From: Chong Yidong Date: Tue, 8 Nov 2011 15:34:21 +0000 (+0800) Subject: * doc/lispref/windows.texi (Resizing Windows): Simplify introduction. X-Git-Tag: emacs-pretest-24.0.92~121^2~20 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=e7313f338961e383f1f27bfa3d6083814d0d09ab;p=emacs.git * doc/lispref/windows.texi (Resizing Windows): Simplify introduction. Don't document enlarge-window, shrink-window, enlarge-window-horizontally, and shrink-window-horizontally; they are no longer preferred for calling from Lisp, and are already documented in the Emacs manual. --- diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog index 47214596c1a..7a1e34de159 100644 --- a/doc/lispref/ChangeLog +++ b/doc/lispref/ChangeLog @@ -4,6 +4,10 @@ window-text-height. Remove window-min-height and window-min-width discussion, referring instead to Emacs manual. (Splitting Windows, Resizing Windows): Add xref to Emacs manual. + (Resizing Windows): Simplify introduction. Don't document + enlarge-window, shrink-window, enlarge-window-horizontally, and + shrink-window-horizontally; they are no longer preferred for + calling from Lisp, and are already documented in the Emacs manual. 2011-11-07 Glenn Morris diff --git a/doc/lispref/windows.texi b/doc/lispref/windows.texi index 2bb30dd4cbc..46ed4476036 100644 --- a/doc/lispref/windows.texi +++ b/doc/lispref/windows.texi @@ -274,7 +274,7 @@ the leftmost child window for a horizontal combination. If @defun window-combined-p &optional window horizontal This function returns a non-@code{nil} value if and only if @var{window} is part of a vertical combination. If @var{window} is -omitted or nil, it defaults to the selected one. +omitted or @code{nil}, it defaults to the selected one. If the optional argument @var{horizontal} is non-@code{nil}, this means to return non-@code{nil} if and only if @var{window} is part of @@ -542,138 +542,74 @@ function @code{window-resizable}. @xref{Resizing Windows}. @cindex changing window size @cindex window size, changing -Emacs does not permit overlapping windows or gaps between windows, so -changing the size of a window always affects at least one other window. -When a frame contains just one window, that window can be resized only -by resizing the window's frame. The functions described below are -therefore meaningful only in the context of a frame containing at least -two windows. The size of the corresponding frame never changes when -invoking a function described in this section. - - The routines changing window sizes always operate in one dimension at -a time. This means that windows can be resized only either vertically -or horizontally. If a window shall be resized in both dimensions, it -must be resized in one dimension first and in the other dimension -afterwards. If the second resize operation fails, the frame might end -up in an unsatisfactory state. To avoid such states, it might be useful -to save the current window configuration (@pxref{Window Configurations}) -before attempting the first resize operation and restore the saved -configuration in case the second resize operation fails. - - Functions that resize windows are supposed to obey restrictions -imposed by window minimum sizes and fixed-size windows, see @ref{Window -Sizes}. In order to determine whether resizing a specific window is -possible in the first place, the following function can be used: + This section describes functions for resizing a window without +changing the size of its frame. Because live windows do not overlap, +these functions are meaningful only on frames that contain two or more +windows: resizing a window also changes the size of a neighboring +window. If there is just one window on a frame, its size cannot be +changed except by resizing the frame (@pxref{Size and Position}). + + Except where noted, these functions also accept internal windows as +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 side noup nodown This function returns @var{delta} if the size of @var{window} can be -changed vertically by @var{delta} lines. Optional argument -@var{horizontal} non-@code{nil} means to return @var{delta} if -@var{window} can be resized horizontally by @var{delta} columns. A -return value of zero means that @var{window} is not resizable. - -If @var{delta} is a positive number, this means that @var{window} shall -be enlarged by @var{delta} lines or columns. If @var{window} cannot be -enlarged by @var{delta} lines or columns, this function returns the -maximum value in the range from 0 to @var{delta} by which @var{window} -can be enlarged. - -If @var{delta} is a negative number, this means that @var{window} shall -be shrunk by -@var{delta} lines or columns. If @var{window} cannot be -shrunk by -@var{delta} lines or columns, this