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bug#5721: Feature request: Function that returns absolute coordinates
From: |
Jan Djärv |
Subject: |
bug#5721: Feature request: Function that returns absolute coordinates |
Date: |
Sun, 29 Sep 2013 17:59:04 +0200 |
29 sep 2013 kl. 12:26 skrev martin rudalics <rudalics@gmx.at>:
> > I'd like the request to be reopened, because the current function
> > `window-inside-absolute-pixel-edges' does not provide the requested
> > behaviour.
>
> I think your analysis is correct but will leave it to Jan to decide how
> to proceed.
>
I gave no opinion in the matter. I think it is a mistake to let users access
pixels. It worked fine with X and no toolkit or Lucid/Motif. But nowdays,
window manager do strange things and so does toolkits (Gtk+ don't create
separate windows for its widgets for example), so it is almost impossible to
get right.
Jan D.
> > Suppose no fringes, and header-line. All considerations for a GTK build.
> >
> > 0--------------------------------------*
> > | display |
> > | A----------------------------+ |
> > | | emacs@foo.bar + |
> > | |-B------------------------+ + |
> > | | | toolbar | | |
> > | | +------------------------+ | |
> > | | | menubar | | |
> > | | C------------------------+ | |
> > | | | | | |
> > | | | window | | |
> > | | | D---------+ | | |
> > | | | | tooltip | | | |
> > | | | +---------+ | | |
> > | | +------------------------+ | |
> > | *----------------------------* |
> > | |
> > *--------------------------------------*
>
> Where did/do we put the internal borders of the frame?
>
> > We have a buffer position D =
> > (D.x, D.y) in some window and want to display a tool-tip there. At the
> > moment,
> >
> > (posn-x-y (posn-at-point))
> >
> > gives us a position relative to C, so we would need it's absolute
> > position.
> >
> > But `window-absolute-pixel-edges' gives the absolute position of
> >
> > (C.x - (B.x - A.x), C.y - (B.y - A.y))
> > = (A.x , C.y - (B.y - A.y)) ,
> >
> > that is, it does not account for the width and height (B - A) of the
> > window managers decorations. Furthermore these sizes are unknown to the
> > lisp side, making it impossible to complete the desired task.
>
> I'm not sure whether we can correctly retrieve the decorations always
> and everywhere. But note that for maximized and full-screen frames
> there usually are no outer borders and with full-screen frames there's
> no titlebar either. How does your patch handle these?
>
> > So it seems to me that `window-absolute-pixel-edges' should return the
> > absolute position of C, such that the tool-tip (or other frame) may be
> > positioned at C + D.
> >
> > I noticed, that the frame struct already has members x_pixels_diff and
> > y_pixels_diff, such that
> >
> > (x_pixels_diff, y_pixels_diff) = (B.x - A.x, B.y - A.y) ,
> >
> > such that we may compute C with this values. So I propose extending
> > `calc_absolute_offset' by adding these pixel_diff values. For GTK this
> > appears to be especially easy, since these diff values already account
> > for the tool-bar and menu-bar sizes.
>
> martin
>
>
- bug#5721: Feature request: Function that returns absolute coordinates, (continued)
- bug#5721: Feature request: Function that returns absolute coordinates, Andreas Politz, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, Andreas Politz, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, martin rudalics, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, martin rudalics, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, martin rudalics, 2013/09/29
- bug#5721: Feature request: Function that returns absolute coordinates, Andreas Politz, 2013/09/29
bug#5721: Feature request: Function that returns absolute coordinates,
Jan Djärv <=