https://hal.archives-ouvertes.fr/hal-02404862
Tip revision: 759bd8995e51c4e40aa72fd5657d5e6e04c6da89 authored by Software Heritage on 04 February 2020, 13:44:27 UTC
hal: Deposit 405 in collection hal
hal: Deposit 405 in collection hal
Tip revision: 759bd89
ListTransferHandler.java
package extra;
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. 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.
*
* - 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 Sun Microsystems nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* ListTransferHandler.java is used by the DropDemo example.
*/
import javax.swing.*;
import java.awt.datatransfer.*;
public class ListTransferHandler extends TransferHandler {
private static final long serialVersionUID = 1L;
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) {
// Check for String flavor
if (!info.isDataFlavorSupported(DataFlavor.stringFlavor)) {
return false;
}
return true;
}
@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 listModel = (DefaultListModel) list.getModel();
JList.DropLocation dl = (JList.DropLocation) info.getDropLocation();
int index = dl.getIndex();
boolean insert = dl.isInsert();
// Get the string that is being dropped.
Transferable t = info.getTransferable();
String data;
try {
data = (String) t.getTransferData(DataFlavor.stringFlavor);
} catch (Exception e) {
return false;
}
// Perform the actual import.
if (insert) {
listModel.add(index, data);
} else {
listModel.set(index, data);
}
return true;
}
@Override
protected void exportDone(JComponent c, Transferable data, int action) {
cleanup(c, action == TransferHandler.MOVE);
}
// Bundle up the selected items in the list
// as a single string, for export.
protected String exportString(JComponent c) {
JList list = (JList) c;
indices = list.getSelectedIndices();
Object[] values = list.getSelectedValues();
StringBuffer buff = new StringBuffer();
for (int i = 0; i < values.length; i++) {
Object val = values[i];
buff.append(val == null ? "" : val.toString());
if (i != values.length - 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 (int i = 0; i < values.length; i++) {
listModel.add(index++, values[i]);
}
}
// 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;
}
}