import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JToolBar;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
public class DnDWebBrowser extends JFrame {
private WebToolBar toolBar;
private WebBrowserPane browserPane = new WebBrowserPane();
public DnDWebBrowser() {
super("Drag-and-Drop Web Browser");
toolBar = new WebToolBar(browserPane);
browserPane.setDropTarget(new DropTarget(browserPane, DnDConstants.ACTION_COPY,
new DropTargetHandler()));
Container contentPane = getContentPane();
contentPane.add(toolBar, BorderLayout.NORTH);
contentPane.add(new JScrollPane(browserPane), BorderLayout.CENTER);
}
private class DropTargetHandler implements DropTargetListener {
public void drop(DropTargetDropEvent event) {
Transferable transferable = event.getTransferable();
if (transferable.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
event.acceptDrop(DnDConstants.ACTION_COPY);
try {
List fileList = (List) transferable.getTransferData(DataFlavor.javaFileListFlavor);
Iterator iterator = fileList.iterator();
while (iterator.hasNext()) {
File file = (File) iterator.next();
browserPane.goToURL(file.toURL());
}
event.dropComplete(true);
} catch (UnsupportedFlavorException flavorException) {
flavorException.printStackTrace();
event.dropComplete(false);
} catch (IOException ioException) {
ioException.printStackTrace();
event.dropComplete(false);
}
} else {
event.rejectDrop();
}
}
public void dragEnter(DropTargetDragEvent event) {
if (event.isDataFlavorSupported(DataFlavor.javaFileListFlavor))
event.acceptDrag(DnDConstants.ACTION_COPY);
else {
event.rejectDrag();
}
}
public void dragExit(DropTargetEvent event) {
}
public void dragOver(DropTargetDragEvent event) {
}
public void dropActionChanged(DropTargetDragEvent event) {
}
}
public static void main(String args[]) {
DnDWebBrowser browser = new DnDWebBrowser();
browser.setDefaultCloseOperation(EXIT_ON_CLOSE);
browser.setSize(640, 480);
browser.setVisible(true);
}
}
class WebBrowserPane extends JEditorPane {
private List history = new ArrayList();
private int historyIndex;
public WebBrowserPane() {
setEditable(false);
}
public void goToURL(URL url) {
displayPage(url);
history.add(url);
historyIndex = history.size() - 1;
}
public URL forward() {
historyIndex++;
if (historyIndex >= history.size())
historyIndex = history.size() - 1;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
public URL back() {
historyIndex--;
if (historyIndex < 0)
historyIndex = 0;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
private void displayPage(URL pageURL) {
try {
setPage(pageURL);
} catch (IOException ioException) {
ioException.printStackTrace();
}
}
}
class WebToolBar extends JToolBar implements HyperlinkListener {
private WebBrowserPane webBrowserPane;
private JButton backButton;
private JButton forwardButton;
private JTextField urlTextField;
public WebToolBar(WebBrowserPane browser) {
super("Web Navigation");
webBrowserPane = browser;
webBrowserPane.addHyperlinkListener(this);
urlTextField = new JTextField(25);
urlTextField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
URL url = new URL(urlTextField.getText());
webBrowserPane.goToURL(url);
} catch (MalformedURLException urlException) {
urlException.printStackTrace();
}
}
});
backButton = new JButton("back");
backButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.back();
urlTextField.setText(url.toString());
}
});
forwardButton = new JButton("forward");
forwardButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.forward();
urlTextField.setText(url.toString());
}
});
add(backButton);
add(forwardButton);
add(urlTextField);
}
public void hyperlinkUpdate(HyperlinkEvent event) {
if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
URL url = event.getURL();
webBrowserPane.goToURL(url);
urlTextField.setText(url.toString());
}
}
}
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