Mega Code Archive
Choose Drop Action
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/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved.
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* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
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* 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,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.DefaultListModel;
import javax.swing.DropMode;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.TransferHandler;
import javax.swing.UIManager;
public class ChooseDropActionDemo extends JFrame {
DefaultListModel from = new DefaultListModel();
DefaultListModel copy = new DefaultListModel();
DefaultListModel move = new DefaultListModel();
JList dragFrom;
public ChooseDropActionDemo() {
super("ChooseDropActionDemo");
for (int i = 15; i >= 0; i--) {
from.add(0, "Source item " + i);
}
for (int i = 2; i >= 0; i--) {
copy.add(0, "Target item " + i);
move.add(0, "Target item " + i);
}
JPanel p = new JPanel();
p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
dragFrom = new JList(from);
dragFrom.setTransferHandler(new FromTransferHandler());
dragFrom.setPrototypeCellValue("List Item WWWWWW");
dragFrom.setDragEnabled(true);
dragFrom.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
JLabel label = new JLabel("Drag from here:");
label.setAlignmentX(0f);
p.add(label);
JScrollPane sp = new JScrollPane(dragFrom);
sp.setAlignmentX(0f);
p.add(sp);
add(p, BorderLayout.WEST);
JList moveTo = new JList(move);
moveTo.setTransferHandler(new ToTransferHandler(TransferHandler.COPY));
moveTo.setDropMode(DropMode.INSERT);
JList copyTo = new JList(copy);
copyTo.setTransferHandler(new ToTransferHandler(TransferHandler.MOVE));
copyTo.setDropMode(DropMode.INSERT);
p = new JPanel();
p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));
label = new JLabel("Drop to COPY to here:");
;
label.setAlignmentX(0f);
p.add(label);
sp = new JScrollPane(moveTo);
sp.setAlignmentX(0f);
p.add(sp);
label = new JLabel("Drop to MOVE to here:");
label.setAlignmentX(0f);
p.add(label);
sp = new JScrollPane(copyTo);
sp.setAlignmentX(0f);
p.add(sp);
p.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 0));
add(p, BorderLayout.CENTER);
((JPanel) getContentPane()).setBorder(BorderFactory.createEmptyBorder(2, 2,
2, 2));
getContentPane().setPreferredSize(new Dimension(320, 315));
}
private static void createAndShowGUI() {
// Create and set up the window.
ChooseDropActionDemo test = new ChooseDropActionDemo();
test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Display the window.
test.pack();
test.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
// Turn off metal's use of bold fonts
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}
});
}
class FromTransferHandler extends TransferHandler {
public int getSourceActions(JComponent comp) {
return COPY_OR_MOVE;
}
private int index = 0;
public Transferable createTransferable(JComponent comp) {
index = dragFrom.getSelectedIndex();
if (index < 0 || index >= from.getSize()) {
return null;
}
return new StringSelection((String) dragFrom.getSelectedValue());
}
public void exportDone(JComponent comp, Transferable trans, int action) {
if (action != MOVE) {
return;
}
from.removeElementAt(index);
}
}
class ToTransferHandler extends TransferHandler {
int action;
public ToTransferHandler(int action) {
this.action = action;
}
public boolean canImport(TransferHandler.TransferSupport support) {
// for the demo, we'll only support drops (not clipboard paste)
if (!support.isDrop()) {
return false;
}
// we only import Strings
if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) {
return false;
}
boolean actionSupported = (action & support.getSourceDropActions()) == action;
if (actionSupported) {
support.setDropAction(action);
return true;
}
return false;
}
public boolean importData(TransferHandler.TransferSupport support) {
// if we can't handle the import, say so
if (!canImport(support)) {
return false;
}
// fetch the drop location
JList.DropLocation dl = (JList.DropLocation) support.getDropLocation();
int index = dl.getIndex();
// fetch the data and bail if this fails
String data;
try {
data = (String) support.getTransferable().getTransferData(
DataFlavor.stringFlavor);
} catch (UnsupportedFlavorException e) {
return false;
} catch (java.io.IOException e) {
return false;
}
JList list = (JList) support.getComponent();
DefaultListModel model = (DefaultListModel) list.getModel();
model.insertElementAt(data, index);
Rectangle rect = list.getCellBounds(index, index);
list.scrollRectToVisible(rect);
list.setSelectedIndex(index);
list.requestFocusInWindow();
return true;
}
}
}
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