/*
* Copyright (c) 1998, 2014, 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.io.File;
import javax.swing.*;
/**
* <code>FileView</code> defines an abstract class that can be implemented
* to provide the filechooser with UI information for a <code>File</code>.
* Each L&F <code>JFileChooserUI</code> object implements this
* class to pass back the correct icons and type descriptions specific to
* that L&F. For example, the Microsoft Windows L&F returns the
* generic Windows icons for directories and generic files.
* Additionally, you may want to provide your own <code>FileView</code> to
* <code>JFileChooser</code> to return different icons or additional
* information using {@link javax.swing.JFileChooser#setFileView}.
*
* <p>
*
* <code>JFileChooser</code> first looks to see if there is a user defined
* <code>FileView</code>, if there is, it gets type information from
* there first. If <code>FileView</code> returns <code>null</code> for
* any method, <code>JFileChooser</code> then uses the L&F specific
* view to get the information.
* So, for example, if you provide a <code>FileView</code> class that
* returns an <code>Icon</code> for JPG files, and returns <code>null</code>
* icons for all other files, the UI's <code>FileView</code> will provide
* default icons for all other files.
*
* <p>
*
* For an example implementation of a simple file view, see
* <code><i>yourJDK</i>/demo/jfc/FileChooserDemo/ExampleFileView.java</code>.
* For more information and examples see
* <a
href="https://docs.oracle.com/javase/tutorial/uiswing/components/filechooser.html">How to Use File Choosers</a>,
* a section in <em>The Java Tutorial</em>.
*
* @see javax.swing.JFileChooser
*
* @author Jeff Dinkins
*
*/
public abstract class FileView {
/**
* The name of the file. Normally this would be simply
* <code>f.getName()</code>.
*
* @param f a {@code File} object
* @return a {@code String} representing the name of the file
*/
public String getName(File f) {
return null;
};
/**
* A human readable description of the file. For example,
* a file named <i>jag.jpg</i> might have a description that read:
* "A JPEG image file of James Gosling's face".
*
* @param f a {@code File} object
* @return a {@code String} containing a description of the file or
* {@code null} if it is not available.
*
*/
public String getDescription(File f) {
return null;
}
/**
* A human readable description of the type of the file. For
* example, a <code>jpg</code> file might have a type description of:
* "A JPEG Compressed Image File"
*
* @param f a {@code File} object
* @return a {@code String} containing a description of the type of the file
* or {@code null} if it is not available .
*/
public String getTypeDescription(File f) {
return null;
}
/**
* The icon that represents this file in the <code>JFileChooser</code>.
*
* @param f a {@code File} object
* @return an {@code Icon} which represents the specified {@code File} or
* {@code null} if it is not available.
*/
public Icon getIcon(File f) {
return null;
}
/**
/**代码未完, 请加载全部代码(NowJava.com).**/