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Re: Clipboard

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In message <gemini.m2dzv7006i384009c.alan@alanwrigley.com>
          Alan Wrigley <alan@alanwrigley.com> wrote:

> There's been a discussion in the last couple of days on c.s.a.misc about
> problems with UniClip and the global clipboard. I want to raise the issue
> here to get some feedback from others.
>
> The basic problem is this: UniClip (which attempts to share the clipboard
> between more than one machine running either RISC OS or Windows) can only
> operate properly by taking continual ownership of the 'global' clipboard in
> RISC OS on non-Select machines.

Why? Unless I'm missing something the following should allow UniClip to
work correctly without affecting other applications.

Lets say we have 4 machines (A,B,C,D) each with UniClip installed. When
an application on C claims the clipboard C's UniClip sends a message to
the other 3 machines saying that C now owns the clipboard. The UniClips
on A,B,D claim their clipboards upon reception and note that C now owns
the 'universal' (I'm assuming that's what Uni stands for) clipboard.

When an application on A requests the clipboard contents the request is
handled by A's UniClip which passes the request to C along with the list
of preferred filetypes. The UniClip on C requests the contents from the
application that has the 'universal' clipboard using the supplied list.
(If the request comes from a Windows machine the list may have to be
forced to allow only text format.)

The application sends the contents, in the most appropriate format, back
to UniClip on C which passes the data back to UniClip on A which in turn
sends it to the application that issued the initial request.

Please note that it doesn't matter which application holds the clipboard
we only need to know on which machine it is. It also doesn't matter that
the contents may change without notification (if the application already
owned the clipboard) as we don't fetch the data until it is requested.

Requests on C are handled outside of UniClip so should work as per
normal, at least until another machine claims the universal clipboard.

Lots of glossing over the nitty-gritty but the above seems sound to me.
The only thing I'm not sure about is Windows as I don't know how its
clipboard works internally but if there's some notification when its
contents changes then it should be okay.

-- 
Fred Graute
http://www.stronged.iconbar.com/

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Thread

Clipboard Alan Wrigley <alan@alanwrigley.com> - 2012-04-12 23:01 +0100
  Re: Clipboard Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-12 23:32 +0100
    Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 09:50 +0100
      Re: Clipboard Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-13 22:11 +0100
  Re: Clipboard Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-04-12 23:46 +0100
    Re: Clipboard Fred Graute <fjgraute@casema.nl> - 2012-04-13 02:19 +0200
      Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 10:16 +0100
    Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 10:15 +0100
      Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 10:30 +0100
        Re: Clipboard Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-04-13 13:35 +0100
          Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 14:26 +0100
            Re: Clipboard Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-04-13 16:42 +0100
              Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 17:04 +0100
            Re: Clipboard Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-04-13 21:43 +0100
              Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 23:21 +0100
      Re: Clipboard Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-04-13 13:41 +0100
        Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 14:29 +0100
          Re: Clipboard Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-04-13 21:52 +0100
        Re: Clipboard Martin Wuerthner <spamtrap@mw-software.com> - 2012-04-13 16:13 +0200
  Re: Clipboard Fred Graute <fjgraute@casema.nl> - 2012-04-13 02:19 +0200
    Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 09:57 +0100
      Re: Clipboard Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-13 22:21 +0100
        Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-13 23:06 +0100
          Re: Clipboard Martin Wuerthner <spamtrap@mw-software.com> - 2012-04-14 00:33 +0200
            Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-14 09:15 +0100
              Re: Clipboard Martin Wuerthner <spamtrap@mw-software.com> - 2012-04-14 16:18 +0200
                Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-14 17:02 +0100
                Re: Clipboard Fred Graute <fjgraute@casema.nl> - 2012-04-15 02:12 +0200
                Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-15 11:46 +0100
                Re: Clipboard "John Williams (News)" <UCEbin@tiscali.co.uk> - 2012-04-15 13:09 +0200
                Re: Clipboard Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-04-14 21:08 +0100
                Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-14 21:22 +0100
          Re: Clipboard Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-13 23:54 +0100
            Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-14 09:17 +0100
              Re: Clipboard Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-14 10:48 +0100
                Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-14 11:07 +0100
                Re: Clipboard Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-14 11:31 +0100
                Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-14 12:14 +0100
                Re: Clipboard Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> - 2012-04-14 12:53 +0100
                Re: Clipboard Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-14 14:30 +0100
  Re: Clipboard Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-04-17 18:46 +0100
  Re: Clipboard Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-04-20 05:52 +0200
    Re: Clipboard Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-04-20 23:15 +0100
    Re: Clipboard Vince M Hudd <vinceh@softrock.co.uk> - 2012-04-21 11:01 +0100

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