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bug#21173: 25.0.50; New frames positioned off screen with multiple monit
From: |
Andy Moreton |
Subject: |
bug#21173: 25.0.50; New frames positioned off screen with multiple monitors |
Date: |
Tue, 08 Sep 2015 23:26:41 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (windows-nt) |
On Tue 04 Aug 2015, Fran Litterio wrote:
> Glenn Morris <rgm <at> gnu.org> writes:
>
>> BTW, if it's just the lack of two physical monitors that's stopping
>> anyone working on such things, note that you can simulate such a setup
>> in software. Eg something like
>>
>> Xephyr +xinerama -screen 800x600 -origin 800,0 -screen 800x600 :1 &
>> DISPLAY=:1.0 gnome-session # or whatever you prefer
>
> Interesting, thanks. If frame 'left parameters are always
> non-negative under X, then this problem only happens on Windows,
> because the root cause is a failure to account for negative
> 'left values in certain monitor arrangements.
>
> Does anyone with multiple monitors and X see negative 'left
> parameters for frames on the leftmost monitor?
Yes. Arranging the monitors like this, so the desktop extends to both
monitors:
+----------+
| |
| DISPLAY2 |
| |+----------+
+----------+| |
| DISPLAY1 |
| (primary)|
+----------+
(display-monitor-attributes-list)
;; ==>
'(((geometry 0 0 1920 1080)
(workarea 0 0 1920 1050)
(mm-size 677 381)
(name . "\\\\.\\DISPLAY1")
(frames ...))
((geometry -1680 -1050 1680 1050)
(workarea -1680 -1050 1680 1050)
(mm-size 593 370)
(name . "\\\\.\\DISPLAY2")
(frames ...)))
;; For a frame on DISPLAY2:
(frame-parameter (window-frame) 'left) ;; ==> (+ -1668)
(frame-parameter (window-frame) 'top) ;; ==> (+ -1046)
The patch below fixes the problem for me on a Mingw64 build, and creates
frames at the correct position. Please try it and report the results.
(Copyright papers are not yet on file, but I mailed them today).
diff --git a/src/w32term.c b/src/w32term.c
index 82b05bffffec..ac55c6f73d32 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -5931,16 +5931,48 @@ x_calc_absolute_position (struct frame *f)
top_bottom_borders_height = 32;
}
+ /* If the desktop extends to multiple monitors then monitors to
+ the left of (or above) the primary monitor may use negative
+ coordinates. Find the X and Y offsets of the display origin. */
+ int display_left = 0;
+ int display_top = 0;
+ if (flags & (XNegative | YNegative))
+ {
+ Lisp_Object list;
+
+ list = Fw32_display_monitor_attributes_list (FRAME_X_DISPLAY (f));
+ while (CONSP (list))
+ {
+ Lisp_Object attributes = CAR(list);
+ Lisp_Object geometry;
+ Lisp_Object monitor_left, monitor_top;
+
+ list = CDR(list);
+
+ geometry = Fassoc (Qgeometry, attributes);
+ if (!NILP (geometry))
+ {
+ monitor_left = Fnth (make_number (1), geometry);
+ monitor_top = Fnth (make_number (2), geometry);
+
+ display_left = min (display_left, XINT (monitor_left));
+ display_top = min (display_top, XINT (monitor_top));
+ }
+ }
+ }
+
/* Treat negative positions as relative to the rightmost bottommost
position that fits on the screen. */
if (flags & XNegative)
f->left_pos = (x_display_pixel_width (FRAME_DISPLAY_INFO (f))
+ + display_left
- FRAME_PIXEL_WIDTH (f)
+ f->left_pos
- (left_right_borders_width - 1));
if (flags & YNegative)
f->top_pos = (x_display_pixel_height (FRAME_DISPLAY_INFO (f))
+ + display_top
- FRAME_PIXEL_HEIGHT (f)
+ f->top_pos
- (top_bottom_borders_height - 1));
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