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package tim.prune;
import java.awt.datatransfer.DataFlavor;
import java.io.File;
import java.net.URI;
import java.util.ArrayList;
import javax.swing.TransferHandler;
/**
* Class to listen for drag/drop events and react to dropping files on to the application
*/
public class FileDropHandler extends TransferHandler
{
/** App object for passing results back to */
private App _app = null;
/** Fixed flavour in case the java file list flavour isn't available */
private static DataFlavor _uriListFlavour = null;
/** Static block to initialise the list flavour */
static
{
try {_uriListFlavour = new DataFlavor("text/uri-list;class=java.lang.String");
} catch (ClassNotFoundException nfe) {}
}
/**
* Constructor
* @param inApp App object to pass results of drop back to
*/
public FileDropHandler(App inApp)
{
_app = inApp;
}
/**
* Check if the object being dragged can be accepted
* @param inSupport object to check
*/
public boolean canImport(TransferSupport inSupport)
{
boolean retval = inSupport.isDataFlavorSupported(DataFlavor.javaFileListFlavor)
|| inSupport.isDataFlavorSupported(_uriListFlavour);
// Modify icon to show a copy, not a move (+ icon on cursor)
if (retval) {
inSupport.setDropAction(COPY);
}
return retval;
}
/**
* Accept the incoming data and pass it on to the App
* @param inSupport contents of drop
*/
public boolean importData(TransferSupport inSupport)
{
if (!canImport(inSupport)) {return false;} // not allowed
boolean success = false;
ArrayList<File> dataFiles = new ArrayList<File>();
// Try a java file list flavour first
try
{
@SuppressWarnings("unchecked")
java.util.List<File> fileList = (java.util.List<File>)
inSupport.getTransferable().getTransferData(DataFlavor.javaFileListFlavor);
success = true;
for (File f : fileList)
{
if (f != null && f.exists())
{
if (f.isDirectory()) {
addDirectoryToList(f, dataFiles);
}
else if (f.isFile()) {
dataFiles.add(f);
}
}
}
} catch (Exception e) {} // exception caught, probably missing a javafilelist flavour - just continue
// If that didn't work, try a list of strings instead
if (!success)
{
try
{
String pathList = inSupport.getTransferable().getTransferData(_uriListFlavour).toString();
success = true;
for (String s : pathList.split("[\n\r]+"))
{
if (s != null && !s.equals(""))
{
File f = new File(new URI(s));
if (f.exists())
{
if (f.isDirectory()) {
addDirectoryToList(f, dataFiles);
}
else if (f.isFile()) {
dataFiles.add(f);
}
}
}
}
} catch (Exception e) {
System.err.println("exception: " + e.getClass().getName() + " - " + e.getMessage());
return false;
}
}
// Pass files back to app
if (!dataFiles.isEmpty()) {
_app.loadDataFiles(dataFiles);
}
return true;
}
/**
* Recursively-called method to add files from the given directory (and its subdirectories)
* to the given list of files
* @param inDir directory to add
* @param inList file list to append to
*/
private void addDirectoryToList(File inDir, ArrayList<File> inList)
{
if (inDir != null && inDir.exists() && inDir.canRead() && inDir.isDirectory() && inList != null)
{
for (String path : inDir.list())
{
if (path != null)
{
File f = new File(inDir, path);
if (f.exists() && f.canRead())
{
if (f.isFile())
{
// Add the found file to the list (if it's not in there already)
if (!inList.contains(f)) {
inList.add(f);
}
}
else if (f.isDirectory())
{
// Recursively add the files from subdirectories
addDirectoryToList(f, inList);
}
}
}
}
}
}
}
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