X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2FFileDropHandler.java;fp=src%2Ftim%2Fprune%2FFileDropHandler.java;h=2c76385fc676963b8419319f31c8c1cb10de138a;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/FileDropHandler.java b/src/tim/prune/FileDropHandler.java
new file mode 100644
index 0000000..2c76385
--- /dev/null
+++ b/src/tim/prune/FileDropHandler.java
@@ -0,0 +1,158 @@
+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);
+						}
+					}
+				}
+			}
+		}
+	}
+}