positionmanager.java

用JGraph编的软件

/*
 * @(#)PositionManager.java 1.0 05.08.2003
 *
 * Copyright (C) 2003 sven_luzar
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */
package org.jgraph.utils.gui;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Rectangle;
import java.awt.Window;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Vector;
import java.util.prefs.Preferences;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;

/**
 * 
 * 
 * @author sven_luzar
 * @version 1.0
 * 
 */
public class PositionManager {

	/** Key suffix for the Registry to save and load
	 *  the frame width for the component
	 */
	protected static final String FRAME_WIDTH = ".FrameWidth";

	/** Key suffix for the Registry to save and load
	 *  the frame height for the component
	 */
	protected static final String FRAME_HEIGHT = ".FrameHeight";

	/** Key suffix for the Registry to save and load
	 *  the frame state for the component
	 */
	protected static final String FRAME_STATE = ".FrameState";

	/** Key suffix for the Registry to save and load
	 *  the frame x position for the component
	 */
	protected static final String FRAME_X = ".FrameX";

	/** Key suffix for the Registry to save and load
	 *  the frame y position for the component
	 */
	protected static final String FRAME_Y = ".FrameY";

	/** Key suffix for the Registry to save and load
	 *  the dividerlocation for the JSplitPane
	 * 
	 */
	protected static final String DIVIDER_LOCATION = ".DividerLocation";

	/** vector with all registered containers
	 * 
	 */
	protected static Vector containers = new Vector();

	/** we only need one adapter for all components
	 * 
	 */
	protected static PosComponentListener posComponentListener =
		new PosComponentListener();

	/** We only need one listener for all split panes.
	 *  The listener reacts at each movement
	 *  and stores the new position.
	 * 
	 */
	protected static PosPropertyChangeListener posPropertyChangeListener =
		new PosPropertyChangeListener();

	/** Adds a component to the control of the position manager.
	 * 
	 *  <b>Note:</b> 
	 *  Register the Container before opening a window! 
	 *  For example:
	 * 
	 *  <pre>
	 * 	JFrame f = new JFrame();
	 *  PositionManager.addContainer(f);
	 *  f.setVisible(true);
	 *  </pre>
	 * 
	 *  Adds the needed listeners 
	 *  at the component.
	 *  Before the addition the method
	 *  reads the old position values
	 *  and sets them to the component.
	 * 
	 *  If the method can't find old values then
	 *  the method will try to get the screen size
	 *  and will set 2/3 % from the screen size
	 *  to the frame. If there is no availabe
	 *  screen size the method uses the 
	 *  400 x 600 dimensions.
	 * 
	 *  Currently we a support for the following components 
	 *  <ul>
	 *  <li>{@link java.awt.Window}</li>
	 *  <li>{@link javax.swing.JInternalFrame}</li>
	 *  <li>{@link javax.swing.JSplitPane}</li>
	 *  </ul>
	 * 
	 * @param oComp the concerning container
	 *  
	 */
	public static void addComponent(Component comp) {
		if (comp == null)
			return;

		if (comp instanceof JSplitPane) {
			JSplitPane jsp = (JSplitPane) comp;
			// set the old positions to the internal frame
			updateComponent(comp);

			// register the listener to store
			// the positions for the future
			jsp.addPropertyChangeListener(
				JSplitPane.DIVIDER_LOCATION_PROPERTY,
				posPropertyChangeListener);

		} else

			// do not set the position for all components
			// use only windows
			if (comp instanceof JInternalFrame || comp instanceof Window) {
				// set the old positions to the internal frame
				updateComponent(comp);

				// register the listener to store
				// the positions for the future
				comp.addComponentListener(posComponentListener);

			} else
				throw new IllegalArgumentException(
					"We have no position storage implementation for "
						+ comp.getClass());

	}

	/**
	 *  The method reads the old position values
	 *  and sets them to the component.
	 * 
	 *  If the method can't find old values then
	 *  the method will try to get the screen size
	 *  and will set 2/3 % from the screen size
	 *  to the frame. If there is no availabe
	 *  screen size the method uses the 
	 *  400 x 600 dimensions.
	 * 
	 *  Currently we a support for the following components 
	 *  <ul>
	 *  <li>{@link java.awt.Window}</li>
	 *  <li>{@link javax.swing.JInternalFrame}</li>
	 *  <li>{@link javax.swing.JSplitPane}</li>
	 *  </ul>
	 * 
	 * @param comp the concerning container
	 */	
	public static void updateComponent(Component comp){
		if (comp == null)
			return;

		if (comp instanceof JSplitPane) {
			JSplitPane jsp = (JSplitPane) comp;
			// set the old positions to the internal frame
			int pos =
				PositionManager.getIntPos(
					jsp,
					PositionManager.DIVIDER_LOCATION,
					-1);
			
			if (pos == -1)
				jsp.setDividerLocation(100);
			else 
				jsp.setDividerLocation(pos);

		} else

			// do not set the position for all components
			// use only windows
			if (comp instanceof JInternalFrame || comp instanceof Window) {
				// set the old positions to the internal frame
				int x =
					PositionManager.getIntPos(
						comp,
						PositionManager.FRAME_X,
						-1);
				int y =
					PositionManager.getIntPos(
						comp,
						PositionManager.FRAME_Y,
						-1);
				int width =
					PositionManager.getIntPos(
						comp,
						PositionManager.FRAME_WIDTH,
						-1);
				int height =
					PositionManager.getIntPos(
						comp,
						PositionManager.FRAME_HEIGHT,
						-1);
				if (x == -1 || y == -1 || width == -1 || height == -1) {

					Dimension d;
					if (comp instanceof JInternalFrame) {
						JInternalFrame jif = (JInternalFrame) comp;
						Container cont = jif.getParent();
						if (cont == null
							|| (cont.getSize().width == 0
								&& cont.getSize().height == 0)) {
							// use the dimension if no more information is available 
							d = new Dimension(600, 400);
						} else {
							// will use the desktop pane size
							// if available
							d = cont.getSize();
						}
					} else {
						// use the scree size by default
						d = comp.getToolkit().getScreenSize();
					}

					int h = d.height;
					int w = d.width;
					height = (int) ((double) h * 0.66);
					width = (int) ((double) w * 0.66);
					x = (int) ((double) (h - height) / 2);
					y = (int) ((double) (w - width) / 2);
				}
				
				Rectangle r = new Rectangle(x, y, width, height);
				comp.setBounds(r);
				
				if (comp instanceof JComponent){
					((JComponent)comp).setPreferredSize(new Dimension(width, height));
					((JComponent)comp).setSize(new Dimension(width, height));
				}

			} else
				throw new IllegalArgumentException(
					"We have no position storage implementation for "
						+ comp.getClass());

	}

	/** Removes a component from the control of the position manager.
		*  The method removes the unused listeners 
		*  from the component.
		* 
		*/
	public static void removeComponent(Component comp) {
		if (comp == null)
			return;

		if (comp instanceof JSplitPane) {
			JSplitPane jsp = (JSplitPane) comp;
			jsp.removePropertyChangeListener(