Bookmark utility part 3
Drag & Drop out
As I said two weeks ago, we will try do develop a bookmark utility. Thus
it would be necessary to not only receive drop objects, but also send some.
This week we will make our application the source of the drag and drop
gesture.
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If you did not work with the D&D package, java.awt.dnd,
two weeks ago, please take some time to browse through the classes and
see what is there. Do not get me wrong; you should not memorize the methods,
just look quickly through the classes of this package.
Hint: If you have not downloaded the Java API Documentation,
now is the time to do so. See Getting started section
for instructions.
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Now you will try to make another small drag and drop test program.
When you select a piece of text from your application and drag it to an
external program that accepts drop gestures, like Word word WordPad, the
text should appear in this application. For this you could use a GUI component
of your choice, for example JTextField or JTextPane in your application.
This could be a bit more trick than it sounds if you have not worked
with the DnD package before. Try to figure some of the connections between
the classes yourself, but please search for some examples if you are completely
stuck with this problem.
Hint:
DragGestureListener
,
DragSourceListener
,
DragSource.createDefaultDragGestureRecognizer(...),
DnDConstants.ACTION_COPY, java.awt.datatransfer.DataFlavor
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Since we are aiming at a bookmark utility here, we also need to drop
URLs to a browser. Confirm that this also works with your test application
above, and make the necessary changes.
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