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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 18:05:43 +0200 |
Hello.
29 sep 2013 kl. 18:02 skrev Jan Djärv <jan.h.d@swipnet.se>:
> Hello.
>
> 29 sep 2013 kl. 17:41 skrev Andreas Politz <politza@hochschule-trier.de>:
>
>> martin rudalics <rudalics@gmx.at> writes:
>>
>>> I'm not sure whether we can correctly retrieve the decorations always
>>> and everywhere.
>>
>> It seems to me, that x_real_positions (xfns.c) does the right thing
>> independent of the WM, i.e. it searches the last parent before the root
>> Window, assumes that it is the outermost Window of the frame and
>> computes the difference to the inner Emacs window (FRAME_X_WINDOW).
>>
>
> This is known to be wrong. For example, if some Gtk+ version does create
> separate X windows for menu bar and tool bar, the approach gives the offset
> to the Emacs text area below the tool bar.
>
> If Gtk+ does NOT use separate windows for the menu- and/or tool-bar, but
> instead uses the FRAME_X_WINDOW, you get the coordinates to the menu- and/or
> tool bar.
Forgot to mention that the window manager window that the title bar is drawn in
does not need to be a parent of any Emacs X window. In that case you can not
get the size of the decorations at all.
Jan D.
>
>>
>> The patch works for me with GTK, with internal-border-width and
>> full-screen set, with Xmonad as well as fluxbox. `border-width' in
>> make-frame does not seem to make any difference, it's probably set via a
>> GTK style (?). Anyway the only problem I sometimes ran into is a race
>> condition, resulting in y_pixels_diff being to small. But this is only
>> temporarily until I move the frame, i.e. x_real_positions gets called
>> and is most likely due to GTK windows bee-ing only partially mapped.
>>
>> I think we can figure this out, when it becomes clear, which absolute
>> position `window-absolute-pixel-edges' should actually return.
>
> Race conditions are common when a window manager is involved. Another reason
> to keep pixels private and not export them to Elisp.
>
> Jan D..
>
bug#5721: Feature request: Function that returns absolute coordinates, Jan Djärv, 2013/09/29