New clipboard API for front ends, and textarea progress

John-Mark Bell jmb at
Sun Feb 24 23:05:32 GMT 2013

On Sun, 2013-02-24 at 22:34 +0000, Steve Fryatt wrote:
> On 10 Jan, Michael Drake wrote in message
>     <530c15f056tlsa at>:
> > In article <mpro.mgds7b08fs7pc01k4.lists at>,
> >    Steve Fryatt <lists at> wrote:
> > 
> > > That shouldn't be too tricky to sort. I'm a little busy at present with
> > > non-computery stuff, but will try to take a look in the next couple of
> > > weeks if no-one else gets there first.
> > 
> > Thanks, that would be great.  All pastes happen as a result of passing
> > KEY_PASTE to the core, so maybe it can request the clipboard when it
> > passes that to the core, and then when the core calls gui_get_clipboard,
> > maybe it will be easier?
> Will gui_poll be called between KEY_PASTE being passed in to the core and
> gui_get_clipboard getting called in return?  This would potentially have to
> happen several times -- and the required number could vary.

gui_poll will only ever be called from the main loop. Beyond that, we
make no guarantees.

> If not, is it safe for the front end to go and make calls to its own
> gui_poll before gui_get_clipboard returns? I'm not sure[1] if RISC OS
> defines that a task won't get other poll codes (eg. redraws) during a
> message exchange; if not, then there's the potential for the core to get
> called for something else before gui_get_clipboard returns.

User messages have higher priority than any others, so if there is a
user message waiting, it will take precedence. I don't believe this
permits any assumption about not having to deal with other message types
(or other user messages, for that matter)

However, I believe this is mostly moot, as we fixed paste some time ago:


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