Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.sys.acorn.programmer > #1632

Re: Clipboard

Show all headers | View raw

In message <gemini.m2h8kr001leq90274.spamhater@keepyourfilthyspamtoyourself.co.uk>
          Alan Wrigley <spamhater@keepyourfilthyspamtoyourself.co.uk> wrote:

> Martin Wuerthner <spamtrap@mw-software.com> wrote:
>
> > You can make the Windows clipboard work in exactly the same way as the
> > RISC OS clipboard, i.e., the data is pulled from the owning
> > application at the moment a paste happens, so there is no need to push
> > the data to all the other machines in advance. When a copy happens on
> > a machine, it is enough for the local UniClip to remember that it is
> > the holder of the universal clipboard and to send messages around that
> > make the other UniClip instances claim the clipboard on all the
> > *other* machines. When a paste happens the data is pulled from the
> > clipboard owner. If the paste happned on the machine that owns the
> > universal clipboard the owner is the original application that claimed
> > the clipboard, not UniClip, so the existing RISC OS protocol works
> > perfectly. If a paste happens on one of the other machines, UniClip is
> > the owner and it pulls the data via the network from the UniClip
> > instance on the machine that owns the universal clipboard.
>
> I'm sorry, but I STILL don't see it.

Below I've described how your timed sequence would look under the scheme
that I proposed earlier. Hopefully this will make it clear how it works
and how it gets round the limitations that UniClip currently has.

10.01
User hits Ctrl-C on B. UniClip B notes that universal clipboard is owned
by B, sends message to UniClip A. The message tells A that the universal
clipboard is on B and that A should claim its local clipboard.
B does not request current clip nor does it claim the local clipboard.

10.02
User hits Ctrl-C on A while using MyApp. UniClip A notes that universal
clipboard is owned by B, sends message to UniClip B. The message tells B
that the universal clipboard is on A and that B should claim its local
clipboard.
A does not request current clip nor does it claim the local clipboard.

10.03
User hits Ctrl-V on B. UniClip B sends message to A requesting the clip.
UniClip A requests clip from MyApp and sends it to UniClip B which in
turn passes the 10.02 clip to the requesting application.

10.04
User hits Ctrl-C again on A while still using MyApp. Nothing happens as
universal clipboard is already owned by A and local clipboard stays with
MyApp. Only the local clipboard's contents is changed.

10.05
User hits Ctrl-V again on B. UniClip B sends message to A requesting the
clip. UniClip A requests clip from MyApp and sends it to UniClip B which
in turn passes to the requesting application. The clip send will be the
newer 10.04 clip.


This is what Steve, Martin and I have been getting at;

 1) On the machine that holds the universal clipboard, the local
    clipboard is owned by the application that (last) claimed it.
    On all other machines the local clipboard is owned by their
    copy of UniClip.

 2) The current clip is only send to another machine when it is
    requested on that machine. And this is done every time the clip
    is requested thus ensuring that the pasting application always
    gets the latest contents.

 3) As the actual clip remains with the application that stored it
    the clip can be delivered in any format that the application can
    convert it to.


The above should work fine on a network with only RISC OS machines.
The uncertain factor is Windows. Does it allow for UniClip to claim the
local clipboard but with pasting still under its control. Steve's found
something that suggests that this may be possible.

If it is, then it should be technically possible to avoid the problem
that started this thread. As Martin says, it's a lot of work so may not
be commercially viable but that's for you and R-Comp to decide.

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

Back to comp.sys.acorn.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

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

csiph-web