.swing.Icon; +import javax.swing.ImageIcon; +import javax.swing.JFileChooser; +import javax.swing.UIManager; +import sun.awt.shell.ShellFolder; +import java.awt.RenderingHints; +import java.awt.image.BufferedImage; +import java.awt.Graphics2D; +import java.awt.GraphicsConfiguration; +import java.awt.GraphicsDevice; +import java.awt.GraphicsEnvironment; +import java.io.FileNotFoundException; +import java.awt.Transparency; +import java.io.File; +import java.io.IOException; +import java.awt.image.MultiResolutionImage; +import java.awt.image.BaseMultiResolutionImage; + +/** + * SystemIcon is JFileChooser's gateway to the + * file system icons. + * + *

+ * + * @author shashidhara + */ +public class SystemIcon extends FileSystemView { + + /** + * Store the reference to the file + */ + protected final File file; + + /** + * Create a reference to the file + */ + public SystemIcon() { + this(null); + } + + /** + * Stere the reference to the file + * + * @param f a File object + */ + public SystemIcon(File f) { + this.file = f; + } + + /** + * Icon for a file, directory, or folder as it would be displayed in + * a system file browser. Example from Windows: the "M:\" directory + * displays a CD-ROM icon. + * + * The default implementation gets information from the ShellFolder class. + * + * @param f a File object + * @return an icon as it would be displayed by a native file chooser + * @see JFileChooser#getIcon + * @since 12 + */ + public Icon getSystemIcon() { + if (this.file == null) { + return null; + } + + return getSystemIcon(this.file); + } + + /** + * Scaled icon for a file, directory, or folder as it would be displayed in + * a system file browser. Example from Windows: the "M:\" directory + * displays a CD-ROM icon. + * + * The default implementation gets information from the ShellFolder class. + * + * @param f a File object + * @param width width of the icon in pixels to be scaled(valid range: 1 to 256) + * @param height height of the icon in pixels to be scaled(valid range: 1 to 256) + * @return an icon as it would be displayed by a native file chooser + * @see JFileChooser#getIcon + * @since 12 + */ + public Icon getSystemIcon(int width, int height) { + if (this.file == null) { + return null; + } + + return getSystemIcon(this.file, width, height); + } + + /** + * Scaled icon for a file, directory, or folder as it would be displayed in + * a system file browser. Example from Windows: the "M:\" directory + * displays a CD-ROM icon. + * + * The default implementation gets information from the ShellFolder class. + * + * @param f a File object + * @param size width and height of the icon in pixels to be scaled(valid range: 1 to 256) + * @return an icon as it would be displayed by a native file chooser + * @see JFileChooser#getIcon + * @since 12 + */ + public Icon getSystemIcon(int size) { + if(this.file == null) { + return null; + } + + return getSystemIcon(this.file, size, size); + } + + private int getSize(File f, int width, int height) { + if (f == null) { + throw new IllegalArgumentException("File reference is null"); + } + + if ((width > 256 || width < 1) || (height > 256 || height < 1)) { + throw new IllegalArgumentException("Icon width and height must be within 1 and 256"); + } + + int size = Math.max(width, height); + + return size; + } + + /** + * Returns scaled icon for a file, directory, or folder as it would be displayed in + * a system file browser. Example from Windows: the "M:\" directory + * displays a CD-ROM icon. + * + * @param f a File object + * @param width width of the icon in pixels(valid range: 1 to 256) + * @param height height of the icon in pixels(valid range: 1 to 256) + * @return an icon of the requested size(possibly scaled) as it would be displayed by a native file chooser + * @throws IllegalArgumentException if file reference is null + * @throws IllegalArgumentException if icon width or height is outside of range 1 to 256 + * @see JFileChooser#getIcon + * @since 12 + */ + public Icon getSystemIcon(File f, int width, int height) { + int size = getSize(f, width, height); + Icon icon = getSystemIcon(f, size); + Image scaledImg = null; + + // scale the icon to the required size + if (icon != null) { + scaledImg = scaleIconImage(icon, width, height); + } + + if (scaledImg != null) { + return new ImageIcon(scaledImg); + } + + return null; + } + + /** + * Returns scaled icon for a file, directory, or folder as it would be displayed in + * a system file browser. Example from Windows: the "M:\" directory + * displays a CD-ROM icon. + * + * @param f a File object + * @param width width of the icon in pixels(valid range: 1 to 256) + * @param height height of the icon in pixels(valid range: 1 to 256) + * @return an multi resolution image icons containing original icon and scaled icon + * @see JFileChooser#getIcon + * @since 12 + */ + public MultiResolutionImage getSystemIcons(File f, int width, int height) { + Image[] imageArray; + int size = getSize(f, width, height); + Icon icon = getSystemIcon(f, size); + Image scaledImg = null; + + // scale the icon to the required size + if (icon != null) { + scaledImg = scaleIconImage(icon, width, height); + } + + if (scaledImg != null) { + imageArray = new Image[2]; + + if (icon instanceof ImageIcon) { + imageArray[0] = ((ImageIcon)icon).getImage(); // store the original icon returned from the system + } else { + BufferedImage image = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_RGB); + icon.paintIcon(null, image.getGraphics(), 0, 0); + imageArray[0] = (Image)image; // store the original icon returned from the system + } + imageArray[1] = scaledImg; // store the scaled up icon + + return new BaseMultiResolutionImage(imageArray); + } + + return null; + } + + private static Image scaleIconImage(Icon srcIcon, int scaledW, int scaledH) { + if (srcIcon == null) { + return null; + } + + int w; + int h; + + w = srcIcon.getIconWidth(); + h = srcIcon.getIconHeight(); + + GraphicsEnvironment ge = + GraphicsEnvironment.getLocalGraphicsEnvironment(); + GraphicsDevice gd = ge.getDefaultScreenDevice(); + GraphicsConfiguration gc = gd.getDefaultConfiguration(); + + // convert to image + BufferedImage iconImage = gc.createCompatibleImage(w, h, + Transparency.TRANSLUCENT); + Graphics2D g = iconImage.createGraphics(); + srcIcon.paintIcon(null, g, 0, 0); + g.dispose(); + + // and scale it nicely + BufferedImage scaledImage = gc.createCompatibleImage(scaledW, scaledH, + Transparency.TRANSLUCENT); + g = scaledImage.createGraphics(); + g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, + RenderingHints.VALUE_INTERPOLATION_BILINEAR); + g.drawImage(iconImage, 0, 0, scaledW, scaledH, null); + g.dispose(); + + return (Image)scaledImage; + } + + public File createNewFolder(File containingDir) throws IOException { + return null; + } +}