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bug#35492: 27.0.50; set-mouse-color nop
From: |
Alan Third |
Subject: |
bug#35492: 27.0.50; set-mouse-color nop |
Date: |
Thu, 2 May 2019 19:46:35 +0100 |
User-agent: |
Mutt/1.11.3 (2019-02-01) |
On Wed, May 01, 2019 at 05:49:16PM -0400, Devon Sean McCullough wrote:
>
> > On May 1, 2019, at 5:11 PM, Alan Third <alan@idiocy.org> wrote:
> >
> > On Wed, May 01, 2019 at 07:07:53AM -0400, Devon Sean McCullough wrote:
> >>> On Apr 30, 2019, at 4:22 PM, Alan Third <alan@idiocy.org> wrote:
> >>> On Mon, Apr 29, 2019 at 02:18:42PM -0400, Devon Sean McCullough wrote:
> >>>> The following have no effect:
> >>>> (set-mouse-color "red")
> >>>> (set-mouse-color “yellow")
> >>>> (set-mouse-color "windowBackgroundColor")
> >>>> The mouse color should change.
> >>
> >>> I don’t think the NS port supports modifying the mouse pointer. It
> >>> looks like it could probably be handled with custom NSCursors.
> >>
> >> I see NS allows us to both read and write cursor images
> >> so a possible solution might involve (mouse-cursor-image nil)
> >> to get the current cursor image and (mouse-cursor-image nil image)
> >> to set it, either as a new primitive or an existing one I’m ignorant of.
> >> Lisp code thus replaces the cursor colors according to some heuristic;
> >> this notion struck me after giving image.c & image.el a cursory glance.
> >
> > It looks like it’s possible to get a copy of the image for the current
> > cursor, so it’s possible we could just modify that.
>
> Yes, that’s what I said.
Sorry, I misunderstood you.
The biggest stumbling block I can see is that we don’t have any way to
convert from an NSImage, which is what NSCursor returns, to something
we can edit from lisp (XPM, I assume?). So we’d have to implement
that.
The alternative, I suppose, would be to provide a custom set of
cursors that we can edit before using them.
> P.S. I would be foolish to do in C
> and it would be wise to allow Lisp
> to generate custom cursors too.
--
Alan Third