Drag and Drop (Trying to do a copy but it does a Move instead)?
I have implemented drag and drop throughout my application and it works fine as long as I drag from a non-editable component (Table, TextArea, etc.) to an editable component (TextArea or TextField). However, When I drag and drop from an editable component to another editable component it does a move instead. How do I force it to do a copy? I looked at the description of exportAsDrag(JComponent comp, InputEvent e, int action) method and it even says for the action that no matter what you put in there "...the value may be changed during the course of the drag operation". What exactly causes this possible change and how do I prevent it from happening?
This is the constructor I currently have:
public TextAreaPanel(Document doc)
super(doc);
setMargin(new Insets(12,12,12,12));
setDragEnabled(true);
addMouseListener(new MouseAdapter()
@Override public void mousePressed(MouseEvent e)
if(e.getButton() != MouseEvent.BUTTON1)
TextAreaPanel area = (TextAreaPanel)e.getSource();
area.getTransferHandler().exportAsDrag(area, e, TransferHandler.COPY);
}I forgot to mention before. The location of the component having the text copied into it is in a different JInternalFrame than the one where the text is being copied from (not sure if that matters or not).
Edited by: Dont_Know on Jan 18, 2008 6:25 AM
Edited by: Dont_Know on Jan 18, 2008 6:28 AM
If your problem persists get yourself a micro USB cable (sold separately), you can restore your Apple TV from iTunes:
Remove ALL cables from Apple TV. (if you don't you will not see Apple TV in the iTunes Source list)
Connect the micro USB cable to the Apple TV and to your computer.
Open iTunes.
Select your Apple TV in the Source list, and then click Restore.
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Hi Guys,
Iam into implementing drag and drop of cell contents between 2 different tables,say Table1 and Table2.(Iam not dragging and dropping rows or cells,Just copying the content of one cell to another).
Have extended the java tutorial class "TableTransferHandler" and "StringTransferHandler" under http://java.sun.com/docs/books/tutorial/uiswing/examples/dnd/index.html#ExtendedDndDemo to satisfy my needs.
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Dont be taken aback with the code I have put.It just to show what I have done..
My questions are put at the end of the post..
//String Transfer Handler class.
public abstract class StringTransferHandler extends TransferHandler {
protected abstract String exportString(JComponent c);
protected abstract void importString(JComponent c, String str);
protected abstract void cleanup(JComponent c, boolean remove);
protected Transferable createTransferable(JComponent c) {
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String str = (String)t.getTransferData(DataFlavor.stringFlavor);
importString(c, str);
return true;
} catch (UnsupportedFlavorException ufe) {
} catch (IOException ioe) {
return false;
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for (int i = 0; i < flavors.length; i++) {
if ((DataFlavor.stringFlavor.equals(flavors))&& (selColIndex !=0)) {
return true;
return false;
}//TableTransferHandler classpublic class TableTransferHandler extends StringTransferHandler {
private int[] rows = null;
private int addIndex = -1; //Location where items were added
private int addCount = 0; //Number of items added.
protected String exportString(JComponent c) {
JTable table = (JTable)c;
rows = table.getSelectedRows();
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int selRowIndex = table.getSelectedRow();
int selColIndex = table.getSelectedColumn();
String val = table.getValueAt(selRowIndex,selColIndex).toString();
buff.append(val);
return buff.toString();
protected void importString(JComponent c, String str) {
JTable target = (JTable)c;
DefaultTableModel model = (DefaultTableModel)target.getModel();
//int index = target.getSelectedRow();
int row = target.getSelectedRow();
int column = target.getSelectedColumn();
target.setValueAt(str, row, column);
protected void cleanup(JComponent c, boolean remove) {
}Now I want to put in the following functionality into my program...
[1]prevent dragging and dropping text in to the same table.That means I dont want to drag a cell content from Table1 and drop to another cell in Table1. Want to drag and drop cell content only from Table1 to Table2.
[2]Change cursor on a un-defined Target. That means how to prevent a drag from a particular column in Table1.Also how to prevent a drop to a particular column in Table2. How to change the cursor to a "NO-DRAG" cursoror "NO-DROP" cursor.
Could it be done using Drag Source Listener and drop Target Listener?.
If yes,How can these listeners attached to the table and how to do it?
If No,How Could it be done?
[3]Want to change the background colour of the cell being dragged and also the background colour of the target cell where the drop is made...
