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Re: local keymap patch for key-binding

From: Kim F. Storm
Subject: Re: local keymap patch for key-binding
Date: Wed, 13 Sep 2006 14:23:17 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

David Kastrup <address@hidden> writes:

> address@hidden (Kim F. Storm) writes:
>> Your patch still looks good to me.
> Well, I could not witness any adverse effect after some testing, it
> tracks the behavior of read-key-sequence closely.
> There is one concern that I have: the type of the "location" argument.
> This currently is a key sequence.  But it might make more sense to
> turn this into the "location" data structure that `event-start' and/or
> `event-end' return.  This would make it much easier to feed lookup-key
> with data produced from, say, `posn-at-x-y'.

I overlooked that part -- I actually thought it was such a location.

> In order to get this data easier, it might make sense to define a
> convenience function.
> (defun key-event (key)
>    "Return event from moused-base key sequence KEY."
>    (and (vectorp key)
>         (if (consp (aref key 0))
>             (aref key 0)
>           (and
>             (symbolp (aref key 0))
>             (> (length key) 1)
>             (consp (aref key 1))
>             (aref key 1)))))
> Maybe even in C, as this function can be executed without consing.

That is usually not the normal way to decide what should be in C...

> I found that the current usage in the help echo fixup stuff does not
> even have a key sequence to start from, just a mouse position.
> So it would likely make more sense to rework the location argument
> type to just be a mouse position.

in pixels or chars?

> That seems like the most basic unit for this argument that still makes
> sense.

True, but shouldn't it accept both types ... 

if you already have the full event, it seems wasteful to first convert
it to just a mouse position, pass that to key-binding and then use that
to derive what the original event was (eg. using posn-at-x-y).

Kim F. Storm <address@hidden> http://www.cua.dk

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