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Re: Allowing point to be outside the window?
From: |
Po Lu |
Subject: |
Re: Allowing point to be outside the window? |
Date: |
Sun, 05 Dec 2021 17:31:03 +0800 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.60 (gnu/linux) |
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Po Lu <luangruo@yahoo.com>
>> Cc: dick.r.chiang@gmail.com, emacs-devel@gnu.org
>> Date: Sun, 05 Dec 2021 17:15:25 +0800
>>
>> >> I meant to ask whether or not I can forgo calculating whether point is
>> >> outside the window, and just test whether or not cursor.vpos is -1 to
>> >> determine if the cursor should be displayed, when point is allowed to be
>> >> outside the window.
>> >
>> > No. I think it should be the other way around: first see if point is
>> > outside of the window, then force cursor.vpos to be negative. That's
>> > because redisplay resets that value to -1 whenever it isn't sure the
>> > cursor will stay in its old position.
>>
>> Thanks. Another question or two: I can't use the value "-1" for
>> cursor.vpos to indicate that point is outside the window, as it's
>> already treated specially by redisplay, correct?
>
> No, you can't. But the question is why do you need to? -1 there
> means the cursor position is unknown. Why do you need to know more
> than that, plus the fact that point is _allowed_ to be outside of the
> window?
>
>> Also, where should I put the code to test if cursor is invisible? I
>> think it should be after the label force_start, as forcing the start
>> could potentially adjust point to be inside the window.
>
> It goes back to the same question I asked above: why do you need to
> know that point is outside of the window? for what purposes?
>
> IOW, why not just let redisplay do its thing, without bothering to
> bring point into the window, when that is allowed?
I need to erase the phys cursor and to tell display_and_set_cursor to
not draw it: otherwise, the ghost of the cursor remains on-screen even
after point is moved out.
Thanks.
- Re: Allowing point to be outside the window?, (continued)
- Re: Allowing point to be outside the window?, dick, 2021/12/04
- Re: Allowing point to be outside the window?, tomas, 2021/12/04
- Re: Allowing point to be outside the window?, Po Lu, 2021/12/04
- Re: Allowing point to be outside the window?, Eli Zaretskii, 2021/12/04
- Re: Allowing point to be outside the window?, Po Lu, 2021/12/04
- Re: Allowing point to be outside the window?, Eli Zaretskii, 2021/12/05
- Re: Allowing point to be outside the window?, Po Lu, 2021/12/05
- Re: Allowing point to be outside the window?, Eli Zaretskii, 2021/12/05
- Re: Allowing point to be outside the window?, Po Lu, 2021/12/05
- Re: Allowing point to be outside the window?, Eli Zaretskii, 2021/12/05
- Re: Allowing point to be outside the window?,
Po Lu <=
- Re: Allowing point to be outside the window?, Eli Zaretskii, 2021/12/05
- Re: Allowing point to be outside the window?, Po Lu, 2021/12/05
- Re: Allowing point to be outside the window?, dick, 2021/12/04
- Re: Allowing point to be outside the window?, Eli Zaretskii, 2021/12/04
- Re: Allowing point to be outside the window?, dick, 2021/12/04
- Re: Allowing point to be outside the window?, Po Lu, 2021/12/04
Re: Allowing point to be outside the window?, John Ankarström, 2021/12/07