From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: David Kastrup Newsgroups: gmane.emacs.devel Subject: Re: Emacs terminology (not again!?) Date: Sat, 18 Jan 2014 09:55:13 +0100 Organization: Organization?!? 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X-Received-From: 80.91.229.3 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:168659 Archived-At: Eli Zaretskii writes: >> Date: Fri, 17 Jan 2014 19:02:53 -0800 >> From: Daniel Colascione >> Cc: Per Starbäck , >> "Richard M. Stallman" , David Kastrup , >> "emacs-devel@gnu.org" >> >> Try making a mode that allows point to be off-screen while scrolling >> like it can be in most other editors. > > It is a common misconception that Emacs cannot do this. It can. How > do you think it pulls the trick of allowing you to scroll pixel-wise > through a very large image? > > It is a UI design decision in Emacs to always show point on screen. > But nothing prevents us from writing a mode that leaves point off > screen, or even abandoning that decision if we want (and I'm not > saying we do). The infrastructure is there, check out the vscroll > thingy and window-vscroll. That scrolls "graphically" (no idea whether it works on text terminals): basically it displaces your screen window by a given distance. There is no concept of a "window start" in terms of a text position that can move away from point, and no real way to implement that. Also I don't think you can mouse-mark a vscrolled off-screen region (which would require not setting point when drag-marking a region, but that seems conceivable) and paste it somewhere afterwards. It would be possible to experiment around with some of those things. Judging from my experience with pre-21.1 code (in connection with preview-latex), this would lead to quite a number of problem reports, just because it is an area that has been minimally exercised. Nothing wrong with that: cleaning out bugs is always a good idea. But it means that anybody experimenting with user interface design around that functionality would be well-advised to compile Emacs from Git and be in close communication with the developer list. Even when "nominally" Emacs has all the functionality he'll be needing. -- David Kastrup