Mega Code Archive
Text component supports both cut, copy and paste (using the DefaultEditorKits built-in actions) and drag and drop
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/*
* 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.
*/
/**
* TextCutPaste.java requires the following file:
* TextTransferHandler.java
*/
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.KeyEvent;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.TransferHandler;
import javax.swing.UIManager;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultEditorKit;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;
import javax.swing.text.Position;
/**
* Example code that shows a text component that supports both cut, copy and
* paste (using the DefaultEditorKit's built-in actions) and drag and drop.
*/
public class TextCutPaste extends JPanel {
TextTransferHandler th;
public TextCutPaste() {
super(new BorderLayout());
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
// Create the transfer handler.
TextTransferHandler th = new TextTransferHandler();
// Create some text fields.
JPanel buttonPanel = new JPanel(new GridLayout(3, 1));
JTextField textField = new JTextField("Cut, copy and paste...", 30);
textField.setTransferHandler(th);
textField.setDragEnabled(true);
buttonPanel.add(textField);
textField = new JTextField("or drag and drop...", 30);
textField.setTransferHandler(th);
textField.setDragEnabled(true);
buttonPanel.add(textField);
textField = new JTextField("from any of these text fields.", 30);
textField.setTransferHandler(th);
textField.setDragEnabled(true);
buttonPanel.add(textField);
add(buttonPanel, BorderLayout.CENTER);
}
/**
* Create an Edit menu to support cut/copy/paste.
*/
public JMenuBar createMenuBar() {
JMenuItem menuItem = null;
JMenuBar menuBar = new JMenuBar();
JMenu mainMenu = new JMenu("Edit");
mainMenu.setMnemonic(KeyEvent.VK_E);
menuItem = new JMenuItem(new DefaultEditorKit.CutAction());
menuItem.setText("Cut");
menuItem.setMnemonic(KeyEvent.VK_T);
mainMenu.add(menuItem);
menuItem = new JMenuItem(new DefaultEditorKit.CopyAction());
menuItem.setText("Copy");
menuItem.setMnemonic(KeyEvent.VK_C);
mainMenu.add(menuItem);
menuItem = new JMenuItem(new DefaultEditorKit.PasteAction());
menuItem.setText("Paste");
menuItem.setMnemonic(KeyEvent.VK_P);
mainMenu.add(menuItem);
menuBar.add(mainMenu);
return menuBar;
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("TextCutPaste");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the menu bar and content pane.
TextCutPaste demo = new TextCutPaste();
frame.setJMenuBar(demo.createMenuBar());
demo.setOpaque(true); // content panes must be opaque
frame.setContentPane(demo);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event-dispatching thread:
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
// Turn off metal's use of bold fonts
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}
});
}
}
/*
* 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.
*/
/**
* TextTransferHandler.java is used by the TextCutPaste.java example.
*/
/**
* An implementation of TransferHandler that adds support for the import and
* export of text using drag and drop and cut/copy/paste.
*/
class TextTransferHandler extends TransferHandler {
// Start and end position in the source text.
// We need this information when performing a MOVE
// in order to remove the dragged text from the source.
Position p0 = null, p1 = null;
/**
* Perform the actual import. This method supports both drag and drop and
* cut/copy/paste.
*/
public boolean importData(TransferHandler.TransferSupport support) {
// If we can't handle the import, bail now.
if (!canImport(support)) {
return false;
}
// Fetch the data -- 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;
}
JTextField tc = (JTextField) support.getComponent();
tc.replaceSelection(data);
return true;
}
/**
* Bundle up the data for export.
*/
protected Transferable createTransferable(JComponent c) {
JTextField source = (JTextField) c;
int start = source.getSelectionStart();
int end = source.getSelectionEnd();
Document doc = source.getDocument();
if (start == end) {
return null;
}
try {
p0 = doc.createPosition(start);
p1 = doc.createPosition(end);
} catch (BadLocationException e) {
System.out
.println("Can't create position - unable to remove text from source.");
}
String data = source.getSelectedText();
return new StringSelection(data);
}
/**
* These text fields handle both copy and move actions.
*/
public int getSourceActions(JComponent c) {
return COPY_OR_MOVE;
}
/**
* When the export is complete, remove the old text if the action was a move.
*/
protected void exportDone(JComponent c, Transferable data, int action) {
if (action != MOVE) {
return;
}
if ((p0 != null) && (p1 != null) && (p0.getOffset() != p1.getOffset())) {
try {
JTextComponent tc = (JTextComponent) c;
tc.getDocument()
.remove(p0.getOffset(), p1.getOffset() - p0.getOffset());
} catch (BadLocationException e) {
System.out.println("Can't remove text from source.");
}
}
}
/**
* We only support importing strings.
*/
public boolean canImport(TransferHandler.TransferSupport support) {
// we only import Strings
if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) {
return false;
}
return true;
}
}
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