treetableexample2.java

一个结java树和表格的控件

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat;

public class TreeTableExample2 {
	/** Number of instances of TreeTableExample2. */
	protected static int ttCount;

	/** Model for the JTreeTable. */
	protected FileSystemModel2 model;

	/** Used to represent the model. */
	protected JTreeTable treeTable;

	/** Row the is being reloaded. */
	protected int reloadRow;

	/** TreePath being reloaded. */
	protected TreePath reloadPath;

	/**
	 * A counter increment as the Timer fies and the same path is being
	 * reloaded.
	 */
	protected int reloadCounter;

	/** Timer used to update reload state. */
	protected Timer timer;

	/** Used to indicate status. */
	protected JLabel statusLabel;

	/** Frame containing everything. */
	protected JFrame frame;

	/** Path created with. */
	protected String path;

	public TreeTableExample2(String path) {
		this.path = path;
		ttCount++;

		frame = createFrame();

		Container cPane = frame.getContentPane();
		JMenuBar mb = createMenuBar();

		model = createModel(path);
		treeTable = createTreeTable();
		statusLabel = createStatusLabel();
		cPane.add(new JScrollPane(treeTable));
		cPane.add(statusLabel, BorderLayout.SOUTH);

		reloadRow = -1;
		frame.setJMenuBar(mb);
		frame.pack();
		frame.setVisible(true);
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				reload(model.getRoot());
			}
		});
	}

	/**
	 * Creates and return a JLabel that is used to indicate the status of
	 * loading.
	 */
	protected JLabel createStatusLabel() {
		JLabel retLabel = new JLabel(" ");

		retLabel.setHorizontalAlignment(JLabel.RIGHT);
		retLabel.setBorder(new BevelBorder(BevelBorder.LOWERED));
		return retLabel;
	}

	/**
	 * Creates and returns the instanceof JTreeTable that will be used. This
	 * also creates, but does not start, the Timer that is used to update the
	 * display as files are loaded.
	 */
	protected JTreeTable createTreeTable() {
		JTreeTable treeTable = new JTreeTable(model);

		treeTable.getColumnModel().getColumn(1).setCellRenderer(
				new IndicatorRenderer());

		Reloader rl = new Reloader();

		timer = new Timer(700, rl);
		timer.setRepeats(true);
		treeTable.getTree().addTreeExpansionListener(rl);
		return treeTable;
	}

	/**
	 * Creates the FileSystemModel2 that will be used.
	 */
	protected FileSystemModel2 createModel(String path) {
		return new FileSystemModel2(path);
	}

	/**
	 * Creates the JFrame that will contain everything.
	 */
	protected JFrame createFrame() {
		JFrame retFrame = new JFrame("TreeTable II");

		retFrame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent we) {
				if (--ttCount == 0) {
					System.exit(0);
				}
			}
		});
		return retFrame;
	}

	/**
	 * Creates a menu bar.
	 */
	protected JMenuBar createMenuBar() {
		JMenu fileMenu = new JMenu("File");
		JMenuItem menuItem;

		menuItem = new JMenuItem("Open");
		menuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				JFileChooser fc = new JFileChooser(path);

				fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

				int result = fc.showOpenDialog(frame);

				if (result == JFileChooser.APPROVE_OPTION) {
					String newPath = fc.getSelectedFile().getPath();

					new TreeTableExample2(newPath);
				}
			}
		});
		fileMenu.add(menuItem);
		fileMenu.addSeparator();

		menuItem = new JMenuItem("Reload");
		menuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				TreePath path = treeTable.getTree().getSelectionPath();

				if (path != null) {
					model.stopLoading();
					reload(path.getLastPathComponent());
				}
			}
		});
		fileMenu.add(menuItem);

		menuItem = new JMenuItem("Stop");
		menuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				model.stopLoading();
			}
		});
		fileMenu.add(menuItem);

		fileMenu.addSeparator();

		menuItem = new JMenuItem("Exit");
		menuItem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				System.exit(0);
			}
		});
		fileMenu.add(menuItem);

		// Create a menu bar
		JMenuBar menuBar = new JMenuBar();

		menuBar.add(fileMenu);

		// Menu for the look and feels (lafs).
		UIManager.LookAndFeelInfo[] lafs = UIManager.getInstalledLookAndFeels();
		ButtonGroup lafGroup = new ButtonGroup();

		JMenu optionsMenu = new JMenu("Options");

		menuBar.add(optionsMenu);

		for (int i = 0; i < lafs.length; i++) {
			JRadioButtonMenuItem rb = new JRadioButtonMenuItem(lafs[i]
					.getName());
			optionsMenu.add(rb);
			rb.setSelected(UIManager.getLookAndFeel().getName().equals(
					lafs[i].getName()));
			rb.putClientProperty("UIKey", lafs[i]);
			rb.addItemListener(new ItemListener() {
				public void itemStateChanged(ItemEvent ae) {
					JRadioButtonMenuItem rb2 = (JRadioButtonMenuItem) ae
							.getSource();
					if (rb2.isSelected()) {
						UIManager.LookAndFeelInfo info = (UIManager.LookAndFeelInfo) rb2
								.getClientProperty("UIKey");
						try {
							UIManager.setLookAndFeel(info.getClassName());
							SwingUtilities.updateComponentTreeUI(frame);
						} catch (Exception e) {
							System.err.println("unable to set UI "
									+ e.getMessage());
						}
					}
				}
			});
			lafGroup.add(rb);
		}
		return menuBar;
	}

	/**
	 * Invoked to reload the children of a particular node. This will also
	 * restart the timer.
	 */
	protected void reload(Object node) {
		model.reloadChildren(node);
		if (!timer.isRunning()) {
			timer.start();
		}
	}

