ch.randelshofer.gui.datatransfer
Class FileTextFieldTransferHandler

java.lang.Object
  javax.swing.TransferHandler
      ch.randelshofer.gui.datatransfer.FileTextFieldTransferHandler

All Implemented Interfaces:

java.io.Serializable

public class FileTextFieldTransferHandler
extends javax.swing.TransferHandler

The FileTextFieldTransferHandler can be used to add drag and drop support for JTextFields, which contain the path to a file.

Version:

1.0 September 8, 2007 Created.

Author:

Werner Randelshofer

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.TransferHandler

javax.swing.TransferHandler.DropLocation, javax.swing.TransferHandler.TransferSupport

Field Summary

Fields inherited from class javax.swing.TransferHandler

COPY, COPY_OR_MOVE, LINK, MOVE, NONE

Constructor Summary

FileTextFieldTransferHandler()
Creates a new instance.

Method Summary

boolean	canImport(javax.swing.JComponent comp, java.awt.datatransfer.DataFlavor[] transferFlavors)
protected java.awt.datatransfer.Transferable	createTransferable(javax.swing.JComponent comp)
protected void	exportDone(javax.swing.JComponent comp, java.awt.datatransfer.Transferable data, int action) This method is called after data has been exported.
protected java.awt.datatransfer.DataFlavor	getImportFlavor(java.awt.datatransfer.DataFlavor[] flavors, javax.swing.text.JTextComponent c) Try to find a flavor that can be used to import a Transferable.
int	getSourceActions(javax.swing.JComponent comp) This is the type of transfer actions supported by the source.
protected void	handleReaderImport(java.io.Reader in, javax.swing.text.JTextComponent c, boolean useRead) Import the given stream data into the text component.
boolean	importData(javax.swing.JComponent comp, java.awt.datatransfer.Transferable t)

Methods inherited from class javax.swing.TransferHandler

canImport, exportAsDrag, exportToClipboard, getCopyAction, getCutAction, getPasteAction, getVisualRepresentation, importData

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileTextFieldTransferHandler

public FileTextFieldTransferHandler()

Creates a new instance.

Method Detail

importData

public boolean importData(javax.swing.JComponent comp,
                          java.awt.datatransfer.Transferable t)

Overrides:

importData in class javax.swing.TransferHandler

createTransferable

protected java.awt.datatransfer.Transferable createTransferable(javax.swing.JComponent comp)

Overrides:

createTransferable in class javax.swing.TransferHandler

canImport

public boolean canImport(javax.swing.JComponent comp,
                         java.awt.datatransfer.DataFlavor[] transferFlavors)

Overrides:

canImport in class javax.swing.TransferHandler

getImportFlavor

protected java.awt.datatransfer.DataFlavor getImportFlavor(java.awt.datatransfer.DataFlavor[] flavors,
                                                           javax.swing.text.JTextComponent c)

Try to find a flavor that can be used to import a Transferable. The set of usable flavors are tried in the following order:

1. First, an attempt to find a text/plain flavor is made.
2. Second, an attempt to find a flavor representing a String reference in the same VM is made.
3. Lastly, DataFlavor.stringFlavor is searched for.

handleReaderImport

protected void handleReaderImport(java.io.Reader in,
                                  javax.swing.text.JTextComponent c,
                                  boolean useRead)
                           throws javax.swing.text.BadLocationException,
                                  java.io.IOException

Import the given stream data into the text component.

Throws:

javax.swing.text.BadLocationException

java.io.IOException

getSourceActions

public int getSourceActions(javax.swing.JComponent comp)

This is the type of transfer actions supported by the source. Some models are not mutable, so a transfer operation of COPY only should be advertised in that case.

Overrides:

getSourceActions in class javax.swing.TransferHandler

Parameters:

comp - The component holding the data to be transfered. This argument is provided to enable sharing of TransferHandlers by multiple components.

Returns:

This is implemented to return NONE if the component is a JPasswordField since exporting data via user gestures is not allowed. If the text component is editable, COPY_OR_MOVE is returned, otherwise just COPY is allowed.

exportDone

protected void exportDone(javax.swing.JComponent comp,
                          java.awt.datatransfer.Transferable data,
                          int action)

This method is called after data has been exported. This method should remove the data that was transfered if the action was MOVE.

Overrides:

exportDone in class javax.swing.TransferHandler

Parameters:

comp - The component that was the source of the data.

data - The data that was transferred or possibly null if the action is NONE.

action - The actual action that was performed.