Java examples for Swing:JList
Add Drag and drop support for list control
/*/*from ww w.ja v a 2s . c o m*/ * BasicDnD.java requires no other files. */ import java.util.*; import java.awt.*; import java.awt.event.*; import java.text.*; import java.awt.datatransfer.*; import javax.swing.*; import javax.swing.text.*; import javax.swing.tree.*; import javax.swing.table.*; 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(); } }); } } /* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. 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