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TrueZIP is a Java based Virtual File System (VFS) to enable transparent, multi-threaded read/write access to archive files (ZIP, TAR etc.) as if they were directories. Archive files may be arbitrarily nested and the nesting level is only limited by heap and file system size.

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/*
 * Copyright (C) 2006-2010 Schlichtherle IT Services
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.schlichtherle.io.swing.tree;

import de.schlichtherle.io.swing.*;

import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;

/**
 * A {@link javax.swing.tree.TreeCellRenderer} which uses an instance of
 * {@link FileSystemView} to display the system icon for each node in a
 * {@link JFileTree} wherever possible.
 *
 * @author Christian Schlichtherle
 * @version $Id: FileTreeCellRenderer.java,v 1.3 2010/08/16 10:55:48 christian_schlichtherle Exp $
 * @since TrueZIP 5.1
 */
public class FileTreeCellRenderer extends DefaultTreeCellRenderer {

    private final JFileTree fileTree;
    
    public FileTreeCellRenderer(final JFileTree fileTree) {
        this.fileTree = fileTree;
    }

    public Icon getOpenIcon() {
        // This is a hack: When editing a node, the edited node is the ONLY
        // one for which the BasicTreeUI somehow BYPASSES the call to
        // getTreeCellRendererComponent(*) and calls this method directly in
        // order to determine the icon to draw for the edited node.
        // So we simply return the icon for the edited node for ALL nodes
        // while editing and rely on getTreeCellRendererComponent(*) to fix
        // the icon for all other nodes than the edited one.
        final java.io.File node = fileTree.getEditedNode();
        return node != null
                ? FileSystemView.getFileSystemView().getSystemIcon(node)
                : super.getOpenIcon();
    }

    public Icon getClosedIcon() {
        // This is a hack: When editing a node, the edited node is the ONLY
        // one for which the BasicTreeUI somehow BYPASSES the call to
        // getTreeCellRendererComponent(*) and calls this method directly in
        // order to determine the icon to draw for the edited node.
        // So we simply return the icon for the edited node for ALL nodes
        // while editing and rely on getTreeCellRendererComponent(*) to fix
        // the icon for all other nodes than the edited one.
        final java.io.File node = fileTree.getEditedNode();
        return node != null
                ? FileSystemView.getFileSystemView().getSystemIcon(node)
                : super.getClosedIcon();
    }

    public Icon getLeafIcon() {
        // This is a hack: When editing a node, the edited node is the ONLY
        // one for which the BasicTreeUI somehow BYPASSES the call to
        // getTreeCellRendererComponent(*) and calls this method directly in
        // order to determine the icon to draw for the edited node.
        // So we simply return the icon for the edited node for ALL nodes
        // while editing and rely on getTreeCellRendererComponent(*) to fix
        // the icon for all other nodes than the edited one.
        final java.io.File node = fileTree.getEditedNode();
        return node != null
                ? FileSystemView.getFileSystemView().getSystemIcon(node)
                : super.getLeafIcon();
    }

    public Component getTreeCellRendererComponent(
            final JTree tree,
            final Object value,
            final boolean selected,
            final boolean expanded,
            final boolean leaf,
            final int row,
            final boolean hasFocus) {
        super.getTreeCellRendererComponent(
                tree, value, selected, expanded, leaf, row, hasFocus);
        setIcon(FileSystemView.getFileSystemView().getSystemIcon((java.io.File) value));
        return this;
    }
}