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* doc/lispref/frames.texi (Multiple Terminals): Document

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`display-monitor-attributes-list' and `display-monitor-attributes'.
(Display Feature Testing): Add some notes about multi-monitor.

* etc/NEWS: Related edit.
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Xue Fuqiao 2014-02-27 18:15:52 +08:00
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@ -1,3 +1,9 @@
2014-02-27 Xue Fuqiao <xfq@gnu.org>
* frames.texi (Multiple Terminals): Document
`display-monitor-attributes-list' and `display-monitor-attributes'.
(Display Feature Testing): Add some notes about multi-monitor.
2014-02-27 Glenn Morris <rgm@gnu.org>
* minibuf.texi (Programmed Completion):

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doc/lispref/frames.texi
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@ -266,10 +266,6 @@ that X server. When you use two or more screens belonging to one
server, Emacs knows by the similarity in their names that they share a
single keyboard.
On some ``multi-monitor'' setups, a single X display outputs to more
than one physical monitor. Currently, there is no way for Emacs to
distinguish between the different physical monitors.
@deffn Command make-frame-on-display display &optional parameters
This function creates and returns a new frame on @var{display}, taking
the other frame parameters from the alist @var{parameters}.
@ -316,6 +312,61 @@ you can do this, you must first delete all the frames that were open
on that display (@pxref{Deleting Frames}).
@end defun
@cindex multi-monitor
On some ``multi-monitor'' setups, a single X display outputs to more
than one physical monitor. @code{display-monitor-attributes-list} and
@code{frame-monitor-attributes} can be used to obtain information
about each physical monitor on multi-monitor setups.
@defun display-monitor-attributes-list &optional display
This function returns a list of physical monitor attributes on
@var{display}. Each element of the list is an association list,
representing the attributes of each physical monitor. The first
element corresponds to the primary monitor.
Attributes for a physical monitor are:
@table @samp
@item geometry
Position and size in pixels in the form of @samp{(X Y WIDTH HEIGHT)}
@item workarea
Position and size of the workarea in pixels in the form of @samp{(X Y
WIDTH HEIGHT)}
@item mm-size
Width and height in millimeters in the form of @samp{(WIDTH HEIGHT)}
@item frames
List of frames dominated by the physical monitor
@item name
Name of the physical monitor as a string
@end table
where X, Y, WIDTH, and HEIGHT are integers. @samp{name} is optional.
A frame is dominated by a physical monitor when either the
largest area of the frame resides in the monitor, or the monitor
is the closest to the frame if the frame does not intersect any
physical monitors. Every non-tip frame (including invisible one)
in a graphical display is dominated by exactly one physical
monitor at a time, though it can span multiple (or no) physical
monitors.
@var{display} defaults to the selected frame's display.
@end defun
@defun frame-monitor-attributes &optional frame
This function returns the attributes of the physical monitor
dominating @var{frame}, which defaults to the selected frame.
A frame is dominated by a physical monitor when either the
largest area of the frame resides in the monitor, or the monitor
is the closest to the frame if the frame does not intersect any
physical monitors.
@end defun
@node Frame Parameters
@section Frame Parameters
@cindex frame parameters
@ -2370,12 +2421,13 @@ images, Emacs cannot display a tool bar.
This function returns the number of screens associated with the display.
@end defun
@c FIXME: Document `x-display-pixel-{width, height}'?
@defun display-pixel-height &optional display
This function returns the height of the screen in pixels.
On a character terminal, it gives the height in characters.
For graphical terminals, note that on ``multi-monitor'' setups this
refers to the pixel width for all physical monitors associated with
refers to the pixel height for all physical monitors associated with
@var{display}. @xref{Multiple Terminals}.
@end defun
@ -2388,14 +2440,23 @@ refers to the pixel width for all physical monitors associated with
@var{display}. @xref{Multiple Terminals}.
@end defun
@c FIXME: Document `x-display-mm-{width, height}'?
@defun display-mm-height &optional display
This function returns the height of the screen in millimeters,
or @code{nil} if Emacs cannot get that information.
For graphical terminals, note that on ``multi-monitor'' setups this
refers to the height for all physical monitors associated with
@var{display}. @xref{Multiple Terminals}.
@end defun
@defun display-mm-width &optional display
This function returns the width of the screen in millimeters,
or @code{nil} if Emacs cannot get that information.
For graphical terminals, note that on ``multi-monitor'' setups this
refers to the width for all physical monitors associated with
@var{display}. @xref{Multiple Terminals}.
@end defun
@defopt display-mm-dimensions-alist