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. */ /** * ListCutPaste.java requires the following files: * ListTransferHandler.java * TransferActionListener.java */ import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.KeyboardFocusManager; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.StringSelection; import java.awt.datatransfer.Transferable; import java.awt.datatransfer.UnsupportedFlavorException; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.io.IOException; import javax.swing.Action; import javax.swing.ActionMap; import javax.swing.BorderFactory; import javax.swing.DefaultListModel; import javax.swing.DropMode; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.KeyStroke; import javax.swing.ListSelectionModel; import javax.swing.TransferHandler; import javax.swing.UIManager; /** * The ListCutPaste example illustrates cut, copy, paste and drag and drop using * three instances of JList. The TransferActionListener class listens for one of * the CCP actions and, when one occurs, forwards the action to the component * which currently has the focus. */ public class ListCutPaste extends JPanel { ListTransferHandler lh; public ListCutPaste() { super(new BorderLayout()); lh = new ListTransferHandler(); JPanel panel = new JPanel(new GridLayout(1, 3)); DefaultListModel list1Model = new DefaultListModel(); list1Model.addElement("alpha"); list1Model.addElement("beta"); list1Model.addElement("gamma"); list1Model.addElement("delta"); list1Model.addElement("epsilon"); list1Model.addElement("zeta"); JList list1 = new JList(list1Model); list1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); JScrollPane sp1 = new JScrollPane(list1); sp1.setPreferredSize(new Dimension(400, 100)); list1.setDragEnabled(true); list1.setTransferHandler(lh); list1.setDropMode(DropMode.ON_OR_INSERT); setMappings(list1); JPanel pan1 = new JPanel(new BorderLayout()); pan1.add(sp1, BorderLayout.CENTER); pan1.setBorder(BorderFactory.createTitledBorder("Greek Alphabet")); panel.add(pan1); DefaultListModel list2Model = new DefaultListModel(); list2Model.addElement("uma"); list2Model.addElement("dois"); list2Model.addElement("tres"); list2Model.addElement("quatro"); list2Model.addElement("cinco"); list2Model.addElement("seis"); JList list2 = new JList(list2Model); list2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); list2.setDragEnabled(true); JScrollPane sp2 = new JScrollPane(list2); sp2.setPreferredSize(new Dimension(400, 100)); list2.setTransferHandler(lh); list2.setDropMode(DropMode.INSERT); setMappings(list2); JPanel pan2 = new JPanel(new BorderLayout()); pan2.add(sp2, BorderLayout.CENTER); pan2.setBorder(BorderFactory.createTitledBorder("Portuguese Numbers")); panel.add(pan2); DefaultListModel list3Model = new DefaultListModel(); list3Model.addElement("adeen"); list3Model.addElement("dva"); list3Model.addElement("tri"); list3Model.addElement("chyetirye"); list3Model.addElement("pyat"); list3Model.addElement("shest"); JList list3 = new JList(list3Model); list3.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); list3.setDragEnabled(true); JScrollPane sp3 = new JScrollPane(list3); sp3.setPreferredSize(new Dimension(400, 100)); list3.setTransferHandler(lh); list3.setDropMode(DropMode.ON); setMappings(list3); JPanel pan3 = new JPanel(new BorderLayout()); pan3.add(sp3, BorderLayout.CENTER); pan3.setBorder(BorderFactory.createTitledBorder("Russian Numbers")); panel.add(pan3); setPreferredSize(new Dimension(500, 200)); add(panel, 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); TransferActionListener actionListener = new TransferActionListener(); menuItem = new JMenuItem("Cut"); menuItem.setActionCommand((String) TransferHandler.getCutAction().getValue(Action.NAME)); menuItem.addActionListener(actionListener); menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.CTRL_MASK)); menuItem.setMnemonic(KeyEvent.VK_T); mainMenu.add(menuItem); menuItem = new JMenuItem("Copy"); menuItem.setActionCommand((String) TransferHandler.getCopyAction().getValue(Action.NAME)); menuItem.addActionListener(actionListener); menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.CTRL_MASK)); menuItem.setMnemonic(KeyEvent.VK_C); mainMenu.add(menuItem); menuItem = new