<AWT Dev> [10] JDK-8148344: Java robot keypress should be able to use extended key code characters as ? ? ?.

Wed Aug 23 04:32:48 UTC 2017

Hi Semyon, As I see the case there are multiple paths to display characters onto a window, either by physical keyboard, soft keyboard or simulating a key event. I think the simulating a key event provides a superset of the keys that can be simulated whereas other methods provides only a subset of this superset.

This superset is enabled via the platform provided api which was designed to handle or produce the superset of key events. We simulate the key events via the Java Robot. Now this robot does not honor the non-ascii chars because of the very implementation. After this change that barrier is opened up to provide access to other languages as well. One can input decimal values of non-ascii chars thro' robot and get them displayed on to the window.

Thanks and regards,

Shashi

From: Semyon Sadetsky 
Sent: Wednesday, August 23, 2017 12:28 AM
To: Shashidhara Veerabhadraiah <shashidhara.veerabhadraiah at oracle.com>; awt-dev at openjdk.java.net
Subject: Re: <AWT Dev> [10] JDK-8148344: Java robot keypress should be able to use extended key code characters as ? ? ?.

Because press/release keycodes are not the same as characters. Character is produced from keycode or sequence of keycodes according to the selected kayboard layout.

--Semyon

On 08/22/2017 11:30 AM, Shashidhara Veerabhadraiah wrote:

Hi, Why not if the platform offers a way to simulate Unicode keyboard events? Here the platform api offers to accept decimal values or code values as input though a real keyboard may not be able to generate the same and converts it into a displayable Unicode char.

Thanks and regards,

shashi

From: Semyon Sadetsky 
Sent: Tuesday, August 22, 2017 10:03 PM
To: Shashidhara Veerabhadraiah HYPERLINK "mailto:shashidhara.veerabhadraiah at oracle.com"<shashidhara.veerabhadraiah at oracle.com>; HYPERLINK "mailto:awt-dev at openjdk.java.net"awt-dev at openjdk.java.net
Subject: Re: <AWT Dev> [10] JDK-8148344: Java robot keypress should be able to use extended key code characters as ? ? ?.

Hi,

Are you sure that keyPress/keyRelease should emulate UTF8 symbols? Physical keyboard cannot produces so many keycodes with a single press/release.

--Semyon

On 08/22/2017 01:57 AM, Shashidhara Veerabhadraiah wrote:

Hi All, Please review fix for the enhancement wherein the robot key press of non-ascii were interpreted as question marks.

Issue: The robot key press events was handling only the ascii inputs and ignored the other Unicode inputs. Either it was throwing illegal argument exception in windows or does nothing on the mac for those Unicode inputs.

Solution and fix: The platform specific api's was unable handle the non-ascii inputs. I have modified the api's to accept the non-ascii inputs and correspondingly send the message to the window to print the non-ascii characters as well. Below is the picture of how the non-ascii inputs are considered and printed onto the window.

The solution spans across windows and mac platform and still in search of a solution for the Linux platform. The solution implements key scanning only upon existing valid ascii key was not found and assumes it as Unicode key and sends the event to event queue to be processed as Unicode keys. Different formats are being used by different platform implementation of Unicode. For ex., per the below Unicode list, in the case of windows and mac, the key input can take decimal values whereas on Linux it can only take the Code values.

On Linux, I was able to get the KeySym of Unicode keys but was unable to fake the key event as there was no mechanism available for the same(which sends the key event to window). Please let me know if there is any such mechanism available to simulate Unicode key events on Linux platform. Hence I think to raise a bug for the Linux platform and close this JDK-8148344 bug.

Enhancement id: https://bugs.openjdk.java.net/browse/JDK-8148344

Webrev: HYPERLINK "http://cr.openjdk.java.net/%7Esveerabhadra/8148344/webrev.00/"http://cr.openjdk.java.net/~sveerabhadra/8148344/webrev.00/

Thanks and regards,

Shashi

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