Re: Coordinates and Windows

[Eli Zaretskii <eliz@gnu.org>]

> Date: Thu, 16 Jul 2015 20:23:06 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: emacs-devel@gnu.org
> 
>  > I don't see why.  Having the top-left corner of the frame as the
>  > reference point sounds simpler and more clear to me, and allows one to
>  > use it in the same way in all the builds.  No?
> 
> If by top-left corner you intend the top-left position of the menu bar,
> or if that's absent that of the top/left tool bar, or if that's absent
> too that of the internal border, or if that is absent too that of the
> root window

Yes.

> I agree.  Just that it's not all too trivial to calculate it.

In pixels or in rows?

>  >> To illustrate how little care has been applied to this so far, consider
>  >> the function `window-absolute-pixel-edges'.  With a maximized frame on
>  >> Windows XP this function returns (-4 -4 1676 964) here.
>  >
>  > I get (-8 28 1912 984) on Windows 7 and (-4 32 1916 1022) on XP, so at
>  > least the Y coordinate seems OK.
> 
> Just 32 pixels for title, menu, and tool bar?

Maybe I'm confused, but doesn't that include only the title and menu
on Windows?  Or maybe just the title?

> BTW, has Windows 7 an 8 pixel wide border by default?

How can I know?

> No, off-screen decorations are a Windows feature.  What I meant is that
> Gtk has some established, working features that albeit never worked on
> Windows.  And I'm afraid to break these features.

Isn't that what development is about -- breaking features and then
fixing the breakage?