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POJTable - drag and drop
 

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    <p>OK, this problem is out of my league. I'm trying to implement a GUI widget in swing that allows files to be dropped onto a JTable, and allows the rows of the JTable to be dragged for re-sorting. Think VLC's playlists or the one in iTunes.</p> <p>I got dropping files from the OS (Explorer, Finder, etc.) working just fine, but I'm having an impossible time with re-arranging the rows of the table, once the files are in. The problem is that when I add a custom TransferHandler to the table, dragging <em>from</em> the table is instantly killed. Here is some example code:</p> <pre><code>import javax.swing.*; public class TableTest { public static void main (String [] argv) { // setup table data String [] columns = new String [] {"Foo", "Bar", "Baz", "Quux"}; String [][] data = new String [][] {{"A", "B", "C", "D"}, {"1", "2", "3", "4"}, {"i", "ii", "iii", "iv"}}; // create table JTable table = new JTable(data, columns); // set up drag and drop table.setDragEnabled(true); table.setDropMode(DropMode.INSERT_ROWS); table.setFillsViewportHeight(true); TransferHandler dnd = new TransferHandler() { // here be code to handle drops, and one would // presume drag exporting, too }; table.setTransferHandler(dnd); JScrollPane scroll = new JScrollPane(table); // create and show window JFrame window = new JFrame(); window.getContentPane().add(scroll); window.pack(); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setVisible(true); } } </code></pre> <p>Run this code as-is and you'll see that you cannot initiate a drag on the table.If you comment out the call to setTransferHandler() on the table, dragging works (i.e., when I start dragging a table row, I get the X'd out circle cursor saying I can't drop there). But as soon as a TransferHandler is set for the table, I can't drag any rows. The problem has to be in the TransferHandler, but I've thoroughly troubleshot and debugged it, and have determined that dragging is never started once there is a TransferHandler on the table. What am I doing wrong?</p>
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    1. COHow odd. I get the same problem. I'm trying to remember if I've done any work where I had a table that supported both dragging from and to.
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      1. USwillcodejavaforfood
 

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