io.neocdtv.simpleplayer.ui.PlaylistTransferHandler.java Source code

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/*
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package io.neocdtv.simpleplayer.ui;

/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
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 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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/*
 * ListTransferHandler.java is used by the DropDemo example.
 */
import io.neocdtv.simpleplayer.init.LookAndFeelConfigurator;
import javax.swing.*;
import java.awt.datatransfer.*;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.io.FileUtils;

public class PlaylistTransferHandler extends TransferHandler {

    private final static Logger LOGGER = Logger.getLogger(LookAndFeelConfigurator.class.getName());

    private int[] indices = null;
    private int addIndex = -1; //Location where items were added
    private int addCount = 0; //Number of items added.

    @Override
    public boolean canImport(TransferHandler.TransferSupport info) {
        return info.isDataFlavorSupported(DataFlavor.javaFileListFlavor);
    }

    @Override
    protected Transferable createTransferable(JComponent c) {
        return new StringSelection(exportString(c));
    }

    @Override
    public int getSourceActions(JComponent c) {
        return TransferHandler.COPY_OR_MOVE;
    }

    @Override
    public boolean importData(TransferHandler.TransferSupport info) {
        if (!info.isDrop()) {
            return false;
        }

        JList list = (JList) info.getComponent();
        DefaultListModel<PlaylistEntry> listModel = (DefaultListModel) list.getModel();
        JList.DropLocation dropLocation = (JList.DropLocation) info.getDropLocation();

        // Get the string that is being dropped.
        Transferable transferable = info.getTransferable();
        List<File> data;
        try {
            data = (List<File>) transferable.getTransferData(DataFlavor.javaFileListFlavor);
            for (File file : data) {
                if (file.isDirectory()) {
                    final boolean recursive = true;
                    final String[] fileExtensionFilter = null;
                    final List<File> listFiles = Arrays.asList(FileUtils.convertFileCollectionToFileArray(
                            FileUtils.listFiles(file, fileExtensionFilter, recursive)));
                    for (File o : listFiles) {
                        listModel.addElement(buildEntry(o));
                    }
                } else {
                    listModel.addElement(buildEntry(file));
                }
            }
        } catch (UnsupportedFlavorException | IOException ex) {
            LOGGER.log(Level.SEVERE, null, ex);
            return false;
        }
        return true;
    }

    private PlaylistEntry buildEntry(final File file) {
        final PlaylistEntry entry = new PlaylistEntry(file.getName(), file.getAbsolutePath());
        return entry;
    }

    @Override
    protected void exportDone(JComponent c, Transferable data, int action) {
        cleanup(c, action == TransferHandler.MOVE);
    }

    protected String exportString(JComponent c) {
        JList list = (JList) c;
        indices = list.getSelectedIndices();
        List values = list.getSelectedValuesList();

        StringBuilder buff = new StringBuilder();

        for (int i = 0; i < values.size(); i++) {
            Object val = values.get(i);
            buff.append(val == null ? "" : val.toString());
            if (i != values.size() - 1) {
                buff.append("\n");
            }
        }

        return buff.toString();
    }

    //Take the incoming string and wherever there is a
    //newline, break it into a separate item in the list.
    protected void importString(JComponent c, String str) {
        JList target = (JList) c;
        DefaultListModel listModel = (DefaultListModel) target.getModel();
        int index = target.getSelectedIndex();

        //Prevent the user from dropping data back on itself.
        //For example, if the user is moving items #4,#5,#6 and #7 and
        //attempts to insert the items after item #5, this would
        //be problematic when removing the original items.
        //So this is not allowed.
        if (indices != null && index >= indices[0] - 1 && index <= indices[indices.length - 1]) {
            indices = null;
            return;
        }

        int max = listModel.getSize();
        if (index < 0) {
            index = max;
        } else {
            index++;
            if (index > max) {
                index = max;
            }
        }
        addIndex = index;
        String[] values = str.split("\n");
        addCount = values.length;
        for (String value : values) {
            listModel.add(index++, value);
        }
    }

    //If the remove argument is true, the drop has been
    //successful and it's time to remove the selected items 
    //from the list. If the remove argument is false, it
    //was a Copy operation and the original list is left
    //intact.
    protected void cleanup(JComponent c, boolean remove) {
        if (remove && indices != null) {
            JList source = (JList) c;
            DefaultListModel model = (DefaultListModel) source.getModel();
            //If we are moving items around in the same list, we
            //need to adjust the indices accordingly, since those
            //after the insertion point have moved.
            if (addCount > 0) {
                for (int i = 0; i < indices.length; i++) {
                    if (indices[i] > addIndex) {
                        indices[i] += addCount;
                    }
                }
            }
            for (int i = indices.length - 1; i >= 0; i--) {
                model.remove(indices[i]);
            }
        }
        indices = null;
        addCount = 0;
        addIndex = -1;
    }
}