Commit 1c3d7a13 authored by Chong Yidong's avatar Chong Yidong
Browse files

Update Coordinates and Windows node of Lisp manual.

* doc/lispref/windows.texi (Window Sizes): Move window-top-line,
window-left-column, and window-*-pixel-edges to Coordinates and
Windows node.
(Coordinates and Windows): Restore window-edges doc.
parent 90ec88df
2011-11-23 Chong Yidong <cyd@gnu.org>
* windows.texi (Window Sizes): Move window-top-line,
window-left-column, and window-*-pixel-edges to Coordinates and
Windows node.
(Coordinates and Windows): Restore window-edges doc.
2011-11-21 Martin Rudalics <rudalics@gmx.at>
* windows.texi (Windows and Frames, Splitting Windows): Fix
......
......@@ -376,7 +376,7 @@ Bars}). At the top of the window is an optional header line
line (@pxref{Mode Line Format}).
Emacs provides several functions for finding the height and width of
a window. Except where noted, these heights and widths are reported
a window. Except where noted, Emacs reports window heights and widths
as integer numbers of lines and columns respectively. On a graphical
display, each ``line'' and ``column'' actually corresponds to the
height and width of a ``default'' character specified by the frame's
......@@ -439,26 +439,6 @@ that of the root window on that frame. If @var{window} is omitted or
@code{nil}, it defaults to the selected window.
@end defun
@cindex window position
The following functions can be used to determine the position of a
window relative to the window area of its frame:
@defun window-top-line &optional window
This function returns the distance, in lines, between the top of
@var{window} and the top of the frame's window area. For instance,
the return value is 0 if there is no window above @var{window}. If
@var{window} is omitted or @code{nil}, it defaults to the selected
window.
@end defun
@defun window-left-column &optional window
This function returns the distance, in columns, between the left edge
of @var{window} and the left edge of the frame's window area. For
instance, the return value is 0 if there is no window to the left of
@var{window}. If @var{window} is omitted or @code{nil}, it defaults
to the selected window.
@end defun
@cindex window body height
@cindex body height of a window
@cindex window body width
......@@ -535,45 +515,12 @@ can be resized in the desired direction. To determine that, use the
function @code{window-resizable}. @xref{Resizing Windows}.
@end defun
The following functions can be used to find a window's size and
position in pixels. Though mostly useful on graphical displays, they
can also be called on text-only terminals, where the screen area of
each text character is taken to be ``one pixel''.
@defun window-pixel-edges &optional window
This function return a list of pixel coordinates for the edges of
@var{window}. If @var{window} is omitted or @code{nil}, it defaults
to the selected window.
The return value has the form @code{(@var{left} @var{top} @var{right}
@var{bottom})}. The list elements are, respectively, the X coordinate
of the left window edge, the Y coordinate of the top edge, one more
than the X coordinate of the right edge, and one more than the Y
coordinate of the bottom edge. The origin coordinate @samp{(0,0)} is
taken to be the top left corner of the frame's window area.
These edge values include the space used by the window's scroll bar,
margins, fringes, header line, and mode line, if any.
@end defun
@defun window-inside-pixel-edges &optional window
This function is like @code{window-pixel-edges}, except that it
returns the edge coordinates for the window's text area, rather than
the edge coordinates for the window itself. @var{window} must specify
a live window.
@end defun
@defun window-absolute-pixel-edges &optional window
This function is like @code{window-pixel-edges}, except that it
returns the edge coordinates relative to the top left corner of the
display screen.
@end defun
@defun window-inside-absolute-pixel-edges &optional window
This function is like @code{window-inside-pixel-edges}, except that it
returns the edge coordinates relative to the top left corner of the
display screen. @var{window} must specify a live window.
@end defun
@xref{Coordinates and Windows}, for more functions that report the
positions of various parts of a window relative to the frame, from
which you can calculate its size. In particular, you can use the
functions @code{window-pixel-edges} and
@code{window-inside-pixel-edges} to find the size in pixels, for
graphical displays.
@node Resizing Windows
@section Resizing Windows
......@@ -2976,32 +2923,90 @@ is off the screen due to horizontal scrolling:
@end group
@end example
@node Coordinates and Windows
@section Coordinates and Windows
@cindex frame-relative coordinate
@cindex coordinate, relative to frame
@cindex window position
This section describes functions that report the position of a
window. Most of these functions report positions relative to the
window's frame. In this case, the coordinate origin @samp{(0,0)} lies
near the upper left corner of the frame. For technical reasons, on
graphical displays the origin is not located at the exact corner of
the graphical window as it appears on the screen. If Emacs is built
with the GTK+ toolkit, the origin is at the upper left corner of the
frame area used for displaying Emacs windows, below the title-bar,
GTK+ menu bar, and tool bar (since these are drawn by the window
manager and/or GTK+, not by Emacs). But if Emacs is not built with
GTK+, the origin is at the upper left corner of the tool bar (since in
this case Emacs itself draws the tool bar). In both cases, the X and
Y coordinates increase rightward and downward respectively.
