Hi Karel,
Offhand I'd say it's a bug, since it basically is a result of the
queued callback. Perhaps you could write up a JIRA issue and then we
can take a look at what might be the best way to handle it. Also, if you
have any thoughts as to how it could be fixed it would help (since
you've already spent some time looking into it).
Thanks,
~Roger
On 11/7/13 11:33 AM, Karel Hübl wrote:
Hi all,
I would like to ask, what is the correct usage (or intent) of
LocalManifest value map (accessed by getValue / putValue methods).
We used LocalManifest value map to store references to POJO
representing TreeView items participating in Cut and Paste.
When we put LocalManifest to Clipboard using Clipboard.setContent,
then we expected to get it back later using Clipboard.getContent().
However this works only for the first time. Next, when we create new
LocalManifest instance and put it to Clipboard we never get it back.
To test this behaviour call this testing method multiple times from UI
for severalt times:
*public**void*copyToClipboard() *throws*Exception {
System./out/.println(Clipboard./getContent/()+":
"+Clipboard./getContent/().getValue("A"));
LocalManifest manifest=*new*LocalManifest();
manifest.putValue("A", *new*Object());
Clipboard./setContent/(manifest);
}
You should get output similar to this:
org.apache.pivot.wtk.RemoteManifest@61d94155: null
org.apache.pivot.wtk.LocalManifest@3b5e37ac: java.lang.Object@26991ba7
org.apache.pivot.wtk.RemoteManifest@77315619: null
org.apache.pivot.wtk.RemoteManifest@7b875faa: null
org.apache.pivot.wtk.RemoteManifest@7499d141: null
org.apache.pivot.wtk.RemoteManifest@1e793e35: null
After some debugging, we realized that reason for this is
implementation of org.apache.pivot.wtk.Clipboard.setContent method.
The inner ClipboardOwner class clears the LocalManifest stored in
Clipboard.content static variable. The problém is, that the call to
lostOwnerhip notification method is not called directly from AWT
Clipboard.setContents method, but queued to AWT Event queue.
So the ClipboardOwner from previous call to
org.apache.pivot.wtk.Clipboard.setContent method, clears the new
Clipboard.content field immediately since it is executed later from
AWT event queue.
We now do not use clipboard to store POJO objects which are part of
cut and paste and everything is OK.
This is not problem for text, image and files, because of propagation
to AWT clipboard.
But now I am just curious. Is this a bug or feature?
Regards Karel
