centeredfilechooser.java

来自「MyDownloader 是一款使用 http 协议(RFC 1867)用于下载」· Java 代码 · 共 142 行

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

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.HeadlessException;
import java.awt.Toolkit;
import java.awt.event.MouseListener;

import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JList;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

import com.javaatwork.mydownloader.utils.LocaleManager;
import com.javaatwork.mydownloader.utils.Logger;

/**
 * A JFileChooser that is in the center of the screen. 
 * 
 * @author Johannes Postma
 */ 
public class CenteredFileChooser extends JFileChooser {

	/**
	 * serialVersionUID
	 */
	private static final long serialVersionUID = -5006688261460210335L;

	/**
	 * Creates a new CenteredFileChooser
	 */
	public CenteredFileChooser() {
		super();

		UIManager.put("FileChooser.readOnly", Boolean.TRUE);
		this.setMultiSelectionEnabled(true);
		this.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
		
		// remove the file rename functionality in the JFileChooser
		// this is done for JDK 1.4 and less
		// the preferred way is UIManager.put("FileChooser.readOnly", Boolean.TRUE) (JDK 1.5) see above;
		JList list = searchJList(this);
		if (list != null) {
			String listenerClassName;
			MouseListener[] listeners = list.getMouseListeners();
			for (int i = 0; i < listeners.length; i++) {
				listenerClassName = listeners[i].getClass().getName();
				if (listenerClassName.indexOf("SingleClick") != -1) {
					list.removeMouseListener(listeners[i]);
					break;
				}
			}
		}
	
		
		final String dialogTitle = LocaleManager.getInstance().getDialogTitle();

		// the dialogtitle must come from a resourcebundle
		// the title is not given in the english resourcebundle
		// and therefore the return dialogtitle is null
		// the default dialogtitle will be used.
		if (dialogTitle != null) {

			try {
				SwingUtilities.invokeLater(new Runnable() {
					public void run() {
						setDialogTitle(dialogTitle);
					}
				});
			} catch (Exception e) {
				Logger.log("CenteredFileChooser", "CenteredFileChooser()", e.toString());
			}
		}
		
	}

	/**
	 * Creates a JDialog.
	 * 
	 * @param parent The parent component.
	 * @throws HeadlessException If an error occurred.
	 */
	protected JDialog createDialog(Component parent) throws HeadlessException {
		JDialog dialog = super.createDialog(parent);
		
		//  sets the frame to the center
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		Dimension frameSize = dialog.getSize();

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

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

		dialog.setLocation(
			(screenSize.width - frameSize.width) / 2,
			(screenSize.height - frameSize.height) / 2);
		
		return dialog;
	}
	
	/**
	 * Returns the JList of a JFileChooser.
	 * 
	 * @param fileChooser The JFileChooser.
	 * @return JList
	 */
	private JList searchJList(Container fileChooser) {
		
		JList ret = null;
		
		if (fileChooser instanceof JList) {
			ret = (JList) fileChooser;
		}
	
		else {
			Component[] children = fileChooser.getComponents();
			
			for (int i = children.length - 1; i >= 0; i--) {
				if (children[i] instanceof Container) {
					ret = searchJList((Container) children[i]);
					if (ret != null) {
						break;
					}
				}
			}
		}

		return ret;
	}

}