function returns the -minimum value in the range from @var{delta} to 0 that can be used for -shrinking @var{window}. - -Normally, the customizable variables @code{window-min-height} and -@code{window-min-width} specify the smallest allowable size of a -window. @xref{Change Window,,Deleting and Rearranging Windows, -emacs, The GNU Emacs Manual}. If resizing would result in making any -window smaller than this, this function usually signals an error. -However, if the optional argument @var{ignore} is non-@code{nil}, this -function ignores @code{window-min-height} and @code{window-min-width}, -as well as @code{window-size-fixed}. In that case, the minimum-height -window consists of a header (if any), a mode line, plus a text area -one line tall; the minimum-width window consists of any fringes, -margins and scroll bar, plus a text area two columns wide. - -If @var{ignore} denotes a window, this means to ignore restrictions for -that window only. If @var{ignore} equals the constant @code{safe}, this -means a live window may get as small as one line or two columns. - -Optional argument @var{noup} non-@code{nil} means don't go up in the -window tree but try to steal or distribute the space needed for the -resize operation among the other windows within @var{window}'s -combination. Optional argument @var{nodown} non-@code{nil} means don't -check whether @var{window} itself and its child windows can be resized. -@end defun - -The function @code{window-resizable} does not change any window sizes. -The following function does: +changed vertically by @var{delta} lines. If the optional argument +@var{horizontal} is non-@code{nil}, it instead returns @var{delta} if +@var{window} can be resized horizontally by @var{delta} columns. It +does not actually change the window size. + +If @var{window} is @code{nil}, it defaults to the selected window. + +A positive value of @var{delta} enlarges the window by that number of +lines or columns; a negative value of @var{delta} shrinks it. If +@var{delta} is non-zero, a return value of 0 means that the window +cannot be resized. + +Normally, the variables @code{window-min-height} and +@code{window-min-width} specify the smallest allowable window size. +@xref{Change Window,, Deleting and Rearranging Windows, emacs, The GNU +Emacs Manual}. However, if the optional argument @var{ignore} is +non-@code{nil}, this function ignores @code{window-min-height} and +@code{window-min-width}, as well as @code{window-size-fixed}. +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 @var{noup} is non-@code{nil}, this function +considers a resize operation that does not alter the window parent of +@var{window}, only its siblings. If the optional argument +@var{nodown} is non-@code{nil}, it does not attempt to check whether +@var{window} itself and its child windows can be resized. +@end defun @defun window-resize window delta &optional horizontal ignore -This function resizes @var{window} vertically by @var{delta} lines. The -argument @var{window} can denote an arbitrary window and defaults to the -selected one. An attempt to resize the root window of a frame will -raise an error. - -Second argument @var{delta} a positive number means @var{window} shall -be enlarged by @var{delta} lines. If @var{delta} is negative, that -means @var{window} shall be shrunk by -@var{delta} lines. - -Optional argument @var{horizontal} non-@code{nil} means to resize -@var{window} horizontally by @var{delta} columns. In this case a -positive @var{delta} means enlarge @var{window} by @var{delta} columns. -A negative @var{delta} means @var{window} shall be shrunk by --@var{delta} columns. - -Optional argument @var{ignore} has the same meaning as for the function -@code{window-resizable} above. - -This function can simultaneously move two edges of WINDOW. Exactly -which edges of @var{window} are moved and which other windows are -resized along with @var{window} is determined by the splits and nest -status of the involved windows (@pxref{Splitting Windows}). If only the -low (right) edge of @var{window} shall be moved, the function -@code{adjust-window-trailing-edge} described below should be used. -@end defun - -The next four commands are simple interfaces to @code{window-resize}. -They always operate on the selected window, never delete any window, and -always raise an error when resizing would violate a restriction imposed -by @code{window-min-height}, @code{window-min-width}, or -@code{window-size-fixed}. - -@deffn Command enlarge-window delta &optional horizontal -This function makes the selected window @var{delta} lines taller. -Interactively, if no argument is given, it makes the selected window one -line taller. If optional argument @var{horizontal} is non-@code{nil}, -it