diff options
author | Xue Fuqiao <xfq@gnu.org> | 2014-02-27 20:58:23 +0800 |
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committer | Xue Fuqiao <xfq@gnu.org> | 2014-02-27 20:58:23 +0800 |
commit | de37b1f449795b9c61c3e8212b698e1ec7482223 (patch) | |
tree | 3277cf791c6e52f86712c9e8cb52dd639b0b3108 /doc/lispref/windows.texi | |
parent | 154ba7966c355a9d2db4d8763a78e75e068fe920 (diff) | |
parent | 8603bdb3b7ab4c4faa10ddadcdc2708228717220 (diff) |
Document some (perhaps incomplete) pixelwise window operations.
* doc/lispref/windows.texi (Window Sizes, Resizing Windows):
Document some pixelwise window operations.
Diffstat (limited to 'doc/lispref/windows.texi')
-rw-r--r-- | doc/lispref/windows.texi | 71 |
1 files changed, 62 insertions, 9 deletions
diff --git a/doc/lispref/windows.texi b/doc/lispref/windows.texi index f19a08c85e7..08d82f57a93 100644 --- a/doc/lispref/windows.texi +++ b/doc/lispref/windows.texi @@ -427,26 +427,55 @@ height of a frame is not the same as the height of its windows, since a frame may also contain an echo area, menu bar, and tool bar (@pxref{Size and Position}). -@defun window-total-height &optional window +@defun window-total-height &optional window round This function returns the total height, in lines, of the window @var{window}. If @var{window} is omitted or @code{nil}, it defaults to the selected window. If @var{window} is an internal window, the return value is the total height occupied by its descendant windows. + +If @var{window}'s pixel height is not an integral multiple of its +frame's character height, the number of lines occupied by @var{window} +is rounded internally. This is done in a way such that, if +@var{window} is a parent window, the sum of the total heights of all +its children internally equals the total height of @var{window}. + +If the optional argument @var{round} is @code{ceiling}, this function +will return the smallest integer larger than @var{window}'s pixel +height divided by the character height of @var{window}'s frame; if it +is @code{floor}, return the largest integer smaller than +@var{window}'s pixel height divided by the character height of +@var{window}'s frame. Any other value of @var{round} means to return +the internal total height of @var{window}. @end defun -@defun window-total-width &optional window +@defun window-total-width &optional window round This function returns the total width, in columns, of the window @var{window}. If @var{window} is omitted or @code{nil}, it defaults to the selected window. If @var{window} is internal, the return value is the total width occupied by its descendant windows. + +If @var{window}'s pixel width is not an integral multiple of its +frame's character width, the number of lines occupied by @var{window} +is rounded internally. This is done in a way such that, if +@var{window} is a parent window, the sum of the total widths of all +its children internally equals the total width of @var{window}. + +If the optional argument @var{round} is @code{ceiling}, this function +will return the smallest integer larger than @var{window}'s pixel +width divided by the character width of @var{window}'s frame; if it is +@code{floor}, return the largest integer smaller than @var{window}'s +pixel width divided by the character width of @var{window}'s frame. +Any other value of @var{round} means to return the internal total +width of @var{window}. @end defun -@defun window-total-size &optional window horizontal +@defun window-total-size &optional window horizontal round This function returns either the total height or width of the window @var{window}. If @var{horizontal} is omitted or @code{nil}, this is equivalent to calling @code{window-total-height} for @var{window}; otherwise it is equivalent to calling @code{window-total-width} for -@var{window}. +@var{window}. The optional argument @code{ROUND} is handled as for +@code{window-total-height} and @code{window-total-width}. @end defun @cindex full-width window @@ -479,7 +508,7 @@ which does not include the mode or header line. Similarly, the @dfn{body width} is the width of the text area, which does not include the scroll bar, fringes, or margins. -@defun window-body-height &optional window +@defun window-body-height &optional window pixelwise This function returns the body height, in lines, of the window @var{window}. If @var{window} is omitted or @code{nil}, it defaults to the selected window; otherwise it must be a live window. @@ -489,7 +518,7 @@ that counts as a whole line; to exclude such a partially-visible line, use @code{window-text-height}, below. @end defun -@defun window-body-width &optional window +@defun window-body-width &optional window pixelwise This function returns the body width, in columns, of the window @var{window}. If @var{window} is omitted or @code{nil}, it defaults to the selected window; otherwise it must be a live window. @@ -571,7 +600,7 @@ changed except by resizing the frame (@pxref{Size and Position}). arguments. Resizing an internal window causes its child windows to be resized to fit the same space. -@defun window-resizable window delta &optional horizontal ignore +@defun window-resizable window delta &optional horizontal ignore pixelwise This function returns @var{delta} if the size of @var{window} can be changed vertically by @var{delta} lines. If the optional argument @var{horizontal} is non-@code{nil}, it instead returns @var{delta} if @@ -596,9 +625,12 @@ Instead, it considers the minimum-height window to be one consisting of a header (if any), a mode line, plus a text area one line tall; and a minimum-width window as one consisting of fringes, margins, and scroll bar (if any), plus a text area two columns wide. + +If the optional argument @code{pixelwise} is non-@code{nil}, +@var{delta} will be interpreted as pixels. @end defun -@defun window-resize window delta &optional horizontal ignore +@defun window-resize window delta &optional horizontal ignore pixelwise This function resizes @var{window} by @var{delta} increments. If @var{horizontal} is @code{nil}, it changes the height by @var{delta} lines; otherwise, it changes the width by @var{delta} columns. A @@ -611,6 +643,9 @@ the window cannot be resized as demanded, an error is signaled. The optional argument @var{ignore} has the same meaning as for the function @code{window-resizable} above. +If the optional argument @code{pixelwise} is non-@code{nil}, +@var{delta} will be interpreted as pixels. + The choice of which window edges this function alters depends on the values of the option @code{window-combination-resize} and the combination limits of the involved windows; in some cases, it may alter @@ -623,12 +658,15 @@ bottom or right edge of a window, use the function @c shrink-window, and shrink-window-horizontally are documented in the @c Emacs manual. They are not preferred for calling from Lisp. -@defun adjust-window-trailing-edge window delta &optional horizontal +@defun adjust-window-trailing-edge window delta &optional horizontal pixelwise This function moves @var{window}'s bottom edge by @var{delta} lines. If optional argument @var{horizontal} is non-@code{nil}, it instead moves the right edge by @var{delta} columns. If @var{window} is @code{nil}, it defaults to the selected window. +If the optional argument @code{pixelwise} is non-@code{nil}, +@var{delta} will be interpreted as pixels. + A positive @var{delta} moves the edge downwards or to the right; a negative @var{delta} moves it upwards or to the left. If the edge cannot be moved as far as specified by @var{delta}, this function @@ -639,6 +677,21 @@ moved. If this is not possible for some reason (e.g., if that adjacent window is fixed-size), it may resize other windows. @end defun +@cindex pixelwise, resizing windows +@defopt window-resize-pixelwise +If the value of this user option is non-@code{nil}, window resizing +operations will be pixelwise. This currently affects the following +functions: @code{split-window}, @code{maximize-window}, +@code{minimize-window}, @code{fit-window-to-buffer} and +@code{fit-frame-to-buffer}, and all functions that symmetrically +resize a parent window. + +Note that when a frame's pixel size is not a multiple of the frame's +character size, at least one window may get resized pixelwise even if +this option is nil. The default value of this user option is +@code{nil}. +@end defopt + The following commands resize windows in more specific ways. When called interactively, they act on the selected window. |