<AWT Dev> Unwanted MOUSE_MOVED break dispatching MOUSE_RELEASED to the right component

Tue Jan 9 08:09:00 UTC 2018

Hello Sadetsky,

The discussion you linked to me seems to be a similar problem, but the fix discussed there happens specifically in the method Container.retargetMouseEnterExit(…). The problem we have happens in MOUSE_MOVED, so while this fix might fix the problem in the discussion it won’t fix ours.

Kind Regards,
Matthias

From: Semyon Sadetsky <semyon.sadetsky at oracle.com>
Date: Monday, January 8, 2018 at 10:55 PM
To: "Weidemann, Matthias" <matthias.weidemann at sap.com>, "awt-dev at openjdk.java.net" <awt-dev at openjdk.java.net>
Cc: "Woersinger, Rolf-Martin" <rolf-martin.woersinger at sap.com>, "Denkel, Christian" <christian.denkel at sap.com>
Subject: Re: <AWT Dev> Unwanted MOUSE_MOVED break dispatching MOUSE_RELEASED to the right component

Hi Matthias,

Thank you for your e-mail.

It seems a fix for this bug is already under discussion on this thread:

http://mail.openjdk.java.net/pipermail/swing-dev/2017-December/008077.html

--Semyon

On 01/04/2018 04:56 AM, Weidemann, Matthias wrote:
Hello everyone,

we found a rare occurrence of a bug in JDK1.8 and onwards, might also occur earlier but we didn’t check for that.

In some instances MOUSE_MOVED events occur between a MOUSE_PRESSED and a MOUSE_RELEASED. In Container.java on MOUSE_PRESSED the component is remembered in an instance variable to send a corresponding MOUSE_RELEASED to it.
The same instance variable is used for the MOUSE_MOVED Event, so if there are MOUSE_MOVED Events between a MOUSE_PRESSED and MOUSE_RELEASED the corresponding MOUSE_RELEASE will be reported to the "wrong" component.

I attached a simple example to replicate the error.

I included hardware specifications, because the occurrence fluctuates with the hardware used. We got the best results to reproduce with the Macbook and the magic mouse shown below. With a trackpad it is almost impossible to replicate.

[cid:image001.jpg at 01D38929.66D18D30][cid:image002.jpg at 01D38929.66D18D30][cid:image003.jpg at 01D38929.66D18D30]

How to: Move the mouse in the blue rectangle VERY FAST from left to right or vice versa. Release the mousebutton near the end of the drag, while you are still in motion.

We are using a workaround for this, the same custom queue built into the example. If we are between MOUSE_PRESSED and MOUSE_RELEASED we do not dispatch MOUSE_MOVED Events.
We would still like to see this bug fixed or at least have different instance variables for MOUSE_PRESSED and MOUSE_MOVED so we get the MOUSE_RELEASE on the right component.

Kind Regards,
Matthias Weidemann

Matthias Weidemann
Software Developer, PI Technology UxP UI P&S (SE) Supp
SAP SE, Opelstr. 6, 68789 St. Leon - Rot, Germany

T +49 6227 7-45771 , E matthias.weidemann at sap.com

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