Java tutorial
/* * 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; } }