//package com.javaweb.util;

import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.FileFilter;


/**
 * @author Administrator
 * 
 */
public class WebBrowser extends JFrame implements HyperlinkListener,
		PropertyChangeListener {

	/**
	 * 
	 */
	// 添加swing組件
	JEditorPane textPane;

	JLabel messageLine;

	JTextField urlField;

	JFileChooser fileChooser;

	JButton backButton;

	JButton forwardButton;

	//
	java.util.List history = new ArrayList();

	int currentHistoryPage = -1;

	public static final int MAX_HISTORY = 50;

	static int numBrowserWindows = 0;

	static boolean exitWhenLastWindowClosed = false;

	String home = "http://www.baidu.com";

	// gouzaohanshu
	public WebBrowser() {
		super("WebBrowser");

		textPane = new JEditorPane();
		textPane.setEditable(false);
		textPane.addPropertyChangeListener(this);
		textPane.addHyperlinkListener(this);
		this.getContentPane().add(new JScrollPane(textPane),
				BorderLayout.CENTER);
		messageLine = new JLabel("  ");
		this.getContentPane().add(messageLine, BorderLayout.SOUTH);
		this.initMenu();
		this.initToolbar();
		WebBrowser.numBrowserWindows++;
		this.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				// close();
			}

		});

	}

	private void initToolbar() {
		// TODO Auto-generated method stub
		backButton = new JButton("后退");
		backButton.setEnabled(false);
		backButton.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				back();

			}

		});
		forwardButton = new JButton("前進");
		forwardButton.setEnabled(false);
		forwardButton.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				forward();

			}

			private void forward() {
				// TODO Auto-generated method stub
				if (currentHistoryPage < history.size() - 1) {
					visit((URL) history.get(++currentHistoryPage));

				}
				backButton.setEnabled((currentHistoryPage > 0));
				forwardButton
						.setEnabled((currentHistoryPage < history.size() - 1));

			}

		});
		JButton refreshButton = new JButton("刷新");

		refreshButton.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				reload();

			}

			private void reload() {
				// TODO Auto-generated method stub

				// TODO Auto-generated method
				textPane.setDocument(new javax.swing.text.html.HTMLDocument());
				visit((URL) history.get(currentHistoryPage));

			}

		});
		JButton homeButton = new JButton("主頁");

		homeButton.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				home();

			}

			public void home() {
				// TODO Auto-generated method stub
				displayPage(getHome());

			}

		});
		urlField = new JTextField();
		urlField.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				displayPage(urlField.getText());

			}

		});

		JToolBar toolbar = new JToolBar();
		toolbar.setEnabled(false);
		toolbar.add(backButton);
		toolbar.add(forwardButton);
		toolbar.add(refreshButton);
		toolbar.add(homeButton);
		toolbar.add(new JLabel("              地址："));
		toolbar.add(urlField);
		this.getContentPane().add(toolbar, BorderLayout.NORTH);

	}

	protected String getHome() {
		// TODO Auto-generated method stub
		return home;
	}

	protected void back() {
		// TODO Auto-generated method stub
		if (currentHistoryPage > 0) {
			visit((URL) history.get(--currentHistoryPage));
		}
		backButton.setEnabled((currentHistoryPage > 0));
		forwardButton.setEnabled((currentHistoryPage < history.size() - 1));

	}

	public static void setExitWhenLastWindowClosed(boolean b) {
		exitWhenLastWindowClosed = b;
	}

	public void setHome() {
		this.home = home;
	}

	public String getHone() {
		return home;
	}

	private boolean visit(URL url) {
		try {
			String herf = url.toString();
			startAnimation("加載" + herf + "...");
			textPane.setPage(url);
			this.setTitle(herf);
			urlField.setText(herf);
			return true;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			stopAnimation();
			messageLine.setText("不能打開頁面" + e.getMessage());
			return false;
		}

	}

	public void displayPage(URL url) {
		if (visit(url)) {
			history.add(url);
			int numentries = history.size();
			if (numentries > MAX_HISTORY + 10) {
				history = history.subList(numentries - MAX_HISTORY, numentries);
				numentries = MAX_HISTORY;
			}
			currentHistoryPage = numentries - 1;
			if (currentHistoryPage > 0) {
				backButton.setEnabled(true);
			}

		}
	}

	public void displayPage(String href) {
		try {
			if (!href.startsWith("http://")) {
				href = "http://" + href;