makes the selected window wider by @var{delta} columns. If -@var{delta} is negative, it shrinks the selected window by -@var{delta} -lines or columns. The return value is @code{nil}. -@end deffn +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 +positive @var{delta} means to enlarge the window, and a negative +@var{delta} means to shrink it. -@deffn Command enlarge-window-horizontally delta -This function makes the selected window @var{delta} columns wider. -Interactively, if no argument is given, it makes the selected window one -column wider. -@end deffn +If @var{window} is @code{nil}, it defaults to the selected window. If +the window cannot be resized as demanded, an error is signaled. -@deffn Command shrink-window delta &optional horizontal -This function makes the selected window @var{delta} lines smaller. -Interactively, if no argument is given, it makes the selected window one -line smaller. If optional argument @var{horizontal} is non-@code{nil}, -it makes the selected window narrower by @var{delta} columns. If -@var{delta} is negative, it enlarges the selected window by -@var{delta} -lines or columns. The return value is @code{nil}. -@end deffn +The optional argument @var{ignore} has the same meaning as for the +function @code{window-resizable} above. -@deffn Command shrink-window-horizontally delta -This function makes the selected window @var{delta} columns narrower. -Interactively, if no argument is given, it makes the selected window one -column narrower. -@end deffn +The choice of which window edge this function alters depends on the +splitting and nesting status of the involved windows; in some cases, +it may alter both edges. @xref{Splitting Windows}. To resize by +moving only the bottom or right edge of a window, use the function +@code{adjust-window-trailing-edge}, below. +@end defun + +@c The commands enlarge-window, enlarge-window-horizontally, +@c shrink-window, and shrink-window-horizontally are documented in the +@c Emacs manual. They are not preferred for calling from Lisp. -The following function is useful for moving the line dividing two + The following function is useful for moving the line dividing two windows. @defun adjust-window-trailing-edge window delta &optional horizontal @@ -1101,9 +1037,9 @@ configuration. @code{split-window}. @defopt window-splits -If this variable is nil, the function @code{split-window} can split a -window if and only if that window's screen estate is sufficiently large -to accommodate both--itself and the new window. +If this variable is @code{nil}, the function @code{split-window} can +split a window if and only if that window's screen estate is +sufficiently large to accommodate both--itself and the new window. If this variable is non-@code{nil}, @code{split-window} tries to resize all windows that are part of the same combination as the old window to @@ -1488,11 +1424,11 @@ function, it calls that function with @var{window} as its sole argument. @end deffn @deffn Command delete-windows-on &optional buffer-or-name frame -This function deletes all windows showing @var{buffer-or-name} and -returns nil. If there are no windows showing @var{buffer-or-name}, it -does nothing. The optional argument @var{buffer-or-name} may be a -buffer or the name of an existing buffer and defaults to the current -buffer. Invoking this command on a minibuffer signals an error. +This function deletes all windows showing @var{buffer-or-name}. If +there are no windows showing @var{buffer-or-name}, it does nothing. +The optional argument @var{buffer-or-name} may be a buffer or the name +of an existing buffer and defaults to the current buffer. Invoking +this command on a minibuffer signals an error. The function @code{delete-windows-on} operates by calling @code{delete-window} for each window showing @var{buffer-or-name}. If a @@ -2108,7 +2044,7 @@ The constant @code{display-buffer-fallback-action}. @noindent Each action function is called in turn, passing the buffer as the first argument and the combined action alist as the second argument, -until one of the functions returns non-nil. +until one of the functions returns non-@code{nil}. The argument @var{action} can also have a non-@code{nil}, non-list value. This has the special meaning that the buffer should be @@ -2159,7 +2095,7 @@ returns the window if it succeeds, and @code{nil} if it fails. This function tries to display @var{buffer} in the selected window. It fails if the selected window is a minibuffer window or is dedicated to another buffer (@pxref{Dedicated Windows}). It also fails if -@var{alist} has a non-nil @code{inhibit-same-window} entry. +@var{alist} has a non-@code{nil} @code{inhibit-same-window} entry. @end defun @defun display-buffer-reuse-window buffer alist