JMenuItem("Paste"); menuItem.setActionCommand((String) TransferHandler.getPasteAction().getValue(Action.NAME)); menuItem.addActionListener(actionListener); menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, ActionEvent.CTRL_MASK)); menuItem.setMnemonic(KeyEvent.VK_P); mainMenu.add(menuItem); menuBar.add(mainMenu); return menuBar; } /** * Add the cut/copy/paste actions to the action map. */ private void setMappings(JList list) { ActionMap map = list.getActionMap(); map.put(TransferHandler.getCutAction().getValue(Action.NAME), TransferHandler.getCutAction()); map.put(TransferHandler.getCopyAction().getValue(Action.NAME), TransferHandler.getCopyAction()); map.put(TransferHandler.getPasteAction().getValue(Action.NAME), TransferHandler.getPasteAction()); } /** * 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("ListCutPaste"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Create and set up the menu bar and content pane. ListCutPaste demo = new ListCutPaste(); 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. */ /* * ListTransferHandler.java is used by the ListCutPaste example. */ class ListTransferHandler extends TransferHandler { /** * Perform the actual data import. */ public boolean importData(TransferHandler.TransferSupport info) { String data = null; // If we can't handle the import, bail now. if (!canImport(info)) { return false; } JList list = (JList) info.getComponent(); DefaultListModel model = (DefaultListModel) list.getModel(); // Fetch the data -- bail if this fails try { data = (String) info.getTransferable().getTransferData(DataFlavor.stringFlavor); } catch (UnsupportedFlavorException ufe) { System.out.println("importData: unsupported data flavor"); return false; } catch (IOException ioe) { System.out.println("importData: I/O exception"); return false; } if (info.isDrop()) { // This is a drop JList.DropLocation dl = (JList.DropLocation) info.getDropLocation(); int index = dl.getIndex(); if (dl.isInsert()) { model.add(index, data); return true; } else { model.set(index, data); return true; } } else { // This is a paste int index = list.getSelectedIndex(); // if there is a valid selection, // insert data after the selection if (index >= 0) { model.add(list.getSelectedIndex() + 1, data); // else append to the end of the list } else { model.addElement(data); } return true; } } /** * Bundle up the data for export. */ protected Transferable createTransferable(JComponent c) { JList list = (JList) c; int index = list.getSelectedIndex(); String value = (String) list.getSelectedValue(); return new StringSelection(value); } /** * The list handles both copy and move actions. */ public int getSourceActions(JComponent c) { return COPY_OR_MOVE; } /** * When the export is complete, remove the old list entry if the action was a * move. */ protected void exportDone(JComponent c, Transferable data, int action) { if (action != MOVE) { return; } JList list = (JList) c; DefaultListModel model = (DefaultListModel) list.getModel(); int index = list.getSelectedIndex(); model.remove(index); } /** * We only support importing strings. */ public boolean canImport(TransferHandler.TransferSupport support) { // we only import Strings if (!support.isDataFlavorSupported(DataFlavor.stringFlavor)) { return false; } return true; } } /* * 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. */ /* * TransferActionListener.java is used by the ListCutPaste example. */ /** * A class that tracks the focused component. This is necessary to delegate the * menu cut/copy/paste commands to the right component. An instance of this * class is listening and when the user fires one of these commands, it calls * the appropriate action on the currently focused component. */ class TransferActionListener implements ActionListener, PropertyChangeListener { private JComponent focusOwner = null; public TransferActionListener() { KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager(); manager.addPropertyChangeListener("permanentFocusOwner", this); } public void propertyChange(PropertyChangeEvent e) { Object o = e.getNewValue(); if (o instanceof JComponent) { focusOwner = (JComponent) o; } else { focusOwner = null; } } public void actionPerformed(ActionEvent e) { if (focusOwner == null) return; String action = (String) e.getActionCommand(); Action a = focusOwner.getActionMap().get(action); if (a != null) { a.actionPerformed(new ActionEvent(focusOwner, ActionEvent.ACTION_PERFORMED, null)); } } }