Re: how could the mighty emacs lack --fullscreen ?

[Jan D.]

Richard Stallman wrote:

>     I'll have a look.  One must move the settings of hints before the window is
>     mapped, since some window managers don't check positions and size after
>     mapping (twm, kde1, ...).
>
> I don't follow the reasoning here--could you explain?  Why isn't it
> enough just to figure out the proper sizes and put them on
> initial-frame-alist?  Sam Steinberg's message seems to suggest that it
> is.



First, let me say I was (partly) wrong here.  Emacs does indeed set 
hints before mapping the window.  It also sets hints after mapping (in 
the toolkit version at least), that confused me.

Sam wanted this:


(/ (- (display-pixel-height)                        ; got this
     (title-bar-pixel-height)                      ; WM-specific
     (* (menu-bar-pixel-height)                    ; ??
        (frame-parameter ?? 'menu-bar-lines))
     (* (tool-bar-pixel-height)                    ; ??
        (frame-parameter ?? 'tool-bar-lines)))
  (font--pixel-height (frame-parameter ?? 'font))) ; ??

The problem is the "(title-bar-pixel-height)".  There is just no way in 
X (I like X, but in this case it sucks) to find out this before mapping 
the window.

If you map the window with NorthWest gravity and at (0,0) you can find 
out (with translate coordinates) the size of the title bar and the size 
of the left side decoration (I've used this on other projects, I think 
it is a standard way of doing things).

So the problem is that the proper sizes is not known before you map a 
window, in Emacs terms create a frame, by then it is too late to set 
initial-frame-alist.

Also, note that menu-bar-lines in the toolkit version does not mean what 
it says.  It really only means on or off.


        Jan D.