progressdialog.java

MyDownloader 是一款使用 http 协议(RFC 1867)用于下载一个或多个文件到本地的简单易用的收费 Java 程序.使用托拽操作,你可以在一个页面内下载多个文件.在下载文件的过程当中

/*
 * Copyright 2007 JavaAtWork All rights reserved.
 * Use is subject to license terms.
 */
package com.javaatwork.mydownloader.dialog;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.Timer;

import com.javaatwork.mydownloader.MyDownloader;
import com.javaatwork.mydownloader.listeners.DownloadManager;
import com.javaatwork.mydownloader.utils.ByteFormatter;
import com.javaatwork.mydownloader.utils.LocaleManager;

/**
 * Shows the progress of the download.
 * 
 * @author Johannes Postma
 */
public class ProgressDialog extends JDialog {

	private static final long serialVersionUID = 8672661113098681632L;
	
	private JLabel labelStatus = null;
	private JLabel labelStat = new JLabel("");
	private JLabel labelFile = null;
	private JLabel labelFl = new JLabel("");
	private JLabel labelFiles = null;
	private JLabel labelProgress = null;
	private JLabel labelBytes = null;
	private JLabel labelBts = new JLabel("");
	
	private JButton buttonCancel = null;
	private JPanel commandPanel = new JPanel();
	private JPanel commandHelpPanel = new JPanel();
	private JPanel helpPanel = new JPanel();
	private JPanel mainPanel = new JPanel();
	private JProgressBar progressBar = new JProgressBar(0,100);
	private JProgressBar progressBarTotal = new JProgressBar(0,100);
	private Timer timer = null;
	private DownloadManager downloadManager = null;
	private LocaleManager localeManager = null;
		
	/**
	 * Progress dialog for the download process.
	 * 
	 * @param applet MyDownloader.
	 * @param downloadManager The download controller.
	 */
	public ProgressDialog(MyDownloader applet, DownloadManager downloadManager) {
		
		super(applet.getFrame(), true);
		
		setModal(true);
		setTitle("Download Process");
		
		this.localeManager = LocaleManager.getInstance();
		this.downloadManager = downloadManager;
		
		labelStatus = new JLabel(localeManager.getString("status") + "        ");
		labelFile = new JLabel(localeManager.getString("file") + " ");
		labelFiles = new JLabel(localeManager.getString("files") + " ");
		labelProgress = new JLabel(localeManager.getString("progress") + " ");
		labelBytes = new JLabel(localeManager.getString("bytes_retrieved") + " ");
		
		//initialises the helppanel
		helpPanel.setLayout(new GridLayout(5,2,5,5));
		helpPanel.add(labelStatus);
		helpPanel.add(labelStat);
		helpPanel.add(labelFile);
		helpPanel.add(labelFl);
		helpPanel.add(labelFiles);
		helpPanel.add(progressBarTotal);
		helpPanel.add(labelProgress);
		helpPanel.add(progressBar);
		helpPanel.add(labelBytes);
		helpPanel.add(labelBts);
		helpPanel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
		
		buttonCancel = new JButton(localeManager.getString("cancel"));
		commandHelpPanel.setLayout(new GridLayout(0,1,5,5));
		commandHelpPanel.add(buttonCancel);
		commandPanel.add(commandHelpPanel);
		
		// initialises the mainpanel
		mainPanel.setLayout(new BorderLayout());
		mainPanel.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createEmptyBorder(5,5,5,5), BorderFactory.createEtchedBorder()));
		mainPanel.add(helpPanel, BorderLayout.CENTER);
		
		buttonCancel.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				
				cancel();
			}
		});
		
		this.getContentPane().add(mainPanel, BorderLayout.CENTER);
		this.getContentPane().add(commandPanel, BorderLayout.SOUTH);
		this.pack();
		
		// sets the frame to the center
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		Dimension frameSize = this.getSize();

		if (frameSize.height > screenSize.height) {
			frameSize.height = screenSize.height;
		}

		if (frameSize.width > screenSize.width) {
			frameSize.width = screenSize.width;
		}

		setLocation(
			(screenSize.width - frameSize.width) / 2,
			(screenSize.height - frameSize.height) / 2);
	}
	
	/**
	 * Shows the progressbar.
	 */
	public void start() {
	
		progressBar.setStringPainted(true);
		progressBarTotal.setStringPainted(true);
		
		//	Create a timer.
		timer = new Timer(50, new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				
				if (!downloadManager.isFinished()) {
					labelStat.setText(downloadManager.getStatus());
					labelFl.setText(downloadManager.getFileInProgress());
					
					// if the size is unkown (contentlength is unkown)
					// the progressbar must be in the indeterminate mode
					if (downloadManager.getPercentCompleted() > 100) {
						progressBar.setIndeterminate(true);
						progressBar.setString("");
					} else {
						progressBar.setIndeterminate(false);
						progressBar.setValue(downloadManager.getPercentCompleted());
						progressBar.setString(downloadManager.getPercentCompleted() + "%");
					}
					progressBarTotal.setValue((int)((double)downloadManager.getFileInRow()/ (double)downloadManager.getNumberOfFiles() * 100));
					progressBarTotal.setString(downloadManager.getFileInRow() + " " + localeManager.getString("of") +" " + downloadManager.getNumberOfFiles());
					labelBts.setText(ByteFormatter.format(downloadManager.getTotalBytesDownloaded()));
				} else {
					close();
				}				
			}
		});		
	
		timer.start();
		
		setVisible(true);
				
	}
	
	/**
	 * Cancels the download.
	 */
	private void cancel() {
		downloadManager.cancel();
		setVisible(false);
	}
	
	/**
	 * Closes the dialog.
	 */
	private void close() {
		this.setVisible(false);
	}
	
	/**
	 * Shows a message.
	 * 
	 * @param message The message.
	 */
	public void showMessage(String message) {
		JOptionPane.showMessageDialog(this, message);		
	}
}