			}
			displayPage(new URL(href));
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			messageLine.setText("錯誤網址：" + href);
		}

	}

	public void openLocalPage() {
		if (fileChooser == null) {
			fileChooser = new JFileChooser();
			FileFilter filter = new FileFilter() {
				public boolean accept(File f) {
					String fn = f.getName();
					if (fn.endsWith(".html") || fn.endsWith(".htm")) {
						return true;
					} else {
						return false;

					}

				}

				public String getDescription() {
					return "HTML Files";
				}

			};
			fileChooser.addChoosableFileFilter((FileFilter) filter);
		}
		int result = fileChooser.showOpenDialog(this);
		if (result == JFileChooser.APPROVE_OPTION) {
			File selectedFile = fileChooser.getSelectedFile();
			try {
				displayPage(selectedFile.toURL());
			} catch (MalformedURLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	private void stopAnimation() {
		// TODO Auto-generated method stub

	}

	String animationMessage;

	int animationFrame = 0;

	private void startAnimation(String msg) {
		// TODO Auto-generated method stub
		animationMessage = msg;
		animationFrame = 0;

	}

	private void initMenu() {
		// TODO Auto-generated method stub
		JMenu fileMenu = new JMenu("文件");
		fileMenu.setMnemonic('F');
		JMenuItem newMenuitem = new JMenuItem("新建");
		newMenuitem.setMnemonic('N');
		newMenuitem.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				newBrowser();

			}

			private void newBrowser() {
				// TODO Auto-generated method stub
				WebBrowser b = new WebBrowser();
				/* b.setSize(this.getWidth(),this.getHeight()); */
				b.setSize(800, 600);
				b.setVisible(true);

			}

		});
		JMenuItem openMenuitem = new JMenuItem("打開");
		openMenuitem.setMnemonic('O');
		openMenuitem.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				// openLocalPage();
			}

		});
		JMenuItem closeMenuitem = new JMenuItem("關閉窗口");
		closeMenuitem.setMnemonic('C');
		closeMenuitem.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				close();
			}

			public void close() {
				// TODO Auto-generated method stub
				// this.setVisible(false);
				// this.disPose();

			}

		});
		JMenuItem exitMenuitem = new JMenuItem("退出");
		exitMenuitem.setMnemonic('E');
		exitMenuitem.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				exit();
			}

		});
		fileMenu.add(newMenuitem);
		fileMenu.add(openMenuitem);
		fileMenu.add(closeMenuitem);
		fileMenu.add(exitMenuitem);

		JMenu helpMenu = new JMenu("幫助");
		JMenuItem aboutMenuitem = new JMenuItem("關于");
		helpMenu.setMnemonic('H');
		aboutMenuitem.setMnemonic('A');
		helpMenu.add(aboutMenuitem);

		JMenuBar menuBar = new JMenuBar();
		menuBar.add(fileMenu);
		menuBar.add(helpMenu);
		this.setJMenuBar(menuBar);

	}

	public void hyperlinkUpdate(HyperlinkEvent e) {

		HyperlinkEvent.EventType type = e.getEventType();
		if (type == HyperlinkEvent.EventType.ACTIVATED) {
			displayPage(e.getURL());
		} else if (type == HyperlinkEvent.EventType.ENTERED) {
			messageLine.setText(e.getURL().toString());
		} else if (type == HyperlinkEvent.EventType.EXITED) {
			messageLine.setText("");
		}

		// TODO Auto-generated method stub

	}

	public void exit() {
		// TODO Auto-generated method stub
		if(JOptionPane.showConfirmDialog(this, "您確定要退出瀏覽器?", "退出",
				JOptionPane.YES_NO_OPTION)==JOptionPane.YES_OPTION)
				System.exit(0);
//				JOptionPane.YES_OPTION)
			
	}

	public void propertyChange(PropertyChangeEvent arg0) {
		// TODO Auto-generated method stub

	}

	/**
	 * @param args
	 */
	public static void main(String[] args) throws IOException {
	

		WebBrowser.setExitWhenLastWindowClosed(true);
		// 添加了窗口的位置、大小。
		WebBrowser browser = new WebBrowser();
		browser.setSize(800, 600);
		browser.setLocation(100, 100);
		browser.setVisible(true);
		browser.displayPage(browser.getHome());

	}

}