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Re: Drag and Drop Examples Anywhere

At 5:59 -0800 16/11/02, "Michael Purdy" <email@hidden> wrote:
>
>I'm searching for any drag and drop example code for dragging something
>from the OSX finder to my Java Application.
>
>In particular, I just want to be able to drag a file or alias to my
>application and I want to extract the file's path and display it.
>That's it. Anyone know where I can find some examples?

That's good timing, I only figured out how to do it myself yesterday!

Register a DropTargetListener on a component. That component must be the
active, topmost component. Figuring out *which* component was the hardest
part! In my case, that meant the viewport of the scroll pane that filled
my window.

new DropTarget(component, DnDConstants.ACTION_COPY_OR_MOVE, listener);

Your DropTargetListener has the following:

public void drop(DropTargetDropEvent ev)
{
try
{
Transferable trans = ev.getTransferable();
if (ev.isDataFlavorSupported(DataFlavor.javaFileListFlavor))
{
ev.acceptDrop(DnDConstants.ACTION_COPY);
List fileList = (List)trans.getTransferData(DataFlavor.javaFileListFlavor);
Iterator iter = fileList.iterator();
while( iter.hasNext() )
{
File file = (File) iter.next();
System.out.println("Drop "+file);
}
ev.dropComplete(true);
}
}
catch (Exception e)
{
e.printStackTrace();
}
}

You might also want to process dragEnter and dragExit to draw a border
or something round your component to provide visual feedback to the user.

-Rolf
--
Rolf Howarth, Square Box Systems Ltd, Stratford-upon-Avon UK.
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