On 10/08/2011 05:41 PM, Pavel Porvatov
wrote:
I got your point. What about this solution:
If in the compose mode, endCompositoin just sendComposedText
instead of sendCommittedText.
The patch is attached
Could you please explain the fix? May be it removes NPE but it
puzzles me. So if buffer.length() == 0 you invoke
sendCommittedText, right? But sendCommittedText commits
buffer, but buffer is empty. Looks strange...
BTW: the code like "if (!notInCompositionMode) {" a little bit
difficult to understand =) I'd preffer to avoid two negations
and use "if (notInCompositionMode)" and swap if/else blocks...
Regards, Pavel
Hi Pavel,
Sorry for the confusion. Here is some explanation, please
correct me if I am wrong:
1. There two modes which is judge from the buffer size: composed
mode when the buffer size is not zero and normal mode when the
buffer size is zero.
Right
2. The original code make no difference whether it is in the
composed mode or normal mode. In the normal mode, which buffer
size is zero, it sends the committed text. In the composed mode,
which buffer size is not zero, it also sends the committed code.
And NPE occurred here.
3. In the patch, I do not change the logic when in the normal
mode. (notInCompositionMode branch) Why? I guess it is the
logic of "Ends any input composition that may
currently be going on in this context. Depending on the
platform and possibly user preferences, this may commit or
delete uncommitted text. "
from the api spec....
Yes. But after your change the following code looks strange for
me:
if (!notInCompositionMode) {
....
} else {
>>>> sendCommittedText();
}
So if we are not in composition mode we send something (empty
string actually). Logically we shouldn't send anything (IMO),
because buffer is empty. Why should we do something at all if
endComposition is invoked and we are not in composition mode?
4. In the patch, the logic in the composed mode is that: if it
is in the composed mode, keep every thing as just composed :-)
I found a new bug (???) in the fix. If you apply the patch, run
the MouseEventTest2 test and follow the instructions from the bug
description NPE will not be thrown, but the JTextArea remains in
composition mode even after endComposition completion.
Right. It seems that we have to do some thing in the jdk :-). Here
it is:
The patch attached is just adding a null check at the beginning of
the mouseClicked method in DefaultCaret. So why the component is
null in the DefaultCaret? That because the caret has already been
deinstalled. It seems to be an order problem of mouse event and the
event which endCompositon sent. The endComposition will exchange the
caret and deinstall the old one. On the other hand, mouse click
event was happening on the old caret. So the component of the old
caret is null now. NPE happens.
Regards, Pavel
--
Yours Charles