[4]Is there any out of the box way to make an undo in the target cell(where drop was made) so that the old cell value is brought back.
How can I extend my code to take care of the above said things.
Any help or suggestions is greatly appreciated.....
Edited by: Kohinoor on Jan 17, 2008 10:58 AMHi Guys,
Iam into implementing drag and drop of cell contents between 2 different tables,say Table1 and Table2.(Iam not dragging and dropping rows or cells,Just copying the content of one cell to another).
Have extended the java tutorial class "TableTransferHandler" and "StringTransferHandler" under http://java.sun.com/docs/books/tutorial/uiswing/examples/dnd/index.html#ExtendedDndDemo to satisfy my needs.
The drag is enabled for Table1 and table2 as follows.
jTable1.setDragEnabled(true);
jTable1.setTransferHandler(new TableTransferHandler());
jTable2.setDragEnabled(true);
jTable2.setTransferHandler(new TableTransferHandler());
Dont be taken aback with the code I have put.It just to show what I have done..
My questions are put at the end of the post..
//String Transfer Handler class.
public abstract class StringTransferHandler extends TransferHandler {
protected abstract String exportString(JComponent c);
protected abstract void importString(JComponent c, String str);
protected abstract void cleanup(JComponent c, boolean remove);
protected Transferable createTransferable(JComponent c) {
return new StringSelection(exportString(c));
public int getSourceActions(JComponent c) {
return COPY_OR_MOVE;
public boolean importData(JComponent c, Transferable t) {
if (canImport(c, t.getTransferDataFlavors())) {
try {
String str = (String)t.getTransferData(DataFlavor.stringFlavor);
importString(c, str);
return true;
} catch (UnsupportedFlavorException ufe) {
} catch (IOException ioe) {
return false;
protected void exportDone(JComponent c, Transferable data, int action) {
cleanup(c, action == MOVE);
public boolean canImport(JComponent c, DataFlavor[] flavors) {
JTable table = (JTable)c;
int selColIndex = table.getSelectedColumn();
for (int i = 0; i < flavors.length; i++) {
if ((DataFlavor.stringFlavor.equals(flavors))&& (selColIndex !=0)) {
return true;
return false;
}//TableTransferHandler classpublic class TableTransferHandler extends StringTransferHandler {
private int[] rows = null;
private int addIndex = -1; //Location where items were added
private int addCount = 0; //Number of items added.
protected String exportString(JComponent c) {
JTable table = (JTable)c;
rows = table.getSelectedRows();
StringBuffer buff = new StringBuffer();
int selRowIndex = table.getSelectedRow();
int selColIndex = table.getSelectedColumn();
String val = table.getValueAt(selRowIndex,selColIndex).toString();
buff.append(val);
return buff.toString();
protected void importString(JComponent c, String str) {
JTable target = (JTable)c;
DefaultTableModel model = (DefaultTableModel)target.getModel();
//int index = target.getSelectedRow();
int row = target.getSelectedRow();
int column = target.getSelectedColumn();
target.setValueAt(str, row, column);
protected void cleanup(JComponent c, boolean remove) {
}Now I want to put in the following functionality into my program...
[1]prevent dragging and dropping text in to the same table.That means I dont want to drag a cell content from Table1 and drop to another cell in Table1. Want to drag and drop cell content only from Table1 to Table2.
[2]Change cursor on a un-defined Target. That means how to prevent a drag from a particular column in Table1.Also how to prevent a drop to a particular column in Table2. How to change the cursor to a "NO-DRAG" cursoror "NO-DROP" cursor.
Could it be done using Drag Source Listener and drop Target Listener?.
If yes,How can these listeners attached to the table and how to do it?
If No,How Could it be done?
[3]Want to change the background colour of the cell being dragged and also the background colour of the target cell where the drop is made...
[4]Is there any out of the box way to make an undo in the target cell(where drop was made) so that the old cell value is brought back.
How can I extend my code to take care of the above said things.
Any help or suggestions is greatly appreciated.....
Edited by: Kohinoor on Jan 17, 2008 10:58 AM -
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hello world....
in the process of learning i'm trying to create a small java app that resizes and processes graphics, (using imagemagick api).
what i'd like to be able to do is drag the icon (or shortcut) to my java app and then have the app process that, just as a windows app would do. in fact all i need really is the location of the file the user has dragged and dropped onto my app, although it would be nice if i could indicate somewhere that the file was being processed!
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