Except where noted, X and Y coordinates are reported in integer
character units, i.e. numbers of lines and columns respectively. On a
graphical display, each ``line'' and ``column'' corresponds to the
height and width of a default character specified by the frame's
default font.
@defun window-edges &optional window
This function returns a list of the edge coordinates of @var{window}.
If @var{window} is omitted or @code{nil}, it defaults to the selected
window.
This section describes how to relate screen coordinates to windows.
The return value has the form @code{(@var{left} @var{top} @var{right}
@var{bottom})}. These list elements are, respectively, the X
coordinate of the leftmost column occupied by the window, the Y
coordinate of the topmost row, the X coordinate one column to the
right of the rightmost column, and the Y coordinate one row down from
the bottommost row.
@defun window-at x y &optional frame
This function returns the window containing the specified cursor
position in the frame @var{frame}. The coordinates @var{x} and @var{y}
are measured in characters and count from the top left corner of the
frame. If they are out of range, @code{window-at} returns @code{nil}.
Note that these are the actual outer edges of the window, including
any header line, mode line, scroll bar, fringes, and display margins.
On a text-only terminal, if the window has a neighbor on its right,
its right edge includes the separator line between the window and its
neighbor.
@end defun
If you omit @var{frame}, the selected frame is used.
@defun window-inside-edges &optional window
This function is similar to @code{window-edges}, but the returned edge
values are for the text area of the window. They exclude any header
line, mode line, scroll bar, fringes, display margins, and vertical
separator.
@end defun
@defun coordinates-in-window-p coordinates window
This function checks whether a particular frame position falls within
the window @var{window}.
@defun window-top-line &optional window
This function returns the Y coordinate of the topmost row of
@var{window}, equivalent to the @var{top} entry in the list returned
by @code{window-edges}.
@end defun
@defun window-left-column &optional window
This function returns the X coordinate of the leftmost column of
@var{window}, equivalent to the @var{left} entry in the list returned
by @code{window-edges}.
@end defun
The argument @var{coordinates} is a cons cell of the form @code{(@var{x}
. @var{y})}. The coordinates @var{x} and @var{y} are measured in
characters, and count from the top left corner of the screen or frame.
The following functions can be used to relate a set of
frame-relative coordinates to a window:
The value returned by @code{coordinates-in-window-p} is non-@code{nil}
if the coordinates are inside @var{window}. The value also indicates
what part of the window the position is in, as follows:
@defun window-at x y &optional frame
This function returns the live window at the frame-relative
coordinates @var{x} and @var{y}, on frame @var{frame}. If there is no
window at that position, the return value is @code{nil}. If
@var{frame} is omitted or @code{nil}, it defaults to the selected
frame.
@end defun
@defun coordinates-in-window-p coordinates window
This function checks whether a window @var{window} occupies the
frame-relative coordinates @var{coordinates}, and if so which part of
the window that is. @var{window} should be a live window.
@var{coordinates} should be a cons cell of the form @code{(@var{x}
. @var{y})}, where @var{x} and @var{y} are frame-relative coordinates.
If there is no window at the specified position, the return value is
@code{nil} . Otherwise, the return value is one of the following:
@table @code
@item (@var{relx} . @var{rely})
......@@ -3038,6 +3043,44 @@ The function @code{coordinates-in-window-p} does not require a frame as
argument because it always uses the frame that @var{window} is on.
@end defun
The following functions return window positions in pixels, rather
than character units. Though mostly useful on graphical displays,
they can also be called on text-only terminals, where the screen area
of each text character is taken to be ``one pixel''.
@defun window-pixel-edges &optional window
This function returns a list of pixel coordinates for the edges of
@var{window}. If @var{window} is omitted or @code{nil}, it defaults
to the selected window.
The return value has the form @code{(@var{left} @var{top} @var{right}
@var{bottom})}. The list elements are, respectively, the X pixel
coordinate of the left window edge, the Y pixel coordinate of the top
edge, one more than the X pixel coordinate of the right edge, and one
more than the Y pixel coordinate of the bottom edge.
@end defun
@defun window-inside-pixel-edges &optional window
This function is like @code{window-pixel-edges}, except that it
returns the pixel coordinates for the edges of the window's text area,
rather than the pixel coordinates for the edges of the window itself.
@var{window} must specify a live window.
@end defun
The following functions return window positions in pixels, relative
to the display screen rather than the frame:
@defun window-absolute-pixel-edges &optional window
This function is like @code{window-pixel-edges}, except that it
returns the edge pixel coordinates relative to the top left corner of
the display screen.
@end defun
@defun window-inside-absolute-pixel-edges &optional window
This function is like @code{window-inside-pixel-edges}, except that it
returns the edge pixel coordinates relative to the top left corner of
the display screen. @var{window} must specify a live window.
@end defun
@node Window Configurations
@section Window Configurations
......
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