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Full Discussion: send characters to current window
Top Forums UNIX for Advanced & Expert Users send characters to current window Post 302201077 by bcw on Saturday 31st of May 2008 01:14:38 AM
Old 05-31-2008
send characters to current window
Before I re-invent the wheel...

I have written an on-screen keyboard & handwriting input client in Java (spare me please, I get paid to write Java and it will take some time to get back up to speed in C & X11).

In order to concentrate on the other bits, I took advantage of a hack that uses the '-text' facility of the estimable XVkbd package to actually send the recognized text to X11. My client does not accept the focus, so the text is sent to the focused window.

The Java client only sends a character, rather than the 'keydown-keyup' pair X11 uses, so Java latency isn't an issue, but I nevertheless get repeat characters - like a key was held down. I'm assuming this is from my misuse of XVkbd, spawned from the Java session.

I can rip up the XVkbd code to make something, but I will feel silly when someone points out that there is already an app or a library call that does this, or could easily be made to do this:

1) Accept a unicode character or string.
2) Put that to the X11 server definitively (little or no lag between 'keydown' and 'keyup').

An existing daemon or library call that can be wrapped with a daemon and spoken to over dbus would be good - something I can 'nice' to -5 perhaps, so that it just happens. User input on a tablet computer (what I'm writing for) isn't likely to be so rapid as to overwhelm the system.

I am aware of the Escher-X11 Java project, and that's no good - it doesn't avoid the possibility that the system will be too busy between times it gets around to running the JVM thread. Definitive at the system level is what's important here, so this aspect can be solved, and I/we can get on with writing Tablet support for Linux/Unix.

Thanks in advance for any help.

Cheers,
Bret
 

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LEARN ABOUT DEBIAN

dh_javadoc

DH_JAVADOC(1)							     Debhelper							     DH_JAVADOC(1)

NAME

       dh_javadoc - generate javadoc documentation and install in package directory

SYNOPSIS

       dh_javadoc [debhelper options] [-p<package>] [--sourcedir source path] [Java packages]

DESCRIPTION

       dh_javadoc is a debhelper program that is responsible for generating HTML Java documentation and installing it in package directories. This
       should be done in the documentaion package of all Java libraries. Normal Java programs should not be supplied with javadoc documentation
       (neither in their main package or in a separate documentation package)

       Any package specified as parameters will be installed into the first package dh_javadoc is told to act on. Use of the standard debhelper -p
       option is highly recommended.

       A file named debian/package.javadoc may list additional packages to have documentation generated. These should be separated by new lines.

       When the Java policy is modified, this script will also install links to the documentation in a common place so that javadoc pages may be
       interlinked; and also provide a substitution variable for documentation package dependencies.

       Javadoc generation is done using gjdoc, currently the only free javadoc implementation. When new features are added to this (such as
       overview files), this script will be modified accordingly.

OPTIONS

       --sourcedir source path
	   Specify the source path in which to look for Java source files.

       Java packages
	   Names of Java packages to be documented.

TODO

       +   Check parameters more carefully.

       +   Add substvar for documentation dependencies

       +   Don't put the 'common' directory in all packages - refer to one in /usr/share/gjdoc & insist on creating that dependency

       +   Other items depend on gjdoc improvements:

	   -	   Add package listings to common directory

	   -	   Generate dependency substvar based on additional doc packages used.

SEE ALSO

       debhelper(7)

       This program is designed similar to debhelper

AUTHOR

       Mark Howard <mh@debian.org>

4.7								    2012-04-16							     DH_JAVADOC(1)
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