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. */ /* * BasicDnD.java requires no other files. */ import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.StringSelection; import java.awt.datatransfer.Transferable; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.DefaultListModel; import javax.swing.DropMode; import javax.swing.JCheckBox; import javax.swing.JColorChooser; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTable; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.JTree; import javax.swing.ListSelectionModel; import javax.swing.SwingUtilities; import javax.swing.TransferHandler; import javax.swing.UIManager; import javax.swing.table.DefaultTableModel; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.DefaultTreeModel; import javax.swing.tree.TreeSelectionModel; public class BasicDnD extends JPanel implements ActionListener { private static JFrame frame; private JTextArea textArea; private JTextField textField; private JList list; private JTable table; private JTree tree; private JColorChooser colorChooser; private JCheckBox toggleDnD; public BasicDnD() { super(new BorderLayout()); JPanel leftPanel = createVerticalBoxPanel(); JPanel rightPanel = createVerticalBoxPanel(); // Create a table model. DefaultTableModel tm = new DefaultTableModel(); tm.addColumn("Column 0"); tm.addColumn("Column 1"); tm.addColumn("Column 2"); tm.addColumn("Column 3"); tm.addRow(new String[] { "Table 00", "Table 01", "Table 02", "Table 03" }); tm.addRow(new String[] { "Table 10", "Table 11", "Table 12", "Table 13" }); tm.addRow(new String[] { "Table 20", "Table 21", "Table 22", "Table 23" }); tm.addRow(new String[] { "Table 30", "Table 31", "Table 32", "Table 33" }); // LEFT COLUMN // Use the table model to create a table. table = new JTable(tm); leftPanel.add(createPanelForComponent(table, "JTable")); // Create a color chooser. colorChooser = new JColorChooser(); leftPanel.add(createPanelForComponent(colorChooser, "JColorChooser")); // RIGHT COLUMN // Create a textfield. textField = new JTextField(30); textField.setText("Favorite foods:\nPizza, Moussaka, Pot roast"); rightPanel.add(createPanelForComponent(textField, "JTextField")); // Create a scrolled text area. textArea = new JTextArea(5, 30); textArea.setText("Favorite shows:\nBuffy, Alias, Angel"); JScrollPane scrollPane = new JScrollPane(textArea); rightPanel.add(createPanelForComponent(scrollPane, "JTextArea")); // Create a list model and a list. DefaultListModel listModel = new DefaultListModel(); listModel.addElement("Martha Washington"); listModel.addElement("Abigail Adams"); listModel.addElement("Martha Randolph"); listModel.addElement("Dolley Madison"); listModel.addElement("Elizabeth Monroe"); listModel.addElement("Louisa Adams"); listModel.addElement("Emily Donelson"); list = new JList(listModel); list.setVisibleRowCount(-1); list.getSelectionModel().setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); list.setTransferHandler(new TransferHandler() { public boolean canImport(TransferHandler.TransferSupport info) { // we only import Strings if (!info.isDataFlavorSupported(DataFlavor.stringFlavor)) { return false; } JList.DropLocation dl = (JList.DropLocation) info.getDropLocation(); if (dl.getIndex() == -1) { return false; } return true; } public boolean importData(TransferHandler.TransferSupport info) { if (!info.isDrop()) { return false; } // Check for String flavor if (!info.isDataFlavorSupported(DataFlavor.stringFlavor)) { displayDropLocation("List doesn't accept a drop of this type."); return false; } JList.DropLocation dl = (JList.DropLocation) info.getDropLocation(); DefaultListModel listModel = (DefaultListModel) list.getModel(); int index = dl.getIndex(); boolean insert = dl.isInsert(); // Get the current string under the drop. String value = (String) listModel.getElementAt(index); // 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; } // Display a dialog with the drop information. String dropValue = "\"" + data + "\" dropped "; if (dl.isInsert()) { if (dl.getIndex() == 0) { displayDropLocation(dropValue + "at beginning of list"); } else if (dl.getIndex() >= list.getModel().getSize()) { displayDropLocation(dropValue + "at end of list"); } else { String value1 = (String) list.getModel().getElementAt(dl.getIndex() - 1); String value2 = (String) list.getModel().getElementAt(dl.getIndex()); displayDropLocation(dropValue + "between \"" + value1 + "\" and \"" + value2 + "\""); } } else { displayDropLocation(dropValue + "on top of " + "\"" + value + "\""); } /** * This is commented out for the basicdemo.html tutorial page. * If you * add this code snippet back and delete the * "return false;" line, the * list will accept drops * of type string. // Perform the actual * import. if (insert) { listModel.add(index, data); } else { * listModel.set(index, data); } return true; */ return false; } public int getSourceActions(JComponent c) { return COPY; } protected Transferable createTransferable(JComponent c) { JList list = (JList) c; 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 new StringSelection(buff.toString()); } }); list.setDropMode(DropMode.ON_OR_INSERT); JScrollPane listView = new JScrollPane(list); listView.setPreferredSize(new Dimension(300, 100)); rightPanel.add(createPanelForComponent(listView, "JList")); // Create a tree. DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("Mia Familia"); DefaultMutableTreeNode sharon = new DefaultMutableTreeNode("Sharon"); rootNode.add(sharon); DefaultMutableTreeNode maya = new DefaultMutableTreeNode("Maya"); sharon.add(maya); DefaultMutableTreeNode anya = new DefaultMutableTreeNode("Anya"); sharon.add(anya); sharon.add(new DefaultMutableTreeNode("Bongo")); maya.add(new DefaultMutableTreeNode("Muffin")); anya.add(new DefaultMutableTreeNode("Winky")); DefaultTreeModel model = new DefaultTreeModel(rootNode); tree = new JTree(model); tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION); JScrollPane treeView = new JScrollPane(tree); treeView.setPreferredSize(new Dimension(300, 100)); rightPanel.add(createPanelForComponent(treeView, "JTree")); // Create the toggle button. toggleDnD = new JCheckBox("Turn on Drag and Drop"); toggleDnD.setActionCommand("toggleDnD"); toggleDnD.addActionListener(this); JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftPanel, rightPanel); splitPane.setOneTouchExpandable(true); add(splitPane, BorderLayout.CENTER); add(toggleDnD, BorderLayout.PAGE_END); setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); } protected JPanel createVerticalBoxPanel() { JPanel p = new JPanel(); p.setLayout(new BoxLayout(p, BoxLayout.PAGE_AXIS)); p.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); return p; } public JPanel createPanelForComponent(JComponent comp, String title) { JPanel panel = new JPanel(new BorderLayout()); panel.add(comp, BorderLayout.CENTER); if (title != null) { panel.setBorder(BorderFactory.createTitledBorder(title)); } return panel; } private void displayDropLocation(final String string) { SwingUtilities.invokeLater(new Runnable() { public void run() { JOptionPane.showMessageDialog(null, string); } }); } public void actionPerformed(ActionEvent e) { if ("toggleDnD".equals(e.getActionCommand())) { boolean toggle = toggleDnD.isSelected(); textArea.setDragEnabled(toggle); textField.setDragEnabled(toggle); list.setDragEnabled(toggle); table.setDragEnabled(toggle); tree.setDragEnabled(toggle); colorChooser.setDragEnabled(toggle); } } /** * 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. frame = new JFrame("BasicDnD"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Create and set up the content pane. JComponent newContentPane = new BasicDnD(); newContentPane.setOpaque(true); // content panes must be opaque frame.setContentPane(newContentPane); // 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(); } }); } }