Showing text in a buffer only when point is in a region

Showing text in a buffer only when point is in a region

[Narendra Joshi]

Hi,

I want to be able to keep some text visible in a buffer only when the
point is in a region. The moment the point leaves that region, I would
like to make the text invisible. How can I do this? I don't want to run
a timer which checks if the point is in the region or outside.

Best,
Narendra Joshi

Re: Showing text in a buffer only when point is in a region

[tomas]

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On Sat, Jan 28, 2017 at 06:03:57PM +0530, Narendra Joshi wrote:
> 
> Hi,
> 
> I want to be able to keep some text visible in a buffer only when the
> point is in a region. The moment the point leaves that region, I would
> like to make the text invisible. How can I do this? I don't want to run
> a timer which checks if the point is in the region or outside.

See "Overlays" or "Text Properties" in the Emacs Lisp manual. You can set
"point-entered" and "point-left" special properties (see "Properties with
Special Meanings", which are hooks to be called at those events.

Regards
- -- tomás
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Re: Showing text in a buffer only when point is in a region

[Stephen Berman]

On Sat, 28 Jan 2017 13:46:10 +0100 <tomas@tuxteam.de> wrote:

> On Sat, Jan 28, 2017 at 06:03:57PM +0530, Narendra Joshi wrote:
>> 
>> Hi,
>> 
>> I want to be able to keep some text visible in a buffer only when the
>> point is in a region. The moment the point leaves that region, I would
>> like to make the text invisible. How can I do this? I don't want to run
>> a timer which checks if the point is in the region or outside.
>
> See "Overlays" or "Text Properties" in the Emacs Lisp manual. You can set
> "point-entered" and "point-left" special properties (see "Properties with
> Special Meanings", which are hooks to be called at those events.

As of Emacs 25.1 (quoting the Info node referred to):

"These properties are obsolete; please use ‘cursor-sensor-functions’ instead."

Steve Berman

Re: Showing text in a buffer only when point is in a region

[tomas]

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On Sat, Jan 28, 2017 at 03:45:24PM +0100, Stephen Berman wrote:
> On Sat, 28 Jan 2017 13:46:10 +0100 <tomas@tuxteam.de> wrote:
> 
> > On Sat, Jan 28, 2017 at 06:03:57PM +0530, Narendra Joshi wrote:
> >> 
> >> Hi,
> >> 
> >> I want to be able to keep some text visible in a buffer [...]
> >
> > See "Overlays" or "Text Properties" in the Emacs Lisp manual. You can set
> > "point-entered" and "point-left" special properties [...]
> 
> As of Emacs 25.1 (quoting the Info node referred to):
> 
> "These properties are obsolete; please use ‘cursor-sensor-functions’ instead."

Thanks for the update

cheers
- -- t
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