	/**
	 * Updates the status label based on reloadRow.
	 */
	protected void updateStatusLabel() {
		if (reloadPath != null) {
			statusLabel.setText("Reloading: "
					+ model.getPath(reloadPath.getLastPathComponent()));
			if ((reloadCounter % 4) < 2) {
				statusLabel.setForeground(Color.red);
			} else {
				statusLabel.setForeground(Color.blue);
			}
		} else if (!model.isReloading()) {
			statusLabel.setText("Total Size: "
					+ NumberFormat.getInstance().format(
							model.getTotalSize(model.getRoot())));
			statusLabel.setForeground(Color.black);
		}
	}

	/**
	 * Reloader is the ActionListener used in the Timer. In response to the
	 * timer updating it will reset the reloadRow/reloadPath and generate the
	 * necessary event so that the display will update. It also implements the
	 * TreeExpansionListener so that if the tree is altered while loading the
	 * reloadRow is updated accordingly.
	 */
	class Reloader implements ActionListener, TreeExpansionListener {
		public void actionPerformed(ActionEvent ae) {
			if (!model.isReloading()) {
				// No longer loading.
				timer.stop();
				if (reloadRow != -1) {
					generateChangeEvent(reloadRow);
				}
				reloadRow = -1;
				reloadPath = null;
			} else {
				// Still loading, see if paths changed.
				TreePath newPath = model.getPathLoading();

				if (newPath == null) {
					// Hmm... Will usually indicate the reload thread
					// completed between time we asked if reloading.
					if (reloadRow != -1) {
						generateChangeEvent(reloadRow);
					}
					reloadRow = -1;
					reloadPath = null;
				} else {
					// Ok, valid path, see if matches last path.
					int newRow = treeTable.getTree().getRowForPath(newPath);

					if (newPath.equals(reloadPath)) {
						reloadCounter = (reloadCounter + 1) % 8;
						if (newRow != reloadRow) {
							int lastRow = reloadRow;

							reloadRow = newRow;
							generateChangeEvent(lastRow);
						}
						generateChangeEvent(reloadRow);
					} else {
						int lastRow = reloadRow;

						reloadCounter = 0;
						reloadRow = newRow;
						reloadPath = newPath;
						if (lastRow != reloadRow) {
							generateChangeEvent(lastRow);
						}
						generateChangeEvent(reloadRow);
					}
				}
			}
			updateStatusLabel();
		}

		/**
		 * Generates and update event for the specified row. FileSystemModel2
		 * could do this, but it would not know when the row has changed as a
		 * result of expanding/collapsing nodes in the tree.
		 */
		protected void generateChangeEvent(int row) {
			if (row != -1) {
				AbstractTableModel tModel = (AbstractTableModel) treeTable
						.getModel();

				tModel
						.fireTableChanged(new TableModelEvent(tModel, row, row,
								1));
			}
		}

		//
		// TreeExpansionListener
		//

		/**
		 * Invoked when the tree has expanded.
		 */
		public void treeExpanded(TreeExpansionEvent te) {
			updateRow();
		}

		/**
		 * Invoked when the tree has collapsed.
		 */
		public void treeCollapsed(TreeExpansionEvent te) {
			updateRow();
		}

		/**
		 * Updates the reloadRow and path, this does not genernate a change
		 * event.
		 */
		protected void updateRow() {
			reloadPath = model.getPathLoading();

			if (reloadPath != null) {
				reloadRow = treeTable.getTree().getRowForPath(reloadPath);
			}
		}
	}

	/**
	 * A renderer that will give an indicator when a cell is being reloaded.
	 */
	class IndicatorRenderer extends DefaultTableCellRenderer {
		/**
		 * Makes sure the number of displayed in an internationalized manner.
		 */
		protected NumberFormat formatter;

		/** Row that is currently being painted. */
		protected int lastRow;

		IndicatorRenderer() {
			setHorizontalAlignment(JLabel.RIGHT);
			formatter = NumberFormat.getInstance();
		}

		/**
		 * Invoked as part of DefaultTableCellRenderers implemention. Sets the
		 * text of the label.
		 */
		public void setValue(Object value) {
			setText((value == null) ? "---" : formatter.format(value));
		}

		/**
		 * Returns this.
		 */
		public Component getTableCellRendererComponent(JTable table,
				Object value, boolean isSelected, boolean hasFocus, int row,
				int column) {
			super.getTableCellRendererComponent(table, value, isSelected,
					hasFocus, row, column);
			lastRow = row;
			return this;
		}

		/**
		 * If the row being painted is also being reloaded this will draw a
		 * little indicator.
		 */
		public void paint(Graphics g) {
			if (lastRow == reloadRow) {
				int width = getWidth();
				int height = getHeight();

				g.setColor(getBackground());
				g.fillRect(0, 0, width, height);
				g.setColor(getForeground());

				int diameter = Math.min(width, height);

				if (reloadCounter < 5) {
					g.fillArc((width - diameter) / 2, (height - diameter) / 2,
							diameter, diameter, 90, -(reloadCounter * 90));
				} else {
					g.fillArc((width - diameter) / 2, (height - diameter) / 2,
							diameter, diameter, 90,
							(4 - reloadCounter % 4) * 90);
				}
			} else {
				super.paint(g);
			}
		}
	}

	public static void main(String[] args) {
		if (args.length > 0) {
			for (int counter = args.length - 1; counter >= 0; counter--) {
				new TreeTableExample2(args[counter]);
			}
		} else {
			String path;

			try {
				path = System.getProperty("user.home");
				if (path != null) {
					new TreeTableExample2(path);
				}
			} catch (SecurityException se) {
				path = null;
			}
			if (path == null) {
				System.out.println("Could not determine home directory");
			}
		}
	}
}