// FSTree.java
// A sample component for dragging & dropping a collection of files
// into a tree.
//
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import java.util.List;
import java.util.Iterator;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Insets;
import java.io.File;
import java.io.IOException;
public class FSTree extends JTree {
public FSTree() { super(); init(); }
public FSTree(TreeModel newModel) { super(newModel); init(); }
public FSTree(TreeNode root) { super(root); init(); }
public FSTree(TreeNode root, boolean asks) { super(root, asks); init(); }
private void init() {
// We don't want to export anything from this tree, only import
setDragEnabled(false);
setTransferHandler(new FSTransfer());
}
public class FSTransfer extends TransferHandler {
public boolean importData(JComponent comp, Transferable t) {
// Make sure we have the right starting points
if (!(comp instanceof FSTree)) {
return false;
}
if (!t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
return false;
}
// Grab the tree, its model and the root node
FSTree tree = (FSTree)comp;
DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode)model.getRoot();
try {
List data = (List)t.getTransferData(DataFlavor.javaFileListFlavor);
Iterator i = data.iterator();
while (i.hasNext()) {
File f = (File)i.next();
root.add(new DefaultMutableTreeNode(f.getName()));
}
model.reload();
return true;
}
catch (UnsupportedFlavorException ufe) {
System.err.println("Ack! we should not be here.\nBad Flavor.");
}
catch (IOException ioe) {
System.out.println("Something failed during import:\n" + ioe);
}
return false;
}
// We only support file lists on FSTrees...
public boolean canImport(JComponent comp, DataFlavor[] transferFlavors) {
if (comp instanceof FSTree) {
for (int i = 0; i < transferFlavors.length; i++) {
if (!transferFlavors[i].equals(DataFlavor.javaFileListFlavor)) {
return false;
}
}
return true;
}
return false;
}
}
}
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