[Rd] Writing in R // R 4.2.0 on Windows doesn't work with Dasher
Tomas Kalibera
tom@@@k@||ber@ @end|ng |rom gm@||@com
Mon May 16 19:08:59 CEST 2022
On 5/15/22 16:10, Paulo Barata wrote:
>
> To the R developers,
>
> I noticed today that R 4.2.0 responds to the "Enter" character of
> Dasher version 5.0.0 beta in "Direct Entry" mode. An "Enter" in Dasher
> causes the R prompt to jump to the next line, as an "Enter" should do.
>
> No other characters (letters, digits, special characters like + = & ~
> | # $) are accepted by R 4.2.0 through Dasher.
>
> The "Enter" shows that, somehow, the communication between Dasher and
> R 4.2.0 through the Windows system is not completely curtailed.
Dear Paulo,
thanks for the report and thanks to all for the useful comments in the
followup discussion. I've committed a fix to R-devel, 82368, and I would
be grateful if you could test whether it fixes the problem for you. I've
tested it only on a small example which is using the same method to
insert keys to Rgui as Dasher does.
The problem is caused by a limitation in GraphApp, a library used by
Rgui and included in the R distribution. GraphApp has two modes: Unicode
windows (with this limitation) and non-Unicode windows (without it).
GraphApp uses Unicode windows when running in a multi-byte locale, and
as of R 4.2, this is the case for all systems on recent Windows where
the native encoding is UTF-8. This means that most likely R 4.1.3 didn't
work with Dasher on systems running in a multi-byte locale and that most
likely R 4.2.0 would work with Dasher on old Windows systems (where
UTF-8 cannot be used as native encoding).
Dasher uses SendInput/KEYEVENTF_UNICODE to inject text into Rgui, which
is fine as far as I can tell and should work. It didn't work, because
the Unicode windows didn't handle WM_CHAR nor WM_KEYDOWN/WM_KEYUP for
VK_PACKET. By design, Unicode windows get input via WM_IME_COMPOSITION
and WM_KEYDOWN, so I've added support for VK_PACKET to WM_KEYDOWN
(taking the logic in gdk as an example).
I am cc'ing Jose as Tinn-R has a similar problem, though this patch
doesn't solve it.
Best
Tomas
>
> Regards,
>
> Paulo Barata
>
> ----------------------------------------------------------
>
> On 13/05/2022 16:44, Paulo Barata wrote:
>> To the R developers,
>>
>> I would like to point out an issue that occurs with the new R 4.2.0
>> running on Windows; this is possibly related to the recent wide
>> changes made to the Windows port of R. The issue has to do with
>> writing of the R window.
>>
>> My computer runs on Windows 10 Professional 64-bit with all the
>> latest updates, and has a 4-core 8-thread Intel Xeon processor with
>> 32 Gb of RAM.
>>
>> I have some slight impairment in my hands, so for typing I avoid
>> using the computer keyboard as much as possible. For most of my
>> typing, I use the software Dasher, a kind of assistive technology
>> software. Dasher was created by the Inference Group led by Professor
>> David MacKay (died in 2016) at Cambridge University in England.
>> Later, Dasher was further developed by Ada Majorek (a Google
>> engineer, recently deceased).
>>
>> General information on Dasher and about the Dasher Project can be
>> found on the Inference Group page:
>>
>> http://www.inference.org.uk/dasher/
>>
>> An example of Dasher in action can be seen on this 2-minute YouTube
>> video:
>>
>> https://www.youtube.com/watch?v=nr3s4613DX8
>>
>> An one-hour YouTube video of a 2007 Google Talk by Professor MacKay
>> himself explaining the Dasher concept can be found here:
>>
>> https://www.youtube.com/watch?v=wpOxbesRNBc
>>
>> In the 2-minute video (the first YouTube address above), the sentence
>> written through Dasher, for actual use, needs to be copied and then
>> pasted into another software, say a text editor. But Dasher also has
>> a "Direct Entry" mode, where words typed are entered directly on the
>> screen of the text editor or other software -- this is how I use
>> Dasher to write on the R window.
>>
>> Using Dasher`s "Direct Entry" mode, for all effects, to write a word
>> through Dasher works exactly like writing the word through the normal
>> computer keyboard. Somehow (I do not know about system programming),
>> in "Direct Entry" mode, the output of Dasher is understood by the
>> computer as an input of the same nature as a keyboard input.
>>
>> But this is the issue: until R 4.1.3, R accepted normally the
>> word-typing through Dasher. But R 4.2.0 (and R 4.2.0-patched build
>> r82348, 12 May 2022) does not accept Dasher anymore.
>>
>> So, for now, if I wish to use R during some extended interactive
>> section (say, for a first look at a complex data set), and if I wish
>> to use Dasher for this interactive session, then I have to use R
>> 4.1.3. For using R through programming, I can use the new R 4.2.0, by
>> writing the program with Dasher in my text editor, and then pasting
>> that program into R.
>>
>> The latest Windows version of Dasher, version 5.0.0 beta, works
>> perfectly well with text editors (I use EditPad Pro), with
>> Microsoft-like Office packages (I use SoftMaker Office), for writing
>> e-mails (I use Mozilla Thunderbird), for writing on a web page (I use
>> mostly Mozilla Firefox). It worked perfectly well with R up to
>> version 4.1.3, but it does not work with R 4.2.0
>>
>> The latest Dasher 5.0.0 beta Windows installer and the source code
>> can be found on this page below (please click on "Windows installer"
>> and on "source code", just below the head "Dasher 5.0 beta release"):
>>
>> https://github.com/dasher-project/dasher/releases
>>
>> To set Dasher 5.0.0 beta to the "Direct Entry" mode, after installing
>> Dasher one should go to Preferences > Application > Application Style.
>>
>> Currently, after the passing of Ada Majorek, the Dasher Project is
>> being put forward by a group of people in England, but, it seems, at
>> a very slow pace. They have announced the existence of a version 6
>> beta, but this is only an online instance of Dasher, there is no
>> Windows installer, as far as I know. Their web page:
>>
>> https://dasher.acecentre.net/
>>
>> For me, and possibly for other users, the Dasher version 5.0.0 beta
>> for Windows that is available works perfectly well, and allows me to
>> use the computer with a proficiency that would be hardly possible
>> otherwise.
>>
>> Here I request that the R developers take a look at this word-typing
>> issue that happens with the new R 4.2.0 on Windows.
>>
>> As an R user (I work in ecological research), I can only thank the R
>> team for this really wonderful piece of statistical software that you
>> make freely available to us all.
>>
>> Regards,
>>
>> Paulo Barata
>>
>> (Rio de Janeiro - Brazil)
>>
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