Re: Emacs canvas support

[Po Lu]

Eli Zaretskii <address@hidden> writes:


> That's the technical description of the implementation.  It doesn't
> explain when  canvases can be useful and for what purposes.

Canvases are useful for when I want to be able to control a portion of a
screen dynamically, in a fast way, from Lisp code.  For instance,
displaying a constantly changing bar chart or graph inside Emacs.

> But the result of this painting is some graphical object, similar to
> an image, that will be displayed within a buffer, right?

Correct.

> Did I miss the code that tells Emacs the click was on a canvas?  E.g.,
> if you click on a canvas, what does posn-object return when passed the
> click event as its argument?

Oops.  I missed that.  Thanks for bringing it up.